update README

add Configuration, Config Location, CLI Flags, Supported Settings,
Example Config, Default Config sections

Makefile

@@ -8,7 +8,7 @@ BINDIR ?= $(PREFIX)/bin
 DESTDIR ?=
 
 CXX ?= g++
-CXXFLAGS ?= -O2 -Wall -Wextra -std=c++17 -pipe
+CXXFLAGS ?= -O2 -Wall -Wextra -std=c++17 -pipe -Ithird_party/toml++/include
 LDFLAGS ?= -static-libstdc++ -static-libgcc
 
 VERSION ?= $(shell git describe --tags --dirty --always 2>/dev/null)

README.md

@@ -11,6 +11,106 @@
 - GPU name resolution via `/usr/share/hwdata/pci.ids` (falls back to hex IDs if missing).
 - Accounts for Unicode character width for better alignment in terminals.
 
+## Configuration
+
+`fetchit` can be configured via a TOML file.
+
+### Config File Location (XDG)
+
+`fetchit` searches for a config file in the following location:
+
+- `$XDG_CONFIG_HOME/fetchit/config.toml`
+- If `XDG_CONFIG_HOME` is not set: `~/.config/fetchit/config.toml`
+
+If the config file is missing, defaults are used (no warning).
+
+If the config file exists but is invalid TOML or has invalid values, `fetchit` prints warnings to `stderr` and continues using built-in defaults.
+
+### Precedence
+
+1. Built-in defaults
+2. Config file
+3. CLI flags (`--config`, `--no-config`)
+
+### CLI Flags
+
+- `-h`, `--help`: show help
+- `-c <path>`, `--config <path>`: use an explicit config path
+- `--no-config`: do not load any config file
+
+### Supported Settings
+
+- `modules = [...]` (array of strings)
+  - Controls module order and visibility.
+  - Supported module names:
+    - `distro`, `kernel`, `uptime`, `shell`, `cpu`, `gpu`, `ram`, `os_date`
+
+- `[logo]`
+  - `enabled = true|false`
+
+- `[labels]` (table)
+  - Per-module label strings.
+  - Icons are part of the label string (e.g. `" distro:"`).
+
+- `[colors]` (table)
+  - Per-module color names (strings).
+  - Supported colors:
+    - `red`, `green`, `blue`, `yellow`, `magenta`, `purple`, `cyan`, `gray`/`grey`, `dark`
+
+### Example `config.toml`
+
+```toml
+modules = ["kernel", "distro", "cpu", "gpu", "ram"]
+
+[logo]
+enabled = true
+
+[labels]
+kernel = " kernel:"
+distro = " distro:"
+cpu = "󰍛 CPU:"
+gpu = "󰾲 GPU:"
+ram = " RAM:"
+
+[colors]
+kernel = "magenta"
+distro = "green"
+cpu = "yellow"
+gpu = "yellow"
+ram = "red"
+```
+
+### Default Config
+
+This is the built-in default configuration (equivalent to running with no config file):
+
+```toml
+modules = ["distro", "kernel", "uptime", "shell", "cpu", "gpu", "ram", "os_date"]
+
+[logo]
+enabled = true
+
+[labels]
+distro  = " distro:"
+kernel  = " kernel:"
+uptime  = " uptime:"
+shell   = " shell:"
+cpu     = "󰍛 CPU:"
+gpu     = "󰾲 GPU:"
+ram     = " RAM:"
+os_date = " OS Date:"
+
+[colors]
+distro  = "green"
+kernel  = "magenta"
+uptime  = "blue"
+shell   = "magenta"
+cpu     = "yellow"
+gpu     = "yellow"
+ram     = "red"
+os_date = "blue"
+```
+
 ## Supported Distro Logos
 
 Logos are matched against `/etc/os-release` `ID`:

main.cpp

@@ -9,12 +9,18 @@
 #include <iomanip>
 #include <unordered_map>
 #include <cctype>
+#include <string_view>
+#include <functional>
+#include <optional>
 #include <sys/utsname.h>
 #include <sys/stat.h>
 #include <ctime>
 #include <clocale>
 #include <cwchar>
 
+// TOML++ (Config parsing)
+#include <toml++/toml.hpp>
+
 using std::string, std::cout, std::vector;
 namespace fs = std::filesystem;
 
@@ -30,6 +36,17 @@ string getGPU();
 string getRAM();
 string getOsDate();
 
+enum class Module {
+    Distro,
+    Kernel,
+    Uptime,
+    Shell,
+    CPU,
+    GPU,
+    RAM,
+    OsDate,
+};
+
 enum class Color {
     Red,
     RedLight,
@@ -57,6 +74,428 @@ enum class Color {
 
 string color(Color c);
 
+struct EnumHash {
+    template <class T>
+    size_t operator()(T v) const noexcept {
+        return static_cast<size_t>(v);
+    }
+};
+
+struct Config {
+    vector<Module> modules;
+    bool logoEnabled = true;
+
+    std::unordered_map<Module, string, EnumHash> labels;
+    std::unordered_map<Module, Color, EnumHash> colors;
+};
+
+struct ModuleSpec {
+    Module id;
+    std::string_view name;
+    string defaultLabel;
+    Color defaultColor;
+    string (*getter)();
+};
+
+static const std::array<ModuleSpec, 8>& moduleSpecs() {
+    static const std::array<ModuleSpec, 8> specs = {
+        ModuleSpec{Module::Distro, "distro", " distro:", Color::Green, &getDistro},
+        ModuleSpec{Module::Kernel, "kernel", " kernel:", Color::Magenta, &getKernel},
+        ModuleSpec{Module::Uptime, "uptime", " uptime:", Color::Blue, &getUptime},
+        ModuleSpec{Module::Shell, "shell", " shell:", Color::Magenta, &getShell},
+        ModuleSpec{Module::CPU, "cpu", "󰍛 CPU:", Color::Yellow, &getCPU},
+        ModuleSpec{Module::GPU, "gpu", "󰾲 GPU:", Color::Yellow, &getGPU},
+        ModuleSpec{Module::RAM, "ram", " RAM:", Color::Red, &getRAM},
+        ModuleSpec{Module::OsDate, "os_date", " OS Date:", Color::Blue, &getOsDate},
+    };
+    return specs;
+}
+
+static const ModuleSpec* findModuleSpec(std::string_view name) {
+    for (const auto& spec : moduleSpecs()) {
+        if (spec.name == name) return &spec;
+    }
+    return nullptr;
+}
+
+static const ModuleSpec* findModuleSpec(Module m) {
+    for (const auto& spec : moduleSpecs()) {
+        if (spec.id == m) return &spec;
+    }
+    return nullptr;
+}
+
+enum class FlagValue {
+    None,
+    Required,
+};
+
+struct FlagSpec {
+    std::string_view longName;
+    char shortName = '\0';
+    FlagValue value = FlagValue::None;
+    std::string_view valueName;
+    std::string_view help;
+    std::function<void(std::string_view)> onValue;
+    std::function<void()> onFlag;
+};
+
+struct ParsedCli {
+    bool showHelp = false;
+    bool noConfig = false;
+    std::optional<fs::path> configPath;
+    vector<string> positionals;
+    vector<string> warnings;
+};
+
+static const FlagSpec* findLongFlag(const vector<FlagSpec>& specs, std::string_view name) {
+    for (const auto& s : specs) {
+        if (s.longName == name) return &s;
+    }
+    return nullptr;
+}
+
+static const FlagSpec* findShortFlag(const vector<FlagSpec>& specs, char name) {
+    for (const auto& s : specs) {
+        if (s.shortName == name && name != '\0') return &s;
+    }
+    return nullptr;
+}
+
+static ParsedCli parseCli(int argc, char** argv, const vector<FlagSpec>& specs) {
+    ParsedCli out;
+    bool onlyPositionals = false;
+
+    for (int i = 1; i < argc; ++i) {
+        std::string_view arg = argv[i] ? argv[i] : "";
+        if (arg.empty()) continue;
+
+        if (!onlyPositionals && arg == "--") {
+            onlyPositionals = true;
+            continue;
+        }
+
+        if (!onlyPositionals && arg.rfind("--", 0) == 0) {
+            std::string_view name = arg.substr(2);
+            std::string_view value;
+            const size_t eq = name.find('=');
+            if (eq != std::string_view::npos) {
+                value = name.substr(eq + 1);
+                name = name.substr(0, eq);
+            }
+
+            const FlagSpec* spec = findLongFlag(specs, name);
+            if (!spec) {
+                out.warnings.push_back("fetchit: warning: unknown option '--" + string(name) + "'; ignoring");
+                continue;
+            }
+
+            if (spec->value == FlagValue::None) {
+                if (!value.empty()) {
+                    out.warnings.push_back("fetchit: warning: option '--" + string(name)
+                                           + "' does not take a value; ignoring value");
+                }
+                if (spec->onFlag) spec->onFlag();
+            } else {
+                if (value.empty()) {
+                    if (i + 1 >= argc) {
+                        out.warnings.push_back("fetchit: warning: option '--" + string(name)
+                                               + "' requires a value; ignoring");
+                        continue;
+                    }
+                    value = argv[++i];
+                }
+                if (spec->onValue) spec->onValue(value);
+            }
+            continue;
+        }
+
+        if (!onlyPositionals && arg.size() >= 2 && arg[0] == '-' && arg[1] != '-') {
+            std::string_view group = arg.substr(1);
+            bool consumedValue = false;
+
+            for (size_t j = 0; j < group.size(); ++j) {
+                const char ch = group[j];
+                const FlagSpec* spec = findShortFlag(specs, ch);
+                if (!spec) {
+                    out.warnings.push_back(string("fetchit: warning: unknown option '-") + ch + "'; ignoring");
+                    continue;
+                }
+
+                if (spec->value == FlagValue::None) {
+                    if (spec->onFlag) spec->onFlag();
+                    continue;
+                }
+
+                std::string_view value = group.substr(j + 1);
+                if (value.empty()) {
+                    if (i + 1 >= argc) {
+                        out.warnings.push_back(string("fetchit: warning: option '-") + ch
+                                               + "' requires a value; ignoring");
+                        break;
+                    }
+                    value = argv[++i];
+                }
+
+                if (spec->onValue) spec->onValue(value);
+                consumedValue = true;
+                break;
+            }
+
+            (void)consumedValue;
+            continue;
+        }
+
+        out.positionals.push_back(string(arg));
+    }
+
+    return out;
+}
+
+static void printHelp(const char* argv0, const vector<FlagSpec>& specs) {
+    const char* prog = (argv0 && *argv0) ? argv0 : "fetchit";
+    std::cout << "Usage: " << prog << " [options]\n\n";
+    std::cout << "Options:\n";
+    for (const auto& s : specs) {
+        std::cout << "  ";
+        bool any = false;
+        if (s.shortName != '\0') {
+            std::cout << "-" << s.shortName;
+            any = true;
+        }
+        if (!s.longName.empty()) {
+            if (any) std::cout << ", ";
+            std::cout << "--" << s.longName;
+            any = true;
+        }
+        if (s.value == FlagValue::Required) {
+            std::cout << " <" << (s.valueName.empty() ? "value" : s.valueName) << ">";
+        }
+        std::cout << "\n";
+        if (!s.help.empty()) {
+            std::cout << "      " << s.help << "\n";
+        }
+    }
+}
+
+Config defaultConfig() {
+    Config cfg;
+
+    cfg.modules.clear();
+    cfg.labels.clear();
+    cfg.colors.clear();
+    cfg.modules.reserve(moduleSpecs().size());
+    for (const auto& spec : moduleSpecs()) {
+        cfg.modules.push_back(spec.id);
+        cfg.labels[spec.id] = spec.defaultLabel;
+        cfg.colors[spec.id] = spec.defaultColor;
+    }
+
+    cfg.logoEnabled = true;
+    return cfg;
+}
+
+static bool getenvNonEmpty(const char* name, string& out) {
+    const char* v = std::getenv(name);
+    if (!v || !*v) return false;
+    out = v;
+    return true;
+}
+
+static fs::path defaultConfigPath() {
+    // XDG base dir spec: $XDG_CONFIG_HOME, fallback to ~/.config.
+    string xdg;
+    if (getenvNonEmpty("XDG_CONFIG_HOME", xdg)) {
+        return fs::path(xdg) / "fetchit" / "config.toml";
+    }
+
+    string home;
+    if (getenvNonEmpty("HOME", home)) {
+        return fs::path(home) / ".config" / "fetchit" / "config.toml";
+    }
+
+    return {};
+}
+
+static bool fileExists(const fs::path& p) {
+    if (p.empty()) return false;
+    std::error_code ec;
+    return fs::exists(p, ec) && !ec;
+}
+
+static fs::path findExistingConfigPath() {
+    const fs::path p = defaultConfigPath();
+    if (fileExists(p)) return p;
+    return {};
+}
+
+static string toLowerAscii(string s) {
+    for (char& c : s) {
+        c = static_cast<char>(std::tolower(static_cast<unsigned char>(c)));
+    }
+    return s;
+}
+
+static bool parseColorName(const string& name, Color& out) {
+    const string n = toLowerAscii(name);
+
+    if (n == "red") {
+        out = Color::Red;
+        return true;
+    }
+    if (n == "green") {
+        out = Color::Green;
+        return true;
+    }
+    if (n == "blue") {
+        out = Color::Blue;
+        return true;
+    }
+    if (n == "yellow") {
+        out = Color::Yellow;
+        return true;
+    }
+    if (n == "magenta") {
+        out = Color::Magenta;
+        return true;
+    }
+    if (n == "purple") {
+        out = Color::Purple;
+        return true;
+    }
+    if (n == "cyan") {
+        out = Color::Cyan;
+        return true;
+    }
+    if (n == "gray" || n == "grey") {
+        out = Color::Gray;
+        return true;
+    }
+    if (n == "dark") {
+        out = Color::Dark;
+        return true;
+    }
+
+    return false;
+}
+
+static Config loadConfigOrDefault(vector<string>& warnings, const std::optional<fs::path>& overridePath, bool noConfig) {
+    warnings.clear();
+    if (noConfig) return defaultConfig();
+
+    fs::path configPath;
+    if (overridePath.has_value()) {
+        configPath = *overridePath;
+        if (!fileExists(configPath)) {
+            warnings.push_back("fetchit: warning: config file not found: " + configPath.string() + "; using defaults");
+            return defaultConfig();
+        }
+    } else {
+        configPath = findExistingConfigPath();
+        if (configPath.empty()) return defaultConfig();
+    }
+
+    Config cfg = defaultConfig();
+
+    toml::table tbl;
+    try {
+        tbl = toml::parse_file(configPath.string());
+    } catch (const toml::parse_error& err) {
+        std::ostringstream oss;
+        oss << "fetchit: warning: invalid config " << configPath.string() << ": " << err << "; using defaults";
+        warnings.push_back(oss.str());
+        return defaultConfig();
+    }
+
+    if (auto modulesArr = tbl["modules"].as_array()) {
+        vector<Module> modules;
+        modules.reserve(modulesArr->size());
+        for (const auto& node : *modulesArr) {
+            const auto* s = node.as_string();
+            if (!s) {
+                warnings.push_back("fetchit: warning: modules[] must be strings; ignoring non-string entry");
+                continue;
+            }
+            const string name = s->get();
+            const ModuleSpec* spec = findModuleSpec(name);
+            if (!spec) {
+                warnings.push_back("fetchit: warning: unknown module '" + name + "'; ignoring");
+                continue;
+            }
+            modules.push_back(spec->id);
+        }
+
+        if (modules.empty()) {
+            warnings.push_back("fetchit: warning: modules list is empty after validation; using defaults");
+        } else {
+            cfg.modules = std::move(modules);
+        }
+    } else if (tbl.contains("modules")) {
+        warnings.push_back("fetchit: warning: modules must be an array of strings; using defaults");
+    }
+
+    // [logo]
+    if (auto logoTbl = tbl["logo"].as_table()) {
+        if (auto enabled = (*logoTbl)["enabled"].value<bool>()) {
+            cfg.logoEnabled = *enabled;
+        } else if (logoTbl->contains("enabled")) {
+            warnings.push_back("fetchit: warning: logo.enabled must be a boolean; using default");
+        }
+    } else if (tbl.contains("logo")) {
+        warnings.push_back("fetchit: warning: logo must be a table; ignoring");
+    }
+
+    // [labels]
+    if (auto labelsTbl = tbl["labels"].as_table()) {
+        for (auto&& [k, v] : *labelsTbl) {
+            const string key = string(k.str());
+            const ModuleSpec* spec = findModuleSpec(key);
+            if (!spec) {
+                warnings.push_back("fetchit: warning: unknown labels key '" + key + "'; ignoring");
+                continue;
+            }
+            auto* s = v.as_string();
+            if (!s) {
+                warnings.push_back("fetchit: warning: labels." + key + " must be a string; ignoring");
+                continue;
+            }
+            cfg.labels[spec->id] = s->get();
+        }
+    } else if (tbl.contains("labels")) {
+        warnings.push_back("fetchit: warning: labels must be a table; ignoring");
+    }
+
+    // [colors]
+    if (auto colorsTbl = tbl["colors"].as_table()) {
+        for (auto&& [k, v] : *colorsTbl) {
+            const string key = string(k.str());
+            const ModuleSpec* spec = findModuleSpec(key);
+            if (!spec) {
+                warnings.push_back("fetchit: warning: unknown colors key '" + key + "'; ignoring");
+                continue;
+            }
+            auto* s = v.as_string();
+            if (!s) {
+                warnings.push_back("fetchit: warning: colors." + key + " must be a string; ignoring");
+                continue;
+            }
+
+            Color c;
+            const string colorName = s->get();
+            if (!parseColorName(colorName, c)) {
+                warnings.push_back("fetchit: warning: unknown color name '" + colorName + "' for colors." + key
+                                   + "; ignoring");
+                continue;
+            }
+            cfg.colors[spec->id] = c;
+        }
+    } else if (tbl.contains("colors")) {
+        warnings.push_back("fetchit: warning: colors must be a table; ignoring");
+    }
+
+    return cfg;
+}
+
 struct DistroLogo {
     string id;
     Color color;
@@ -88,9 +527,59 @@ vector<gpuId> getGpuIds() {
     return gpus;
 }
 
-int main () {
+int main (int argc, char** argv) {
     std::setlocale(LC_ALL, "");
 
+    ParsedCli cliState;
+    const vector<FlagSpec> flagSpecs = {
+        FlagSpec{
+            .longName = "help",
+            .shortName = 'h',
+            .value = FlagValue::None,
+            .valueName = {},
+            .help = "Show this help message",
+            .onValue = {},
+            .onFlag = [&]() { cliState.showHelp = true; },
+        },
+        FlagSpec{
+            .longName = "config",
+            .shortName = 'c',
+            .value = FlagValue::Required,
+            .valueName = "path",
+            .help = "Use an explicit config file path",
+            .onValue = [&](std::string_view v) { cliState.configPath = fs::path(string(v)); },
+            .onFlag = {},
+        },
+        FlagSpec{
+            .longName = "no-config",
+            .shortName = '\0',
+            .value = FlagValue::None,
+            .valueName = {},
+            .help = "Do not load any config file",
+            .onValue = {},
+            .onFlag = [&]() { cliState.noConfig = true; },
+        },
+    };
+
+    ParsedCli cli = parseCli(argc, argv, flagSpecs);
+    cliState.warnings.insert(cliState.warnings.end(), cli.warnings.begin(), cli.warnings.end());
+    cliState.positionals = std::move(cli.positionals);
+
+    if (cliState.showHelp) {
+        printHelp(argv && argv[0] ? argv[0] : "fetchit", flagSpecs);
+        return 0;
+    }
+
+    for (const auto& w : cliState.warnings) {
+        std::cerr << w << "\n";
+    }
+
+    vector<string> configWarnings;
+    const Config config = loadConfigOrDefault(configWarnings, cliState.configPath, cliState.noConfig);
+    for (const auto& w : configWarnings) {
+        std::cerr << w << "\n";
+    }
+
     auto displayWidth = [&](const string& text) {
         std::mbstate_t state{};
         const char* src = text.c_str();
@@ -123,18 +612,26 @@ int main () {
         return color(c) + padded + color(Color::Reset) + value;
     };
 
-    vector<string> infoLines = {
+    vector<string> infoLines;
-        formatLine(Color::Green, " distro:", getDistro()),
+    infoLines.reserve(config.modules.size());
-        formatLine(Color::Magenta, " kernel:", getKernel()),
+    for (Module m : config.modules) {
-        formatLine(Color::Blue, " uptime:", getUptime()),
+        const ModuleSpec* spec = findModuleSpec(m);
-        formatLine(Color::Magenta, " shell:", getShell()),
+        if (!spec) continue;
-        formatLine(Color::Yellow, "󰍛 CPU:", getCPU()),
-        formatLine(Color::Yellow, "󰾲 GPU:", getGPU()),
-        formatLine(Color::Red, " RAM:", getRAM()),
-        formatLine(Color::Blue, " OS Date:", getOsDate())
-    };
 
-    vector<string> logoLines = distroArt();
+        auto labelIt = config.labels.find(m);
+        const string& label = (labelIt != config.labels.end()) ? labelIt->second : spec->defaultLabel;
+
+        auto colorIt = config.colors.find(m);
+        const Color c = (colorIt != config.colors.end()) ? colorIt->second : spec->defaultColor;
+
+        const string value = spec->getter ? spec->getter() : string{};
+        infoLines.push_back(formatLine(c, label, value));
+    }
+
+    vector<string> logoLines;
+    if (config.logoEnabled) {
+        logoLines = distroArt();
+    }
     size_t logoWidth = 0;
     for (const auto& line : logoLines) {
         if (line.size() > logoWidth) logoWidth = line.size();
@@ -683,8 +1180,6 @@ string getRAM() {
         return "";
     }
 
-    //
-
     int memkbs = 0;
     string line;
     while (std::getline(readRAM, line)) {

third_party/toml++/LICENSE

@@ -0,0 +1,16 @@
+MIT License
+
+Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

third_party/toml++/VERSION

@@ -0,0 +1 @@
+v3.4.0

third_party/toml++/include/toml++/impl/array.inl

@@ -0,0 +1,382 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+//# {{
+#include "preprocessor.hpp"
+#if !TOML_IMPLEMENTATION
+#error This is an implementation-only header.
+#endif
+//# }}
+
+#include "array.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	TOML_EXTERNAL_LINKAGE
+	array::array() noexcept
+	{
+#if TOML_LIFETIME_HOOKS
+		TOML_ARRAY_CREATED;
+#endif
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	array::~array() noexcept
+	{
+#if TOML_LIFETIME_HOOKS
+		TOML_ARRAY_DESTROYED;
+#endif
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	array::array(const impl::array_init_elem* b, const impl::array_init_elem* e)
+	{
+#if TOML_LIFETIME_HOOKS
+		TOML_ARRAY_CREATED;
+#endif
+
+		TOML_ASSERT_ASSUME(b);
+		TOML_ASSERT_ASSUME(e);
+		TOML_ASSERT_ASSUME(b <= e);
+
+		if TOML_UNLIKELY(b == e)
+			return;
+
+		size_t cap{};
+		for (auto it = b; it != e; it++)
+		{
+			if (it->value)
+				cap++;
+		}
+		if TOML_UNLIKELY(!cap)
+			return;
+
+		elems_.reserve(cap);
+		for (; b != e; b++)
+		{
+			if (b->value)
+				elems_.push_back(std::move(b->value));
+		}
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	array::array(const array& other) //
+		: node(other)
+	{
+		elems_.reserve(other.elems_.size());
+		for (const auto& elem : other)
+			elems_.emplace_back(impl::make_node(elem));
+
+#if TOML_LIFETIME_HOOKS
+		TOML_ARRAY_CREATED;
+#endif
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	array::array(array && other) noexcept //
+		: node(std::move(other)),
+		  elems_(std::move(other.elems_))
+	{
+#if TOML_LIFETIME_HOOKS
+		TOML_ARRAY_CREATED;
+#endif
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	array& array::operator=(const array& rhs)
+	{
+		if (&rhs != this)
+		{
+			node::operator=(rhs);
+			elems_.clear();
+			elems_.reserve(rhs.elems_.size());
+			for (const auto& elem : rhs)
+				elems_.emplace_back(impl::make_node(elem));
+		}
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	array& array::operator=(array&& rhs) noexcept
+	{
+		if (&rhs != this)
+		{
+			node::operator=(std::move(rhs));
+			elems_ = std::move(rhs.elems_);
+		}
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void array::preinsertion_resize(size_t idx, size_t count)
+	{
+		TOML_ASSERT(idx <= elems_.size());
+		TOML_ASSERT_ASSUME(count >= 1u);
+		const auto old_size			= elems_.size();
+		const auto new_size			= old_size + count;
+		const auto inserting_at_end = idx == old_size;
+		elems_.resize(new_size);
+		if (!inserting_at_end)
+		{
+			for (size_t left = old_size, right = new_size - 1u; left-- > idx; right--)
+				elems_[right] = std::move(elems_[left]);
+		}
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void array::insert_at_back(impl::node_ptr && elem)
+	{
+		TOML_ASSERT(elem);
+		elems_.push_back(std::move(elem));
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	array::vector_iterator array::insert_at(const_vector_iterator pos, impl::node_ptr && elem)
+	{
+		return elems_.insert(pos, std::move(elem));
+	}
+
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	bool array::is_homogeneous(node_type ntype) const noexcept
+	{
+		if (elems_.empty())
+			return false;
+
+		if (ntype == node_type::none)
+			ntype = elems_[0]->type();
+
+		for (const auto& val : elems_)
+			if (val->type() != ntype)
+				return false;
+
+		return true;
+	}
+
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	bool array::is_homogeneous(node_type ntype, node * &first_nonmatch) noexcept
+	{
+		if (elems_.empty())
+		{
+			first_nonmatch = {};
+			return false;
+		}
+		if (ntype == node_type::none)
+			ntype = elems_[0]->type();
+		for (const auto& val : elems_)
+		{
+			if (val->type() != ntype)
+			{
+				first_nonmatch = val.get();
+				return false;
+			}
+		}
+		return true;
+	}
+
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	bool array::is_homogeneous(node_type ntype, const node*& first_nonmatch) const noexcept
+	{
+		node* fnm		  = nullptr;
+		const auto result = const_cast<array&>(*this).is_homogeneous(ntype, fnm);
+		first_nonmatch	  = fnm;
+		return result;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	node& array::at(size_t index)
+	{
+#if TOML_COMPILER_HAS_EXCEPTIONS
+
+		return *elems_.at(index);
+
+#else
+
+		auto n = get(index);
+		TOML_ASSERT_ASSUME(n && "element index not found in array!");
+		return *n;
+
+#endif
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void array::reserve(size_t new_capacity)
+	{
+		elems_.reserve(new_capacity);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void array::shrink_to_fit()
+	{
+		elems_.shrink_to_fit();
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void array::truncate(size_t new_size)
+	{
+		if (new_size < elems_.size())
+			elems_.resize(new_size);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	array::iterator array::erase(const_iterator pos) noexcept
+	{
+		return iterator{ elems_.erase(const_vector_iterator{ pos }) };
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	array::iterator array::erase(const_iterator first, const_iterator last) noexcept
+	{
+		return iterator{ elems_.erase(const_vector_iterator{ first }, const_vector_iterator{ last }) };
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	size_t array::total_leaf_count() const noexcept
+	{
+		size_t leaves{};
+		for (size_t i = 0, e = elems_.size(); i < e; i++)
+		{
+			auto arr = elems_[i]->as_array();
+			leaves += arr ? arr->total_leaf_count() : size_t{ 1 };
+		}
+		return leaves;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void array::flatten_child(array && child, size_t & dest_index) noexcept
+	{
+		for (size_t i = 0, e = child.size(); i < e; i++)
+		{
+			auto type = child.elems_[i]->type();
+			if (type == node_type::array)
+			{
+				array& arr = *reinterpret_cast<array*>(child.elems_[i].get());
+				if (!arr.empty())
+					flatten_child(std::move(arr), dest_index);
+			}
+			else
+				elems_[dest_index++] = std::move(child.elems_[i]);
+		}
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	array& array::flatten()&
+	{
+		if (elems_.empty())
+			return *this;
+
+		bool requires_flattening	 = false;
+		size_t size_after_flattening = elems_.size();
+		for (size_t i = elems_.size(); i-- > 0u;)
+		{
+			auto arr = elems_[i]->as_array();
+			if (!arr)
+				continue;
+			size_after_flattening--; // discount the array itself
+			const auto leaf_count = arr->total_leaf_count();
+			if (leaf_count > 0u)
+			{
+				requires_flattening = true;
+				size_after_flattening += leaf_count;
+			}
+			else
+				elems_.erase(elems_.cbegin() + static_cast<ptrdiff_t>(i));
+		}
+
+		if (!requires_flattening)
+			return *this;
+
+		elems_.reserve(size_after_flattening);
+
+		size_t i = 0;
+		while (i < elems_.size())
+		{
+			auto arr = elems_[i]->as_array();
+			if (!arr)
+			{
+				i++;
+				continue;
+			}
+
+			impl::node_ptr arr_storage = std::move(elems_[i]);
+			const auto leaf_count	   = arr->total_leaf_count();
+			if (leaf_count > 1u)
+				preinsertion_resize(i + 1u, leaf_count - 1u);
+			flatten_child(std::move(*arr), i); // increments i
+		}
+
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	array& array::prune(bool recursive)& noexcept
+	{
+		if (elems_.empty())
+			return *this;
+
+		for (size_t i = elems_.size(); i-- > 0u;)
+		{
+			if (auto arr = elems_[i]->as_array())
+			{
+				if (recursive)
+					arr->prune(true);
+				if (arr->empty())
+					elems_.erase(elems_.cbegin() + static_cast<ptrdiff_t>(i));
+			}
+			else if (auto tbl = elems_[i]->as_table())
+			{
+				if (recursive)
+					tbl->prune(true);
+				if (tbl->empty())
+					elems_.erase(elems_.cbegin() + static_cast<ptrdiff_t>(i));
+			}
+		}
+
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void array::pop_back() noexcept
+	{
+		elems_.pop_back();
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void array::clear() noexcept
+	{
+		elems_.clear();
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	bool TOML_CALLCONV array::equal(const array& lhs, const array& rhs) noexcept
+	{
+		if (&lhs == &rhs)
+			return true;
+		if (lhs.elems_.size() != rhs.elems_.size())
+			return false;
+		for (size_t i = 0, e = lhs.elems_.size(); i < e; i++)
+		{
+			const auto lhs_type = lhs.elems_[i]->type();
+			const node& rhs_	= *rhs.elems_[i];
+			const auto rhs_type = rhs_.type();
+			if (lhs_type != rhs_type)
+				return false;
+
+			const bool equal = lhs.elems_[i]->visit(
+				[&](const auto& lhs_) noexcept
+				{ return lhs_ == *reinterpret_cast<std::remove_reference_t<decltype(lhs_)>*>(&rhs_); });
+			if (!equal)
+				return false;
+		}
+		return true;
+	}
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/at_path.hpp

