Function diagnoseGrammar

src/tools/ast/parser.ts:125–164

(
  language: string,
)

 * degrading to the regex fallback.
 */
export async function diagnoseGrammar(
  language: string,
): Promise<{ ok: boolean; path?: string; error?: string }> {
  try {
    await initTreeSitter();
  } catch (e: any) {
    return { ok: false, error: e?.message ?? 'tree-sitter init failed' };
  }
  const grammarFile = `tree-sitter-${language}.wasm`;
  const candidates: string[] = [];
  try {
    const here = path.dirname(url.fileURLToPath(import.meta.url));
    candidates.push(path.join(here, '..', '..', '..', 'grammars', grammarFile));
    candidates.push(path.join(here, '..', '..', '..', '..', 'grammars', grammarFile));
    candidates.push(path.join(process.cwd(), 'grammars', grammarFile));
  } catch {}

  let lastError: string | undefined;
  let foundButUnloadable = false;
  for (const candidate of candidates) {
    try {
      await access(candidate);
    } catch {
      continue; // file not present at this candidate
    }
    foundButUnloadable = true;
    try {
      await TSLanguage.load(candidate);
      return { ok: true, path: candidate };
    } catch (e: any) {
      lastError = e?.message ?? String(e);
    }
  }
  return {
    ok: false,
    error: foundButUnloadable
      ? (lastError ?? 'grammar present but load failed')
      : 'no grammar file found in any candidate path',
  };
}

export interface FoundSymbol {
  name: string;