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- 'use strict';
- var create = require('../internals/object-create');
- var defineBuiltInAccessor = require('../internals/define-built-in-accessor');
- var defineBuiltIns = require('../internals/define-built-ins');
- var bind = require('../internals/function-bind-context');
- var anInstance = require('../internals/an-instance');
- var isNullOrUndefined = require('../internals/is-null-or-undefined');
- var iterate = require('../internals/iterate');
- var defineIterator = require('../internals/iterator-define');
- var createIterResultObject = require('../internals/create-iter-result-object');
- var setSpecies = require('../internals/set-species');
- var DESCRIPTORS = require('../internals/descriptors');
- var fastKey = require('../internals/internal-metadata').fastKey;
- var InternalStateModule = require('../internals/internal-state');
-
- var setInternalState = InternalStateModule.set;
- var internalStateGetterFor = InternalStateModule.getterFor;
-
- module.exports = {
- getConstructor: function (wrapper, CONSTRUCTOR_NAME, IS_MAP, ADDER) {
- var Constructor = wrapper(function (that, iterable) {
- anInstance(that, Prototype);
- setInternalState(that, {
- type: CONSTRUCTOR_NAME,
- index: create(null),
- first: null,
- last: null,
- size: 0
- });
- if (!DESCRIPTORS) that.size = 0;
- if (!isNullOrUndefined(iterable)) iterate(iterable, that[ADDER], { that: that, AS_ENTRIES: IS_MAP });
- });
-
- var Prototype = Constructor.prototype;
-
- var getInternalState = internalStateGetterFor(CONSTRUCTOR_NAME);
-
- var define = function (that, key, value) {
- var state = getInternalState(that);
- var entry = getEntry(that, key);
- var previous, index;
- // change existing entry
- if (entry) {
- entry.value = value;
- // create new entry
- } else {
- state.last = entry = {
- index: index = fastKey(key, true),
- key: key,
- value: value,
- previous: previous = state.last,
- next: null,
- removed: false
- };
- if (!state.first) state.first = entry;
- if (previous) previous.next = entry;
- if (DESCRIPTORS) state.size++;
- else that.size++;
- // add to index
- if (index !== 'F') state.index[index] = entry;
- } return that;
- };
-
- var getEntry = function (that, key) {
- var state = getInternalState(that);
- // fast case
- var index = fastKey(key);
- var entry;
- if (index !== 'F') return state.index[index];
- // frozen object case
- for (entry = state.first; entry; entry = entry.next) {
- if (entry.key === key) return entry;
- }
- };
-
- defineBuiltIns(Prototype, {
- // `{ Map, Set }.prototype.clear()` methods
- // https://tc39.es/ecma262/#sec-map.prototype.clear
- // https://tc39.es/ecma262/#sec-set.prototype.clear
- clear: function clear() {
- var that = this;
- var state = getInternalState(that);
- var entry = state.first;
- while (entry) {
- entry.removed = true;
- if (entry.previous) entry.previous = entry.previous.next = null;
- entry = entry.next;
- }
- state.first = state.last = null;
- state.index = create(null);
- if (DESCRIPTORS) state.size = 0;
- else that.size = 0;
- },
- // `{ Map, Set }.prototype.delete(key)` methods
- // https://tc39.es/ecma262/#sec-map.prototype.delete
- // https://tc39.es/ecma262/#sec-set.prototype.delete
- 'delete': function (key) {
- var that = this;
- var state = getInternalState(that);
- var entry = getEntry(that, key);
- if (entry) {
- var next = entry.next;
- var prev = entry.previous;
- delete state.index[entry.index];
- entry.removed = true;
- if (prev) prev.next = next;
- if (next) next.previous = prev;
- if (state.first === entry) state.first = next;
- if (state.last === entry) state.last = prev;