@@ -0,0 +1,97 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "forward_declarations.hpp"
+
+/// \cond
+TOML_IMPL_NAMESPACE_START
+{
+	template <typename T>
+	using parse_path_callback = bool(TOML_CALLCONV*)(void*, T);
+
+	TOML_NODISCARD
+	bool TOML_CALLCONV parse_path(std::string_view,
+								  void*,
+								  parse_path_callback<std::string_view>,
+								  parse_path_callback<size_t>);
+}
+TOML_IMPL_NAMESPACE_END;
+/// \endcond
+
+TOML_NAMESPACE_START
+{
+	/// \brief Returns a view of the node matching a fully-qualified "TOML path".
+	///
+	/// \detail \cpp
+	/// auto config = toml::parse(R"(
+	///
+	/// [foo]
+	/// bar = [ 0, 1, 2, [ 3 ], { kek = 4 } ]
+	///
+	/// )"sv);
+	///
+	/// std::cout << toml::at_path(config, "foo.bar[2]") << "\n";
+	/// std::cout << toml::at_path(config, "foo.bar[3][0]") << "\n";
+	/// std::cout << toml::at_path(config, "foo.bar[4].kek") << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// 2
+	/// 3
+	/// 4
+	/// \eout
+	///
+	///
+	/// \note Keys in paths are interpreted literally, so whitespace (or lack thereof) matters:
+	/// \cpp
+	/// toml::at_path(config, "foo.bar")  // same as config["foo"]["bar"]
+	/// toml::at_path(config, "foo. bar") // same as config["foo"][" bar"]
+	/// toml::at_path(config, "foo..bar") // same as config["foo"][""]["bar"]
+	/// toml::at_path(config, ".foo.bar") // same as config[""]["foo"]["bar"]
+	/// \ecpp
+	/// <br>
+	/// Additionally, TOML allows '.' (period) characters to appear in keys if they are quoted strings.
+	/// This function makes no allowance for this, instead treating all period characters as sub-table delimiters.
+	/// If you have periods in your table keys, first consider:
+	/// 1. Not doing that
+	/// 2. Using node_view::operator[] instead.
+	///
+	/// \param root		The root node from which the path will be traversed.
+	/// \param path		The "TOML path" to traverse.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	node_view<node> TOML_CALLCONV at_path(node & root, std::string_view path) noexcept;
+
+	/// \brief Returns a const view of the node matching a fully-qualified "TOML path".
+	///
+	/// \see #toml::at_path(node&, std::string_view)
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	node_view<const node> TOML_CALLCONV at_path(const node& root, std::string_view path) noexcept;
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+	/// \brief Returns a view of the node matching a fully-qualified "TOML path".
+	///
+	/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+	///
+	/// \see #toml::at_path(node&, std::string_view)
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	node_view<node> TOML_CALLCONV at_path(node & root, std::wstring_view path);
+
+	/// \brief Returns a const view of the node matching a fully-qualified "TOML path".
+	///
+	/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+	///
+	/// \see #toml::at_path(node&, std::string_view)
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	node_view<const node> TOML_CALLCONV at_path(const node& root, std::wstring_view path);
+
+#endif
+}
+TOML_NAMESPACE_END;

third_party/toml++/include/toml++/impl/at_path.inl

@@ -0,0 +1,290 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+//# {{
+#include "preprocessor.hpp"
+#if !TOML_IMPLEMENTATION
+#error This is an implementation-only header.
+#endif
+//# }}
+
+#include "at_path.hpp"
+#include "array.hpp"
+#include "table.hpp"
+TOML_DISABLE_WARNINGS;
+#if TOML_INT_CHARCONV
+#include <charconv>
+#else
+#include <sstream>
+#endif
+TOML_ENABLE_WARNINGS;
+#include "header_start.hpp"
+
+TOML_IMPL_NAMESPACE_START
+{
+	TOML_EXTERNAL_LINKAGE
+	bool TOML_CALLCONV parse_path(const std::string_view path,
+								  void* const data,
+								  const parse_path_callback<std::string_view> on_key,
+								  const parse_path_callback<size_t> on_index)
+	{
+		// a blank string is a valid path; it's just one component representing the "" key
+		if (path.empty())
+			return on_key(data, ""sv);
+
+		size_t pos					= 0;
+		const auto end				= path.length();
+		bool prev_was_array_indexer = false;
+		bool prev_was_dot			= true; // invisible root 'dot'
+
+		while (pos < end)
+		{
+			// start of an array indexer
+			if (path[pos] == '[')
+			{
+				// find first digit in index
+				size_t index_start = pos + 1u;
+				while (true)
+				{
+					if TOML_UNLIKELY(index_start >= path.length())
+						return false;
+
+					const auto c = path[index_start];
+					if TOML_LIKELY(c >= '0' && c <= '9')
+						break;
+					else if (c == ' ' || c == '\t')
+						index_start++;
+					else
+						return false;
+				}
+				TOML_ASSERT(path[index_start] >= '0');
+				TOML_ASSERT(path[index_start] <= '9');
+
+				// find end of index (first non-digit character)
+				size_t index_end = index_start + 1u;
+				while (true)
+				{
+					// if an array indexer is missing the trailing ']' at the end of the string, permissively accept it
+					if TOML_UNLIKELY(index_end >= path.length())
+						break;
+
+					const auto c = path[index_end];
+					if (c >= '0' && c <= '9')
+						index_end++;
+					else if (c == ']' || c == ' ' || c == '\t' || c == '.' || c == '[')
+						break;
+					else
+						return false;
+				}
+				TOML_ASSERT(path[index_end - 1u] >= '0');
+				TOML_ASSERT(path[index_end - 1u] <= '9');
+
+				// move pos to after indexer (char after closing ']' or permissively EOL/subkey '.'/next opening '[')
+				pos = index_end;
+				while (true)
+				{
+					if TOML_UNLIKELY(pos >= path.length())
+						break;
+
+					const auto c = path[pos];
+					if (c == ']')
+					{
+						pos++;
+						break;
+					}
+					else if TOML_UNLIKELY(c == '.' || c == '[')
+						break;
+					else if (c == '\t' || c == ' ')
+						pos++;
+					else
+						return false;
+				}
+
+				// get array index substring
+				auto index_str = path.substr(index_start, index_end - index_start);
+
+				// parse the actual array index to an integer type
+				size_t index;
+				if (index_str.length() == 1u)
+					index = static_cast<size_t>(index_str[0] - '0');
+				else
+				{
+#if TOML_INT_CHARCONV
+
+					auto fc_result = std::from_chars(index_str.data(), index_str.data() + index_str.length(), index);
+					if (fc_result.ec != std::errc{})
+						return false;
+
+#else
+
+					std::stringstream ss;
+					ss.imbue(std::locale::classic());
+					ss.write(index_str.data(), static_cast<std::streamsize>(index_str.length()));
+					if (!(ss >> index))
+						return false;
+
+#endif
+				}
+
+				prev_was_dot		   = false;
+				prev_was_array_indexer = true;
+
+				if (!on_index(data, index))
+					return false;
+			}
+
+			// start of a new table child
+			else if (path[pos] == '.')
+			{
+				// a dot immediately following another dot (or at the beginning of the string) is as if we'd asked
+				// for an empty child in between, e.g.
+				//
+				//     foo..bar
+				//
+				// is equivalent to
+				//
+				//     "foo".""."bar"
+				//
+				if (prev_was_dot && !on_key(data, ""sv))
+					return false;
+
+				pos++;
+				prev_was_dot		   = true;
+				prev_was_array_indexer = false;
+			}
+
+			// an errant closing ']'
+			else if TOML_UNLIKELY(path[pos] == ']')
+				return false;
+
+			// some regular subkey
+			else
+			{
+				const auto subkey_start = pos;
+				const auto subkey_len =
+					impl::min(path.find_first_of(".[]"sv, subkey_start + 1u), path.length()) - subkey_start;
+				const auto subkey = path.substr(subkey_start, subkey_len);
+
+				// a regular subkey segment immediately after an array indexer is OK if it was all whitespace, e.g.:
+				//
+				//     "foo[0]  .bar"
+				//            ^^ skip this
+				//
+				// otherwise its an error (since it would have to be preceeded by a dot)
+				if (prev_was_array_indexer)
+				{
+					auto non_ws = subkey.find_first_not_of(" \t");
+					if (non_ws == std::string_view::npos)
+					{
+						pos += subkey_len;
+						prev_was_dot		   = false;
+						prev_was_array_indexer = false;
+						continue;
+					}
+					else
+						return false;
+				}
+
+				pos += subkey_len;
+				prev_was_dot		   = false;
+				prev_was_array_indexer = false;
+
+				if (!on_key(data, subkey))
+					return false;
+			}
+		}
+
+		// Last character was a '.', which implies an empty string key at the end of the path
+		if (prev_was_dot && !on_key(data, ""sv))
+			return false;
+
+		return true;
+	}
+}
+TOML_IMPL_NAMESPACE_END;
+
+TOML_NAMESPACE_START
+{
+	TOML_EXTERNAL_LINKAGE
+	node_view<node> TOML_CALLCONV at_path(node & root, std::string_view path) noexcept
+	{
+		// early-exit sanity-checks
+		if (root.is_value())
+			return {};
+		if (auto tbl = root.as_table(); tbl && tbl->empty())
+			return {};
+		if (auto arr = root.as_array(); arr && arr->empty())
+			return {};
+
+		node* current = &root;
+
+		static constexpr auto on_key = [](void* data, std::string_view key) noexcept -> bool
+		{
+			auto& curr = *static_cast<node**>(data);
+			TOML_ASSERT_ASSUME(curr);
+
+			const auto current_table = curr->as<table>();
+			if (!current_table)
+				return false;
+
+			curr = current_table->get(key);
+			return curr != nullptr;
+		};
+
+		static constexpr auto on_index = [](void* data, size_t index) noexcept -> bool
+		{
+			auto& curr = *static_cast<node**>(data);
+			TOML_ASSERT_ASSUME(curr);
+
+			const auto current_array = curr->as<array>();
+			if (!current_array)
+				return false;
+
+			curr = current_array->get(index);
+			return curr != nullptr;
+		};
+
+		if (!impl::parse_path(path, &current, on_key, on_index))
+			current = nullptr;
+
+		return node_view{ current };
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	node_view<const node> TOML_CALLCONV at_path(const node& root, std::string_view path) noexcept
+	{
+		return node_view<const node>{ at_path(const_cast<node&>(root), path).node() };
+	}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+	TOML_EXTERNAL_LINKAGE
+	node_view<node> TOML_CALLCONV at_path(node & root, std::wstring_view path)
+	{
+		// these are the same top-level checks from the narrow-string version;
+		// they're hoisted up here to avoid doing the wide -> narrow conversion where it would not be necessary
+		// (avoids an allocation)
+		if (root.is_value())
+			return {};
+		if (auto tbl = root.as_table(); tbl && tbl->empty())
+			return {};
+		if (auto arr = root.as_array(); arr && arr->empty())
+			return {};
+
+		return at_path(root, impl::narrow(path));
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	node_view<const node> TOML_CALLCONV at_path(const node& root, std::wstring_view path)
+	{
+		return node_view<const node>{ at_path(const_cast<node&>(root), path).node() };
+	}
+
+#endif // TOML_ENABLE_WINDOWS_COMPAT
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/date_time.hpp

@@ -0,0 +1,468 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "forward_declarations.hpp"
+#include "print_to_stream.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	/// \brief	A local date.
+	struct TOML_TRIVIAL_ABI date
+	{
+		/// \brief	The year component.
+		uint16_t year;
+
+		/// \brief	The month component, from 1 - 12.
+		uint8_t month;
+
+		/// \brief	The day component, from 1 - 31.
+		uint8_t day;
+
+		/// \brief Default constructor. Does not initialize the members.
+		TOML_NODISCARD_CTOR
+		date() noexcept = default;
+
+		/// \brief Constructs a date from individual date component values.
+		TOML_CONSTRAINED_TEMPLATE((impl::all_integral<Y, M, D>), typename Y, typename M, typename D)
+		TOML_NODISCARD_CTOR
+		constexpr date(Y y, M m, D d) noexcept //
+			: year{ static_cast<uint16_t>(y) },
+			  month{ static_cast<uint8_t>(m) },
+			  day{ static_cast<uint8_t>(d) }
+		{}
+
+		/// \brief	Equality operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator==(const date& lhs, const date& rhs) noexcept
+		{
+			return lhs.year == rhs.year	  //
+				&& lhs.month == rhs.month //
+				&& lhs.day == rhs.day;
+		}
+
+		/// \brief	Inequality operator.
+		TOML_PURE_INLINE_GETTER
+		friend constexpr bool operator!=(const date& lhs, const date& rhs) noexcept
+		{
+			return !(lhs == rhs);
+		}
+
+	  private:
+		/// \cond
+
+		TOML_PURE_GETTER
+		static constexpr uint32_t pack(const date& d) noexcept
+		{
+			return (static_cast<uint32_t>(d.year) << 16) | (static_cast<uint32_t>(d.month) << 8)
+				 | static_cast<uint32_t>(d.day);
+		}
+
+		/// \endcond
+
+	  public:
+		/// \brief	Less-than operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator<(const date& lhs, const date& rhs) noexcept
+		{
+			return pack(lhs) < pack(rhs);
+		}
+
+		/// \brief	Less-than-or-equal-to operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator<=(const date& lhs, const date& rhs) noexcept
+		{
+			return pack(lhs) <= pack(rhs);
+		}
+
+		/// \brief	Greater-than operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator>(const date& lhs, const date& rhs) noexcept
+		{
+			return pack(lhs) > pack(rhs);
+		}
+
+		/// \brief	Greater-than-or-equal-to operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator>=(const date& lhs, const date& rhs) noexcept
+		{
+			return pack(lhs) >= pack(rhs);
+		}
+
+		/// \brief	Prints a date out to a stream as `YYYY-MM-DD` (per RFC 3339).
+		///
+		/// \detail \cpp
+		/// std::cout << toml::date{ 1987, 3, 16 } << "\n";
+		/// \ecpp
+		///
+		/// \out
+		/// 1987-03-16
+		/// \eout
+		friend std::ostream& operator<<(std::ostream& lhs, const date& rhs)
+		{
+			impl::print_to_stream(lhs, rhs);
+			return lhs;
+		}
+	};
+
+	/// \brief	A local time-of-day.
+	struct TOML_TRIVIAL_ABI time
+	{
+		/// \brief	The hour component, from 0 - 23.
+		uint8_t hour;
+
+		/// \brief	The minute component, from 0 - 59.
+		uint8_t minute;
+
+		/// \brief	The second component, from 0 - 59.
+		uint8_t second;
+
+		/// \brief	The fractional nanoseconds component, from 0 - 999999999.
+		uint32_t nanosecond;
+
+		/// \brief Default constructor. Does not initialize the members.
+		TOML_NODISCARD_CTOR
+		time() noexcept = default;
+
+		/// \brief Constructs a time from individual time component values.
+		TOML_CONSTRAINED_TEMPLATE((impl::all_integral<H, M, S, NS>),
+								  typename H,
+								  typename M,
+								  typename S  = uint8_t,
+								  typename NS = uint32_t)
+		TOML_NODISCARD_CTOR
+		constexpr time(H h, M m, S s = S{}, NS ns = NS{}) noexcept //
+			: hour{ static_cast<uint8_t>(h) },
+			  minute{ static_cast<uint8_t>(m) },
+			  second{ static_cast<uint8_t>(s) },
+			  nanosecond{ static_cast<uint32_t>(ns) }
+		{}
+
+		/// \brief	Equality operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator==(const time& lhs, const time& rhs) noexcept
+		{
+			return lhs.hour == rhs.hour		//
+				&& lhs.minute == rhs.minute //
+				&& lhs.second == rhs.second //
+				&& lhs.nanosecond == rhs.nanosecond;
+		}
+
+		/// \brief	Inequality operator.
+		TOML_PURE_INLINE_GETTER
+		friend constexpr bool operator!=(const time& lhs, const time& rhs) noexcept
+		{
+			return !(lhs == rhs);
+		}
+
+	  private:
+		/// \cond
+
+		TOML_PURE_GETTER
+		static constexpr uint64_t pack(const time& t) noexcept
+		{
+			return static_cast<uint64_t>(t.hour) << 48 | static_cast<uint64_t>(t.minute) << 40
+				 | static_cast<uint64_t>(t.second) << 32 | static_cast<uint64_t>(t.nanosecond);
+		}
+
+		/// \endcond
+
+	  public:
+		/// \brief	Less-than operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator<(const time& lhs, const time& rhs) noexcept
+		{
+			return pack(lhs) < pack(rhs);
+		}
+
+		/// \brief	Less-than-or-equal-to operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator<=(const time& lhs, const time& rhs) noexcept
+		{
+			return pack(lhs) <= pack(rhs);
+		}
+
+		/// \brief	Greater-than operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator>(const time& lhs, const time& rhs) noexcept
+		{
+			return pack(lhs) > pack(rhs);
+		}
+
+		/// \brief	Greater-than-or-equal-to operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator>=(const time& lhs, const time& rhs) noexcept
+		{
+			return pack(lhs) >= pack(rhs);
+		}
+
+		/// \brief	Prints a time out to a stream as `HH:MM:SS.FFFFFF` (per RFC 3339).
+		/// \detail \cpp
+		/// std::cout << toml::time{ 10, 20, 34 } << "\n";
+		/// std::cout << toml::time{ 10, 20, 34, 500000000 } << "\n";
+		/// \ecpp
+		///
+		/// \out
+		/// 10:20:34
+		/// 10:20:34.5
+		/// \eout
+		friend std::ostream& operator<<(std::ostream& lhs, const time& rhs)
+		{
+			impl::print_to_stream(lhs, rhs);
+			return lhs;
+		}
+	};
+
+	/// \brief	A timezone offset.
+	struct TOML_TRIVIAL_ABI time_offset
+	{
+		/// \brief	Offset from UTC+0, in minutes.
+		int16_t minutes;
+
+		/// \brief	Default constructor. Does not initialize the members.
+		TOML_NODISCARD_CTOR
+		time_offset() noexcept = default;
+
+		/// \brief	Constructs a timezone offset from individual hour and minute totals.
+		///
+		/// \detail \cpp
+		/// std::cout << toml::time_offset{ 2, 30 } << "\n";
+		/// std::cout << toml::time_offset{ -2, 30 } << "\n";
+		/// std::cout << toml::time_offset{ -2, -30 } << "\n";
+		/// std::cout << toml::time_offset{ 0, 0 } << "\n";
+		/// \ecpp
+		///
+		/// \out
+		/// +02:30
+		/// -01:30
+		/// -02:30
+		/// Z
+		/// \eout
+		///
+		/// \tparam H	An integral type.
+		/// \tparam M	An integral type.
+		///
+		/// \param 	h  	The total hours.
+		/// \param 	m	The total minutes.
+		TOML_CONSTRAINED_TEMPLATE((impl::all_integral<H, M>), typename H, typename M)
+		TOML_NODISCARD_CTOR
+		constexpr time_offset(H h, M m) noexcept //
+			: minutes{ static_cast<int16_t>(static_cast<impl::common_signed_type<H, M>>(h)
+												* impl::common_signed_type<H, M>{ 60 }
+											+ static_cast<impl::common_signed_type<H, M>>(m)) }
+		{}
+
+		/// \brief	Equality operator.
+		TOML_PURE_INLINE_GETTER
+		friend constexpr bool operator==(time_offset lhs, time_offset rhs) noexcept
+		{
+			return lhs.minutes == rhs.minutes;
+		}
+
+		/// \brief	Inequality operator.
+		TOML_PURE_INLINE_GETTER
+		friend constexpr bool operator!=(time_offset lhs, time_offset rhs) noexcept
+		{
+			return lhs.minutes != rhs.minutes;
+		}
+
+		/// \brief	Less-than operator.
+		TOML_PURE_INLINE_GETTER
+		friend constexpr bool operator<(time_offset lhs, time_offset rhs) noexcept
+		{
+			return lhs.minutes < rhs.minutes;
+		}
+
+		/// \brief	Less-than-or-equal-to operator.
+		TOML_PURE_INLINE_GETTER
+		friend constexpr bool operator<=(time_offset lhs, time_offset rhs) noexcept
+		{
+			return lhs.minutes <= rhs.minutes;
+		}
+
+		/// \brief	Greater-than operator.
+		TOML_PURE_INLINE_GETTER
+		friend constexpr bool operator>(time_offset lhs, time_offset rhs) noexcept
+		{
+			return lhs.minutes > rhs.minutes;
+		}
+
+		/// \brief	Greater-than-or-equal-to operator.
+		TOML_PURE_INLINE_GETTER
+		friend constexpr bool operator>=(time_offset lhs, time_offset rhs) noexcept
+		{
+			return lhs.minutes >= rhs.minutes;
+		}
+
+		/// \brief	Prints a time_offset out to a stream as `+-HH:MM or Z` (per RFC 3339).
+		/// \detail \cpp
+		/// std::cout << toml::time_offset{ 2, 30 } << "\n";
+		/// std::cout << toml::time_offset{ 2, -30 } << "\n";
+		/// std::cout << toml::time_offset{} << "\n";
+		/// std::cout << toml::time_offset{ -2, 30 } << "\n";
+		/// std::cout << toml::time_offset{ -2, -30 } << "\n";
+		/// \ecpp
+		///
+		/// \out
+		/// +02:30
+		/// +01:30
+		/// Z
+		/// -01:30
+		/// -02:30
+		/// \eout
+		friend std::ostream& operator<<(std::ostream& lhs, const time_offset& rhs)
+		{
+			impl::print_to_stream(lhs, rhs);
+			return lhs;
+		}
+	};
+
+	TOML_ABI_NAMESPACE_BOOL(TOML_HAS_CUSTOM_OPTIONAL_TYPE, custopt, stdopt);
+
+	/// \brief	A date-time.
+	struct date_time
+	{
+		/// \brief	The date component.
+		toml::date date;
+
+		/// \brief	The time component.
+		toml::time time;
+
+		/// \brief	The timezone offset component.
+		///
+		/// \remarks The date_time is said to be 'local' if the offset is empty.
+		optional<toml::time_offset> offset;
+
+		/// \brief	Default constructor. Does not initialize the members.
+		TOML_NODISCARD_CTOR
+		date_time() noexcept = default;
+
+		/// \brief	Constructs a local date-time.
+		///
+		/// \param 	d	The date component.
+		/// \param 	t	The time component.
+		TOML_NODISCARD_CTOR
+		constexpr date_time(const toml::date& d, const toml::time& t) noexcept //
+			: date{ d },
+			  time{ t },
+			  offset{} // TINAE - icc bugfix
+		{}
+
+		/// \brief	Constructs a local date-time.
+		///
+		/// \param 	d	The date component.
+		TOML_NODISCARD_CTOR
+		explicit constexpr date_time(const toml::date& d) noexcept //
+			: date{ d },
+			  time{},
+			  offset{} // TINAE - icc bugfix
+		{}
+
+		/// \brief	Constructs a local date-time.
+		///
+		/// \param 	t	The time component.
+		TOML_NODISCARD_CTOR
+		explicit constexpr date_time(const toml::time& t) noexcept //
+			: date{},
+			  time{ t },
+			  offset{} // TINAE - icc bugfix
+		{}
+
+		/// \brief	Constructs an offset date-time.
+		///
+		/// \param 	d	  	The date component.
+		/// \param 	t	  	The time component.
+		/// \param 	off	The timezone offset.
+		TOML_NODISCARD_CTOR
+		constexpr date_time(const toml::date& d, const toml::time& t, const toml::time_offset& off) noexcept
+			: date{ d },
+			  time{ t },
+			  offset{ off }
+		{}
+
+		/// \brief	Returns true if this date_time does not contain timezone offset information.
+		TOML_PURE_INLINE_GETTER
+		constexpr bool is_local() const noexcept
+		{
+			return !offset.has_value();
+		}
+
+		/// \brief	Equality operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator==(const date_time& lhs, const date_time& rhs) noexcept
+		{
+			return lhs.date == rhs.date //
+				&& lhs.time == rhs.time //
+				&& lhs.offset == rhs.offset;
+		}
+
+		/// \brief	Inequality operator.
+		TOML_PURE_INLINE_GETTER
+		friend constexpr bool operator!=(const date_time& lhs, const date_time& rhs) noexcept
+		{
+			return !(lhs == rhs);
+		}
+
+		/// \brief	Less-than operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator<(const date_time& lhs, const date_time& rhs) noexcept
+		{
+			if (lhs.date != rhs.date)
+				return lhs.date < rhs.date;
+			if (lhs.time != rhs.time)
+				return lhs.time < rhs.time;
+			return lhs.offset < rhs.offset;
+		}
+
+		/// \brief	Less-than-or-equal-to operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator<=(const date_time& lhs, const date_time& rhs) noexcept
+		{
+			if (lhs.date != rhs.date)
+				return lhs.date < rhs.date;
+			if (lhs.time != rhs.time)
+				return lhs.time < rhs.time;
+			return lhs.offset <= rhs.offset;
+		}
+
+		/// \brief	Greater-than operator.
+		TOML_PURE_INLINE_GETTER
+		friend constexpr bool operator>(const date_time& lhs, const date_time& rhs) noexcept
+		{
+			return !(lhs <= rhs);
+		}
+
+		/// \brief	Greater-than-or-equal-to operator.
+		TOML_PURE_INLINE_GETTER
+		friend constexpr bool operator>=(const date_time& lhs, const date_time& rhs) noexcept
+		{
+			return !(lhs < rhs);
+		}
+
+		/// \brief	Prints a date_time out to a stream in RFC 3339 format.
+		/// \detail \cpp
+		/// std::cout << toml::date_time{ { 1987, 3, 16 }, { 10, 20, 34 } } << "\n";
+		/// std::cout << toml::date_time{ { 1987, 3, 16 }, { 10, 20, 34 }, { -2, -30 } } << "\n";
+		/// std::cout << toml::date_time{ { 1987, 3, 16 }, { 10, 20, 34 }, {} } << "\n";
+		/// \ecpp
+		///
+		/// \out
+		/// 1987-03-16T10:20:34
+		/// 1987-03-16T10:20:34-02:30
+		/// 1987-03-16T10:20:34Z
+		/// \eout
+		friend std::ostream& operator<<(std::ostream& lhs, const date_time& rhs)
+		{
+			impl::print_to_stream(lhs, rhs);
+			return lhs;
+		}
+	};
+
+	TOML_ABI_NAMESPACE_END; // TOML_HAS_CUSTOM_OPTIONAL_TYPE
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/formatter.hpp

@@ -0,0 +1,194 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+#if TOML_ENABLE_FORMATTERS
+
+#include "forward_declarations.hpp"
+#include "print_to_stream.hpp"
+#include "header_start.hpp"
+/// \cond
+
+TOML_IMPL_NAMESPACE_START
+{
+	struct formatter_constants
+	{
+		format_flags mandatory_flags;
+		format_flags ignored_flags;
+
+		std::string_view float_pos_inf;
+		std::string_view float_neg_inf;
+		std::string_view float_nan;
+
+		std::string_view bool_true;
+		std::string_view bool_false;
+	};
+
+	struct formatter_config
+	{
+		format_flags flags;
+		std::string_view indent;
+	};
+
+	class TOML_EXPORTED_CLASS formatter
+	{
+	  private:
+		const node* source_;
+#if TOML_ENABLE_PARSER && !TOML_EXCEPTIONS
+		const parse_result* result_;
+#endif
+		const formatter_constants* constants_;
+		formatter_config config_;
+		size_t indent_columns_;
+		format_flags int_format_mask_;
+		std::ostream* stream_; //
+		int indent_;		   // these are set in attach()
+		bool naked_newline_;   //
+
+	  protected:
+		TOML_PURE_INLINE_GETTER
+		const node& source() const noexcept
+		{
+			return *source_;
+		}
+
+		TOML_PURE_INLINE_GETTER
+		std::ostream& stream() const noexcept
+		{
+			return *stream_;
+		}
+
+		TOML_PURE_INLINE_GETTER
+		int indent() const noexcept
+		{
+			return indent_;
+		}
+
+		void indent(int level) noexcept
+		{
+			indent_ = level;
+		}
+
+		void increase_indent() noexcept
+		{
+			indent_++;
+		}
+
+		void decrease_indent() noexcept
+		{
+			indent_--;
+		}
+
+		TOML_PURE_INLINE_GETTER
+		size_t indent_columns() const noexcept
+		{
+			return indent_columns_;
+		}
+
+		TOML_PURE_INLINE_GETTER
+		bool indent_array_elements() const noexcept
+		{
+			return !!(config_.flags & format_flags::indent_array_elements);
+		}
+
+		TOML_PURE_INLINE_GETTER
+		bool indent_sub_tables() const noexcept
+		{
+			return !!(config_.flags & format_flags::indent_sub_tables);
+		}
+
+		TOML_PURE_INLINE_GETTER
+		bool literal_strings_allowed() const noexcept
+		{
+			return !!(config_.flags & format_flags::allow_literal_strings);
+		}
+
+		TOML_PURE_INLINE_GETTER
+		bool multi_line_strings_allowed() const noexcept
+		{
+			return !!(config_.flags & format_flags::allow_multi_line_strings);
+		}
+
+		TOML_PURE_INLINE_GETTER
+		bool real_tabs_in_strings_allowed() const noexcept
+		{
+			return !!(config_.flags & format_flags::allow_real_tabs_in_strings);
+		}
+
+		TOML_PURE_INLINE_GETTER
+		bool unicode_strings_allowed() const noexcept
+		{
+			return !!(config_.flags & format_flags::allow_unicode_strings);
+		}
+
+		TOML_PURE_INLINE_GETTER
+		bool terse_kvps() const noexcept
+		{
+			return !!(config_.flags & format_flags::terse_key_value_pairs);
+		}
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void attach(std::ostream& stream) noexcept;
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void detach() noexcept;
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print_newline(bool force = false);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print_indent();
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print_unformatted(char);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print_unformatted(std::string_view);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print_string(std::string_view str,
+						  bool allow_multi_line			= true,
+						  bool allow_bare				= false,
+						  bool allow_literal_whitespace = true);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const value<std::string>&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const value<int64_t>&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const value<double>&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const value<bool>&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const value<date>&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const value<time>&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const value<date_time>&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print_value(const node&, node_type);
+
+		TOML_NODISCARD
+		TOML_EXPORTED_MEMBER_FUNCTION
+		bool dump_failed_parse_result();
+
+		TOML_NODISCARD_CTOR
+		TOML_EXPORTED_MEMBER_FUNCTION
+		formatter(const node*, const parse_result*, const formatter_constants&, const formatter_config&) noexcept;
+	};
+}
+TOML_IMPL_NAMESPACE_END;
+
+/// \endcond
+#include "header_end.hpp"
+#endif // TOML_ENABLE_FORMATTERS

third_party/toml++/include/toml++/impl/formatter.inl

@@ -0,0 +1,523 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+//# {{
+#if !TOML_IMPLEMENTATION
+#error This is an implementation-only header.
+#endif
+//# }}
+#if TOML_ENABLE_FORMATTERS
+
+#include "formatter.hpp"
+#include "print_to_stream.hpp"
+#include "value.hpp"
+#include "table.hpp"
+#include "array.hpp"
+#include "unicode.hpp"
+#include "parse_result.hpp"
+#include "header_start.hpp"
+
+TOML_IMPL_NAMESPACE_START
+{
+	enum class TOML_CLOSED_FLAGS_ENUM formatted_string_traits : unsigned
+	{
+		none,
+		line_breaks	  = 1u << 0, // \n
+		tabs		  = 1u << 1, // \t
+		control_chars = 1u << 2, // also includes non-ascii vertical whitespace
+		single_quotes = 1u << 3,
+		non_bare	  = 1u << 4, // anything not satisfying "is bare key character"
+		non_ascii	  = 1u << 5, // any codepoint >= 128
+
+		all = (non_ascii << 1u) - 1u
+	};
+	TOML_MAKE_FLAGS(formatted_string_traits);
+
+	TOML_EXTERNAL_LINKAGE
+	formatter::formatter(const node* source_node,
+						 const parse_result* source_pr,
+						 const formatter_constants& constants,
+						 const formatter_config& config) noexcept //
+#if TOML_ENABLE_PARSER && !TOML_EXCEPTIONS
+		: source_{ source_pr && *source_pr ? &source_pr->table() : source_node },
+		  result_{ source_pr },
+#else
+		: source_{ source_pr ? source_pr : source_node },
+#endif
+		  constants_{ &constants },
+		  config_{ config }
+	{
+		TOML_ASSERT_ASSUME(source_);
+
+		config_.flags = (config_.flags | constants_->mandatory_flags) & ~constants_->ignored_flags;
+
+		indent_columns_ = {};
+		for (auto c : config_.indent)
+			indent_columns_ += c == '\t' ? 4u : 1u;
+
+		int_format_mask_ = config_.flags
+						 & (format_flags::allow_binary_integers | format_flags::allow_octal_integers
+							| format_flags::allow_hexadecimal_integers);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::attach(std::ostream & stream) noexcept
+	{
+		indent_		   = {};
+		naked_newline_ = true;
+		stream_		   = &stream;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::detach() noexcept
+	{
+		stream_ = nullptr;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::print_newline(bool force)
+	{
+		if (!naked_newline_ || force)
+		{
+			print_to_stream(*stream_, '\n');
+			naked_newline_ = true;
+		}
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::print_indent()
+	{
+		for (int i = 0; i < indent_; i++)
+		{
+			print_to_stream(*stream_, config_.indent);
+			naked_newline_ = false;
+		}
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::print_unformatted(char c)
+	{
+		print_to_stream(*stream_, c);
+		naked_newline_ = false;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::print_unformatted(std::string_view str)
+	{
+		print_to_stream(*stream_, str);
+		naked_newline_ = false;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::print_string(std::string_view str,
+								 bool allow_multi_line,
+								 bool allow_bare,
+								 bool allow_literal_whitespace)
+	{
+		if (str.empty())
+		{
+			print_unformatted(literal_strings_allowed() ? "''"sv : "\"\""sv);
+			return;
+		}
+
+		// pre-scan the string to determine how we should output it
+		formatted_string_traits traits = {};
+
+		if (!allow_bare)
+			traits |= formatted_string_traits::non_bare;
+		bool unicode_allowed = unicode_strings_allowed();
+
+		// ascii fast path
+		if (is_ascii(str.data(), str.length()))
+		{
+			for (auto c : str)
+			{
+				switch (c)
+				{
+					case '\n': traits |= formatted_string_traits::line_breaks; break;
+					case '\t': traits |= formatted_string_traits::tabs; break;
+					case '\'': traits |= formatted_string_traits::single_quotes; break;
+					default:
+					{
+						if TOML_UNLIKELY(is_control_character(c))
+							traits |= formatted_string_traits::control_chars;
+
+						if (!is_ascii_bare_key_character(static_cast<char32_t>(c)))
+							traits |= formatted_string_traits::non_bare;
+						break;
+					}
+				}
+
+				static constexpr auto all_ascii_traits =
+					formatted_string_traits::all & ~formatted_string_traits::non_ascii;
+				if (traits == all_ascii_traits)
+					break;
+			}
+		}
+
+		// unicode slow path
+		else
+		{
+			traits |= formatted_string_traits::non_ascii;
+			utf8_decoder decoder;
+
+			// if the unicode is malformed just treat the string as a single-line non-literal and
+			// escape all non-ascii characters (to ensure round-tripping and help with diagnostics)
+			const auto bad_unicode = [&]() noexcept
+			{
+				traits &= ~formatted_string_traits::line_breaks;
+				traits |= formatted_string_traits::control_chars | formatted_string_traits::non_bare;
+				unicode_allowed = false;
+			};
+
+			for (auto c : str)
+			{
+				decoder(c);
+
+				if TOML_UNLIKELY(decoder.error())
+				{
+					bad_unicode();
+					break;
+				}
+
+				if (!decoder.has_code_point())
+					continue;
+
+				switch (decoder.codepoint)
+				{
+					case U'\n': traits |= formatted_string_traits::line_breaks; break;
+					case U'\t': traits |= formatted_string_traits::tabs; break;
+					case U'\'': traits |= formatted_string_traits::single_quotes; break;
+					default:
+					{
+						if TOML_UNLIKELY(is_control_character(decoder.codepoint)
+							|| is_non_ascii_vertical_whitespace(decoder.codepoint))
+							traits |= formatted_string_traits::control_chars;
+
+						if (!is_bare_key_character(decoder.codepoint))
+							traits |= formatted_string_traits::non_bare;
+						break;
+					}
+				}
+			}
+
+			if (decoder.needs_more_input())
+				bad_unicode();
+		}
+
+		// strings with line breaks, tabs, and single-quotes can't be bare
+		if (!!(traits
+			   & (formatted_string_traits::line_breaks | formatted_string_traits::tabs
+				  | formatted_string_traits::single_quotes)))
+			traits |= formatted_string_traits::non_bare;
+
+		// if the string meets the requirements of being 'bare' we can emit a bare string
+		// (bare strings are composed of letters and numbers; no whitespace, control chars, quotes, etc)
+		if (!(traits & formatted_string_traits::non_bare)
+			&& (!(traits & formatted_string_traits::non_ascii) || unicode_allowed))
+		{
+			print_unformatted(str);
+			return;
+		}
+		const auto real_tabs_allowed = allow_literal_whitespace && real_tabs_in_strings_allowed();
+
+		// determine if this should be a multi-line string (triple-quotes)
+		const auto multi_line = allow_literal_whitespace	 //
+							 && allow_multi_line			 //
+							 && multi_line_strings_allowed() //
+							 && !!(traits & formatted_string_traits::line_breaks);
+
+		// determine if this should be a literal string (single-quotes with no escaping)
+		const auto literal = literal_strings_allowed()											//
+						  && !(traits & formatted_string_traits::control_chars)					//
+						  && (!(traits & formatted_string_traits::single_quotes) || multi_line) //
+						  && (!(traits & formatted_string_traits::tabs) || real_tabs_allowed)	//
+						  && (!(traits & formatted_string_traits::line_breaks) || multi_line)	//
+						  && (!(traits & formatted_string_traits::non_ascii) || unicode_allowed);
+
+		// literal strings (single quotes, no escape codes)
+		if (literal)
+		{
+			const auto quot = multi_line ? R"(''')"sv : R"(')"sv;
+			print_unformatted(quot);
+			print_unformatted(str);
+			print_unformatted(quot);
+			return;
+		}
+
+		// anything from here down is a non-literal string, so requires iteration and escaping.
+		print_unformatted(multi_line ? R"(""")"sv : R"(")"sv);
+
+		// ascii fast path
+		if (!(traits & formatted_string_traits::non_ascii))
+		{
+			for (auto c : str)
+			{
+				switch (c)
+				{
+					case '"': print_to_stream(*stream_, R"(\")"sv); break;
+					case '\\': print_to_stream(*stream_, R"(\\)"sv); break;
+					case '\x7F': print_to_stream(*stream_, R"(\u007F)"sv); break;
+					case '\t': print_to_stream(*stream_, real_tabs_allowed ? "\t"sv : R"(\t)"sv); break;
+					case '\n': print_to_stream(*stream_, multi_line ? "\n"sv : R"(\n)"sv); break;
+					default:
+					{
+						// control characters from lookup table
+						if TOML_UNLIKELY(c >= '\x00' && c <= '\x1F')
+							print_to_stream(*stream_, control_char_escapes[c]);
+
+						// regular characters
+						else
+							print_to_stream(*stream_, c);
+					}
+				}
+			}
+		}
+
+		// unicode slow path
+		else
+		{
+			utf8_decoder decoder;
+			const char* cp_start = str.data();
+			const char* cp_end	 = cp_start;
+			for (auto c : str)
+			{
+				decoder(c);
+				cp_end++;
+
+				// if the decoder encounters malformed unicode just emit raw bytes and
+				if (decoder.error())
+				{
+					while (cp_start != cp_end)
+					{
+						print_to_stream(*stream_, R"(\u00)"sv);
+						print_to_stream(*stream_,
+										static_cast<uint8_t>(*cp_start),
+										value_flags::format_as_hexadecimal,
+										2);
+						cp_start++;
+					}
+					decoder.reset();
+					continue;
+				}
+
+				if (!decoder.has_code_point())
+					continue;
+
+				switch (decoder.codepoint)
+				{
+					case U'"': print_to_stream(*stream_, R"(\")"sv); break;
+					case U'\\': print_to_stream(*stream_, R"(\\)"sv); break;
+					case U'\x7F': print_to_stream(*stream_, R"(\u007F)"sv); break;
+					case U'\t': print_to_stream(*stream_, real_tabs_allowed ? "\t"sv : R"(\t)"sv); break;
+					case U'\n': print_to_stream(*stream_, multi_line ? "\n"sv : R"(\n)"sv); break;
+					default:
+					{
+						// control characters from lookup table
+						if TOML_UNLIKELY(decoder.codepoint <= U'\x1F')
+							print_to_stream(*stream_,
+											control_char_escapes[static_cast<uint_least32_t>(decoder.codepoint)]);
+
+						// escaped unicode characters
+						else if (decoder.codepoint > U'\x7F'
+								 && (!unicode_allowed || is_non_ascii_vertical_whitespace(decoder.codepoint)))
+						{
+							if (static_cast<uint_least32_t>(decoder.codepoint) > 0xFFFFu)
+							{
+								print_to_stream(*stream_, R"(\U)"sv);
+								print_to_stream(*stream_,
+												static_cast<uint_least32_t>(decoder.codepoint),
+												value_flags::format_as_hexadecimal,
+												8);
+							}
+							else
+							{
+								print_to_stream(*stream_, R"(\u)"sv);
+								print_to_stream(*stream_,
+												static_cast<uint_least32_t>(decoder.codepoint),
+												value_flags::format_as_hexadecimal,
+												4);
+							}
+						}
+
+						// regular characters
+						else
+							print_to_stream(*stream_, cp_start, static_cast<size_t>(cp_end - cp_start));
+					}
+				}
+
+				cp_start = cp_end;
+			}
+		}
+
+		print_unformatted(multi_line ? R"(""")"sv : R"(")"sv);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::print(const value<std::string>& val)
+	{
+		print_string(val.get());
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::print(const value<int64_t>& val)
+	{
+		naked_newline_ = false;
+
+		if (*val >= 0 && !!int_format_mask_)
+		{
+			static constexpr auto value_flags_mask =
+				value_flags::format_as_binary | value_flags::format_as_octal | value_flags::format_as_hexadecimal;
+
+			const auto fmt = val.flags() & value_flags_mask;
+			switch (fmt)
+			{
+				case value_flags::format_as_binary:
+					if (!!(int_format_mask_ & format_flags::allow_binary_integers))
+					{
+						print_to_stream(*stream_, "0b"sv);
+						print_to_stream(*stream_, *val, fmt);
+						return;
+					}
+					break;
+
+				case value_flags::format_as_octal:
+					if (!!(int_format_mask_ & format_flags::allow_octal_integers))
+					{
+						print_to_stream(*stream_, "0o"sv);
+						print_to_stream(*stream_, *val, fmt);
+						return;
+					}
+					break;
+
+				case value_flags::format_as_hexadecimal:
+					if (!!(int_format_mask_ & format_flags::allow_hexadecimal_integers))
+					{
+						print_to_stream(*stream_, "0x"sv);
+						print_to_stream(*stream_, *val, fmt);
+						return;
+					}
+					break;
+
+				default: break;
+			}
+		}
+
+		// fallback to decimal
+		print_to_stream(*stream_, *val);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::print(const value<double>& val)
+	{
+		const std::string_view* inf_nan = nullptr;
+		switch (fpclassify(*val))
+		{
+			case fp_class::neg_inf: inf_nan = &constants_->float_neg_inf; break;
+			case fp_class::pos_inf: inf_nan = &constants_->float_pos_inf; break;
+			case fp_class::nan: inf_nan = &constants_->float_nan; break;
+			case fp_class::ok:
+				print_to_stream(*stream_,
+								*val,
+								value_flags::none,
+								!!(config_.flags & format_flags::relaxed_float_precision));
+				break;
+			default: TOML_UNREACHABLE;
+		}
+
+		if (inf_nan)
+		{
+			if (!!(config_.flags & format_flags::quote_infinities_and_nans))
+				print_to_stream_bookended(*stream_, *inf_nan, '"');
+			else
+				print_to_stream(*stream_, *inf_nan);
+		}
+
+		naked_newline_ = false;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::print(const value<bool>& val)
+	{
+		print_unformatted(*val ? constants_->bool_true : constants_->bool_false);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::print(const value<date>& val)
+	{
+		if (!!(config_.flags & format_flags::quote_dates_and_times))
+			print_to_stream_bookended(*stream_, *val, literal_strings_allowed() ? '\'' : '"');
+		else
+			print_to_stream(*stream_, *val);
+		naked_newline_ = false;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::print(const value<time>& val)
+	{
+		if (!!(config_.flags & format_flags::quote_dates_and_times))
+			print_to_stream_bookended(*stream_, *val, literal_strings_allowed() ? '\'' : '"');
+		else
+			print_to_stream(*stream_, *val);
+		naked_newline_ = false;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::print(const value<date_time>& val)
+	{
+		if (!!(config_.flags & format_flags::quote_dates_and_times))
+			print_to_stream_bookended(*stream_, *val, literal_strings_allowed() ? '\'' : '"');
+		else
+			print_to_stream(*stream_, *val);
+		naked_newline_ = false;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void formatter::print_value(const node& val_node, node_type type)
+	{
+		TOML_ASSUME(type > node_type::array);
+		switch (type)
+		{
+			case node_type::string: print(*reinterpret_cast<const value<std::string>*>(&val_node)); break;
+			case node_type::integer: print(*reinterpret_cast<const value<int64_t>*>(&val_node)); break;
+			case node_type::floating_point: print(*reinterpret_cast<const value<double>*>(&val_node)); break;
+			case node_type::boolean: print(*reinterpret_cast<const value<bool>*>(&val_node)); break;
+			case node_type::date: print(*reinterpret_cast<const value<date>*>(&val_node)); break;
+			case node_type::time: print(*reinterpret_cast<const value<time>*>(&val_node)); break;
+			case node_type::date_time: print(*reinterpret_cast<const value<date_time>*>(&val_node)); break;
+			default: TOML_UNREACHABLE;
+		}
+	}
+
+#if TOML_ENABLE_PARSER && !TOML_EXCEPTIONS
+
+	TOML_EXTERNAL_LINKAGE
+	bool formatter::dump_failed_parse_result()
+	{
+		if (result_ && !(*result_))
+		{
+			stream() << result_->error();
+			return true;
+		}
+		return false;
+	}
+
+#else
+
+	TOML_EXTERNAL_LINKAGE
+	TOML_ATTR(const)
+	bool formatter::dump_failed_parse_result()
+	{
+		return false;
+	}
+
+#endif
+}
+TOML_IMPL_NAMESPACE_END;
+
+#include "header_end.hpp"
+#endif // TOML_ENABLE_FORMATTERS

