src/smartxml/transformations.js

   1 define(function(require) {
   2
   3 'use strict';
   4
   5 var _ = require('libs/underscore'),
   6     toret = {};
   7
   8
   9 toret.createGenericTransformation = function(desc) {
  10
  11     var GenericTransformation = function(document, args) {
  12         this.args = args || {};
  13
  14         var transformation = this;
  15         _.keys(this.args).forEach(function(key) {
  16             if(transformation.args[key].nodeType) { //@@ change to instanceof check, fix circular dependency
  17                 var value = transformation.args[key],
  18                     path = value.getPath();
  19                 Object.defineProperty(transformation.args, key, {
  20                     get: function() {
  21                         if(transformation.hasRun) {
  22                             //console.log('returning via path');
  23                             return transformation.document.getNodeByPath(path);
  24                         } else {
  25                             //console.log('returning original arg');
  26                             return value;
  27
  28                         }
  29                     }
  30                 });
  31             }
  32         });
  33         this.document = document;
  34         this.hasRun = false;
  35         if(desc.init) {
  36             desc.init.call(this);
  37         }
  38     };
  39     _.extend(GenericTransformation.prototype, {
  40         name: desc.name,
  41         run: function() {
  42             var changeRoot;
  43             if(!desc.undo) {
  44                 changeRoot = desc.getChangeRoot ? desc.getChangeRoot.call(this) : this.document.root;
  45                 this.snapshot = changeRoot.clone();
  46                 this.changeRootPath = changeRoot.getPath();
  47             }
  48             var toret = desc.impl.call(this.context, this.args); // a argumenty do metody?
  49             this.hasRun = true;
  50             return toret;
  51         },
  52         undo: function() {
  53             if(desc.undo) {
  54                 desc.undo.call(this.context);
  55             } else {
  56                 this.document.getNodeByPath(this.changeRootPath).replaceWith(this.snapshot);
  57             }
  58         },
  59     });
  60
  61     return GenericTransformation;
  62 };
  63 // var T = createGenericTransformation({impl: function() {}});
  64 // var t = T(doc, {a:1,b:2,c3:3});
  65
  66
  67 toret.createContextTransformation = function(desc) {
  68     // mozna sie pozbyc przez przeniesienie object/context na koniec argumentow konstruktora generic transformation
  69     var GenericTransformation = toret.createGenericTransformation(desc);
  70
  71     var ContextTransformation = function(document, object, args) {
  72         GenericTransformation.call(this, document, args);
  73
  74         if(document === object) {
  75             this.context = document;
  76         } else {
  77             var contextPath = object.getPath();
  78             Object.defineProperty(this, 'context', {
  79                 get: function() {
  80                     // todo: to jakos inaczej, bo np. this.context w undo transformacji before to juz nie ten sam obiekt
  81                     // moze transformacja powinna zwracac zmodyfikowana sciezke do obiektu po dzialaniu run?
  82
  83                     // tu tez trick z hasRun
  84                     return document.getNodeByPath(contextPath);
  85                 }
  86             });
  87         }
  88     }
  89     ContextTransformation.prototype = Object.create(GenericTransformation.prototype);
  90     return ContextTransformation;
  91 }
  92 // var T = createContextTransformation({impl: function() {}});
  93 // var t = T(doc, node, {a:1,b:2,c3:3});
  94 ///
  95
  96
  97
  98 toret.TransformationStorage = function() {
  99     this._transformations = {};
 100 };
 101
 102 _.extend(toret.TransformationStorage.prototype, {
 103
 104     register: function(Transformation) {
 105         var list = (this._transformations[Transformation.prototype.name] = this._transformations[Transformation.prototype.name] || []);
 106         list.push(Transformation);
 107     },
 108
 109     get: function(name) {
 110         var transformations = this._transformations[name];
 111         if(!transformations) {
 112             throw new Error('Transformation "' + name + '" not found!');
 113         }
 114         // na razie zwraca pierwsza
 115         return transformations[0];
 116     }
 117 });
 118
 119
 120
 121 // var registerTransformationFromMethod = (object, methodName, desc) {
 122 //         if(!object[methodName]) {
 123 //             throw new Exeption('Cannot register transformation from unknown method ' + methodName + ' on ' + object);
 124 //         }
 125 //         desc.impl = object[name];
 126 //         Transformation = createContextTransformation(desc);
 127 //         object.prototype.registerContextTransformation(name, createContextTransformation(method));
 128 // };
 129
 130
 131 // registerTransformationFromMethod(ElementNode, 'setAttr', {
 132 //     impl: function(args) {
 133 //         this.setAttr(args.name, args.value);
 134 //     },
 135 //     getChangeRoot: function() {
 136 //         return this.context;
 137 //     }
 138
 139 // });
 140
 141 return toret;
 142
 143 });