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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
PythonExprVisitor.java | - | 100% | 100% | 100% |
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1 | package org.drools.semantics.python; | |
2 | ||
3 | /* | |
4 | * $Id: PythonExprVisitor.java,v 1.2 2005/02/04 02:13:38 mproctor Exp $ | |
5 | * | |
6 | * Copyright 2002 (C) The Werken Company. All Rights Reserved. | |
7 | * | |
8 | * Redistribution and use of this software and associated documentation | |
9 | * ("Software"), with or without modification, are permitted provided that the | |
10 | * following conditions are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain copyright statements and | |
13 | * notices. Redistributions must also contain a copy of this document. | |
14 | * | |
15 | * 2. Redistributions in binary form must reproduce the above copyright notice, | |
16 | * this list of conditions and the following disclaimer in the documentation | |
17 | * and/or other materials provided with the distribution. | |
18 | * | |
19 | * 3. The name "drools" must not be used to endorse or promote products derived | |
20 | * from this Software without prior written permission of The Werken Company. | |
21 | * For written permission, please contact bob@werken.com. | |
22 | * | |
23 | * 4. Products derived from this Software may not be called "drools" nor may | |
24 | * "drools" appear in their names without prior written permission of The Werken | |
25 | * Company. "drools" is a registered trademark of The Werken Company. | |
26 | * | |
27 | * 5. Due credit should be given to The Werken Company. | |
28 | * (http://drools.werken.com/). | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``AS IS'' | |
31 | * AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
32 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
33 | * ARE DISCLAIMED. IN NO EVENT SHALL THE WERKEN COMPANY OR ITS CONTRIBUTORS BE | |
34 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
35 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
36 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
37 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
38 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
39 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
40 | * POSSIBILITY OF SUCH DAMAGE. | |
41 | * | |
42 | */ | |
43 | /* | |
44 | * (c) Copyright 2001, 2002 Tonic Software, Inc. All Rights Reserved | |
45 | */ | |
46 | ||
47 | import java.util.HashSet; | |
48 | import java.util.Set; | |
49 | ||
50 | import org.python.parser.SimpleNode; | |
51 | import org.python.parser.Visitor; | |
52 | import org.python.parser.ast.Name; | |
53 | ||
54 | /** | |
55 | * Visits nodes in a Jython parse tree to extract the individual expression | |
56 | * criteria. | |
57 | * | |
58 | * @author <a href="martin@tonic.com">Martin Chilvers </a> | |
59 | * @author <a href="bob@werken.com">bob mcwhirter </a> | |
60 | * @author <a href="mailto:christiaan@dacelo.nl">Christiaan ten Klooster </a> | |
61 | */ | |
62 | public class PythonExprVisitor extends Visitor | |
63 | { | |
64 | // ------------------------------------------------------------ | |
65 | // Instance members | |
66 | // ------------------------------------------------------------ | |
67 | ||
68 | /** List of the variables as we parse an expression. */ | |
69 | private Set variables; | |
70 | ||
71 | // ------------------------------------------------------------ | |
72 | // Constructors | |
73 | // ------------------------------------------------------------ | |
74 | ||
75 | /** | |
76 | * Construct. | |
77 | */ | |
78 | 21 | PythonExprVisitor() |
79 | { | |
80 | // intentionally left blank. | |
81 | } | |
82 | ||
83 | // ------------------------------------------------------------ | |
84 | // Instance methods | |
85 | // ------------------------------------------------------------ | |
86 | ||
87 | // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | |
88 | // org.python.parser.Visitor | |
89 | // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | |
90 | ||
91 | /** | |
92 | * Visite the node. | |
93 | * | |
94 | * @param node The node. | |
95 | * | |
96 | * @return Set of variable names. | |
97 | * | |
98 | * @throws Exception If an error occurs while traversing. | |
99 | */ | |
100 | 21 | public Object eval_input( SimpleNode node ) throws Exception |
101 | { | |
102 | 21 | variables = new HashSet( ); |
103 | ||
104 | 21 | traverse( node ); |
105 | ||
106 | 21 | return variables; |
107 | } | |
108 | ||
109 | /** | |
110 | * Visit a Name node. | |
111 | * | |
112 | * @param node The node. | |
113 | * | |
114 | * @return The node. | |
115 | * | |
116 | * @throws Exception If an error occurs while traversing. | |
117 | */ | |
118 | 26 | public Object visitName( Name node ) throws Exception |
119 | { | |
120 | 26 | variables.add( node.id ); |
121 | ||
122 | 26 | return node; |
123 | } | |
124 | } |
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