| /* |
| * Copyright 2000-2014 JetBrains s.r.o. |
| * |
| * 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.ig.assignment; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.tree.IElementType; |
| import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import com.siyeh.ig.InspectionGadgetsFix; |
| import com.siyeh.ig.fixes.ExtractParameterAsLocalVariableFix; |
| import com.siyeh.ig.psiutils.ParenthesesUtils; |
| import com.siyeh.ig.psiutils.VariableAccessUtils; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * @author Bas Leijdekkers |
| */ |
| public abstract class BaseAssignmentToParameterInspection extends BaseInspection { |
| |
| @SuppressWarnings({"PublicField"}) |
| public boolean ignoreTransformationOfOriginalParameter = false; |
| |
| @Override |
| protected InspectionGadgetsFix buildFix(Object... infos) { |
| return new ExtractParameterAsLocalVariableFix(); |
| } |
| |
| protected abstract boolean isCorrectScope(PsiElement declarationScope); |
| |
| @Override |
| public final BaseInspectionVisitor buildVisitor() { |
| return new AssignmentToParameterVisitor(); |
| } |
| |
| private class AssignmentToParameterVisitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitAssignmentExpression(@NotNull PsiAssignmentExpression expression) { |
| super.visitAssignmentExpression(expression); |
| final PsiExpression lhs = expression.getLExpression(); |
| final PsiParameter parameter = getParameter(lhs); |
| if (parameter == null) { |
| return; |
| } |
| if (ignoreTransformationOfOriginalParameter) { |
| final PsiExpression rhs = expression.getRExpression(); |
| if (rhs != null && VariableAccessUtils.variableIsUsed(parameter, rhs)) { |
| return; |
| } |
| final IElementType tokenType = |
| expression.getOperationTokenType(); |
| if (tokenType == JavaTokenType.PLUSEQ || |
| tokenType == JavaTokenType.MINUSEQ || |
| tokenType == JavaTokenType.ASTERISKEQ || |
| tokenType == JavaTokenType.DIVEQ || |
| tokenType == JavaTokenType.ANDEQ || |
| tokenType == JavaTokenType.OREQ || |
| tokenType == JavaTokenType.XOREQ || |
| tokenType == JavaTokenType.PERCEQ || |
| tokenType == JavaTokenType.LTLTEQ || |
| tokenType == JavaTokenType.GTGTEQ || |
| tokenType == JavaTokenType.GTGTGTEQ) { |
| return; |
| } |
| } |
| registerError(lhs); |
| } |
| |
| @Override |
| public void visitPrefixExpression(@NotNull PsiPrefixExpression expression) { |
| if (ignoreTransformationOfOriginalParameter) { |
| return; |
| } |
| super.visitPrefixExpression(expression); |
| final IElementType tokenType = expression.getOperationTokenType(); |
| if (!tokenType.equals(JavaTokenType.PLUSPLUS) && !tokenType.equals(JavaTokenType.MINUSMINUS)) { |
| return; |
| } |
| final PsiExpression operand = expression.getOperand(); |
| if (operand == null) { |
| return; |
| } |
| final PsiParameter parameter = getParameter(operand); |
| if (parameter == null) { |
| return; |
| } |
| registerError(operand); |
| } |
| |
| @Override |
| public void visitPostfixExpression(@NotNull PsiPostfixExpression expression) { |
| if (ignoreTransformationOfOriginalParameter) { |
| return; |
| } |
| super.visitPostfixExpression(expression); |
| final IElementType tokenType = expression.getOperationTokenType(); |
| if (!tokenType.equals(JavaTokenType.PLUSPLUS) && !tokenType.equals(JavaTokenType.MINUSMINUS)) { |
| return; |
| } |
| final PsiExpression operand = expression.getOperand(); |
| final PsiParameter parameter = getParameter(operand); |
| if (parameter == null) { |
| return; |
| } |
| registerError(operand); |
| } |
| |
| @Nullable |
| private PsiParameter getParameter(PsiExpression expression) { |
| expression = ParenthesesUtils.stripParentheses(expression); |
| if (!(expression instanceof PsiReferenceExpression)) { |
| return null; |
| } |
| final PsiReferenceExpression referenceExpression = (PsiReferenceExpression)expression; |
| final PsiElement variable = referenceExpression.resolve(); |
| if (!(variable instanceof PsiParameter)) { |
| return null; |
| } |
| final PsiParameter parameter = (PsiParameter)variable; |
| final PsiElement declarationScope = parameter.getDeclarationScope(); |
| if (!isCorrectScope(declarationScope)) { |
| return null; |
| } |
| return parameter; |
| } |
| } |
| } |