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Viewing file:     mapping-list.js (2.23 KB)      -rw-r--r--

/* -*- Mode: js; js-indent-level: 2; -*- */
/*
 * Copyright 2014 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

const util = require("./util");

/**
 * Determine whether mappingB is after mappingA with respect to generated
 * position.
 */
function generatedPositionAfter(mappingA, mappingB) {
  // Optimized for most common case
  const lineA = mappingA.generatedLine;
  const lineB = mappingB.generatedLine;
  const columnA = mappingA.generatedColumn;
  const columnB = mappingB.generatedColumn;
  return lineB > lineA || lineB == lineA && columnB >= columnA ||
         util.compareByGeneratedPositionsInflated(mappingA, mappingB) <= 0;
}

/**
 * A data structure to provide a sorted view of accumulated mappings in a
 * performance conscious manner. It trades a negligible overhead in general
 * case for a large speedup in case of mappings being added in order.
 */
class MappingList {
  constructor() {
    this._array = [];
    this._sorted = true;
    // Serves as infimum
    this._last = {generatedLine: -1, generatedColumn: 0};
  }

  /**
   * Iterate through internal items. This method takes the same arguments that
   * `Array.prototype.forEach` takes.
   *
   * NOTE: The order of the mappings is NOT guaranteed.
   */
  unsortedForEach(aCallback, aThisArg) {
    this._array.forEach(aCallback, aThisArg);
  }

  /**
   * Add the given source mapping.
   *
   * @param Object aMapping
   */
  add(aMapping) {
    if (generatedPositionAfter(this._last, aMapping)) {
      this._last = aMapping;
      this._array.push(aMapping);
    } else {
      this._sorted = false;
      this._array.push(aMapping);
    }
  }

  /**
   * Returns the flat, sorted array of mappings. The mappings are sorted by
   * generated position.
   *
   * WARNING: This method returns internal data without copying, for
   * performance. The return value must NOT be mutated, and should be treated as
   * an immutable borrow. If you want to take ownership, you must make your own
   * copy.
   */
  toArray() {
    if (!this._sorted) {
      this._array.sort(util.compareByGeneratedPositionsInflated);
      this._sorted = true;
    }
    return this._array;
  }
}

exports.MappingList = MappingList;