Function looksLikeCpp

src/extraction/grammars.ts:303–306

* Heuristic: does a .h file contain C++ constructs? * Checks the first ~8KB for patterns that are unique to C++ and never valid C.

(source: string)

 * Checks the first ~8KB for patterns that are unique to C++ and never valid C.
 */
function looksLikeCpp(source: string): boolean {
  const sample = source.substring(0, 8192);
  return /\bnamespace\b|\bclass\s+\w+\s*[:{]|\btemplate\s*<|\b(?:public|private|protected)\s*:|\bvirtual\b|\busing\s+(?:namespace\b|\w+\s*=)/.test(sample);
}

/**
 * Heuristic: does a .h file contain Objective-C constructs?