third_party/toml++/include/toml++/impl/header_end.hpp

@@ -0,0 +1,13 @@
+//# {{
+#ifdef __INTELLISENSE__
+#include "preprocessor.hpp"
+#endif
+//# }}
+#ifdef _MSC_VER
+#pragma pop_macro("min")
+#pragma pop_macro("max")
+#ifndef __clang__
+#pragma inline_recursion(off)
+#endif
+#endif
+TOML_POP_WARNINGS;

third_party/toml++/include/toml++/impl/header_start.hpp

@@ -0,0 +1,15 @@
+//# {{
+#ifdef __INTELLISENSE__
+#include "preprocessor.hpp"
+#endif
+//# }}
+TOML_PUSH_WARNINGS;
+#ifdef _MSC_VER
+#ifndef __clang__
+#pragma inline_recursion(on)
+#endif
+#pragma push_macro("min")
+#pragma push_macro("max")
+#undef min
+#undef max
+#endif

third_party/toml++/include/toml++/impl/json_formatter.hpp

@@ -0,0 +1,142 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+#if TOML_ENABLE_FORMATTERS
+
+#include "formatter.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	/// \brief	A wrapper for printing TOML objects out to a stream as formatted JSON.
+	///
+	/// \availability This class is only available when #TOML_ENABLE_FORMATTERS is enabled.
+	///
+	/// \detail \cpp
+	/// auto some_toml = toml::parse(R"(
+	///		[fruit]
+	///		apple.color = "red"
+	///		apple.taste.sweet = true
+	///
+	///		[fruit.apple.texture]
+	///		smooth = true
+	/// )"sv);
+	///	std::cout << toml::json_formatter{ some_toml } << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// {
+	///     "fruit" : {
+	///         "apple" : {
+	///             "color" : "red",
+	///             "taste" : {
+	///                 "sweet" : true
+	///             },
+	///             "texture" : {
+	///                 "smooth" : true
+	///             }
+	///         }
+	///     }
+	/// }
+	/// \eout
+	class TOML_EXPORTED_CLASS json_formatter : impl::formatter
+	{
+	  private:
+		/// \cond
+
+		using base = impl::formatter;
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const toml::table&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const toml::array&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print();
+
+		static constexpr impl::formatter_constants constants = {
+			format_flags::quote_dates_and_times,										  // mandatory
+			format_flags::allow_literal_strings | format_flags::allow_multi_line_strings, // ignored
+			"Infinity"sv,
+			"-Infinity"sv,
+			"NaN"sv,
+			"true"sv,
+			"false"sv
+		};
+
+		/// \endcond
+
+	  public:
+		/// \brief	The default flags for a json_formatter.
+		static constexpr format_flags default_flags = constants.mandatory_flags				  //
+													| format_flags::quote_infinities_and_nans //
+													| format_flags::allow_unicode_strings	  //
+													| format_flags::indentation;
+
+		/// \brief	Constructs a JSON formatter and binds it to a TOML object.
+		///
+		/// \param 	source	The source TOML object.
+		/// \param 	flags 	Format option flags.
+		TOML_NODISCARD_CTOR
+		explicit json_formatter(const toml::node& source, format_flags flags = default_flags) noexcept
+			: base{ &source, nullptr, constants, { flags, "    "sv } }
+		{}
+
+#if TOML_DOXYGEN || (TOML_ENABLE_PARSER && !TOML_EXCEPTIONS)
+
+		/// \brief	Constructs a JSON formatter and binds it to a toml::parse_result.
+		///
+		/// \availability This constructor is only available when exceptions are disabled.
+		///
+		/// \attention Formatting a failed parse result will simply dump the error message out as-is.
+		///		This will not be valid JSON, but at least gives you something to log or show up in diagnostics:
+		/// \cpp
+		/// std::cout << toml::json_formatter{ toml::parse("a = 'b'"sv) } // ok
+		///           << "\n\n"
+		///           << toml::json_formatter{ toml::parse("a = "sv) } // malformed
+		///           << "\n";
+		/// \ecpp
+		/// \out
+		/// {
+		///     "a" : "b"
+		/// }
+		///
+		/// Error while parsing key-value pair: encountered end-of-file
+		///         (error occurred at line 1, column 5)
+		/// \eout
+		/// Use the library with exceptions if you want to avoid this scenario.
+		///
+		/// \param 	result	The parse result.
+		/// \param 	flags 	Format option flags.
+		TOML_NODISCARD_CTOR
+		explicit json_formatter(const toml::parse_result& result, format_flags flags = default_flags) noexcept
+			: base{ nullptr, &result, constants, { flags, "    "sv } }
+		{}
+
+#endif
+
+		/// \brief	Prints the bound TOML object out to the stream as JSON.
+		friend std::ostream& operator<<(std::ostream& lhs, json_formatter& rhs)
+		{
+			rhs.attach(lhs);
+			rhs.print();
+			rhs.detach();
+			return lhs;
+		}
+
+		/// \brief	Prints the bound TOML object out to the stream as JSON (rvalue overload).
+		friend std::ostream& operator<<(std::ostream& lhs, json_formatter&& rhs)
+		{
+			return lhs << rhs; // as lvalue
+		}
+	};
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"
+#endif // TOML_ENABLE_FORMATTERS

third_party/toml++/include/toml++/impl/json_formatter.inl

@@ -0,0 +1,121 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+//# {{
+#if !TOML_IMPLEMENTATION
+#error This is an implementation-only header.
+#endif
+//# }}
+#if TOML_ENABLE_FORMATTERS
+
+#include "json_formatter.hpp"
+#include "print_to_stream.hpp"
+#include "table.hpp"
+#include "array.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	TOML_EXTERNAL_LINKAGE
+	void json_formatter::print(const toml::table& tbl)
+	{
+		if (tbl.empty())
+		{
+			print_unformatted("{}"sv);
+			return;
+		}
+
+		print_unformatted('{');
+
+		if (indent_sub_tables())
+			increase_indent();
+		bool first = false;
+		for (auto&& [k, v] : tbl)
+		{
+			if (first)
+				print_unformatted(',');
+			first = true;
+			print_newline(true);
+			print_indent();
+
+			print_string(k.str(), false);
+			if (terse_kvps())
+				print_unformatted(":"sv);
+			else
+				print_unformatted(" : "sv);
+
+			const auto type = v.type();
+			TOML_ASSUME(type != node_type::none);
+			switch (type)
+			{
+				case node_type::table: print(*reinterpret_cast<const table*>(&v)); break;
+				case node_type::array: print(*reinterpret_cast<const array*>(&v)); break;
+				default: print_value(v, type);
+			}
+		}
+		if (indent_sub_tables())
+			decrease_indent();
+		print_newline(true);
+		print_indent();
+
+		print_unformatted('}');
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void json_formatter::print(const toml::array& arr)
+	{
+		if (arr.empty())
+		{
+			print_unformatted("[]"sv);
+			return;
+		}
+
+		print_unformatted('[');
+		if (indent_array_elements())
+			increase_indent();
+		for (size_t i = 0; i < arr.size(); i++)
+		{
+			if (i > 0u)
+				print_unformatted(',');
+			print_newline(true);
+			print_indent();
+
+			auto& v			= arr[i];
+			const auto type = v.type();
+			TOML_ASSUME(type != node_type::none);
+			switch (type)
+			{
+				case node_type::table: print(*reinterpret_cast<const table*>(&v)); break;
+				case node_type::array: print(*reinterpret_cast<const array*>(&v)); break;
+				default: print_value(v, type);
+			}
+		}
+		if (indent_array_elements())
+			decrease_indent();
+		print_newline(true);
+		print_indent();
+		print_unformatted(']');
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void json_formatter::print()
+	{
+		if (dump_failed_parse_result())
+			return;
+
+		switch (auto source_type = source().type())
+		{
+			case node_type::table: print(*reinterpret_cast<const table*>(&source())); break;
+			case node_type::array: print(*reinterpret_cast<const array*>(&source())); break;
+			default: print_value(source(), source_type);
+		}
+	}
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"
+#endif // TOML_ENABLE_FORMATTERS

third_party/toml++/include/toml++/impl/key.hpp

@@ -0,0 +1,335 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "source_region.hpp"
+#include "std_utility.hpp"
+#include "print_to_stream.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	/// \brief A key parsed from a TOML document.
+	///
+	/// \detail These are used as the internal keys for a toml::table: \cpp
+	/// const toml::table tbl = R"(
+	///     a = 1
+	///       b = 2
+	///         c = 3
+	/// )"_toml;
+	///
+	/// for (auto&& [k, v] : tbl)
+	/// 	std::cout << "key '"sv << k << "' defined at "sv << k.source() << "\n";
+	/// \ecpp
+	/// \out
+	/// key 'a' defined at line 2, column 5
+	/// key 'b' defined at line 3, column 7
+	/// key 'c' defined at line 4, column 9
+	/// \eout
+	class key
+	{
+	  private:
+		std::string key_;
+		source_region source_;
+
+	  public:
+		/// \brief	Default constructor.
+		TOML_NODISCARD_CTOR
+		key() noexcept = default;
+
+		/// \brief	Constructs a key from a string view and source region.
+		TOML_NODISCARD_CTOR
+		explicit key(std::string_view k, source_region&& src = {}) //
+			: key_{ k },
+			  source_{ std::move(src) }
+		{}
+
+		/// \brief	Constructs a key from a string view and source region.
+		TOML_NODISCARD_CTOR
+		explicit key(std::string_view k, const source_region& src) //
+			: key_{ k },
+			  source_{ src }
+		{}
+
+		/// \brief	Constructs a key from a string and source region.
+		TOML_NODISCARD_CTOR
+		explicit key(std::string&& k, source_region&& src = {}) noexcept //
+			: key_{ std::move(k) },
+			  source_{ std::move(src) }
+		{}
+
+		/// \brief	Constructs a key from a string and source region.
+		TOML_NODISCARD_CTOR
+		explicit key(std::string&& k, const source_region& src) noexcept //
+			: key_{ std::move(k) },
+			  source_{ src }
+		{}
+
+		/// \brief	Constructs a key from a c-string and source region.
+		TOML_NODISCARD_CTOR
+		explicit key(const char* k, source_region&& src = {}) //
+			: key_{ k },
+			  source_{ std::move(src) }
+		{}
+
+		/// \brief	Constructs a key from a c-string view and source region.
+		TOML_NODISCARD_CTOR
+		explicit key(const char* k, const source_region& src) //
+			: key_{ k },
+			  source_{ src }
+		{}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief	Constructs a key from a wide string view and source region.
+		///
+		/// \availability This constructor is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_NODISCARD_CTOR
+		explicit key(std::wstring_view k, source_region&& src = {}) //
+			: key_{ impl::narrow(k) },
+			  source_{ std::move(src) }
+		{}
+
+		/// \brief	Constructs a key from a wide string and source region.
+		///
+		/// \availability This constructor is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_NODISCARD_CTOR
+		explicit key(std::wstring_view k, const source_region& src) //
+			: key_{ impl::narrow(k) },
+			  source_{ src }
+		{}
+
+#endif
+
+		/// \name String operations
+		/// @{
+
+		/// \brief	Returns a view of the key's underlying string.
+		TOML_PURE_INLINE_GETTER
+		std::string_view str() const noexcept
+		{
+			return std::string_view{ key_ };
+		}
+
+		/// \brief	Returns a view of the key's underlying string.
+		TOML_PURE_INLINE_GETTER
+		/*implicit*/ operator std::string_view() const noexcept
+		{
+			return str();
+		}
+
+		/// \brief	Returns true if the key's underlying string is empty.
+		TOML_PURE_INLINE_GETTER
+		bool empty() const noexcept
+		{
+			return key_.empty();
+		}
+
+		/// \brief	Returns a pointer to the start of the key's underlying string.
+		TOML_PURE_INLINE_GETTER
+		const char* data() const noexcept
+		{
+			return key_.data();
+		}
+
+		/// \brief	Returns the length of the key's underlying string.
+		TOML_PURE_INLINE_GETTER
+		size_t length() const noexcept
+		{
+			return key_.length();
+		}
+
+		/// @}
+
+		/// \name Metadata
+		/// @{
+
+		/// \brief	Returns the source region responsible for specifying this key during parsing.
+		TOML_PURE_INLINE_GETTER
+		const source_region& source() const noexcept
+		{
+			return source_;
+		}
+
+		/// @}
+
+		/// \name Equality and Comparison
+		/// \attention These operations only compare the underlying strings; source regions are ignored for the purposes of all comparison!
+		/// @{
+
+		/// \brief	Returns true if `lhs.str() == rhs.str()`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator==(const key& lhs, const key& rhs) noexcept
+		{
+			return lhs.key_ == rhs.key_;
+		}
+
+		/// \brief	Returns true if `lhs.str() != rhs.str()`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator!=(const key& lhs, const key& rhs) noexcept
+		{
+			return lhs.key_ != rhs.key_;
+		}
+
+		/// \brief	Returns true if `lhs.str() < rhs.str()`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator<(const key& lhs, const key& rhs) noexcept
+		{
+			return lhs.key_ < rhs.key_;
+		}
+
+		/// \brief	Returns true if `lhs.str() <= rhs.str()`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator<=(const key& lhs, const key& rhs) noexcept
+		{
+			return lhs.key_ <= rhs.key_;
+		}
+
+		/// \brief	Returns true if `lhs.str() > rhs.str()`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator>(const key& lhs, const key& rhs) noexcept
+		{
+			return lhs.key_ > rhs.key_;
+		}
+
+		/// \brief	Returns true if `lhs.str() >= rhs.str()`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator>=(const key& lhs, const key& rhs) noexcept
+		{
+			return lhs.key_ >= rhs.key_;
+		}
+
+		/// \brief	Returns true if `lhs.str() == rhs`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator==(const key& lhs, std::string_view rhs) noexcept
+		{
+			return lhs.key_ == rhs;
+		}
+
+		/// \brief	Returns true if `lhs.str() != rhs`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator!=(const key& lhs, std::string_view rhs) noexcept
+		{
+			return lhs.key_ != rhs;
+		}
+
+		/// \brief	Returns true if `lhs.str() < rhs`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator<(const key& lhs, std::string_view rhs) noexcept
+		{
+			return lhs.key_ < rhs;
+		}
+
+		/// \brief	Returns true if `lhs.str() <= rhs`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator<=(const key& lhs, std::string_view rhs) noexcept
+		{
+			return lhs.key_ <= rhs;
+		}
+
+		/// \brief	Returns true if `lhs.str() > rhs`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator>(const key& lhs, std::string_view rhs) noexcept
+		{
+			return lhs.key_ > rhs;
+		}
+
+		/// \brief	Returns true if `lhs.str() >= rhs`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator>=(const key& lhs, std::string_view rhs) noexcept
+		{
+			return lhs.key_ >= rhs;
+		}
+
+		/// \brief	Returns true if `lhs == rhs.str()`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator==(std::string_view lhs, const key& rhs) noexcept
+		{
+			return lhs == rhs.key_;
+		}
+
+		/// \brief	Returns true if `lhs != rhs.str()`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator!=(std::string_view lhs, const key& rhs) noexcept
+		{
+			return lhs != rhs.key_;
+		}
+
+		/// \brief	Returns true if `lhs < rhs.str()`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator<(std::string_view lhs, const key& rhs) noexcept
+		{
+			return lhs < rhs.key_;
+		}
+
+		/// \brief	Returns true if `lhs <= rhs.str()`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator<=(std::string_view lhs, const key& rhs) noexcept
+		{
+			return lhs <= rhs.key_;
+		}
+
+		/// \brief	Returns true if `lhs > rhs.str()`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator>(std::string_view lhs, const key& rhs) noexcept
+		{
+			return lhs > rhs.key_;
+		}
+
+		/// \brief	Returns true if `lhs >= rhs.str()`.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator>=(std::string_view lhs, const key& rhs) noexcept
+		{
+			return lhs >= rhs.key_;
+		}
+
+		/// @}
+
+		/// \name Iteration
+		/// @{
+
+		/// \brief A const iterator for iterating over the characters in the key.
+		using const_iterator = const char*;
+
+		/// \brief A const iterator for iterating over the characters in the key.
+		using iterator = const_iterator;
+
+		/// \brief Returns an iterator to the first character in the key's backing string.
+		TOML_PURE_INLINE_GETTER
+		const_iterator begin() const noexcept
+		{
+			return key_.data();
+		}
+
+		/// \brief Returns an iterator to one-past-the-last character in the key's backing string.
+		TOML_PURE_INLINE_GETTER
+		const_iterator end() const noexcept
+		{
+			return key_.data() + key_.length();
+		}
+
+		/// @}
+
+		/// \brief	Prints the key's underlying string out to the stream.
+		friend std::ostream& operator<<(std::ostream& lhs, const key& rhs)
+		{
+			impl::print_to_stream(lhs, rhs.key_);
+			return lhs;
+		}
+	};
+
+	/// \brief	Metafunction for determining if a type is, or is a reference to, a toml::key.
+	template <typename T>
+	inline constexpr bool is_key = std::is_same_v<impl::remove_cvref<T>, toml::key>;
+
+	/// \brief	Metafunction for determining if a type is, or is a reference to, a toml::key,
+	///			or is implicitly or explicitly convertible to one.
+	template <typename T>
+	inline constexpr bool is_key_or_convertible = is_key<T> //
+											   || impl::is_constructible_or_convertible<toml::key, T>;
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/make_node.hpp

@@ -0,0 +1,182 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "forward_declarations.hpp"
+#include "header_start.hpp"
+
+/// \cond
+TOML_IMPL_NAMESPACE_START
+{
+	template <typename T>
+	TOML_NODISCARD
+	TOML_ATTR(returns_nonnull)
+	auto* make_node_impl_specialized(T && val, [[maybe_unused]] value_flags flags)
+	{
+		using unwrapped_type = unwrap_node<remove_cvref<T>>;
+		static_assert(!std::is_same_v<unwrapped_type, node>);
+		static_assert(!is_node_view<unwrapped_type>);
+
+		// arrays + tables - invoke copy/move ctor
+		if constexpr (is_one_of<unwrapped_type, array, table>)
+		{
+			return new unwrapped_type(static_cast<T&&>(val));
+		}
+
+		// values
+		else
+		{
+			using native_type = native_type_of<unwrapped_type>;
+			using value_type  = value<native_type>;
+
+			value_type* out;
+
+			// copy/move ctor
+			if constexpr (std::is_same_v<remove_cvref<T>, value_type>)
+			{
+				out = new value_type{ static_cast<T&&>(val), flags };
+			}
+
+			// creating from raw value
+			else
+			{
+				static_assert(!is_wide_string<T> || TOML_ENABLE_WINDOWS_COMPAT,
+							  "Instantiating values from wide-character strings is only "
+							  "supported on Windows with TOML_ENABLE_WINDOWS_COMPAT enabled.");
+
+				if constexpr (!is_losslessly_convertible_to_native<unwrapped_type>)
+				{
+					if constexpr (std::is_same_v<native_type, int64_t>)
+						static_assert(always_false<T>,
+									  "Integral value initializers must be losslessly convertible to int64_t");
+					else if constexpr (std::is_same_v<native_type, double>)
+						static_assert(always_false<T>,
+									  "Floating-point value initializers must be losslessly convertible to double");
+					else
+						static_assert(
+							always_false<T>,
+							"Value initializers must be losslessly convertible to one of the TOML value types");
+				}
+
+				if constexpr (is_wide_string<T>)
+				{
+#if TOML_ENABLE_WINDOWS_COMPAT
+					out = new value_type{ narrow(static_cast<T&&>(val)) };
+#else
+					static_assert(always_false<T>, "Evaluated unreachable branch!");
+#endif
+				}
+				else
+					out = new value_type{ static_cast<T&&>(val) };
+
+				if (flags != preserve_source_value_flags)
+					out->flags(flags);
+			}
+
+			return out;
+		}
+	}
+
+	template <typename T>
+	TOML_NODISCARD
+	auto* make_node_impl(T && val, value_flags flags = preserve_source_value_flags)
+	{
+		using unwrapped_type = unwrap_node<remove_cvref<T>>;
+		if constexpr (std::is_same_v<unwrapped_type, node> || is_node_view<unwrapped_type>)
+		{
+			if constexpr (is_node_view<unwrapped_type>)
+			{
+				if (!val)
+					return static_cast<toml::node*>(nullptr);
+			}
+
+			return static_cast<T&&>(val).visit(
+				[flags](auto&& concrete) {
+					return static_cast<toml::node*>(
+						make_node_impl_specialized(static_cast<decltype(concrete)&&>(concrete), flags));
+				});
+		}
+		else
+			return make_node_impl_specialized(static_cast<T&&>(val), flags);
+	}
+
+	template <typename T>
+	TOML_NODISCARD
+	auto* make_node_impl(inserter<T> && val, value_flags flags = preserve_source_value_flags)
+	{
+		return make_node_impl(static_cast<T&&>(val.value), flags);
+	}
+
+	template <typename T, bool = (is_node<T> || is_node_view<T> || is_value<T> || can_partially_represent_native<T>)>
+	struct inserted_type_of_
+	{
+		using type = std::remove_pointer_t<decltype(make_node_impl(std::declval<T>()))>;
+	};
+
+	template <typename T>
+	struct inserted_type_of_<inserter<T>, false>
+	{
+		using type = typename inserted_type_of_<remove_cvref<T>>::type;
+	};
+
+	template <typename T>
+	struct inserted_type_of_<T, false>
+	{
+		using type = void;
+	};
+
+	template <typename T>
+	TOML_NODISCARD
+	node_ptr make_node(T && val, value_flags flags = preserve_source_value_flags)
+	{
+		return node_ptr{ make_node_impl(static_cast<T&&>(val), flags) };
+	}
+
+	template <typename... T>
+	struct emplaced_type_of_
+	{
+		using type = void;
+	};
+
+	template <typename T>
+	struct emplaced_type_of_<T>
+	{
+		using type = std::conditional_t<is_one_of<T, node, node_view<node>, node_view<const node>>,
+										void,
+										typename inserted_type_of_<T>::type>;
+	};
+
+	template <typename T>
+	struct emplaced_type_of_<inserter<T>>
+	{
+		using type = typename emplaced_type_of_<remove_cvref<T>>::type;
+	};
+
+	template <typename... T>
+	using emplaced_type_of = typename emplaced_type_of_<remove_cvref<T>...>::type;
+}
+TOML_IMPL_NAMESPACE_END;
+/// \endcond
+
+TOML_NAMESPACE_START
+{
+	/// \brief	Metafunction for determining which node type would be constructed
+	///			if an object of this type was inserted into a toml::table or toml::array.
+	///
+	/// \detail \cpp
+	/// static_assert(std::is_same_v<toml::inserted_type_of<const char*>, toml::value<std::string>);
+	/// static_assert(std::is_same_v<toml::inserted_type_of<int>,         toml::value<int64_t>);
+	/// static_assert(std::is_same_v<toml::inserted_type_of<float>,       toml::value<double>);
+	/// static_assert(std::is_same_v<toml::inserted_type_of<bool>,        toml::value<bool>);
+	/// \ecpp
+	///
+	/// \note	This will return toml::node for nodes and node_views, even though a more specific node subclass
+	///			would actually be inserted. There is no way around this in a compile-time metafunction.
+	template <typename T>
+	using inserted_type_of = POXY_IMPLEMENTATION_DETAIL(typename impl::inserted_type_of_<impl::remove_cvref<T>>::type);
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/node.inl

@@ -0,0 +1,141 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+//# {{
+#include "preprocessor.hpp"
+#if !TOML_IMPLEMENTATION
+#error This is an implementation-only header.
+#endif
+//# }}
+
+#include "node.hpp"
+#include "node_view.hpp"
+#include "at_path.hpp"
+#include "table.hpp"
+#include "array.hpp"
+#include "value.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	TOML_EXTERNAL_LINKAGE
+	node::node() noexcept = default;
+
+	TOML_EXTERNAL_LINKAGE
+	node::~node() noexcept = default;
+
+	TOML_EXTERNAL_LINKAGE
+	node::node(node && other) noexcept //
+		: source_{ std::exchange(other.source_, {}) }
+	{}
+
+	TOML_EXTERNAL_LINKAGE
+	node::node(const node& /*other*/) noexcept
+	{
+		// does not copy source information - this is not an error
+		//
+		// see https://github.com/marzer/tomlplusplus/issues/49#issuecomment-665089577
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	node& node::operator=(const node& /*rhs*/) noexcept
+	{
+		// does not copy source information - this is not an error
+		//
+		// see https://github.com/marzer/tomlplusplus/issues/49#issuecomment-665089577
+
+		source_ = {};
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	node& node::operator=(node&& rhs) noexcept
+	{
+		if (&rhs != this)
+			source_ = std::exchange(rhs.source_, {});
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	node_view<node> node::at_path(std::string_view path) noexcept
+	{
+		return toml::at_path(*this, path);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	node_view<const node> node::at_path(std::string_view path) const noexcept
+	{
+		return toml::at_path(*this, path);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	node_view<node> node::at_path(const path& p) noexcept
+	{
+		return toml::at_path(*this, p);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	node_view<const node> node::at_path(const path& p) const noexcept
+	{
+		return toml::at_path(*this, p);
+	}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+	TOML_EXTERNAL_LINKAGE
+	node_view<node> node::at_path(std::wstring_view path)
+	{
+		return toml::at_path(*this, path);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	node_view<const node> node::at_path(std::wstring_view path) const
+	{
+		return toml::at_path(*this, path);
+	}
+
+#endif // TOML_ENABLE_WINDOWS_COMPAT
+
+	TOML_EXTERNAL_LINKAGE
+	node_view<node> node::operator[](const path& p) noexcept
+	{
+		return toml::at_path(*this, p);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	node_view<const node> node::operator[](const path& p) const noexcept
+	{
+		return toml::at_path(*this, p);
+	}
+}
+TOML_NAMESPACE_END;
+
+TOML_IMPL_NAMESPACE_START
+{
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	bool TOML_CALLCONV node_deep_equality(const node* lhs, const node* rhs) noexcept
+	{
+		// both same or both null
+		if (lhs == rhs)
+			return true;
+
+		// lhs null != rhs null or different types
+		if ((!lhs != !rhs) || lhs->type() != rhs->type())
+			return false;
+
+		return lhs->visit(
+			[=](auto& l) noexcept
+			{
+				using concrete_type = remove_cvref<decltype(l)>;
+
+				return l == *(rhs->as<concrete_type>());
+			});
+	}
+}
+TOML_IMPL_NAMESPACE_END;
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/node_view.hpp

