| /* |
| * Copyright 2003-2008 Dave Griffith, Bas Leijdekkers |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.siyeh.ipp.increment; |
| |
| import com.intellij.openapi.project.Project; |
| import com.intellij.psi.*; |
| import com.intellij.psi.codeStyle.JavaCodeStyleManager; |
| import com.intellij.psi.search.LocalSearchScope; |
| import com.intellij.psi.search.SearchScope; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.intellij.util.IncorrectOperationException; |
| import com.siyeh.IntentionPowerPackBundle; |
| import com.siyeh.ig.PsiReplacementUtil; |
| import com.siyeh.ipp.base.MutablyNamedIntention; |
| import com.siyeh.ipp.base.PsiElementPredicate; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| public class ExtractIncrementIntention extends MutablyNamedIntention { |
| |
| @Override |
| public String getTextForElement(PsiElement element) { |
| final PsiJavaToken sign; |
| if (element instanceof PsiPostfixExpression) { |
| sign = ((PsiPostfixExpression)element).getOperationSign(); |
| } |
| else { |
| sign = ((PsiPrefixExpression)element).getOperationSign(); |
| } |
| final String operator = sign.getText(); |
| return IntentionPowerPackBundle.message( |
| "extract.increment.intention.name", operator); |
| } |
| |
| @Override |
| @NotNull |
| public PsiElementPredicate getElementPredicate() { |
| return new ExtractIncrementPredicate(); |
| } |
| |
| @Override |
| public void processIntention(@NotNull PsiElement element) |
| throws IncorrectOperationException { |
| final PsiExpression operand; |
| if (element instanceof PsiPostfixExpression) { |
| final PsiPostfixExpression postfixExpression = |
| (PsiPostfixExpression)element; |
| operand = postfixExpression.getOperand(); |
| } |
| else { |
| final PsiPrefixExpression prefixExpression = |
| (PsiPrefixExpression)element; |
| operand = prefixExpression.getOperand(); |
| } |
| if (operand == null) { |
| return; |
| } |
| final PsiStatement statement = |
| PsiTreeUtil.getParentOfType(element, PsiStatement.class); |
| if (statement == null) { |
| return; |
| } |
| final PsiElement parent = statement.getParent(); |
| if (parent == null) { |
| return; |
| } |
| final Project project = element.getProject(); |
| final PsiElementFactory factory = |
| JavaPsiFacade.getInstance(project).getElementFactory(); |
| final String newStatementText = element.getText() + ';'; |
| final String operandText = operand.getText(); |
| if (parent instanceof PsiIfStatement || |
| parent instanceof PsiLoopStatement) { |
| // need to add braces because |
| // in/decrement is inside braceless control statement body |
| final StringBuilder text = new StringBuilder(); |
| text.append('{'); |
| final String elementText = |
| getElementText(statement, element, operandText); |
| if (element instanceof PsiPostfixExpression) { |
| text.append(elementText); |
| text.append(newStatementText); |
| } |
| else { |
| text.append(newStatementText); |
| text.append(elementText); |
| } |
| text.append('}'); |
| final PsiCodeBlock codeBlock = |
| factory.createCodeBlockFromText(text.toString(), parent); |
| statement.replace(codeBlock); |
| return; |
| } |
| final PsiStatement newStatement = |
| factory.createStatementFromText(newStatementText, element); |
| if (statement instanceof PsiReturnStatement) { |
| if (element instanceof PsiPostfixExpression) { |
| // special handling of postfix expression in return statement |
| final PsiReturnStatement returnStatement = |
| (PsiReturnStatement)statement; |
| final PsiExpression returnValue = |
| returnStatement.getReturnValue(); |
| if (returnValue == null) { |
| return; |
| } |
| final JavaCodeStyleManager javaCodeStyleManager = |
| JavaCodeStyleManager.getInstance(project); |
| final String variableName = |
| javaCodeStyleManager.suggestUniqueVariableName( |
| "result", returnValue, true); |
| final PsiType type = returnValue.getType(); |
| if (type == null) { |
| return; |
| } |
| final String newReturnValueText = getElementText( |
| returnValue, element, operandText); |
| final String declarationStatementText = |
| type.getCanonicalText() + ' ' + variableName + |
| '=' + newReturnValueText + ';'; |
| final PsiStatement declarationStatement = |
| factory.createStatementFromText(declarationStatementText, |
| returnStatement); |
| parent.addBefore(declarationStatement, statement); |
| parent.addBefore(newStatement, statement); |
| final PsiStatement newReturnStatement = |
| factory.createStatementFromText( |
| "return " + variableName + ';', |
| returnStatement); |
