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Groovy: A powerful, dynamic language for the JVM
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.codehaus.groovy.transform.sc.transformers;
import groovy.lang.IntRange;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.ConstructorNode;
import org.codehaus.groovy.ast.MethodNode;
import org.codehaus.groovy.ast.Parameter;
import org.codehaus.groovy.ast.expr.ArgumentListExpression;
import org.codehaus.groovy.ast.expr.ConstantExpression;
import org.codehaus.groovy.ast.expr.ConstructorCallExpression;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.RangeExpression;
import org.codehaus.groovy.transform.stc.StaticTypesMarker;
import java.util.List;
/**
* This transformer focuses on ranges to produce optimized bytecode.
*
* @author Cedric Champeau
*/
public class RangeExpressionTransformer {
private static final ClassNode INTRANGE_TYPE = ClassHelper.make(IntRange.class);
private static final MethodNode INTRANGE_CTOR;
static {
final List declaredConstructors = INTRANGE_TYPE.getDeclaredConstructors();
ConstructorNode target = null;
for (ConstructorNode constructor : declaredConstructors) {
final Parameter[] parameters = constructor.getParameters();
if (parameters.length==3 && ClassHelper.boolean_TYPE.equals(parameters[0].getOriginType())) {
target = constructor;
break;
}
}
INTRANGE_CTOR = target;
}
private final StaticCompilationTransformer transformer;
public RangeExpressionTransformer(final StaticCompilationTransformer transformer) {
this.transformer = transformer;
}
public Expression transformRangeExpression(RangeExpression range) {
final ClassNode inferred = range.getNodeMetaData(StaticTypesMarker.INFERRED_TYPE);
if (INTRANGE_TYPE.equals(inferred)) {
ArgumentListExpression bounds = new ArgumentListExpression(new ConstantExpression(range.isInclusive(),true),range.getFrom(), range.getTo());
ConstructorCallExpression cce = new ConstructorCallExpression(INTRANGE_TYPE, bounds);
cce.setSourcePosition(range);
cce.putNodeMetaData(StaticTypesMarker.DIRECT_METHOD_CALL_TARGET, INTRANGE_CTOR);
cce.putNodeMetaData(StaticTypesMarker.INFERRED_TYPE, INTRANGE_TYPE);
return transformer.transform(cce);
}
return transformer.superTransform(range);
}
}