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small fix for lists
[fnpeditor.git] / src / smartxml / smartxml.js
diff --git a/src/smartxml/smartxml.js b/src/smartxml/smartxml.js
index d74ec13..c158bac 100644 (file)
--- a/src/smartxml/smartxml.js
+++ b/src/smartxml/smartxml.js
@@ -4,27 +4,36 @@ define([
     'libs/backbone',
     'smartxml/events',
     'smartxml/transformations',
     'libs/backbone',
     'smartxml/events',
     'smartxml/transformations',
-    'smartxml/core'
-], function($, _, Backbone, events, transformations, coreTransformations) {
+    'smartxml/core',
+    'smartxml/fragments'
+], function($, _, Backbone, events, transformations, coreTransformations, fragments) {
     
 'use strict';
 /* globals Node */
 
     
 'use strict';
 /* globals Node */
 
-var TEXT_NODE = Node.TEXT_NODE;
-
 
 
+var privateKey = '_smartxml';
 
 var DocumentNode = function(nativeNode, document) {
     if(!document) {
         throw new Error('undefined document for a node');
     }
     this.document = document;
 
 var DocumentNode = function(nativeNode, document) {
     if(!document) {
         throw new Error('undefined document for a node');
     }
     this.document = document;
+    this.object = {};
     this._setNativeNode(nativeNode);
 
 };
 
 $.extend(DocumentNode.prototype, {
 
     this._setNativeNode(nativeNode);
 
 };
 
 $.extend(DocumentNode.prototype, {
 
+    getProperty: function(propName) {
+        var toret = this.object[propName];
+        if(toret && _.isFunction(toret)) {
+            toret = toret.call(this);
+        }
+        return toret;
+    },
+
     transform: function(Transformation, args) {
         var transformation = new Transformation(this.document, this, args);
         return this.document.transform(transformation);
     transform: function(Transformation, args) {
         var transformation = new Transformation(this.document, this, args);
         return this.document.transform(transformation);
@@ -36,18 +45,28 @@ $.extend(DocumentNode.prototype, {
     },
 
     clone: function() {
     },
 
     clone: function() {
-        var clone = this._$.clone(true, true);
-        // clone.find('*').addBack().each(function() {
-        //     var n = $(this);
-        //     if(n.data('canvasElement')) {
-        //         n.data('canvasElement', $.extend(true, {}, n.data('canvasElement')));
-        //         n.data('canvasElement').$element = n.data('canvasElement').$element.clone(true, true);
-        //     }
-        // });
+        var clone = this._$.clone(true, true),
+            node = this;
+        clone.find('*').addBack().each(function() {
+            var el = this,
+                clonedData = $(this).data();
+            $(el).removeData(privateKey);
+            _.pairs(clonedData).forEach(function(pair) {
+                var key = pair[0],
+                    value = pair[1];
+                if(_.isFunction(value.clone)) {
+                    clonedData[key] = value.clone(node.document.createDocumentNode(el));
+                }
+            });
+        });
         return this.document.createDocumentNode(clone[0]);
     },
 
     getPath: function(ancestor) {
         return this.document.createDocumentNode(clone[0]);
     },
 
     getPath: function(ancestor) {
+        if(!(this.document.containsNode(this))) {
+            return null;
+        }
+
         var nodePath = [this].concat(this.parents()),
             toret, idx;
         ancestor = ancestor || this.document.root;
         var nodePath = [this].concat(this.parents()),
             toret, idx;
         ancestor = ancestor || this.document.root;
@@ -59,7 +78,7 @@ $.extend(DocumentNode.prototype, {
             }
         });
 
             }
         });
 
-        if(idx !== 'undefined') {
+        if(idx !== undefined) {
             nodePath = nodePath.slice(0, idx);
         }
         toret = nodePath.map(function(node) {return node.getIndex(); });
             nodePath = nodePath.slice(0, idx);
         }
         toret = nodePath.map(function(node) {return node.getIndex(); });
@@ -71,6 +90,14 @@ $.extend(DocumentNode.prototype, {
         return this.document.root.sameNode(this);
     },
 
         return this.document.root.sameNode(this);
     },
 
+    isInDocument: function() {
+        return this.document.containsNode(this);
+    },
+
+    isSiblingOf: function(node) {
+        return node && this.parent().sameNode(node.parent());
+    },
+
     sameNode: function(otherNode) {
         return !!(otherNode) && this.nativeNode === otherNode.nativeNode;
     },
     sameNode: function(otherNode) {
         return !!(otherNode) && this.nativeNode === otherNode.nativeNode;
     },
@@ -106,10 +133,18 @@ $.extend(DocumentNode.prototype, {
         return myIdx < parentContents.length - 1 ? parentContents[myIdx+1] : null;
     },
 
         return myIdx < parentContents.length - 1 ? parentContents[myIdx+1] : null;
     },
 