@@ -0,0 +1,839 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "std_vector.hpp"
+#include "std_initializer_list.hpp"
+#include "print_to_stream.hpp"
+#include "node.hpp"
+#include "header_start.hpp"
+TOML_DISABLE_ARITHMETIC_WARNINGS;
+
+TOML_NAMESPACE_START
+{
+	/// \brief	A view of a node.
+	///
+	/// \detail A node_view is like a std::optional<toml::node&> (if such a construct were legal), with lots of
+	///			toml-specific stuff built-in. It _may_ represent a node, and allows you to do many of the
+	///			same operations that you'd do on nodes directly, as well as easily traversing the node tree by creating
+	/// 		subviews (via node_view::operator[]). \cpp
+	///
+	/// auto tbl = toml::parse(R"(
+	///
+	///		title = "my hardware store"
+	///
+	///		[[products]]
+	///		name = "Hammer"
+	///		sku = 738594937
+	///		keywords = [ "hammer", "construction", "build" ]
+	///
+	///		[[products]]
+	///		name = "Nail"
+	///		sku = 284758393
+	///		color = "gray"
+	///
+	/// )"sv);
+	///
+	/// std::cout << tbl["title"] << "\n";
+	/// std::cout << tbl["products"][0]["name"] << "\n";
+	/// std::cout << tbl["products"][0]["keywords"] << "\n";
+	/// std::cout << tbl["products"][0]["keywords"][2] << "\n";
+	///
+	/// tbl["products"][0]["keywords"].as_array()->push_back("heavy");
+	/// std::cout << tbl["products"][0]["keywords"] << "\n";
+	/// std::cout << "has product[2]: "sv << !!tbl["products"][2] << "\n";
+	/// std::cout << "product[2]: "sv << tbl["products"][2] << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// "my hardware store"
+	/// "Hammer"
+	/// [ "hammer", "construction", "build" ]
+	/// "build"
+	/// [ "hammer", "construction", "build", "heavy" ]
+	/// has product[2]: false
+	/// product[2]:
+	/// \eout
+	template <typename ViewedType>
+	class TOML_TRIVIAL_ABI node_view
+	{
+		static_assert(impl::is_one_of<ViewedType, toml::node, const toml::node>,
+					  "A toml::node_view<> must wrap toml::node or const toml::node.");
+
+	  public:
+		/// \brief	The node type being viewed - either `node` or `const node`.
+		using viewed_type = ViewedType;
+
+	  private:
+		template <typename T>
+		friend class node_view;
+
+		mutable viewed_type* node_ = nullptr;
+
+	  public:
+		/// \brief	Constructs an empty node view.
+		TOML_NODISCARD_CTOR
+		node_view() noexcept = default;
+
+		/// \brief	Constructs node_view of a specific node.
+		TOML_NODISCARD_CTOR
+		explicit node_view(viewed_type* node) noexcept //
+			: node_{ node }
+		{}
+
+		/// \brief	Constructs node_view of a specific node.
+		TOML_NODISCARD_CTOR
+		explicit node_view(viewed_type& node) noexcept //
+			: node_{ &node }
+		{}
+
+		/// \brief	Copy constructor.
+		TOML_NODISCARD_CTOR
+		node_view(const node_view&) noexcept = default;
+
+		/// \brief	Move constructor.
+		TOML_NODISCARD_CTOR
+		node_view(node_view&&) noexcept = default;
+
+		/// \brief	Copy-assignment operator.
+		node_view& operator=(const node_view&) & noexcept = default;
+
+		/// \brief	Move-assignment operator.
+		node_view& operator=(node_view&&) & noexcept = default;
+
+		/// \brief	Returns true if the view references a node.
+		TOML_PURE_INLINE_GETTER
+		explicit operator bool() const noexcept
+		{
+			return node_ != nullptr;
+		}
+
+		/// \brief	Returns the node that's being referenced by the view.
+		TOML_PURE_INLINE_GETTER
+		viewed_type* node() const noexcept
+		{
+			return node_;
+		}
+
+		/// \name Type checks
+		/// @{
+
+		/// \brief	Returns the type identifier for the viewed node.
+		TOML_PURE_GETTER
+		node_type type() const noexcept
+		{
+			return node_ ? node_->type() : node_type::none;
+		}
+
+		/// \brief	Returns true if the viewed node is a toml::table.
+		TOML_PURE_GETTER
+		bool is_table() const noexcept
+		{
+			return node_ && node_->is_table();
+		}
+
+		/// \brief	Returns true if the viewed node is a toml::array.
+		TOML_PURE_GETTER
+		bool is_array() const noexcept
+		{
+			return node_ && node_->is_array();
+		}
+
+		/// \brief	Returns true if the viewed node is a toml::value<>.
+		TOML_PURE_GETTER
+		bool is_value() const noexcept
+		{
+			return node_ && node_->is_value();
+		}
+
+		/// \brief	Returns true if the viewed node is a toml::value<string>.
+		TOML_PURE_GETTER
+		bool is_string() const noexcept
+		{
+			return node_ && node_->is_string();
+		}
+
+		/// \brief	Returns true if the viewed node is a toml::value<int64_t>.
+		TOML_PURE_GETTER
+		bool is_integer() const noexcept
+		{
+			return node_ && node_->is_integer();
+		}
+
+		/// \brief	Returns true if the viewed node is a toml::value<double>.
+		TOML_PURE_GETTER
+		bool is_floating_point() const noexcept
+		{
+			return node_ && node_->is_floating_point();
+		}
+
+		/// \brief	Returns true if the viewed node is a toml::value<int64_t> or toml::value<double>.
+		TOML_PURE_GETTER
+		bool is_number() const noexcept
+		{
+			return node_ && node_->is_number();
+		}
+
+		/// \brief	Returns true if the viewed node is a toml::value<bool>.
+		TOML_PURE_GETTER
+		bool is_boolean() const noexcept
+		{
+			return node_ && node_->is_boolean();
+		}
+
+		/// \brief	Returns true if the viewed node is a toml::value<date>.
+		TOML_PURE_GETTER
+		bool is_date() const noexcept
+		{
+			return node_ && node_->is_date();
+		}
+
+		/// \brief	Returns true if the viewed node is a toml::value<time>.
+		TOML_PURE_GETTER
+		bool is_time() const noexcept
+		{
+			return node_ && node_->is_time();
+		}
+
+		/// \brief	Returns true if the viewed node is a toml::value<date_time>.
+		TOML_PURE_GETTER
+		bool is_date_time() const noexcept
+		{
+			return node_ && node_->is_date_time();
+		}
+
+		/// \brief	Returns true if the viewed node is a toml::array that contains only tables.
+		TOML_PURE_GETTER
+		bool is_array_of_tables() const noexcept
+		{
+			return node_ && node_->is_array_of_tables();
+		}
+
+		/// \brief	Checks if this view references a node of a specific type.
+		///
+		/// \tparam	T	A TOML node or value type.
+		///
+		/// \returns	Returns true if the viewed node is an instance of the specified type.
+		///
+		/// \see toml::node::is()
+		template <typename T>
+		TOML_PURE_GETTER
+		bool is() const noexcept
+		{
+			return node_ ? node_->template is<impl::unwrap_node<impl::remove_cvref<T>>>() : false;
+		}
+
+		/// \brief	Checks if the viewed node contains values/elements of only one type.
+		///
+		/// \detail \cpp
+		/// auto cfg = toml::parse("arr = [ 1, 2, 3, 4.0 ]");
+		///
+		/// toml::node* nonmatch{};
+		/// if (cfg["arr"].is_homogeneous(toml::node_type::integer, nonmatch))
+		/// 	std::cout << "array was homogeneous"sv << "\n";
+		/// else
+		/// 	std::cout << "array was not homogeneous!\n"
+		/// 	<< "first non-match was a "sv << nonmatch->type() << " at " << nonmatch->source() << "\n";
+		/// \ecpp
+		///
+		/// \out
+		/// array was not homogeneous!
+		///	first non-match was a floating-point at line 1, column 18
+		/// \eout
+		///
+		/// \param	ntype	A TOML node type. <br>
+		/// 				\conditional_return{toml::node_type::none} "is every element the same type?"
+		/// 				\conditional_return{Anything else} "is every element one of these?"
+		///
+		/// \param first_nonmatch	Reference to a pointer in which the address of the first non-matching element
+		/// 						will be stored if the return value is false.
+		///
+		/// \returns	True if the viewed node was homogeneous.
+		///
+		/// \remarks	Always returns `false` if the view does not reference a node, or if the viewed node is
+		/// 			an empty table or array.
+		TOML_NODISCARD
+		bool is_homogeneous(node_type ntype, viewed_type*& first_nonmatch) const noexcept
+		{
+			if (!node_)
+			{
+				first_nonmatch = {};
+				return false;
+			}
+			return node_->is_homogeneous(ntype, first_nonmatch);
+		}
+
+		/// \brief	Checks if the viewed node contains values/elements of only one type.
+		///
+		/// \detail \cpp
+		/// auto cfg = toml::parse("arr = [ 1, 2, 3 ]");
+		/// std::cout << "homogenous: "sv << cfg["arr"].is_homogeneous(toml::node_type::none) << "\n";
+		/// std::cout << "all floats: "sv << cfg["arr"].is_homogeneous(toml::node_type::floating_point) << "\n";
+		/// std::cout << "all arrays: "sv << cfg["arr"].is_homogeneous(toml::node_type::array) << "\n";
+		/// std::cout << "all ints:   "sv << cfg["arr"].is_homogeneous(toml::node_type::integer) << "\n";
+		/// \ecpp
+		///
+		/// \out
+		/// homogeneous: true
+		/// all floats:  false
+		/// all arrays:  false
+		/// all ints:    true
+		/// \eout
+		///
+		/// \param	ntype	A TOML node type. <br>
+		/// 				\conditional_return{toml::node_type::none} "is every element the same type?"
+		/// 				\conditional_return{Anything else} "is every element one of these?"
+		///
+		/// \returns	True if the viewed node was homogeneous.
+		///
+		/// \remarks	Always returns `false` if the view does not reference a node, or if the viewed node is
+		/// 			an empty table or array.
+		TOML_NODISCARD
+		bool is_homogeneous(node_type ntype) const noexcept
+		{
+			return node_ ? node_->is_homogeneous(ntype) : false;
+		}
+
+		/// \brief	Checks if the viewed node contains values/elements of only one type.
+		///
+		/// \detail \cpp
+		/// auto cfg = toml::parse("arr = [ 1, 2, 3 ]");
+		/// std::cout << "homogenous:   "sv << cfg["arr"].is_homogeneous() << "\n";
+		/// std::cout << "all doubles:  "sv << cfg["arr"].is_homogeneous<double>() << "\n";
+		/// std::cout << "all arrays:   "sv << cfg["arr"].is_homogeneous<toml::array>() << "\n";
+		/// std::cout << "all integers: "sv << cfg["arr"].is_homogeneous<int64_t>() << "\n";
+		/// \ecpp
+		///
+		/// \out
+		/// homogeneous: true
+		/// all floats:  false
+		/// all arrays:  false
+		/// all ints:    true
+		/// \eout
+		///
+		/// \tparam	ElemType	A TOML node or value type. <br>
+		/// 					\conditional_return{Left as `void`} "is every element the same type?" <br>
+		/// 					\conditional_return{Explicitly specified} "is every element a T?"
+		///
+		/// \returns	True if the viewed node was homogeneous.
+		///
+		/// \remarks	Always returns `false` if the view does not reference a node, or if the viewed node is
+		/// 			an empty table or array.
+		template <typename ElemType = void>
+		TOML_PURE_GETTER
+		bool is_homogeneous() const noexcept
+		{
+			return node_ ? node_->template is_homogeneous<impl::unwrap_node<impl::remove_cvref<ElemType>>>() : false;
+		}
+
+		/// @}
+
+		/// \name Type casts
+		/// @{
+
+		/// \brief	Gets a pointer to the viewed node as a more specific node type.
+		///
+		/// \tparam	T	The node type or TOML value type to cast to.
+		///
+		/// \returns	A pointer to the node as the given type, or nullptr if it was a different type.
+		///
+		/// \see toml::node::as()
+		template <typename T>
+		TOML_PURE_GETTER
+		auto* as() const noexcept
+		{
+			return node_ ? node_->template as<T>() : nullptr;
+		}
+
+		/// \brief	Returns a pointer to the viewed node as a toml::table, if it is one.
+		TOML_PURE_GETTER
+		auto* as_table() const noexcept
+		{
+			return as<table>();
+		}
+
+		/// \brief	Returns a pointer to the viewed node as a toml::array, if it is one.
+		TOML_PURE_GETTER
+		auto* as_array() const noexcept
+		{
+			return as<array>();
+		}
+
+		/// \brief	Returns a pointer to the viewed node as a toml::value<string>, if it is one.
+		TOML_PURE_GETTER
+		auto* as_string() const noexcept
+		{
+			return as<std::string>();
+		}
+
+		/// \brief	Returns a pointer to the viewed node as a toml::value<int64_t>, if it is one.
+		TOML_PURE_GETTER
+		auto* as_integer() const noexcept
+		{
+			return as<int64_t>();
+		}
+
+		/// \brief	Returns a pointer to the viewed node as a toml::value<double>, if it is one.
+		TOML_PURE_GETTER
+		auto* as_floating_point() const noexcept
+		{
+			return as<double>();
+		}
+
+		/// \brief	Returns a pointer to the viewed node as a toml::value<bool>, if it is one.
+		TOML_PURE_GETTER
+		auto* as_boolean() const noexcept
+		{
+			return as<bool>();
+		}
+
+		/// \brief	Returns a pointer to the viewed node as a toml::value<date>, if it is one.
+		TOML_PURE_GETTER
+		auto* as_date() const noexcept
+		{
+			return as<date>();
+		}
+
+		/// \brief	Returns a pointer to the viewed node as a toml::value<time>, if it is one.
+		TOML_PURE_GETTER
+		auto* as_time() const noexcept
+		{
+			return as<time>();
+		}
+
+		/// \brief	Returns a pointer to the viewed node as a toml::value<date_time>, if it is one.
+		TOML_PURE_GETTER
+		auto* as_date_time() const noexcept
+		{
+			return as<date_time>();
+		}
+
+		/// @}
+
+		/// \name Value retrieval
+		/// @{
+
+		/// \brief	Gets the value contained by the referenced node.
+		///
+		/// \detail This function has 'exact' retrieval semantics; the only return value types allowed are the
+		/// 		TOML native value types, or types that can losslessly represent a native value type (e.g.
+		/// 		std::wstring on Windows).
+		///
+		/// \tparam	T	One of the native TOML value types, or a type capable of losslessly representing one.
+		///
+		/// \returns	The underlying value if the node was a value of the
+		/// 			matching type (or losslessly convertible to it), or an empty optional.
+		///
+		/// \see node_view::value()
+		template <typename T>
+		TOML_NODISCARD
+		optional<T> value_exact() const noexcept(impl::value_retrieval_is_nothrow<T>)
+		{
+			if (node_)
+				return node_->template value_exact<T>();
+			return {};
+		}
+
+		/// \brief	Gets the value contained by the referenced node.
+		///
+		/// \detail This function has 'permissive' retrieval semantics; some value types are allowed
+		/// 		to convert to others (e.g. retrieving a boolean as an integer), and the specified return value
+		/// 		type can be any type where a reasonable conversion from a native TOML value exists
+		/// 		(e.g. std::wstring on Windows). If the source value cannot be represented by
+		/// 		the destination type, an empty optional is returned. See node::value() for examples.
+		///
+		/// \tparam	T	One of the native TOML value types, or a type capable of convertible to one.
+		///
+		/// \returns	The underlying value if the node was a value of the matching type (or convertible to it)
+		/// 			and within the range of the output type, or an empty optional.
+		///
+		/// \note	If you want strict value retrieval semantics that do not allow for any type conversions,
+		/// 		use node_view::value_exact() instead.
+		///
+		/// \see
+		/// 	- node_view::value()
+		///		- node_view::value_exact()
+		template <typename T>
+		TOML_NODISCARD
+		optional<T> value() const noexcept(impl::value_retrieval_is_nothrow<T>)
+		{
+			if (node_)
+				return node_->template value<T>();
+			return {};
+		}
+
+		/// \brief	Gets the raw value contained by the referenced node, or a default.
+		///
+		/// \tparam	T				Default value type. Must be one of the native TOML value types,
+		/// 						or convertible to it.
+		/// \param 	default_value	The default value to return if the node wasn't a value, wasn't the
+		/// 						correct type, or no conversion was possible.
+		///
+		/// \returns	The underlying value if the node was a value of the matching type (or convertible to it)
+		/// 			and within the range of the output type, or the provided default.
+		///
+		/// \note	This function has the same permissive retrieval semantics as node::value(). If you want strict
+		/// 		value retrieval semantics that do not allow for any type conversions, use node_view::value_exact()
+		/// 		instead.
+		///
+		/// \see
+		/// 	- node_view::value()
+		///		- node_view::value_exact()
+		template <typename T>
+		TOML_NODISCARD
+		auto value_or(T&& default_value) const noexcept(impl::value_retrieval_is_nothrow<T>)
+		{
+			using namespace ::toml::impl;
+
+			static_assert(!is_wide_string<T> || TOML_ENABLE_WINDOWS_COMPAT,
+						  "Retrieving values as wide-character strings is only "
+						  "supported on Windows with TOML_ENABLE_WINDOWS_COMPAT enabled.");
+
+			if constexpr (is_wide_string<T>)
+			{
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+				if (node_)
+					return node_->value_or(static_cast<T&&>(default_value));
+				return std::wstring{ static_cast<T&&>(default_value) };
+
+#else
+
+				static_assert(impl::always_false<T>, "Evaluated unreachable branch!");
+
+#endif
+			}
+			else
+			{
+				using value_type =
+					std::conditional_t<std::is_pointer_v<std::decay_t<T>>,
+									   std::add_pointer_t<std::add_const_t<std::remove_pointer_t<std::decay_t<T>>>>,
+									   std::decay_t<T>>;
+
+				if (node_)
+					return node_->value_or(static_cast<T&&>(default_value));
+				if constexpr (std::is_pointer_v<value_type>)
+					return value_type{ default_value };
+				else
+					return static_cast<T&&>(default_value);
+			}
+		}
+
+		/// \brief	Gets a raw reference to the viewed node's underlying data.
+		///
+		/// \warning This function is dangerous if used carelessly and **WILL** break your code if the
+		/// 		 node_view didn't reference a node, or the chosen value type doesn't match the node's
+		/// 		 actual type. In debug builds an assertion will fire when invalid accesses are attempted: \cpp
+		///
+		/// auto tbl = toml::parse(R"(
+		///		min = 32
+		///		max = 45
+		/// )"sv);
+		///
+		/// int64_t& min_ref = tbl["min"].ref<int64_t>(); // matching type
+		/// double& max_ref = tbl["max"].ref<double>();  // mismatched type, hits assert()
+		/// int64_t& foo_ref = tbl["foo"].ref<int64_t>(); // nonexistent key, hits assert()
+		/// \ecpp
+		///
+		/// \note	Specifying explicit ref qualifiers acts as an explicit ref-category cast,
+		///			whereas specifying explicit cv-ref qualifiers merges them with whatever
+		///			the cv qualification of the viewed node is (to ensure cv-correctness is propagated), e.g.:
+		///			| node_view             | T                      | return type                  |
+		///			|-----------------------|------------------------|------------------------------|
+		///			| node_view<node>       | std::string            | std::string&                 |
+		///			| node_view<node>       | std::string&&          | std::string&&                |
+		///			| node_view<const node> | volatile std::string   | const volatile std::string&  |
+		///			| node_view<const node> | volatile std::string&& | const volatile std::string&& |
+		///
+		///
+		/// \tparam	T	One of the TOML value types.
+		///
+		/// \returns	A reference to the underlying data.
+		template <typename T>
+		TOML_PURE_INLINE_GETTER
+		decltype(auto) ref() const noexcept
+		{
+			TOML_ASSERT_ASSUME(node_ && "toml::node_view::ref() called on a node_view that did not reference a node");
+			return node_->template ref<T>();
+		}
+
+		/// @}
+
+		/// \name Visitation
+		/// @{
+
+	  private:
+		/// \cond
+		template <typename Func>
+		static constexpr bool visit_is_nothrow = noexcept(std::declval<viewed_type*>()->visit(std::declval<Func>()));
+		/// \endcond
+
+	  public:
+		/// \brief	Invokes a visitor on the viewed node based on its concrete type.
+		///
+		/// \remarks Has no effect if the view does not reference a node.
+		///
+		/// \see node::visit()
+		template <typename Func>
+		decltype(auto) visit(Func&& visitor) const noexcept(visit_is_nothrow<Func&&>)
+		{
+			using return_type = decltype(node_->visit(static_cast<Func&&>(visitor)));
+			if (node_)
+				return node_->visit(static_cast<Func&&>(visitor));
+			if constexpr (!std::is_void_v<return_type>)
+				return return_type{};
+		}
+
+		/// @}
+
+		/// \name Equality
+		/// @{
+
+	  public:
+		/// \brief	Returns true if the two views refer to nodes of the same type and value.
+		template <typename T>
+		TOML_PURE_GETTER
+		friend bool operator==(const node_view& lhs, const node_view<T>& rhs) noexcept
+		{
+			return impl::node_deep_equality(lhs.node_, rhs.node_);
+		}
+
+		/// \brief	Returns true if the two views do not refer to nodes of the same type and value.
+		template <typename T>
+		TOML_PURE_GETTER
+		friend bool operator!=(const node_view& lhs, const node_view<T>& rhs) noexcept
+		{
+			return !impl::node_deep_equality(lhs.node_, rhs.node_);
+		}
+
+		/// \brief	Returns true if the viewed node is a table with the same contents as RHS.
+		TOML_NODISCARD
+		friend bool operator==(const node_view& lhs, const table& rhs) noexcept
+		{
+			if (lhs.node_ == &rhs)
+				return true;
+			const auto tbl = lhs.as<table>();
+			return tbl && *tbl == rhs;
+		}
+		TOML_ASYMMETRICAL_EQUALITY_OPS(const node_view&, const table&, );
+
+		/// \brief	Returns true if the viewed node is an array with the same contents as RHS.
+		TOML_NODISCARD
+		friend bool operator==(const node_view& lhs, const array& rhs) noexcept
+		{
+			if (lhs.node_ == &rhs)
+				return true;
+			const auto arr = lhs.as<array>();
+			return arr && *arr == rhs;
+		}
+		TOML_ASYMMETRICAL_EQUALITY_OPS(const node_view&, const array&, );
+
+		/// \brief	Returns true if the viewed node is a value with the same value as RHS.
+		template <typename T>
+		TOML_NODISCARD
+		friend bool operator==(const node_view& lhs, const toml::value<T>& rhs) noexcept
+		{
+			if (lhs.node_ == &rhs)
+				return true;
+			const auto val = lhs.as<T>();
+			return val && *val == rhs;
+		}
+		TOML_ASYMMETRICAL_EQUALITY_OPS(const node_view&, const toml::value<T>&, template <typename T>);
+
+		/// \brief	Returns true if the viewed node is a value with the same value as RHS.
+		TOML_CONSTRAINED_TEMPLATE(impl::is_losslessly_convertible_to_native<T>, typename T)
+		TOML_NODISCARD
+		friend bool operator==(const node_view& lhs, const T& rhs) noexcept(!impl::is_wide_string<T>)
+		{
+			static_assert(!impl::is_wide_string<T> || TOML_ENABLE_WINDOWS_COMPAT,
+						  "Comparison with wide-character strings is only "
+						  "supported on Windows with TOML_ENABLE_WINDOWS_COMPAT enabled.");
+
+			if constexpr (impl::is_wide_string<T>)
+			{
+#if TOML_ENABLE_WINDOWS_COMPAT
+				return lhs == impl::narrow(rhs);
+#else
+				static_assert(impl::always_false<T>, "Evaluated unreachable branch!");
+#endif
+			}
+			else
+			{
+				const auto val = lhs.as<impl::native_type_of<T>>();
+				return val && *val == rhs;
+			}
+		}
+		TOML_ASYMMETRICAL_EQUALITY_OPS(const node_view&,
+									   const T&,
+									   TOML_CONSTRAINED_TEMPLATE(impl::is_losslessly_convertible_to_native<T>,
+																 typename T));
+
+		/// \brief	Returns true if the viewed node is an array with the same contents as the RHS initializer list.
+		template <typename T>
+		TOML_NODISCARD
+		friend bool operator==(const node_view& lhs,
+							   const std::initializer_list<T>& rhs) noexcept(!impl::is_wide_string<T>)
+		{
+			const auto arr = lhs.as<array>();
+			return arr && *arr == rhs;
+		}
+		TOML_ASYMMETRICAL_EQUALITY_OPS(const node_view&, const std::initializer_list<T>&, template <typename T>);
+
+		/// \brief	Returns true if the viewed node is an array with the same contents as the RHS vector.
+		template <typename T>
+		TOML_NODISCARD
+		friend bool operator==(const node_view& lhs, const std::vector<T>& rhs) noexcept(!impl::is_wide_string<T>)
+		{
+			const auto arr = lhs.as<array>();
+			return arr && *arr == rhs;
+		}
+		TOML_ASYMMETRICAL_EQUALITY_OPS(const node_view&, const std::vector<T>&, template <typename T>);
+
+		/// @}
+
+		/// \name Subviews
+		/// @{
+
+		/// \brief	Returns a view of the selected subnode.
+		///
+		/// \param 	key	The key of the node to retrieve
+		///
+		/// \returns	A view of the selected node if this node represented a table and it contained a
+		/// 			value at the given key, or an empty view.
+		TOML_NODISCARD
+		node_view operator[](std::string_view key) const noexcept
+		{
+			if (auto tbl = this->as_table())
+				return node_view{ tbl->get(key) };
+			return {};
+		}
+
+		/// \brief	Returns a view of the selected subnode.
+		///
+		/// \param 	path	A "TOML path" to the desired subnode
+		///
+		/// \returns	A view of the selected node if this node represented a table and it contained a
+		/// 			value at the given key, or an empty view.
+		TOML_NODISCARD
+		node_view operator[](const toml::path& path) const noexcept
+		{
+			return node_ ? node_->at_path(path) : node_view{};
+		}
+
+		/// \brief Returns a view of the subnode matching a fully-qualified "TOML path".
+		///
+		/// \see #toml::node::at_path(std::string_view)
+		TOML_NODISCARD
+		node_view at_path(std::string_view path) const noexcept
+		{
+			return node_ ? node_->at_path(path) : node_view{};
+		}
+
+		/// \brief Returns a view of the subnode matching a fully-qualified "TOML path".
+		///
+		/// \see #toml::node::at_path(const toml::path&)
+		TOML_NODISCARD
+		node_view at_path(const toml::path& path) const noexcept
+		{
+			return node_ ? node_->at_path(path) : node_view{};
+		}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief	Returns a view of the selected subnode.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		///
+		/// \param 	key	The key of the node to retrieve
+		///
+		/// \returns	A view of the selected node if this node represented a table and it contained a
+		/// 			value at the given key, or an empty view.
+		TOML_NODISCARD
+		node_view operator[](std::wstring_view key) const
+		{
+			if (auto tbl = this->as_table())
+				return node_view{ tbl->get(key) };
+			return {};
+		}
+
+		/// \brief Returns a view of the subnode matching a fully-qualified "TOML path".
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		///
+		/// \see #toml::node::at_path(std::string_view)
+		TOML_NODISCARD
+		node_view at_path(std::wstring_view path) const
+		{
+			return node_ ? node_->at_path(path) : node_view{};
+		}
+
+#endif // TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief	Returns a view of the selected subnode.
+		///
+		/// \param 	index The index of the node to retrieve
+		///
+		/// \returns	A view of the selected node if this node represented an array and it contained a
+		/// 			value at the given index, or an empty view.
+		TOML_NODISCARD
+		node_view operator[](size_t index) const noexcept
+		{
+			if (auto arr = this->as_array())
+				return node_view{ arr->get(index) };
+			return {};
+		}
+
+		/// @}
+
+#if TOML_ENABLE_FORMATTERS
+
+		/// \brief	Prints the viewed node out to a stream.
+		///
+		/// \availability This operator is only available when #TOML_ENABLE_FORMATTERS is enabled.
+		friend std::ostream& operator<<(std::ostream& os, const node_view& nv)
+		{
+			if (nv.node_)
+				nv.node_->visit([&os](const auto& n) { os << n; });
+			return os;
+		}
+
+#endif
+	};
+
+	/// \cond
+
+	template <typename T>
+	node_view(const T&) -> node_view<const node>;
+
+	template <typename T>
+	node_view(const T*) -> node_view<const node>;
+
+	template <typename T>
+	node_view(T&) -> node_view<node>;
+
+	template <typename T>
+	node_view(T*) -> node_view<node>;
+
+	/// \endcond
+}
+TOML_NAMESPACE_END;
+
+/// \cond
+TOML_NAMESPACE_START
+{
+	inline node::operator node_view<node>() noexcept
+	{
+		return node_view<node>{ this };
+	}
+
+	inline node::operator node_view<const node>() const noexcept
+	{
+		return node_view<const node>{ this };
+	}
+}
+TOML_NAMESPACE_END;
+/// \endcond
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/parse_error.hpp

@@ -0,0 +1,139 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+#if TOML_ENABLE_PARSER
+
+#include "std_except.hpp"
+#include "source_region.hpp"
+#include "print_to_stream.hpp"
+#include "header_start.hpp"
+
+#if TOML_DOXYGEN || !TOML_EXCEPTIONS
+#define TOML_PARSE_ERROR_BASE
+#else
+#define TOML_PARSE_ERROR_BASE	 : public std::runtime_error
+#endif
+
+TOML_NAMESPACE_START
+{
+	TOML_ABI_NAMESPACE_BOOL(TOML_EXCEPTIONS, ex, noex);
+
+	/// \brief	An error generated when parsing fails.
+	///
+	/// \remarks This class inherits from std::runtime_error when exceptions are enabled.
+	/// 		 The public interface is the same regardless of exception mode.
+	class parse_error TOML_PARSE_ERROR_BASE
+	{
+	  private:
+#if !TOML_EXCEPTIONS
+		std::string description_;
+#endif
+		source_region source_;
+
+	  public:
+#if TOML_EXCEPTIONS
+
+		TOML_NODISCARD_CTOR
+		TOML_ATTR(nonnull)
+		parse_error(const char* desc, source_region&& src) noexcept //
+			: std::runtime_error{ desc },
+			  source_{ std::move(src) }
+		{}
+
+		TOML_NODISCARD_CTOR
+		TOML_ATTR(nonnull)
+		parse_error(const char* desc, const source_region& src) noexcept //
+			: parse_error{ desc, source_region{ src } }
+		{}
+
+		TOML_NODISCARD_CTOR
+		TOML_ATTR(nonnull)
+		parse_error(const char* desc, const source_position& position, const source_path_ptr& path = {}) noexcept
+			: parse_error{ desc, source_region{ position, position, path } }
+		{}
+
+#else
+
+		TOML_NODISCARD_CTOR
+		parse_error(std::string&& desc, source_region&& src) noexcept //
+			: description_{ std::move(desc) },
+			  source_{ std::move(src) }
+		{}
+
+		TOML_NODISCARD_CTOR
+		parse_error(std::string&& desc, const source_region& src) noexcept //
+			: parse_error{ std::move(desc), source_region{ src } }
+		{}
+
+		TOML_NODISCARD_CTOR
+		parse_error(std::string&& desc, const source_position& position, const source_path_ptr& path = {}) noexcept
+			: parse_error{ std::move(desc), source_region{ position, position, path } }
+		{}
+
+#endif
+
+		/// \brief	Returns a textual description of the error.
+		/// \remark The backing string is guaranteed to be null-terminated.
+		TOML_NODISCARD
+		std::string_view description() const noexcept
+		{
+#if TOML_EXCEPTIONS
+			return std::string_view{ what() };
+#else
+			return description_;
+#endif
+		}
+
+		/// \brief	Returns the region of the source document responsible for the error.
+		TOML_NODISCARD
+		const source_region& source() const noexcept
+		{
+			return source_;
+		}
+
+		/// \brief	Prints a parse_error to a stream.
+		///
+		/// \detail \cpp
+		/// try
+		/// {
+		/// 	auto tbl = toml::parse("enabled = trUe"sv);
+		/// }
+		/// catch (const toml::parse_error & err)
+		/// {
+		/// 	std::cerr << "Parsing failed:\n"sv << err << "\n";
+		/// }
+		/// \ecpp
+		///
+		/// \out
+		/// Parsing failed:
+		/// Encountered unexpected character while parsing boolean; expected 'true', saw 'trU'
+		///		(error occurred at line 1, column 13)
+		/// \eout
+		///
+		/// \tparam Char The output stream's underlying character type. Must be 1 byte in size.
+		/// \param 	lhs	The stream.
+		/// \param 	rhs	The parse_error.
+		///
+		/// \returns	The input stream.
+		friend std::ostream& operator<<(std::ostream& lhs, const parse_error& rhs)
+		{
+			impl::print_to_stream(lhs, rhs.description());
+			impl::print_to_stream(lhs, "\n\t(error occurred at "sv);
+			impl::print_to_stream(lhs, rhs.source());
+			impl::print_to_stream(lhs, ")"sv);
+			return lhs;
+		}
+	};
+
+	TOML_ABI_NAMESPACE_END; // TOML_EXCEPTIONS
+}
+TOML_NAMESPACE_END;
+
+#undef TOML_PARSE_ERROR_BASE
+
+#include "header_end.hpp"
+#endif // TOML_ENABLE_PARSER

