X-Git-Url: https://git.mdrn.pl/fnpeditor.git/blobdiff_plain/be657bf05cf1a986983b7e5583f32db116f9ebe9..2e65999ad3791878b245ead3d0fa8442d74fd1b2:/src/smartxml/smartxml.js?ds=inline

diff --git a/src/smartxml/smartxml.js b/src/smartxml/smartxml.js
index dbe0290..8039916 100644
--- a/src/smartxml/smartxml.js
+++ b/src/smartxml/smartxml.js
@@ -3,41 +3,35 @@ define([
     'libs/underscore',
     'libs/backbone',
     'smartxml/events',
-    'smartxml/transformations'
-], function($, _, Backbone, events, transformations) {
+    'smartxml/transformations',
+    'smartxml/core',
+    'smartxml/fragments'
+], function($, _, Backbone, events, transformations, coreTransformations, fragments) {
     
 'use strict';
 /* globals Node */
 
-var TEXT_NODE = Node.TEXT_NODE;
-
-
-var INSERTION = function(implementation) {
-    var toret = function(node) {
-        var insertion = this.getNodeInsertion(node),
-            nodeWasContained = this.document.containsNode(insertion.ofNode),
-            nodeParent;
-        if(!(this.document.containsNode(this))) {
-            nodeParent = insertion.ofNode.parent();
-        }
-        implementation.call(this, insertion.ofNode.nativeNode);
-        this.triggerChangeEvent(insertion.insertsNew ? 'nodeAdded' : 'nodeMoved', {node: insertion.ofNode}, nodeParent, nodeWasContained);
-        return insertion.ofNode;
-    };
-    return toret;
-};
 
 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, {
 
+    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);
@@ -49,18 +43,28 @@ $.extend(DocumentNode.prototype, {
     },
 
     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();
+
+            _.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) {
+        if(!(this.document.containsNode(this))) {
+            return null;
+        }
+
         var nodePath = [this].concat(this.parents()),
             toret, idx;
         ancestor = ancestor || this.document.root;
@@ -72,7 +76,7 @@ $.extend(DocumentNode.prototype, {
             }
         });
 
-        if(idx !== 'undefined') {
+        if(idx !== undefined) {
             nodePath = nodePath.slice(0, idx);
         }
         toret = nodePath.map(function(node) {return node.getIndex(); });
@@ -84,21 +88,12 @@ $.extend(DocumentNode.prototype, {
         return this.document.root.sameNode(this);
     },
 
-    detach: function() {
-        var parent = this.parent();
-        this._$.detach();
-        this.triggerChangeEvent('nodeDetached', {parent: parent});
-        return this;
+    isInDocument: function() {
+        return this.document.containsNode(this);
     },
 
-    replaceWith: function(node) {
-        var toret;
-        if(this.isRoot()) {
-            return this.document.replaceRoot(node);
-        }
-        toret = this.after(node);
-        this.detach();
-        return toret;
+    isSiblingOf: function(node) {
+        return node && this.parent().sameNode(node.parent());
     },
 
     sameNode: function(otherNode) {
@@ -136,43 +131,18 @@ $.extend(DocumentNode.prototype, {
         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();
     },
 
-    after: INSERTION(function(nativeNode) {
-        return this._$.after(nativeNode);
-    }),
-
-    before: INSERTION(function(nativeNode) {
-        return this._$.before(nativeNode);
-    }),
-
-    wrapWith: function(node) {
-        var insertion = this.getNodeInsertion(node);
-        if(this.parent()) {
-            this.before(insertion.ofNode);
-        }
-        insertion.ofNode.append(this);
-        return insertion.ofNode;
+    isPrecededByTextNode: function() {
+        var prev = this.prev();
+        return prev && prev.nodeType === Node.TEXT_NODE;
     },
 