-    isSurroundedByTextElements: function() {
-        var prev = this.prev(),
-            next = this.next();
-        return prev && (prev.nodeType === Node.TEXT_NODE) && next && (next.nodeType === Node.TEXT_NODE);
+    isSurroundedByTextNodes: function() {
+        return this.isPrecededByTextNode() && this.isFollowedByTextNode();
+    },
+
+    isPrecededByTextNode: function() {
+        var prev = this.prev();
+        return prev && prev.nodeType === Node.TEXT_NODE;
+    },
+
+    isFollowedByTextNode: function() {
+        var next = this.next();
+        return next && next.nodeType === Node.TEXT_NODE;
     },
 
     triggerChangeEvent: function(type, metaData, origParent, nodeWasContained) {
     },
 
     triggerChangeEvent: function(type, metaData, origParent, nodeWasContained) {
@@ -118,7 +153,7 @@ $.extend(DocumentNode.prototype, {
         if(type === 'nodeDetached' || this.document.containsNode(event.meta.node)) {
             this.document.trigger('change', event);
         }
         if(type === 'nodeDetached' || this.document.containsNode(event.meta.node)) {
             this.document.trigger('change', event);
         }
-        if((type === 'nodeAdded' || type === 'nodeMoved') && !this.document.containsNode(this) && nodeWasContained) {
+        if(type === 'nodeAdded' && !this.document.containsNode(this) && nodeWasContained) {
              event = new events.ChangeEvent('nodeDetached', {node: node, parent: origParent});
              this.document.trigger('change', event);
         }
              event = new events.ChangeEvent('nodeDetached', {node: node, parent: origParent});
              this.document.trigger('change', event);
         }
@@ -129,28 +164,41 @@ $.extend(DocumentNode.prototype, {
     },
 
     getIndex: function() {
     },
 
     getIndex: function() {
+        var parent;
+
         if(this.isRoot()) {
             return 0;
         }
         if(this.isRoot()) {
             return 0;
         }
-        return this.parent().indexOf(this);
+
+        parent = this.parent();
+        return parent ? parent.indexOf(this) : undefined;
+    },
+
+    getNearestElementNode: function() {
+        return this.nodeType === Node.ELEMENT_NODE ? this : this.parent();
     }
 });
 
 
 var ElementNode = function(nativeNode, document) {
     DocumentNode.call(this, nativeNode, document);
     }
 });
 
 
 var ElementNode = function(nativeNode, document) {
     DocumentNode.call(this, nativeNode, document);
+    $(nativeNode).data(privateKey, {node: this});
 };
 ElementNode.prototype = Object.create(DocumentNode.prototype);
 
 $.extend(ElementNode.prototype, {
     nodeType: Node.ELEMENT_NODE,
 
 };
 ElementNode.prototype = Object.create(DocumentNode.prototype);
 
 $.extend(ElementNode.prototype, {
     nodeType: Node.ELEMENT_NODE,
 
-    setData: function(key, value) {
-        if(value !== undefined) {
-            this._$.data(key, value);
+    setData: function(arg1, arg2) {
+        if(arguments.length === 2) {
+            if(_.isUndefined(arg2)) {
+                this._$.removeData(arg1);
+            } else {
+                this._$.data(arg1, arg2);
+            }
         } else {
             this._$.removeData(_.keys(this._$.data()));
         } else {
             this._$.removeData(_.keys(this._$.data()));
-            this._$.data(key);
+            this._$.data(arg1);
         }
     },
 
