tree-sitter-gdl 0.2.0

GDL/IDL grammar for tree-sitter

tree-sitter-gdl

GDL/IDL grammar for tree-sitter.

Parses .pro files written in GDL (GNU Data Language) / IDL (Interactive Data Language), used extensively in fusion research, astronomy, and earth science.

Installation

Python

uv add tree-sitter-gdl

Or with pip:

pip install tree-sitter-gdl

Usage

import tree_sitter_gdl
from tree_sitter import Parser

parser = Parser(tree_sitter_gdl.language())

code = b"""
pro analyze_data, shot, verbose=verbose
  mds$open, 'experiment', shot
  signal = mds$value('\\diagnostics::channel_01')
  if n_elements(signal) gt 0 then begin
    result = total(signal) / n_elements(signal)
  endif
  mds$close
end
"""

tree = parser.parse(code)
print(tree.root_node.type)  # "source_file"

Node.js

npm install tree-sitter-gdl

const Parser = require("tree-sitter");
const GDL = require("tree-sitter-gdl");

const parser = new Parser();
parser.setLanguage(GDL);

const tree = parser.parse("pro hello\n  print, 'world'\nend");

Supported Syntax

Feature	Status
Procedures (pro...end)	✅
Functions (function...end)	✅
If/then/else (inline and block)	✅
For/foreach/while/repeat loops	✅
Case/switch statements	✅
Function/procedure calls	✅
Keyword arguments (name=value, /flag)	✅
Array subscripting (arr[i], arr[0:10:2])	✅
Structures ({tag: value})	✅
Member access (struct.member)	✅
Object methods (obj->method())	✅
Word operators (eq, ne, lt, gt, and, or)	✅
System variables (!pi, !error_state)	✅
Line continuation ($)	✅
Comments (;)	✅
Ternary (cond ? a : b)	✅
Matrix operators (#, ##)	✅
Common blocks	✅
Goto/labels	✅
Batch include (@file)	✅
MDSplus calls (mds$open, mds$value)	✅

Development

Prerequisites

• Node.js 20+
• tree-sitter CLI (npm install tree-sitter-cli@0.24.7)
• Python 3.10+ (for Python bindings)
• C compiler (gcc, clang, or MSVC)

Build

# Generate parser from grammar
npx tree-sitter generate

# Run corpus tests
npx tree-sitter test

# Build and install Python bindings (editable)
uv pip install -e .

# Run Python tests
uv run pytest tests/ -v

Testing

# Run all tree-sitter corpus tests
npx tree-sitter test

# Parse a file
npx tree-sitter parse example.pro

# Run Python tests
uv run pytest tests/ -v

Versioning

Versions are derived automatically from git tags using setuptools-scm. To release a new version:

# Tag on your fork
git tag v0.1.0
git push origin v0.1.0

# Push tag to upstream to trigger the release workflow
git push upstream v0.1.0

The release workflow builds wheels via cibuildwheel and publishes to PyPI using trusted publishing (OIDC).

License

MIT