| /* |
| * Copyright 2003-2014 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.ig.psiutils; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.tree.IElementType; |
| import com.intellij.psi.util.TypeConversionUtil; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| |
| public class VariableAssignedVisitor extends JavaRecursiveElementWalkingVisitor { |
| |
| @NotNull private final Collection<PsiVariable> variables; |
| private final boolean recurseIntoClasses; |
| private final boolean checkUnaryExpressions; |
| private boolean assigned = false; |
| private PsiElement excludedElement = null; |
| |
| public VariableAssignedVisitor(@NotNull Collection<PsiVariable> variables, boolean recurseIntoClasses) { |
| this.variables = variables; |
| checkUnaryExpressions = true; |
| this.recurseIntoClasses = recurseIntoClasses; |
| } |
| |
| public VariableAssignedVisitor(@NotNull PsiVariable variable, boolean recurseIntoClasses) { |
| variables = Collections.singleton(variable); |
| final PsiType type = variable.getType(); |
| checkUnaryExpressions = TypeConversionUtil.isNumericType(type); |
| this.recurseIntoClasses = recurseIntoClasses; |
| } |
| |
| public VariableAssignedVisitor(@NotNull PsiVariable variable) { |
| this(variable, true); |
| } |
| |
| public void setExcludedElement(PsiElement excludedElement) { |
| this.excludedElement = excludedElement; |
| } |
| |
| @Override |
| public void visitElement(@NotNull PsiElement element) { |
| if (assigned || element == excludedElement) { |
| return; |
| } |
| super.visitElement(element); |
| } |
| |
| @Override |
| public void visitAssignmentExpression(@NotNull PsiAssignmentExpression assignment) { |
| if (assigned) { |
| return; |
| } |
| super.visitAssignmentExpression(assignment); |
| final PsiExpression lhs = assignment.getLExpression(); |
| for (PsiVariable variable : variables) { |
| if (VariableAccessUtils.evaluatesToVariable(lhs, variable)) { |
| assigned = true; |
| break; |
| } |
| } |
| } |
| |
| @Override |
| public void visitClass(PsiClass aClass) { |
| if (!recurseIntoClasses || assigned) { |
| return; |
| } |
| super.visitClass(aClass); |
| } |
| |
| @Override |
| public void visitPrefixExpression(@NotNull PsiPrefixExpression prefixExpression) { |
| if (assigned) { |
| return; |
| } |
| super.visitPrefixExpression(prefixExpression); |
| if (!checkUnaryExpressions) { |
| return; |
| } |
| final IElementType tokenType = prefixExpression.getOperationTokenType(); |
| if (!tokenType.equals(JavaTokenType.PLUSPLUS) && !tokenType.equals(JavaTokenType.MINUSMINUS)) { |
| return; |
| } |
| final PsiExpression operand = prefixExpression.getOperand(); |
| for (PsiVariable variable : variables) { |
| if (VariableAccessUtils.evaluatesToVariable(operand, variable)) { |
| assigned = true; |
| break; |
| } |
| } |
| } |
| |
| @Override |
| public void visitPostfixExpression(@NotNull PsiPostfixExpression postfixExpression) { |
| if (assigned) { |
| return; |
| } |
| super.visitPostfixExpression(postfixExpression); |
| if (!checkUnaryExpressions) { |
| return; |
| } |
| final IElementType tokenType = postfixExpression.getOperationTokenType(); |
| if (!tokenType.equals(JavaTokenType.PLUSPLUS) && !tokenType.equals(JavaTokenType.MINUSMINUS)) { |
| return; |
| } |
| final PsiExpression operand = postfixExpression.getOperand(); |
| for (PsiVariable variable : variables) { |
| if (VariableAccessUtils.evaluatesToVariable(operand, variable)) { |
| assigned = true; |
| break; |
| } |
| } |
| } |
| |
| public boolean isAssigned() { |
| return assigned; |
| } |
| } |