git.r.bdr.sh - rbdr/dotfiles/blob - atom/packages/vim-mode/node_modules/grim/node_modules/emissary/node_modules/es6-weak-map/node_modules/es6-iterator/index.js

   1 'use strict';
   2
   3 var clear    = require('es5-ext/array/#/clear')
   4   , assign   = require('es5-ext/object/assign')
   5   , callable = require('es5-ext/object/valid-callable')
   6   , value    = require('es5-ext/object/valid-value')
   7   , d        = require('d')
   8   , autoBind = require('d/auto-bind')
   9   , Symbol   = require('es6-symbol')
  10
  11   , defineProperty = Object.defineProperty
  12   , defineProperties = Object.defineProperties
  13   , Iterator;
  14
  15 module.exports = Iterator = function (list, context) {
  16         if (!(this instanceof Iterator)) return new Iterator(list, context);
  17         defineProperties(this, {
  18                 __list__: d('w', value(list)),
  19                 __context__: d('w', context),
  20                 __nextIndex__: d('w', 0)
  21         });
  22         if (!context) return;
  23         callable(context.on);
  24         context.on('_add', this._onAdd);
  25         context.on('_delete', this._onDelete);
  26         context.on('_clear', this._onClear);
  27 };
  28
  29 defineProperties(Iterator.prototype, assign({
  30         constructor: d(Iterator),
  31         _next: d(function () {
  32                 var i;
  33                 if (!this.__list__) return;
  34                 if (this.__redo__) {
  35                         i = this.__redo__.shift();
  36                         if (i !== undefined) return i;
  37                 }
  38                 if (this.__nextIndex__ < this.__list__.length) return this.__nextIndex__++;
  39                 this._unBind();
  40         }),
  41         next: d(function () { return this._createResult(this._next()); }),
  42         _createResult: d(function (i) {
  43                 if (i === undefined) return { done: true, value: undefined };
  44                 return { done: false, value: this._resolve(i) };
  45         }),
  46         _resolve: d(function (i) { return this.__list__[i]; }),
  47         _unBind: d(function () {
  48                 this.__list__ = null;
  49                 delete this.__redo__;
  50                 if (!this.__context__) return;
  51                 this.__context__.off('_add', this._onAdd);
  52                 this.__context__.off('_delete', this._onDelete);
  53                 this.__context__.off('_clear', this._onClear);
  54                 this.__context__ = null;
  55         }),
  56         toString: d(function () { return '[object Iterator]'; })
  57 }, autoBind({
  58         _onAdd: d(function (index) {
  59                 if (index >= this.__nextIndex__) return;
  60                 ++this.__nextIndex__;
  61                 if (!this.__redo__) {
  62                         defineProperty(this, '__redo__', d('c', [index]));
  63                         return;
  64                 }
  65                 this.__redo__.forEach(function (redo, i) {
  66                         if (redo >= index) this.__redo__[i] = ++redo;
  67                 }, this);
  68                 this.__redo__.push(index);
  69         }),
  70         _onDelete: d(function (index) {
  71                 var i;
  72                 if (index >= this.__nextIndex__) return;
  73                 --this.__nextIndex__;
  74                 if (!this.__redo__) return;
  75                 i = this.__redo__.indexOf(index);
  76                 if (i !== -1) this.__redo__.splice(i, 1);
  77                 this.__redo__.forEach(function (redo, i) {
  78                         if (redo > index) this.__redo__[i] = --redo;
  79                 }, this);
  80         }),
  81         _onClear: d(function () {
  82                 if (this.__redo__) clear.call(this.__redo__);
  83                 this.__nextIndex__ = 0;
  84         })
  85 })));
  86
  87 defineProperty(Iterator.prototype, Symbol.iterator, d(function () {
  88         return this;
  89 }));
  90 defineProperty(Iterator.prototype, Symbol.toStringTag, d('', 'Iterator'));