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109 lines
3.9 KiB
Markdown
109 lines
3.9 KiB
Markdown
# Contributing to Catala
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The project is open to external contributions, in the spirit of open source.
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If you want to open a pull request, please follow the instructions below.
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To ask a question to the Catala team, please open an issue on this repository.
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You can also join the [Zulip chat](https://zulip.catala-lang.org/) to ask
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any questions about the project.
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If you want to contribute to the project on a longer-term basis, or if you have
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specific competences as a socio-fiscal lawyer or a programming language specialist,
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please [contact the authors](mailto:contact@catala-lang.org).
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The Catala team meets over visioconference once every two weeks.
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Please note that the copyright of this code is owned by Inria;
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by contributing, you disclaim all copyright interests in favor of Inria.
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Both the code for the compiler and the examples in this repository are
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distributed under the Apache2 license.
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### Writing Catala code
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Before writing Catala code, please read the
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[tutorial](https://catala-lang.org/en/examples/tutorial). You can run the
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programs of the tutorial yourself by following the instruction in the
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[README of the `examples` directory](examples/README.md). Then, it is suggested
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that you create a new example directory again according to the instructions of
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this README.
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Let us now present the typical Catala workflow. First, you need to locate
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the legislative text that you want to use as a reference. Then, simply
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copy-paste the text into your source file.
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First you will have to format the copy-pasted text using Catala headings
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and articles markers:
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```markdown
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## Heading
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### Sub-heading (the more '#', the less important)
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#### [Legislative atom]
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```
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Please look at the code of other examples to see how to format things properly.
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While formatting the text, don't forget regularly to try and parse your example
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using for instance
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```
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make -C examples/foo foo.tex
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```
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to see if you've made any syntax errors. Once the text formatting is done, you
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can start to annotate each legislative atom (article, provision, etc.) with
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some Catala code. To open up a code section in Catala, simply use
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~~~markdown
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```catala
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# In code sections, comments start with #
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scope Foo:
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<your code goes here>
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```
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~~~
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While all the code sections are equivalent in terms of execution, you can
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mark some as "metadata" so that they are printed differently on lawyer-facing
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documents. Here's how it works:
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~~~markdown
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> Begin metadata # > Début métadonnées en français
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```catala
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declaration structure FooBar:
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data foo content boolean
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data bar content money
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<your structure/enumeration/scope declarations goes here>
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```
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> End metadata # > Fin métadonnées en français
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~~~
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Again, make sure to regularly check that your example is parsing correctly. The error message from the compiler should help you debug the syntax if need be. You can also
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live-test the programs you wrote by feeding them to the interpreter
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(see the [README of the `examples` directory](examples/README.md)); this will
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also type-check the programs, which is useful for debugging them.
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## Working on the compiler
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The Catala compiler is a standard dune-managed OCaml project.
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You can look at the
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[online OCaml documentation](https://catala-lang.org/ocaml_docs/) for the
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different modules' interfaces as well as high-level architecture documentation.
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## Internationalization
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The Catala language should be adapted to any legislative text that follows a
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general-to-specifics statutes order. Therefore, there exists multiple versions
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of the Catala surface syntax, adapted to the language of the legislative text.
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Currently, Catala supports English and French legislative text via the
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`--language=en` or `--language=fr` option.
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Technically, support for new languages can be added via a new lexer. If you want
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to add a new language, you can start from
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[existing lexer examples](src/catala/catala_surface/lexer_fr.ml), tweak and open
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a pull request. If you don't feel familiar enough with OCaml to do so, please
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leave an issue on this repository.
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