lang-parsing-substrate

A shared language-parsing substrate for static-analysis tools: tree-sitter grammar dispatch, language detection, and a growing set of language-agnostic analysis primitives (import/call graphs, control-flow graphs, structural fingerprinting, suppression comments) built on top of a unified LanguageInfo registry across 16 languages — compiled in at build time via Cargo feature flags.

What's in the substrate

Module	Provides
`registry`	Language detection by extension, the `LanguageInfo` table, SLOC comment-style metadata
`query`	Iterative (non-recursive) tree-sitter traversal helpers: `find_descendants`, `find_first_descendant`, `node_text`, ancestor lookups
`imports`	Per-file import/use-statement extraction, for building efferent-coupling (Ce) edges
`calls`	Per-file call-graph edge extraction (`caller` → `callee`), with external-call detection
`cfg`	Control-flow graph / basic-block construction for a function body (`c`, `cpp`, `rust`)
`c_standard`	Best-effort lower bound on the C standard (C99/C11/C23) a file's syntax requires
`fingerprint`	Structural hashing of function-like subtrees, for duplicate/clone detection across a corpus
`regions`	`tools:off` / `tools:on` ignored-region markers
`suppressions`	`tools:suppress TOOL:RULE` single-line suppression comments
`path_ignore`	Compiled glob ignore-pattern sets for path filtering

Everything below the registry is deliberately per-file: a module extracts what one parse tree contains, and leaves assembling a corpus-wide graph, dedup report, or coupling metric to the caller. This keeps the substrate's job narrow (one authoritative, correct answer per file) and lets each consumer choose its own storage model (in-memory, SQLite, whatever) without the substrate needing to know about it.

Language coverage varies by module — the registry knows about all 16 languages, but modules like cfg only model the languages they've been built out for. A module never fabricates a result for a language it doesn't support; it returns None (or an empty result) instead of guessing.

Feature flags

Not every consumer needs all 16 languages. Each language is an optional Cargo feature; the all-languages convenience feature (enabled by default) pulls in the full set.

Feature	Language	Grammar crate
`lang-c`	C	`tree-sitter-c`
`lang-cpp`	C++	`tree-sitter-cpp`
`lang-rust`	Rust	`tree-sitter-rust`
`lang-python`	Python	`tree-sitter-python`
`lang-javascript`	JavaScript	`tree-sitter-javascript`
`lang-typescript`	TypeScript	`tree-sitter-typescript`
`lang-go`	Go	`tree-sitter-go`
`lang-java`	Java	`tree-sitter-java`
`lang-csharp`	C#	`tree-sitter-c-sharp`
`lang-kotlin`	Kotlin	`tree-sitter-kotlin-ng`
`lang-swift`	Swift	`tree-sitter-swift`
`lang-php`	PHP	`tree-sitter-php`
`lang-ada`	Ada	`tree-sitter-ada`
`lang-fortran`	Fortran (free-form)	`tree-sitter-fortran`
`lang-scala`	Scala	`tree-sitter-scala`
`lang-lua`	Lua	`tree-sitter-lua`
`all-languages`	All of the above	—

A consumer that only cares about C/C++, for example, would declare:

lang-parsing-substrate = { version = "0.5", default-features = false, features = ["lang-c", "lang-cpp"] }

Usage

# Cargo.toml — full language set (default)
lang-parsing-substrate = "0.5"

# Cargo.toml — C/C++ only
lang-parsing-substrate = { version = "0.5", default-features = false, features = ["lang-c", "lang-cpp"] }

use lang_parsing_substrate::{language_for_file, languages, supported_languages_report};
use std::path::Path;

// Detect language for a file
if let Some(lang) = language_for_file(Path::new("main.c")) {
    let mut parser = tree_sitter::Parser::new();
    parser.set_language(&lang).unwrap();
    // parse...
}

// Enumerate compiled-in languages (reflects feature flags)
for info in languages() {
    println!("{}: {:?}", info.name, info.extensions);
}

// Human-readable summary (for --supported-languages flags)
print!("{}", supported_languages_report());

Grammar crates are re-exported so consumers reach them transitively:

// No direct tree-sitter-rust dependency needed in your Cargo.toml
use lang_parsing_substrate::tree_sitter_rust;

Analysis primitives

use lang_parsing_substrate::{call_edges, import_sources, build_function_cfg, structural_hash};

// Call-graph edges for every named function/macro in a parsed file
let edges = call_edges(tree.root_node(), source);

// Import/use-statement sources, for Ce/Ca coupling metrics
let imports = import_sources(&tree, source.as_bytes(), "rust");

// Control-flow graph for a single function body (c/cpp/rust)
if let Some(cfg) = build_function_cfg(func_node, source, "rust") {
    println!("{} basic blocks", cfg.block_count());
}

// Best-effort lower bound on the C standard a file requires
if let Some(standard) = detect_min_c_standard(&tree, source.as_bytes()) {
    println!("requires at least {standard:?}");
}

