2219fd22bb
- added `toml::is_number<>` - added `toml::node_type::none` - added initializer_list and vector relops to `toml::array` - added constructors for `time_offset` and `date_time` - added much to `node_view` - added tests for `node_view` value relops - added lots more documentation - removed `time_offset::from_hh_mm` - removed the handling of `\s` literals (looks like it's not going be accepted as-is)
196 lines
9.2 KiB
Markdown
196 lines
9.2 KiB
Markdown
# toml++ (tomlplusplus)
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[][cpp_compilers]
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[][v0.5.0]
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[](https://circleci.com/gh/marzer/tomlplusplus)
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[](https://github.com/marzer/tomlplusplus/blob/master/LICENSE)
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`toml++` is a header-only toml parser and serializer for C++17, C++20 and whatever comes after.
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<br>
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# Example
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Given a TOML file `configuration.toml` containing the following:
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```toml
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[library]
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name = "toml++"
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version = "0.1.0"
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authors = ["Mark Gillard <mark@notarealwebsite.com>"]
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[dependencies]
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cpp = 17
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```
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Reading it in C++ is easy with `toml++`:
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```cpp
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auto config = toml::parse_file( "configuration.toml" );
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// get key-value pairs
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std::string_view library_name = config["library"]["name"].as_string()->get();
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std::string_view library_version = config["library"]["version"].as_string()->get();
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std::string_view library_author = config["library"]["authors"][0].as_string()->get();
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int64_t depends_on_cpp_version = config["dependencies"]["cpp"].as_integer()->get();
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// modify the data
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config.insert_or_assign("alternatives", toml::array{
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"cpptoml",
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"toml11",
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"Boost.TOML"
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});
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// iterate & visit over the data
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for (auto [k, v] : config)
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{
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v.visit([](auto& node) noexcept
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{
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std::cout << node << std:endl;
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if constexpr (toml::is_string<decltype(node)>)
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do_something_with_string_values(node);
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});
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}
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// re-serialize as TOML
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std::cout << config << std::endl;
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// re-serialize as JSON
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std::cout << toml::json_formatter{ config } << std::endl;
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```
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You'll find some more code examples in the `examples` directory, and plenty more as part of the [API documentation].
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<br>
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# Adding toml++ to your project
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`toml++` comes in two flavours: Regular and Single-header.
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### Regular mode
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1. Add `tomlplusplus/include` to your include paths
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2. `#include <toml++/toml.h>`
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### Single-header mode
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1. Drop `toml.hpp` wherever you like in your source tree
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2. There is no step two
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The API is the same regardless of how you consume the library.
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### Configuration
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A number of configurable options are exposed in the form of preprocessor `#defines`. Most likely you
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won't need to mess with these at all, butif you do, set them before including toml++.
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| Option | Type | Default | Description |
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|----------------------------|:--------------:|-----------------------------------|----------------------------------------------------------------------------------------------------------|
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| `TOML_ASSERT(expr)` | function macro | `assert(expr)`<br>(or undefined) | Sets the assert function used by the library. |
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| `TOML_CHAR_8_STRINGS` | boolean | `0` | Uses C++20 [char8_t]-based strings as the toml string data type. |
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| `TOML_CONFIG_HEADER` | string literal | undefined | Includes the given header file before the rest of the library. |
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| `TOML_LARGE_FILES` | boolean | `0` | Uses 32-bit integers for line and column indices (instead of 16-bit). |
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| `TOML_SMALL_FLOAT_TYPE` | type name | undefined | If your codebase has an additional 'small' float type (e.g. half-precision), this tells toml++ about it. |
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| `TOML_SMALL_INT_TYPE` | type name | undefined | If your codebase has an additional 'small' integer type (e.g. 24-bits), this tells toml++ about it. |
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| `TOML_UNDEF_MACROS` | boolean | `1` | `#undefs` the library's internal macros at the end of the header. |
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| `TOML_UNRELEASED_FEATURES` | boolean | `1` | Enables support for [unreleased TOML language features] not yet part of a [numbered version]. |
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<br>
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# TOML Language Support
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At any given time `toml++` aims to implement whatever the [numbered version] of TOML is, with the
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addition of unreleased features from the [TOML master] and some sane cherry-picks from the
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[TOML issues list] where the discussion strongly indicates inclusion in a near-future release.
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The library advertises the most recent numbered language version it fully supports via the preprocessor
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defines `TOML_LANG_MAJOR`, `TOML_LANG_MINOR` and `TOML_LANG_PATCH`.
