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    1   /*
    2    $Id: BinaryExpression.java,v 1.12 2006/01/19 00:06:51 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
    39   SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    40   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    41   STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    42   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
    43   OF THE POSSIBILITY OF SUCH DAMAGE.
    44
    45   */
    46  package org.codehaus.groovy.ast.expr;
    47
    48  import org.codehaus.groovy.ast.ClassNode;
    49  import org.codehaus.groovy.ast.GroovyCodeVisitor;
    50  import org.codehaus.groovy.ast.Variable;
    51  import org.codehaus.groovy.syntax.Token;
    52  import org.codehaus.groovy.syntax.Types;
    53
    54  /***
    55   * Represents two expressions and an operation
    56   *
    57   * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
    58   * @version $Revision: 1.12 $
    59   */
    60  public class BinaryExpression extends Expression {
    61
    62      private Expression leftExpression;
    63      private Expression rightExpression;
    64      private Token operation;
    65
    66      public BinaryExpression(Expression leftExpression,
    67                              Token operation,
    68                              Expression rightExpression) {
    69          this.leftExpression = leftExpression;
    70          this.operation = operation;
    71          this.rightExpression = rightExpression;
    72      }
    73
    74      public String toString() {
    75          return super.toString() +"[" + leftExpression + operation + rightExpression + "]";
    76      }
    77
    78      public void visit(GroovyCodeVisitor visitor) {
    79          visitor.visitBinaryExpression(this);
    80      }
    81
    82      public Expression transformExpression(ExpressionTransformer transformer) {
    83          Expression ret = new BinaryExpression(transformer.transform(leftExpression), operation, transformer.transform(rightExpression));
    84          ret.setSourcePosition(this);
    85          return ret;
    86      }
    87
    88      public Expression getLeftExpression() {
    89          return leftExpression;
    90      }
    91
    92      public void setLeftExpression(Expression leftExpression) {
    93          this.leftExpression = leftExpression;
    94      }
    95
    96      public void setRightExpression(Expression rightExpression) {
    97          this.rightExpression = rightExpression;
    98      }
    99
    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 }