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/* valaccodeunaryexpression.vala
*
* Copyright (C) 2006-2009 Jürg Billeter
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Jürg Billeter <j@bitron.ch>
*/
using GLib;
/**
* Represents an expression with one operand in the C code.
*/
public class Vala.CCodeUnaryExpression : CCodeExpression {
/**
* The unary operator.
*/
public CCodeUnaryOperator operator { get; set; }
/**
* The operand.
*/
public CCodeExpression inner { get; set; }
public CCodeUnaryExpression (CCodeUnaryOperator op, CCodeExpression expr) {
operator = op;
inner = expr;
}
public override void write (CCodeWriter writer) {
switch (operator) {
case CCodeUnaryOperator.PLUS: writer.write_string ("+"); inner.write_inner (writer); break;
case CCodeUnaryOperator.MINUS: writer.write_string ("-"); inner.write_inner (writer); break;
case CCodeUnaryOperator.LOGICAL_NEGATION: writer.write_string ("!"); inner.write_inner (writer); break;
case CCodeUnaryOperator.BITWISE_COMPLEMENT: writer.write_string ("~"); inner.write_inner (writer); break;
case CCodeUnaryOperator.POINTER_INDIRECTION:
var inner_unary = inner as CCodeUnaryExpression;
if (inner_unary != null && inner_unary.operator == CCodeUnaryOperator.ADDRESS_OF) {
// simplify expression
inner_unary.inner.write (writer);
return;
}
writer.write_string ("*");
inner.write_inner (writer);
break;
case CCodeUnaryOperator.ADDRESS_OF:
var inner_unary = inner as CCodeUnaryExpression;
if (inner_unary != null && inner_unary.operator == CCodeUnaryOperator.POINTER_INDIRECTION) {
// simplify expression
inner_unary.inner.write (writer);
return;
}
writer.write_string ("&");
inner.write_inner (writer);
break;
case CCodeUnaryOperator.PREFIX_INCREMENT: writer.write_string ("++"); inner.write_inner (writer); break;
case CCodeUnaryOperator.PREFIX_DECREMENT: writer.write_string ("--"); inner.write_inner (writer); break;
case CCodeUnaryOperator.POSTFIX_INCREMENT: inner.write_inner (writer); writer.write_string ("++"); break;
case CCodeUnaryOperator.POSTFIX_DECREMENT: inner.write_inner (writer); writer.write_string ("--"); break;
default: assert_not_reached ();
}
}
public override void write_inner (CCodeWriter writer) {
writer.write_string ("(");
this.write (writer);
writer.write_string (")");
}
}
public enum Vala.CCodeUnaryOperator {
PLUS,
MINUS,
LOGICAL_NEGATION,
BITWISE_COMPLEMENT,
POINTER_INDIRECTION,
ADDRESS_OF,
PREFIX_INCREMENT,
PREFIX_DECREMENT,
POSTFIX_INCREMENT,
POSTFIX_DECREMENT
}
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