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

#
Java | 99 lines | 48 code | 15 blank | 36 comment | 8 complexity | 8af0d4dbd81804afb29faeb766c50899 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
37/**
38	This class handles both while(){} statements and do{}while() statements.
39*/
40class BSHWhileStatement extends SimpleNode implements ParserConstants
41{
42	public boolean isDoStatement;
43
44    BSHWhileStatement(int id) { super(id); }
45
46    public Object eval( CallStack callstack, Interpreter interpreter)  
47		throws EvalError
48    {
49		int numChild = jjtGetNumChildren();
50
51		// Order of body and condition is swapped for do / while
52        SimpleNode condExp, body = null;
53
54		if ( isDoStatement ) {
55			condExp = (SimpleNode)jjtGetChild(1);
56			body =(SimpleNode)jjtGetChild(0);
57		} else {
58			condExp = (SimpleNode)jjtGetChild(0);
59			if ( numChild > 1 )	// has body, else just for side effects
60				body =(SimpleNode)jjtGetChild(1);
61		}
62
63		boolean doOnceFlag = isDoStatement;
64        while( 
65			doOnceFlag || 
66			BSHIfStatement.evaluateCondition(condExp, callstack, interpreter )
67		)
68		{
69			if ( body == null ) // no body?
70				continue;
71
72			Object ret = body.eval(callstack, interpreter);
73
74			boolean breakout = false;
75			if(ret instanceof ReturnControl)
76			{
77				switch(((ReturnControl)ret).kind )
78				{
79					case RETURN:
80						return ret;
81
82					case CONTINUE:
83						continue;
84
85					case BREAK:
86						breakout = true;
87						break;
88				}
89			}
90			if(breakout)
91				break;
92
93			doOnceFlag = false;
94		}
95
96        return Primitive.VOID;
97    }
98
99}