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author | Dimitri Staessens <[email protected]> | 2019-10-06 21:37:45 +0200 |
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committer | Dimitri Staessens <[email protected]> | 2019-10-06 21:37:45 +0200 |
commit | 3c51c3be85bb0d1bdb87ea0d6632f1c256912f27 (patch) | |
tree | c7ccc8279b12c4f7bdbbb4270d617e48f51722e4 /node_modules/source-map/lib/array-set.js | |
parent | 412c104bebc507bea9c94fd53b5bdc4b64cbfe31 (diff) | |
download | website-3c51c3be85bb0d1bdb87ea0d6632f1c256912f27.tar.gz website-3c51c3be85bb0d1bdb87ea0d6632f1c256912f27.zip |
build: Add some required modules for node
Diffstat (limited to 'node_modules/source-map/lib/array-set.js')
-rw-r--r-- | node_modules/source-map/lib/array-set.js | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/node_modules/source-map/lib/array-set.js b/node_modules/source-map/lib/array-set.js new file mode 100644 index 0000000..fbd5c81 --- /dev/null +++ b/node_modules/source-map/lib/array-set.js @@ -0,0 +1,121 @@ +/* -*- 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'); +var has = Object.prototype.hasOwnProperty; +var hasNativeMap = typeof Map !== "undefined"; + +/** + * 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 = hasNativeMap ? new Map() : Object.create(null); +} + +/** + * 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 hasNativeMap ? this._set.size : 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 = hasNativeMap ? aStr : util.toSetString(aStr); + var isDuplicate = hasNativeMap ? this.has(aStr) : has.call(this._set, sStr); + var idx = this._array.length; + if (!isDuplicate || aAllowDuplicates) { + this._array.push(aStr); + } + if (!isDuplicate) { + if (hasNativeMap) { + this._set.set(aStr, idx); + } else { + this._set[sStr] = idx; + } + } +}; + +/** + * Is the given string a member of this set? + * + * @param String aStr + */ +ArraySet.prototype.has = function ArraySet_has(aStr) { + if (hasNativeMap) { + return this._set.has(aStr); + } else { + var sStr = util.toSetString(aStr); + return has.call(this._set, sStr); + } +}; + +/** + * What is the index of the given string in the array? + * + * @param String aStr + */ +ArraySet.prototype.indexOf = function ArraySet_indexOf(aStr) { + if (hasNativeMap) { + var idx = this._set.get(aStr); + if (idx >= 0) { + return idx; + } + } else { + var sStr = util.toSetString(aStr); + if (has.call(this._set, 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; |