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/*
* Copyright (C) 2015-2016 The Project Lombok Authors.
*
* 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.handlers;
import static lombok.core.handlers.HandlerUtil.*;
import static lombok.javac.handlers.JavacHandlerUtil.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import org.mangosdk.spi.ProviderFor;
import com.sun.source.tree.MethodInvocationTree;
import com.sun.source.tree.TreeVisitor;
import com.sun.source.util.TreeScanner;
import com.sun.tools.javac.code.Flags;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.JCAnnotation;
import com.sun.tools.javac.tree.JCTree.JCBlock;
import com.sun.tools.javac.tree.JCTree.JCCase;
import com.sun.tools.javac.tree.JCTree.JCClassDecl;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCIdent;
import com.sun.tools.javac.tree.JCTree.JCMethodInvocation;
import com.sun.tools.javac.tree.JCTree.JCStatement;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
import com.sun.tools.javac.util.List;
import com.sun.tools.javac.util.ListBuffer;
import com.sun.tools.javac.util.Name;
import lombok.ConfigurationKeys;
import lombok.core.AST.Kind;
import lombok.core.AnnotationValues;
import lombok.experimental.Helper;
import lombok.javac.JavacAnnotationHandler;
import lombok.javac.JavacNode;
import lombok.javac.JavacTreeMaker;
@ProviderFor(JavacAnnotationHandler.class)
public class HandleHelper extends JavacAnnotationHandler<Helper> {
private List<JCStatement> getStatementsFromJcNode(JCTree tree) {
if (tree instanceof JCBlock) return ((JCBlock) tree).stats;
if (tree instanceof JCCase) return ((JCCase) tree).stats;
return null;
}
private void setStatementsOfJcNode(JCTree tree, List<JCStatement> statements) {
if (tree instanceof JCBlock) ((JCBlock) tree).stats = statements;
else if (tree instanceof JCCase) ((JCCase) tree).stats = statements;
else throw new IllegalArgumentException("Can't set statements on node type: " + tree.getClass());
}
@Override public void handle(AnnotationValues<Helper> annotation, JCAnnotation ast, JavacNode annotationNode) {
handleExperimentalFlagUsage(annotationNode, ConfigurationKeys.HELPER_FLAG_USAGE, "@Helper");
deleteAnnotationIfNeccessary(annotationNode, Helper.class);
JavacNode annotatedType = annotationNode.up();
JavacNode containingBlock = annotatedType == null ? null : annotatedType.directUp();
List<JCStatement> origStatements = getStatementsFromJcNode(containingBlock == null ? null : containingBlock.get());
if (annotatedType == null || annotatedType.getKind() != Kind.TYPE || origStatements == null) {
annotationNode.addError("@Helper is legal only on method-local classes.");
return;
}
JCClassDecl annotatedType_ = (JCClassDecl) annotatedType.get();
Iterator<JCStatement> it = origStatements.iterator();
while (it.hasNext()) {
if (it.next() == annotatedType_) {
break;
}
}
java.util.List<String> knownMethodNames = new ArrayList<String>();
for (JavacNode ch : annotatedType.down()) {
if (ch.getKind() != Kind.METHOD) continue;
String n = ch.getName();
if (n == null || n.isEmpty() || n.charAt(0) == '<') continue;
knownMethodNames.add(n);
}
Collections.sort(knownMethodNames);
final String[] knownMethodNames_ = knownMethodNames.toArray(new String[knownMethodNames.size()]);
final Name helperName = annotationNode.toName("$" + annotatedType_.name);
final boolean[] helperUsed = new boolean[1];
final JavacTreeMaker maker = annotationNode.getTreeMaker();
TreeVisitor<Void, Void> visitor = new TreeScanner<Void, Void>() {
@Override public Void visitMethodInvocation(MethodInvocationTree node, Void p) {
JCMethodInvocation jcmi = (JCMethodInvocation) node;
apply(jcmi);
return super.visitMethodInvocation(node, p);
}
private void apply(JCMethodInvocation jcmi) {
if (!(jcmi.meth instanceof JCIdent)) return;
JCIdent jci = (JCIdent) jcmi.meth;
if (Arrays.binarySearch(knownMethodNames_, jci.name.toString()) < 0) return;
jcmi.meth = maker.Select(maker.Ident(helperName), jci.name);
helperUsed[0] = true;
}
};
while (it.hasNext()) {
JCStatement stat = it.next();
stat.accept(visitor, null);
}
if (!helperUsed[0]) {
annotationNode.addWarning("No methods of this helper class are ever used.");
return;
}
ListBuffer<JCStatement> newStatements = new ListBuffer<JCStatement>();
boolean mark = false;
for (JCStatement stat : origStatements) {
newStatements.append(stat);
if (mark || stat != annotatedType_) continue;
mark = true;
JCExpression init = maker.NewClass(null, List.<JCExpression>nil(), maker.Ident(annotatedType_.name), List.<JCExpression>nil(), null);
JCExpression varType = maker.Ident(annotatedType_.name);
JCVariableDecl decl = maker.VarDef(maker.Modifiers(Flags.FINAL), helperName, varType, init);
newStatements.append(decl);
}
setStatementsOfJcNode(containingBlock.get(), newStatements.toList());
}
}
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