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1 package org.drools.semantics.python; 2 3 /* 4 $Id: ExprVisitor.java,v 1.3 2003/03/25 19:47:32 tdiesler 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 10 that the following conditions are met: 11 12 1. Redistributions of source code must retain copyright 13 statements and notices. Redistributions must also contain a 14 copy of this document. 15 16 2. Redistributions in binary form must reproduce the 17 above copyright notice, this list of conditions and the 18 following disclaimer in the documentation and/or other 19 materials provided with the distribution. 20 21 3. The name "drools" must not be used to endorse or promote 22 products derived from this Software without prior written 23 permission of The Werken Company. For written permission, 24 please contact bob@werken.com. 25 26 4. Products derived from this Software may not be called "drools" 27 nor may "drools" appear in their names without prior written 28 permission of The Werken Company. "drools" is a registered 29 trademark of The Werken Company. 30 31 5. Due credit should be given to The Werken Company. 32 (http://drools.werken.com/). 33 34 THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS 35 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 36 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 37 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 38 THE WERKEN COMPANY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 39 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 40 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 41 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 42 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 43 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 44 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 45 OF THE POSSIBILITY OF SUCH DAMAGE. 46 47 */ 48 /* 49 (c) Copyright 2001, 2002 Tonic Software, Inc. 50 All Rights Reserved 51 */ 52 53 import org.python.parser.SimpleNode; 54 import org.python.parser.Visitor; 55 import org.python.parser.ast.Name; 56 57 import java.util.HashSet; 58 import java.util.Set; 59 60 /*** Visits nodes in a Jython parse tree to extract the individual expression criteria. 61 * 62 * @author <a href="martin@tonic.com">Martin Chilvers</a> 63 * @author <a href="bob@werken.com">bob mcwhirter</a> 64 * @author <a href="mailto:christiaan@dacelo.nl">Christiaan ten Klooster</a> 65 */ 66 public class ExprVisitor extends Visitor 67 { 68 // ------------------------------------------------------------ 69 // Instance members 70 // ------------------------------------------------------------ 71 72 /*** List of the variables as we parse an expression. */ 73 private Set variables; 74 75 // ------------------------------------------------------------ 76 // Constructors 77 // ------------------------------------------------------------ 78 79 /*** Construct. 80 */ 81 ExprVisitor() 82 { 83 // intentionally left blank. 84 } 85 86 // ------------------------------------------------------------ 87 // Instance methods 88 // ------------------------------------------------------------ 89 90 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 91 // org.python.parser.Visitor 92 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 93 94 /*** Visite the node. 95 * 96 * @param node The node. 97 * 98 * @return Set of variable names. 99 * 100 * @throws Exception If an error occurs while traversing. 101 */ 102 public Object eval_input(SimpleNode node) throws Exception 103 { 104 variables = new HashSet(); 105 106 traverse( node ); 107 108 return variables; 109 } 110 111 /*** Visit a Name node. 112 * 113 * @param Name The node. 114 * 115 * @return The node. 116 * 117 * @throws Exception If an error occurs while traversing. 118 */ 119 public Object visitName(Name node) throws Exception 120 { 121 variables.add( ((Name)node).id ); 122 123 return node; 124 } 125 126 }

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