001 /*
002 $Id: BinaryExpression.java 3419 2006-01-19 00:07:02Z blackdrag $
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 org.codehaus.groovy.ast.ClassNode;
049 import org.codehaus.groovy.ast.GroovyCodeVisitor;
050 import org.codehaus.groovy.ast.Variable;
051 import org.codehaus.groovy.syntax.Token;
052 import org.codehaus.groovy.syntax.Types;
053
054 /**
055 * Represents two expressions and an operation
056 *
057 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
058 * @version $Revision: 3419 $
059 */
060 public class BinaryExpression extends Expression {
061
062 private Expression leftExpression;
063 private Expression rightExpression;
064 private Token operation;
065
066 public BinaryExpression(Expression leftExpression,
067 Token operation,
068 Expression rightExpression) {
069 this.leftExpression = leftExpression;
070 this.operation = operation;
071 this.rightExpression = rightExpression;
072 }
073
074 public String toString() {
075 return super.toString() +"[" + leftExpression + operation + rightExpression + "]";
076 }
077
078 public void visit(GroovyCodeVisitor visitor) {
079 visitor.visitBinaryExpression(this);
080 }
081
082 public Expression transformExpression(ExpressionTransformer transformer) {
083 Expression ret = new BinaryExpression(transformer.transform(leftExpression), operation, transformer.transform(rightExpression));
084 ret.setSourcePosition(this);
085 return ret;
086 }
087
088 public Expression getLeftExpression() {
089 return leftExpression;
090 }
091
092 public void setLeftExpression(Expression leftExpression) {
093 this.leftExpression = leftExpression;
094 }
095
096 public void setRightExpression(Expression rightExpression) {
097 this.rightExpression = rightExpression;
098 }
099
100 public Token getOperation() {
101 return operation;
102 }
103
104 public Expression getRightExpression() {
105 return rightExpression;
106 }
107
108 public String getText() {
109 if (operation.getType() == Types.LEFT_SQUARE_BRACKET) {
110 return leftExpression.getText() + "[" + rightExpression.getText() + "]";
111 }
112 return "(" + leftExpression.getText() + " " + operation.getText() + " " + rightExpression.getText() + ")";
113 }
114
115
116 /**
117 * Creates an assignment expression in which the specified expression
118 * is written into the specified variable name.
119 */
120
121 public static BinaryExpression newAssignmentExpression( Variable variable, Expression rhs ) {
122 VariableExpression lhs = new VariableExpression( variable );
123 Token operator = Token.newPlaceholder( Types.ASSIGN );
124
125 return new BinaryExpression( lhs, operator, rhs );
126 }
127
128
129 /**
130 * Creates variable initialization expression in which the specified expression
131 * is written into the specified variable name.
132 */
133
134 public static BinaryExpression newInitializationExpression( String variable, ClassNode type, Expression rhs ) {
135 VariableExpression lhs = new VariableExpression( variable );
136
137 if( type != null ) {
138 lhs.setType(type);
139 }
140
141 Token operator = Token.newPlaceholder( Types.ASSIGN );
142
143 return new BinaryExpression( lhs, operator, rhs );
144 }
145
146 }