src/smartxml/transformations.js

   1 define(function(require) {
   2
   3 'use strict';
   4
   5 var _ = require('libs/underscore'),
   6     toret = {};
   7
   8 var getTransDesc = function(desc, name) {
   9     if(typeof desc === 'function') {
  10         desc = {impl: desc};
  11     }
  12     if(!desc.impl) {
  13         throw new Error('Got transformation description without implementation.')
  14     }
  15     return desc;
  16 };
  17
  18 toret.createGenericTransformation = function(desc, name) {
  19     desc = getTransDesc(desc);
  20
  21     var GenericTransformation = function(document, args) {
  22         this.args = args || [];
  23
  24         var transformation = this;
  25         // _.keys(this.args).forEach(function(key) {
  26         //     if(transformation.args[key].nodeType) { //@@ change to instanceof check, fix circular dependency
  27         //         var value = transformation.args[key],
  28         //             path = value.getPath();
  29         //         Object.defineProperty(transformation.args, key, {
  30         //             get: function() {
  31         //                 if(transformation.hasRun) {
  32         //                     //console.log('returning via path');
  33         //                     return transformation.document.getNodeByPath(path);
  34         //                 } else {
  35         //                     //console.log('returning original arg');
  36         //                     return value;
  37
  38         //                 }
  39         //             }
  40         //         });
  41         //     }
  42         // });
  43
  44         // potem spr na dotychczasowych undo/redo tests;
  45         this.args.forEach(function(arg, idx, args) {
  46             if(arg.nodeType) { // ~
  47                 var path = arg.getPath();
  48                 Object.defineProperty(args, idx, {
  49                     get: function() {
  50                         if(transformation.hasRun) {
  51                             return transformation.document.getNodeByPath(path);
  52                         } else {
  53                             return arg;
  54                         }
  55                     }
  56                 });
  57             }
  58         });
  59
  60         this.document = document;
  61         this.hasRun = false;
  62         if(desc.init) {
  63             desc.init.call(this);
  64         }
  65     };
  66     _.extend(GenericTransformation.prototype, {
  67         name: name,
  68         run: function() {
  69             var changeRoot;
  70             if(!desc.undo) {
  71                 changeRoot = desc.getChangeRoot ? desc.getChangeRoot.call(this) : this.document.root;
  72                 this.snapshot = changeRoot.clone();
  73                 this.changeRootPath = changeRoot.getPath();
  74             }
  75             //var toret = desc.impl.call(this.context, this.args); // a argumenty do metody?
  76             var toret = desc.impl.apply(this.context, this.args);
  77             this.hasRun = true;
  78             return toret;
  79         },
  80         undo: function() {
  81             if(desc.undo) {
  82                 desc.undo.call(this.context);
  83             } else {
  84                 this.document.getNodeByPath(this.changeRootPath).replaceWith(this.snapshot);
  85             }
  86         },
  87     });
  88
  89     return GenericTransformation;
  90 };
  91 // var T = createGenericTransformation({impl: function() {}});
  92 // var t = T(doc, {a:1,b:2,c3:3});
  93
  94
  95 toret.createContextTransformation = function(desc, name) {
  96     // mozna sie pozbyc przez przeniesienie object/context na koniec argumentow konstruktora generic transformation
  97     var GenericTransformation = toret.createGenericTransformation(desc, name);
  98
  99     var ContextTransformation = function(document, object, args) {
 100         GenericTransformation.call(this, document, args);
 101
 102         if(document === object) {
 103             this.context = document;
 104         } else {
 105             var contextPath = object.getPath(),
 106                 transformation = this;
 107             Object.defineProperty(this, 'context', {
 108                 get: function() {
 109                     // todo: to jakos inaczej, bo np. this.context w undo transformacji before to juz nie ten sam obiekt
 110                     // moze transformacja powinna zwracac zmodyfikowana sciezke do obiektu po dzialaniu run?
 111
 112                     if(transformation.hasRun) {
 113                         //console.log('returning via path');
 114                         return transformation.document.getNodeByPath(contextPath);
 115                     } else {
 116                         //console.log('returning original arg');
 117                         return object;
 118
 119                     }
 120                 }
 121             });
 122         }
 123     }
 124     ContextTransformation.prototype = Object.create(GenericTransformation.prototype);
 125     return ContextTransformation;
 126 }
 127 // var T = createContextTransformation({impl: function() {}});
 128 // var t = T(doc, node, {a:1,b:2,c3:3});
 129 ///
 130
 131
 132
 133 toret.TransformationStorage = function() {
 134     this._transformations = {};
 135 };
 136
 137 _.extend(toret.TransformationStorage.prototype, {
 138
 139     register: function(Transformation) {
 140         var list = (this._transformations[Transformation.prototype.name] = this._transformations[Transformation.prototype.name] || []);
 141         list.push(Transformation);
 142     },
 143
 144     get: function(name) {
 145         var transformations = this._transformations[name];
 146         if(!transformations) {
 147             throw new Error('Transformation "' + name + '" not found!');
 148         }
 149         // na razie zwraca pierwsza
 150         return transformations[0];
 151     }
 152 });
 153
 154
 155
 156 // var registerTransformationFromMethod = (object, methodName, desc) {
 157 //         if(!object[methodName]) {
 158 //             throw new Exeption('Cannot register transformation from unknown method ' + methodName + ' on ' + object);
 159 //         }
 160 //         desc.impl = object[name];
 161 //         Transformation = createContextTransformation(desc);
 162 //         object.prototype.registerContextTransformation(name, createContextTransformation(method));
 163 // };
 164
 165
 166 // registerTransformationFromMethod(ElementNode, 'setAttr', {
 167 //     impl: function(args) {
 168 //         this.setAttr(args.name, args.value);
 169 //     },
 170 //     getChangeRoot: function() {
 171 //         return this.context;
 172 //     }
 173
 174 // });
 175
 176 return toret;
 177
 178 });