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### **🔸Unreleased TOML features:**
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- [#356]: Allow leading zeros in the exponent part of a float
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- [#516]: Allow newlines and trailing commas in inline tables
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- [#562]: Allow hex floatingpoint values
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- [#567]: Clarify that control characters are not permitted in comments
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- [#571]: Allow raw tabs inside strings
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- [#644]: Support `+` in key names
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- [#665]: Make arrays heterogeneous
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- [#671]: Local time of day format should support `09:30` as opposed to `09:30:00`
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- [#687]: Relax bare key restrictions to allow additional unicode characters
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_These can be disabled (and thus strict [TOML v0.5.0] compliance enforced) by specifying
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`TOML_UNRELEASED_FEATURES = 0` (see [Configuration](#Configuration))._
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### **🔹TOML v0.5.0 and earlier:**
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- All features supported.
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<br>
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# Contributing
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Contributions are welcome, either by [reporting issues](https://github.com/marzer/tomlplusplus/issues)
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or submitting pull requests. If you wish to submit a PR, please be aware that:
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- The single-header file `toml.hpp` is generated by a script; make your changes in the files in
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`include`, **not** in `toml.hpp`.
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- Your changes should compile warning-free on at least one of gcc 8.3.0, clang 8.0, and MSVC 19.2X
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(Visual Studio 2019). All three is a bonus.
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- You should regenerate the single-header file as part of your PR (a CI check will fail if you don't).
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### Regenerating toml.hpp
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1. Make your changes as necessary
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2. If you've added a new header file that isn't going to be transitively included by one of the
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others, add an include directive to `include/toml++/toml.h`
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3. Run `python/generate_single_header.py`
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### Building and testing
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Testing is done using [Catch2], included in the respository as a submodule under `extern/Catch2`.
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The first time you want to begin testing you'll need to ensure submodules have been fetched:
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```bash
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git submodule update --init --recursive extern/Catch2
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```
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#### Windows
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Install [Visual Studio 2019] and [Test Adapter for Catch2], then open `vs/toml++.sln` and build the
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projects in the `tests` solution folder. Visual Studio's Test Explorer should pick these up and
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allow you to run the tests directly.
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If test discovery fails you can usually fix it by clicking enabling
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`Auto Detect runsettings Files` (settings gear icon > `Configure Run Settings`).
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#### Linux
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Install [meson] and [ninja] if necessary, then test with both gcc and clang:
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```bash
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CXX=g++ meson build-gcc
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CXX=clang++ meson build-clang
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cd build-gcc && ninja && ninja test
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cd ../build-clang && ninja && ninja test
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```
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<br>
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# License and Attribution
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`toml++` is licensed under the terms of the MIT license - see [LICENSE].
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UTF-8 decoding is performed using a state machine based on Bjoern Hoehrmann's '[Flexible and Economical UTF-8 Decoder]',
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which is also subject to the terms of the MIT license - see [LICENSE-utf8-decoder].
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[API documentation]: https://marzer.github.io/tomlplusplus/
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[unreleased TOML language features]: https://github.com/marzer/tomlplusplus#unreleased-features
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[numbered version]: https://github.com/toml-lang/toml/releases
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[char8_t]: https://en.cppreference.com/w/cpp/keyword/char8_t
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[TOML master]: https://github.com/toml-lang/toml/blob/master/README.md
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[TOML issues list]: https://github.com/toml-lang/toml/issues
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[TOML v0.5.0]: https://github.com/toml-lang/toml/blob/master/versions/en/toml-v0.5.0.md
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[v0.5.0]: https://github.com/toml-lang/toml/blob/master/versions/en/toml-v0.5.0.md
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[LICENSE]: https://github.com/marzer/tomlplusplus/blob/master/LICENSE
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[Flexible and Economical UTF-8 Decoder]: http://bjoern.hoehrmann.de/utf-8/decoder/dfa/
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[meson]: https://mesonbuild.com/Getting-meson.html
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[ninja]: https://github.com/ninja-build/ninja/wiki/Pre-built-Ninja-packages
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[Catch2]: https://github.com/catchorg/Catch2
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[Test Adapter for Catch2]: https://marketplace.visualstudio.com/items?itemName=JohnnyHendriks.ext01
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[Visual Studio 2019]: https://visualstudio.microsoft.com/vs/
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[cpp_compilers]: https://en.cppreference.com/w/cpp/compiler_support
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[#356]: https://github.com/toml-lang/toml/issues/356
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[#516]: https://github.com/toml-lang/toml/issues/516
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[#562]: https://github.com/toml-lang/toml/issues/562
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[#567]: https://github.com/toml-lang/toml/issues/567
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[#571]: https://github.com/toml-lang/toml/issues/571
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[#622]: https://github.com/toml-lang/toml/issues/622
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[#644]: https://github.com/toml-lang/toml/issues/644
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[#665]: https://github.com/toml-lang/toml/issues/665
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[#671]: https://github.com/toml-lang/toml/issues/671
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[#687]: https://github.com/toml-lang/toml/issues/687
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[LICENSE-utf8-decoder]: https://github.com/marzer/tomlplusplus/blob/master/LICENSE-utf8-decoder
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