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/*
* Copyright (C) 2015-2021 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.eclipse.handlers;
import static lombok.core.handlers.HandlerUtil.handleExperimentalFlagUsage;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.ast.AbstractMethodDeclaration;
import org.eclipse.jdt.internal.compiler.ast.AllocationExpression;
import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.Block;
import org.eclipse.jdt.internal.compiler.ast.LocalDeclaration;
import org.eclipse.jdt.internal.compiler.ast.MessageSend;
import org.eclipse.jdt.internal.compiler.ast.MethodDeclaration;
import org.eclipse.jdt.internal.compiler.ast.SingleNameReference;
import org.eclipse.jdt.internal.compiler.ast.SingleTypeReference;
import org.eclipse.jdt.internal.compiler.ast.Statement;
import org.eclipse.jdt.internal.compiler.ast.SwitchStatement;
import org.eclipse.jdt.internal.compiler.ast.ThisReference;
import org.eclipse.jdt.internal.compiler.ast.TypeDeclaration;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
import lombok.ConfigurationKeys;
import lombok.core.AST.Kind;
import lombok.core.AnnotationValues;
import lombok.eclipse.EclipseAnnotationHandler;
import lombok.eclipse.EclipseNode;
import lombok.experimental.Helper;
import lombok.spi.Provides;
/**
* Handles the {@code lombok.Cleanup} annotation for eclipse.
*/
@Provides
public class HandleHelper extends EclipseAnnotationHandler<Helper> {
private Statement[] getStatementsFromAstNode(ASTNode node) {
if (node instanceof Block) return ((Block) node).statements;
if (node instanceof AbstractMethodDeclaration) return ((AbstractMethodDeclaration) node).statements;
if (node instanceof SwitchStatement) return ((SwitchStatement) node).statements;
return null;
}
private void setStatementsOfAstNode(ASTNode node, Statement[] statements) {
if (node instanceof Block) ((Block) node).statements = statements;
else if (node instanceof AbstractMethodDeclaration) ((AbstractMethodDeclaration) node).statements = statements;
else if (node instanceof SwitchStatement) ((SwitchStatement) node).statements = statements;
else throw new IllegalArgumentException("Can't set statements on node type: " + node.getClass());
}
@Override public void handle(AnnotationValues<Helper> annotation, Annotation ast, EclipseNode annotationNode) {
handleExperimentalFlagUsage(annotationNode, ConfigurationKeys.HELPER_FLAG_USAGE, "@Helper");
EclipseNode annotatedType = annotationNode.up();
EclipseNode containingBlock = annotatedType == null ? null : annotatedType.directUp();
Statement[] origStatements = getStatementsFromAstNode(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;
}
TypeDeclaration annotatedType_ = (TypeDeclaration) annotatedType.get();
int indexOfType = -1;
for (int i = 0; i < origStatements.length; i++) {
if (origStatements[i] == annotatedType_) {
indexOfType = i;
break;
}
}
final List<String> knownMethodNames = new ArrayList<String>();
for (AbstractMethodDeclaration methodOfHelper : annotatedType_.methods) {
if (!(methodOfHelper instanceof MethodDeclaration)) continue;
char[] name = methodOfHelper.selector;
if (name != null && name.length > 0 && name[0] != '<') knownMethodNames.add(new String(name));
}
Collections.sort(knownMethodNames);
final String[] knownMethodNames_ = knownMethodNames.toArray(new String[0]);
final char[] helperName = new char[annotatedType_.name.length + 1];
final boolean[] helperUsed = new boolean[1];
helperName[0] = '$';
System.arraycopy(annotatedType_.name, 0, helperName, 1, helperName.length - 1);
ASTVisitor visitor = new ASTVisitor() {
@Override public boolean visit(MessageSend messageSend, BlockScope scope) {
if (messageSend.receiver instanceof ThisReference) {
if ((((ThisReference) messageSend.receiver).bits & ASTNode.IsImplicitThis) == 0) return true;
} else if (messageSend.receiver != null) return true;
char[] name = messageSend.selector;
if (name == null || name.length == 0 || name[0] == '<') return true;
String n = new String(name);
if (Arrays.binarySearch(knownMethodNames_, n) < 0) return true;
messageSend.receiver = new SingleNameReference(helperName, messageSend.nameSourcePosition);
helperUsed[0] = true;
return true;
}
};
for (int i = indexOfType + 1; i < origStatements.length; i++) {
origStatements[i].traverse(visitor, null);
}
if (!helperUsed[0]) {
annotationNode.addWarning("No methods of this helper class are ever used.");
return;
}
Statement[] newStatements = new Statement[origStatements.length + 1];
System.arraycopy(origStatements, 0, newStatements, 0, indexOfType + 1);
System.arraycopy(origStatements, indexOfType + 1, newStatements, indexOfType + 2, origStatements.length - indexOfType - 1);
LocalDeclaration decl = new LocalDeclaration(helperName, 0, 0);
decl.modifiers |= ClassFileConstants.AccFinal;
AllocationExpression alloc = new AllocationExpression();
alloc.type = new SingleTypeReference(annotatedType_.name, 0L);
decl.initialization = alloc;
decl.type = new SingleTypeReference(annotatedType_.name, 0L);
SetGeneratedByVisitor sgbvVisitor = new SetGeneratedByVisitor(annotationNode.get());
decl.traverse(sgbvVisitor, null);
newStatements[indexOfType + 1] = decl;
setStatementsOfAstNode(containingBlock.get(), newStatements);
}
}
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