tree-sitter-haskell
Haskell grammar for tree-sitter
Decision gist · record as of 2026-08-14
Yes, if you are building a Haskell code analysis or editor tool and need incremental parsing. The grammar is comprehensive and actively maintained. However, install only if you already use tree-sitter; this package is a grammar plugin, not a standalone parser. Be aware that the last release was 642 days ago, so check whether recent language extensions you need are supported.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires tree-sitter core library and compiled parser binary; you must obtain or build the haskell.so parser library separately (not bundled by this package).
- Medium install friction due to compiled wheels; prebuilt binaries available for common platforms (x86_64, ARM, Windows).
- Package is aging—last release was 642 days ago, though the repository remains active with recent commits.
License · maintenance · safety
MIT (permissive) — MIT license is permissive; you may use, modify, and distribute this package freely in commercial and private projects with minimal restrictions.
last release 2024-11-10 (642 days) · last repo commit 2025-08-29 · 186 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 121,369 downloads/mo, #11,983 on PyPI
Alternatives
Verify before relying
pip install tree-sitter-haskell
from tree_sitter import Language, Parser
HASKELL = Language('/path/to/haskell.so')
parser = Parser()
parser.set_language(HASKELL)
tree = parser.parse(b'main = putStrLn "Hello"')- Whether the package includes precompiled parser binaries or requires manual compilation of the grammar.
- How to obtain or generate the haskell.so parser library needed by the usage example.
- Support status for GHC language extensions marked as unsupported (Arrows, LexicalNegation, Modifiers, StaticPointers).
What it is and what it does
tree-sitter-haskell is a parser grammar for the tree-sitter incremental parsing framework, targeting the Haskell language. It translates Haskell source code into a concrete syntax tree that tools can query and analyze. The grammar supports most modern Haskell features, including many GHC language extensions (BangPatterns, GADTs, TypeFamilies, TemplateHaskell, and many others), though a few extensions remain unsupported or are not applicable to parsing.
The package is primarily used by developers building code analysis tools, linters, refactoring engines, or editor integrations that need to understand Haskell syntax. It does not parse or execute Haskell code itself; it only produces a tree representation. The grammar includes supertypes (expression, pattern, type, declaration, statement, etc.) that allow queries to match nodes at different levels of abstraction, making it suitable for both simple token extraction and complex semantic queries.
Use it for
- Build a Haskell linter or style checker that traverses the syntax tree to detect code patterns.
- Implement editor features (syntax highlighting, code folding, go-to-definition) using tree-sitter queries.
- Create a code refactoring tool that identifies and transforms specific Haskell syntax patterns.
- Analyze Haskell codebases to extract metrics (function count, module dependencies, type usage).
- Develop a documentation generator that parses Haskell source to extract type signatures and comments.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you are building a Haskell code analysis or editor tool and need incremental parsing.
The grammar is comprehensive and actively maintained. However, install only if you already use tree-sitter; this package is a grammar plugin, not a standalone parser. Be aware that the last release was 642 days ago, so check whether recent language extensions you need are supported.
Install
tree-sitter-haskell on PyPI
Before you install
Medium install friction due to compiled wheels; prebuilt binaries available for common platforms (x86_64, ARM, Windows). Package is aging—last release was 642 days ago, though the repository remains active with recent commits.
Requires tree-sitter core library and compiled parser binary; you must obtain or build the haskell.so parser library separately (not bundled by this package).
License in practice
MIT license is permissive; you may use, modify, and distribute this package freely in commercial and private projects with minimal restrictions.
Quickstart
pip install tree-sitter-haskell
from tree_sitter import Language, Parser
HASKELL = Language('/path/to/haskell.so')
parser = Parser()
parser.set_language(HASKELL)
tree = parser.parse(b'main = putStrLn "Hello"')Verify before relying
- Whether the package includes precompiled parser binaries or requires manual compilation of the grammar.
- How to obtain or generate the haskell.so parser library needed by the usage example.
- Support status for GHC language extensions marked as unsupported (Arrows, LexicalNegation, Modifiers, StaticPointers).
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Medium. Platform-specific wheel |
| Runtime dependencies | None |
| Maintenance | Aging 642 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 121,369 / month, #11,983 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Intended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseTopic :: Software Development :: CompilersTopic :: Text Processing :: LinguisticTyping :: Typed |
Evidence: tree_sitter_haskell-0.23.1-cp39-abi3-macosx_10_9_x86_64.whl; tree_sitter_haskell-0.23.1-cp39-abi3-macosx_11_0_arm64.whl; tree_sitter_haskell-0.23.1-cp39-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl; tree_sitter_haskell-0.23.1-cp39-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl; tree_sitter_haskell-0.23.1-cp39-abi3-musllinux_1_2_x86_64.whl; tree_sitter_haskell-0.23.1-cp39-abi3-win_amd64.whl; tree_sitter_haskell-0.23.1-cp39-abi3-win_arm64.whl
Tags
Let your AI agent find packages like this
Example. Real query, live index.
You found this page by searching. An agent finds it by wishing: SkillFed indexes 14,416 PyPI packages by what they can do, searchable in plain language.
wish › “haskell parser tree-sitter”
- tree-sitter-haskellProvides a tree-sitter parser grammar for Haskell, enabling…
- tree-sitter-xmlProvides a tree-sitter parser grammar for XML and DTD files, enabling…
- tree-sitter-cssProvides a CSS grammar parser for tree-sitter, enabling incremental…
Give your agent the search over MCP, or paste the wish link into any chat.
More Linguistic packages
Detects and normalizes text encoding from unknown or ambiguous sources, supporting all IANA character sets that Python's core library provides codecs for, with the ability to register custom codecs.
tiktoken is a fast BPE tokenizer that converts text into token sequences compatible with OpenAI models, supporting multiple encoding schemes including o200k_base and model-specific encodings.
Install it if you work with OpenAI APIs or need to understand token boundaries in GPT-family models.
Detects character encoding and language in byte sequences with high accuracy, supporting 99 encodings and returning confidence scores, language tags, and MIME types.
Install it if you need to detect character encoding or language in byte data; the rewrite makes it substantially faster and more accurate than its predecessors.
Converts Unicode text to ASCII by transliterating non-ASCII characters into their closest ASCII equivalents, with no runtime dependencies.
However, if transliteration quality or ongoing maintenance matters, consider unidecode instead despite its GPL-only license.
Lark is a parsing library that builds abstract syntax trees from context-free grammars, supporting multiple parsing algorithms (Earley, LALR(1), CYK) with automatic line and column tracking.
Python bindings to the tree-sitter parsing library, enabling incremental parsing and syntax tree analysis for source code.
See also tree-sitter-python · trailmark · tree-sitter-swift · tree-sitter-java · tree-sitter-go · tree-sitter-kotlin · tree-sitter-ruby · tree-sitter-typescript · tree-sitter-css · spanishconjugator