410 lines
8.0 KiB
Plaintext
410 lines
8.0 KiB
Plaintext
|
%{
|
||
|
|
/* Expression parsing for plural form selection.
|
||
|
|
Copyright (C) 2000, 2001 Free Software Foundation, Inc.
|
||
|
|
Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
|
||
|
|
|
||
|
|
This program 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, 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
|
||
|
|
Library General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Library 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. */
|
||
|
|
|
||
|
|
/* The bison generated parser uses alloca. AIX 3 forces us to put this
|
||
|
|
declaration at the beginning of the file. The declaration in bison's
|
||
|
|
skeleton file comes too late. This must come before <config.h>
|
||
|
|
because <config.h> may include arbitrary system headers. */
|
||
|
|
#if defined _AIX && !defined __GNUC__
|
||
|
|
#pragma alloca
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef HAVE_CONFIG_H
|
||
|
|
# include <config.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <stddef.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include "plural-exp.h"
|
||
|
|
|
||
|
|
/* The main function generated by the parser is called __gettextparse,
|
||
|
|
but we want it to be called PLURAL_PARSE. */
|
||
|
|
#ifndef _LIBC
|
||
|
|
# define __gettextparse PLURAL_PARSE
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define YYLEX_PARAM &((struct parse_args *) arg)->cp
|
||
|
|
#define YYPARSE_PARAM arg
|
||
|
|
%}
|
||
|
|
%pure_parser
|
||
|
|
%expect 7
|
||
|
|
|
||
|
|
%union {
|
||
|
|
unsigned long int num;
|
||
|
|
enum operator op;
|
||
|
|
struct expression *exp;
|
||
|
|
}
|
||
|
|
|
||
|
|
%{
|
||
|
|
/* Prototypes for local functions. */
|
||
|
|
static struct expression *new_exp PARAMS ((int nargs, enum operator op,
|
||
|
|
struct expression * const *args));
|
||
|
|
static inline struct expression *new_exp_0 PARAMS ((enum operator op));
|
||
|
|
static inline struct expression *new_exp_1 PARAMS ((enum operator op,
|
||
|
|
struct expression *right));
|
||
|
|
static struct expression *new_exp_2 PARAMS ((enum operator op,
|
||
|
|
struct expression *left,
|
||
|
|
struct expression *right));
|
||
|
|
static inline struct expression *new_exp_3 PARAMS ((enum operator op,
|
||
|
|
struct expression *bexp,
|
||
|
|
struct expression *tbranch,
|
||
|
|
struct expression *fbranch));
|
||
|
|
static int yylex PARAMS ((YYSTYPE *lval, const char **pexp));
|
||
|
|
static void yyerror PARAMS ((const char *str));
|
||
|
|
|
||
|
|
/* Allocation of expressions. */
|
||
|
|
|
||
|
|
static struct expression *
|
||
|
|
new_exp (nargs, op, args)
|
||
|
|
int nargs;
|
||
|
|
enum operator op;
|
||
|
|
struct expression * const *args;
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
struct expression *newp;
|
||
|
|
|
||
|
|
/* If any of the argument could not be malloc'ed, just return NULL. */
|
||
|
|
for (i = nargs - 1; i >= 0; i--)
|
||
|
|
if (args[i] == NULL)
|
||
|
|
goto fail;
|
||
|
|
|
||
|
|
/* Allocate a new expression. */
|
||
|
|
newp = (struct expression *) malloc (sizeof (*newp));
|
||
|
|
if (newp != NULL)
