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


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
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7  * the License at http://www.eclipse.org/legal/cpl-v10.html
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10  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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13  *
14  * Copyright (C) 2006 Thomas E Enebo <enebo@acm.org>
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17  * either of the GNU General Public License Version 2 or later (the "GPL"),
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28 package org.jruby.parser;
29
30 import org.jruby.ast.AssignableNode;
31 import org.jruby.ast.DAsgnNode;
32 import org.jruby.ast.DVarNode;
33 import org.jruby.ast.Node;
34 import org.jruby.lexer.yacc.ISourcePosition;
35
36 public class BlockStaticScope extends StaticScope {
37     private static final long serialVersionUID = -3882063260379968149L;
38
39     public BlockStaticScope(StaticScope parentScope) {
40         super(parentScope);
41     }
42     
43     public StaticScope getLocalScope() {
44         return getEnclosingScope().getLocalScope();
45     }
46     
47     public int isDefined(String JavaDoc name, int depth) {
48         int slot = exists(name);
49         if (slot >= 0) return (depth << 16) | exists(name);
50         
51         return getEnclosingScope().isDefined(name, depth + 1);
52     }
53     
54     /**
55      * @see org.jruby.parser.StaticScope#getAllNamesInScope()
56      */
57     public String JavaDoc[] getAllNamesInScope() {
58         String JavaDoc[] variables = getEnclosingScope().getAllNamesInScope();
59         String JavaDoc[] ourVariables = getVariables();
60
61         // We have no names to add to existing list
62 if (ourVariables == null) return variables;
63         
64         // we know variables cannot be null since localstaticscope will create a 0 length one.
65 int newSize = variables.length + ourVariables.length;
66         String JavaDoc[] names = new String JavaDoc[newSize];
67         
68         System.arraycopy(variables, 0, names, 0, variables.length);
69         System.arraycopy(ourVariables, 0, names, variables.length, ourVariables.length);
70         
71         return names;
72     }
73
74     protected AssignableNode assign(ISourcePosition position, String JavaDoc name, Node value,
75             StaticScope topScope, int depth) {
76         int slot = exists(name);
77         
78         if (slot >= 0) {
79             return new DAsgnNode(position, name, ((depth << 16) | slot), value);
80         }
81
82         return getEnclosingScope().assign(position, name, value, topScope, depth + 1);
83     }
84
85     public AssignableNode addAssign(ISourcePosition position, String JavaDoc name, Node value) {
86         int slot = addVariable(name);
87         
88         // No bit math to store level since we know level is zero for this case
89 return new DAsgnNode(position, name, slot, value);
90     }
91
92     public Node declare(ISourcePosition position, String JavaDoc name, int depth) {
93         int slot = exists(name);
94
95         if (slot >= 0) {
96             return new DVarNode(position, ((depth << 16) | slot), name);
97         }
98         
99         return getEnclosingScope().declare(position, name, depth + 1);
100     }
101 }
102
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