"use strict";
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var clear = require("es5-ext/array/#/clear")
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, assign = require("es5-ext/object/assign")
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, callable = require("es5-ext/object/valid-callable")
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, value = require("es5-ext/object/valid-value")
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, d = require("d")
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, autoBind = require("d/auto-bind")
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, Symbol = require("es6-symbol");
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var defineProperty = Object.defineProperty, defineProperties = Object.defineProperties, Iterator;
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module.exports = Iterator = function (list, context) {
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if (!(this instanceof Iterator)) throw new TypeError("Constructor requires 'new'");
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defineProperties(this, {
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__list__: d("w", value(list)),
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__context__: d("w", context),
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__nextIndex__: d("w", 0)
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});
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if (!context) return;
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callable(context.on);
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context.on("_add", this._onAdd);
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context.on("_delete", this._onDelete);
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context.on("_clear", this._onClear);
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};
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// Internal %IteratorPrototype% doesn't expose its constructor
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delete Iterator.prototype.constructor;
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defineProperties(
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Iterator.prototype,
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assign(
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{
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_next: d(function () {
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var i;
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if (!this.__list__) return undefined;
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if (this.__redo__) {
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i = this.__redo__.shift();
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if (i !== undefined) return i;
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}
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if (this.__nextIndex__ < this.__list__.length) return this.__nextIndex__++;
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this._unBind();
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return undefined;
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}),
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next: d(function () {
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return this._createResult(this._next());
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}),
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_createResult: d(function (i) {
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if (i === undefined) return { done: true, value: undefined };
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return { done: false, value: this._resolve(i) };
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}),
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_resolve: d(function (i) {
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return this.__list__[i];
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}),
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_unBind: d(function () {
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this.__list__ = null;
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delete this.__redo__;
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if (!this.__context__) return;
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this.__context__.off("_add", this._onAdd);
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this.__context__.off("_delete", this._onDelete);
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this.__context__.off("_clear", this._onClear);
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this.__context__ = null;
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}),
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toString: d(function () {
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return "[object " + (this[Symbol.toStringTag] || "Object") + "]";
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})
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},
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autoBind({
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_onAdd: d(function (index) {
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if (index >= this.__nextIndex__) return;
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++this.__nextIndex__;
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if (!this.__redo__) {
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defineProperty(this, "__redo__", d("c", [index]));
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return;
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}
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this.__redo__.forEach(function (redo, i) {
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if (redo >= index) this.__redo__[i] = ++redo;
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}, this);
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this.__redo__.push(index);
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}),
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_onDelete: d(function (index) {
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var i;
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if (index >= this.__nextIndex__) return;
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--this.__nextIndex__;
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if (!this.__redo__) return;
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i = this.__redo__.indexOf(index);
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if (i !== -1) this.__redo__.splice(i, 1);
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this.__redo__.forEach(function (redo, j) {
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if (redo > index) this.__redo__[j] = --redo;
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}, this);
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}),
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_onClear: d(function () {
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if (this.__redo__) clear.call(this.__redo__);
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this.__nextIndex__ = 0;
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})
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})
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)
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);
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defineProperty(
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Iterator.prototype,
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Symbol.iterator,
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d(function () {
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return this;
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})
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);
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