-    /**
-    * Removes parent of a node if node has no siblings.
-    */
-    unwrap: function() {
-        if(this.isRoot()) {
-            return;
-        }
-        var parent = this.parent(),
-            grandParent;
-        if(parent.contents().length === 1) {
-            grandParent = parent.parent();
-            parent.unwrapContent();
-            return grandParent;
-        }
+    isFollowedByTextNode: function() {
+        var next = this.next();
+        return next && next.nodeType === Node.TEXT_NODE;
     },
 
     triggerChangeEvent: function(type, metaData, origParent, nodeWasContained) {
@@ -181,7 +151,7 @@ $.extend(DocumentNode.prototype, {
         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);
         }
@@ -196,9 +166,14 @@ $.extend(DocumentNode.prototype, {
             return 0;
         }
         return this.parent().indexOf(this);
+    },
+
+    getNearestElementNode: function() {
+        return this.nodeType === Node.ELEMENT_NODE ? this : this.parent();
     }
 });
 
+
 var ElementNode = function(nativeNode, document) {
     DocumentNode.call(this, nativeNode, document);
 };
@@ -207,22 +182,16 @@ ElementNode.prototype = Object.create(DocumentNode.prototype);
 $.extend(ElementNode.prototype, {
     nodeType: Node.ELEMENT_NODE,
 
-    detach: function() {
-        var next;
-        if(this.parent() && this.isSurroundedByTextElements()) {
-            next = this.next();
-            this.prev().appendText(next.getText());
-            next.detach();
-        }
-        return DocumentNode.prototype.detach.call(this);
-    },
-
-    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._$.data()));
-            this._$.data(key);
+            this._$.data(arg1);
         }
     },
 
@@ -256,37 +225,10 @@ $.extend(ElementNode.prototype, {
         return this._$.contents().index(node._$);
     },
 
-    setTag: function(tagName) {
-        var node = this.document.createDocumentNode({tagName: tagName}),
-            oldTagName = this.getTagName(),
-            myContents = this._$.contents();
-
-        this.getAttrs().forEach(function(attribute) {
-            node.setAttr(attribute.name, attribute.value, true);
-        });
-        node.setData(this.getData());
-
-        if(this.sameNode(this.document.root)) {
-            defineDocumentProperties(this.document, node._$);
-        }
-        this._$.replaceWith(node._$);
-        this._setNativeNode(node._$[0]);
-        this._$.append(myContents);
-        this.triggerChangeEvent('nodeTagChange', {oldTagName: oldTagName, newTagName: this.getTagName()});
-    },
-
     getAttr: function(name) {
         return this._$.attr(name);
     },
 
-    setAttr: function(name, value, silent) {
-        var oldVal = this.getAttr(name);
-        this._$.attr(name, value);
-        if(!silent) {
-            this.triggerChangeEvent('nodeAttrChange', {attr: name, oldVal: oldVal, newVal: value});
-        }
-    },
-
     getAttrs: function() {
         var toret = [];
         for(var i = 0; i < this.nativeNode.attributes.length; i++) {
@@ -295,74 +237,24 @@ $.extend(ElementNode.prototype, {
         return toret;
     },
 
-    append: INSERTION(function(nativeNode) {
-        this._$.append(nativeNode);
-    }),
-
-    prepend: INSERTION(function(nativeNode) {
-        this._$.prepend(nativeNode);
-    }),
-
-    insertAtIndex: function(nativeNode, index) {
-        var contents = this.contents();
-        if(index < contents.length) {
-            return contents[index].before(nativeNode);
-        } else if(index === contents.length) {
-            return this.append(nativeNode);
-        }
+    containsNode: function(node) {
+        return node && (node.nativeNode === this.nativeNode || node._$.parents().index(this._$) !== -1);
     },
 
