com.google.gwt.resources.gss.EvalFunction Maven / Gradle / Ivy
/*
* Copyright 2014 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.gss;
import com.google.gwt.resources.gss.ast.CssJavaExpressionNode;
import com.google.gwt.thirdparty.common.css.SourceCodeLocation;
import com.google.gwt.thirdparty.common.css.compiler.ast.CssValueNode;
import com.google.gwt.thirdparty.common.css.compiler.ast.ErrorManager;
import com.google.gwt.thirdparty.common.css.compiler.ast.GssFunction;
import com.google.gwt.thirdparty.common.css.compiler.ast.GssFunctionException;
import com.google.gwt.thirdparty.guava.common.collect.ImmutableList;
import java.util.List;
/**
* GSS function that creates a {@link com.google.gwt.resources.gss.ast.CssJavaExpressionNode}
* in order to evaluate a Java expression at runtime.
*/
public class EvalFunction implements GssFunction {
public static String getName() {
return "eval";
}
@Override
public List getCallResultNodes(List args, ErrorManager errorManager)
throws GssFunctionException {
CssValueNode functionToEval = args.get(0);
SourceCodeLocation sourceCodeLocation = extractSourceCodeLocation(functionToEval);
CssJavaExpressionNode result = new CssJavaExpressionNode(functionToEval.getValue(),
sourceCodeLocation);
return ImmutableList.of((CssValueNode) result);
}
@Override
public String getCallResultString(List args) throws GssFunctionException {
return args.get(0);
}
@Override
public Integer getNumExpectedArguments() {
return 1;
}
private SourceCodeLocation extractSourceCodeLocation(CssValueNode functionToEval) {
return functionToEval.getParent().getParent().getSourceCodeLocation();
}
}