Function restoreDirectiveLines

src/extraction/languages/c-cpp.ts:762–778

* Restore preprocessor-directive lines to their original bytes after the * blanking passes ran. The token-level blanks match on shape, not context, so * a macro name that happens to sit inside a DIRECTIVE gets blanked too — and * blanking the name position of `#define FMT_API FMT_VISIBILITY("defa

(original: string, blanked: string)

 * construction and strictly reduces parse errors on both extraction arms.
 */
function restoreDirectiveLines(original: string, blanked: string): string {
  if (blanked === original || original.indexOf('#') === -1) return blanked;
  const o = original.split('\n');
  const b = blanked.split('\n');
  let changed = false;
  let continuation: boolean = false;
  for (let i = 0; i < o.length && i < b.length; i++) {
    const line = o[i] as string;
    const isDirective: boolean = continuation || /^[ \t]*#/.test(line);
    if (isDirective && b[i] !== line) {
      b[i] = line;
      changed = true;
    }
    continuation = isDirective && /\\\s*$/.test(line.replace(/\r$/, ''));
  }
  return changed ? b.join('\n') : blanked;
}

/** C/C++ source pre-processing before tree-sitter: recover macro-annotated class
 * definitions, macro-prefixed function definitions, macro-prefixed members, and