third_party/toml++/include/toml++/impl/parse_result.hpp

@@ -0,0 +1,499 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+#if TOML_DOXYGEN || (TOML_ENABLE_PARSER && !TOML_EXCEPTIONS)
+
+#include "table.hpp"
+#include "parse_error.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	TOML_ABI_NAMESPACE_START(noex);
+
+	/// \brief	The result of a parsing operation.
+	///
+	/// \availability <strong>This type only exists when exceptions are disabled.</strong>
+	/// 		 Otherwise parse_result is just an alias for toml::table: \cpp
+	/// #if TOML_EXCEPTIONS
+	///		using parse_result = table;
+	/// #else
+	///		class parse_result { // ...
+	///	#endif
+	/// \ecpp
+	///
+	/// \detail A parse_result is effectively a discriminated union containing either a toml::table
+	/// 		or a toml::parse_error. Most member functions assume a particular one of these two states,
+	/// 		and calling them when in the wrong state will cause errors (e.g. attempting to access the
+	/// 		error object when parsing was successful). \cpp
+	/// toml::parse_result result = toml::parse_file("config.toml");
+	/// if (result)
+	///		do_stuff_with_a_table(result); //implicitly converts to table&
+	///	else
+	///		std::cerr << "Parse failed:\n"sv << result.error() << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// example output:
+	///
+	/// Parse failed:
+	/// Encountered unexpected character while parsing boolean; expected 'true', saw 'trU'
+	///		(error occurred at line 1, column 13 of 'config.toml')
+	/// \eout
+	///
+	/// Getting node_views (`operator[]`, `at_path()`) and using the iterator accessor functions (`begin()`, `end()` etc.) are
+	/// unconditionally safe; when parsing fails these just return 'empty' values. A ranged-for loop on a failed
+	/// parse_result is also safe since `begin()` and `end()` return the same iterator and will not lead to any
+	/// dereferences and iterations.
+	class parse_result
+	{
+	  private:
+		struct storage_t
+		{
+			static constexpr size_t size =
+				(sizeof(toml::table) < sizeof(parse_error) ? sizeof(parse_error) : sizeof(toml::table));
+			static constexpr size_t align =
+				(alignof(toml::table) < alignof(parse_error) ? alignof(parse_error) : alignof(toml::table));
+
+			alignas(align) unsigned char bytes[size];
+		};
+
+		alignas(storage_t::align) mutable storage_t storage_;
+		bool err_;
+
+		template <typename Type>
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		static Type* get_as(storage_t& s) noexcept
+		{
+			return TOML_LAUNDER(reinterpret_cast<Type*>(s.bytes));
+		}
+
+		void destroy() noexcept
+		{
+			if (err_)
+				get_as<parse_error>(storage_)->~parse_error();
+			else
+				get_as<toml::table>(storage_)->~table();
+		}
+
+	  public:
+		/// \brief Default constructs an 'error' result.
+		TOML_NODISCARD_CTOR
+		parse_result() noexcept //
+			: err_{ true }
+		{
+			::new (static_cast<void*>(storage_.bytes)) parse_error{ std::string{}, source_region{} };
+		}
+
+		TOML_NODISCARD_CTOR
+		explicit parse_result(toml::table&& tbl) noexcept //
+			: err_{ false }
+		{
+			::new (static_cast<void*>(storage_.bytes)) toml::table{ std::move(tbl) };
+		}
+
+		TOML_NODISCARD_CTOR
+		explicit parse_result(parse_error&& err) noexcept //
+			: err_{ true }
+		{
+			::new (static_cast<void*>(storage_.bytes)) parse_error{ std::move(err) };
+		}
+
+		/// \brief	Move constructor.
+		TOML_NODISCARD_CTOR
+		parse_result(parse_result&& res) noexcept //
+			: err_{ res.err_ }
+		{
+			if (err_)
+				::new (static_cast<void*>(storage_.bytes)) parse_error{ std::move(res).error() };
+			else
+				::new (static_cast<void*>(storage_.bytes)) toml::table{ std::move(res).table() };
+		}
+
+		/// \brief	Move-assignment operator.
+		parse_result& operator=(parse_result&& rhs) noexcept
+		{
+			if (err_ != rhs.err_)
+			{
+				destroy();
+				err_ = rhs.err_;
+				if (err_)
+					::new (static_cast<void*>(storage_.bytes)) parse_error{ std::move(rhs).error() };
+				else
+					::new (static_cast<void*>(storage_.bytes)) toml::table{ std::move(rhs).table() };
+			}
+			else
+			{
+				if (err_)
+					error() = std::move(rhs).error();
+				else
+					table() = std::move(rhs).table();
+			}
+			return *this;
+		}
+
+		/// \brief	Destructor.
+		~parse_result() noexcept
+		{
+			destroy();
+		}
+
+		/// \name Result state
+		/// @{
+
+		/// \brief	Returns true if parsing succeeeded.
+		TOML_NODISCARD
+		bool succeeded() const noexcept
+		{
+			return !err_;
+		}
+
+		/// \brief	Returns true if parsing failed.
+		TOML_NODISCARD
+		bool failed() const noexcept
+		{
+			return err_;
+		}
+
+		/// \brief	Returns true if parsing succeeded.
+		TOML_NODISCARD
+		explicit operator bool() const noexcept
+		{
+			return !err_;
+		}
+
+		/// @}
+
+		/// \name Successful parses
+		/// \warning It is undefined behaviour to call these functions when the result respresents a failed parse.
+		/// Check #failed(), #succeeded or #operator bool() to determine the result's state.
+		/// @{
+
+		/// \brief	Returns the internal toml::table.
+		TOML_NODISCARD
+		toml::table& table() & noexcept
+		{
+			TOML_ASSERT_ASSUME(!err_);
+			return *get_as<toml::table>(storage_);
+		}
+
+		/// \brief	Returns the internal toml::table (rvalue overload).
+		TOML_NODISCARD
+		toml::table&& table() && noexcept
+		{
+			TOML_ASSERT_ASSUME(!err_);
+			return static_cast<toml::table&&>(*get_as<toml::table>(storage_));
+		}
+
+		/// \brief	Returns the internal toml::table (const lvalue overload).
+		TOML_NODISCARD
+		const toml::table& table() const& noexcept
+		{
+			TOML_ASSERT_ASSUME(!err_);
+			return *get_as<const toml::table>(storage_);
+		}
+
+		/// \brief	Returns the internal toml::table.
+		TOML_NODISCARD
+		/* implicit */ operator toml::table&() noexcept
+		{
+			return table();
+		}
+
+		/// \brief	Returns the internal toml::table (rvalue overload).
+		TOML_NODISCARD
+		/* implicit */ operator toml::table&&() noexcept
+		{
+			return std::move(table());
+		}
+
+		/// \brief	Returns the internal toml::table (const lvalue overload).
+		TOML_NODISCARD
+		/* implicit */ operator const toml::table&() const noexcept
+		{
+			return table();
+		}
+
+		/// @}
+
+		/// \name Failed parses
+		/// \warning It is undefined behaviour to call these functions when the result respresents a successful parse.
+		/// Check #failed(), #succeeded or #operator bool() to determine the result's state.
+		/// @{
+
+		/// \brief	Returns the internal toml::parse_error.
+		TOML_NODISCARD
+		parse_error& error() & noexcept
+		{
+			TOML_ASSERT_ASSUME(err_);
+			return *get_as<parse_error>(storage_);
+		}
+
+		/// \brief	Returns the internal toml::parse_error (rvalue overload).
+		TOML_NODISCARD
+		parse_error&& error() && noexcept
+		{
+			TOML_ASSERT_ASSUME(err_);
+			return static_cast<parse_error&&>(*get_as<parse_error>(storage_));
+		}
+
+		/// \brief	Returns the internal toml::parse_error (const lvalue overload).
+		TOML_NODISCARD
+		const parse_error& error() const& noexcept
+		{
+			TOML_ASSERT_ASSUME(err_);
+			return *get_as<const parse_error>(storage_);
+		}
+
+		/// \brief	Returns the internal toml::parse_error.
+		TOML_NODISCARD
+		explicit operator parse_error&() noexcept
+		{
+			return error();
+		}
+
+		/// \brief	Returns the internal toml::parse_error (rvalue overload).
+		TOML_NODISCARD
+		explicit operator parse_error&&() noexcept
+		{
+			return std::move(error());
+		}
+
+		/// \brief	Returns the internal toml::parse_error (const lvalue overload).
+		TOML_NODISCARD
+		explicit operator const parse_error&() const noexcept
+		{
+			return error();
+		}
+
+		/// @}
+
+		/// \name Iteration
+		/// @{
+
+		/// \brief A BidirectionalIterator for iterating over key-value pairs in a wrapped toml::table.
+		using iterator = table_iterator;
+
+		/// \brief A BidirectionalIterator for iterating over const key-value pairs in a wrapped toml::table.
+		using const_iterator = const_table_iterator;
+
+		/// \brief	Returns an iterator to the first key-value pair in the wrapped table.
+		/// \remarks Always returns the same value as #end() if parsing failed.
+		TOML_NODISCARD
+		table_iterator begin() noexcept
+		{
+			return err_ ? table_iterator{} : table().begin();
+		}
+
+		/// \brief	Returns an iterator to the first key-value pair in the wrapped table.
+		/// \remarks Always returns the same value as #end() if parsing failed.
+		TOML_NODISCARD
+		const_table_iterator begin() const noexcept
+		{
+			return err_ ? const_table_iterator{} : table().begin();
+		}
+
+		/// \brief	Returns an iterator to the first key-value pair in the wrapped table.
+		/// \remarks Always returns the same value as #cend() if parsing failed.
+		TOML_NODISCARD
+		const_table_iterator cbegin() const noexcept
+		{
+			return err_ ? const_table_iterator{} : table().cbegin();
+		}
+
+		/// \brief	Returns an iterator to one-past-the-last key-value pair in the wrapped table.
+		TOML_NODISCARD
+		table_iterator end() noexcept
+		{
+			return err_ ? table_iterator{} : table().end();
+		}
+
+		/// \brief	Returns an iterator to one-past-the-last key-value pair in the wrapped table.
+		TOML_NODISCARD
+		const_table_iterator end() const noexcept
+		{
+			return err_ ? const_table_iterator{} : table().end();
+		}
+
+		/// \brief	Returns an iterator to one-past-the-last key-value pair in the wrapped table.
+		TOML_NODISCARD
+		const_table_iterator cend() const noexcept
+		{
+			return err_ ? const_table_iterator{} : table().cend();
+		}
+
+		/// @}
+
+		/// \name Node views
+		/// @{
+
+		/// \brief Returns a view of the subnode matching a fully-qualified "TOML path".
+		///
+		/// \see #toml::node::at_path(std::string_view)
+		TOML_NODISCARD
+		node_view<node> at_path(std::string_view path) noexcept
+		{
+			return err_ ? node_view<node>{} : table().at_path(path);
+		}
+
+		/// \brief Returns a const view of the subnode matching a fully-qualified "TOML path".
+		///
+		/// \see #toml::node::at_path(std::string_view)
+		TOML_NODISCARD
+		node_view<const node> at_path(std::string_view path) const noexcept
+		{
+			return err_ ? node_view<const node>{} : table().at_path(path);
+		}
+
+		/// \brief Returns a view of the subnode matching a fully-qualified "TOML path".
+		///
+		/// \see #toml::node::at_path(const toml::path&)
+		TOML_NODISCARD
+		node_view<node> at_path(const toml::path& path) noexcept
+		{
+			return err_ ? node_view<node>{} : table().at_path(path);
+		}
+
+		/// \brief Returns a const view of the subnode matching a fully-qualified "TOML path".
+		///
+		/// \see #toml::node::at_path(const toml::path&)
+		TOML_NODISCARD
+		node_view<const node> at_path(const toml::path& path) const noexcept
+		{
+			return err_ ? node_view<const node>{} : table().at_path(path);
+		}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief Returns a view of the subnode matching a fully-qualified "TOML path".
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		///
+		/// \see #toml::node::at_path(std::string_view)
+		TOML_NODISCARD
+		node_view<node> at_path(std::wstring_view path)
+		{
+			return err_ ? node_view<node>{} : table().at_path(path);
+		}
+
+		/// \brief Returns a const view of the subnode matching a fully-qualified "TOML path".
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		///
+		/// \see #toml::node::at_path(std::string_view)
+		TOML_NODISCARD
+		node_view<const node> at_path(std::wstring_view path) const
+		{
+			return err_ ? node_view<const node>{} : table().at_path(path);
+		}
+
+#endif
+
+		/// \brief Returns a view of the subnode matching a fully-qualified "TOML path".
+		///
+		/// \see #toml::node::operator[](const toml::path&)
+		TOML_NODISCARD
+		node_view<node> operator[](const toml::path& path) noexcept
+		{
+			return err_ ? node_view<node>{} : table()[path];
+		}
+
+		/// \brief Returns a const view of the subnode matching a fully-qualified "TOML path".
+		///
+		/// \see #toml::node::operator[](const toml::path&)
+		TOML_NODISCARD
+		node_view<const node> operator[](const toml::path& path) const noexcept
+		{
+			return err_ ? node_view<const node>{} : table()[path];
+		}
+
+		/// \brief	Gets a node_view for the selected key-value pair in the wrapped table.
+		///
+		/// \param 	key The key used for the lookup.
+		///
+		/// \returns	A view of the value at the given key if parsing was successful and a matching key existed,
+		/// 			or an empty node view.
+		///
+		/// \see toml::node_view
+		TOML_NODISCARD
+		node_view<node> operator[](std::string_view key) noexcept
+		{
+			return err_ ? node_view<node>{} : table()[key];
+		}
+
+		/// \brief	Gets a node_view for the selected key-value pair in the wrapped table (const overload).
+		///
+		/// \param 	key The key used for the lookup.
+		///
+		/// \returns	A view of the value at the given key if parsing was successful and a matching key existed,
+		/// 			or an empty node view.
+		///
+		/// \see toml::node_view
+		TOML_NODISCARD
+		node_view<const node> operator[](std::string_view key) const noexcept
+		{
+			return err_ ? node_view<const node>{} : table()[key];
+		}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief	Gets a node_view for the selected key-value pair in the wrapped table.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		///
+		/// \param 	key The key used for the lookup.
+		///
+		/// \returns	A view of the value at the given key if parsing was successful and a matching key existed,
+		/// 			or an empty node view.
+		///
+		/// \see toml::node_view
+		TOML_NODISCARD
+		node_view<node> operator[](std::wstring_view key)
+		{
+			return err_ ? node_view<node>{} : table()[key];
+		}
+
+		/// \brief	Gets a node_view for the selected key-value pair in the wrapped table (const overload).
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		///
+		/// \param 	key The key used for the lookup.
+		///
+		/// \returns	A view of the value at the given key if parsing was successful and a matching key existed,
+		/// 			or an empty node view.
+		///
+		/// \see toml::node_view
+		TOML_NODISCARD
+		node_view<const node> operator[](std::wstring_view key) const
+		{
+			return err_ ? node_view<const node>{} : table()[key];
+		}
+
+#endif // TOML_ENABLE_WINDOWS_COMPAT
+
+		/// @}
+
+#if TOML_ENABLE_FORMATTERS
+
+		/// \brief Prints the held error or table object out to a text stream.
+		///
+		/// \availability This operator is only available when #TOML_ENABLE_FORMATTERS is enabled.
+		friend std::ostream& operator<<(std::ostream& os, const parse_result& result)
+		{
+			return result.err_ ? (os << result.error()) : (os << result.table());
+		}
+
+#endif
+	};
+
+	TOML_ABI_NAMESPACE_END;
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"
+#endif // TOML_ENABLE_PARSER && !TOML_EXCEPTIONS

third_party/toml++/include/toml++/impl/parser.hpp

@@ -0,0 +1,390 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+#if TOML_ENABLE_PARSER
+
+#include "table.hpp"
+#include "parse_result.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	TOML_ABI_NAMESPACE_BOOL(TOML_EXCEPTIONS, ex, noex);
+
+	/// \brief	Parses a TOML document from a string view.
+	///
+	/// \detail \cpp
+	/// auto tbl = toml::parse("a = 3"sv);
+	/// std::cout << tbl["a"] << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// 3
+	/// \eout
+	///
+	/// \param 	doc				The TOML document to parse. Must be valid UTF-8.
+	/// \param 	source_path		The path used to initialize each node's `source().path`.
+	/// 						If you don't have a path (or you have no intention of using paths in diagnostics)
+	/// 						then this parameter can safely be left blank.
+	///
+	/// \returns	\conditional_return{With exceptions}
+	///				A toml::table.
+	/// 			\conditional_return{Without exceptions}
+	///				A toml::parse_result.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	parse_result TOML_CALLCONV parse(std::string_view doc, std::string_view source_path = {});
+
+	/// \brief	Parses a TOML document from a string view.
+	///
+	/// \detail \cpp
+	/// auto tbl = toml::parse("a = 3"sv, "foo.toml");
+	/// std::cout << tbl["a"] << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// 3
+	/// \eout
+	///
+	/// \param 	doc				The TOML document to parse. Must be valid UTF-8.
+	/// \param 	source_path		The path used to initialize each node's `source().path`.
+	/// 						If you don't have a path (or you have no intention of using paths in diagnostics)
+	/// 						then this parameter can safely be left blank.
+	///
+	/// \returns	\conditional_return{With exceptions}
+	///				A toml::table.
+	/// 			\conditional_return{Without exceptions}
+	///				A toml::parse_result.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	parse_result TOML_CALLCONV parse(std::string_view doc, std::string && source_path);
+
+	/// \brief	Parses a TOML document from a file.
+	///
+	/// \detail \cpp
+	/// toml::parse_result get_foo_toml()
+	/// {
+	///		return toml::parse_file("foo.toml");
+	/// }
+	/// \ecpp
+	///
+	/// \param 	file_path		The TOML document to parse. Must be valid UTF-8.
+	///
+	/// \returns	\conditional_return{With exceptions}
+	///				A toml::table.
+	/// 			\conditional_return{Without exceptions}
+	///				A toml::parse_result.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	parse_result TOML_CALLCONV parse_file(std::string_view file_path);
+
+#if TOML_HAS_CHAR8
+
+	/// \brief	Parses a TOML document from a char8_t string view.
+	///
+	/// \detail \cpp
+	/// auto tbl = toml::parse(u8"a = 3"sv);
+	/// std::cout << tbl["a"] << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// 3
+	/// \eout
+	///
+	/// \param 	doc				The TOML document to parse. Must be valid UTF-8.
+	/// \param 	source_path		The path used to initialize each node's `source().path`.
+	/// 						If you don't have a path (or you have no intention of using paths in diagnostics)
+	/// 						then this parameter can safely be left blank.
+	///
+	/// \returns	\conditional_return{With exceptions}
+	///				A toml::table.
+	/// 			\conditional_return{Without exceptions}
+	///				A toml::parse_result.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	parse_result TOML_CALLCONV parse(std::u8string_view doc, std::string_view source_path = {});
+
+	/// \brief	Parses a TOML document from a char8_t string view.
+	///
+	/// \detail \cpp
+	/// auto tbl = toml::parse(u8"a = 3"sv, "foo.toml");
+	/// std::cout << tbl["a"] << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// 3
+	/// \eout
+	///
+	/// \param 	doc				The TOML document to parse. Must be valid UTF-8.
+	/// \param 	source_path		The path used to initialize each node's `source().path`.
+	/// 						If you don't have a path (or you have no intention of using paths in diagnostics)
+	/// 						then this parameter can safely be left blank.
+	///
+	/// \returns	\conditional_return{With exceptions}
+	///				A toml::table.
+	/// 			\conditional_return{Without exceptions}
+	///				A toml::parse_result.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	parse_result TOML_CALLCONV parse(std::u8string_view doc, std::string && source_path);
+
+	/// \brief	Parses a TOML document from a file.
+	///
+	/// \detail \cpp
+	/// toml::parse_result get_foo_toml()
+	/// {
+	///		return toml::parse_file(u8"foo.toml");
+	/// }
+	/// \ecpp
+	///
+	/// \param 	file_path		The TOML document to parse. Must be valid UTF-8.
+	///
+	/// \returns	\conditional_return{With exceptions}
+	///				A toml::table.
+	/// 			\conditional_return{Without exceptions}
+	///				A toml::parse_result.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	parse_result TOML_CALLCONV parse_file(std::u8string_view file_path);
+
+#endif // TOML_HAS_CHAR8
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+	/// \brief	Parses a TOML document from a string view.
+	///
+	/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+	///
+	/// \detail \cpp
+	/// auto tbl = toml::parse("a = 3"sv, L"foo.toml");
+	/// std::cout << tbl["a"] << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// 3
+	/// \eout
+	///
+	/// \param 	doc				The TOML document to parse. Must be valid UTF-8.
+	/// \param 	source_path		The path used to initialize each node's `source().path`.
+	/// 						If you don't have a path (or you have no intention of using paths in diagnostics)
+	/// 						then this parameter can safely be left blank.
+	///
+	/// \returns	\conditional_return{With exceptions}
+	///				A toml::table.
+	/// 			\conditional_return{Without exceptions}
+	///				A toml::parse_result.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	parse_result TOML_CALLCONV parse(std::string_view doc, std::wstring_view source_path);
+
+	/// \brief	Parses a TOML document from a stream.
+	///
+	/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+	///
+	/// \detail \cpp
+	/// std::stringstream ss;
+	/// ss << "a = 3"sv;
+	///
+	/// auto tbl = toml::parse(ss);
+	/// std::cout << tbl["a"] << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// 3
+	/// \eout
+	///
+	/// \param 	doc				The TOML document to parse. Must be valid UTF-8.
+	/// \param 	source_path		The path used to initialize each node's `source().path`.
+	/// 						If you don't have a path (or you have no intention of using paths in diagnostics)
+	/// 						then this parameter can safely be left blank.
+	///
+	/// \returns	\conditional_return{With exceptions}
+	///				A toml::table.
+	/// 			\conditional_return{Without exceptions}
+	///				A toml::parse_result.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	parse_result TOML_CALLCONV parse(std::istream & doc, std::wstring_view source_path);
+
+	/// \brief	Parses a TOML document from a file.
+	///
+	/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+	///
+	/// \detail \cpp
+	/// toml::parse_result get_foo_toml()
+	/// {
+	///		return toml::parse_file(L"foo.toml");
+	/// }
+	/// \ecpp
+	///
+	/// \param 	file_path		The TOML document to parse. Must be valid UTF-8.
+	///
+	/// \returns	\conditional_return{With exceptions}
+	///				A toml::table.
+	/// 			\conditional_return{Without exceptions}
+	///				A toml::parse_result.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	parse_result TOML_CALLCONV parse_file(std::wstring_view file_path);
+
+#endif // TOML_ENABLE_WINDOWS_COMPAT
+
+#if TOML_HAS_CHAR8 && TOML_ENABLE_WINDOWS_COMPAT
+
+	/// \brief	Parses a TOML document from a char8_t string view.
+	///
+	/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+	///
+	/// \detail \cpp
+	/// auto tbl = toml::parse(u8"a = 3"sv, L"foo.toml");
+	/// std::cout << tbl["a"] << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// 3
+	/// \eout
+	///
+	/// \param 	doc				The TOML document to parse. Must be valid UTF-8.
+	/// \param 	source_path		The path used to initialize each node's `source().path`.
+	/// 						If you don't have a path (or you have no intention of using paths in diagnostics)
+	/// 						then this parameter can safely be left blank.
+	///
+	/// \returns	\conditional_return{With exceptions}
+	///				A toml::table.
+	/// 			\conditional_return{Without exceptions}
+	///				A toml::parse_result.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	parse_result TOML_CALLCONV parse(std::u8string_view doc, std::wstring_view source_path);
+
+#endif // TOML_HAS_CHAR8 && TOML_ENABLE_WINDOWS_COMPAT
+
+	/// \brief	Parses a TOML document from a stream.
+	///
+	/// \detail \cpp
+	/// std::stringstream ss;
+	/// ss << "a = 3"sv;
+	///
+	/// auto tbl = toml::parse(ss);
+	/// std::cout << tbl["a"] << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// 3
+	/// \eout
+	///
+	/// \param 	doc				The TOML document to parse. Must be valid UTF-8.
+	/// \param 	source_path		The path used to initialize each node's `source().path`.
+	/// 						If you don't have a path (or you have no intention of using paths in diagnostics)
+	/// 						then this parameter can safely be left blank.
+	///
+	/// \returns	\conditional_return{With exceptions}
+	///				A toml::table.
+	/// 			\conditional_return{Without exceptions}
+	///				A toml::parse_result.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	parse_result TOML_CALLCONV parse(std::istream & doc, std::string_view source_path = {});
+
+	/// \brief	Parses a TOML document from a stream.
+	///
+	/// \detail \cpp
+	/// std::stringstream ss;
+	/// ss << "a = 3"sv;
+	///
+	/// auto tbl = toml::parse(ss, "foo.toml");
+	/// std::cout << tbl["a"] << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// 3
+	/// \eout
+	///
+	/// \param 	doc				The TOML document to parse. Must be valid UTF-8.
+	/// \param 	source_path		The path used to initialize each node's `source().path`.
+	/// 						If you don't have a path (or you have no intention of using paths in diagnostics)
+	/// 						then this parameter can safely be left blank.
+	///
+	/// \returns	\conditional_return{With exceptions}
+	///				A toml::table.
+	/// 			\conditional_return{Without exceptions}
+	///				A toml::parse_result.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	parse_result TOML_CALLCONV parse(std::istream & doc, std::string && source_path);
+
+	TOML_ABI_NAMESPACE_END; // TOML_EXCEPTIONS
+
+	inline namespace literals
+	{
+		TOML_ABI_NAMESPACE_BOOL(TOML_EXCEPTIONS, lit_ex, lit_noex);
+
+		/// \brief	Parses TOML data from a string literal.
+		///
+		/// \detail \cpp
+		/// using namespace toml::literals;
+		///
+		/// auto tbl = "a = 3"_toml;
+		/// std::cout << tbl["a"] << "\n";
+		/// \ecpp
+		///
+		/// \out
+		/// 3
+		/// \eout
+		///
+		/// \param 	str	The string data. Must be valid UTF-8.
+		/// \param 	len	The string length.
+		///
+		/// \returns	\conditional_return{With exceptions}
+		///				A toml::table.
+		/// 			\conditional_return{Without exceptions}
+		///				A toml::parse_result.
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		parse_result operator"" _toml(const char* str, size_t len)
+		{
+			return parse(std::string_view{ str, len });
+		}
+
+#if TOML_HAS_CHAR8
+
+		/// \brief	Parses TOML data from a UTF-8 string literal.
+		///
+		/// \detail \cpp
+		/// using namespace toml::literals;
+		///
+		/// auto tbl = u8"a = 3"_toml;
+		/// std::cout << tbl["a"] << "\n";
+		/// \ecpp
+		///
+		/// \out
+		/// 3
+		/// \eout
+		///
+		/// \param 	str	The string data. Must be valid UTF-8.
+		/// \param 	len	The string length.
+		///
+		/// \returns	\conditional_return{With exceptions}
+		///				A toml::table.
+		/// 			\conditional_return{Without exceptions}
+		///				A toml::parse_result.
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		parse_result operator"" _toml(const char8_t* str, size_t len)
+		{
+			return parse(std::u8string_view{ str, len });
+		}
+
+#endif // TOML_HAS_CHAR8
+
+		TOML_ABI_NAMESPACE_END; // TOML_EXCEPTIONS
+	}
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"
+#endif // TOML_ENABLE_PARSER

third_party/toml++/include/toml++/impl/path.hpp

@@ -0,0 +1,851 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "forward_declarations.hpp"
+#include "std_vector.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	/// \brief Indicates type of path component, either a key, an index in an array, or invalid
+	enum class TOML_CLOSED_ENUM path_component_type : uint8_t
+	{
+		key			= 0x1,
+		array_index = 0x2
+	};
+
+	/// \brief Represents a single component of a complete 'TOML-path': either a key or an array index
+	class TOML_EXPORTED_CLASS path_component
+	{
+		/// \cond
+		struct storage_t
+		{
+			static constexpr size_t size =
+				(sizeof(size_t) < sizeof(std::string) ? sizeof(std::string) : sizeof(size_t));
+			static constexpr size_t align =
+				(alignof(size_t) < alignof(std::string) ? alignof(std::string) : alignof(size_t));
+
+			alignas(align) unsigned char bytes[size];
+		};
+		alignas(storage_t::align) mutable storage_t value_storage_;
+
+		path_component_type type_;
+
+		TOML_PURE_GETTER
+		TOML_EXPORTED_STATIC_FUNCTION
+		static bool TOML_CALLCONV equal(const path_component&, const path_component&) noexcept;
+
+		template <typename Type>
+		TOML_PURE_INLINE_GETTER
+		static Type* get_as(storage_t& s) noexcept
+		{
+			return TOML_LAUNDER(reinterpret_cast<Type*>(s.bytes));
+		}
+
+		static void store_key(std::string_view key, storage_t& storage_)
+		{
+			::new (static_cast<void*>(storage_.bytes)) std::string{ key };
+		}
+
+		static void store_index(size_t index, storage_t& storage_) noexcept
+		{
+			::new (static_cast<void*>(storage_.bytes)) std::size_t{ index };
+		}
+
+		void destroy() noexcept
+		{
+			if (type_ == path_component_type::key)
+				get_as<std::string>(value_storage_)->~basic_string();
+		}
+
+		TOML_NODISCARD
+		size_t& index_ref() noexcept
+		{
+			TOML_ASSERT_ASSUME(type_ == path_component_type::array_index);
+			return *get_as<size_t>(value_storage_);
+		}
+
+		TOML_NODISCARD
+		std::string& key_ref() noexcept
+		{
+			TOML_ASSERT_ASSUME(type_ == path_component_type::key);
+			return *get_as<std::string>(value_storage_);
+		}
+		/// \endcond
+
+	  public:
+		/// \brief	Default constructor (creates an empty key).
+		TOML_NODISCARD_CTOR
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path_component();
+
+		/// \brief	Constructor for a path component that is an array index
+		TOML_NODISCARD_CTOR
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path_component(size_t index) noexcept;
+
+		/// \brief	Constructor for a path component that is a key string
+		TOML_NODISCARD_CTOR
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path_component(std::string_view key);
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief	Constructor for a path component that is a key string
+		///
+		/// \availability This constructor is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_NODISCARD_CTOR
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path_component(std::wstring_view key);
+
+#endif
+
+		/// \brief	Copy constructor.
+		TOML_NODISCARD_CTOR
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path_component(const path_component& pc);
+
+		/// \brief	Move constructor.
+		TOML_NODISCARD_CTOR
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path_component(path_component&& pc) noexcept;
+
+		/// \brief	Copy-assignment operator.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path_component& operator=(const path_component& rhs);
+
+		/// \brief	Move-assignment operator.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path_component& operator=(path_component&& rhs) noexcept;
+
+		/// \brief Assigns an array index to this path component.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path_component& operator=(size_t new_index) noexcept;
+
+		/// \brief Assigns a path key to this path component.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path_component& operator=(std::string_view new_key);
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief Assigns a path key to this path component.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path_component& operator=(std::wstring_view new_key);
+
+#endif
+
+		/// \brief	Destructor.
+		~path_component() noexcept
+		{
+			destroy();
+		}
+
+		/// \name Array index accessors
+		/// \warning It is undefined behaviour to call these functions when the path component does not represent an array index.
+		/// Check #type() to determine the component's value type.
+		/// @{
+
+		/// \brief	Returns the array index (const lvalue overload).
+		TOML_PURE_GETTER
+		size_t index() const noexcept
+		{
+			TOML_ASSERT_ASSUME(type_ == path_component_type::array_index);
+			return *get_as<const size_t>(value_storage_);
+		}
+
+		/// \brief	Returns the array index (const lvalue).
+		TOML_PURE_INLINE_GETTER
+		explicit operator size_t() const noexcept
+		{
+			return index();
+		}
+
+		/// @}
+
+		/// \name Key accessors
+		/// \warning It is undefined behaviour to call these functions when the path component does not represent a key.
+		/// Check #type() to determine the component's value type.
+		/// @{
+
+		/// \brief	Returns the key string.
+		TOML_PURE_GETTER
+		const std::string& key() const noexcept
+		{
+			TOML_ASSERT_ASSUME(type_ == path_component_type::key);
+			return *get_as<const std::string>(value_storage_);
+		}
+
+		/// \brief	Returns the key string.
+		TOML_PURE_INLINE_GETTER
+		explicit operator const std::string&() const noexcept
+		{
+			return key();
+		}
+
+		/// @}
+
+		/// \brief Retrieve the type of this path component, either path_component::key or path_component::array_index
+		TOML_PURE_INLINE_GETTER
+		path_component_type type() const noexcept
+		{
+			return type_;
+		}
+
+		/// \name Equality
+		/// @{
+
+		/// \brief	Returns true if two path components represent the same key or array index.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator==(const path_component& lhs, const path_component& rhs) noexcept
+		{
+			return equal(lhs, rhs);
+		}
+
+		/// \brief	Returns true if two path components do not represent the same key or array index.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator!=(const path_component& lhs, const path_component& rhs) noexcept
+		{
+			return !equal(lhs, rhs);
+		}
+
+		/// @}
+	};
+
+	/// \brief	A TOML path.
+	///
+	/// \detail This type parses and represents a path to a TOML node. It validates
+	///         the syntax of the path but does not ensure that the path refers to
+	///         a valid node in any particular TOML document. If parsing fails,
+	///         the object will evaluate as 'falsy', and will be empty.
+	///
+	/// \cpp
+	/// toml::path the_path("animals.cats[1]");
+	///
+	/// // can use with tbl.at_path or operator[]
+	/// std::cout << "second cat: " << tbl[the_path] << "\n";
+	/// std::cout << "cats: " << tbl.at_path(the_path.parent_path()) << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// second cat: lion
+	/// cats: ['tiger', 'lion', 'puma']
+	/// \eout
+	class TOML_EXPORTED_CLASS path
+	{
+	  private:
+		/// \cond
+
+		std::vector<path_component> components_;
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print_to(std::ostream&) const;
+
+		TOML_PURE_GETTER
+		TOML_EXPORTED_STATIC_FUNCTION
+		static bool TOML_CALLCONV equal(const path&, const path&) noexcept;
+
+		/// \endcond
+
+	  public:
+		/// \brief	Default constructor.
+		TOML_NODISCARD_CTOR
+		path() noexcept = default;
+
+		/// \brief Construct a path by parsing from a string.
+		TOML_NODISCARD_CTOR
+		TOML_EXPORTED_MEMBER_FUNCTION
+		explicit path(std::string_view);
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief Construct a path by parsing from a string.
+		///
+		/// \availability This constructor is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_NODISCARD_CTOR
+		TOML_EXPORTED_MEMBER_FUNCTION
+		explicit path(std::wstring_view);
+
+#endif
+
+		/// \brief	Default destructor.
+		~path() noexcept = default;
+
+		/// \brief	Copy constructor.
+		TOML_NODISCARD_CTOR
+		path(const path&) = default;
+
+		/// \brief	Move constructor.
+		TOML_NODISCARD_CTOR
+		path(path&&) noexcept = default;
+
+		/// \brief Returns the number of components in the path.
+		TOML_PURE_INLINE_GETTER
+		size_t size() const noexcept
+		{
+			return components_.size();
+		}
+
+		/// \brief Returns true if the path has one or more components.
+		TOML_PURE_INLINE_GETTER
+		explicit operator bool() const noexcept
+		{
+			return !components_.empty();
+		}
+
+		/// \brief Whether (true) or not (false) the path is empty
+		TOML_PURE_INLINE_GETTER
+		bool empty() const noexcept
+		{
+			return components_.empty();
+		}
+
+		/// \brief Fetch a path component by index.
+		TOML_PURE_INLINE_GETTER
+		path_component& operator[](size_t index) noexcept
+		{
+			TOML_ASSERT(index < size());
+			return components_[index];
+		}
+
+		/// \brief Fetch a path component by index (const overload).
+		TOML_PURE_INLINE_GETTER
+		const path_component& operator[](size_t index) const noexcept
+		{
+			TOML_ASSERT(index < size());
+			return components_[index];
+		}
+
+		/// \name Assignment
+		/// @{
+
+		/// \brief	Copy-assignment operator.
+		path& operator=(const path&) = default;
+
+		/// \brief	Move-assignment operator.
+		path& operator=(path&&) noexcept = default;
+
+		/// \brief	Replaces the contents of the path by parsing from a string.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path& operator=(std::string_view);
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief	Replaces the contents of the path by parsing from a string.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path& operator=(std::wstring_view);
+
+#endif
+
+		/// \brief	Replaces the contents of the path with that of another.
+		TOML_ALWAYS_INLINE
+		path& assign(const path& p)
+		{
+			return *this = p;
+		}
+
+		/// \brief	Replaces the contents of the path with that of another.
+		TOML_ALWAYS_INLINE
+		path& assign(path&& p) noexcept
+		{
+			return *this = std::move(p);
+		}
+
+		/// \brief	Replaces the contents of the path object by a new path
+		TOML_ALWAYS_INLINE
+		path& assign(std::string_view str)
+		{
+			return *this = str;
+		}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief	Replaces the contents of the path object by a new path
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_ALWAYS_INLINE
+		path& assign(std::wstring_view str)
+		{
+			return *this = str;
+		}
+
+#endif
+
+		/// @}
+
+		/// \name Appending
+		/// @{
+
+		/// \brief	Appends another path onto the end of this one.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path& operator+=(const path&);
+
+		/// \brief	Appends another path onto the end of this one.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path& operator+=(path&&);
+
+		/// \brief	Parses a path and appends it onto the end of this one.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path& operator+=(std::string_view);
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief	Parses a path and appends it onto the end of this one.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path& operator+=(std::wstring_view);
+
+#endif
+
+		/// \brief	Appends another path onto the end of this one.
+		TOML_ALWAYS_INLINE
+		path& append(const path& p)
+		{
+			return *this += p;
+		}
+
+		/// \brief	Appends another path onto the end of this one.
+		TOML_ALWAYS_INLINE
+		path& append(path&& p)
+		{
+			return *this += std::move(p);
+		}
+
+		/// \brief	Parses a path and appends it onto the end of this one.
+		TOML_ALWAYS_INLINE
+		path& append(std::string_view str)
+		{
+			return *this += str;
+		}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief	Parses a path and appends it onto the end of this one.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_ALWAYS_INLINE
+		path& append(std::wstring_view str)
+		{
+			return *this += str;
+		}
+
+#endif
+
+		/// @}
+
+		/// \name Prepending
+		/// @{
+
+		/// \brief	Prepends another path onto the beginning of this one.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path& prepend(const path&);
+
+		/// \brief	Prepends another path onto the beginning of this one.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path& prepend(path&&);
+
+		/// \brief	Parses a path and prepends it onto the beginning of this one.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path& prepend(std::string_view);
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief	Parses a path and prepends it onto the beginning of this one.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path& prepend(std::wstring_view);
+
+#endif
+
+		/// @}
+
+		/// \name Concatenation
+		/// @{
+
+		/// \brief  Concatenates two paths.
+		TOML_NODISCARD
+		friend path operator+(const path& lhs, const path& rhs)
+		{
+			path result = lhs;
+			result += rhs;
+			return result;
+		}
+
+		/// \brief  Concatenates two paths.
+		TOML_NODISCARD
+		friend path operator+(const path& lhs, std::string_view rhs)
+		{
+			path result = lhs;
+			result += rhs;
+			return result;
+		}
+
+		/// \brief  Concatenates two paths.
+		TOML_NODISCARD
+		friend path operator+(std::string_view lhs, const path& rhs)
+		{
+			path result = rhs;
+			result.prepend(lhs);
+			return result;
+		}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief  Concatenates two paths.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_NODISCARD
+		friend path operator+(const path& lhs, std::wstring_view rhs)
+		{
+			path result = lhs;
+			result += rhs;
+			return result;
+		}
+
+		/// \brief  Concatenates two paths.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_NODISCARD
+		friend path operator+(std::wstring_view lhs, const path& rhs)
+		{
+			path result = rhs;
+			result.prepend(lhs);
+			return result;
+		}
+
+#endif
+
+		/// @}
+
+		/// \name String conversion
+		/// @{
+
+		/// \brief	Prints the string representation of a #toml::path out to a stream.
+		TOML_ALWAYS_INLINE
+		friend std::ostream& operator<<(std::ostream& os, const path& rhs)
+		{
+			rhs.print_to(os);
+			return os;
+		}
+
+		/// \brief Returns a string representation of this path.
+		TOML_NODISCARD
+		TOML_EXPORTED_MEMBER_FUNCTION
+		std::string str() const;
+
+		/// \brief Returns a string representation of this path.
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		explicit operator std::string() const
+		{
+			return str();
+		}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief Returns a string representation of this path.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_NODISCARD
+		TOML_EXPORTED_MEMBER_FUNCTION
+		std::wstring wide_str() const;
+
+		/// \brief Returns a string representation of this path.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		explicit operator std::wstring() const
+		{
+			return wide_str();
+		}
+
+#endif
+
+		/// @}
+
+		/// \name Equality
+		/// @{
+
+		/// \brief Returns whether two paths are the same.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator==(const path& lhs, const path& rhs) noexcept
+		{
+			return equal(lhs, rhs);
+		}
+
+		/// \brief Returns whether two paths are not the same.
+		TOML_PURE_INLINE_GETTER
+		friend bool operator!=(const path& lhs, const path& rhs) noexcept
+		{
+			return !equal(lhs, rhs);
+		}
+
+		/// \brief Returns whether two paths are the same.
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		friend bool operator==(const path& lhs, std::string_view rhs)
+		{
+			return lhs == path{ rhs };
+		}
+
+		/// \brief Returns whether two paths are the same.
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		friend bool operator==(std::string_view lhs, const path& rhs)
+		{
+			return rhs == lhs;
+		}
+
+		/// \brief Returns whether two paths are not the same.
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		friend bool operator!=(const path& lhs, std::string_view rhs)
+		{
+			return lhs != path{ rhs };
+		}
+
+		/// \brief Returns whether two paths are not the same.
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		friend bool operator!=(std::string_view lhs, const path& rhs)
+		{
+			return rhs != lhs;
+		}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief Returns whether two paths are the same.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		friend bool operator==(const path& lhs, std::wstring_view rhs)
+		{
+			return lhs == path{ rhs };
+		}
+
+		/// \brief Returns whether two paths are the same.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		friend bool operator==(std::wstring_view lhs, const path& rhs)
+		{
+			return rhs == lhs;
+		}
+
+		/// \brief Returns whether two paths are not the same.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		friend bool operator!=(const path& lhs, std::wstring_view rhs)
+		{
+			return lhs != path{ rhs };
+		}
+
+		/// \brief Returns whether two paths are not the same.
+		///
+		/// \availability This overload is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		friend bool operator!=(std::wstring_view lhs, const path& rhs)
+		{
+			return rhs != lhs;
+		}
+
+#endif // TOML_ENABLE_WINDOWS_COMPAT
+
+		/// @}
+
+		/// \name Iteration
+		/// @{
+
+		/// An iterator for iterating over the components in the path.
+		/// \see #toml::path_component
+		using iterator = std::vector<path_component>::iterator;
+
+		/// A const iterator for iterating over the components in the path.
+		/// \see #toml::path_component
+		using const_iterator = std::vector<path_component>::const_iterator;
+
+		/// \brief  Returns an iterator to the first component in the path.
+		/// \see #toml::path_component
+		TOML_PURE_INLINE_GETTER
+		iterator begin() noexcept
+		{
+			return components_.begin();
+		}
+
+		/// \brief  Returns an iterator to one-past-the-last component in the path.
+		/// \see #toml::path_component
+		TOML_PURE_INLINE_GETTER
+		iterator end() noexcept
+		{
+			return components_.end();
+		}
+
+		/// \brief  Returns a const iterator to the first component in the path.
+		/// \see #toml::path_component
+		TOML_PURE_INLINE_GETTER
+		const_iterator begin() const noexcept
+		{
+			return components_.begin();
+		}
+
+		/// \brief  Returns a const iterator to one-past-the-last component in the path.
+		/// \see #toml::path_component
+		TOML_PURE_INLINE_GETTER
+		const_iterator end() const noexcept
+		{
+			return components_.end();
+		}
+
+		/// \brief  Returns a const iterator to the first component in the path.
+		/// \see #toml::path_component
+		TOML_PURE_INLINE_GETTER
+		const_iterator cbegin() const noexcept
+		{
+			return components_.begin();
+		}
+
+		/// \brief  Returns a const iterator to one-past-the-last component in the path.
+		/// \see #toml::path_component
+		TOML_PURE_INLINE_GETTER
+		const_iterator cend() const noexcept
+		{
+			return components_.end();
+		}
+
+		/// @}
+
+		/// \name Subpaths and Truncation
+		/// @{
+
+		/// \brief	Erases the contents of the path.
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void clear() noexcept;
+
+		/// \brief Removes the number of terminal path components specified by n
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path& truncate(size_t n);
+
+		/// \brief Returns a toml::path object which has had n terminal path components removed
+		TOML_NODISCARD
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path truncated(size_t n) const;
+
+		/// \brief	Returns a toml::path object representing the path of the parent node
+		TOML_NODISCARD
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path parent() const;
+
+		/// \brief	Returns a toml::path object representing terminal n-parts of a TOML path
+		TOML_NODISCARD
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path leaf(size_t n = 1) const;
+
+		/// \brief	Returns a toml::path object that is a specified subpath of the current path, representing the
+		/// range of path components from [start, end).
+		TOML_NODISCARD
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path subpath(const_iterator start, const_iterator end) const;
+
+		/// \brief	Returns a toml::path object that is a specified subpath of the current path, representing the
+		/// range of path components with indexes from [start, start + length].
+		TOML_NODISCARD
+		TOML_EXPORTED_MEMBER_FUNCTION
+		path subpath(size_t start, size_t length) const;
+
+		/// @}
+	};
+
+	inline namespace literals
+	{
+		/// \brief	Parses a TOML path from a string literal.
+		///
+		/// \detail \cpp
+		/// using namespace toml::literals;
+		///
+		/// auto path = "main.settings.devices[2]"_tpath;
+		/// std::cout << path.parent_path() << "\n";
+		/// \ecpp
+		///
+		/// \out
+		/// main.settings.devices
+		/// \eout
+		///
+		/// \param 	str	The string data.
+		/// \param 	len	The string length.
+		///
+		/// \returns	A #toml::path generated from the string literal.
+		TOML_NODISCARD
+		TOML_ALWAYS_INLINE
+		path operator"" _tpath(const char* str, size_t len)
+		{
+			return path(std::string_view{ str, len });
+		}
+	}
+
+	/// \brief Returns a view of the node matching a fully-qualified "TOML path".
+	///
+	/// \detail \cpp
+	/// auto config = toml::parse(R"(
+	///
+	/// [foo]
+	/// bar = [ 0, 1, 2, [ 3 ], { kek = 4 } ]
+	///
+	/// )"sv);
+	///
+	/// toml::path path1("foo.bar[2]");
+	/// toml::path path2("foo.bar[4].kek");
+	/// std::cout << toml::at_path(config, path1) << "\n";
+	/// std::cout << toml::at_path(config, path1.parent_path()) << "\n";
+	/// std::cout << toml::at_path(config, path2) << "\n";
+	/// std::cout << toml::at_path(config, path2.parent_path()) << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// 2
+	/// [ 0, 1, 2, [ 3 ], { kek = 4 } ]
+	/// 4
+	/// { kek  = 4 }
+	/// \eout
+	///
+	///
+	/// \note Keys in paths are interpreted literally, so whitespace (or lack thereof) matters:
+	/// \cpp
+	/// toml::at_path(config, toml::path("foo.bar"))  // same as config["foo"]["bar"]
+	/// toml::at_path(config, toml::path("foo. bar")) // same as config["foo"][" bar"]
+	/// toml::at_path(config, toml::path("foo..bar")) // same as config["foo"][""]["bar"]
+	/// toml::at_path(config, toml::path(".foo.bar")) // same as config[""]["foo"]["bar"]
+	/// \ecpp
+	/// <br>
+	/// Additionally, TOML allows '.' (period) characters to appear in keys if they are quoted strings.
+	/// This function makes no allowance for this, instead treating all period characters as sub-table delimiters.
+	///
+	/// \param root		The root node from which the path will be traversed.
+	/// \param path		The "TOML path" to traverse.
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	node_view<node> TOML_CALLCONV at_path(node & root, const toml::path& path) noexcept;
+
+	/// \brief Returns a const view of the node matching a fully-qualified "TOML path".
+	///
+	/// \see #toml::at_path(node&, const toml::path& path)
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	node_view<const node> TOML_CALLCONV at_path(const node& root, const toml::path& path) noexcept;
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/path.inl