API

languages() -> &'static [LanguageInfo] — compiled-in language set
language_for_file(path: &Path) -> Option<Language> — grammar dispatch by extension
language_for_key(key: &str) -> Option<Language> — grammar dispatch by registry key
language_info_for_file(path: &Path) -> Option<&'static LanguageInfo>
is_source_extension / is_parseable_extension(ext: &OsStr) -> bool — recursive-discovery gates
supported_languages_report() -> String — human-readable language summary
LanguageInfo / SlocMode — registry metadata and comment-style enum (drives SLOC calculation)
find_descendants / find_first_descendant / find_ancestor / node_text and friends — traversal helpers (query)
import_sources / distinct_import_count — import extraction (imports)
call_edges / CallEdge / is_function_kind / get_function_name — call-graph extraction (calls)
build_function_cfg / FunctionCfg / BasicBlock / CfgEdge — control-flow graphs (cfg)
detect_min_c_standard / CStandard — C standard lower-bound detection (c_standard)
function_fingerprints / duplicate_groups / Fingerprint / CorpusFingerprint — structural hashing (fingerprint)
ignored_regions / IgnoredRegion — tools:off/tools:on markers (regions)
suppressions / Suppression — tools:suppress comments (suppressions)
PathIgnore — compiled glob ignore sets (path_ignore)

Building

cargo build                                          # all languages (default)
cargo build --no-default-features --features lang-c,lang-cpp  # subset
cargo test

Requires no C compiler — tree-sitter grammar crates ship pre-generated C sources and compile via the cc crate.

Python bindings

The pyo3 Cargo feature (off by default) exposes the substrate's language-agnostic analysis primitives as a Python extension module, published to PyPI as prebuilt abi3 wheels (CPython 3.10+, one wheel per platform — see docs/releasing.md):

pip install lang-parsing-substrate

Building it yourself from source uses maturin:

pip install maturin
maturin build --release          # writes target/wheels/lang_parsing_substrate-*.whl
pip install target/wheels/lang_parsing_substrate-*.whl

import lang_parsing_substrate as lps

src = "fn helper(x: i32) -> i32 { x + 1 }\nfn main() { helper(41); }\n"
edges = lps.call_edges("rust", src)          # [CallEdge(caller='main', callee='helper', ...)]
cfg = lps.function_cfg("rust", src, "main")  # FunctionCfg | None
fps = lps.function_fingerprints("rust", src, min_nodes=1)

Python can't hand this crate a tree_sitter::Node/Tree directly — this crate's tree-sitter version has no ABI relationship to tree-sitter's own, separate Python bindings — so every bound function takes (language_key, source), parses internally, and returns owned data (CallEdge, FunctionCfg, Fingerprint, Suppression, IgnoredRegion, LanguageInfo, all plain attribute-holding classes). A consumer that also needs to walk the tree itself (e.g. for domain-specific semantics this crate doesn't model) still parses separately with a language-specific tree-sitter Python package; the bindings here only cover the substrate's own primitives.

invoke build-wheel builds the wheel locally for testing. The actual PyPI release happens in CI on a vX.Y.Z tag push, via Trusted Publishing (OIDC, no API token) — see docs/releasing.md.

License

MIT — see LICENSE.

Development Status
- 4 - Beta
Intended Audience
- Developers
License
- OSI Approved :: MIT License
Programming Language
- Python :: 3
- Rust
Topic
- Software Development :: Quality Assurance

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Source repository:
- Permalink: brandon-arrendondo/lang_parsing_substrate@ae7a0b64a08b97e5a6ac226775d15118cc768401
- Branch / Tag: refs/tags/v0.5.2
- Owner: https://github.com/brandon-arrendondo
- Access: public
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- Runner Environment: github-hosted
- Publication workflow: wheels.yml@ae7a0b64a08b97e5a6ac226775d15118cc768401
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Download URL: lang_parsing_substrate-0.5.2-cp310-abi3-macosx_10_12_x86_64.whl
Upload date: Aug 25, 2026
Size: 3.4 MB
Tags: CPython 3.10+, macOS 10.12+ x86-64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/7.0.0 CPython/3.13.14

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The following attestation bundles were made for lang_parsing_substrate-0.5.2-cp310-abi3-macosx_10_12_x86_64.whl:

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Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: lang_parsing_substrate-0.5.2-cp310-abi3-macosx_10_12_x86_64.whl
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- Branch / Tag: refs/tags/v0.5.2
- Owner: https://github.com/brandon-arrendondo
- Access: public
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- Runner Environment: github-hosted
- Publication workflow: wheels.yml@ae7a0b64a08b97e5a6ac226775d15118cc768401
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Sep 14, 2026 8 files

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This release

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0.5.1

Aug 18, 2026 8 files

lang-parsing-substrate 0.5.2

lang-parsing-substrate

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