001    /*
002     $Id: BinaryExpression.java,v 1.10 2005/11/13 16:42:09 blackdrag Exp $
003    
004     Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005    
006     Redistribution and use of this software and associated documentation
007     ("Software"), with or without modification, are permitted provided
008     that the following conditions are met:
009    
010     1. Redistributions of source code must retain copyright
011        statements and notices.  Redistributions must also contain a
012        copy of this document.
013    
014     2. Redistributions in binary form must reproduce the
015        above copyright notice, this list of conditions and the
016        following disclaimer in the documentation and/or other
017        materials provided with the distribution.
018    
019     3. The name "groovy" must not be used to endorse or promote
020        products derived from this Software without prior written
021        permission of The Codehaus.  For written permission,
022        please contact info@codehaus.org.
023    
024     4. Products derived from this Software may not be called "groovy"
025        nor may "groovy" appear in their names without prior written
026        permission of The Codehaus. "groovy" is a registered
027        trademark of The Codehaus.
028    
029     5. Due credit should be given to The Codehaus -
030        http://groovy.codehaus.org/
031    
032     THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
033     ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
034     NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
035     FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
036     THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
037     INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
038     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
039     SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
040     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
041     STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
042     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
043     OF THE POSSIBILITY OF SUCH DAMAGE.
044    
045     */
046    package org.codehaus.groovy.ast.expr;
047    
048    import java.math.BigDecimal;
049    import java.math.BigInteger;
050    
051    import org.codehaus.groovy.ast.ClassNode;
052    import org.codehaus.groovy.ast.GroovyCodeVisitor;
053    import org.codehaus.groovy.syntax.Token;
054    import org.codehaus.groovy.syntax.Types;
055    
056    /**
057     * Represents two expressions and an operation
058     * 
059     * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
060     * @version $Revision: 1.10 $
061     */
062    public class BinaryExpression extends Expression {
063        
064        private Expression leftExpression;
065        private Expression rightExpression;
066        private Token operation;
067        
068        public BinaryExpression(Expression leftExpression,
069                                Token operation,
070                                Expression rightExpression) {
071            this.leftExpression = leftExpression;
072            this.operation = operation;
073            this.rightExpression = rightExpression;
074    
075        }
076    
077        private static boolean isFloatingPoint(Class cls) {
078                    return cls == Double.class || cls == Float.class;
079            }
080    
081            private static boolean isInteger(Class cls) {
082                    return cls == Integer.class || cls == Byte.class || cls == Short.class || cls == Character.class;
083            }
084    
085            private static boolean isLong(Class cls) {
086                    return cls == Long.class;
087            }
088    
089            private static boolean isBigDecimal(Class cls) {
090                    return cls == BigDecimal.class;
091            }
092    
093            private static boolean isBigInteger(Class cls) {
094                    return cls == BigInteger.class;
095            }
096    
097        public String toString() {
098            return super.toString() +"[" + leftExpression + operation + rightExpression + "]";
099        }
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    }