/*
* Copyright 2009 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.resources.css;
import com.google.gwt.core.ext.BadPropertyValueException;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.resources.css.ast.Context;
import com.google.gwt.resources.css.ast.CssCompilerException;
import com.google.gwt.resources.css.ast.CssIf;
import com.google.gwt.resources.css.ast.CssVisitor;
import com.google.gwt.resources.ext.ClientBundleRequirements;
/**
* Analyzes a stylesheet to update the ClientBundleRequirements interface.
*/
public class RequirementsCollector extends CssVisitor {
private final TreeLogger logger;
private final ClientBundleRequirements requirements;
public RequirementsCollector(TreeLogger logger,
ClientBundleRequirements requirements) {
this.logger = logger.branch(TreeLogger.DEBUG,
"Scanning CSS for requirements");
this.requirements = requirements;
}
@Override
public void endVisit(CssIf x, Context ctx) {
String propertyName = x.getPropertyName();
if (propertyName != null) {
try {
requirements.addPermutationAxis(propertyName);
} catch (BadPropertyValueException e) {
logger.log(TreeLogger.ERROR, "Unknown deferred-binding property "
+ propertyName, e);
throw new CssCompilerException("Unknown deferred-binding property", e);
}
}
}
}