1    /* 
2     * Copyright 2000-2005 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.lang.javascript.psi.util; 
17    
18   import com.intellij.lang.javascript.psi.*; 
19   import com.intellij.psi.PsiElement; 
20    
21   /** 
22    * @author max 
23    */ 
24   public class JSUtils { 
25     public static boolean isLHSExpression(JSExpression expr) { 
26       if (expr instanceof JSReferenceExpression) { 
27         final PsiElement resolved = ((JSReferenceExpression)expr).resolve(); 
28         // funcid = null sometimes used for gc-ing purposes? 
29         return resolved == null || resolved instanceof JSVariable || resolved instanceof JSFunction; 
30       } 
31    
32       if (expr instanceof JSParenthesizedExpression) { 
33         return isLHSExpression(((JSParenthesizedExpression)expr).getInnerExpression()); 
34       } 
35    
36       if (expr instanceof JSIndexedPropertyAccessExpression) { 
37         return true; 
38       } 
39    
40       if (expr instanceof JSCallExpression) { 
41         return true; 
42       } 
43    
44       if (expr instanceof JSNewExpression) { 
45         return true; 
46       } 
47    
48       return false; 
49     } 
50   } 
51