@@ -0,0 +1,523 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+//# {{
+#include "preprocessor.hpp"
+#if !TOML_IMPLEMENTATION
+#error This is an implementation-only header.
+#endif
+//# }}
+
+#include "path.hpp"
+#include "at_path.hpp"
+#include "print_to_stream.hpp"
+TOML_DISABLE_WARNINGS;
+#if TOML_INT_CHARCONV
+#include <charconv>
+#endif
+#include <sstream>
+TOML_ENABLE_WARNINGS;
+#include "header_start.hpp"
+
+//#=====================================================================================================================
+//# toml::path_component
+//#=====================================================================================================================
+
+TOML_NAMESPACE_START
+{
+	TOML_EXTERNAL_LINKAGE
+	path_component::path_component() //
+		: type_{ path_component_type::key }
+	{
+		store_key("", value_storage_);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path_component::path_component(size_t index) noexcept //
+		: type_(path_component_type::array_index)
+	{
+		store_index(index, value_storage_);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path_component::path_component(std::string_view key) //
+		: type_(path_component_type::key)
+	{
+		store_key(key, value_storage_);
+	}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+	TOML_EXTERNAL_LINKAGE
+	path_component::path_component(std::wstring_view key) //
+		: path_component(impl::narrow(key))
+	{}
+
+#endif
+
+	TOML_EXTERNAL_LINKAGE
+	path_component::path_component(const path_component& pc) //
+		: type_{ pc.type_ }
+	{
+		if (type_ == path_component_type::array_index)
+			store_index(pc.index(), value_storage_);
+		else
+			store_key(pc.key(), value_storage_);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path_component::path_component(path_component && pc) noexcept //
+		: type_{ pc.type_ }
+	{
+		if (type_ == path_component_type::array_index)
+			store_index(pc.index_ref(), value_storage_);
+		else
+			store_key(std::move(pc.key_ref()), value_storage_);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path_component& path_component::operator=(const path_component& rhs)
+	{
+		if (type_ != rhs.type_)
+		{
+			destroy();
+
+			type_ = rhs.type_;
+			if (type_ == path_component_type::array_index)
+				store_index(rhs.index(), value_storage_);
+			else
+				store_key(rhs.key(), value_storage_);
+		}
+		else
+		{
+			if (type_ == path_component_type::array_index)
+				index_ref() = rhs.index();
+			else
+				key_ref() = rhs.key();
+		}
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path_component& path_component::operator=(path_component&& rhs) noexcept
+	{
+		if (type_ != rhs.type_)
+		{
+			destroy();
+
+			type_ = rhs.type_;
+			if (type_ == path_component_type::array_index)
+				store_index(rhs.index(), value_storage_);
+			else
+				store_key(std::move(rhs.key_ref()), value_storage_);
+		}
+		else
+		{
+			if (type_ == path_component_type::array_index)
+				index_ref() = rhs.index();
+			else
+				key_ref() = std::move(rhs.key_ref());
+		}
+		return *this;
+	}
+
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	bool TOML_CALLCONV path_component::equal(const path_component& lhs, const path_component& rhs) noexcept
+	{
+		// Different comparison depending on contents
+		if (lhs.type_ != rhs.type_)
+			return false;
+
+		if (lhs.type_ == path_component_type::array_index)
+			return lhs.index() == rhs.index();
+		else // path_component_type::key
+			return lhs.key() == rhs.key();
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path_component& path_component::operator=(size_t new_index) noexcept
+	{
+		// If currently a key, string will need to be destroyed regardless
+		destroy();
+
+		type_ = path_component_type::array_index;
+		store_index(new_index, value_storage_);
+
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path_component& path_component::operator=(std::string_view new_key)
+	{
+		if (type_ == path_component_type::key)
+			key_ref() = new_key;
+		else
+		{
+			type_ = path_component_type::key;
+			store_key(new_key, value_storage_);
+		}
+
+		return *this;
+	}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+	TOML_EXTERNAL_LINKAGE
+	path_component& path_component::operator=(std::wstring_view new_key)
+	{
+		if (type_ == path_component_type::key)
+			key_ref() = impl::narrow(new_key);
+		else
+		{
+			type_ = path_component_type::key;
+			store_key(impl::narrow(new_key), value_storage_);
+		}
+
+		return *this;
+	}
+
+#endif
+}
+TOML_NAMESPACE_END;
+
+//#=====================================================================================================================
+//# toml::path
+//#=====================================================================================================================
+
+TOML_ANON_NAMESPACE_START
+{
+	TOML_INTERNAL_LINKAGE
+	bool parse_path_into(std::string_view path_str, std::vector<path_component> & components)
+	{
+		using components_type = std::remove_reference_t<decltype(components)>;
+
+		const auto original_size = components.size();
+
+		static constexpr auto on_key = [](void* data, std::string_view key) -> bool
+		{
+			auto& comps = *static_cast<components_type*>(data);
+			comps.emplace_back(key);
+			return true;
+		};
+
+		static constexpr auto on_index = [](void* data, size_t index) -> bool
+		{
+			auto& comps = *static_cast<components_type*>(data);
+			comps.emplace_back(index);
+			return true;
+		};
+
+		if (!impl::parse_path(path_str, &components, on_key, on_index))
+		{
+			components.resize(original_size);
+			return false;
+		}
+
+		return true;
+	}
+}
+TOML_ANON_NAMESPACE_END;
+
+TOML_NAMESPACE_START
+{
+	TOML_EXTERNAL_LINKAGE
+	void path::print_to(std::ostream & os) const
+	{
+		bool root = true;
+		for (const auto& component : components_)
+		{
+			if (component.type() == path_component_type::key) // key
+			{
+				if (!root)
+					impl::print_to_stream(os, '.');
+				impl::print_to_stream(os, component.key());
+			}
+			else if (component.type() == path_component_type::array_index) // array
+			{
+				impl::print_to_stream(os, '[');
+				impl::print_to_stream(os, component.index());
+				impl::print_to_stream(os, ']');
+			}
+			root = false;
+		}
+	}
+
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	bool TOML_CALLCONV path::equal(const path& lhs, const path& rhs) noexcept
+	{
+		return lhs.components_ == rhs.components_;
+	}
+
+	//#=== constructors =================================================
+
+	TOML_EXTERNAL_LINKAGE
+	path::path(std::string_view str) //
+	{
+		TOML_ANON_NAMESPACE::parse_path_into(str, components_);
+	}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+	TOML_EXTERNAL_LINKAGE
+	path::path(std::wstring_view str) //
+		: path(impl::narrow(str))
+	{}
+
+#endif
+
+	//#=== assignment =================================================
+
+	TOML_EXTERNAL_LINKAGE
+	path& path::operator=(std::string_view rhs)
+	{
+		components_.clear();
+		TOML_ANON_NAMESPACE::parse_path_into(rhs, components_);
+		return *this;
+	}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+	TOML_EXTERNAL_LINKAGE
+	path& path::operator=(std::wstring_view rhs)
+	{
+		return assign(impl::narrow(rhs));
+	}
+
+#endif
+
+	//#=== appending =================================================
+
+	TOML_EXTERNAL_LINKAGE
+	path& path::operator+=(const path& rhs)
+	{
+		components_.insert(components_.cend(), rhs.begin(), rhs.end());
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path& path::operator+=(path&& rhs)
+	{
+		components_.insert(components_.end(),
+						   std::make_move_iterator(rhs.components_.begin()),
+						   std::make_move_iterator(rhs.components_.end()));
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path& path::operator+=(std::string_view str)
+	{
+		TOML_ANON_NAMESPACE::parse_path_into(str, components_);
+		return *this;
+	}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+	TOML_EXTERNAL_LINKAGE
+	path& path::operator+=(std::wstring_view str)
+	{
+		return *this += impl::narrow(str);
+	}
+
+#endif
+
+	//#=== prepending =================================================
+
+	TOML_EXTERNAL_LINKAGE
+	path& path::prepend(const path& source)
+	{
+		components_.insert(components_.begin(), source.components_.begin(), source.components_.end());
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path& path::prepend(path && source)
+	{
+		components_.insert(components_.begin(),
+						   std::make_move_iterator(source.components_.begin()),
+						   std::make_move_iterator(source.components_.end()));
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path& path::prepend(std::string_view source)
+	{
+		return prepend(path{ source });
+	}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+	TOML_EXTERNAL_LINKAGE
+	path& path::prepend(std::wstring_view source)
+	{
+		return prepend(impl::narrow(source));
+	}
+
+#endif
+
+	//#=== string conversion =================================================
+
+	TOML_EXTERNAL_LINKAGE
+	std::string path::str() const
+	{
+		if (empty())
+			return "";
+
+		std::ostringstream ss;
+		print_to(ss);
+		return std::move(ss).str();
+	}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+	TOML_EXTERNAL_LINKAGE
+	std::wstring path::wide_str() const
+	{
+		return impl::widen(str());
+	}
+
+#endif
+
+	//#=== equality and comparison =================================================
+
+	TOML_EXTERNAL_LINKAGE
+	void path::clear() noexcept
+	{
+		components_.clear();
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path& path::truncate(size_t n)
+	{
+		n = n > components_.size() ? components_.size() : n;
+
+		auto it_end = components_.end();
+		components_.erase(it_end - static_cast<int>(n), it_end);
+
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path path::truncated(size_t n) const
+	{
+		path truncated_path{};
+
+		n = n > components_.size() ? components_.size() : n;
+
+		// Copy all components except one
+		// Need at least two path components to have a parent, since if there is
+		// only one path component, the parent is the root/null path ""
+		truncated_path.components_.insert(truncated_path.components_.begin(),
+										  components_.begin(),
+										  components_.end() - static_cast<int>(n));
+
+		return truncated_path;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path path::parent() const
+	{
+		return truncated(1);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path path::leaf(size_t n) const
+	{
+		path leaf_path{};
+
+		n = n > components_.size() ? components_.size() : n;
+
+		if (n > 0)
+		{
+			leaf_path.components_.insert(leaf_path.components_.begin(),
+										 components_.end() - static_cast<int>(n),
+										 components_.end());
+		}
+
+		return leaf_path;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path path::subpath(std::vector<path_component>::const_iterator start,
+					   std::vector<path_component>::const_iterator end) const
+	{
+		if (start >= end)
+			return {};
+
+		path subpath;
+		subpath.components_.insert(subpath.components_.begin(), start, end);
+		return subpath;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	path path::subpath(size_t start, size_t length) const
+	{
+		return subpath(begin() + static_cast<int>(start), begin() + static_cast<int>(start + length));
+	}
+}
+TOML_NAMESPACE_END;
+
+//#=====================================================================================================================
+//# at_path() overloads for toml::path
+//#=====================================================================================================================
+
+TOML_NAMESPACE_START
+{
+	TOML_EXTERNAL_LINKAGE
+	node_view<node> TOML_CALLCONV at_path(node & root, const toml::path& path) noexcept
+	{
+		// early-exit sanity-checks
+		if (root.is_value())
+			return {};
+		if (auto tbl = root.as_table(); tbl && tbl->empty())
+			return {};
+		if (auto arr = root.as_array(); arr && arr->empty())
+			return {};
+
+		node* current = &root;
+
+		for (const auto& component : path)
+		{
+			auto type = component.type();
+			if (type == path_component_type::array_index)
+			{
+				const auto current_array = current->as<array>();
+				if (!current_array)
+					return {}; // not an array, using array index doesn't work
+
+				current = current_array->get(component.index());
+			}
+			else if (type == path_component_type::key)
+			{
+				const auto current_table = current->as<table>();
+				if (!current_table)
+					return {};
+
+				current = current_table->get(component.key());
+			}
+			else
+			{
+				// Error: invalid component
+				return {};
+			}
+
+			if (!current)
+				return {}; // not found
+		}
+
+		return node_view{ current };
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	node_view<const node> TOML_CALLCONV at_path(const node& root, const toml::path& path) noexcept
+	{
+		return node_view<const node>{ at_path(const_cast<node&>(root), path).node() };
+	}
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/print_to_stream.hpp

@@ -0,0 +1,129 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "std_string.hpp"
+#include "forward_declarations.hpp"
+#include "header_start.hpp"
+
+TOML_IMPL_NAMESPACE_START
+{
+	// Q: "why does print_to_stream() exist? why not just use ostream::write(), ostream::put() etc?"
+	// A: - I'm using <charconv> to format numerics. Faster and locale-independent.
+	//    - I can (potentially) avoid forcing users to drag in <sstream> and <iomanip>.
+	//    - Strings in C++. Honestly.
+
+	TOML_EXPORTED_FREE_FUNCTION
+	TOML_ATTR(nonnull)
+	void TOML_CALLCONV print_to_stream(std::ostream&, const char*, size_t);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, std::string_view);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const std::string&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, char);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, signed char, value_flags = {}, size_t min_digits = 0);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, signed short, value_flags = {}, size_t min_digits = 0);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, signed int, value_flags = {}, size_t min_digits = 0);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, signed long, value_flags = {}, size_t min_digits = 0);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, signed long long, value_flags = {}, size_t min_digits = 0);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, unsigned char, value_flags = {}, size_t min_digits = 0);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, unsigned short, value_flags = {}, size_t min_digits = 0);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, unsigned int, value_flags = {}, size_t min_digits = 0);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, unsigned long, value_flags = {}, size_t min_digits = 0);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, unsigned long long, value_flags = {}, size_t min_digits = 0);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, float, value_flags = {}, bool relaxed_precision = false);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, double, value_flags = {}, bool relaxed_precision = false);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, bool);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const toml::date&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const toml::time&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const toml::time_offset&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const toml::date_time&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const source_position&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const source_region&);
+
+#if TOML_ENABLE_FORMATTERS
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const array&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const table&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const value<std::string>&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const value<int64_t>&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const value<double>&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const value<bool>&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const value<date>&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const value<time>&);
+
+	TOML_EXPORTED_FREE_FUNCTION
+	void TOML_CALLCONV print_to_stream(std::ostream&, const value<date_time>&);
+
+#endif
+
+	template <typename T, typename U>
+	inline void print_to_stream_bookended(std::ostream & stream, const T& val, const U& bookend)
+	{
+		print_to_stream(stream, bookend);
+		print_to_stream(stream, val);
+		print_to_stream(stream, bookend);
+	}
+}
+TOML_IMPL_NAMESPACE_END;
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/print_to_stream.inl

@@ -0,0 +1,490 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+//# {{
+#include "preprocessor.hpp"
+#if !TOML_IMPLEMENTATION
+#error This is an implementation-only header.
+#endif
+//# }}
+
+#include "print_to_stream.hpp"
+#include "source_region.hpp"
+#include "date_time.hpp"
+#include "toml_formatter.hpp"
+#include "value.hpp"
+#include "array.hpp"
+#include "table.hpp"
+TOML_DISABLE_WARNINGS;
+#include <ostream>
+#if TOML_INT_CHARCONV || TOML_FLOAT_CHARCONV
+#include <charconv>
+#endif
+#if !TOML_INT_CHARCONV || !TOML_FLOAT_CHARCONV
+#include <sstream>
+#endif
+#if !TOML_INT_CHARCONV
+#include <iomanip>
+#endif
+TOML_ENABLE_WARNINGS;
+#include "header_start.hpp"
+
+TOML_ANON_NAMESPACE_START
+{
+	template <typename T>
+	inline constexpr size_t charconv_buffer_length = 0;
+
+	template <>
+	inline constexpr size_t charconv_buffer_length<int8_t> = 4; // strlen("-128")
+
+	template <>
+	inline constexpr size_t charconv_buffer_length<int16_t> = 6; // strlen("-32768")
+
+	template <>
+	inline constexpr size_t charconv_buffer_length<int32_t> = 11; // strlen("-2147483648")
+
+	template <>
+	inline constexpr size_t charconv_buffer_length<int64_t> = 20; // strlen("-9223372036854775808")
+
+	template <>
+	inline constexpr size_t charconv_buffer_length<uint8_t> = 3; // strlen("255")
+
+	template <>
+	inline constexpr size_t charconv_buffer_length<uint16_t> = 5; // strlen("65535")
+
+	template <>
+	inline constexpr size_t charconv_buffer_length<uint32_t> = 10; // strlen("4294967295")
+
+	template <>
+	inline constexpr size_t charconv_buffer_length<uint64_t> = 20; // strlen("18446744073709551615")
+
+	template <>
+	inline constexpr size_t charconv_buffer_length<float> = 64;
+
+	template <>
+	inline constexpr size_t charconv_buffer_length<double> = 64;
+
+	template <typename T>
+	TOML_INTERNAL_LINKAGE
+	void print_integer_to_stream(std::ostream & stream, T val, value_flags format = {}, size_t min_digits = 0)
+	{
+		if (!val)
+		{
+			if (!min_digits)
+				min_digits = 1;
+
+			for (size_t i = 0; i < min_digits; i++)
+				stream.put('0');
+
+			return;
+		}
+
+		static constexpr auto value_flags_mask =
+			value_flags::format_as_binary | value_flags::format_as_octal | value_flags::format_as_hexadecimal;
+		format &= value_flags_mask;
+
+		int base = 10;
+		if (format != value_flags::none && val > T{})
+		{
+			switch (format)
+			{
+				case value_flags::format_as_binary: base = 2; break;
+				case value_flags::format_as_octal: base = 8; break;
+				case value_flags::format_as_hexadecimal: base = 16; break;
+				default: break;
+			}
+		}
+
+#if TOML_INT_CHARCONV
+
+		char buf[(sizeof(T) * CHAR_BIT)];
+		const auto res = std::to_chars(buf, buf + sizeof(buf), val, base);
+		const auto len = static_cast<size_t>(res.ptr - buf);
+		for (size_t i = len; i < min_digits; i++)
+			stream.put('0');
+		if (base == 16)
+		{
+			for (size_t i = 0; i < len; i++)
+				if (buf[i] >= 'a')
+					buf[i] -= 32;
+		}
+		impl::print_to_stream(stream, buf, len);
+
+#else
+
+		using unsigned_type = std::conditional_t<(sizeof(T) > sizeof(unsigned)), std::make_unsigned_t<T>, unsigned>;
+		using cast_type		= std::conditional_t<std::is_signed_v<T>, std::make_signed_t<unsigned_type>, unsigned_type>;
+
+		if (base == 2)
+		{
+			const auto len = sizeof(T) * CHAR_BIT;
+			for (size_t i = len; i < min_digits; i++)
+				stream.put('0');
+
+			bool found_one	   = false;
+			const auto v	   = static_cast<unsigned_type>(val);
+			unsigned_type mask = unsigned_type{ 1 } << (len - 1u);
+			for (size_t i = 0; i < len; i++)
+			{
+				if ((v & mask))
+				{
+					stream.put('1');
+					found_one = true;
+				}
+				else if (found_one)
+					stream.put('0');
+				mask >>= 1;
+			}
+		}
+		else
+		{
+			std::ostringstream ss;
+			ss.imbue(std::locale::classic());
+			ss << std::uppercase << std::setbase(base);
+			if (min_digits)
+				ss << std::setfill('0') << std::setw(static_cast<int>(min_digits));
+			ss << static_cast<cast_type>(val);
+			const auto str = std::move(ss).str();
+			impl::print_to_stream(stream, str);
+		}
+
+#endif
+	}
+
+	template <typename T>
+	TOML_INTERNAL_LINKAGE
+	void print_floating_point_to_stream(std::ostream & stream,
+										T val,
+										value_flags format,
+										[[maybe_unused]] bool relaxed_precision)
+	{
+		switch (impl::fpclassify(val))
+		{
+			case impl::fp_class::neg_inf: impl::print_to_stream(stream, "-inf"sv); break;
+
+			case impl::fp_class::pos_inf: impl::print_to_stream(stream, "inf"sv); break;
+
+			case impl::fp_class::nan: impl::print_to_stream(stream, "nan"sv); break;
+
+			case impl::fp_class::ok:
+			{
+				static constexpr auto needs_decimal_point = [](auto&& s) noexcept
+				{
+					for (auto c : s)
+						if (c == '.' || c == 'E' || c == 'e')
+							return false;
+					return true;
+				};
+
+#if TOML_FLOAT_CHARCONV
+
+				const auto hex = !!(format & value_flags::format_as_hexadecimal);
+				char buf[charconv_buffer_length<T>];
+				auto res = hex ? std::to_chars(buf, buf + sizeof(buf), val, std::chars_format::hex)
+							   : std::to_chars(buf, buf + sizeof(buf), val);
+				auto str = std::string_view{ buf, static_cast<size_t>(res.ptr - buf) };
+
+				char buf2[charconv_buffer_length<T>];
+				if (!hex && relaxed_precision)
+				{
+					res				= std::to_chars(buf2, buf2 + sizeof(buf2), val, std::chars_format::general, 6);
+					const auto str2 = std::string_view{ buf2, static_cast<size_t>(res.ptr - buf2) };
+					if (str2.length() < str.length())
+						str = str2;
+				}
+
+				impl::print_to_stream(stream, str);
+				if (!hex && needs_decimal_point(str))
+					toml::impl::print_to_stream(stream, ".0"sv);
+
+#else
+
+				std::ostringstream ss;
+				ss.imbue(std::locale::classic());
+				if (!relaxed_precision)
+					ss.precision(std::numeric_limits<T>::max_digits10);
+				if (!!(format & value_flags::format_as_hexadecimal))
+					ss << std::hexfloat;
+				ss << val;
+				const auto str = std::move(ss).str();
+				impl::print_to_stream(stream, str);
+				if (!(format & value_flags::format_as_hexadecimal) && needs_decimal_point(str))
+					impl::print_to_stream(stream, ".0"sv);
+
+#endif
+			}
+			break;
+
+			default: TOML_UNREACHABLE;
+		}
+	}
+}
+TOML_ANON_NAMESPACE_END;
+
+TOML_IMPL_NAMESPACE_START
+{
+	TOML_EXTERNAL_LINKAGE
+	TOML_ATTR(nonnull)
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const char* val, size_t len)
+	{
+		stream.write(val, static_cast<std::streamsize>(len));
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, std::string_view val)
+	{
+		stream.write(val.data(), static_cast<std::streamsize>(val.length()));
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const std::string& val)
+	{
+		stream.write(val.data(), static_cast<std::streamsize>(val.length()));
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, char val)
+	{
+		stream.put(val);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, signed char val, value_flags format, size_t min_digits)
+	{
+		TOML_ANON_NAMESPACE::print_integer_to_stream(stream, val, format, min_digits);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, signed short val, value_flags format, size_t min_digits)
+	{
+		TOML_ANON_NAMESPACE::print_integer_to_stream(stream, val, format, min_digits);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, signed int val, value_flags format, size_t min_digits)
+	{
+		TOML_ANON_NAMESPACE::print_integer_to_stream(stream, val, format, min_digits);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, signed long val, value_flags format, size_t min_digits)
+	{
+		TOML_ANON_NAMESPACE::print_integer_to_stream(stream, val, format, min_digits);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream,
+									   signed long long val,
+									   value_flags format,
+									   size_t min_digits)
+	{
+		TOML_ANON_NAMESPACE::print_integer_to_stream(stream, val, format, min_digits);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, unsigned char val, value_flags format, size_t min_digits)
+	{
+		TOML_ANON_NAMESPACE::print_integer_to_stream(stream, val, format, min_digits);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, unsigned short val, value_flags format, size_t min_digits)
+	{
+		TOML_ANON_NAMESPACE::print_integer_to_stream(stream, val, format, min_digits);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, unsigned int val, value_flags format, size_t min_digits)
+	{
+		TOML_ANON_NAMESPACE::print_integer_to_stream(stream, val, format, min_digits);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, unsigned long val, value_flags format, size_t min_digits)
+	{
+		TOML_ANON_NAMESPACE::print_integer_to_stream(stream, val, format, min_digits);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream,
+									   unsigned long long val,
+									   value_flags format,
+									   size_t min_digits)
+	{
+		TOML_ANON_NAMESPACE::print_integer_to_stream(stream, val, format, min_digits);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, float val, value_flags format, bool relaxed_precision)
+	{
+		TOML_ANON_NAMESPACE::print_floating_point_to_stream(stream, val, format, relaxed_precision);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, double val, value_flags format, bool relaxed_precision)
+	{
+		TOML_ANON_NAMESPACE::print_floating_point_to_stream(stream, val, format, relaxed_precision);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, bool val)
+	{
+		print_to_stream(stream, val ? "true"sv : "false"sv);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const toml::date& val)
+	{
+		print_to_stream(stream, val.year, {}, 4);
+		stream.put('-');
+		print_to_stream(stream, val.month, {}, 2);
+		stream.put('-');
+		print_to_stream(stream, val.day, {}, 2);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const toml::time& val)
+	{
+		print_to_stream(stream, val.hour, {}, 2);
+		stream.put(':');
+		print_to_stream(stream, val.minute, {}, 2);
+		stream.put(':');
+		print_to_stream(stream, val.second, {}, 2);
+		if (val.nanosecond && val.nanosecond <= 999999999u)
+		{
+			stream.put('.');
+			auto ns		  = val.nanosecond;
+			size_t digits = 9u;
+			while (ns % 10u == 0u)
+			{
+				ns /= 10u;
+				digits--;
+			}
+			print_to_stream(stream, ns, {}, digits);
+		}
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const toml::time_offset& val)
+	{
+		if (!val.minutes)
+		{
+			stream.put('Z');
+			return;
+		}
+
+		auto mins = static_cast<int>(val.minutes);
+		if (mins < 0)
+		{
+			stream.put('-');
+			mins = -mins;
+		}
+		else
+			stream.put('+');
+		const auto hours = mins / 60;
+		if (hours)
+		{
+			print_to_stream(stream, static_cast<unsigned int>(hours), {}, 2);
+			mins -= hours * 60;
+		}
+		else
+			print_to_stream(stream, "00"sv);
+		stream.put(':');
+		print_to_stream(stream, static_cast<unsigned int>(mins), {}, 2);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const toml::date_time& val)
+	{
+		print_to_stream(stream, val.date);
+		stream.put('T');
+		print_to_stream(stream, val.time);
+		if (val.offset)
+			print_to_stream(stream, *val.offset);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const source_position& val)
+	{
+		print_to_stream(stream, "line "sv);
+		print_to_stream(stream, val.line);
+		print_to_stream(stream, ", column "sv);
+		print_to_stream(stream, val.column);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const source_region& val)
+	{
+		print_to_stream(stream, val.begin);
+		if (val.path)
+		{
+			print_to_stream(stream, " of '"sv);
+			print_to_stream(stream, *val.path);
+			stream.put('\'');
+		}
+	}
+
+#if TOML_ENABLE_FORMATTERS
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const array& arr)
+	{
+		stream << toml_formatter{ arr };
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const table& tbl)
+	{
+		stream << toml_formatter{ tbl };
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const value<std::string>& val)
+	{
+		stream << toml_formatter{ val };
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const value<int64_t>& val)
+	{
+		stream << toml_formatter{ val };
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const value<double>& val)
+	{
+		stream << toml_formatter{ val };
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const value<bool>& val)
+	{
+		stream << toml_formatter{ val };
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const value<date>& val)
+	{
+		stream << toml_formatter{ val };
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const value<time>& val)
+	{
+		stream << toml_formatter{ val };
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void TOML_CALLCONV print_to_stream(std::ostream & stream, const value<date_time>& val)
+	{
+		stream << toml_formatter{ val };
+	}
+
+#endif
+}
+TOML_IMPL_NAMESPACE_END;
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/simd.hpp