         }
     },
 
@@ -158,7 +206,9 @@ $.extend(ElementNode.prototype, {
         if(key) {
             return this._$.data(key);
         }
         if(key) {
             return this._$.data(key);
         }
-        return this._$.data();
+        var toret = _.clone(this._$.data());
+        delete toret[privateKey];
+        return toret;
     },
 
     getTagName: function() {
     },
 
     getTagName: function() {
@@ -196,6 +246,36 @@ $.extend(ElementNode.prototype, {
         return toret;
     },
 
         return toret;
     },
 
+    containsNode: function(node) {
+        return node && (node.nativeNode === this.nativeNode || node._$.parents().index(this._$) !== -1);
+    },
+
+    getFirstTextNode: function() {
+        return this._getTextNode('first');
+    },
+
+    getLastTextNode: function() {
+        return this._getTextNode('last');
+    },
+
+    _getTextNode: function(which) {
+        var contents = this.contents(),
+            toret;
+        if(which === 'last') {
+            contents = contents.reverse();
+        }
+        contents.some(function(node) {
+            if(node.nodeType === Node.TEXT_NODE) {
+                toret = node;
+                return true;
+            }
+            toret = node.getLastTextNode();
+            return !!toret;
+        });
+
+        return toret;
+    },
+
     toXML: function() {
         var wrapper = $('<div>');
         wrapper.append(this._getXMLDOMToDump());
     toXML: function() {
         var wrapper = $('<div>');
         wrapper.append(this._getXMLDOMToDump());
@@ -210,16 +290,42 @@ $.extend(ElementNode.prototype, {
 
 var TextNode = function(nativeNode, document) {
     DocumentNode.call(this, nativeNode, document);
 
 var TextNode = function(nativeNode, document) {
     DocumentNode.call(this, nativeNode, document);
+    this._data = Object.create({});
+    nativeNode.__smartxmlTextNodeInstance = this;
 };
 TextNode.prototype = Object.create(DocumentNode.prototype);
 
 $.extend(TextNode.prototype, {
     nodeType: Node.TEXT_NODE,
 
 };
 TextNode.prototype = Object.create(DocumentNode.prototype);
 
 $.extend(TextNode.prototype, {
     nodeType: Node.TEXT_NODE,
 
+    setData: function(arg1, arg2) {
+        if(arguments.length === 2) {
+            if(_.isUndefined(arg2)) {
+                delete this._data[arg1];
+            } else {
+                this._data[arg1] = arg2;
+            }
+        } else {
+            this._data = _.extend({}, arg1);
+        }
+    },
+
+    getData: function(key) {
+        if(key) {
+            return this._data[key];
+        }
+        return this._data;
+    },
+
     getText: function() {
         return this.nativeNode.data;
     },
 
     getText: function() {
         return this.nativeNode.data;
     },
 
+
+    containsNode: function() {
+        return false;
+    },
+
     triggerTextChangeEvent: function() {
         var event = new events.ChangeEvent('nodeTextChange', {node: this});
         this.document.trigger('change', event);
     triggerTextChangeEvent: function() {
         var event = new events.ChangeEvent('nodeTextChange', {node: this});
         this.document.trigger('change', event);
@@ -228,17 +334,21 @@ $.extend(TextNode.prototype, {
 
 
 var parseXML = function(xml) {
 
 
 var parseXML = function(xml) {
-    return $($.trim(xml))[0];
+    var toret = $($.trim(xml));
+    if(toret.length !== 1) {
+        throw new Error('Unable to parse XML: ' + xml);
+    }
+    return toret[0];
+
 };
 
 var registerTransformation = function(desc, name, target) {
     var Transformation = transformations.createContextTransformation(desc, name);
 };
 
 var registerTransformation = function(desc, name, target) {
     var Transformation = transformations.createContextTransformation(desc, name);
-    //+ to sie powinna nazywac registerTransformationFromDesc or sth
-    //+ ew. spr czy nie override (tylko jesli powyzej sa prototypy to trudno do nich dojsc)
-    target[name] = function(args) {
-        var instance = this;
+    target[name] = function() {
+        var instance = this,
+            args = Array.prototype.slice.call(arguments, 0);
         return instance.transform(Transformation, args);
         return instance.transform(Transformation, args);
-    }
+    };
 };
 
 var registerMethod = function(methodName, method, target) {
 };
 
 var registerMethod = function(methodName, method, target) {
@@ -252,10 +362,10 @@ var registerMethod = function(methodName, method, target) {
 };
 
 
 };
 
 
-var Document = function(xml) {
-    this.loadXML(xml);
+var Document = function(xml, extensions) {
     this.undoStack = [];
     this.redoStack = [];
     this.undoStack = [];
     this.redoStack = [];
+    this._currentTransaction = null;
     this._transformationLevel = 0;
     
     this._nodeMethods = {};
     this._transformationLevel = 0;
     
     this._nodeMethods = {};
@@ -264,25 +374,48 @@ var Document = function(xml) {
     this._nodeTransformations = {};
     this._textNodeTransformations = {};
     this._elementNodeTransformations = {};
     this._nodeTransformations = {};
     this._textNodeTransformations = {};
     this._elementNodeTransformations = {};
+    
+    this.registerExtension(coreTransformations);
+
+    (extensions || []).forEach(function(extension) {
+        this.registerExtension(extension);
+    }.bind(this));
+    this.loadXML(xml);
 };
 
