org.codehaus.groovy.ast.MixinASTTransformation Maven / Gradle / Ivy
/*
* Copyright 2008 the original author or authors.
*
* 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 org.codehaus.groovy.ast;
import groovy.lang.Mixin;
import org.codehaus.groovy.ast.expr.*;
import org.codehaus.groovy.ast.stmt.BlockStatement;
import org.codehaus.groovy.ast.stmt.ExpressionStatement;
import org.codehaus.groovy.control.CompilePhase;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.transform.ASTTransformation;
import org.codehaus.groovy.transform.GroovyASTTransformation;
import org.objectweb.asm.Opcodes;
import java.util.Arrays;
@GroovyASTTransformation(phase = CompilePhase.CANONICALIZATION)
public class MixinASTTransformation implements ASTTransformation {
private static final ClassNode MY_TYPE = ClassHelper.make(Mixin.class);
// TODO would it be better to actually statically mixin the methods?
public void visit(ASTNode nodes[], SourceUnit source) {
if (nodes.length != 2 || !(nodes[0] instanceof AnnotationNode) || !(nodes[1] instanceof AnnotatedNode)) {
throw new RuntimeException("Internal error: expecting [AnnotationNode, AnnotatedNode] but got: " + Arrays.asList(nodes));
}
AnnotationNode node = (AnnotationNode) nodes[0];
AnnotatedNode parent = (AnnotatedNode) nodes[1];
if (!MY_TYPE.equals(node.getClassNode()))
return;
final Expression expr = node.getMember("value");
if (expr == null) {
return;
}
Expression useClasses = null;
if (expr instanceof ClassExpression) {
useClasses = expr;
} else if (expr instanceof ListExpression) {
ListExpression listExpression = (ListExpression) expr;
for (Expression ex : listExpression.getExpressions()) {
if (!(ex instanceof ClassExpression))
return;
}
useClasses = expr;
}
if (useClasses == null)
return;
if (parent instanceof ClassNode) {
ClassNode annotatedClass = (ClassNode) parent;
final Parameter[] noparams = new Parameter[0];
MethodNode clinit = annotatedClass.getDeclaredMethod("", noparams);
if (clinit == null) {
clinit = annotatedClass.addMethod("", Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC | Opcodes.ACC_SYNTHETIC, ClassHelper.VOID_TYPE, noparams, null, new BlockStatement());
clinit.setSynthetic(true);
}
final BlockStatement code = (BlockStatement) clinit.getCode();
code.addStatement(
new ExpressionStatement(
new MethodCallExpression(
new PropertyExpression(new ClassExpression(annotatedClass), "metaClass"),
"mixin",
useClasses
)
)
);
}
}
}
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