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goodbye a la carte

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Ayman Nadeem 2020-04-17 13:56:45 -04:00
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docs/adding-new-languages.md
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@ -10,7 +10,6 @@ Please note that this list of steps reflects the state of Semantic as is, not wh
2. **Create a Haskell library providing an interface to that C source.** The [`haskell-tree-sitter`](https://github.com/tree-sitter/haskell-tree-sitter) repository provides a Cabal package for each supported language. You can find an example of a pull request to add such a package here. Each package needs to provide two API surfaces:
* a bridged (via the FFI) reference to the toplevel parser in the generated file ([example](https://github.com/tree-sitter/haskell-tree-sitter/blob/master/tree-sitter-json/internal/TreeSitter/JSON/Internal.hs))
* symbol datatypes for each syntax node in the parser, generated with the `mkSymbolDatatype` Template Haskell splice ([example](https://github.com/github/semantic/blob/master/semantic-json/src/Language/JSON/Grammar.hs)). For more information, see [CodeGen docs](https://github.com/github/semantic/blob/master/semantic-ast/README.md).
3. **Identify the new syntax nodes required to represent your language.** While we provide an extensive library of reusable AST nodes for [literals](https://github.com/github/semantic/blob/master/src/Data/Syntax/Literal.hs), [expressions](https://github.com/github/semantic/blob/master/src/Data/Syntax/Expression.hs), [statements](https://github.com/github/semantic/blob/master/src/Data/Syntax/Statement.hs), and [types](https://github.com/github/semantic/blob/master/src/Data/Syntax/Type.hs), most languages will require some syntax nodes not found in other languages. You'll need to create a new module providing those data types, and those data types must be written as an open union: [here](https://github.com/github/semantic/commits/master/src/Language/Ruby/Syntax.hs?author=charliesome) is an example for Ruby's syntactic details.
4. **Write an assignment step that translates tree-sitter trees into Haskell datatypes.** More information about this can be found in the [assignment documentation](assignment.md). This is currently the most time-consuming and error-prone part of the process (see [https://github.com/github/semantic/issues/77]).
5. **Implement `Evaluatable` instances and add new [`Value` effects](https://github.com/github/semantic/blob/master/src/Control/Abstract/Value.hs) as is needed to describe the control flow of your language.** While several features of Semantic (e.g. `semantic parse --symbols` and `semantic diff`) will become fully available given a working assignment step, further features based on concrete or abstract interpretation (such as `semantic graph`) require implementing the `Evaluatable` typeclass and providing value-style effects for each control flow feature provided by the language. This means that language support is a spectrum: Semantic can provide useful information without any knowledge of a language's semantics, but each successive addition to its interpretive capabilities enables more functionality.
6. **Add tests for diffing, tagging, graphing, and evaluating code written in that language.** Because tree-sitter grammars often change, we require extensive testing so as to avoid the unhappy situation of bitrotted languages that break as soon as a new grammar comes down the line.