-    unwrapContent: function() {
-        var parent = this.parent();
-        if(!parent) {
-            return;
-        }
-
-        var myContents = this.contents(),
-            myIdx = parent.indexOf(this);
-
-
-        if(myContents.length === 0) {
-            return this.detach();
-        }
-
-        var prev = this.prev(),
-            next = this.next(),
-            moveLeftRange, moveRightRange, leftMerged;
-
-        if(prev && (prev.nodeType === TEXT_NODE) && (myContents[0].nodeType === TEXT_NODE)) {
-            prev.appendText(myContents[0].getText());
-            myContents[0].detach();
-            moveLeftRange = true;
-            leftMerged = true;
-        } else {
-            leftMerged = false;
-        }
+    getLastTextNode: function() {
+        var contents = this.contents(),
+            toret;
 
-        if(!(leftMerged && myContents.length === 1)) {
-            var lastContents = _.last(myContents);
-            if(next && (next.nodeType === TEXT_NODE) && (lastContents.nodeType === TEXT_NODE)) {
-                next.prependText(lastContents.getText());
-                lastContents.detach();
-                moveRightRange = true;
+        contents.reverse().some(function(node) {
+            if(node.nodeType === Node.TEXT_NODE) {
+                toret = node;
+                return true;
             }
-        }
-
-        var childrenLength = this.contents().length;
-        this.contents().forEach(function(child) {
-            this.before(child);
-        }.bind(this));
-
-        this.detach();
-
-        return {
-            element1: parent.contents()[myIdx + (moveLeftRange ? -1 : 0)],
-            element2: parent.contents()[myIdx + childrenLength-1 + (moveRightRange ? 1 : 0)]
-        };
-    },
+            toret = node.getLastTextNode();
+            return !!toret;
+        });
 
-    wrapText: function(params) {
-        return this.document._wrapText(_.extend({inside: this}, params));
+        return toret;
     },
 
     toXML: function() {
@@ -376,6 +268,7 @@ $.extend(ElementNode.prototype, {
     }
 });
 
+
 var TextNode = function(nativeNode, document) {
     DocumentNode.call(this, nativeNode, document);
 };
@@ -388,72 +281,9 @@ $.extend(TextNode.prototype, {
         return this.nativeNode.data;
     },
 
-    setText: function(text) {
-        //console.log('smartxml: ' + text);
-        this.nativeNode.data = text;
-        this.triggerTextChangeEvent();
-    },
-
-    appendText: function(text) {
-        this.nativeNode.data = this.nativeNode.data + text;
-        this.triggerTextChangeEvent();
-    },
-
-    prependText: function(text) {
-        this.nativeNode.data = text + this.nativeNode.data;
-        this.triggerTextChangeEvent();
-    },
-
-    wrapWith: function(desc) {
-        if(typeof desc.start === 'number' && typeof desc.end === 'number') {
-            return this.document._wrapText({
-                inside: this.parent(),
-                textNodeIdx: this.parent().indexOf(this),
-                offsetStart: Math.min(desc.start, desc.end),
-                offsetEnd: Math.max(desc.start, desc.end),
-                _with: {tagName: desc.tagName, attrs: desc.attrs}
-            });
-        } else {
-            return DocumentNode.prototype.wrapWith.call(this, desc);
-        }
-    },
-
-    split: function(params) {
-        var parentElement = this.parent(),
-            passed = false,
-            succeedingChildren = [],
-            prefix = this.getText().substr(0, params.offset),
-            suffix = this.getText().substr(params.offset);
-
-        parentElement.contents().forEach(function(child) {
-            if(passed) {
-                succeedingChildren.push(child);
-            }
-            if(child.sameNode(this)) {
-                passed = true;
-            }
-        }.bind(this));
-
-        if(prefix.length > 0) {
-            this.setText(prefix);
-        }
-        else {
-            this.detach();
-        }
-
-        var attrs = {};
-        parentElement.getAttrs().forEach(function(attr) {attrs[attr.name] = attr.value; });
-        var newElement = this.document.createDocumentNode({tagName: parentElement.getTagName(), attrs: attrs});
-        parentElement.after(newElement);
-
-        if(suffix.length > 0) {
-            newElement.append({text: suffix});
-        }
-        succeedingChildren.forEach(function(child) {
-            newElement.append(child);
-        });
 