 };
 
-$.extend(Document.prototype, Backbone.Events, {
+$.extend(Document.prototype, Backbone.Events, fragments, {
     ElementNodeFactory: ElementNode,
     TextNodeFactory: TextNode,
 
     createDocumentNode: function(from) {
     ElementNodeFactory: ElementNode,
     TextNodeFactory: TextNode,
 
     createDocumentNode: function(from) {
-        if(!(from instanceof Node)) {
-            if(from.text !== undefined) {
-                /* globals document */
-                from = document.createTextNode(from.text);
-            } else {
-                var node = $('<' + from.tagName + '>');
+        var cached;
 
 
-                _.keys(from.attrs || {}).forEach(function(key) {
-                    node.attr(key, from.attrs[key]);
-                });
+        if(from instanceof Node) {
+            /* globals Text */
+            cached = from instanceof Text ? from.__smartxmlTextNodeInstance : ($(from).data(privateKey) || {}).node;
+            if(cached instanceof DocumentNode) {
+                return cached;
+            }
+        } else {
+            if(typeof from === 'string') {
+                from = parseXML(from);
+                this.normalizeXML(from);
+            } else {
+                if(from.text !== undefined) {
+                    /* globals document */
+                    from = document.createTextNode(from.text);
+                } else {
+                    if(!from.tagName) {
+                        throw new Error('tagName missing');
+                    }
+                    var node = $('<' + from.tagName + '>');
+
+                    _.keys(from.attrs || {}).forEach(function(key) {
+                        node.attr(key, from.attrs[key]);
+                    });
 
 
-                from = node[0];
+                    from = node[0];
+                }
             }
         }
         var Factory, typeMethods, typeTransformations;
             }
         }
         var Factory, typeMethods, typeTransformations;
@@ -298,25 +431,37 @@ $.extend(Document.prototype, Backbone.Events, {
         var toret = new Factory(from, this);
         _.extend(toret, this._nodeMethods);
         _.extend(toret, typeMethods);
         var toret = new Factory(from, this);
         _.extend(toret, this._nodeMethods);
         _.extend(toret, typeMethods);
+        
         _.extend(toret, this._nodeTransformations);
         _.extend(toret, typeTransformations);
         _.extend(toret, this._nodeTransformations);
         _.extend(toret, typeTransformations);
+        
+        toret.__super__ = _.extend({}, this._nodeMethods, this._nodeTransformations);
+        _.keys(toret.__super__).forEach(function(key) {
+            toret.__super__[key] = _.bind(toret.__super__[key], toret);
+        });
+
         return toret;
     },
 
     loadXML: function(xml, options) {
         options = options || {};
         return toret;
     },
 
     loadXML: function(xml, options) {
         options = options || {};
-        defineDocumentProperties(this, $(parseXML(xml)));
+        this._defineDocumentProperties($(parseXML(xml)));
+        this.normalizeXML(this.dom);
         if(!options.silent) {
             this.trigger('contentSet');
         }
     },
 
         if(!options.silent) {
             this.trigger('contentSet');
         }
     },
 
+    normalizeXML: function(nativeNode) {
+        void(nativeNode); // noop
+    },
+
     toXML: function() {
         return this.root.toXML();
     },
 
     containsNode: function(node) {
     toXML: function() {
         return this.root.toXML();
     },
 
     containsNode: function(node) {
-        return this.root && (node.nativeNode === this.root.nativeNode || node._$.parents().index(this.root._$) !== -1);
+        return this.root && this.root.containsNode(node);
     },
 
     getSiblingParents: function(params) {
     },
 
     getSiblingParents: function(params) {
@@ -328,18 +473,21 @@ $.extend(Document.prototype, Backbone.Events, {
             return noSiblingParents;
         }
 
             return noSiblingParents;
         }
 
-        var i;
-        for(i = 0; i < Math.min(parents1.length, parents2.length); i++) {
+        var stop = Math.min(parents1.length, parents2.length),
+            i;
+        for(i = 0; i < stop; i++) {
             if(parents1[i].sameNode(parents2[i])) {
                 continue;
             }
             break;
         }
             if(parents1[i].sameNode(parents2[i])) {
                 continue;
             }
             break;
         }
+        if(i === stop) {
+            i--;
+        }
         return {node1: parents1[i], node2: parents2[i]};
     },
 
     trigger: function() {
         return {node1: parents1[i], node2: parents2[i]};
     },
 
     trigger: function() {
-        //console.log('trigger: ' + arguments[0] + (arguments[1] ? ', ' + arguments[1].type : ''));
         Backbone.Events.trigger.apply(this, arguments);
     },
 
