KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > jruby > parser > RubyParserConfiguration


1 /***** BEGIN LICENSE BLOCK *****
2  * Version: CPL 1.0/GPL 2.0/LGPL 2.1
3  *
4  * The contents of this file are subject to the Common Public
5  * License Version 1.0 (the "License"); you may not use this file
6  * except in compliance with the License. You may obtain a copy of
7  * the License at http://www.eclipse.org/legal/cpl-v10.html
8  *
9  * Software distributed under the License is distributed on an "AS
10  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
11  * implied. See the License for the specific language governing
12  * rights and limitations under the License.
13  *
14  * Copyright (C) 2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
15  * Copyright (C) 2004 Thomas E Enebo <enebo@acm.org>
16  * Copyright (C) 2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
17  *
18  * Alternatively, the contents of this file may be used under the terms of
19  * either of the GNU General Public License Version 2 or later (the "GPL"),
20  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
21  * in which case the provisions of the GPL or the LGPL are applicable instead
22  * of those above. If you wish to allow use of your version of this file only
23  * under the terms of either the GPL or the LGPL, and not to allow others to
24  * use your version of this file under the terms of the CPL, indicate your
25  * decision by deleting the provisions above and replace them with the notice
26  * and other provisions required by the GPL or the LGPL. If you do not delete
27  * the provisions above, a recipient may use your version of this file under
28  * the terms of any one of the CPL, the GPL or the LGPL.
29  ***** END LICENSE BLOCK *****/
30 package org.jruby.parser;
31
32 import org.jruby.runtime.DynamicScope;
33
34 public class RubyParserConfiguration {
35     private DynamicScope existingScope = null;
36     private boolean asBlock = false;
37
38     /**
39      * If we are performing an eval we should pass existing scope in.
40      * Calling this lets the parser know we need to do this.
41      *
42      * @param existingScope is the scope that captures new vars, etc...
43      */
44     public void parseAsBlock(DynamicScope existingScope) {
45         this.asBlock = true;
46         this.existingScope = existingScope;
47     }
48     
49     /**
50      * This method returns the appropriate first scope for the parser.
51      *
52      * @return correct top scope for source to be parsed
53      */
54     public DynamicScope getScope() {
55         if (asBlock) {
56             return existingScope;
57         }
58         
59         // FIXME: We should really not be creating the dynamic scope for the root
60 // of the AST before parsing. This makes us end up needing to readjust
61 // this dynamic scope coming out of parse (and for local static scopes it
62 // will always happen because of $~ and $_).
63 return new DynamicScope(new LocalStaticScope(null), existingScope);
64     }
65 }
66
Popular Tags