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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
PythonExprAnalyzer.java | 100% | 100% | 100% | 100% |
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1 | package org.drools.semantics.python; | |
2 | ||
3 | /* | |
4 | * $Id: PythonExprAnalyzer.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 | import java.util.ArrayList; | |
45 | import java.util.Iterator; | |
46 | import java.util.List; | |
47 | import java.util.Set; | |
48 | ||
49 | import org.drools.rule.Declaration; | |
50 | import org.python.parser.ast.modType; | |
51 | ||
52 | /** | |
53 | * Analyzes python expressions for all mentioned variables. | |
54 | * | |
55 | * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter </a> | |
56 | */ | |
57 | public class PythonExprAnalyzer | |
58 | { | |
59 | // ------------------------------------------------------------ | |
60 | // Constructors | |
61 | // ------------------------------------------------------------ | |
62 | ||
63 | /** | |
64 | * Construct. | |
65 | */ | |
66 | 21 | public PythonExprAnalyzer() |
67 | { | |
68 | // intentionally left blank | |
69 | } | |
70 | ||
71 | // ------------------------------------------------------------ | |
72 | // Instance methods | |
73 | // ------------------------------------------------------------ | |
74 | ||
75 | /** | |
76 | * Analyze an expression. | |
77 | * | |
78 | * @param expr The expression to analyze. | |
79 | * @param availDecls Total set of declarations available. | |
80 | * | |
81 | * @return The array of declarations used by the expression. | |
82 | * | |
83 | * @throws Exception If an error occurs while attempting to analyze the | |
84 | * expression. | |
85 | */ | |
86 | ||
87 | 21 | public Declaration[] analyze( modType expr, |
88 | List availDecls ) throws Exception | |
89 | { | |
90 | 21 | PythonExprVisitor visitor = new PythonExprVisitor( ); |
91 | ||
92 | 21 | List decls = new ArrayList( ); |
93 | ||
94 | 21 | Set refs = ( Set ) visitor.eval_input( expr ); |
95 | ||
96 | 21 | Iterator declIter = availDecls.iterator( ); |
97 | 21 | Declaration eachDecl; |
98 | ||
99 | 21 | while ( declIter.hasNext( ) ) |
100 | { | |
101 | 37 | eachDecl = ( Declaration ) declIter.next( ); |
102 | ||
103 | 37 | if ( refs.contains( eachDecl.getIdentifier( ) ) ) |
104 | { | |
105 | 19 | decls.add( eachDecl ); |
106 | 19 | refs.remove( eachDecl.getIdentifier( ) ); |
107 | } | |
108 | } | |
109 | ||
110 | 21 | return ( Declaration[] ) decls.toArray( new Declaration[ decls.size( ) ] ); |
111 | } | |
112 | } |
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