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1   /*
2    $Id: BinaryExpression.java,v 1.10 2005/11/13 16:42:09 blackdrag Exp $
3   
4    Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
5   
6    Redistribution and use of this software and associated documentation
7    ("Software"), with or without modification, are permitted provided
8    that the following conditions are met:
9   
10   1. Redistributions of source code must retain copyright
11      statements and notices.  Redistributions must also contain a
12      copy of this document.
13  
14   2. Redistributions in binary form must reproduce the
15      above copyright notice, this list of conditions and the
16      following disclaimer in the documentation and/or other
17      materials provided with the distribution.
18  
19   3. The name "groovy" must not be used to endorse or promote
20      products derived from this Software without prior written
21      permission of The Codehaus.  For written permission,
22      please contact info@codehaus.org.
23  
24   4. Products derived from this Software may not be called "groovy"
25      nor may "groovy" appear in their names without prior written
26      permission of The Codehaus. "groovy" is a registered
27      trademark of The Codehaus.
28  
29   5. Due credit should be given to The Codehaus -
30      http://groovy.codehaus.org/
31  
32   THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
33   ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
34   NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
35   FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
36   THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
37   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
38   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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44  
45   */
46  package org.codehaus.groovy.ast.expr;
47  
48  import java.math.BigDecimal;
49  import java.math.BigInteger;
50  
51  import org.codehaus.groovy.ast.ClassNode;
52  import org.codehaus.groovy.ast.GroovyCodeVisitor;
53  import org.codehaus.groovy.syntax.Token;
54  import org.codehaus.groovy.syntax.Types;
55  
56  /***
57   * Represents two expressions and an operation
58   * 
59   * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
60   * @version $Revision: 1.10 $
61   */
62  public class BinaryExpression extends Expression {
63      
64      private Expression leftExpression;
65      private Expression rightExpression;
66      private Token operation;
67      
68      public BinaryExpression(Expression leftExpression,
69                              Token operation,
70                              Expression rightExpression) {
71          this.leftExpression = leftExpression;
72          this.operation = operation;
73          this.rightExpression = rightExpression;
74  
75      }
76  
77      private static boolean isFloatingPoint(Class cls) {
78  		return cls == Double.class || cls == Float.class;
79  	}
80  
81  	private static boolean isInteger(Class cls) {
82  		return cls == Integer.class || cls == Byte.class || cls == Short.class || cls == Character.class;
83  	}
84  
85  	private static boolean isLong(Class cls) {
86  		return cls == Long.class;
87  	}
88  
89  	private static boolean isBigDecimal(Class cls) {
90  		return cls == BigDecimal.class;
91  	}
92  
93  	private static boolean isBigInteger(Class cls) {
94  		return cls == BigInteger.class;
95  	}
96  
97      public String toString() {
98          return super.toString() +"[" + leftExpression + operation + rightExpression + "]";
99      }
100 
101     public void visit(GroovyCodeVisitor visitor) {
102         visitor.visitBinaryExpression(this);
103     }
104 
105     public Expression transformExpression(ExpressionTransformer transformer) {
106         return new BinaryExpression(transformer.transform(leftExpression), operation, transformer.transform(rightExpression));
107     }
108 
109     public Expression getLeftExpression() {
110         return leftExpression;
111     }
112 
113     public void setLeftExpression(Expression leftExpression) {
114         this.leftExpression = leftExpression;
115     }
116 
117     public void setRightExpression(Expression rightExpression) {
118         this.rightExpression = rightExpression;
119     }
120 
121     public Token getOperation() {
122         return operation;
123     }
124 
125     public Expression getRightExpression() {
126         return rightExpression;
127     }
128 
129     public String getText() {
130         if (operation.getType() == Types.LEFT_SQUARE_BRACKET) {
131             return leftExpression.getText() + "[" + rightExpression.getText() + "]";
132         }
133         return "(" + leftExpression.getText() + " " + operation.getText() + " " + rightExpression.getText() + ")";
134     }
135     
136     
137    /***
138     *  Creates an assignment expression in which the specified expression
139     *  is written into the specified variable name.   
140     */
141     
142     public static BinaryExpression newAssignmentExpression( String variable, Expression rhs ) {
143     	VariableExpression lhs = new VariableExpression( variable );
144     	Token         operator = Token.newPlaceholder( Types.ASSIGN );
145     
146     	return new BinaryExpression( lhs, operator, rhs );
147     }
148 
149 
150     /***
151      *  Creates variable initialization expression in which the specified expression
152      *  is written into the specified variable name.   
153      */
154      
155      public static BinaryExpression newInitializationExpression( String variable, ClassNode type, Expression rhs ) {
156      	VariableExpression lhs = new VariableExpression( variable );
157      
158      	if( type != null ) {
159      	    lhs.setType(type);
160      	}
161      
162      	Token operator = Token.newPlaceholder( Types.ASSIGN );
163      
164         return new BinaryExpression( lhs, operator, rhs );
165      }
166 
167 }