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|
%{
/***************************************************************************
* gram.y -- Grammar for the Reverse Polish Calculator *
* *
* A little RPN (Reverse Polish Notation) calculator, rudimentary *
* emulating a HP 28S. *
* *
* rpncalc is (c) David Frey, 1993, 1994, 1995, 1996, 1997, 1998 *
* *
* 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; either version 2 of the License, or (at your *
* option) any later version. *
* *
* 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., 59 Temple Place Suite 330, Boston, MA 02111-1307 USA. *
***************************************************************************/
/* $Id: gram.y,v 1.4 2000/04/02 16:12:17 david Rel $
* $Log: gram.y,v $
* Revision 1.4 2000/04/02 16:12:17 david
* Added `#include <string.h>', added declaration of `pushtostack'.
*
* Revision 1.3 1999/09/12 20:51:45 david
* Added gettext support.
* Added variables and functions.
* Set errno to 0 before function calls.
*
* Revision 1.2 1999/03/07 16:35:16 david
* Simplified grammar, handles now EOF correctly.
*
* Revision 1.1 1999/03/06 14:45:27 david
* Initial revision
*
*/
#include <stdio.h>
#include <errno.h>
#include <malloc.h>
#include <string.h>
#include <search.h>
#include "cmds.h"
#include "stack.h"
#include "utils.h"
#ifdef HAVE_GETTEXT
#include <libintl.h>
#define _(String) gettext(String)
#else
#define _(String) (String)
#define textdomain(Domain)
#define bindtextdomain(Package, Directory)
#endif
extern int lineno;
extern int pushtostack;
extern void yyerror(const char *s);
extern int yylex(void);
#define MAXNOOFVARS 256
struct var vartab[MAXNOOFVARS];
%}
%union {
char *name;
struct cmd *func;
double dnum;
long int inum;
}
%token <name> VAR
%token <inum> INT
%token <dnum> REAL
%token <func> CMD FUNC
%token <name> HELP
%%
input: /* empty */
| input { pushtostack=1; } line
;
line: '\n' { lineno++; showstack(); }
| explist
| help
;
explist: exp
| explist exp
;
exp: CMD { double op1=0.0, op2=0.0;
errno=0;
switch ($1->argno) {
case 0: $1->fnct();
break;
case 1: op1=pop();
$1->fnct(op1);
break;
case 2: op2=pop(); op1=pop();
$1->fnct(op1,op2);
break;
}
if (errno != 0) yyerror(strerror(errno));
}
| FUNC { double op1=0.0, op2=0.0, res=0.0;
errno=0;
switch ($1->argno) {
case 0: res=$1->fnct();
break;
case 1: op1=pop();
res=$1->fnct(op1);
break;
case 2: op2=pop(); op1=pop();
res=$1->fnct(op1,op2);
break;
}
if (errno != 0) yyerror(strerror(errno));
push(res);
}
| VAR { struct var s, *r;
s.vname=$1;
s.value=0.0;
r=lfind(&s, &vartab, &noofvars,
sizeof(struct var), varcmp);
if (r != NULL) {
push(r->value);
} else {
yyerror(_("undefined variable"));
}
free($1);
}
| VAR '=' { struct var v, *r;
v.vname=xstrdup($1);
v.value=pop();
v.isconst=0;
r=lfind(&v, &vartab, &noofvars,
sizeof(struct var), varcmp);
if (r != NULL) {
if (r->isconst) {
yyerror(_("is a constant"));
} else {
r->value=v.value;
}
} else {
if (noofvars < MAXNOOFVARS) {
lsearch(&v, &vartab, &noofvars,
sizeof(struct var), varcmp);
} else {
yyerror(_("variable table is full"));
}
}
free($1);
}
| INT { push($1); }
| REAL { push($1); }
;
help: HELP CMD { help($2); }
| HELP FUNC { help($2); }
| HELP HELP { help(NULL); }
| HELP { help(NULL); }
;
%%
|
