/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.uibinder.parsers;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.uibinder.rebind.UiBinderWriter;
import com.google.gwt.uibinder.rebind.XMLAttribute;
import com.google.gwt.uibinder.rebind.XMLElement;
import java.util.HashMap;
import java.util.Map;
/**
* Assigns computed values to element attributes, e.g. nasty old
* resources:styleName="style.pretty" and nice new
* styleName={resources.style.pretty}, which will become something like
* myWidget.setStyleName(resources.style().pretty()) in the generated code.
*/
class ComputedAttributeInterpreter implements XMLElement.Interpreter<String> {
private final UiBinderWriter writer;
public ComputedAttributeInterpreter(UiBinderWriter writer) {
this.writer = writer;
}
public String interpretElement(XMLElement elem)
throws UnableToCompleteException {
Map<String, String> attNameToToken = new HashMap<String, String>();
for (int i = elem.getAttributeCount() - 1; i >= 0; i--) {
XMLAttribute att = elem.getAttribute(i);
AttributeParser parser = writer.getBundleAttributeParser(att);
if (parser == null && att.hasComputedValue()) {
/*
* It's okay to simply create a string parser by hand, rather than
* asking the writer to magically guess what kind of parser we need,
* because we are only used in string contexts, for attributes in html
* markup. Bean parser takes care of the strongly typed cases.
*/
parser = new StringAttributeParser();
}
if (parser != null) {
String parsedValue = parser.parse(att.consumeValue(), writer);
String attToken = writer.tokenForExpression(parsedValue);
attNameToToken.put(att.getLocalName(), attToken);
}
}
for (Map.Entry<String, String> attr : attNameToToken.entrySet()) {
elem.setAttribute(attr.getKey(), attr.getValue());
}
// Return null because we don't want to replace the dom element
return null;
}
}