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/jEdit/tags/jedit-4-0-pre3/bsh/BSHLHSPrimaryExpression.java

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Java | 82 lines | 26 code | 8 blank | 48 comment | 3 complexity | cb86a22d99308c281f5ae5f0d748b92e MD5 | raw file
 1/*****************************************************************************
 2 *                                                                           *
 3 *  This file is part of the BeanShell Java Scripting distribution.          *
 4 *  Documentation and updates may be found at http://www.beanshell.org/      *
 5 *                                                                           *
 6 *  Sun Public License Notice:                                               *
 7 *                                                                           *
 8 *  The contents of this file are subject to the Sun Public License Version  *
 9 *  1.0 (the "License"); you may not use this file except in compliance with *
10 *  the License. A copy of the License is available at http://www.sun.com    * 
11 *                                                                           *
12 *  The Original Code is BeanShell. The Initial Developer of the Original    *
13 *  Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright     *
14 *  (C) 2000.  All Rights Reserved.                                          *
15 *                                                                           *
16 *  GNU Public License Notice:                                               *
17 *                                                                           *
18 *  Alternatively, the contents of this file may be used under the terms of  *
19 *  the GNU Lesser General Public License (the "LGPL"), in which case the    *
20 *  provisions of LGPL are applicable instead of those above. If you wish to *
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23 *  indicate your decision by deleting the provisions above and replace      *
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25 *  do not delete the provisions above, a recipient may use your version of  *
26 *  this file under either the SPL or the LGPL.                              *
27 *                                                                           *
28 *  Patrick Niemeyer (pat@pat.net)                                           *
29 *  Author of Learning Java, O'Reilly & Associates                           *
30 *  http://www.pat.net/~pat/                                                 *
31 *                                                                           *
32 *****************************************************************************/
33
34
35package bsh;
36
37class BSHLHSPrimaryExpression extends SimpleNode
38{
39	BSHLHSPrimaryExpression(int id) { super(id); }
40
41	public LHS toLHS(CallStack callstack, Interpreter interpreter) 
42		throws EvalError
43	{
44		/*
45			Get the prefix, which may be either an ambiguous name or a
46			method invocation.  
47
48			The method invocation bit here is somewhat of a hack to handle 
49			the fact that we have moved prefix method invocation into the 
50			PrimaryPrefix in order to get it to always produce an object type.
51
52			This is too complicated.
53		*/
54		int childNum = 0;
55		SimpleNode prefixNode = (SimpleNode)jjtGetChild(childNum++);
56		Object prefixValue = null;
57		LHS lhs = null;
58		if ( prefixNode instanceof BSHAmbiguousName )   {
59			lhs = ((BSHAmbiguousName)prefixNode).toLHS( callstack, interpreter);
60//System.err.println("lhs is ambig name ("+prefixNode+")= "+lhs);
61		} else
62			// Currently the only case is for BSHMethodInvocation
63			prefixValue = 
64				((SimpleNode)prefixNode).eval( callstack, interpreter);
65
66		// If the prefix is an object and not an LHS it requires at least
67		// one suffix to make an LHS
68		// Currently the only case is for BSHMethodInvocation
69		if ( prefixValue != null )
70			lhs = ((BSHLHSPrimarySuffix)jjtGetChild(childNum++)).doLHSSuffix(
71				prefixValue, callstack, interpreter);
72
73		// Apply the suffixes
74		int numChildren = jjtGetNumChildren(); 
75		while( childNum<numChildren ) 
76			lhs = ((BSHLHSPrimarySuffix)jjtGetChild(childNum++)).doLHSSuffix(
77				lhs.getValue(), callstack, interpreter);
78
79		return lhs;
80	}
81}
82