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/*
* Copyright © 2009 Reinier Zwitserloot and Roel Spilker.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.javac.apt;
import java.util.ArrayList;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.Set;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.ProcessingEnvironment;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import javax.tools.Diagnostic.Kind;
import lombok.javac.HandlerLibrary;
import lombok.javac.JavacAST;
import lombok.javac.JavacASTAdapter;
import lombok.javac.JavacNode;
import com.sun.source.util.TreePath;
import com.sun.source.util.Trees;
import com.sun.tools.javac.processing.JavacProcessingEnvironment;
import com.sun.tools.javac.tree.JCTree.JCAnnotation;
import com.sun.tools.javac.tree.JCTree.JCClassDecl;
import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
/**
* This Annotation Processor is the standard injection mechanism for lombok-enabling the javac compiler.
*
* Due to lots of changes in the core javac code, as well as lombok's heavy usage of non-public API, this
* code only works for the javac v1.6 compiler; it definitely won't work for javac v1.5, and it probably
* won't work for javac v1.7 without modifications.
*
* To actually enable lombok in a javac compilation run, this class should be in the classpath when
* running javac; that's the only requirement.
*/
@SupportedAnnotationTypes("*")
@SupportedSourceVersion(SourceVersion.RELEASE_6)
public class Processor extends AbstractProcessor {
private ProcessingEnvironment rawProcessingEnv;
private JavacProcessingEnvironment processingEnv;
private HandlerLibrary handlers;
private Trees trees;
private String errorToShow;
/** {@inheritDoc} */
@Override public void init(ProcessingEnvironment procEnv) {
super.init(procEnv);
this.rawProcessingEnv = procEnv;
String className = procEnv.getClass().getName();
if (className.startsWith("org.eclipse.jdt.")) {
errorToShow = "You should not install lombok.jar as an annotation processor in eclipse. Instead, run lombok.jar as a java application and follow the instructions.";
procEnv.getMessager().printMessage(Kind.WARNING, errorToShow);
this.processingEnv = null;
} else if (!procEnv.getClass().getName().equals("com.sun.tools.javac.processing.JavacProcessingEnvironment")) {
procEnv.getMessager().printMessage(Kind.WARNING, "You aren't using a compiler based around javac v1.6, so lombok will not work properly.\n" +
"Your processor class is: " + className);
this.processingEnv = null;
this.errorToShow = null;
} else {
this.processingEnv = (JavacProcessingEnvironment) procEnv;
handlers = HandlerLibrary.load(procEnv.getMessager());
trees = Trees.instance(procEnv);
this.errorToShow = null;
}
}
/** {@inheritDoc} */
@Override public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
if (processingEnv == null) {
if (errorToShow != null) {
Set<? extends Element> rootElements = roundEnv.getRootElements();
if (!rootElements.isEmpty()) {
rawProcessingEnv.getMessager().printMessage(Kind.WARNING, errorToShow, rootElements.iterator().next());
errorToShow = null;
}
}
return false;
}
IdentityHashMap<JCCompilationUnit, Void> units = new IdentityHashMap<JCCompilationUnit, Void>();
for (Element element : roundEnv.getRootElements()) {
JCCompilationUnit unit = toUnit(element);
if (unit != null) units.put(unit, null);
}
List<JavacAST> asts = new ArrayList<JavacAST>();
for (JCCompilationUnit unit : units.keySet()) asts.add(
new JavacAST(trees, processingEnv.getMessager(), processingEnv.getContext(), unit));
handlers.skipPrintAST();
for (JavacAST ast : asts) {
ast.traverse(new AnnotationVisitor());
handlers.callASTVisitors(ast);
}
handlers.skipAllButPrintAST();
for (JavacAST ast : asts) {
ast.traverse(new AnnotationVisitor());
}
return false;
}
private class AnnotationVisitor extends JavacASTAdapter {
@Override public void visitAnnotationOnType(JCClassDecl type, JavacNode annotationNode, JCAnnotation annotation) {
if (annotationNode.isHandled()) return;
JCCompilationUnit top = (JCCompilationUnit) annotationNode.top().get();
boolean handled = handlers.handleAnnotation(top, annotationNode, annotation);
if (handled) annotationNode.setHandled();
}
@Override public void visitAnnotationOnField(JCVariableDecl field, JavacNode annotationNode, JCAnnotation annotation) {
if (annotationNode.isHandled()) return;
JCCompilationUnit top = (JCCompilationUnit) annotationNode.top().get();
boolean handled = handlers.handleAnnotation(top, annotationNode, annotation);
if (handled) annotationNode.setHandled();
}
@Override public void visitAnnotationOnMethod(JCMethodDecl method, JavacNode annotationNode, JCAnnotation annotation) {
if (annotationNode.isHandled()) return;
JCCompilationUnit top = (JCCompilationUnit) annotationNode.top().get();
boolean handled = handlers.handleAnnotation(top, annotationNode, annotation);
if (handled) annotationNode.setHandled();
}
@Override public void visitAnnotationOnMethodArgument(JCVariableDecl argument, JCMethodDecl method, JavacNode annotationNode, JCAnnotation annotation) {
if (annotationNode.isHandled()) return;
JCCompilationUnit top = (JCCompilationUnit) annotationNode.top().get();
boolean handled = handlers.handleAnnotation(top, annotationNode, annotation);
if (handled) annotationNode.setHandled();
}
@Override public void visitAnnotationOnLocal(JCVariableDecl local, JavacNode annotationNode, JCAnnotation annotation) {
if (annotationNode.isHandled()) return;
JCCompilationUnit top = (JCCompilationUnit) annotationNode.top().get();
boolean handled = handlers.handleAnnotation(top, annotationNode, annotation);
if (handled) annotationNode.setHandled();
}
}
private JCCompilationUnit toUnit(Element element) {
TreePath path = trees == null ? null : trees.getPath(element);
if (path == null) return null;
return (JCCompilationUnit) path.getCompilationUnit();
}
}
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