-        return {first: parentElement, second: newElement};
+    containsNode: function() {
+        return false;
     },
 
     triggerTextChangeEvent: function() {
@@ -464,15 +294,21 @@ $.extend(TextNode.prototype, {
 
 
 var parseXML = function(xml) {
-    return $($.trim(xml))[0];
+    var toret = $($.trim(xml));
+    if(!toret.length) {
+        throw new Error('Unable to parse XML: ' + xml);
+    }
+    return toret[0];
+
 };
 
 var registerTransformation = function(desc, name, target) {
     var Transformation = transformations.createContextTransformation(desc, name);
-    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);
-    }
+    };
 };
 
 var registerMethod = function(methodName, method, target) {
@@ -486,10 +322,10 @@ var registerMethod = function(methodName, method, target) {
 };
 
 
-var Document = function(xml) {
-    this.loadXML(xml);
+var Document = function(xml, extensions) {
     this.undoStack = [];
     this.redoStack = [];
+    this._currentTransaction = null;
     this._transformationLevel = 0;
     
     this._nodeMethods = {};
@@ -498,25 +334,40 @@ var Document = function(xml) {
     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) {
         if(!(from instanceof Node)) {
-            if(from.text !== undefined) {
-                /* globals document */
-                from = document.createTextNode(from.text);
+            if(typeof from === 'string') {
+                from = parseXML(from);
+                this.normalizeXML(from);
             } else {
-                var node = $('<' + from.tagName + '>');
-
-                _.keys(from.attrs || {}).forEach(function(key) {
-                    node.attr(key, from.attrs[key]);
-                });
+                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;
@@ -532,61 +383,37 @@ $.extend(Document.prototype, Backbone.Events, {
         var toret = new Factory(from, this);
         _.extend(toret, this._nodeMethods);
         _.extend(toret, typeMethods);
+        
         _.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 || {};
-        defineDocumentProperties(this, $(parseXML(xml)));
+        this._defineDocumentProperties($(parseXML(xml)));
+        this.normalizeXML(this.dom);
         if(!options.silent) {
             this.trigger('contentSet');
         }
     },
 
+    normalizeXML: function(nativeNode) {
+        void(nativeNode); // noop
+    },
+
     toXML: function() {
         return this.root.toXML();
     },
 
     containsNode: function(node) {
-        return this.root && (node.nativeNode === this.root.nativeNode || node._$.parents().index(this.root._$) !== -1);
-    },
-
-    wrapNodes: function(params) {
-        if(!(params.node1.parent().sameNode(params.node2.parent()))) {
-            throw new Error('Wrapping non-sibling nodes not supported.');
-        }
-
-        var parent = params.node1.parent(),
-            parentContents = parent.contents(),
-            wrapper = this.createDocumentNode({
-                tagName: params._with.tagName,
-                attrs: params._with.attrs}),
-            idx1 = parent.indexOf(params.node1),
-            idx2 = parent.indexOf(params.node2);
-
-        if(idx1 > idx2) {
-            var tmp = idx1;
-            idx1 = idx2;
-            idx2 = tmp;
-        }
-
-        var insertingMethod, insertingTarget;
-        if(idx1 === 0) {
-            insertingMethod = 'prepend';
-            insertingTarget = parent;
-        } else {
-            insertingMethod = 'after';
-            insertingTarget = parentContents[idx1-1];
-        }
-
-        for(var i = idx1; i <= idx2; i++) {
-            wrapper.append(parentContents[i].detach());
-        }
-
-        insertingTarget[insertingMethod](wrapper);
-        return wrapper;
+        return this.root && this.root.containsNode(node);
     },
 
