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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);
}
};