HasteContext 0.2.4

Parser-backed code-context compression using Tree-sitter

HasteContext

Parser-backed code-context compression for Python using Tree-sitter. It builds a structured index of functions/classes, ranks relevant functions for a free-form query with lexical BM25 (optionally fused with semantic embeddings), expands along the call graph, then assembles a compact, LLM-ready payload. A minimal CLI is included for single-file workflows; the library API supports repository-level indexing and hybrid selection.

PyPI Project Page

Import name is haste for API compatibility.

What's New in 0.2.4

• Complete ASCII encoding cleanup for PyPI documentation
• Enhanced documentation formatting and compatibility
• Final encoding artifacts resolution

Key features

• Hybrid retrieval: BM25 over rich function docs; optional semantic fusion
• Strict top-k seed selection, BFS expansion over callers/callees
• Identifier TF-IDF, PageRank on call graph, structure/complexity features
• CAST chunking: byte-safe, newline-aligned split/merge with token caps
• JSON payload with selected functions/classes and optional code blob

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Installation

From PyPI (Recommended)

pip install HasteContext==0.2.4

Visit the package on PyPI: https://pypi.org/project/HasteContext/0.2.4/

Using Poetry

poetry add HasteContext

Development Installation

git clone https://github.com/Hacxmr/AST-Relevance-Compression.git
cd AST-Relevance-Compression
python -m venv .venv
.\.venv\Scripts\activate  # Windows
pip install -e .

Python 3.11+ is required. Core runtime dependencies include:

• tree-sitter
• tree-sitter-language-pack
• tiktoken
• numpy
• rank-bm25
• openai
• sentence-transformers

Optional: set your OpenAI API key when using semantic reranking or embeddings-backed flows.

# Windows Command Prompt
set OPENAI_API_KEY=your_key_here

# Windows PowerShell
$env:OPENAI_API_KEY = "your_key_here"

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Quickstart (programmatic)

Use the single-import public API facade for end-to-end flows:

from haste import select_from_file, build_payload_from_repo

# Single file, mirrors CLI output structure (nodes/classes/selected/code)
out = select_from_file(
    "path/to/file.py",
    query="find dataloader and training loop",
    top_k=6,
    bfs_depth=1,
)
print(out["nodes"][:2])
print(out["code"][:500])

# Repository-level payload (index the tree and select relevant code)
payload = build_payload_from_repo(
    "path/to/repo",
    include_code=True,
    top_k=50,
    depth=1,
    query="http handler metrics",
)

This reduces import boilerplate and keeps a stable, public surface.

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CLI (single Python file)

The minimal CLI operates on a single .py file and prints JSON.

hastecontext path\to\file.py --query "find dataloader and training loop" \
  --top-k 6 --prefilter 300 --bfs-depth 1 --max-add 12 \
  --hard-cap 1200 --soft-cap 1800 [--semantic] [--sem-model text-embedding-3-small]

Flags:

• --query (required): free-form text
• --top-k: seed size (default 6)
• --prefilter: lexical candidate pool before rerank (default 300)
• --bfs-depth: expansion hops over same-module call edges (default 1)
• --max-add: cap on nodes added by BFS (default 12)
• --semantic: enable OpenAI embeddings rerank (requires OPENAI_API_KEY)
• --sem-model: embeddings model (default text-embedding-3-small)
• --hard-cap, --soft-cap: CAST token caps used during chunk split/merge

Example output shape:

{
  "summary": {"total_functions": 12, "total_classes": 3},
  "nodes": [ {"type": "function", "name": "train", "qname": "module::train", "path": "...", "lineno": 10, "end_lineno": 120, "signature": "train(cfg)", "docstring": "...", "score": 0.71} ],
  "classes": [ {"type": "class", "name": "DataLoader", "qname": "module::DataLoader", "path": "..."} ],
  "selected": {"roots": ["module::train"], "functions": ["module::train", "module::step"], "classes": ["module::DataLoader"]},
  "code": "...stitched code under token caps..."
}

Also runnable from source without installing the script:

python -m haste.cli path\to\file.py --query "..."

You can also use the installed console script:

hastecontext path\to\file.py --query "..."

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Advanced usage (lower-level building blocks)

If you need full control, the lower-level modules remain available (indexing, metrics, selection, assembly). See haste.index, haste.metrics, and haste.selection for granular APIs.

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How it works

1. Index with Tree-sitter: collect functions/classes, call edges, decorators, docstrings, variables, and module API hints
2. Score: compute PageRank on the call graph; TF-IDF over identifiers; cyclomatic complexity and structure richness
3. Retrieve: BM25 over rich function docs; optionally fuse semantic rankings via embeddings + RRF
4. Select: enforce strict top-k seeds; expand via BFS over callers/callees; re-rank by fused score
5. Compress: CAST split/merge spans with hard/soft token caps; stitch to a contiguous code blob

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Requirements & Compatibility

• Python 3.11, 3.12, 3.13
• Tree-sitter runtime and tree-sitter-language-pack for Python
• OpenAI API key only needed for --semantic or when using OpenAIEmbedder
• All major operating systems supported (Windows, macOS, Linux)
• This package does not include pipeline.py, reports/, and test scripts, which are used only for internal metrics.

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Contributing

PRs welcome. Use Poetry for the dev environment (poetry install). Run linters/formatters as you normally would; keep public API changes minimal and documented.

License

MIT. See LICENSE file in the repository root.

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Authors: Saish, Mitali Raj, Mushtaq