Class BasicSourceMapConsumer

lib/source-map-consumer.js:173–676

* A BasicSourceMapConsumer instance represents a parsed source map which we can * query for information about the original file positions by giving it a file * position in the generated source. * * The first parameter is the raw source map (either as a JSON string, or * already parsed to an obj

 * [0]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit?pli=1#
 */
class BasicSourceMapConsumer extends SourceMapConsumer {
  constructor(aSourceMap, aSourceMapURL) {
    return super(INTERNAL).then(that => {
      let sourceMap = aSourceMap;
      if (typeof aSourceMap === "string") {
        sourceMap = util.parseSourceMapInput(aSourceMap);
      }

      const version = util.getArg(sourceMap, "version");
      const sources = util.getArg(sourceMap, "sources").map(String);
      // Sass 3.3 leaves out the 'names' array, so we deviate from the spec (which
      // requires the array) to play nice here.
      const names = util.getArg(sourceMap, "names", []);
      const sourceRoot = util.getArg(sourceMap, "sourceRoot", null);
      const sourcesContent = util.getArg(sourceMap, "sourcesContent", null);
      const mappings = util.getArg(sourceMap, "mappings");
      const file = util.getArg(sourceMap, "file", null);
      const x_google_ignoreList = util.getArg(
        sourceMap,
        "x_google_ignoreList",
        null
      );

      // Once again, Sass deviates from the spec and supplies the version as a
      // string rather than a number, so we use loose equality checking here.
      if (version != that._version) {
        throw new Error("Unsupported version: " + version);
      }

      that._sourceLookupCache = new Map();

      // Pass `true` below to allow duplicate names and sources. While source maps
      // are intended to be compressed and deduplicated, the TypeScript compiler
      // sometimes generates source maps with duplicates in them. See Github issue
      // #72 and bugzil.la/889492.
      that._names = ArraySet.fromArray(names.map(String), true);
      that._sources = ArraySet.fromArray(sources, true);

      that._absoluteSources = ArraySet.fromArray(
        that._sources.toArray().map(function (s) {
          return util.computeSourceURL(sourceRoot, s, aSourceMapURL);
        }),
        true
      );

      that.sourceRoot = sourceRoot;
      that.sourcesContent = sourcesContent;
      that._mappings = mappings;
      that._sourceMapURL = aSourceMapURL;
      that.file = file;
      that.x_google_ignoreList = x_google_ignoreList;

      that._computedColumnSpans = false;
      that._mappingsPtr = 0;
      that._wasm = null;

      return wasm().then(w => {
        that._wasm = w;