|
||
|
|
{
|
||
|
|
newp->nargs = nargs;
|
||
|
|
newp->operation = op;
|
||
|
|
for (i = nargs - 1; i >= 0; i--)
|
||
|
|
newp->val.args[i] = args[i];
|
||
|
|
return newp;
|
||
|
|
}
|
||
|
|
|
||
|
|
fail:
|
||
|
|
for (i = nargs - 1; i >= 0; i--)
|
||
|
|
FREE_EXPRESSION (args[i]);
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline struct expression *
|
||
|
|
new_exp_0 (op)
|
||
|
|
enum operator op;
|
||
|
|
{
|
||
|
|
return new_exp (0, op, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline struct expression *
|
||
|
|
new_exp_1 (op, right)
|
||
|
|
enum operator op;
|
||
|
|
struct expression *right;
|
||
|
|
{
|
||
|
|
struct expression *args[1];
|
||
|
|
|
||
|
|
args[0] = right;
|
||
|
|
return new_exp (1, op, args);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct expression *
|
||
|
|
new_exp_2 (op, left, right)
|
||
|
|
enum operator op;
|
||
|
|
struct expression *left;
|
||
|
|
struct expression *right;
|
||
|
|
{
|
||
|
|
struct expression *args[2];
|
||
|
|
|
||
|
|
args[0] = left;
|
||
|
|
args[1] = right;
|
||
|
|
return new_exp (2, op, args);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline struct expression *
|
||
|
|
new_exp_3 (op, bexp, tbranch, fbranch)
|
||
|
|
enum operator op;
|
||
|
|
struct expression *bexp;
|
||
|
|
struct expression *tbranch;
|
||
|
|
struct expression *fbranch;
|
||
|
|
{
|
||
|
|
struct expression *args[3];
|
||
|
|
|
||
|
|
args[0] = bexp;
|
||
|
|
args[1] = tbranch;
|
||
|
|
args[2] = fbranch;
|
||
|
|
return new_exp (3, op, args);
|
||
|
|
}
|
||
|
|
|
||
|
|
%}
|
||
|
|
|
||
|
|
/* This declares that all operators have the same associativity and the
|
||
|
|
precedence order as in C. See [Harbison, Steele: C, A Reference Manual].
|
||
|
|
There is no unary minus and no bitwise operators.
|
||
|
|
Operators with the same syntactic behaviour have been merged into a single
|
||
|
|
token, to save space in the array generated by bison. */
|
||
|
|
%right '?' /* ? */
|
||
|
|
%left '|' /* || */
|
||
|
|
%left '&' /* && */
|
||
|
|
%left EQUOP2 /* == != */
|
||
|
|
%left CMPOP2 /* < > <= >= */
|
||
|
|
%left ADDOP2 /* + - */
|
||
|
|
%left MULOP2 /* * / % */
|
||
|
|
%right '!' /* ! */
|
||
|
|
|
||
|
|
%token <op> EQUOP2 CMPOP2 ADDOP2 MULOP2
|
||
|
|
%token <num> NUMBER
|
||
|
|
%type <exp> exp
|
||
|
|
|
||
|
|
%%
|
||
|
|
|
||
|
|
start: exp
|
||
|
|
{
|
||
|
|
if ($1 == NULL)
|
||
|
|
YYABORT;
|
||
|
|
((struct parse_args *) arg)->res = $1;
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
exp: exp '?' exp ':' exp
|
||
|
|
{
|
||
|
|
$$ = new_exp_3 (qmop, $1, $3, $5);
|
||
|
|
}
|
||
|
|
| exp '|' exp
|
||
|
|
{
|
||
|
|
$$ = new_exp_2 (lor, $1, $3);
|
||
|
|
}
|
||
|
|
| exp '&' exp
|
||
|
|
{
|
||
|
|
$$ = new_exp_2 (land, $1, $3);
|
||
|
|
}
|
||
|
|
| exp EQUOP2 exp
|
||
|
|
{
|
||
|
|
$$ = new_exp_2 ($2, $1, $3);
|
||
|
|
}
|
||
|
|
| exp CMPOP2 exp
|
||
|
|
{
|
||
|
|
$$ = new_exp_2 ($2, $1, $3);
|
||
|
|
}
|
||
|
|
| exp ADDOP2 exp
|
||
|
|
{
|
||
|
|
$$ = new_exp_2 ($2, $1, $3);
|
||
|
|
}
|
||
|
|
| exp MULOP2 exp
|
||
|
|
{
|
||
|
|
$$ = new_exp_2 ($2, $1, $3);
|
||
|
|
}
|
||
|
|
| '!' exp
|
||
|
|
{
