diff options
Diffstat (limited to 'node_modules/es6-iterator/index.js')
-rw-r--r-- | node_modules/es6-iterator/index.js | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/node_modules/es6-iterator/index.js b/node_modules/es6-iterator/index.js new file mode 100644 index 000000000..10fd08958 --- /dev/null +++ b/node_modules/es6-iterator/index.js @@ -0,0 +1,90 @@ +'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')); |