Popularity
9.5
Stable
Activity
0.0
Declining
144
14
34

Monthly Downloads: 35
Programming language: JavaScript
License: MIT License
Tags: Haskell     Tree-sitter    
Latest version: v0.13.0

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README

tree-sitter-haskell

CI

Haskell grammar for tree-sitter.

References

Building with nvim-treesitter

When installing the grammar from source, be sure to include the scanner in the source files:

lua <<EOF
local parser_config = require "nvim-treesitter.parsers".get_parser_configs()
parser_config.haskell = {
  install_info = {
    url = "~/path/to/tree-sitter-haskell",
    files = {"src/parser.c", "src/scanner.c"}
  }
}
EOF

Supported Language Extensions

These extensions are supported ✅, unsupported ❌ or not applicable because they don't involve parsing ➖️:

  • AllowAmbiguousTypes ➖️
  • ApplicativeDo ➖️
  • Arrows ❌
  • BangPatterns ✅
  • BinaryLiterals ✅
  • BlockArguments ✅
  • CApiFFI ✅
  • ConstrainedClassMethods ✅
  • ConstraintKinds ✅
  • CPP ✅
  • CUSKs ✅
  • DataKinds ✅
  • DatatypeContexts ✅
  • DefaultSignatures ✅
  • DeriveAnyClass ➖️
  • DeriveDataTypeable ➖️
  • DeriveFoldable ➖️
  • DeriveFunctor ➖️
  • DeriveGeneric ➖️
  • DeriveLift ➖️
  • DeriveTraversable ➖️
  • DerivingStrategies ✅
  • DerivingVia ✅
  • DisambiguateRecordFields ➖️
  • DuplicateRecordFields ➖️
  • EmptyCase ✅
  • EmptyDataDecls ✅
  • EmptyDataDeriving ✅
  • ExistentialQuantification ✅
  • ExplicitForAll ✅
  • ExplicitNamespaces ✅
  • ExtendedDefaultRules ➖️
  • FlexibleContexts ✅
  • FlexibleInstances ✅
  • ForeignFunctionInterface ✅
  • FunctionalDependencies ✅
  • GADTs ✅
  • GADTSyntax ✅
  • GeneralisedNewtypeDeriving ➖️
  • GHCForeignImportPrim ✅
  • Haskell2010 ➖️
  • Haskell98 ➖️
  • HexFloatLiterals ✅
  • ImplicitParams ✅
  • ImplicitPrelude ➖️
  • ImportQualifiedPost ✅
  • ImpredicativeTypes ➖️
  • IncoherentInstances ➖️
  • InstanceSigs ✅
  • InterruptibleFFI ✅
  • KindSignatures ✅
  • LambdaCase ✅
  • LexicalNegation ❌
  • LiberalTypeSynonyms ✅
  • LinearTypes ✅
  • MagicHash ✅
  • Modifiers ❌
  • MonadComprehensions ➖️
  • MonadFailDesugaring ➖️
  • MonoLocalBinds ➖️
  • MonomorphismRestriction ➖️
  • MultiParamTypeClasses ✅
  • MultiWayIf ✅
  • NamedFieldPuns ✅
  • NamedWildCards ✅
  • NegativeLiterals ➖️
  • NondecreasingIndentation ❌
  • NPlusKPatterns ➖️
  • NullaryTypeClasses ✅
  • NumDecimals ➖️
  • NumericUnderscores ✅
  • OverlappingInstances ➖️
  • OverloadedLabels ✅
  • OverloadedLists ➖️
  • OverloadedStrings ➖️
  • PackageImports ✅
  • ParallelListComp ✅
  • PartialTypeSignatures ✅
  • PatternGuards ✅
  • PatternSynonyms ✅
  • PolyKinds ➖️
  • PostfixOperators ➖️
  • QualifiedDo ✅
  • QuantifiedConstraints ✅
  • QuasiQuotes ✅
  • Rank2Types ✅
  • RankNTypes ✅
  • RebindableSyntax ➖️
  • RecordWildCards ➖️
  • RecursiveDo ✅
  • RoleAnnotations ✅
  • Safe ➖️
  • ScopedTypeVariables ✅
  • StandaloneDeriving ✅
  • StandaloneKindSignatures ✅
  • StarIsType ✅
  • StaticPointers ❌
  • Strict ➖️
  • StrictData ➖️
  • TemplateHaskell ✅
  • TemplateHaskellQuotes ✅
  • TraditionalRecordSyntax ➖️
  • TransformListComp ✅
  • Trustworthy ➖️
  • TupleSections ✅
  • TypeApplications ✅
  • TypeFamilies ✅
  • TypeFamilyDependencies ✅
  • TypeInType ✅
  • TypeOperators ✅
  • TypeSynonymInstances ➖️
  • UnboxedSums ✅
  • UnboxedTuples ✅
  • UndecidableInstances ➖️
  • UndecidableSuperClasses ➖️
  • UnicodeSyntax ✅
  • UnliftedFFITypes ➖️
  • UnliftedNewtypes ✅
  • Unsafe ➖️
  • ViewPatterns ✅

Bugs

CPP

Preprocessor #elif and #else directives cannot be handled correctly, since the parser state would have to be manually reset to what it was at the #if. As a workaround, the code blocks in the alternative branches are parsed as part of the directives.

Layout

NondecreasingIndentation is not supported (yet?).

Operators on newlines in do

A strange edge case is when an infix operator follows an expression statement of a do block with an indent of less or equal the do's layout column:

f = do
  readSomething
  >>= doSomething

The >>= causes the do's layout to be terminated, resulting in an AST similar to

f = (do readSomething) >>= doSomething

This is checked heuristically, probably unreliably.

Testing

Requires: tree-sitter(-cli)

Run test corpus

These are stored in ./tests/corpus/

$ tree-sitter test

Test parsing an example codebase

Requires: bc
This will print the percentage of the codebase parsed, and the time taken

$ ./script/parse-examples             # this clones all repos
$ ./script/parse-example <example>    # where <example> is a project under ./examples/

Enable scanner debug output

To get an extra-verbose scanner, unoptimized, with debug symbols:

$ CFLAGS='-DDEBUG' make debug.so
$ cp debug.so $HOME/.cache/tree-sitter/lib/haskell.so    # So `tree-sitter-cli` uses our binary
$ tree-sitter test
$ ./script/parse-example <example>

If you want to debug the scanner with gdb, you can b tree_sitter_haskell_external_scanner_scan with tree-sitter test.

Create visual graph of parser steps

Requires: graphviz

$ tree-sitter parse -D test/Basic.hs    # Produces log.html