Method findEntry

lib/internal/source_map/source_map.js:196–226

* @param {number} lineOffset 0-indexed line offset in compiled resource * @param {number} columnOffset 0-indexed column offset in compiled resource * @returns {object} representing start of range if found, or empty object

(lineOffset, columnOffset)

   * @returns {object} representing start of range if found, or empty object
   */
  findEntry(lineOffset, columnOffset) {
    let first = 0;
    let count = this.#mappings.length;
    while (count > 1) {
      const step = count >> 1;
      const middle = first + step;
      const mapping = this.#mappings[middle];
      if (lineOffset < mapping[0] ||
          (lineOffset === mapping[0] && columnOffset < mapping[1])) {
        count = step;
      } else {
        first = middle;
        count -= step;
      }
    }
    const entry = this.#mappings[first];
    if (!first && entry && (lineOffset < entry[0] ||
        (lineOffset === entry[0] && columnOffset < entry[1]))) {
      return {};
    } else if (!entry) {
      return {};
    }
    return {
      generatedLine: entry[0],
      generatedColumn: entry[1],
      originalSource: entry[2],
      originalLine: entry[3],
      originalColumn: entry[4],
      name: entry[5],
    };
  }

  /**
   * @param {number} lineNumber 1-indexed line number in compiled resource call site