smartxml: helper functions

[fnpeditor.git] / src / smartxml / smartxml.js

diff --git a/src/smartxml/smartxml.js b/src/smartxml/smartxml.js
index 5cadcd7..dcecc64 100644 (file)
--- a/src/smartxml/smartxml.js
+++ b/src/smartxml/smartxml.js
@@ -78,6 +78,10 @@ $.extend(DocumentNode.prototype, {
         return this.document.root.sameNode(this);
     },
 
+    isSiblingOf: function(node) {
+        return node && this.parent().sameNode(node.parent());
+    },
+
     sameNode: function(otherNode) {
         return !!(otherNode) && this.nativeNode === otherNode.nativeNode;
     },
@@ -143,6 +147,10 @@ $.extend(DocumentNode.prototype, {
             return 0;
         }
         return this.parent().indexOf(this);
+    },
+
+    getNearestElementNode: function() {
+        return this.nodeType === Node.ELEMENT_NODE ? this : this.parent();
     }
 });
 
@@ -479,7 +487,7 @@ $.extend(Document.prototype, Backbone.Events, {
         if(!this._currentTransaction) {
             return this.transaction(function() {
                 return this.transform(Transformation, args);
-            }, this);
+            }, {context: this});
         }
 
         if(typeof Transformation === 'function') {
@@ -498,8 +506,6 @@ $.extend(Document.prototype, Backbone.Events, {
                 function() {
                     if(this._transformationLevel === 1 && !this._undoInProgress) {
                         this._currentTransaction.pushTransformation(transformation);
-                    }
-                    if(!this._undoInProgress && this._transformationLevel === 1) {
                         this.redoStack = [];
                     }
                 }
@@ -558,11 +564,12 @@ $.extend(Document.prototype, Backbone.Events, {
         }
     },
 
-    startTransaction: function() {
+    startTransaction: function(metadata) {
         if(this._currentTransaction) {
             throw new Error('Nested transactions not supported!');
         }
-        this._currentTransaction = new Transaction([]);
+        this._rollbackBackup = this.root.clone();
+        this._currentTransaction = new Transaction([], metadata);
     },
 
     endTransaction: function() {
@@ -575,11 +582,33 @@ $.extend(Document.prototype, Backbone.Events, {
         this._currentTransaction = null;
     },
 
-    transaction: function(callback, context) {
+    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;
-        this.startTransaction();
-        toret = callback.call(context);
+        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;
     },
 
@@ -608,8 +637,9 @@ $.extend(Document.prototype, Backbone.Events, {
     }
 });
 
-var Transaction = function(transformations) {
+var Transaction = function(transformations, metadata) {
     this.transformations = transformations || [];
+    this.metadata = metadata;
 };
 $.extend(Transaction.prototype, {
     pushTransformation: function(transformation) {