- if (DESCRIPTORS) state.size--;
- else that.size--;
- } return !!entry;
- },
- // `{ Map, Set }.prototype.forEach(callbackfn, thisArg = undefined)` methods
- // https://tc39.es/ecma262/#sec-map.prototype.foreach
- // https://tc39.es/ecma262/#sec-set.prototype.foreach
- forEach: function forEach(callbackfn /* , that = undefined */) {
- var state = getInternalState(this);
- var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined);
- var entry;
- while (entry = entry ? entry.next : state.first) {
- boundFunction(entry.value, entry.key, this);
- // revert to the last existing entry
- while (entry && entry.removed) entry = entry.previous;
- }
- },
- // `{ Map, Set}.prototype.has(key)` methods
- // https://tc39.es/ecma262/#sec-map.prototype.has
- // https://tc39.es/ecma262/#sec-set.prototype.has
- has: function has(key) {
- return !!getEntry(this, key);
- }
- });
-
- defineBuiltIns(Prototype, IS_MAP ? {
- // `Map.prototype.get(key)` method
- // https://tc39.es/ecma262/#sec-map.prototype.get
- get: function get(key) {
- var entry = getEntry(this, key);
- return entry && entry.value;
- },
- // `Map.prototype.set(key, value)` method
- // https://tc39.es/ecma262/#sec-map.prototype.set
- set: function set(key, value) {
- return define(this, key === 0 ? 0 : key, value);
- }
- } : {
- // `Set.prototype.add(value)` method
- // https://tc39.es/ecma262/#sec-set.prototype.add
- add: function add(value) {
- return define(this, value = value === 0 ? 0 : value, value);
- }
- });
- if (DESCRIPTORS) defineBuiltInAccessor(Prototype, 'size', {
- configurable: true,
- get: function () {
- return getInternalState(this).size;
- }
- });
- return Constructor;
- },
- setStrong: function (Constructor, CONSTRUCTOR_NAME, IS_MAP) {
- var ITERATOR_NAME = CONSTRUCTOR_NAME + ' Iterator';
- var getInternalCollectionState = internalStateGetterFor(CONSTRUCTOR_NAME);
- var getInternalIteratorState = internalStateGetterFor(ITERATOR_NAME);
- // `{ Map, Set }.prototype.{ keys, values, entries, @@iterator }()` methods
- // https://tc39.es/ecma262/#sec-map.prototype.entries
- // https://tc39.es/ecma262/#sec-map.prototype.keys
- // https://tc39.es/ecma262/#sec-map.prototype.values
- // https://tc39.es/ecma262/#sec-map.prototype-@@iterator
- // https://tc39.es/ecma262/#sec-set.prototype.entries
- // https://tc39.es/ecma262/#sec-set.prototype.keys
- // https://tc39.es/ecma262/#sec-set.prototype.values
- // https://tc39.es/ecma262/#sec-set.prototype-@@iterator
- defineIterator(Constructor, CONSTRUCTOR_NAME, function (iterated, kind) {
- setInternalState(this, {
- type: ITERATOR_NAME,
- target: iterated,
- state: getInternalCollectionState(iterated),
- kind: kind,
- last: null
- });
- }, function () {
- var state = getInternalIteratorState(this);
- var kind = state.kind;
- var entry = state.last;
- // revert to the last existing entry
- while (entry && entry.removed) entry = entry.previous;
- // get next entry
- if (!state.target || !(state.last = entry = entry ? entry.next : state.state.first)) {
- // or finish the iteration
- state.target = null;
- return createIterResultObject(undefined, true);
- }
- // return step by kind
- if (kind === 'keys') return createIterResultObject(entry.key, false);
- if (kind === 'values') return createIterResultObject(entry.value, false);
- return createIterResultObject([entry.key, entry.value], false);
- }, IS_MAP ? 'entries' : 'values', !IS_MAP, true);
-
- // `{ Map, Set }.prototype[@@species]` accessors
- // https://tc39.es/ecma262/#sec-get-map-@@species
- // https://tc39.es/ecma262/#sec-get-set-@@species
- setSpecies(CONSTRUCTOR_NAME);
- }
- };
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