fix(parsing): select the signature grammar by path, like indexing does

[citron07r]

Verified

The premise holds. extract_signature_inner called tree_sitter_grammar(lang), selecting by the Language enum alone, while indexing goes through tree_sitter_grammar_for_path. For a .tsx file the two parsed the same content with different grammars.

Does it actually diverge?

Yes, but not where I first expected, and the honest answer about impact is more limited than the issue assumes.

extract_signature finds the byte offset of the first body node and returns everything before it. JSX lives inside bodies, so the grammars agree on where a body starts. I tried nine realistic samples — components, generic-vs-JSX ambiguity (<T,>), arrow components, default parameters containing JSX, class property initializers, type assertions, fragments — and every one produced an identical signature under both grammars.

The divergence appears when JSX precedes a declaration in the same content. Then the TypeScript grammar fails to locate a body within the depth limit at all, and extract_signature silently falls back to dumping raw lines:

typescript: "const A = <p>{ q }</p>;\nfunction Later(x: number) {\n  return x;\n[... 1 more lines]"
tsx:        "const A = <p>{ q }</p>;\nfunction Later(x: number) { ... }"

I could not reach that through the normal chunking path. The chunker gives each top-level declaration its own chunk, so a chunk's content does not start with JSX ahead of a declaration. Indexing the case above produces four chunks, and the Toolbar chunk begins at the declaration — vera search --compact output is identical before and after this change.

So: a real inconsistency in a public API, with a demonstrable output difference at the function level, but no user-visible symptom I could produce. I would rather say that plainly than dress it up.

Change

extract_signature takes a file_path and routes through tree_sitter_grammar_for_path, the same selection indexing uses. All four call sites already had a path to hand (SearchResult::file_path, Chunk::file_path), so nothing needed plumbing.

The regression test pins both directions: the same content under a .tsx path yields a stripped signature, and under a .ts path keeps the old fallback — which is correct there, since outside a .tsx file the angle brackets really are type syntax. Confirmed the test fails when the grammar selection is reverted.

774 vera-core tests, 97 vera-cli, cargo fmt --check clean, clippy unchanged at the pre-existing warnings.

Fixes #75

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Summary by cubic

Selects the signature grammar by file path to match indexing. Previously grammar came from Language only; .tsx could parse as TypeScript and fall back to raw lines when JSX precedes a declaration. Now .tsx uses the TSX grammar, producing stripped signatures and aligning outputs.

• Adds extract_signature_for_path(content, lang, file_path) and routes vera-core (including retrieval/type_relations), vera-cli, and vera-mcp to it; keeps extract_signature for callers without a path.
• Behavior: function-level output now matches indexing for .tsx; chunked results remain unchanged. Tests add a .tsx vs .ts regression and pin the exact .ts first-three-lines fallback.

^{Written for commit d62119e. Summary will update on new commits.}

Summary by CodeRabbit

• Bug Fixes
  • Improved code signature extraction for files with extensions such as .tsx.
  • Preserved reliable fallback behavior for TypeScript files.
  • Updated result displays and relationship information to use file-specific parsing for more accurate output.

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📒 Files selected for processing (5)

• crates/vera-cli/src/helpers.rs
• crates/vera-core/src/parsing/signatures.rs
• crates/vera-core/src/parsing/type_relations.rs
• crates/vera-core/src/retrieval/type_relations.rs
• crates/vera-mcp/src/tools.rs

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📝 Walkthrough

Walkthrough

Signature extraction now supports tree-sitter grammar selection by language and file path. Callers pass file paths to the new API. Tests cover TSX parsing and .ts fallback behavior.

Changes

Signature extraction

Layer / File(s)	Summary
Path-aware parser and validation crates/vera-core/src/parsing/signatures.rs	The parser adds extract_signature_for_path and selects grammars by file path. Tests cover TSX parsing and .ts fallback behavior.
Caller path propagation crates/vera-cli/src/helpers.rs, crates/vera-core/src/parsing/type_relations.rs, crates/vera-core/src/retrieval/type_relations.rs, crates/vera-mcp/src/tools.rs	Signature-extraction callers now pass each source file path.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🔵 Low · up to d6211

The change aligns signature extraction with file-path grammar selection and may alter retrieved snippets for dialect-sensitive files. It is mergeable with owner awareness, but the repository’s required retrieval benchmark should be run and recorded before merge.

Possibly related PRs

• VeraTools/Vera#58: Both PRs use path-aware grammar selection for TSX signature parsing.

Suggested reviewers: lemon07r

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes verify the TSX divergence and implement path-aware signature extraction across all relevant call sites [#75].
Out of Scope Changes check	✅ Passed	All changes support path-aware signature extraction, regression coverage, or required call-site updates.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: selecting signature grammars by file path to match indexing behavior.

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Actionable comments posted: 1

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Inline comments:
In `@crates/vera-core/src/parsing/signatures.rs`:
- Around line 187-194: Strengthen the `.ts` fallback test around
`extract_signature` by asserting that `ts` exactly equals the documented
`first_n_lines` fallback output, replacing the weaker inequality and substring
checks. Keep the existing TypeScript and TSX setup unchanged.

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📒 Files selected for processing (5)

• crates/vera-cli/src/helpers.rs
• crates/vera-core/src/parsing/signatures.rs
• crates/vera-core/src/parsing/type_relations.rs
• crates/vera-core/src/retrieval/type_relations.rs
• crates/vera-mcp/src/tools.rs

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[citron07r]

Valid, fixed in 111bd6f.

The .ts branch only required the output to differ from the tsx one and to omit "{ ... }". A differently malformed signature would have satisfied both, which makes it a check that the two paths disagree rather than a check that the fallback is correct.

It now asserts the full first_n_lines result:

const A = <p>{ q }</p>;
function Later(x: number) {
  return x;
[... 1 more lines]

That is the documented fallback behaviour, so the test now pins what the .ts path is supposed to produce instead of merely what it is not.

773 vera-core tests pass, cargo fmt --check clean, clippy unchanged at the 5 pre-existing warnings.