         Backbone.Events.trigger.apply(this, arguments);
     },
 
@@ -378,9 +526,7 @@ $.extend(Document.prototype, Backbone.Events, {
     },
 
     registerExtension: function(extension) {
     },
 
     registerExtension: function(extension) {
-        //debugger;
-        var doc = this,
-            existingPropertyNames = _.values(this);
+        var doc = this;
 
         ['document', 'documentNode', 'elementNode', 'textNode'].forEach(function(dstName) {
             var dstExtension = extension[dstName];
 
         ['document', 'documentNode', 'elementNode', 'textNode'].forEach(function(dstName) {
             var dstExtension = extension[dstName];
@@ -406,11 +552,35 @@ $.extend(Document.prototype, Backbone.Events, {
         });
     },
 
         });
     },
 
+    ifChanged: function(context, action, documentChangedHandler, documentUnchangedHandler) {
+        var hasChanged = false,
+            changeMonitor = function() {
+                hasChanged = true;
+            };
+
+        this.on('change', changeMonitor);
+        action.call(context);
+        this.off('change', changeMonitor);
+        
+        if(hasChanged) {
+            if(documentChangedHandler) {
+                documentChangedHandler.call(context);
+            }
+        } else {
+            if(documentUnchangedHandler) {
+                documentUnchangedHandler.call(context);
+            }
+        }
+    },
+
     transform: function(Transformation, args) {
     transform: function(Transformation, args) {
-        //console.log('transform');
         var toret, transformation;
 
         var toret, transformation;
 
-        // ref: odrebnie przygotowanie transformacji, odrebnie jej wykonanie (to pierwsze to analog transform z node)
+        if(!this._currentTransaction) {
+            return this.transaction(function() {
+                return this.transform(Transformation, args);
+            }, {context: this});
+        }
 
         if(typeof Transformation === 'function') {
             transformation = new Transformation(this, this, args);
 
