1 files changed, 104 insertions, 0 deletions
diff --git a/deps/npm/node_modules/readable-stream/node_modules/unreachable-branch-transform/node_modules/recast/node_modules/source-map/lib/array-set.js b/deps/npm/node_modules/readable-stream/node_modules/unreachable-branch-transform/node_modules/recast/node_modules/source-map/lib/array-set.js
new file mode 100644
index 0000000000..0ffbb9fd98
--- /dev/null
+++ b/deps/npm/node_modules/readable-stream/node_modules/unreachable-branch-transform/node_modules/recast/node_modules/source-map/lib/array-set.js
@@ -0,0 +1,104 @@
+/* -*- Mode: js; js-indent-level: 2; -*- */
+/*
+ * Copyright 2011 Mozilla Foundation and contributors
+ * Licensed under the New BSD license. See LICENSE or:
+ * http://opensource.org/licenses/BSD-3-Clause
+ */
+{
+  var util = require('./util');
+
+  /**
+   * A data structure which is a combination of an array and a set. Adding a new
+   * member is O(1), testing for membership is O(1), and finding the index of an
+   * element is O(1). Removing elements from the set is not supported. Only
+   * strings are supported for membership.
+   */
+  function ArraySet() {
+    this._array = [];
+    this._set = {};
+  }
+
+  /**
+   * Static method for creating ArraySet instances from an existing array.
+   */
+  ArraySet.fromArray = function ArraySet_fromArray(aArray, aAllowDuplicates) {
+    var set = new ArraySet();
+    for (var i = 0, len = aArray.length; i < len; i++) {
+      set.add(aArray[i], aAllowDuplicates);
+    }
+    return set;
+  };
+
+  /**
+   * Return how many unique items are in this ArraySet. If duplicates have been
+   * added, than those do not count towards the size.
+   *
+   * @returns Number
+   */
+  ArraySet.prototype.size = function ArraySet_size() {
+    return Object.getOwnPropertyNames(this._set).length;
+  };
+
+  /**
+   * Add the given string to this set.
+   *
+   * @param String aStr
+   */
+  ArraySet.prototype.add = function ArraySet_add(aStr, aAllowDuplicates) {
+    var sStr = util.toSetString(aStr);
+    var isDuplicate = this._set.hasOwnProperty(sStr);
+    var idx = this._array.length;
+    if (!isDuplicate || aAllowDuplicates) {
+      this._array.push(aStr);
+    }
+    if (!isDuplicate) {
+      this._set[sStr] = idx;
+    }
+  };
+
+  /**
+   * Is the given string a member of this set?
+   *
+   * @param String aStr
+   */
+  ArraySet.prototype.has = function ArraySet_has(aStr) {
+    var sStr = util.toSetString(aStr);
+    return this._set.hasOwnProperty(sStr);
+  };
+
+  /**
+   * What is the index of the given string in the array?
+   *
+   * @param String aStr
+   */
+  ArraySet.prototype.indexOf = function ArraySet_indexOf(aStr) {
+    var sStr = util.toSetString(aStr);
+    if (this._set.hasOwnProperty(sStr)) {
+      return this._set[sStr];
+    }
+    throw new Error('"' + aStr + '" is not in the set.');
+  };
+
+  /**
+   * What is the element at the given index?
+   *
+   * @param Number aIdx
+   */
+  ArraySet.prototype.at = function ArraySet_at(aIdx) {
+    if (aIdx >= 0 && aIdx < this._array.length) {
+      return this._array[aIdx];
+    }
+    throw new Error('No element indexed by ' + aIdx);
+  };
+
+  /**
+   * Returns the array representation of this set (which has the proper indices
+   * indicated by indexOf). Note that this is a copy of the internal array used
+   * for storing the members so that no one can mess with internal state.
+   */
+  ArraySet.prototype.toArray = function ArraySet_toArray() {
+    return this._array.slice();
+  };
+
+  exports.ArraySet = ArraySet;
+}