Method #parseMap

lib/internal/source_map/source_map.js:257–316

* @override

(map, lineNumber, columnNumber)

   * @override
   */
  #parseMap(map, lineNumber, columnNumber) {
    let sourceIndex = 0;
    let sourceLineNumber = 0;
    let sourceColumnNumber = 0;
    let nameIndex = 0;

    const sources = [];
    const originalToCanonicalURLMap = {};
    for (let i = 0; i < map.sources.length; ++i) {
      const url = map.sources[i];
      originalToCanonicalURLMap[url] = url;
      ArrayPrototypePush(sources, url);
      this.#sources[url] = true;

      if (map.sourcesContent?.[i])
        this.#sourceContentByURL[url] = map.sourcesContent[i];
    }

    const stringCharIterator = new StringCharIterator(map.mappings);
    let sourceURL = sources[sourceIndex];
    while (true) {
      if (stringCharIterator.peek() === ',')
        stringCharIterator.next();
      else {
        while (stringCharIterator.peek() === ';') {
          lineNumber += 1;
          columnNumber = 0;
          stringCharIterator.next();
        }
        if (!stringCharIterator.hasNext())
          break;
      }

      columnNumber += decodeVLQ(stringCharIterator);
      if (isSeparator(stringCharIterator.peek())) {
        ArrayPrototypePush(this.#mappings, [lineNumber, columnNumber]);
        continue;
      }

      const sourceIndexDelta = decodeVLQ(stringCharIterator);
      if (sourceIndexDelta) {
        sourceIndex += sourceIndexDelta;
        sourceURL = sources[sourceIndex];
      }
      sourceLineNumber += decodeVLQ(stringCharIterator);
      sourceColumnNumber += decodeVLQ(stringCharIterator);

      let name;
      if (!isSeparator(stringCharIterator.peek())) {
        nameIndex += decodeVLQ(stringCharIterator);
        name = map.names?.[nameIndex];
      }

      ArrayPrototypePush(
        this.#mappings,
        [lineNumber, columnNumber, sourceURL, sourceLineNumber,
         sourceColumnNumber, name],
      );