| returnStatement.replace(newReturnStatement); |
| return; |
| } |
| else { |
| parent.addBefore(newStatement, statement); |
| } |
| } |
| else if (statement instanceof PsiThrowStatement) { |
| if (element instanceof PsiPostfixExpression) { |
| // special handling of postfix expression in throw statement |
| final PsiThrowStatement returnStatement = |
| (PsiThrowStatement)statement; |
| final PsiExpression exception = |
| returnStatement.getException(); |
| if (exception == null) { |
| return; |
| } |
| final JavaCodeStyleManager javaCodeStyleManager = |
| JavaCodeStyleManager.getInstance(project); |
| final String variableName = |
| javaCodeStyleManager.suggestUniqueVariableName( |
| "e", exception, true); |
| final PsiType type = exception.getType(); |
| if (type == null) { |
| return; |
| } |
| final String newReturnValueText = getElementText( |
| exception, element, operandText); |
| final String declarationStatementText = |
| type.getCanonicalText() + ' ' + variableName + |
| '=' + newReturnValueText + ';'; |
| final PsiStatement declarationStatement = |
| factory.createStatementFromText(declarationStatementText, |
| returnStatement); |
| parent.addBefore(declarationStatement, statement); |
| parent.addBefore(newStatement, statement); |
| final PsiStatement newReturnStatement = |
| factory.createStatementFromText( |
| "throw " + variableName + ';', |
| returnStatement); |
| returnStatement.replace(newReturnStatement); |
| return; |
| } |
| else { |
| parent.addBefore(newStatement, statement); |
| } |
| } |
| else if (!(statement instanceof PsiForStatement)) { |
| if (element instanceof PsiPostfixExpression) { |
| parent.addAfter(newStatement, statement); |
| } |
| else { |
| parent.addBefore(newStatement, statement); |
| } |
| } |
| else if (operand instanceof PsiReferenceExpression) { |
| final PsiReferenceExpression referenceExpression = |
| (PsiReferenceExpression)operand; |
| final PsiElement target = referenceExpression.resolve(); |
| if (target != null) { |
| final SearchScope useScope = target.getUseScope(); |
| if (!new LocalSearchScope(statement).equals(useScope)) { |
| if (element instanceof PsiPostfixExpression) { |
| parent.addAfter(newStatement, statement); |
| } |
| else { |
| parent.addBefore(newStatement, statement); |
| } |
| } |
| } |
| } |
| if (statement instanceof PsiLoopStatement) { |
| // in/decrement inside loop statement condition |
| final PsiLoopStatement loopStatement = (PsiLoopStatement)statement; |
| final PsiStatement body = loopStatement.getBody(); |
| if (body instanceof PsiBlockStatement) { |
| final PsiBlockStatement blockStatement = |
| (PsiBlockStatement)body; |
| final PsiCodeBlock codeBlock = blockStatement.getCodeBlock(); |
| if (element instanceof PsiPostfixExpression) { |
| final PsiElement firstElement = |
| codeBlock.getFirstBodyElement(); |
| codeBlock.addBefore(newStatement, firstElement); |
| } |
| else { |
| codeBlock.add(newStatement); |
| } |
| } |
| else { |
| final StringBuilder blockText = new StringBuilder(); |
| blockText.append('{'); |
| if (element instanceof PsiPostfixExpression) { |
| blockText.append(newStatementText); |
| if (body != null) { |
| blockText.append(body.getText()); |
| } |
| } |
| else { |
| if (body != null) { |
| blockText.append(body.getText()); |
| } |
| blockText.append(newStatementText); |
| } |
| blockText.append('}'); |
| final PsiStatement blockStatement = |
| factory.createStatementFromText(blockText.toString(), |
| statement); |
| if (body == null) { |
| loopStatement.add(blockStatement); |
| } |
| else { |
| body.replace(blockStatement); |
| } |
| } |
| } |
| PsiReplacementUtil.replaceExpression((PsiExpression)element, operandText); |
| } |
| |
| private static String getElementText(@NotNull PsiElement element, |
| @Nullable PsiElement elementToReplace, |
| @Nullable String replacement) { |
| final StringBuilder out = new StringBuilder(); |
| getElementText(element, elementToReplace, replacement, out); |
| return out.toString(); |
| } |
| |
| private static void getElementText( |
| @NotNull PsiElement element, |
| @Nullable PsiElement elementToReplace, |
| @Nullable String replacement, |
| @NotNull StringBuilder out) { |
| if (element.equals(elementToReplace)) { |
| out.append(replacement); |
| return; |
| } |
| final PsiElement[] children = element.getChildren(); |
| if (children.length == 0) { |
| out.append(element.getText()); |
| return; |
| } |
| for (PsiElement child : children) { |
| getElementText(child, elementToReplace, replacement, out); |
| } |
| } |
| } |
