| /* |
| * 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; |
| |
| import groovy.transform.BaseScript; |
| import org.codehaus.groovy.ast.ASTNode; |
| import org.codehaus.groovy.ast.AnnotatedNode; |
| import org.codehaus.groovy.ast.AnnotationNode; |
| import org.codehaus.groovy.ast.ClassHelper; |
| import org.codehaus.groovy.ast.ClassNode; |
| import org.codehaus.groovy.ast.ConstructorNode; |
| import org.codehaus.groovy.ast.ImportNode; |
| import org.codehaus.groovy.ast.MethodNode; |
| import org.codehaus.groovy.ast.PackageNode; |
| import org.codehaus.groovy.ast.Parameter; |
| import org.codehaus.groovy.ast.expr.ClassExpression; |
| import org.codehaus.groovy.ast.expr.DeclarationExpression; |
| import org.codehaus.groovy.ast.expr.EmptyExpression; |
| import org.codehaus.groovy.ast.expr.Expression; |
| import org.codehaus.groovy.ast.expr.VariableExpression; |
| import org.codehaus.groovy.control.CompilePhase; |
| import org.codehaus.groovy.control.SourceUnit; |
| |
| import java.util.List; |
| |
| import static org.apache.groovy.ast.tools.ClassNodeUtils.addGeneratedMethod; |
| |
| /** |
| * Handles transformation for the @BaseScript annotation. |
| */ |
| @GroovyASTTransformation(phase = CompilePhase.SEMANTIC_ANALYSIS) |
| public class BaseScriptASTTransformation extends AbstractASTTransformation { |
| |
| private static final Class<BaseScript> MY_CLASS = BaseScript.class; |
| public static final ClassNode MY_TYPE = ClassHelper.make(MY_CLASS); |
| private static final String MY_TYPE_NAME = "@" + MY_TYPE.getNameWithoutPackage(); |
| private static final Parameter[] CONTEXT_CTOR_PARAMETERS = {new Parameter(ClassHelper.BINDING_TYPE, "context")}; |
| |
| public void visit(ASTNode[] nodes, SourceUnit source) { |
| init(nodes, source); |
| AnnotatedNode parent = (AnnotatedNode) nodes[1]; |
| AnnotationNode node = (AnnotationNode) nodes[0]; |
| if (!MY_TYPE.equals(node.getClassNode())) return; |
| |
| if (parent instanceof DeclarationExpression) { |
| changeBaseScriptTypeFromDeclaration((DeclarationExpression) parent, node); |
| } else if (parent instanceof ImportNode || parent instanceof PackageNode) { |
| changeBaseScriptTypeFromPackageOrImport(source, parent, node); |
| } else if (parent instanceof ClassNode) { |
| changeBaseScriptTypeFromClass((ClassNode) parent, node); |
| } |
| } |
| |
| private void changeBaseScriptTypeFromPackageOrImport(final SourceUnit source, final AnnotatedNode parent, final AnnotationNode node) { |
| Expression value = node.getMember("value"); |
| if (!(value instanceof ClassExpression)) { |
| addError("Annotation " + MY_TYPE_NAME + " member 'value' should be a class literal.", value); |
| return; |
| } |
| List<ClassNode> classes = source.getAST().getClasses(); |
| for (ClassNode classNode : classes) { |
| if (classNode.isScriptBody()) { |
| changeBaseScriptType(parent, classNode, value.getType()); |
| } |
| } |
| } |
| |
| private void changeBaseScriptTypeFromClass(final ClassNode parent, final AnnotationNode node) { |
| // Expression value = node.getMember("value"); |
| // if (!(value instanceof ClassExpression)) { |
| // addError("Annotation " + MY_TYPE_NAME + " member 'value' should be a class literal.", value); |
| // return; |
| // } |
| changeBaseScriptType(parent, parent, parent.getSuperClass()); |
| } |
| |
| private void changeBaseScriptTypeFromDeclaration(final DeclarationExpression de, final AnnotationNode node) { |
| if (de.isMultipleAssignmentDeclaration()) { |
| addError("Annotation " + MY_TYPE_NAME + " not supported with multiple assignment notation.", de); |
| return; |
| } |
| |
| if (!(de.getRightExpression() instanceof EmptyExpression)) { |
| addError("Annotation " + MY_TYPE_NAME + " not supported with variable assignment.", de); |
| return; |
| } |
| Expression value = node.getMember("value"); |
| if (value != null) { |
| addError("Annotation " + MY_TYPE_NAME + " cannot have member 'value' if used on a declaration.", value); |
| return; |
| } |
| |
| ClassNode cNode = de.getDeclaringClass(); |
| ClassNode baseScriptType = de.getVariableExpression().getType().getPlainNodeReference(); |
| de.setRightExpression(new VariableExpression("this")); |
| |
| changeBaseScriptType(de, cNode, baseScriptType); |
| } |
| |
| private void changeBaseScriptType(final AnnotatedNode parent, final ClassNode cNode, final ClassNode baseScriptType) { |
| if (!cNode.isScriptBody()) { |
| addError("Annotation " + MY_TYPE_NAME + " can only be used within a Script.", parent); |
| return; |
| } |
| |
| if (!baseScriptType.isScript()) { |
| addError("Declared type " + baseScriptType + " does not extend groovy.lang.Script class!", parent); |
| return; |
| } |
| |
| cNode.setSuperClass(baseScriptType); |
| |
| // Method in base script that will contain the script body code. |
| MethodNode runScriptMethod = ClassHelper.findSAM(baseScriptType); |
| |
| // If they want to use a name other than than "run", then make the change. |
| if (isCustomScriptBodyMethod(runScriptMethod)) { |
| MethodNode defaultMethod = cNode.getDeclaredMethod("run", Parameter.EMPTY_ARRAY); |
| // GROOVY-6706: Sometimes an NPE is thrown here. |
| // The reason is that our transform is getting called more than once sometimes. |
| if (defaultMethod != null) { |
| cNode.removeMethod(defaultMethod); |
| MethodNode methodNode = new MethodNode(runScriptMethod.getName(), runScriptMethod.getModifiers() & ~ACC_ABSTRACT |
| , runScriptMethod.getReturnType(), runScriptMethod.getParameters(), runScriptMethod.getExceptions() |
| , defaultMethod.getCode()); |
| // The AST node metadata has the flag that indicates that this method is a script body. |
| // It may also be carrying data for other AST transforms. |
| methodNode.copyNodeMetaData(defaultMethod); |
| addGeneratedMethod(cNode, methodNode); |
| } |
| } |
| |
| // If the new script base class does not have a contextual constructor (g.l.Binding), then we won't either. |
| // We have to do things this way (and rely on just default constructors) because the logic that generates |
| // the constructors for our script class have already run. |
| if (cNode.getSuperClass().getDeclaredConstructor(CONTEXT_CTOR_PARAMETERS) == null) { |
| ConstructorNode orphanedConstructor = cNode.getDeclaredConstructor(CONTEXT_CTOR_PARAMETERS); |
| cNode.removeConstructor(orphanedConstructor); |
| } |
| } |
| |
| private static boolean isCustomScriptBodyMethod(MethodNode node) { |
| return node != null |
| && !(node.getDeclaringClass().equals(ClassHelper.SCRIPT_TYPE) |
| && "run".equals(node.getName()) |
| && node.getParameters().length == 0); |
| } |
| } |