Function areSimilar

scripts/sparc2/src/diff/diffTracker.ts:244–257

* Check if two strings are similar (used for detecting changed lines) * @param a First string * @param b Second string * @returns True if the strings are similar

(a: string, b: string)

 * @returns True if the strings are similar
 */
function areSimilar(a: string, b: string): boolean {
  // Simple similarity check: more than 60% of characters are the same
  const maxLength = Math.max(a.length, b.length);
  if (maxLength === 0) return true;

  let sameChars = 0;
  const minLength = Math.min(a.length, b.length);

  for (let i = 0; i < minLength; i++) {
    if (a[i] === b[i]) sameChars++;
  }

  return sameChars / maxLength > 0.6;
}

/**
 * Compute a diff between two files, focusing on function-level changes