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Patrick Thomson
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Merge branch 'master' into lingo
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‎docs/adding-new-languages.md‎

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@@ -7,7 +7,7 @@ Please note that this list of steps reflects the state of Semantic as is, not wh
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## The procedure
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1. **Find or write a [tree-sitter](https://tree-sitter.github.io) parser for your language.** The tree-sitter [organization page](https://github.com/tree-sitter) has a number of parsers beyond those we currently support in Semantic; look there first to make sure you're not duplicating work. The tree-sitter [documentation on creating parsers](http://tree-sitter.github.io/tree-sitter/creating-parsers) provides an exhaustive look at the process of developing and debugging tree-sitter parsers. Though we do not support grammars written with other toolkits such as [ANTLR](https://www.antlr.org), translating an ANTLR or other BNF-style grammar into a tree-sitter grammar is usually straightforward.
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2. **Create a Haskell library providing an interface to that C source.** The [`haskell-tree-sitter`](https://github.com/tree-sitter/haskell-tree-sitter/tree/master/languages) 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:
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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:
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* 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))
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* symbol datatypes for each syntax node in the parser, generated with the `mkSymbolDatatype` Template Haskell splice ([example](https://github.com/tree-sitter/haskell-tree-sitter/blob/master/tree-sitter-json/TreeSitter/JSON.hs))
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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.

‎src/Language/TSX/Assignment.hs‎

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jsxAttribute' = jsxAttribute <|> jsxExpression'
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jsxOpeningElement' :: Assignment Term
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jsxOpeningElement' = makeTerm <$> symbol Grammar.JsxOpeningElement <*> children (TSX.Syntax.JsxOpeningElement <$> term jsxElementName <*> manyTerm jsxAttribute')
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jsxOpeningElement' = makeTerm <$> symbol Grammar.JsxOpeningElement <*> children (TSX.Syntax.JsxOpeningElement <$> term jsxElementName <*> term (typeArguments' <|> emptyTerm) <*> manyTerm jsxAttribute')
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jsxElementName :: Assignment Term
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jsxElementName = choice [ identifier, nestedIdentifier, jsxNamespaceName ]

‎src/Language/TSX/Syntax/JSX.hs‎

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instance Evaluatable JsxExpression
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data JsxOpeningElement a = JsxOpeningElement { jsxOpeningElementIdentifier :: !a, jsxAttributes :: ![a] }
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data JsxOpeningElement a = JsxOpeningElement { jsxOpeningElementIdentifier :: !a, jsxOpeningElementTypeArguments :: a, jsxAttributes :: ![a] }
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deriving (Declarations1, Diffable, Eq, Foldable, FreeVariables1, Functor, Generic1, Hashable1, NFData1, Ord, Show, ToJSONFields1, Traversable)
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deriving (Eq1, Show1, Ord1) via Generically JsxOpeningElement
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‎src/Parsing/Parser.hs‎

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someASTParser Go = Just (SomeASTParser (ASTParser tree_sitter_go :: Parser (AST [] Go.Grammar)))
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someASTParser Haskell = Just (SomeASTParser (ASTParser tree_sitter_haskell :: Parser (AST [] Haskell.Grammar)))
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someASTParser Java = Just (SomeASTParser (ASTParser tree_sitter_java :: Parser (AST [] Java.Grammar)))
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someASTParser JavaScript = Just (SomeASTParser (ASTParser tree_sitter_typescript :: Parser (AST [] TypeScript.Grammar)))
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someASTParser JSON = Just (SomeASTParser (ASTParser tree_sitter_json :: Parser (AST [] JSON.Grammar)))
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someASTParser JSX = Just (SomeASTParser (ASTParser tree_sitter_typescript :: Parser (AST [] TypeScript.Grammar)))
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-- Use the TSX parser for `.js` and `.jsx` files in case they use Flow type-annotation syntax.
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-- The TSX and Flow syntaxes are the same, whereas the normal TypeScript syntax is different.
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someASTParser JavaScript = Just (SomeASTParser (ASTParser tree_sitter_tsx :: Parser (AST [] TSX.Grammar)))
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someASTParser JSX = Just (SomeASTParser (ASTParser tree_sitter_tsx :: Parser (AST [] TSX.Grammar)))
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someASTParser Python = Just (SomeASTParser (ASTParser tree_sitter_python :: Parser (AST [] Python.Grammar)))
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someASTParser Ruby = Just (SomeASTParser (ASTParser tree_sitter_ruby :: Parser (AST [] Ruby.Grammar)))
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someASTParser TypeScript = Just (SomeASTParser (ASTParser tree_sitter_typescript :: Parser (AST [] TypeScript.Grammar)))

‎test/fixtures/javascript/corpus/jsx.A.js‎

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function Something() {
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return <div>
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<Foo>hello</Foo>
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</div>;
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}

‎test/fixtures/javascript/corpus/jsx.B.js‎

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function Something() {
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return <div>
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<Foo<T>>goodbye</Foo>
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</div>;
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}

‎test/fixtures/javascript/corpus/jsx.diffA-B.txt‎

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(Statements
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(Function
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(Empty)
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(Empty)
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(Identifier)
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(StatementBlock
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(Return
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(JsxElement
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(JsxOpeningElement
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(Identifier)
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(Empty))
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(JsxText)
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(JsxElement
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(JsxOpeningElement
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(Identifier)
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{ (Empty)
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->(TypeArguments
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{+(TypeIdentifier)+}) })
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{ (JsxText)
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->(JsxText) }
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(JsxClosingElement
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(Identifier)))
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(JsxText)
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(JsxClosingElement
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(Identifier)))))))

‎test/fixtures/javascript/corpus/jsx.diffB-A.txt‎

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(Statements
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(Function
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(Empty)
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(Empty)
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(Identifier)
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(StatementBlock
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(Return
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(JsxElement
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(JsxOpeningElement
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(Identifier)
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(Empty))
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(JsxText)
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(JsxElement
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(JsxOpeningElement
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(Identifier)
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{ (TypeArguments
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{-(TypeIdentifier)-})
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->(Empty) })
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{ (JsxText)
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->(JsxText) }
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(JsxClosingElement
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(Identifier)))
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(JsxText)
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(JsxClosingElement
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(Identifier)))))))

‎test/fixtures/javascript/corpus/jsx.parseA.txt‎

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(Statements
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(Function
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(Empty)
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(Empty)
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(Identifier)
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(StatementBlock
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(Return
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(JsxElement
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(JsxOpeningElement
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(Identifier)
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(Empty))
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(JsxText)
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(JsxElement
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(JsxOpeningElement
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(Identifier)
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(Empty))
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(JsxText)
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(JsxClosingElement
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(Identifier)))
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(JsxText)
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(JsxClosingElement
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(Identifier)))))))

‎test/fixtures/javascript/corpus/jsx.parseB.txt‎

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(Statements
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(Function
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(Empty)
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(Empty)
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(Identifier)
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(StatementBlock
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(Return
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(JsxElement
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(JsxOpeningElement
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(Identifier)
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(Empty))
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(JsxText)
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(JsxElement
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(JsxOpeningElement
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(Identifier)
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(TypeArguments
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(TypeIdentifier)))
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(JsxText)
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(JsxClosingElement
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(Identifier)))
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(JsxText)
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(JsxClosingElement
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(Identifier)))))))

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