@@ -0,0 +1,35 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+#if TOML_ENABLE_SIMD
+
+#if defined(__SSE2__)                                                                                                  \
+	|| (defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_X64) || (defined(_M_IX86_FP) && _M_IX86_FP >= 2)))
+#define TOML_HAS_SSE2 1
+#endif
+
+#if defined(__SSE4_1__) || (defined(_MSC_VER) && (defined(__AVX__) || defined(__AVX2__)))
+#define TOML_HAS_SSE4_1 1
+#endif
+
+#endif // TOML_ENABLE_SIMD
+
+#ifndef TOML_HAS_SSE2
+#define TOML_HAS_SSE2 0
+#endif
+#ifndef TOML_HAS_SSE4_1
+#define TOML_HAS_SSE4_1 0
+#endif
+
+TOML_DISABLE_WARNINGS;
+#if TOML_HAS_SSE4_1
+#include <smmintrin.h>
+#endif
+#if TOML_HAS_SSE2
+#include <emmintrin.h>
+#endif
+TOML_ENABLE_WARNINGS;

third_party/toml++/include/toml++/impl/source_region.hpp

@@ -0,0 +1,223 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "std_optional.hpp"
+#include "std_string.hpp"
+#include "forward_declarations.hpp"
+#include "print_to_stream.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	/// \brief	The integer type used to tally line numbers and columns.
+	using source_index = uint32_t;
+
+	/// \brief	A pointer to a shared string resource containing a source path.
+	using source_path_ptr = std::shared_ptr<const std::string>;
+
+	/// \brief	A source document line-and-column pair.
+	///
+	/// \detail \cpp
+	/// auto table = toml::parse_file("config.toml"sv);
+	/// std::cout << "The node 'description' was defined at "sv
+	///		<< table.get("description")->source().begin()
+	///		<< "\n";
+	/// \ecpp
+	///
+	/// \out
+	///	The value 'description' was defined at line 7, column 15
+	/// \eout
+	///
+	/// \remarks toml++'s parser is unicode-aware insofar as it knows how to handle
+	/// 		 non-ASCII whitespace and newline characters, but it doesn't give much thought
+	///			 to combining marks, grapheme clusters vs. characters, et cetera.
+	/// 		 If a TOML document contains lots of codepoints outside of the ASCII range
+	/// 		 you may find that your source_positions don't match those given by a text editor
+	/// 		 (typically the line numbers will be accurate but column numbers will be too high).
+	/// 		 <strong>This is not an error.</strong> I've chosen this behaviour as a deliberate trade-off
+	/// 		 between parser complexity and correctness.
+	struct TOML_TRIVIAL_ABI source_position
+	{
+		/// \brief The line number.
+		/// \remarks Valid line numbers start at 1.
+		source_index line;
+
+		/// \brief The column number.
+		/// \remarks Valid column numbers start at 1.
+		source_index column;
+
+		/// \brief	Returns true if both line and column numbers are non-zero.
+		TOML_PURE_GETTER
+		explicit constexpr operator bool() const noexcept
+		{
+			return line > source_index{} //
+				&& column > source_index{};
+		}
+
+		/// \brief	Equality operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator==(const source_position& lhs, const source_position& rhs) noexcept
+		{
+			return lhs.line == rhs.line //
+				&& lhs.column == rhs.column;
+		}
+
+		/// \brief	Inequality operator.
+		TOML_PURE_INLINE_GETTER
+		friend constexpr bool operator!=(const source_position& lhs, const source_position& rhs) noexcept
+		{
+			return !(lhs == rhs);
+		}
+
+	  private:
+		/// \cond
+
+		TOML_PURE_GETTER
+		static constexpr uint64_t pack(const source_position& pos) noexcept
+		{
+			return static_cast<uint64_t>(pos.line) << 32 | static_cast<uint64_t>(pos.column);
+		}
+
+		/// \endcond
+
+	  public:
+		/// \brief	Less-than operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator<(const source_position& lhs, const source_position& rhs) noexcept
+		{
+			return pack(lhs) < pack(rhs);
+		}
+
+		/// \brief	Less-than-or-equal-to operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator<=(const source_position& lhs, const source_position& rhs) noexcept
+		{
+			return pack(lhs) <= pack(rhs);
+		}
+
+		/// \brief	Greater-than operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator>(const source_position& lhs, const source_position& rhs) noexcept
+		{
+			return pack(lhs) > pack(rhs);
+		}
+
+		/// \brief	Greater-than-or-equal-to operator.
+		TOML_PURE_GETTER
+		friend constexpr bool operator>=(const source_position& lhs, const source_position& rhs) noexcept
+		{
+			return pack(lhs) >= pack(rhs);
+		}
+
+		/// \brief	Prints a source_position to a stream.
+		///
+		/// \detail \cpp
+		/// auto tbl = toml::parse("bar = 42"sv);
+		///
+		/// std::cout << "The value for 'bar' was found on "sv
+		///		<< tbl.get("bar")->source().begin()
+		///		<< "\n";
+		/// \ecpp
+		///
+		/// \out
+		/// The value for 'bar' was found on line 1, column 7
+		/// \eout
+		///
+		/// \param 	lhs	The stream.
+		/// \param 	rhs	The source_position.
+		///
+		/// \returns	The input stream.
+		friend std::ostream& operator<<(std::ostream& lhs, const source_position& rhs)
+		{
+			impl::print_to_stream(lhs, rhs);
+			return lhs;
+		}
+	};
+
+	/// \brief	A source document region.
+	///
+	/// \detail \cpp
+	/// auto tbl = toml::parse_file("config.toml"sv);
+	/// if (auto server = tbl.get("server"))
+	/// {
+	///		std::cout << "begin: "sv << server->source().begin << "\n";
+	///		std::cout << "end: "sv << server->source().end << "\n";
+	///		std::cout << "path: "sv << *server->source().path << "\n";
+	///	}
+	/// \ecpp
+	///
+	/// \out
+	///	begin: line 3, column 1
+	///	end: line 3, column 22
+	///	path: config.toml
+	/// \eout
+	///
+	/// \remarks toml++'s parser is unicode-aware insofar as it knows how to handle
+	/// 		 non-ASCII whitespace and newline characters, but it doesn't give much thought
+	///			 to combining marks, grapheme clusters vs. characters, et cetera.
+	/// 		 If a TOML document contains lots of codepoints outside of the ASCII range
+	/// 		 you may find that your source_positions don't match those given by a text editor
+	/// 		 (typically the line numbers will be accurate but column numbers will be too high).
+	/// 		 <strong>This is not an error.</strong> I've chosen this behaviour as a deliberate trade-off
+	/// 		 between parser complexity and correctness.
+	struct source_region
+	{
+		/// \brief The beginning of the region (inclusive).
+		source_position begin;
+
+		/// \brief The end of the region (exclusive).
+		source_position end;
+
+		/// \brief	The path to the corresponding source document.
+		///
+		/// \remarks This will be `nullptr` if no path was provided to toml::parse().
+		source_path_ptr path;
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+		/// \brief	The path to the corresponding source document as a wide-string.
+		///
+		/// \availability This function is only available when #TOML_ENABLE_WINDOWS_COMPAT is enabled.
+		///
+		/// \remarks This will return an empty optional if no path was provided to toml::parse().
+		TOML_NODISCARD
+		optional<std::wstring> wide_path() const
+		{
+			if (!path || path->empty())
+				return {};
+			return { impl::widen(*path) };
+		}
+
+#endif
+
+		/// \brief	Prints a source_region to a stream.
+		///
+		/// \detail \cpp
+		/// auto tbl = toml::parse("bar = 42", "config.toml");
+		///
+		/// std::cout << "The value for 'bar' was found on "sv
+		///		<< tbl.get("bar")->source()
+		///		<< "\n";
+		/// \ecpp
+		///
+		/// \out
+		/// The value for 'bar' was found on line 1, column 7 of 'config.toml'
+		/// \eout
+		///
+		/// \param 	lhs	The stream.
+		/// \param 	rhs	The source_position.
+		///
+		/// \returns	The input stream.
+		friend std::ostream& operator<<(std::ostream& lhs, const source_region& rhs)
+		{
+			impl::print_to_stream(lhs, rhs);
+			return lhs;
+		}
+	};
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/std_except.hpp

@@ -0,0 +1,12 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+TOML_DISABLE_WARNINGS;
+#if TOML_EXCEPTIONS
+#include <stdexcept>
+#endif
+TOML_ENABLE_WARNINGS;

third_party/toml++/include/toml++/impl/std_initializer_list.hpp

@@ -0,0 +1,10 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+TOML_DISABLE_WARNINGS;
+#include <initializer_list>
+TOML_ENABLE_WARNINGS;

third_party/toml++/include/toml++/impl/std_map.hpp

@@ -0,0 +1,11 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+TOML_DISABLE_WARNINGS;
+#include <map>
+#include <iterator>
+TOML_ENABLE_WARNINGS;

third_party/toml++/include/toml++/impl/std_new.hpp

@@ -0,0 +1,18 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+TOML_DISABLE_WARNINGS;
+#include <new>
+TOML_ENABLE_WARNINGS;
+
+#if (!defined(__apple_build_version__) && TOML_CLANG >= 8) || TOML_GCC >= 7 || TOML_ICC >= 1910 || TOML_MSVC >= 1914
+#define TOML_LAUNDER(x) __builtin_launder(x)
+#elif defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606
+#define TOML_LAUNDER(x) std::launder(x)
+#else
+#define TOML_LAUNDER(x) x
+#endif

third_party/toml++/include/toml++/impl/std_optional.hpp

@@ -0,0 +1,32 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+TOML_DISABLE_WARNINGS;
+#if !TOML_HAS_CUSTOM_OPTIONAL_TYPE
+#include <optional>
+#endif
+TOML_ENABLE_WARNINGS;
+
+TOML_NAMESPACE_START
+{
+#if TOML_HAS_CUSTOM_OPTIONAL_TYPE
+
+	template <typename T>
+	using optional = TOML_OPTIONAL_TYPE<T>;
+
+#else
+
+	/// \brief	The 'optional' type used throughout the library.
+	///
+	/// \remarks By default this will be an alias for std::optional, but you can change the optional type
+	/// 		 used by the library by defining #TOML_OPTIONAL_TYPE.
+	template <typename T>
+	using optional = std::optional<T>;
+
+#endif
+}
+TOML_NAMESPACE_END;

third_party/toml++/include/toml++/impl/std_string.hpp

@@ -0,0 +1,53 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+TOML_DISABLE_WARNINGS;
+#include <string_view>
+#include <string>
+TOML_ENABLE_WARNINGS;
+
+#if TOML_DOXYGEN                                                                                                       \
+	|| (defined(__cpp_char8_t) && __cpp_char8_t >= 201811 && defined(__cpp_lib_char8_t)                                \
+		&& __cpp_lib_char8_t >= 201907)
+#define TOML_HAS_CHAR8 1
+#else
+#define TOML_HAS_CHAR8 0
+#endif
+
+/// \cond
+
+namespace toml // non-abi namespace; this is not an error
+{
+	using namespace std::string_literals;
+	using namespace std::string_view_literals;
+}
+
+#if TOML_ENABLE_WINDOWS_COMPAT
+
+TOML_IMPL_NAMESPACE_START
+{
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	std::string narrow(std::wstring_view);
+
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	std::wstring widen(std::string_view);
+
+#if TOML_HAS_CHAR8
+
+	TOML_NODISCARD
+	TOML_EXPORTED_FREE_FUNCTION
+	std::wstring widen(std::u8string_view);
+
+#endif
+}
+TOML_IMPL_NAMESPACE_END;
+
+#endif // TOML_ENABLE_WINDOWS_COMPAT
+
+/// \endcond

third_party/toml++/include/toml++/impl/std_string.inl

@@ -0,0 +1,99 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+//# {{
+#include "preprocessor.hpp"
+#if !TOML_IMPLEMENTATION
+#error This is an implementation-only header.
+#endif
+//# }}
+
+#if TOML_WINDOWS
+#include "std_string.hpp"
+#ifndef _WINDOWS_
+#if TOML_INCLUDE_WINDOWS_H
+#include <Windows.h>
+#else
+
+extern "C" __declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int CodePage,
+																   unsigned long dwFlags,
+																   const wchar_t* lpWideCharStr,
+																   int cchWideChar,
+																   char* lpMultiByteStr,
+																   int cbMultiByte,
+																   const char* lpDefaultChar,
+																   int* lpUsedDefaultChar);
+
+extern "C" __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int CodePage,
+																   unsigned long dwFlags,
+																   const char* lpMultiByteStr,
+																   int cbMultiByte,
+																   wchar_t* lpWideCharStr,
+																   int cchWideChar);
+
+#endif // TOML_INCLUDE_WINDOWS_H
+#endif // _WINDOWS_
+#include "header_start.hpp"
+
+TOML_IMPL_NAMESPACE_START
+{
+	TOML_EXTERNAL_LINKAGE
+	std::string narrow(std::wstring_view str)
+	{
+		if (str.empty())
+			return {};
+
+		std::string s;
+		const auto len =
+			::WideCharToMultiByte(65001, 0, str.data(), static_cast<int>(str.length()), nullptr, 0, nullptr, nullptr);
+		if (len)
+		{
+			s.resize(static_cast<size_t>(len));
+			::WideCharToMultiByte(65001,
+								  0,
+								  str.data(),
+								  static_cast<int>(str.length()),
+								  s.data(),
+								  len,
+								  nullptr,
+								  nullptr);
+		}
+		return s;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	std::wstring widen(std::string_view str)
+	{
+		if (str.empty())
+			return {};
+
+		std::wstring s;
+		const auto len = ::MultiByteToWideChar(65001, 0, str.data(), static_cast<int>(str.length()), nullptr, 0);
+		if (len)
+		{
+			s.resize(static_cast<size_t>(len));
+			::MultiByteToWideChar(65001, 0, str.data(), static_cast<int>(str.length()), s.data(), len);
+		}
+		return s;
+	}
+
+#if TOML_HAS_CHAR8
+
+	TOML_EXTERNAL_LINKAGE
+	std::wstring widen(std::u8string_view str)
+	{
+		if (str.empty())
+			return {};
+
+		return widen(std::string_view{ reinterpret_cast<const char*>(str.data()), str.length() });
+	}
+
+#endif // TOML_HAS_CHAR8
+}
+TOML_IMPL_NAMESPACE_END;
+
+#include "header_end.hpp"
+#endif // TOML_WINDOWS

third_party/toml++/include/toml++/impl/std_utility.hpp

@@ -0,0 +1,10 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+TOML_DISABLE_WARNINGS;
+#include <utility>
+TOML_ENABLE_WARNINGS;

third_party/toml++/include/toml++/impl/std_variant.hpp

@@ -0,0 +1,10 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+TOML_DISABLE_WARNINGS;
+#include <variant>
+TOML_ENABLE_WARNINGS;

third_party/toml++/include/toml++/impl/std_vector.hpp

@@ -0,0 +1,11 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+TOML_DISABLE_WARNINGS;
+#include <vector>
+#include <iterator>
+TOML_ENABLE_WARNINGS;

third_party/toml++/include/toml++/impl/table.inl

@@ -0,0 +1,318 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+//# {{
+#include "preprocessor.hpp"
+#if !TOML_IMPLEMENTATION
+#error This is an implementation-only header.
+#endif
+//# }}
+
+#include "table.hpp"
+#include "node_view.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	TOML_EXTERNAL_LINKAGE
+	table::table() noexcept
+	{
+#if TOML_LIFETIME_HOOKS
+		TOML_TABLE_CREATED;
+#endif
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	table::~table() noexcept
+	{
+#if TOML_LIFETIME_HOOKS
+		TOML_TABLE_DESTROYED;
+#endif
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	table::table(const impl::table_init_pair* b, const impl::table_init_pair* e)
+	{
+#if TOML_LIFETIME_HOOKS
+		TOML_TABLE_CREATED;
+#endif
+
+		TOML_ASSERT_ASSUME(b);
+		TOML_ASSERT_ASSUME(e);
+		TOML_ASSERT_ASSUME(b <= e);
+
+		if TOML_UNLIKELY(b == e)
+			return;
+
+		for (; b != e; b++)
+		{
+			if (!b->value) // empty node_views
+				continue;
+
+			map_.insert_or_assign(std::move(b->key), std::move(b->value));
+		}
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	table::table(const table& other) //
+		: node(other),
+		  inline_{ other.inline_ }
+	{
+		for (auto&& [k, v] : other.map_)
+			map_.emplace_hint(map_.end(), k, impl::make_node(*v));
+
+#if TOML_LIFETIME_HOOKS
+		TOML_TABLE_CREATED;
+#endif
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	table::table(table && other) noexcept //
+		: node(std::move(other)),
+		  map_{ std::move(other.map_) },
+		  inline_{ other.inline_ }
+	{
+#if TOML_LIFETIME_HOOKS
+		TOML_TABLE_CREATED;
+#endif
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	table& table::operator=(const table& rhs)
+	{
+		if (&rhs != this)
+		{
+			node::operator=(rhs);
+			map_.clear();
+			for (auto&& [k, v] : rhs.map_)
+				map_.emplace_hint(map_.end(), k, impl::make_node(*v));
+			inline_ = rhs.inline_;
+		}
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	table& table::operator=(table&& rhs) noexcept
+	{
+		if (&rhs != this)
+		{
+			node::operator=(std::move(rhs));
+			map_	= std::move(rhs.map_);
+			inline_ = rhs.inline_;
+		}
+		return *this;
+	}
+
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	bool table::is_homogeneous(node_type ntype) const noexcept
+	{
+		if (map_.empty())
+			return false;
+
+		if (ntype == node_type::none)
+			ntype = map_.cbegin()->second->type();
+
+		for (auto&& [k, v] : map_)
+		{
+			TOML_UNUSED(k);
+			if (v->type() != ntype)
+				return false;
+		}
+
+		return true;
+	}
+
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	bool table::is_homogeneous(node_type ntype, node * &first_nonmatch) noexcept
+	{
+		if (map_.empty())
+		{
+			first_nonmatch = {};
+			return false;
+		}
+		if (ntype == node_type::none)
+			ntype = map_.cbegin()->second->type();
+		for (const auto& [k, v] : map_)
+		{
+			TOML_UNUSED(k);
+			if (v->type() != ntype)
+			{
+				first_nonmatch = v.get();
+				return false;
+			}
+		}
+		return true;
+	}
+
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	bool table::is_homogeneous(node_type ntype, const node*& first_nonmatch) const noexcept
+	{
+		node* fnm		  = nullptr;
+		const auto result = const_cast<table&>(*this).is_homogeneous(ntype, fnm);
+		first_nonmatch	  = fnm;
+		return result;
+	}
+
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	node* table::get(std::string_view key) noexcept
+	{
+		if (auto it = map_.find(key); it != map_.end())
+			return it->second.get();
+		return nullptr;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	node& table::at(std::string_view key)
+	{
+		auto n = get(key);
+
+#if TOML_COMPILER_HAS_EXCEPTIONS
+
+		if (!n)
+		{
+			auto err = "key '"s;
+			err.append(key);
+			err.append("' not found in table"sv);
+			throw std::out_of_range{ err };
+		}
+
+#else
+
+		TOML_ASSERT_ASSUME(n && "key not found in table!");
+
+#endif
+
+		return *n;
+	}
+
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	table::map_iterator table::get_lower_bound(std::string_view key) noexcept
+	{
+		return map_.lower_bound(key);
+	}
+
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	table::iterator table::find(std::string_view key) noexcept
+	{
+		return iterator{ map_.find(key) };
+	}
+
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	table::const_iterator table::find(std::string_view key) const noexcept
+	{
+		return const_iterator{ map_.find(key) };
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	table::map_iterator table::erase(const_map_iterator pos) noexcept
+	{
+		return map_.erase(pos);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	table::map_iterator table::erase(const_map_iterator begin, const_map_iterator end) noexcept
+	{
+		return map_.erase(begin, end);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	size_t table::erase(std::string_view key) noexcept
+	{
+		if (auto it = map_.find(key); it != map_.end())
+		{
+			map_.erase(it);
+			return size_t{ 1 };
+		}
+		return size_t{};
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	table& table::prune(bool recursive)& noexcept
+	{
+		if (map_.empty())
+			return *this;
+
+		for (auto it = map_.begin(); it != map_.end();)
+		{
+			if (auto arr = it->second->as_array())
+			{
+				if (recursive)
+					arr->prune(true);
+
+				if (arr->empty())
+				{
+					it = map_.erase(it);
+					continue;
+				}
+			}
+			else if (auto tbl = it->second->as_table())
+			{
+				if (recursive)
+					tbl->prune(true);
+
+				if (tbl->empty())
+				{
+					it = map_.erase(it);
+					continue;
+				}
+			}
+			it++;
+		}
+
+		return *this;
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void table::clear() noexcept
+	{
+		map_.clear();
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	table::map_iterator table::insert_with_hint(const_iterator hint, key && k, impl::node_ptr && v)
+	{
+		return map_.emplace_hint(const_map_iterator{ hint }, std::move(k), std::move(v));
+	}
+
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	bool TOML_CALLCONV table::equal(const table& lhs, const table& rhs) noexcept
+	{
+		if (&lhs == &rhs)
+			return true;
+		if (lhs.map_.size() != rhs.map_.size())
+			return false;
+
+		for (auto l = lhs.map_.begin(), r = rhs.map_.begin(), e = lhs.map_.end(); l != e; l++, r++)
+		{
+			if (l->first != r->first)
+				return false;
+
+			const auto lhs_type = l->second->type();
+			const node& rhs_	= *r->second;
+			const auto rhs_type = rhs_.type();
+			if (lhs_type != rhs_type)
+				return false;
+
+			const bool equal = l->second->visit(
+				[&](const auto& lhs_) noexcept
+				{ return lhs_ == *reinterpret_cast<std::remove_reference_t<decltype(lhs_)>*>(&rhs_); });
+			if (!equal)
+				return false;
+		}
+		return true;
+	}
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/toml_formatter.hpp

@@ -0,0 +1,153 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+#if TOML_ENABLE_FORMATTERS
+
+#include "std_vector.hpp"
+#include "formatter.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	/// \brief	A wrapper for printing TOML objects out to a stream as formatted TOML.
+	///
+	/// \availability This class is only available when #TOML_ENABLE_FORMATTERS is enabled.
+	///
+	/// \remarks You generally don't need to create an instance of this class explicitly; the stream
+	/// 		 operators of the TOML node types already print themselves out using this formatter.
+	///
+	/// \detail \cpp
+	/// auto tbl = toml::table{
+	///		{ "description", "This is some TOML, yo." },
+	///		{ "fruit", toml::array{ "apple", "orange", "pear" } },
+	///		{ "numbers", toml::array{ 1, 2, 3, 4, 5 } },
+	///		{ "table", toml::table{ { "foo", "bar" } } }
+	/// };
+	///
+	/// // these two lines are equivalent:
+	///	std::cout << toml::toml_formatter{ tbl } << "\n";
+	///	std::cout << tbl << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// description = "This is some TOML, yo."
+	/// fruit = ["apple", "orange", "pear"]
+	/// numbers = [1, 2, 3, 4, 5]
+	///
+	/// [table]
+	/// foo = "bar"
+	/// \eout
+	class TOML_EXPORTED_CLASS toml_formatter : impl::formatter
+	{
+	  private:
+		/// \cond
+
+		using base = impl::formatter;
+		std::vector<const key*> key_path_;
+		bool pending_table_separator_ = false;
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print_pending_table_separator();
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const key&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print_inline(const toml::table&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const toml::array&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const toml::table&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print();
+
+		static constexpr impl::formatter_constants constants = { format_flags::none, // mandatory
+																 format_flags::none, // ignored
+																 "inf"sv,
+																 "-inf"sv,
+																 "nan"sv,
+																 "true"sv,
+																 "false"sv };
+
+		/// \endcond
+
+	  public:
+		/// \brief	The default flags for a toml_formatter.
+		static constexpr format_flags default_flags = constants.mandatory_flags				   //
+													| format_flags::allow_literal_strings	   //
+													| format_flags::allow_multi_line_strings   //
+													| format_flags::allow_unicode_strings	   //
+													| format_flags::allow_real_tabs_in_strings //
+													| format_flags::allow_binary_integers	   //
+													| format_flags::allow_octal_integers	   //
+													| format_flags::allow_hexadecimal_integers //
+													| format_flags::indentation;
+
+		/// \brief	Constructs a TOML formatter and binds it to a TOML object.
+		///
+		/// \param 	source	The source TOML object.
+		/// \param 	flags 	Format option flags.
+		TOML_NODISCARD_CTOR
+		explicit toml_formatter(const toml::node& source, format_flags flags = default_flags) noexcept
+			: base{ &source, nullptr, constants, { flags, "    "sv } }
+		{}
+
+#if TOML_DOXYGEN || (TOML_ENABLE_PARSER && !TOML_EXCEPTIONS)
+
+		/// \brief	Constructs a TOML formatter and binds it to a toml::parse_result.
+		///
+		/// \availability This constructor is only available when exceptions are disabled.
+		///
+		/// \attention Formatting a failed parse result will simply dump the error message out as-is.
+		///		This will not be valid TOML, but at least gives you something to log or show up in diagnostics:
+		/// \cpp
+		/// std::cout << toml::toml_formatter{ toml::parse("a = 'b'"sv) } // ok
+		///           << "\n\n"
+		///           << toml::toml_formatter{ toml::parse("a = "sv) } // malformed
+		///           << "\n";
+		/// \ecpp
+		/// \out
+		/// a = 'b'
+		///
+		/// Error while parsing key-value pair: encountered end-of-file
+		///         (error occurred at line 1, column 5)
+		/// \eout
+		/// Use the library with exceptions if you want to avoid this scenario.
+		///
+		/// \param 	result	The parse result.
+		/// \param 	flags 	Format option flags.
+		TOML_NODISCARD_CTOR
+		explicit toml_formatter(const toml::parse_result& result, format_flags flags = default_flags) noexcept
+			: base{ nullptr, &result, constants, { flags, "    "sv } }
+		{}
+
+#endif
+
+		/// \brief	Prints the bound TOML object out to the stream as formatted TOML.
+		friend std::ostream& operator<<(std::ostream& lhs, toml_formatter& rhs)
+		{
+			rhs.attach(lhs);
+			rhs.key_path_.clear();
+			rhs.print();
+			rhs.detach();
+			return lhs;
+		}
+
+		/// \brief	Prints the bound TOML object out to the stream as formatted TOML (rvalue overload).
+		friend std::ostream& operator<<(std::ostream& lhs, toml_formatter&& rhs)
+		{
+			return lhs << rhs; // as lvalue
+		}
+	};
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"
+#endif // TOML_ENABLE_FORMATTERS

third_party/toml++/include/toml++/impl/toml_formatter.inl

@@ -0,0 +1,405 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+//# {{
+#if !TOML_IMPLEMENTATION
+#error This is an implementation-only header.
+#endif
+//# }}
+#if TOML_ENABLE_FORMATTERS
+
+#include "toml_formatter.hpp"
+#include "print_to_stream.hpp"
+#include "value.hpp"
+#include "table.hpp"
+#include "array.hpp"
+#include "unicode.hpp"
+#include "header_start.hpp"
+TOML_DISABLE_ARITHMETIC_WARNINGS;
+
+TOML_ANON_NAMESPACE_START
+{
+	TOML_INTERNAL_LINKAGE
+	size_t toml_formatter_count_inline_columns(const node& node, size_t line_wrap_cols) noexcept
+	{
+		switch (node.type())
+		{
+			case node_type::table:
+			{
+				auto& tbl = *reinterpret_cast<const table*>(&node);
+				if (tbl.empty())
+					return 2u;		// "{}"
+				size_t weight = 3u; // "{ }"
+				for (auto&& [k, v] : tbl)
+				{
+					weight += k.length() + toml_formatter_count_inline_columns(v, line_wrap_cols) + 2u; // +  ", "
+					if (weight >= line_wrap_cols)
+						break;
+				}
+				return weight;
+			}
+
+			case node_type::array:
+			{
+				auto& arr = *reinterpret_cast<const array*>(&node);
+				if (arr.empty())
+					return 2u;		// "[]"
+				size_t weight = 3u; // "[ ]"
+				for (auto& elem : arr)
+				{
+					weight += toml_formatter_count_inline_columns(elem, line_wrap_cols) + 2u; // +  ", "
+					if (weight >= line_wrap_cols)
+						break;
+				}
+				return weight;
+			}
+
+			case node_type::string:
+			{
+				// todo: proper utf8 decoding?
+				// todo: tab awareness?
+				auto& str = (*reinterpret_cast<const value<std::string>*>(&node)).get();
+				return str.length() + 2u; // + ""
+			}
+
+			case node_type::integer:
+			{
+				auto val = (*reinterpret_cast<const value<int64_t>*>(&node)).get();
+				if (!val)
+					return 1u;
+				size_t weight = {};
+				if (val < 0)
+				{
+					weight += 1u;
+					val *= -1;
+				}
+				return weight + static_cast<size_t>(log10(static_cast<double>(val))) + 1u;
+			}
+
+			case node_type::floating_point:
+			{
+				auto val = (*reinterpret_cast<const value<double>*>(&node)).get();
+				if (val == 0.0)
+					return 3u;		// "0.0"
+				size_t weight = 2u; // ".0"
+				if (val < 0.0)
+				{
+					weight += 1u;
+					val *= -1.0;
+				}
+				return weight + static_cast<size_t>(log10(val)) + 1u;
+				break;
+			}
+
+			case node_type::boolean: return 5u;
+			case node_type::date: [[fallthrough]];
+			case node_type::time: return 10u;
+			case node_type::date_time: return 30u;
+			case node_type::none: TOML_UNREACHABLE;
+			default: TOML_UNREACHABLE;
+		}
+
+		TOML_UNREACHABLE;
+	}
+
+	TOML_INTERNAL_LINKAGE
+	bool toml_formatter_forces_multiline(const node& node, size_t line_wrap_cols, size_t starting_column_bias) noexcept
+	{
+		return (toml_formatter_count_inline_columns(node, line_wrap_cols) + starting_column_bias) >= line_wrap_cols;
+	}
+}
+TOML_ANON_NAMESPACE_END;
+
+TOML_NAMESPACE_START
+{
+	TOML_EXTERNAL_LINKAGE
+	void toml_formatter::print_pending_table_separator()
+	{
+		if (pending_table_separator_)
+		{
+			print_newline(true);
+			print_newline(true);
+			pending_table_separator_ = false;
+		}
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void toml_formatter::print(const key& k)
+	{
+		print_string(k.str(), false, true, false);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void toml_formatter::print_inline(const table& tbl)
+	{
+		if (tbl.empty())
+		{
+			print_unformatted("{}"sv);
+			return;
+		}
+
+		print_unformatted("{ "sv);
+
+		bool first = false;
+		for (auto&& [k, v] : tbl)
+		{
+			if (first)
+				print_unformatted(", "sv);
+			first = true;
+
+			print(k);
+			if (terse_kvps())
+				print_unformatted("="sv);
+			else
+				print_unformatted(" = "sv);
+
+			const auto type = v.type();
+			TOML_ASSUME(type != node_type::none);
+			switch (type)
+			{
+				case node_type::table: print_inline(*reinterpret_cast<const table*>(&v)); break;
+				case node_type::array: print(*reinterpret_cast<const array*>(&v)); break;
+				default: print_value(v, type);
+			}
+		}
+
+		print_unformatted(" }"sv);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void toml_formatter::print(const array& arr)
+	{
+		if (arr.empty())
+		{
+			print_unformatted("[]"sv);
+			return;
+		}
+
+		const auto original_indent = indent();
+		const auto multiline	   = TOML_ANON_NAMESPACE::toml_formatter_forces_multiline(
+			  arr,
+			  120u,
+			  indent_columns() * static_cast<size_t>(original_indent < 0 ? 0 : original_indent));
+
+		print_unformatted("["sv);
+
+		if (multiline)
+		{
+			if (original_indent < 0)
+				indent(0);
+			if (indent_array_elements())
+				increase_indent();
+		}
+		else
+			print_unformatted(' ');
+
+		for (size_t i = 0; i < arr.size(); i++)
+		{
+			if (i > 0u)
+			{
+				print_unformatted(',');
+				if (!multiline)
+					print_unformatted(' ');
+			}
+
+			if (multiline)
+			{
+				print_newline(true);
+				print_indent();
+			}
+
+			auto& v			= arr[i];
+			const auto type = v.type();
+			TOML_ASSUME(type != node_type::none);
+			switch (type)
+			{
+				case node_type::table: print_inline(*reinterpret_cast<const table*>(&v)); break;
+				case node_type::array: print(*reinterpret_cast<const array*>(&v)); break;
+				default: print_value(v, type);
+			}
+		}
+		if (multiline)
+		{
+			indent(original_indent);
+			print_newline(true);
+			print_indent();
+		}
+		else
+			print_unformatted(' ');
+
+		print_unformatted("]"sv);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void toml_formatter::print(const table& tbl)
+	{
+		static constexpr auto is_non_inline_array_of_tables = [](const node& n) noexcept
+		{
+			const auto arr = n.as_array();
+			if (!arr || !arr->is_array_of_tables())
+				return false;
+
+			return !reinterpret_cast<const table*>(&(*arr)[0])->is_inline();
+		};
+
+		// values, arrays, and inline tables/table arrays
+		for (auto&& [k, v] : tbl)
+		{
+			const auto type = v.type();
+			if ((type == node_type::table && !reinterpret_cast<const table*>(&v)->is_inline())
+				|| (type == node_type::array && is_non_inline_array_of_tables(v)))
+				continue;
+
+			pending_table_separator_ = true;
+			print_newline();
+			print_indent();
+			print(k);
+			if (terse_kvps())
+				print_unformatted("="sv);
+			else
+				print_unformatted(" = "sv);
+			TOML_ASSUME(type != node_type::none);
+			switch (type)
+			{
+				case node_type::table: print_inline(*reinterpret_cast<const table*>(&v)); break;
+				case node_type::array: print(*reinterpret_cast<const array*>(&v)); break;
+				default: print_value(v, type);
+			}
+		}
+
+		const auto print_key_path = [&]()
+		{
+			size_t i{};
+			for (const auto k : key_path_)
+			{
+				if (i++)
+					print_unformatted('.');
+				print(*k);
+			}
+		};
+
+		// non-inline tables
+		for (auto&& [k, v] : tbl)
+		{
+			const auto type = v.type();
+			if (type != node_type::table || reinterpret_cast<const table*>(&v)->is_inline())
+				continue;
+			auto& child_tbl = *reinterpret_cast<const table*>(&v);
+
+			// we can skip indenting and emitting the headers for tables that only contain other tables
+			// (so we don't over-nest)
+			size_t child_value_count{}; // includes inline tables and non-table arrays
+			size_t child_table_count{};
+			size_t child_table_array_count{};
+			for (auto&& [child_k, child_v] : child_tbl)
+			{
+				TOML_UNUSED(child_k);
+				const auto child_type = child_v.type();
+				TOML_ASSUME(child_type != node_type::none);
+				switch (child_type)
+				{
+					case node_type::table:
+						if (reinterpret_cast<const table*>(&child_v)->is_inline())
+							child_value_count++;
+						else
+							child_table_count++;
+						break;
+
+					case node_type::array:
+						if (is_non_inline_array_of_tables(child_v))
+							child_table_array_count++;
+						else
+							child_value_count++;
+						break;
+
+					default: child_value_count++;
+				}
+			}
+			bool skip_self = false;
+			if (child_value_count == 0u && (child_table_count > 0u || child_table_array_count > 0u))
+				skip_self = true;
+
+			key_path_.push_back(&k);
+
+			if (!skip_self)
+			{
+				print_pending_table_separator();
+				if (indent_sub_tables())
+					increase_indent();
+				print_indent();
+				print_unformatted("["sv);
+				print_key_path();
+				print_unformatted("]"sv);
+				pending_table_separator_ = true;
+			}
+
+			print(child_tbl);
+
+			key_path_.pop_back();
+			if (!skip_self && indent_sub_tables())
+				decrease_indent();
+		}
+
+		// table arrays
+		for (auto&& [k, v] : tbl)
+		{
+			if (!is_non_inline_array_of_tables(v))
+				continue;
+			auto& arr = *reinterpret_cast<const array*>(&v);
+
+			if (indent_sub_tables())
+				increase_indent();
+			key_path_.push_back(&k);
+
+			for (size_t i = 0; i < arr.size(); i++)
+			{
+				print_pending_table_separator();
+				print_indent();
+				print_unformatted("[["sv);
+				print_key_path();
+				print_unformatted("]]"sv);
+				pending_table_separator_ = true;
+				print(*reinterpret_cast<const table*>(&arr[i]));
+			}
+
+			key_path_.pop_back();
+			if (indent_sub_tables())
+				decrease_indent();
+		}
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void toml_formatter::print()
+	{
+		if (dump_failed_parse_result())
+			return;
+
+		switch (auto source_type = source().type())
+		{
+			case node_type::table:
+			{
+				auto& tbl = *reinterpret_cast<const table*>(&source());
+				if (tbl.is_inline())
+					print_inline(tbl);
+				else
+				{
+					decrease_indent(); // so root kvps and tables have the same indent
+					print(tbl);
+				}
+				break;
+			}
+
+			case node_type::array: print(*reinterpret_cast<const array*>(&source())); break;
+
+			default: print_value(source(), source_type);
+		}
+	}
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"
+#endif // TOML_ENABLE_FORMATTERS

