java/java-impl/src/com/intellij/psi/filters/element/ExcludeSillyAssignment.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.psi.filters.element;
  17
  18 import com.intellij.psi.*;
  19 import com.intellij.psi.filters.ElementFilter;
  20
  21 /**
  22  * Created by IntelliJ IDEA.
  23  * User: ik
  24  * Date: 06.01.2004
  25  * Time: 17:59:58
  26  * To change this template use Options | File Templates.
  27  */
  28 public class ExcludeSillyAssignment implements ElementFilter {
  29   public boolean isAcceptable(Object element, PsiElement context) {
  30     if(!(element instanceof PsiElement)) return true;
  31
  32     PsiElement each = context;
  33     while (each != null && !(each instanceof PsiFile)) {
  34       if (each instanceof PsiExpressionList || each instanceof PsiPrefixExpression || each instanceof PsiBinaryExpression) {
  35         return true;
  36       }
  37
  38       if (each instanceof PsiAssignmentExpression) {
  39         final PsiExpression left = ((PsiAssignmentExpression)each).getLExpression();
  40         if (left instanceof PsiReferenceExpression) {
  41           final PsiReferenceExpression referenceExpression = (PsiReferenceExpression)left;
  42           if (referenceExpression.isQualified()) return true;
  43
  44           return !referenceExpression.isReferenceTo((PsiElement)element);
  45         }
  46         return true;
  47       }
  48
  49       each = each.getContext();
  50     }
  51
  52     return true;
  53   }
  54
  55   public boolean isClassAcceptable(Class hintClass) {
  56     return true;
  57   }
  58 }