| /******************************************************************************* |
| * Copyright (c) 2020 Fabrice TIERCELIN and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Fabrice TIERCELIN - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.ui.fix; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IProgressMonitor; |
| |
| import org.eclipse.text.edits.TextEditGroup; |
| |
| import org.eclipse.jdt.core.ICompilationUnit; |
| import org.eclipse.jdt.core.dom.AST; |
| import org.eclipse.jdt.core.dom.ASTVisitor; |
| import org.eclipse.jdt.core.dom.Block; |
| import org.eclipse.jdt.core.dom.CompilationUnit; |
| import org.eclipse.jdt.core.dom.IfStatement; |
| import org.eclipse.jdt.core.dom.InfixExpression; |
| import org.eclipse.jdt.core.dom.rewrite.ASTRewrite; |
| import org.eclipse.jdt.core.refactoring.CompilationUnitChange; |
| |
| import org.eclipse.jdt.internal.corext.dom.ASTNodeFactory; |
| import org.eclipse.jdt.internal.corext.dom.ASTNodes; |
| import org.eclipse.jdt.internal.corext.fix.CleanUpConstants; |
| import org.eclipse.jdt.internal.corext.fix.CompilationUnitRewriteOperationsFix; |
| import org.eclipse.jdt.internal.corext.fix.CompilationUnitRewriteOperationsFix.CompilationUnitRewriteOperation; |
| import org.eclipse.jdt.internal.corext.fix.LinkedProposalModel; |
| import org.eclipse.jdt.internal.corext.refactoring.structure.CompilationUnitRewrite; |
| |
| import org.eclipse.jdt.ui.cleanup.CleanUpRequirements; |
| import org.eclipse.jdt.ui.cleanup.ICleanUpFix; |
| import org.eclipse.jdt.ui.text.java.IProblemLocation; |
| |
| /** |
| * A fix that raises embedded if into parent if. |
| */ |
| public class EmbeddedIfCleanUp extends AbstractMultiFix implements ICleanUpFix { |
| public EmbeddedIfCleanUp() { |
| this(Collections.emptyMap()); |
| } |
| |
| public EmbeddedIfCleanUp(Map<String, String> options) { |
| super(options); |
| } |
| |
| @Override |
| public CleanUpRequirements getRequirements() { |
| boolean requireAST= isEnabled(CleanUpConstants.RAISE_EMBEDDED_IF); |
| return new CleanUpRequirements(requireAST, false, false, null); |
| } |
| |
| @Override |
| public String[] getStepDescriptions() { |
| if (isEnabled(CleanUpConstants.RAISE_EMBEDDED_IF)) { |
| return new String[] { MultiFixMessages.EmbeddedIfCleanup_description }; |
| } |
| |
| return new String[0]; |
| } |
| |
| @Override |
| public String getPreview() { |
| if (isEnabled(CleanUpConstants.RAISE_EMBEDDED_IF)) { |
| return "" //$NON-NLS-1$ |
| + "if (isActive && isValid) {\n" //$NON-NLS-1$ |
| + " int i = 0;\n" //$NON-NLS-1$ |
| + "}\n\n\n"; //$NON-NLS-1$ |
| } |
| |
| return "" //$NON-NLS-1$ |
| + "if (isActive) {\n" //$NON-NLS-1$ |
| + " if (isValid) {\n" //$NON-NLS-1$ |
| + " int i = 0;\n" //$NON-NLS-1$ |
| + " }\n" //$NON-NLS-1$ |
| + "}\n"; //$NON-NLS-1$ |
| } |
| |
| @Override |
| protected ICleanUpFix createFix(CompilationUnit unit) throws CoreException { |
| if (!isEnabled(CleanUpConstants.RAISE_EMBEDDED_IF)) { |
| return null; |
| } |
| |
| final List<CompilationUnitRewriteOperation> rewriteOperations= new ArrayList<>(); |
| |
| unit.accept(new ASTVisitor() { |
| @Override |
| public boolean visit(final IfStatement visited) { |
| if (visited.getElseStatement() == null) { |
| IfStatement innerIf= ASTNodes.as(visited.getThenStatement(), IfStatement.class); |
| |
| if (innerIf != null |
| && innerIf.getElseStatement() == null |
| && ASTNodes.getNbOperands(visited.getExpression()) + ASTNodes.getNbOperands(innerIf.getExpression()) < ASTNodes.EXCESSIVE_OPERAND_NUMBER) { |
| // The parsing crashes when there are two embedded lone ifs with an end of line comment at the right of the statement |
| // So we disable the rule on double lone if |
| if (!(visited.getThenStatement() instanceof Block) |
| && !(innerIf.getThenStatement() instanceof Block)) { |
| return true; |
| } |
| |
| rewriteOperations.add(new EmbeddedIfOperation(visited, innerIf)); |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| }); |
| |
| if (rewriteOperations.isEmpty()) { |
| return null; |
| } |
| |
| return new CompilationUnitRewriteOperationsFix(MultiFixMessages.EmbeddedIfCleanup_description, unit, |
| rewriteOperations.toArray(new CompilationUnitRewriteOperation[0])); |
| } |
| |
| @Override |
| public CompilationUnitChange createChange(IProgressMonitor progressMonitor) throws CoreException { |
| return null; |
| } |
| |
| @Override |
| public boolean canFix(final ICompilationUnit compilationUnit, final IProblemLocation problem) { |
| return false; |
| } |
| |
| @Override |
| protected ICleanUpFix createFix(final CompilationUnit unit, final IProblemLocation[] problems) throws CoreException { |
| return null; |
| } |
| |
| private static class EmbeddedIfOperation extends CompilationUnitRewriteOperation { |
| private final IfStatement visited; |
| private final IfStatement innerIf; |
| |
| public EmbeddedIfOperation(final IfStatement visited, final IfStatement innerIf) { |
| this.visited= visited; |
| this.innerIf= innerIf; |
| } |
| |
| @Override |
| public void rewriteAST(final CompilationUnitRewrite cuRewrite, final LinkedProposalModel linkedModel) throws CoreException { |
| ASTRewrite rewrite= cuRewrite.getASTRewrite(); |
| AST ast= cuRewrite.getRoot().getAST(); |
| TextEditGroup group= createTextEditGroup(MultiFixMessages.EmbeddedIfCleanup_description, cuRewrite); |
| |
| InfixExpression infixExpression= ast.newInfixExpression(); |
| infixExpression.setLeftOperand(ASTNodeFactory.parenthesizeIfNeeded(ast, ASTNodes.createMoveTarget(rewrite, visited.getExpression()))); |
| infixExpression.setOperator(InfixExpression.Operator.CONDITIONAL_AND); |
| infixExpression.setRightOperand(ASTNodeFactory.parenthesizeIfNeeded(ast, ASTNodes.createMoveTarget(rewrite, innerIf.getExpression()))); |
| ASTNodes.replaceButKeepComment(rewrite, innerIf.getExpression(), infixExpression, group); |
| ASTNodes.replaceButKeepComment(rewrite, visited, ASTNodes.createMoveTarget(rewrite, innerIf), group); |
| } |
| } |
| } |