+ },
+
+ registerMethod: function(methodName, method) {
+ this[methodName] = method;
+ },
+
+ registerTransformation: function(Transformation) {
+ return this.transformations.register(Transformation);
+ },
+
+ registerNodeMethod: function(methodName, method) {
+ this._nodeMethods[methodName] = method;
+ },
+
+ registerNodeTransformation: function(Transformation) {
+ this._nodeTransformations.register(Transformation);
+ },
+
+ registerExtension: function(extension) {
+ //debugger;
+ var doc = this,
+ existingPropertyNames = _.values(this);
+
+ var getTrans = function(desc, methodName) {
+ if(typeof desc === 'function') {
+ desc = {impl: desc};
+ }
+ if(!desc.impl) {
+ throw new Error('Got transformation description without implementation.')
+ }
+ desc.name = desc.name || methodName;
+ return desc;
+ };
+
+ [
+ {source: extension.document, target: doc},
+ {source: extension.documentNode, target: [doc.ElementNodeFactory.prototype, doc.TextNodeFactory.prototype]},
+
+ ].forEach(function(mapping) {
+ if(mapping.source) {
+ if(mapping.source.methods) {
+ existingPropertyNames = _.values(mapping.target)
+ _.pairs(mapping.source.methods).forEach(function(pair) {
+ var methodName = pair[0],
+ method = pair[1],
+ targets = _.isArray(mapping.target) ? mapping.target : [mapping.target];
+ if(_.contains(existingPropertyNames, methodName)) {
+ throw new Error('Cannot extend {target} with method name {methodName}. Name already exists.'
+ .replace('{target}', mapping.target)
+ .replace('{methodName}', methodName)
+ );
+ }
+ targets.forEach(function(target) {
+ if(target === doc) {
+ target.registerMethod(methodName, method);
+ } else {
+ doc.registerNodeMethod(methodName, method);
+ }
+
+ });
+ });
+ }
+
+ if(mapping.source.transformations) {
+ _.pairs(mapping.source.transformations).forEach(function(pair) {
+ var transformation = getTrans(pair[1], pair[0]),
+ targets = _.isArray(mapping.target) ? mapping.target : [mapping.target];
+ targets.forEach(function(target) {
+ if(target === doc) {
+ target.registerTransformation(transformations.createContextTransformation(transformation));
+ } else {
+ doc.registerNodeTransformation(transformations.createContextTransformation(transformation));
+ }
+
+
+ });
+ });
+ }
+ }
+ });
+ },
+
+ transform: function(transformation, args) {
+ //console.log('transform');
+ var Transformation, toret;
+ if(typeof transformation === 'string') {
+ Transformation = this.transformations.get(transformation);
+ if(Transformation) {
+ transformation = new Transformation(this, this, args);
+ }
+ }
+ if(transformation) {
+ this._transformationLevel++;
+ toret = transformation.run();
+ if(this._transformationLevel === 1) {
+ this.undoStack.push(transformation);
+ }
+ 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);
+ }
+ },
+ redo: function() {
+ var transformation = this.redoStack.pop();
+ if(transformation) {
+ transformation.run();
+ this.undoStack.push(transformation);
+ }
+ },
+
+ getNodeByPath: function(path) {
+ var toret = this.root;
+ path.forEach(function(idx) {
+ toret = toret.contents()[idx];
+ });
+ return toret;