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%{
/* Expression parsing for plural form selection.
Copyright (C) 2000 Free Software Foundation, Inc.
Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <stdarg.h>
#include <stdlib.h>
#include "gettext.h"
#include "gettextP.h"
#define YYLEX_PARAM &((struct parse_args *) arg)->cp
#define YYPARSE_PARAM arg
%}
%pure_parser
%expect 10
%union {
unsigned long int num;
struct expression *exp;
}
%{
/* Prototypes for local functions. */
static struct expression *new_exp (enum operator op, ...);
static int yylex (YYSTYPE *lval, const char **pexp);
static void yyerror (const char *str);
%}
%left '?'
%left '|'
%left '&'
%left '=', '!'
%left '+', '-'
%left '*', '/', '%'
%token <num> NUMBER
%type <exp> exp
%%
start: exp
{
((struct parse_args *) arg)->res = $1;
}
;
exp: exp '?' exp ':' exp
{
if (($$ = new_exp (qmop, $1, $3, $5, NULL)) == NULL)
YYABORT
}
| exp '|' exp
{
if (($$ = new_exp (lor, $1, $3, NULL)) == NULL)
YYABORT
}
| exp '&' exp
{
if (($$ = new_exp (land, $1, $3, NULL)) == NULL)
YYABORT
}
| exp '=' exp
{
if (($$ = new_exp (equal, $1, $3, NULL)) == NULL)
YYABORT
}
| exp '!' exp
{
if (($$ = new_exp (not_equal, $1, $3, NULL)) == NULL)
YYABORT
}
| exp '+' exp
{
if (($$ = new_exp (plus, $1, $3, NULL)) == NULL)
YYABORT
}
| exp '-' exp
{
if (($$ = new_exp (minus, $1, $3, NULL)) == NULL)
YYABORT
}
| exp '*' exp
{
if (($$ = new_exp (mult, $1, $3, NULL)) == NULL)
YYABORT
}
| exp '/' exp
{
if (($$ = new_exp (divide, $1, $3, NULL)) == NULL)
YYABORT
}
| exp '%' exp
{
if (($$ = new_exp (module, $1, $3, NULL)) == NULL)
YYABORT
}
| 'n'
{
if (($$ = new_exp (var, NULL)) == NULL)
YYABORT
}
| NUMBER
{
if (($$ = new_exp (num, NULL)) == NULL)
YYABORT;
$$->val.num = $1
}
| '(' exp ')'
{
$$ = $2
}
;
%%
static struct expression *
new_exp (enum operator op, ...)
{
struct expression *newp = (struct expression *) malloc (sizeof (*newp));
va_list va;
struct expression *next;
va_start (va, op);
if (newp == NULL)
while ((next = va_arg (va, struct expression *)) != NULL)
__gettext_free_exp (next);
else
{
newp->operation = op;
next = va_arg (va, struct expression *);
if (next != NULL)
{
newp->val.args3.bexp = next;
next = va_arg (va, struct expression *);
if (next != NULL)
{
newp->val.args3.tbranch = next;
next = va_arg (va, struct expression *);
if (next != NULL)
newp->val.args3.fbranch = next;
}
}
}
va_end (va);
return newp;
}
void
internal_function
__gettext_free_exp (struct expression *exp)
{
if (exp == NULL)
return;
/* Handle the recursive case. */
switch (exp->operation)
{
case qmop:
__gettext_free_exp (exp->val.args3.fbranch);
/* FALLTHROUGH */
case mult:
case divide:
case module:
case plus:
case minus:
case equal:
case not_equal:
case land:
case lor:
__gettext_free_exp (exp->val.args2.right);
__gettext_free_exp (exp->val.args2.left);
break;
default:
break;
}
free (exp);
}
static int
yylex (YYSTYPE *lval, const char **pexp)
{
const char *exp = *pexp;
int result;
while (1)
{
if (exp[0] == '\\' && exp[1] == '\n')
{
exp += 2;
continue;
}
if (exp[0] != '\0' && exp[0] != ' ' && exp[0] != '\t')
break;
++exp;
}
result = *exp++;
switch (result)
{
case '0' ... '9':
{
unsigned long int n = exp[-1] - '0';
while (exp[0] >= '0' && exp[0] <= '9')
{
n *= 10;
n += exp[0] - '0';
++exp;
}
lval->num = n;
result = NUMBER;
}
break;
case '=':
case '!':
if (exp[0] == '=')
++exp;
else
result = YYERRCODE;
break;
case '&':
case '|':
if (exp[0] == result)
++exp;
else
result = YYERRCODE;
break;
case 'n':
case '*':
case '/':
case '%':
case '+':
case '-':
case '?':
case ':':
case '(':
case ')':
/* Nothing, just return the character. */
break;
case '\n':
case '\0':
/* Be safe and let the user call this function again. */
--exp;
result = YYEOF;
break;
default:
result = YYERRCODE;
#if YYDEBUG != 0
--exp;
#endif
break;
}
*pexp = exp;
return result;
}
static void
yyerror (const char *str)
{
/* Do nothing. We don't print error messages here. */
}
|
