Processor for UiBinder.

class Processor<O> {
 
 Parser _parser;
 O _owner;
 
 /**
  * Create new instance. 
  */
 Processor(this._owner) {
   _parser = new Parser<O>();
   // Parse owner to find annotations
   _parser.parse(_owner);
 }
 
 /**
  * Parse template and bind filds to elements from template wrapped to widgets.
  */
 void parse(Element root) {
   _process(root);
 }
 
 /**
  * Process each [element] of owner.
  */
 void _process(Element element) {
   Node child = element.firstChild;
   // We only processing Eements
   while (child != null) {
     if (child is Element) {
       _tryToAssign(child as Element);
     }
     
     if (child.hasChildNodes()) {
       _process(child);
     }

     if (child is Element) {
       child = (child as Element).nextElementSibling;
     } else {
       child = child.nextNode;
     }
   } 
 }
 
 /**
  * Try to assign [element] to one of fields of owner.
  */
 void _tryToAssign(Element element) {
   String field = element.attributes["ui:field"]; //$dom_getAttribute("ui:field");
   if (field != null) {
     _tryToInstantiateVariable(field, element);
   }
 }
 
 /**
  * Try to instantiate [field] wrapping [element]. 
  */
 void _tryToInstantiateVariable(String field, Element element) {
   try {
     // Get variable by name
     VariableMirror variableMirror = _parser.variables[field];
     // Instantiate widget by 'wrap' constructor
      dynamic variable = Creator.instantiateWidget(variableMirror.type, element).reflectee;
      // Set widget to variable in owner
      _parser.ownerInstance.setField(variableMirror.simpleName, variable);
   } on Exception catch(ex) {
     print(ex);
   }
 }
}