ccode/valaccodeunaryexpression.vala

   1 /* valaccodeunaryexpression.vala
   2  *
   3  * Copyright (C) 2006-2009  Jürg Billeter
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  18  *
  19  * Author:
  20  *      Jürg Billeter <j@bitron.ch>
  21  */
  22
  23 using GLib;
  24
  25 /**
  26  * Represents an expression with one operand in the C code.
  27  */
  28 public class Vala.CCodeUnaryExpression : CCodeExpression {
  29         /**
  30          * The unary operator.
  31          */
  32         public CCodeUnaryOperator operator { get; set; }
  33
  34         /**
  35          * The operand.
  36          */
  37         public CCodeExpression inner { get; set; }
  38
  39         public CCodeUnaryExpression (CCodeUnaryOperator op, CCodeExpression expr) {
  40                 operator = op;
  41                 inner = expr;
  42         }
  43
  44         public override void write (CCodeWriter writer) {
  45                 if (operator == CCodeUnaryOperator.PLUS) {
  46                         writer.write_string ("+");
  47                 } else if (operator == CCodeUnaryOperator.MINUS) {
  48                         writer.write_string ("-");
  49                 } else if (operator == CCodeUnaryOperator.LOGICAL_NEGATION) {
  50                         writer.write_string ("!");
  51                 } else if (operator == CCodeUnaryOperator.BITWISE_COMPLEMENT) {
  52                         writer.write_string ("~");
  53                 } else if (operator == CCodeUnaryOperator.POINTER_INDIRECTION) {
  54                         var inner_unary = inner as CCodeUnaryExpression;
  55                         if (inner_unary != null && inner_unary.operator == CCodeUnaryOperator.ADDRESS_OF) {
  56                                 // simplify expression
  57                                 inner_unary.inner.write (writer);
  58                                 return;
  59                         }
  60                         writer.write_string ("*");
  61                 } else if (operator == CCodeUnaryOperator.ADDRESS_OF) {
  62                         var inner_unary = inner as CCodeUnaryExpression;
  63                         if (inner_unary != null && inner_unary.operator == CCodeUnaryOperator.POINTER_INDIRECTION) {
  64                                 // simplify expression
  65                                 inner_unary.inner.write (writer);
  66                                 return;
  67                         }
  68                         writer.write_string ("&");
  69                 } else if (operator == CCodeUnaryOperator.PREFIX_INCREMENT) {
  70                         writer.write_string ("++");
  71                 } else if (operator == CCodeUnaryOperator.PREFIX_DECREMENT) {
  72                         writer.write_string ("--");
  73                 }
  74
  75                 inner.write_inner (writer);
  76
  77                 if (operator == CCodeUnaryOperator.POSTFIX_INCREMENT) {
  78                         writer.write_string ("++");
  79                 } else if (operator == CCodeUnaryOperator.POSTFIX_DECREMENT) {
  80                         writer.write_string ("--");
  81                 }
  82         }
  83
  84         public override void write_inner (CCodeWriter writer) {
  85                 writer.write_string ("(");
  86                 this.write (writer);
  87                 writer.write_string (")");
  88         }
  89 }
  90
  91 public enum Vala.CCodeUnaryOperator {
  92         PLUS,
  93         MINUS,
  94         LOGICAL_NEGATION,
  95         BITWISE_COMPLEMENT,
  96         POINTER_INDIRECTION,
  97         ADDRESS_OF,
  98         PREFIX_INCREMENT,
  99         PREFIX_DECREMENT,
 100         POSTFIX_INCREMENT,
 101         POSTFIX_DECREMENT
 102 }