         if(typeof Transformation === 'function') {
             transformation = new Transformation(this, this, args);
@@ -419,56 +589,176 @@ $.extend(Document.prototype, Backbone.Events, {
         }
         if(transformation) {
             this._transformationLevel++;
         }
         if(transformation) {
             this._transformationLevel++;
-            toret = transformation.run();
-            if(this._transformationLevel === 1) {
-                this.undoStack.push(transformation);
-            }
+            
+            this.ifChanged(
+                this,
+                function() {
+                    toret = transformation.run({beUndoable:this._transformationLevel === 1});
+                },
+                function() {
+                    if(this._transformationLevel === 1 && !this._undoInProgress) {
+                        this._currentTransaction.pushTransformation(transformation);
+                        this.redoStack = [];
+                    }
+                }
+            );
+
             this._transformationLevel--;
             this._transformationLevel--;
-            //console.log('clearing redo stack');
-            this.redoStack = [];
             return toret;
         } else {
             throw new Error('Transformation ' + transformation + ' doesn\'t exist!');
         }
     },
     undo: function() {
             return toret;
         } else {
             throw new Error('Transformation ' + transformation + ' doesn\'t exist!');
         }
     },
     undo: function() {
-        var transformation = this.undoStack.pop();
-        if(transformation) {
-            transformation.undo();
-            this.redoStack.push(transformation);
+        var transaction = this.undoStack.pop(),
+            doc = this,
+            transformations, stopAt;
+
+        if(transaction) {
+            this._undoInProgress = true;
+
+            // We will modify this array in a minute so make sure we work on a copy.
+            transformations = transaction.transformations.slice(0);
+
+            if(transformations.length > 1) {
+                // In case of real transactions we don't want to run undo on all of transformations if we don't have to.
+                transformations.some(function(t, idx) {
+                    if(!t.undo && t.getChangeRoot().sameNode(doc.root)) {
+                        stopAt = idx;
+                        return true; //break
+                    }
+                });
+                if(stopAt !== undefined) {
+                    // We will get away with undoing only this transformations as the one at stopAt reverses the whole document.
+                    transformations = transformations.slice(0, stopAt+1);
+                }
+            }
+
+            transformations.reverse();
+            transformations.forEach(function(t) {
+                t.undo();
+            });
+
+            this._undoInProgress = false;
+            this.redoStack.push(transaction);
+            this.trigger('operationEnd');
         }
     },
     redo: function() {
         }
     },
     redo: function() {
-        var transformation = this.redoStack.pop();
-        if(transformation) {
-            transformation.run();
-            this.undoStack.push(transformation);
+        var transaction = this.redoStack.pop();
+        if(transaction) {
+            this._transformationLevel++;
+            transaction.transformations.forEach(function(t) {
+                t.run({beUndoable: true});
+            });
+            this._transformationLevel--;
+            this.undoStack.push(transaction);
+            this.trigger('operationEnd');
+
+        }
+    },
+
+    startTransaction: function(metadata) {
+        if(this._currentTransaction) {
+            throw new Error('Nested transactions not supported!');
+        }
+        this._rollbackBackup = this.root.clone();
+        this._currentTransaction = new Transaction([], metadata);
+    },
+
+    endTransaction: function() {
+        if(!this._currentTransaction) {
+            throw new Error('End of transaction requested, but there is no transaction in progress!');
         }
         }
+        if(this._currentTransaction.hasTransformations()) {
+            this.undoStack.push(this._currentTransaction);
+            this.trigger('operationEnd');
+        }
+        this._currentTransaction = null;
+    },
+
+    rollbackTransaction: function() {
+        if(!this._currentTransaction) {
+            throw new Error('Transaction rollback requested, but there is no transaction in progress!');
+        }
+        this.replaceRoot(this._rollbackBackup);
+        this._rollbackBackup = null;
+        this._currentTransaction = null;
+        this._transformationLevel = 0;
+    },
+
+    transaction: function(callback, params) {
+        var toret;
+        params = params || {};
+        this.startTransaction(params.metadata);
+        try {
+            toret = callback.call(params.context || this);
+        } catch(e) {
+            if(params.error) {
+                params.error(e);
+            }
+            this.rollbackTransaction();
+            return;
+        }
+        this.endTransaction();
+        if(params.success) {
+            params.success(toret);
+        }
+        return toret;
     },
 
     getNodeByPath: function(path) {
         var toret = this.root;
     },
 
     getNodeByPath: function(path) {
         var toret = this.root;
-        path.forEach(function(idx) {
+        path.some(function(idx) {
             toret = toret.contents()[idx];
             toret = toret.contents()[idx];
+            if(!toret) {
+                return true;
+            }
         });
         return toret;
         });
         return toret;
+    },
+
+    _defineDocumentProperties: function($document) {
+        var doc = this;
+        Object.defineProperty(doc, 'root', {get: function() {
+            if(!$document) {
+                return null;
+            }
+            return doc.createDocumentNode($document[0]);
+        }, configurable: true});
+        Object.defineProperty(doc, 'dom', {get: function() {
+            if(!$document) {
+                return null;
+            }
+            return $document[0];
+        }, configurable: true});
+    },
+
+    createFragment: function(Type, params) {
+        if(!Type.prototype instanceof fragments.Fragment) {
+            throw new Error('Can\'t create a fragment: `Type` is not a valid Fragment');
+        }
+        return new Type(this, params);
     }
 });
 
     }
 });
 
-var defineDocumentProperties = function(doc, $document) {
-    Object.defineProperty(doc, 'root', {get: function() {
-        return doc.createDocumentNode($document[0]);
-    }, configurable: true});
-    Object.defineProperty(doc, 'dom', {get: function() {
-        return $document[0];
-    }, configurable: true});
+var Transaction = function(transformations, metadata) {
+    this.transformations = transformations || [];
+    this.metadata = metadata;
 };
 };
+$.extend(Transaction.prototype, {
+    pushTransformation: function(transformation) {
+        this.transformations.push(transformation);
+    },
+    hasTransformations: function() {
+        return this.transformations.length > 0;
+    }
+});
 
 
 return {
     documentFromXML: function(xml) {
         var doc = new Document(xml);
 
 
 return {
     documentFromXML: function(xml) {
         var doc = new Document(xml);
-        doc.registerExtension(coreTransformations);
         return doc;
     },
 
         return doc;
     },