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'use strict';
var clear = require('es5-ext/array/#/clear')
, assign = require('es5-ext/object/assign')
, callable = require('es5-ext/object/valid-callable')
, value = require('es5-ext/object/valid-value')
, d = require('d')
, autoBind = require('d/auto-bind')
, Symbol = require('es6-symbol')
, defineProperty = Object.defineProperty
, defineProperties = Object.defineProperties
, Iterator;
module.exports = Iterator = function (list, context) {
if (!(this instanceof Iterator)) return new Iterator(list, context);
defineProperties(this, {
__list__: d('w', value(list)),
__context__: d('w', context),
__nextIndex__: d('w', 0)
});
if (!context) return;
callable(context.on);
context.on('_add', this._onAdd);
context.on('_delete', this._onDelete);
context.on('_clear', this._onClear);
};
defineProperties(Iterator.prototype, assign({
constructor: d(Iterator),
_next: d(function () {
var i;
if (!this.__list__) return;
if (this.__redo__) {
i = this.__redo__.shift();
if (i !== undefined) return i;
}
if (this.__nextIndex__ < this.__list__.length) return this.__nextIndex__++;
this._unBind();
}),
next: d(function () { return this._createResult(this._next()); }),
_createResult: d(function (i) {
if (i === undefined) return { done: true, value: undefined };
return { done: false, value: this._resolve(i) };
}),
_resolve: d(function (i) { return this.__list__[i]; }),
_unBind: d(function () {
this.__list__ = null;
delete this.__redo__;
if (!this.__context__) return;
this.__context__.off('_add', this._onAdd);
this.__context__.off('_delete', this._onDelete);
this.__context__.off('_clear', this._onClear);
this.__context__ = null;
}),
toString: d(function () { return '[object Iterator]'; })
}, autoBind({
_onAdd: d(function (index) {
if (index >= this.__nextIndex__) return;
++this.__nextIndex__;
if (!this.__redo__) {
defineProperty(this, '__redo__', d('c', [index]));
return;
}
this.__redo__.forEach(function (redo, i) {
if (redo >= index) this.__redo__[i] = ++redo;
}, this);
this.__redo__.push(index);
}),
_onDelete: d(function (index) {
var i;
if (index >= this.__nextIndex__) return;
--this.__nextIndex__;
if (!this.__redo__) return;
i = this.__redo__.indexOf(index);
if (i !== -1) this.__redo__.splice(i, 1);
this.__redo__.forEach(function (redo, i) {
if (redo > index) this.__redo__[i] = --redo;
}, this);
}),
_onClear: d(function () {
if (this.__redo__) clear.call(this.__redo__);
this.__nextIndex__ = 0;
})
})));
defineProperty(Iterator.prototype, Symbol.iterator, d(function () {
return this;
}));
defineProperty(Iterator.prototype, Symbol.toStringTag, d('', 'Iterator'));
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