tree-sitter-clean

Clean grammar for tree-sitter.

Description

Clean is a general-purpose, purely functional programming language with uniqueness typing. This grammar supports:

• Module system (module, import, from...import)
• Type system (::, algebraic data types, records, type classes)
• Functions (named, guards, where/with clauses)
• Patterns (variables, constructors, wildcards, lists, tuples)
• Expressions (application, infix operators, let, case, lambda)
• Comprehensions (list comprehensions with generators, guards, let qualifiers)
• Records (construction, update, field access)

Coverage

The grammar is validated against the real-world Clean corpus (clean-stdlib, Clyde, cloogle.org — 120 .icl + 119 .dcl files):

• 1833 ERROR nodes across the .icl corpus vs 5129 before the grammar overhaul (2.8× better), with the core stdlib (StdEnv, StdList, StdString, StdMaybe) at 0 errors
• 13 ERROR nodes across the .dcl corpus (down from 282)
• 55/55 corpus tests, parse throughput ~1.3× the pre-overhaul parser

Known Gaps

Clean constructs the grammar does not (fully) parse yet are documented in GRAMMAR-GAPS.md, along with the approaches that were tried and rejected on the full corpus. Remaining gaps are confined to regions the reference parser also fails heavily; closing them is blocked by a tree-sitter generator action-table ceiling (see the doc).

Node Types

The grammar produces 189 named node types for precise AST analysis, including:

• application — function/constructor call detection
• field_access — record field access
• list_comprehension — with generator, guard, let_qualifier
• record_expression / record_update — record manipulation
• wildcard — _ pattern
• type_definition / type_signature / class_context — the type system

Usage

Rust

let mut parser = tree_sitter::Parser::new();
parser.set_language(&tree_sitter_clean::LANGUAGE.into())?;

Add tree-sitter-clean to your Cargo.toml to use it as a dependency:

[dependencies]
tree-sitter-clean = "1.2"

JavaScript

const Parser = require("tree-sitter");
const Clean = require("tree-sitter-clean");
const parser = new Parser();
parser.setLanguage(Clean);

Python

import tree_sitter_clean

References

• Clean Language Report
• Clean Book