Class SourceMap

lib/internal/source_map/source_map.js:126–317

* @class * Implements Source Map V3 model. * See https://github.com/google/closure-compiler/wiki/Source-Maps * for format description.

 * for format description.
 */
class SourceMap {
  #payload;
  #mappings = [];
  #sources = {};
  #sourceContentByURL = {};
  #lineLengths = undefined;

  /**
   * @param {SourceMapV3} payload
   */
  constructor(payload, { lineLengths } = { __proto__: null }) {
    if (!base64Map) {
      const base64Digits =
             'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
      base64Map = {};
      for (let i = 0; i < base64Digits.length; ++i)
        base64Map[base64Digits[i]] = i;
    }
    this.#payload = cloneSourceMapV3(payload);
    this.#parseMappingPayload();
    if (ArrayIsArray(lineLengths) && lineLengths.length) {
      this.#lineLengths = lineLengths;
    }
  }

  /**
   * @returns {object} raw source map v3 payload.
   */
  get payload() {
    return cloneSourceMapV3(this.#payload);
  }

  get [kMappings]() {
    return this.#mappings;
  }

  /**
   * @returns {number[] | undefined} line lengths of generated source code
   */
  get lineLengths() {
    if (this.#lineLengths) {
      return ArrayPrototypeSlice(this.#lineLengths);
    }
    return undefined;
  }

  #parseMappingPayload = () => {
    if (this.#payload.sections) {
      this.#parseSections(this.#payload.sections);
    } else {
      this.#parseMap(this.#payload, 0, 0);
    }
    ArrayPrototypeSort(this.#mappings, compareSourceMapEntry);
  };

  /**
   * @param {Array.<SourceMapV3.Section>} sections
   */