function replaceRanges()

in scripts/utils/convert-jsr-readme.cjs [25:54]

• 28 lines of code
• 7 McCabe index (conditional complexity)

function replaceRanges(code, replacer) {
  const replacements = [];
  replacer({ replace: (range, replacement) => replacements.push({ range, replacement }) });

  if (!replacements.length) return code;
  replacements.sort((a, b) => a.range[0] - b.range[0]);
  const overlapIndex = replacements.findIndex(
    (r, index) => index > 0 && replacements[index - 1].range[1] > r.range[0],
  );
  if (overlapIndex >= 0) {
    throw new Error(
      `replacements overlap: ${JSON.stringify(replacements[overlapIndex - 1])} and ${JSON.stringify(
        replacements[overlapIndex],
      )}`,
    );
  }

  const parts = [];
  let end = 0;
  for (const {
    range: [from, to],
    replacement,
  } of replacements) {
    if (from > end) parts.push(code.substring(end, from));
    parts.push(replacement);
    end = to;
  }
  if (end < code.length) parts.push(code.substring(end));
  return parts.join('');
}