third_party/toml++/include/toml++/impl/unicode.hpp

@@ -0,0 +1,197 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "unicode_autogenerated.hpp"
+#include "header_start.hpp"
+/// \cond
+
+TOML_IMPL_NAMESPACE_START
+{
+	TOML_CONST_GETTER
+	constexpr bool is_string_delimiter(char32_t c) noexcept
+	{
+		return c == U'"' || c == U'\'';
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_ascii_letter(char32_t c) noexcept
+	{
+		return (c >= U'a' && c <= U'z') || (c >= U'A' && c <= U'Z');
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_binary_digit(char32_t c) noexcept
+	{
+		return c == U'0' || c == U'1';
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_octal_digit(char32_t c) noexcept
+	{
+		return (c >= U'0' && c <= U'7');
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_decimal_digit(char32_t c) noexcept
+	{
+		return (c >= U'0' && c <= U'9');
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_hexadecimal_digit(char32_t c) noexcept
+	{
+		return U'0' <= c && c <= U'f' && (1ull << (static_cast<uint_least64_t>(c) - 0x30u)) & 0x7E0000007E03FFull;
+	}
+
+	template <typename T>
+	TOML_CONST_GETTER
+	constexpr uint_least32_t hex_to_dec(const T c) noexcept
+	{
+		if constexpr (std::is_same_v<remove_cvref<T>, uint_least32_t>)
+			return c >= 0x41u					 // >= 'A'
+					 ? 10u + (c | 0x20u) - 0x61u // - 'a'
+					 : c - 0x30u				 // - '0'
+				;
+		else
+			return hex_to_dec(static_cast<uint_least32_t>(c));
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_horizontal_whitespace(char32_t c) noexcept
+	{
+		return is_ascii_horizontal_whitespace(c) || is_non_ascii_horizontal_whitespace(c);
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_vertical_whitespace(char32_t c) noexcept
+	{
+		return is_ascii_vertical_whitespace(c) || is_non_ascii_vertical_whitespace(c);
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_whitespace(char32_t c) noexcept
+	{
+		return is_horizontal_whitespace(c) || is_vertical_whitespace(c);
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_bare_key_character(char32_t c) noexcept
+	{
+		return is_ascii_bare_key_character(c)
+#if TOML_LANG_UNRELEASED // toml/pull/891 (unicode bare keys)
+			|| is_non_ascii_bare_key_character(c)
+#endif
+			;
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_value_terminator(char32_t c) noexcept
+	{
+		return is_whitespace(c) || c == U']' || c == U'}' || c == U',' || c == U'#';
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_control_character(char c) noexcept
+	{
+		return c <= '\u001F' || c == '\u007F';
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_control_character(char32_t c) noexcept
+	{
+		return c <= U'\u001F' || c == U'\u007F';
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_nontab_control_character(char32_t c) noexcept
+	{
+		return c <= U'\u0008' || (c >= U'\u000A' && c <= U'\u001F') || c == U'\u007F';
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_unicode_surrogate(char32_t c) noexcept
+	{
+		return c >= 0xD800u && c <= 0xDFFF;
+	}
+
+	struct utf8_decoder
+	{
+		// utf8_decoder based on this: https://bjoern.hoehrmann.de/utf-8/decoder/dfa/
+		// Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
+
+		uint_least32_t state{};
+		char32_t codepoint{};
+
+		static constexpr uint8_t state_table[]{
+			0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,
+			0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,
+			0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,
+			0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,
+			0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	1,	1,	1,	1,	1,	1,	1,
+			1,	1,	1,	1,	1,	1,	1,	1,	1,	9,	9,	9,	9,	9,	9,	9,	9,	9,	9,	9,	9,	9,	9,	9,	9,	7,	7,
+			7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,	7,
+			7,	7,	7,	8,	8,	2,	2,	2,	2,	2,	2,	2,	2,	2,	2,	2,	2,	2,	2,	2,	2,	2,	2,	2,	2,	2,	2,
+			2,	2,	2,	2,	2,	2,	2,	2,	10, 3,	3,	3,	3,	3,	3,	3,	3,	3,	3,	3,	3,	4,	3,	3,	11, 6,	6,
+			6,	5,	8,	8,	8,	8,	8,	8,	8,	8,	8,	8,	8,
+
+			0,	12, 24, 36, 60, 96, 84, 12, 12, 12, 48, 72, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 0,	12,
+			12, 12, 12, 12, 0,	12, 0,	12, 12, 12, 24, 12, 12, 12, 12, 12, 24, 12, 24, 12, 12, 12, 12, 12, 12, 12, 12,
+			12, 24, 12, 12, 12, 12, 12, 24, 12, 12, 12, 12, 12, 12, 12, 24, 12, 12, 12, 12, 12, 12, 12, 12, 12, 36, 12,
+			36, 12, 12, 12, 36, 12, 12, 12, 12, 12, 36, 12, 36, 12, 12, 12, 36, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12
+		};
+
+		TOML_PURE_INLINE_GETTER
+		constexpr bool error() const noexcept
+		{
+			return state == uint_least32_t{ 12u };
+		}
+
+		TOML_PURE_INLINE_GETTER
+		constexpr bool has_code_point() const noexcept
+		{
+			return state == uint_least32_t{};
+		}
+
+		TOML_PURE_INLINE_GETTER
+		constexpr bool needs_more_input() const noexcept
+		{
+			return !has_code_point() && !error();
+		}
+
+		constexpr void operator()(uint8_t byte) noexcept
+		{
+			TOML_ASSERT_ASSUME(!error());
+
+			const auto type = state_table[byte];
+
+			codepoint = static_cast<char32_t>(has_code_point() ? (uint_least32_t{ 255u } >> type) & byte
+															   : (byte & uint_least32_t{ 63u })
+																	 | (static_cast<uint_least32_t>(codepoint) << 6));
+
+			state = state_table[state + uint_least32_t{ 256u } + type];
+		}
+
+		TOML_ALWAYS_INLINE
+		constexpr void operator()(char c) noexcept
+		{
+			operator()(static_cast<uint8_t>(c));
+		}
+
+		TOML_ALWAYS_INLINE
+		constexpr void reset() noexcept
+		{
+			state = {};
+		}
+	};
+
+	TOML_PURE_GETTER
+	TOML_ATTR(nonnull)
+	bool is_ascii(const char* str, size_t len) noexcept;
+}
+TOML_IMPL_NAMESPACE_END;
+
+/// \endcond
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/unicode.inl

@@ -0,0 +1,60 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+//# {{
+#include "preprocessor.hpp"
+#if !TOML_IMPLEMENTATION
+#error This is an implementation-only header.
+#endif
+//# }}
+
+#include "unicode.hpp"
+#include "simd.hpp"
+#include "header_start.hpp"
+
+TOML_IMPL_NAMESPACE_START
+{
+	TOML_PURE_GETTER
+	TOML_EXTERNAL_LINKAGE
+	bool is_ascii(const char* str, size_t len) noexcept
+	{
+		const char* const end = str + len;
+
+#if TOML_HAS_SSE2 && (128 % CHAR_BIT) == 0
+		{
+			constexpr size_t chars_per_vector = 128u / CHAR_BIT;
+
+			if (const size_t simdable = len - (len % chars_per_vector))
+			{
+				__m128i mask = _mm_setzero_si128();
+				for (const char* const e = str + simdable; str < e; str += chars_per_vector)
+				{
+					const __m128i current_bytes = _mm_loadu_si128(reinterpret_cast<const __m128i*>(str));
+					mask						= _mm_or_si128(mask, current_bytes);
+				}
+				const __m128i has_error = _mm_cmpgt_epi8(_mm_setzero_si128(), mask);
+
+#if TOML_HAS_SSE4_1
+				if (!_mm_testz_si128(has_error, has_error))
+					return false;
+#else
+				if (_mm_movemask_epi8(_mm_cmpeq_epi8(has_error, _mm_setzero_si128())) != 0xFFFF)
+					return false;
+#endif
+			}
+		}
+#endif
+
+		for (; str < end; str++)
+			if (static_cast<unsigned char>(*str) > 127u)
+				return false;
+
+		return true;
+	}
+}
+TOML_IMPL_NAMESPACE_END;
+
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/unicode_autogenerated.hpp

@@ -0,0 +1,182 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+#include "header_start.hpp"
+/// \cond
+
+#if TOML_GCC && TOML_GCC < 9
+#pragma GCC push_options
+#pragma GCC optimize("O1") // codegen bugs
+#endif
+
+// the functions in this namespace block are automatically generated by a tool - they are not meant to be hand-edited
+
+TOML_IMPL_NAMESPACE_START
+{
+	TOML_CONST_GETTER
+	constexpr bool is_ascii_horizontal_whitespace(char32_t c) noexcept
+	{
+		return c == U'\t' || c == U' ';
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_non_ascii_horizontal_whitespace(char32_t c) noexcept
+	{
+		// 20 code units from 8 ranges (spanning a search area of 65120)
+
+		if (c < U'\xA0' || c > U'\uFEFF')
+			return false;
+
+		const auto child_index_0 = (static_cast<uint_least64_t>(c) - 0xA0ull) / 0x3FAull;
+		if ((1ull << child_index_0) & 0x7FFFFFFFFFFFF75Eull)
+			return false;
+		if (c == U'\xA0' || c == U'\u3000' || c == U'\uFEFF')
+			return true;
+		switch (child_index_0)
+		{
+			case 0x05: return c == U'\u1680' || c == U'\u180E';
+			case 0x07:
+				return (U'\u2000' <= c && c <= U'\u200B') || (U'\u205F' <= c && c <= U'\u2060') || c == U'\u202F';
+			default: TOML_UNREACHABLE;
+		}
+
+		TOML_UNREACHABLE;
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_ascii_vertical_whitespace(char32_t c) noexcept
+	{
+		return c >= U'\n' && c <= U'\r';
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_non_ascii_vertical_whitespace(char32_t c) noexcept
+	{
+		return (U'\u2028' <= c && c <= U'\u2029') || c == U'\x85';
+	}
+
+	TOML_CONST_GETTER
+	constexpr bool is_ascii_bare_key_character(char32_t c) noexcept
+	{
+#if TOML_LANG_UNRELEASED // toml/issues/644 ('+' in bare keys)
+		if TOML_UNLIKELY(c == U'+')
+			return true;
+#endif
+		// 64 code units from 5 ranges (spanning a search area of 78)
+
+		if (c < U'-' || c > U'z')
+			return false;
+
+		return (((static_cast<uint_least64_t>(c) - 0x2Dull) / 0x40ull) != 0ull)
+			|| ((1ull << (static_cast<uint_least64_t>(c) - 0x2Dull)) & 0xFFF43FFFFFF01FF9ull);
+	}
+
+#if TOML_LANG_UNRELEASED // toml/pull/891 (unicode bare keys)
+
+	TOML_CONST_GETTER
+	constexpr bool is_non_ascii_bare_key_character(char32_t c) noexcept
+	{
+		// 971732 code units from 16 ranges (spanning a search area of 982862)
+
+		if (c < U'\xB2' || c > U'\U000EFFFF')
+			return false;
+
+		const auto child_index_0 = (static_cast<uint_least64_t>(c) - 0xB2ull) / 0x3BFEull;
+		if ((1ull << child_index_0) & 0xFFFFFFFFFFFFFFE6ull)
+			return true;
+		switch (child_index_0)
+		{
+			case 0x00: // [0] 00B2 - 3CAF
+			{
+				// 12710 code units from 13 ranges (spanning a search area of 15358)
+
+				TOML_ASSUME(c >= U'\xB2' && c <= U'\u3CAF');
+
+				constexpr uint_least64_t bitmask_table_1[] = {
+					0xFFFFFFDFFFFFDC83u, 0xFFFFFFFFFFFFFFDFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFEFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0x000000000C003FFFu, 0xC000000000006000u, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0x000000003FFFFFFFu,
+					0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u,
+					0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u,
+					0x0000000000000000u, 0x0000000000000000u, 0xFFFFC00000000000u, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0x0000000000003FFFu, 0x0000000000000000u, 0x0000000000000000u,
+					0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u,
+					0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u,
+					0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u,
+					0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u,
+					0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u,
+					0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u, 0x0000000000000000u,
+					0x0000000000000000u, 0xFFFFFFFFFFFFC000u, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0x3FFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFF8000u, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu,
+					0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0xFFFFFFFFFFFFFFFFu, 0x3FFFFFFFFFFFFFFFu,
+				};
+				return bitmask_table_1[(static_cast<uint_least64_t>(c) - 0xB2ull) / 0x40ull]
+					 & (0x1ull << ((static_cast<uint_least64_t>(c) - 0xB2ull) % 0x40ull));
+			}
+			case 0x03: return c <= U'\uD7FF';
+			case 0x04:
+				return (U'\uF900' <= c && c <= U'\uFDCF') || (U'\uFDF0' <= c && c <= U'\uFFFD') || U'\U00010000' <= c;
+			default: TOML_UNREACHABLE;
+		}
+
+		TOML_UNREACHABLE;
+	}
+
+#endif // TOML_LANG_UNRELEASED
+}
+TOML_IMPL_NAMESPACE_END;
+
+#if TOML_GCC && TOML_GCC < 9
+#pragma GCC pop_options
+#endif
+
+/// \endcond
+#include "header_end.hpp"

third_party/toml++/include/toml++/impl/version.hpp

@@ -0,0 +1,13 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#define TOML_LIB_MAJOR 3
+#define TOML_LIB_MINOR 4
+#define TOML_LIB_PATCH 0
+
+#define TOML_LANG_MAJOR 1
+#define TOML_LANG_MINOR 0
+#define TOML_LANG_PATCH 0

third_party/toml++/include/toml++/impl/yaml_formatter.hpp

@@ -0,0 +1,139 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+#if TOML_ENABLE_FORMATTERS
+
+#include "formatter.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	/// \brief	A wrapper for printing TOML objects out to a stream as formatted YAML.
+	///
+	/// \availability This class is only available when #TOML_ENABLE_FORMATTERS is enabled.
+	///
+	/// \detail \cpp
+	/// auto some_toml = toml::parse(R"(
+	///		[fruit]
+	///		apple.color = "red"
+	///		apple.taste.sweet = true
+	///
+	///		[fruit.apple.texture]
+	///		smooth = true
+	/// )"sv);
+	///	std::cout << toml::yaml_formatter{ some_toml } << "\n";
+	/// \ecpp
+	///
+	/// \out
+	/// fruit:
+	///   apple:
+	///     color: red
+	///     taste:
+	///       sweet: true
+	///     texture:
+	///       smooth: true
+	/// \eout
+	class TOML_EXPORTED_CLASS yaml_formatter : impl::formatter
+	{
+	  private:
+		/// \cond
+
+		using base = impl::formatter;
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print_yaml_string(const value<std::string>&);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const toml::table&, bool = false);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print(const toml::array&, bool = false);
+
+		TOML_EXPORTED_MEMBER_FUNCTION
+		void print();
+
+		static constexpr impl::formatter_constants constants = {
+			//
+			format_flags::quote_dates_and_times | format_flags::indentation, // mandatory
+			format_flags::allow_multi_line_strings,							 // ignored
+			".inf"sv,
+			"-.inf"sv,
+			".NAN"sv,
+			"true"sv,
+			"false"sv
+		};
+
+		/// \endcond
+
+	  public:
+		/// \brief	The default flags for a yaml_formatter.
+		static constexpr format_flags default_flags = constants.mandatory_flags			  //
+													| format_flags::allow_literal_strings //
+													| format_flags::allow_unicode_strings //
+													| format_flags::allow_octal_integers  //
+													| format_flags::allow_hexadecimal_integers;
+
+		/// \brief	Constructs a YAML formatter and binds it to a TOML object.
+		///
+		/// \param 	source	The source TOML object.
+		/// \param 	flags 	Format option flags.
+		TOML_NODISCARD_CTOR
+		explicit yaml_formatter(const toml::node& source, format_flags flags = default_flags) noexcept
+			: base{ &source, nullptr, constants, { flags, "  "sv } }
+		{}
+
+#if TOML_DOXYGEN || (TOML_ENABLE_PARSER && !TOML_EXCEPTIONS)
+
+		/// \brief	Constructs a YAML formatter and binds it to a toml::parse_result.
+		///
+		/// \availability This constructor is only available when exceptions are disabled.
+		///
+		/// \attention Formatting a failed parse result will simply dump the error message out as-is.
+		///		This will not be valid YAML, but at least gives you something to log or show up in diagnostics:
+		/// \cpp
+		/// std::cout << toml::yaml_formatter{ toml::parse("a = 'b'"sv) } // ok
+		///           << "\n\n"
+		///           << toml::yaml_formatter{ toml::parse("a = "sv) } // malformed
+		///           << "\n";
+		/// \ecpp
+		/// \out
+		/// a: b
+		///
+		/// Error while parsing key-value pair: encountered end-of-file
+		///         (error occurred at line 1, column 5)
+		/// \eout
+		/// Use the library with exceptions if you want to avoid this scenario.
+		///
+		/// \param 	result	The parse result.
+		/// \param 	flags 	Format option flags.
+		TOML_NODISCARD_CTOR
+		explicit yaml_formatter(const toml::parse_result& result, format_flags flags = default_flags) noexcept
+			: base{ nullptr, &result, constants, { flags, "  "sv } }
+		{}
+
+#endif
+
+		/// \brief	Prints the bound TOML object out to the stream as YAML.
+		friend std::ostream& TOML_CALLCONV operator<<(std::ostream& lhs, yaml_formatter& rhs)
+		{
+			rhs.attach(lhs);
+			rhs.print();
+			rhs.detach();
+			return lhs;
+		}
+
+		/// \brief	Prints the bound TOML object out to the stream as YAML (rvalue overload).
+		friend std::ostream& TOML_CALLCONV operator<<(std::ostream& lhs, yaml_formatter&& rhs)
+		{
+			return lhs << rhs; // as lvalue
+		}
+	};
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"
+#endif // TOML_ENABLE_FORMATTERS

third_party/toml++/include/toml++/impl/yaml_formatter.inl

@@ -0,0 +1,165 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include "preprocessor.hpp"
+//# {{
+#if !TOML_IMPLEMENTATION
+#error This is an implementation-only header.
+#endif
+//# }}
+#if TOML_ENABLE_FORMATTERS
+
+#include "yaml_formatter.hpp"
+#include "print_to_stream.hpp"
+#include "table.hpp"
+#include "array.hpp"
+#include "header_start.hpp"
+
+TOML_NAMESPACE_START
+{
+	TOML_EXTERNAL_LINKAGE
+	void yaml_formatter::print_yaml_string(const value<std::string>& str)
+	{
+		if (str->empty())
+		{
+			base::print(str);
+			return;
+		}
+
+		bool contains_newline = false;
+		for (auto c = str->c_str(), e = str->c_str() + str->length(); c < e && !contains_newline; c++)
+			contains_newline = *c == '\n';
+
+		if (contains_newline)
+		{
+			print_unformatted("|-"sv);
+
+			increase_indent();
+
+			auto line_end  = str->c_str() - 1u;
+			const auto end = str->c_str() + str->length();
+			while (line_end != end)
+			{
+				auto line_start = line_end + 1u;
+				line_end		= line_start;
+				for (; line_end != end && *line_end != '\n'; line_end++)
+					;
+
+				if TOML_LIKELY(line_start != line_end || line_end != end)
+				{
+					print_newline();
+					print_indent();
+					print_unformatted(std::string_view{ line_start, static_cast<size_t>(line_end - line_start) });
+				}
+			}
+
+			decrease_indent();
+		}
+		else
+			print_string(*str, false, true);
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void yaml_formatter::print(const toml::table& tbl, bool parent_is_array)
+	{
+		if (tbl.empty())
+		{
+			print_unformatted("{}"sv);
+			return;
+		}
+
+		increase_indent();
+
+		for (auto&& [k, v] : tbl)
+		{
+			if (!parent_is_array)
+			{
+				print_newline();
+				print_indent();
+			}
+			parent_is_array = false;
+
+			print_string(k.str(), false, true);
+			if (terse_kvps())
+				print_unformatted(":"sv);
+			else
+				print_unformatted(": "sv);
+
+			const auto type = v.type();
+			TOML_ASSUME(type != node_type::none);
+			switch (type)
+			{
+				case node_type::table: print(*reinterpret_cast<const table*>(&v)); break;
+				case node_type::array: print(*reinterpret_cast<const array*>(&v)); break;
+				case node_type::string: print_yaml_string(*reinterpret_cast<const value<std::string>*>(&v)); break;
+				default: print_value(v, type);
+			}
+		}
+
+		decrease_indent();
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void yaml_formatter::print(const toml::array& arr, bool parent_is_array)
+	{
+		if (arr.empty())
+		{
+			print_unformatted("[]"sv);
+			return;
+		}
+
+		increase_indent();
+
+		for (auto&& v : arr)
+		{
+			if (!parent_is_array)
+			{
+				print_newline();
+				print_indent();
+			}
+			parent_is_array = false;
+
+			print_unformatted("- "sv);
+
+			const auto type = v.type();
+			TOML_ASSUME(type != node_type::none);
+			switch (type)
+			{
+				case node_type::table: print(*reinterpret_cast<const table*>(&v), true); break;
+				case node_type::array: print(*reinterpret_cast<const array*>(&v), true); break;
+				case node_type::string: print_yaml_string(*reinterpret_cast<const value<std::string>*>(&v)); break;
+				default: print_value(v, type);
+			}
+		}
+
+		decrease_indent();
+	}
+
+	TOML_EXTERNAL_LINKAGE
+	void yaml_formatter::print()
+	{
+		if (dump_failed_parse_result())
+			return;
+
+		switch (auto source_type = source().type())
+		{
+			case node_type::table:
+				decrease_indent(); // so root kvps and tables have the same indent
+				print(*reinterpret_cast<const table*>(&source()));
+				break;
+
+			case node_type::array: print(*reinterpret_cast<const array*>(&source())); break;
+
+			case node_type::string: print_yaml_string(*reinterpret_cast<const value<std::string>*>(&source())); break;
+
+			default: print_value(source(), source_type);
+		}
+	}
+}
+TOML_NAMESPACE_END;
+
+#include "header_end.hpp"
+#endif // TOML_ENABLE_FORMATTERS

third_party/toml++/include/toml++/toml.h

@@ -0,0 +1,7 @@
+// this file is just for backwards compatibility.
+#ifndef TOMLPLUSPLUS_H
+#define TOMLPLUSPLUS_H
+
+#include "toml.hpp"
+
+#endif

third_party/toml++/include/toml++/toml.hpp

@@ -0,0 +1,231 @@
+//# This file is a part of toml++ and is subject to the the terms of the MIT license.
+//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+#ifndef TOMLPLUSPLUS_HPP
+#define TOMLPLUSPLUS_HPP
+
+#define INCLUDE_TOMLPLUSPLUS_H // old guard name used pre-v3
+#define TOMLPLUSPLUS_H		   // guard name used in the legacy toml.h
+
+#include "impl/preprocessor.hpp"
+
+TOML_PUSH_WARNINGS;
+TOML_DISABLE_SPAM_WARNINGS;
+TOML_DISABLE_SWITCH_WARNINGS;
+TOML_DISABLE_SUGGEST_ATTR_WARNINGS;
+
+// misc warning false-positives
+#if TOML_MSVC
+#pragma warning(disable : 5031) // #pragma warning(pop): likely mismatch
+#if TOML_SHARED_LIB
+#pragma warning(disable : 4251) // dll exports for std lib types
+#endif
+#elif TOML_CLANG
+TOML_PRAGMA_CLANG(diagnostic ignored "-Wheader-hygiene")
+#if TOML_CLANG >= 12
+TOML_PRAGMA_CLANG(diagnostic ignored "-Wc++20-extensions")
+#endif
+#if TOML_CLANG == 13
+TOML_PRAGMA_CLANG(diagnostic ignored "-Wreserved-identifier")
+#endif
+#endif
+
+#include "impl/std_new.hpp"
+#include "impl/std_string.hpp"
+#include "impl/std_optional.hpp"
+#include "impl/forward_declarations.hpp"
+#include "impl/print_to_stream.hpp"
+#include "impl/source_region.hpp"
+#include "impl/date_time.hpp"
+#include "impl/at_path.hpp"
+#include "impl/path.hpp"
+#include "impl/node.hpp"
+#include "impl/node_view.hpp"
+#include "impl/value.hpp"
+#include "impl/make_node.hpp"
+#include "impl/array.hpp"
+#include "impl/key.hpp"
+#include "impl/table.hpp"
+#include "impl/unicode_autogenerated.hpp"
+#include "impl/unicode.hpp"
+#include "impl/parse_error.hpp"
+#include "impl/parse_result.hpp"
+#include "impl/parser.hpp"
+#include "impl/formatter.hpp"
+#include "impl/toml_formatter.hpp"
+#include "impl/json_formatter.hpp"
+#include "impl/yaml_formatter.hpp"
+
+#if TOML_IMPLEMENTATION
+
+#include "impl/std_string.inl"
+#include "impl/print_to_stream.inl"
+#include "impl/node.inl"
+#include "impl/at_path.inl"
+#include "impl/path.inl"
+#include "impl/array.inl"
+#include "impl/table.inl"
+#include "impl/unicode.inl"
+#include "impl/parser.inl"
+#include "impl/formatter.inl"
+#include "impl/toml_formatter.inl"
+#include "impl/json_formatter.inl"
+#include "impl/yaml_formatter.inl"
+
+#endif // TOML_IMPLEMENTATION
+
+TOML_POP_WARNINGS;
+
+// macro hygiene
+#if TOML_UNDEF_MACROS
+#undef TOML_ABI_NAMESPACE_BOOL
+#undef TOML_ABI_NAMESPACE_END
+#undef TOML_ABI_NAMESPACE_START
+#undef TOML_ABI_NAMESPACES
+#undef TOML_ABSTRACT_INTERFACE
+#undef TOML_ALWAYS_INLINE
+#undef TOML_ANON_NAMESPACE
+#undef TOML_ANON_NAMESPACE_END
+#undef TOML_ANON_NAMESPACE_START
+#undef TOML_ARCH_AMD64
+#undef TOML_ARCH_ARM
+#undef TOML_ARCH_ARM32
+#undef TOML_ARCH_ARM64
+#undef TOML_ARCH_BITNESS
+#undef TOML_ARCH_ITANIUM
+#undef TOML_ARCH_X64
+#undef TOML_ARCH_X86
+#undef TOML_ASSERT
+#undef TOML_ASSERT_ASSUME
+#undef TOML_ASSUME
+#undef TOML_ASYMMETRICAL_EQUALITY_OPS
+#undef TOML_ATTR
+#undef TOML_CLANG
+#undef TOML_CLANG_VERSION
+#undef TOML_CLOSED_ENUM
+#undef TOML_CLOSED_FLAGS_ENUM
+#undef TOML_COMPILER_HAS_EXCEPTIONS
+#undef TOML_COMPILER_HAS_RTTI
+#undef TOML_CONST
+#undef TOML_CONST_GETTER
+#undef TOML_CONST_INLINE_GETTER
+#undef TOML_CONSTRAINED_TEMPLATE
+#undef TOML_CPP
+#undef TOML_DECLSPEC
+#undef TOML_DELETE_DEFAULTS
+#undef TOML_DISABLE_ARITHMETIC_WARNINGS
+#undef TOML_DISABLE_CODE_ANALYSIS_WARNINGS
+#undef TOML_DISABLE_SPAM_WARNINGS
+#undef TOML_DISABLE_SPAM_WARNINGS_CLANG_10
+#undef TOML_DISABLE_SPAM_WARNINGS_CLANG_11
+#undef TOML_DISABLE_SUGGEST_ATTR_WARNINGS
+#undef TOML_DISABLE_SWITCH_WARNINGS
+#undef TOML_DISABLE_WARNINGS
+#undef TOML_DOXYGEN
+#undef TOML_EMPTY_BASES
+#undef TOML_ENABLE_IF
+#undef TOML_ENABLE_WARNINGS
+#undef TOML_EVAL_BOOL_0
+#undef TOML_EVAL_BOOL_1
+#undef TOML_EXTERNAL_LINKAGE
+#undef TOML_FLAGS_ENUM
+#undef TOML_FLOAT_CHARCONV
+#undef TOML_FLOAT128
+#undef TOML_FLOAT16_DIG
+#undef TOML_FLOAT16_LIMITS_SET
+#undef TOML_FLOAT16_MANT_DIG
+#undef TOML_FLOAT16_MAX_10_EXP
+#undef TOML_FLOAT16_MAX_EXP
+#undef TOML_FLOAT16_MIN_10_EXP
+#undef TOML_FLOAT16_MIN_EXP
+#undef TOML_GCC
+#undef TOML_GCC_LIKE
+#undef TOML_HAS_ATTR
+#undef TOML_HAS_BUILTIN
+#undef TOML_HAS_CHAR8
+#undef TOML_HAS_CPP_ATTR
+#undef TOML_HAS_CUSTOM_OPTIONAL_TYPE
+#undef TOML_HAS_FEATURE
+#undef TOML_HAS_INCLUDE
+#undef TOML_HAS_SSE2
+#undef TOML_HAS_SSE4_1
+#undef TOML_HIDDEN_CONSTRAINT
+#undef TOML_ICC
+#undef TOML_ICC_CL
+#undef TOML_IMPL_NAMESPACE_END
+#undef TOML_IMPL_NAMESPACE_START
+#undef TOML_IMPLEMENTATION
+#undef TOML_INCLUDE_WINDOWS_H
+#undef TOML_INLINE_GETTER
+#undef TOML_INT_CHARCONV
+#undef TOML_INT128
+#undef TOML_INTELLISENSE
+#undef TOML_INTERNAL_LINKAGE
+#undef TOML_LANG_AT_LEAST
+#undef TOML_LANG_EFFECTIVE_VERSION
+#undef TOML_LANG_HIGHER_THAN
+#undef TOML_LANG_UNRELEASED
+#undef TOML_LAUNDER
+#undef TOML_LIFETIME_HOOKS
+#undef TOML_LIKELY
+#undef TOML_LIKELY_CASE
+#undef TOML_LINUX
+#undef TOML_MAKE_FLAGS
+#undef TOML_MAKE_FLAGS_
+#undef TOML_MAKE_FLAGS_1
+#undef TOML_MAKE_FLAGS_2
+#undef TOML_MAKE_STRING
+#undef TOML_MAKE_STRING_1
+#undef TOML_MAKE_VERSION
+#undef TOML_MSVC
+#undef TOML_MSVC_LIKE
+#undef TOML_NAMESPACE
+#undef TOML_NEVER_INLINE
+#undef TOML_NODISCARD
+#undef TOML_NODISCARD_CTOR
+#undef TOML_OPEN_ENUM
+#undef TOML_OPEN_FLAGS_ENUM
+#undef TOML_PARSER_TYPENAME
+#undef TOML_POP_WARNINGS
+#undef TOML_PRAGMA_CLANG
+#undef TOML_PRAGMA_CLANG_GE_10
+#undef TOML_PRAGMA_CLANG_GE_11
+#undef TOML_PRAGMA_CLANG_GE_8
+#undef TOML_PRAGMA_CLANG_GE_9
+#undef TOML_PRAGMA_GCC
+#undef TOML_PRAGMA_ICC
+#undef TOML_PRAGMA_MSVC
+#undef TOML_PURE
+#undef TOML_PURE_GETTER
+#undef TOML_PURE_INLINE_GETTER
+#undef TOML_PUSH_WARNINGS
+#undef TOML_REQUIRES
+#undef TOML_RETURN_BOOL_FROM_FOR_EACH_BROKEN
+#undef TOML_RETURN_BOOL_FROM_FOR_EACH_BROKEN_MESSAGE
+#undef TOML_SA_LIST_BEG
+#undef TOML_SA_LIST_END
+#undef TOML_SA_LIST_NEW
+#undef TOML_SA_LIST_NXT
+#undef TOML_SA_LIST_SEP
+#undef TOML_SA_NATIVE_VALUE_TYPE_LIST
+#undef TOML_SA_NEWLINE
+#undef TOML_SA_NODE_TYPE_LIST
+#undef TOML_SA_UNWRAPPED_NODE_TYPE_LIST
+#undef TOML_SA_VALUE_EXACT_FUNC_MESSAGE
+#undef TOML_SA_VALUE_FUNC_MESSAGE
+#undef TOML_SA_VALUE_MESSAGE_CONST_CHAR8
+#undef TOML_SA_VALUE_MESSAGE_U8STRING_VIEW
+#undef TOML_SA_VALUE_MESSAGE_WSTRING
+#undef TOML_SIMPLE_STATIC_ASSERT_MESSAGES
+#undef TOML_TRIVIAL_ABI
+#undef TOML_UINT128
+#undef TOML_UNIX
+#undef TOML_UNLIKELY
+#undef TOML_UNLIKELY_CASE
+#undef TOML_UNREACHABLE
+#undef TOML_UNUSED
+#undef TOML_WINDOWS
+#endif
+
+#endif // TOMLPLUSPLUS_HPP