Function resolveAnchoredStart

packages/cli/src/transform.ts:1383–1419

(renderedText: string, oldSubstring: string, textAnchor: TextEditAnchor)

}

function resolveAnchoredStart(renderedText: string, oldSubstring: string, textAnchor: TextEditAnchor): number | null {
  const oldLength = textAnchor.end - textAnchor.start;
  if (anchorMatchesAt(renderedText, textAnchor.start, oldSubstring, textAnchor)) {
    return textAnchor.start;
  }

  const maxStart = renderedText.length - oldLength;
  const candidates: number[] = [];
  for (let start = 0; start <= maxStart; start++) {
    if (anchorMatchesAt(renderedText, start, oldSubstring, textAnchor)) {
      candidates.push(start);
    }
  }

  if (candidates.length === 0) {
    if (!oldSubstring && textAnchor.start >= 0 && textAnchor.start <= renderedText.length) {
      return textAnchor.start;
    }
    if (
      oldSubstring &&
      textAnchor.start >= 0 &&
      textAnchor.start + oldLength <= renderedText.length &&
      renderedText.slice(textAnchor.start, textAnchor.start + oldLength) === oldSubstring
    ) {
      return textAnchor.start;
    }
    return null;
  }

  if (candidates.length === 1) return candidates[0];

  return candidates.reduce((best, candidate) => {
    const bestDistance = Math.abs(best - textAnchor.start);
    const candidateDistance = Math.abs(candidate - textAnchor.start);
    return candidateDistance < bestDistance ? candidate : best;
  });
}

function replaceWithinSingleSegmentAtOffset(
  node: any,