1 files changed, 62 insertions, 0 deletions
diff --git a/expr.y b/expr.y
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+++ b/expr.y
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+%{
+/* $Id: expr.y,v 1.2 2006/11/05 04:42:43 ganzhorn Exp $
+ * This file is part of lfhex.
+ * Copyright (C) 2006 Salem Ganzhorn <eyekode@yahoo.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation version 2.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */  
+#define YYSTYPE off_t
+#include <iostream>
+
+#include <math.h>
+
+#include "expr.h"
+
+using namespace std;
+
+off_t expr_value;
+
+int exprlex();
+
+static int exprerror( const char * );
+
+%}
+
+%token NUMBER
+%left '-' '+' '*' '/'
+
+%%
+target : expr {
+   expr_value = $1;
+}
+;
+
+expr: /* nothing */
+| NUMBER        { $$ = $1; }
+| expr '+' expr { $$ = $1 + $3; }
+| expr '-' expr { $$ = $1 - $3; }
+| expr '*' expr { $$ = $1 * $3; }
+| '(' expr ')'  { $$ = $2; }
+;
+
+
+%%
+
+static int 
+exprerror( 
+   const char * str
+   )
+{
+   return 0;
+}