Function lineLengths

lib/internal/source_map/source_map_cache.js:260–278

(content)

// from. This allows translation from byte offset V8 coverage reports,
// to line/column offset Source Map V3.
function lineLengths(content) {
  const contentLength = content.length;
  const output = [];
  let lineLength = 0;
  for (let i = 0; i < contentLength; i++, lineLength++) {
    const codePoint = StringPrototypeCodePointAt(content, i);

    // We purposefully keep \r as part of the line-length calculation, in
    // cases where there is a \r\n separator, so that this can be taken into
    // account in coverage calculations.
    // codepoints for \n (new line), \u2028 (line separator) and \u2029 (paragraph separator)
    if (codePoint === 10 || codePoint === 0x2028 || codePoint === 0x2029) {
      ArrayPrototypePush(output, lineLength);
      lineLength = -1; // To not count the matched codePoint such as \n character
    }
  }
  ArrayPrototypePush(output, lineLength);
  return output;
}

/**
 * Read source map from file.