| /******************************************************************************* |
| * Copyright (c) 2021 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.corext.fix; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.core.runtime.CoreException; |
| |
| import org.eclipse.text.edits.TextEditGroup; |
| |
| import org.eclipse.jdt.core.dom.AST; |
| import org.eclipse.jdt.core.dom.ASTNode; |
| 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.Expression; |
| import org.eclipse.jdt.core.dom.IfStatement; |
| import org.eclipse.jdt.core.dom.rewrite.ASTRewrite; |
| import org.eclipse.jdt.core.dom.rewrite.TargetSourceRangeComputer; |
| import org.eclipse.jdt.core.manipulation.ICleanUpFixCore; |
| |
| import org.eclipse.jdt.internal.corext.dom.ASTNodes; |
| import org.eclipse.jdt.internal.corext.refactoring.structure.CompilationUnitRewrite; |
| |
| import org.eclipse.jdt.internal.ui.fix.MultiFixMessages; |
| |
| public class PullOutIfFromIfElseFixCore extends CompilationUnitRewriteOperationsFixCore { |
| public static final class PullOutIfFromIfElseFinder extends ASTVisitor { |
| private List<CompilationUnitRewriteOperation> fResult; |
| |
| public PullOutIfFromIfElseFinder(List<CompilationUnitRewriteOperation> ops) { |
| fResult= ops; |
| } |
| |
| @Override |
| public boolean visit(final IfStatement visited) { |
| IfStatement thenInnerIfStatement= ASTNodes.as(visited.getThenStatement(), IfStatement.class); |
| IfStatement elseInnerIfStatement= ASTNodes.as(visited.getElseStatement(), IfStatement.class); |
| |
| if (thenInnerIfStatement != null |
| && elseInnerIfStatement != null |
| && thenInnerIfStatement.getElseStatement() == null |
| && elseInnerIfStatement.getElseStatement() == null |
| && ASTNodes.isPassive(visited.getExpression()) |
| && ASTNodes.isPassive(thenInnerIfStatement.getExpression()) |
| && ASTNodes.match(thenInnerIfStatement.getExpression(), elseInnerIfStatement.getExpression())) { |
| fResult.add(new PullOutIfFromIfElseOperation(visited, thenInnerIfStatement, elseInnerIfStatement)); |
| return false; |
| } |
| |
| return true; |
| } |
| } |
| |
| private static class PullOutIfFromIfElseOperation extends CompilationUnitRewriteOperation { |
| private final IfStatement visited; |
| private final IfStatement thenInnerIfStatement; |
| private final IfStatement elseInnerIfStatement; |
| |
| public PullOutIfFromIfElseOperation(final IfStatement visited, final IfStatement thenInnerIfStatement, final IfStatement elseInnerIfStatement) { |
| this.visited= visited; |
| this.thenInnerIfStatement= thenInnerIfStatement; |
| this.elseInnerIfStatement= elseInnerIfStatement; |
| } |
| |
| @Override |
| public void rewriteAST(final CompilationUnitRewrite cuRewrite, final LinkedProposalModelCore linkedModel) throws CoreException { |
| ASTRewrite rewrite= cuRewrite.getASTRewrite(); |
| AST ast= cuRewrite.getRoot().getAST(); |
| TextEditGroup group= createTextEditGroup(MultiFixMessages.PullOutIfFromIfElseCleanUp_description, cuRewrite); |
| rewrite.setTargetSourceRangeComputer(new TargetSourceRangeComputer() { |
| @Override |
| public SourceRange computeSourceRange(final ASTNode nodeWithComment) { |
| if (Boolean.TRUE.equals(nodeWithComment.getProperty(ASTNodes.UNTOUCH_COMMENT))) { |
| return new SourceRange(nodeWithComment.getStartPosition(), nodeWithComment.getLength()); |
| } |
| |
| return super.computeSourceRange(nodeWithComment); |
| } |
| }); |
| |
| Expression newCondition= ASTNodes.createMoveTarget(rewrite, ASTNodes.getUnparenthesedExpression(thenInnerIfStatement.getExpression())); |
| IfStatement newIfStatement= ast.newIfStatement(); |
| newIfStatement.setExpression(newCondition); |
| Block newBlock= ast.newBlock(); |
| newBlock.statements().add(ASTNodes.createMoveTarget(rewrite, visited)); |
| newIfStatement.setThenStatement(newBlock); |
| |
| ASTNodes.replaceButKeepComment(rewrite, visited, newIfStatement, group); |
| ASTNodes.replaceButKeepComment(rewrite, visited.getThenStatement(), ASTNodes.createMoveTarget(rewrite, thenInnerIfStatement.getThenStatement()), group); |
| ASTNodes.replaceButKeepComment(rewrite, visited.getElseStatement(), ASTNodes.createMoveTarget(rewrite, elseInnerIfStatement.getThenStatement()), group); |
| } |
| } |
| |
| public static ICleanUpFixCore createCleanUp(final CompilationUnit compilationUnit) { |
| List<CompilationUnitRewriteOperation> operations= new ArrayList<>(); |
| PullOutIfFromIfElseFinder finder= new PullOutIfFromIfElseFinder(operations); |
| compilationUnit.accept(finder); |
| |
| if (operations.isEmpty()) { |
| return null; |
| } |
| |
| CompilationUnitRewriteOperation[] ops= operations.toArray(new CompilationUnitRewriteOperation[0]); |
| return new PullOutIfFromIfElseFixCore(FixMessages.PullOutIfFromIfElseFix_description, compilationUnit, ops); |
| } |
| |
| protected PullOutIfFromIfElseFixCore(final String name, final CompilationUnit compilationUnit, final CompilationUnitRewriteOperation[] fixRewriteOperations) { |
| super(name, compilationUnit, fixRewriteOperations); |
| } |
| } |