PageRenderTime 32ms CodeModel.GetById 27ms app.highlight 3ms RepoModel.GetById 1ms app.codeStats 0ms

/jEdit/tags/jedit-4-2-pre4/bsh/BSHLHSPrimaryExpression.java

#
Java | 98 lines | 39 code | 9 blank | 50 comment | 4 complexity | 015983ef770ace37afb87a6208e1b943 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 *
21 *  allow use of your version of this file only under the  terms of the LGPL *
22 *  and not to allow others to use your version of this file under the SPL,  *
23 *  indicate your decision by deleting the provisions above and replace      *
24 *  them with the notice and other provisions required by the LGPL.  If you  *
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	/**
42		Evaluate the expression to an object.
43	*/
44	public Object eval(CallStack callstack, Interpreter interpreter)  
45		throws EvalError
46	{
47		try {
48			return toLHS( callstack, interpreter ).getValue();
49		} catch ( UtilEvalError e ) {
50			throw e.toEvalError( this, callstack );
51		}
52	}
53
54	public LHS toLHS(CallStack callstack, Interpreter interpreter) 
55		throws EvalError
56	{
57		/*
58			Get the prefix, which may be either an ambiguous name or a
59			method invocation.  
60
61			The method invocation bit here is somewhat of a hack to handle 
62			the fact that we have moved prefix method invocation into the 
63			PrimaryPrefix in order to get it to always produce an object type.
64
65			This is too complicated.
66		*/
67		int childNum = 0;
68		SimpleNode prefixNode = (SimpleNode)jjtGetChild(childNum++);
69		Object prefixValue = null;
70		LHS lhs = null;
71		if ( prefixNode instanceof BSHAmbiguousName )
72			lhs = ((BSHAmbiguousName)prefixNode).toLHS( callstack, interpreter);
73		else
74			// Currently the only case is for BSHMethodInvocation
75			prefixValue = 
76				((SimpleNode)prefixNode).eval( callstack, interpreter);
77
78		// If the prefix is an object and not an LHS it requires at least
79		// one suffix to make an LHS
80		// Currently the only case is for BSHMethodInvocation
81		if ( prefixValue != null )
82			lhs = ((BSHLHSPrimarySuffix)jjtGetChild(childNum++)).doLHSSuffix(
83				prefixValue, callstack, interpreter);
84
85		// Apply the suffixes
86		int numChildren = jjtGetNumChildren(); 
87		while ( childNum<numChildren )
88			try {
89				lhs = ((BSHLHSPrimarySuffix)jjtGetChild(childNum++))
90					.doLHSSuffix( lhs.getValue(), callstack, interpreter);
91			} catch ( UtilEvalError e ) {
92				throw e.toEvalError( this, callstack  );
93			}
94
95		return lhs;
96	}
97}
98