| /* |
| * Copyright 2003-2010 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 org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| class ArrayContentsAssignedVisitor extends JavaRecursiveElementVisitor { |
| |
| private boolean assigned = false; |
| private final PsiVariable variable; |
| |
| public ArrayContentsAssignedVisitor(@NotNull PsiVariable variable) { |
| this.variable = variable; |
| } |
| |
| @Override |
| public void visitAssignmentExpression( |
| @NotNull PsiAssignmentExpression assignment) { |
| if (assigned) { |
| return; |
| } |
| super.visitAssignmentExpression(assignment); |
| final PsiExpression lhs = assignment.getLExpression(); |
| final PsiExpression arrayExpression = getDeepArrayExpression(lhs); |
| if (!(arrayExpression instanceof PsiReferenceExpression)) { |
| return; |
| } |
| final PsiReferenceExpression referenceExpression = |
| (PsiReferenceExpression)arrayExpression; |
| final PsiElement referent = referenceExpression.resolve(); |
| if (referent == null) { |
| return; |
| } |
| if (referent.equals(variable)) { |
| assigned = true; |
| } |
| } |
| |
| @Override |
| public void visitPrefixExpression( |
| @NotNull PsiPrefixExpression expression) { |
| if (assigned) { |
| return; |
| } |
| super.visitPrefixExpression(expression); |
| final IElementType tokenType = expression.getOperationTokenType(); |
| if (!(tokenType.equals(JavaTokenType.PLUSPLUS) || |
| tokenType.equals(JavaTokenType.MINUSMINUS))) { |
| return; |
| } |
| final PsiExpression operand = expression.getOperand(); |
| final PsiExpression arrayExpression = getDeepArrayExpression(operand); |
| if (!(arrayExpression instanceof PsiReferenceExpression)) { |
| return; |
| } |
| final PsiReferenceExpression referenceExpression = |
| (PsiReferenceExpression)arrayExpression; |
| final PsiElement referent = referenceExpression.resolve(); |
| if (referent == null) { |
| return; |
| } |
| if (referent.equals(variable)) { |
| assigned = true; |
| } |
| } |
| |
| @Override |
| public void visitPostfixExpression( |
| @NotNull PsiPostfixExpression expression) { |
| if (assigned) { |
| 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 PsiExpression arrayExpression = getDeepArrayExpression(operand); |
| if (!(arrayExpression instanceof PsiReferenceExpression)) { |
| return; |
| } |
| final PsiReferenceExpression referenceExpression = |
| (PsiReferenceExpression)arrayExpression; |
| final PsiElement referent = referenceExpression.resolve(); |
| if (referent == null) { |
| return; |
| } |
| if (referent.equals(variable)) { |
| assigned = true; |
| } |
| } |
| |
| @Nullable |
| private static PsiExpression getDeepArrayExpression( |
| PsiExpression expression) { |
| if (!(expression instanceof PsiArrayAccessExpression)) { |
| return null; |
| } |
| PsiExpression arrayExpression = |
| ((PsiArrayAccessExpression)expression).getArrayExpression(); |
| while (arrayExpression instanceof PsiArrayAccessExpression) { |
| final PsiArrayAccessExpression arrayAccessExpression = |
| (PsiArrayAccessExpression)arrayExpression; |
| arrayExpression = arrayAccessExpression.getArrayExpression(); |
| } |
| return arrayExpression; |
| } |
| |
| public boolean isAssigned() { |
| return assigned; |
| } |
| } |