     getSiblingParents: function(params) {
@@ -598,68 +425,21 @@ $.extend(Document.prototype, Backbone.Events, {
             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;
         }
-        return {node1: parents1[i], node2: parents2[i]};
-    },
-
-    _wrapText: function(params) {
-        params = _.extend({textNodeIdx: 0}, params);
-        if(typeof params.textNodeIdx === 'number') {
-            params.textNodeIdx = [params.textNodeIdx];
-        }
-        
-        var contentsInside = params.inside.contents(),
-            idx1 = Math.min.apply(Math, params.textNodeIdx),
-            idx2 = Math.max.apply(Math, params.textNodeIdx),
-            textNode1 = contentsInside[idx1],
-            textNode2 = contentsInside[idx2],
-            sameNode = textNode1.sameNode(textNode2),
-            prefixOutside = textNode1.getText().substr(0, params.offsetStart),
-            prefixInside = textNode1.getText().substr(params.offsetStart),
-            suffixInside = textNode2.getText().substr(0, params.offsetEnd),
-            suffixOutside = textNode2.getText().substr(params.offsetEnd)
-        ;
-
-        if(!(textNode1.parent().sameNode(textNode2.parent()))) {
-            throw new Error('Wrapping text in non-sibling text nodes not supported.');
-        }
-        
-        var wrapperElement = this.createDocumentNode({tagName: params._with.tagName, attrs: params._with.attrs});
-        textNode1.after(wrapperElement);
-        textNode1.detach();
-        
-        if(prefixOutside.length > 0) {
-            wrapperElement.before({text:prefixOutside});
-        }
-        if(sameNode) {
-            var core = textNode1.getText().substr(params.offsetStart, params.offsetEnd - params.offsetStart);
-            wrapperElement.append({text: core});
-        } else {
-            textNode2.detach();
-            if(prefixInside.length > 0) {
-                wrapperElement.append({text: prefixInside});
-            }
-            for(var i = idx1 + 1; i < idx2; i++) {
-                wrapperElement.append(contentsInside[i]);
-            }
-            if(suffixInside.length > 0) {
-                wrapperElement.append({text: suffixInside});
-            }
-        }
-        if(suffixOutside.length > 0) {
-            wrapperElement.after({text: suffixOutside});
+        if(i === stop) {
+            i--;
         }
-        return wrapperElement;
+        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);
     },
 
@@ -675,14 +455,6 @@ $.extend(Document.prototype, Backbone.Events, {
         return insertion;
     },
 
-    replaceRoot: function(node) {
-        var insertion = this.getNodeInsertion(node);
-        this.root.detach();
-        defineDocumentProperties(this, insertion.ofNode._$);
-        insertion.ofNode.triggerChangeEvent('nodeAdded');
-        return insertion.ofNode;
-    },
-
     registerMethod: function(methodName, method, dstName) {
         var doc = this;
         var destination = {
@@ -706,9 +478,7 @@ $.extend(Document.prototype, Backbone.Events, {
     },
 
     registerExtension: function(extension) {
-        //debugger;
-        var doc = this,
-            existingPropertyNames = _.values(this);
+        var doc = this;
 
         ['document', 'documentNode', 'elementNode', 'textNode'].forEach(function(dstName) {
             var dstExtension = extension[dstName];
@@ -734,10 +504,36 @@ $.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) {
-        //console.log('transform');
         var toret, transformation;
 
+        if(!this._currentTransaction) {
+            return this.transaction(function() {
+                return this.transform(Transformation, args);
+            }, {context: this});
+        }
+
         if(typeof Transformation === 'function') {
             transformation = new Transformation(this, this, args);
         } else {
@@ -745,31 +541,123 @@ $.extend(Document.prototype, Backbone.Events, {
         }
         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--;
-            //console.log('clearing redo stack');
-            this.redoStack = [];
             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.
+                stopAt = undefined;
+                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() {
-        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) {
@@ -778,22 +666,50 @@ $.extend(Document.prototype, Backbone.Events, {
             toret = toret.contents()[idx];
         });
         return toret;
+    },
+
+    _defineDocumentProperties: function($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) {
-        return new Document(xml);
+        var doc = new Document(xml);
+        return doc;
     },
 
     elementNodeFromXML: function(xml) {