|
||
|
|
$$ = new_exp_1 (lnot, $2);
|
||
|
|
}
|
||
|
|
| 'n'
|
||
|
|
{
|
||
|
|
$$ = new_exp_0 (var);
|
||
|
|
}
|
||
|
|
| NUMBER
|
||
|
|
{
|
||
|
|
if (($$ = new_exp_0 (num)) != NULL)
|
||
|
|
$$->val.num = $1;
|
||
|
|
}
|
||
|
|
| '(' exp ')'
|
||
|
|
{
|
||
|
|
$$ = $2;
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
%%
|
||
|
|
|
||
|
|
void
|
||
|
|
internal_function
|
||
|
|
FREE_EXPRESSION (exp)
|
||
|
|
struct expression *exp;
|
||
|
|
{
|
||
|
|
if (exp == NULL)
|
||
|
|
return;
|
||
|
|
|
||
|
|
/* Handle the recursive case. */
|
||
|
|
switch (exp->nargs)
|
||
|
|
{
|
||
|
|
case 3:
|
||
|
|
FREE_EXPRESSION (exp->val.args[2]);
|
||
|
|
/* FALLTHROUGH */
|
||
|
|
case 2:
|
||
|
|
FREE_EXPRESSION (exp->val.args[1]);
|
||
|
|
/* FALLTHROUGH */
|
||
|
|
case 1:
|
||
|
|
FREE_EXPRESSION (exp->val.args[0]);
|
||
|
|
/* FALLTHROUGH */
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
free (exp);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static int
|
||
|
|
yylex (lval, pexp)
|
||
|
|
YYSTYPE *lval;
|
||
|
|
const char **pexp;
|
||
|
|
{
|
||
|
|
const char *exp = *pexp;
|
||
|
|
int result;
|
||
|
|
|
||
|
|
while (1)
|
||
|
|
{
|
||
|
|
if (exp[0] == '\0')
|
||
|
|
{
|
||
|
|
*pexp = exp;
|
||
|
|
return YYEOF;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (exp[0] != ' ' && exp[0] != '\t')
|
||
|
|
break;
|
||
|
|
|
||
|
|
++exp;
|
||
|
|
}
|
||
|
|
|
||
|
|
result = *exp++;
|
||
|
|
switch (result)
|
||
|
|
{
|
||
|
|
case '0': case '1': case '2': case '3': case '4':
|
||
|
|
case '5': case '6': case '7': case '8': case '9':
|
||
|
|
{
|
||
|
|
unsigned long int n = result - '0';
|
||
|
|
while (exp[0] >= '0' && exp[0] <= '9')
|
||
|
|
{
|
||
|
|
n *= 10;
|
||
|
|
n += exp[0] - '0';
|
||
|
|
++exp;
|
||
|
|
}
|
||
|
|
lval->num = n;
|
||
|
|
result = NUMBER;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case '=':
|
||
|
|
if (exp[0] == '=')
|
||
|
|
{
|
||
|
|
++exp;
|
||
|
|
lval->op = equal;
|
||
|
|
result = EQUOP2;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
result = YYERRCODE;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case '!':
|
||
|
|
if (exp[0] == '=')
|
||
|
|
{
|
||
|
|
++exp;
|
||
|
|
lval->op = not_equal;
|
||
|
|
result = EQUOP2;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case '&':
|
||
|
|
case '|':
|
||
|
|
if (exp[0] == result)
|
||
|
|
++exp;
|
||
|
|
else
|
||
|
|
result = YYERRCODE;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case '<':
|
||
|
|
if (exp[0] == '=')
|
||
|
|
{
|
||
|
|
++exp;
|
||
|
|
lval->op = less_or_equal;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
lval->op = less_than;
|
||
|
|
result = CMPOP2;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case '>':
|
||
|
|
if (exp[0] == '=')
|
||
|
|
{
|
||
|
|
++exp;
|
||
|
|
lval->op = greater_or_equal;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
lval->op = greater_than;
|
||
|
|
result = CMPOP2;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case '*':
|
||
|
|
lval->op = mult;
|
||
|
|
result = MULOP2;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case '/':
|
||
|
|
lval->op = divide;
|
||
|
|
result = MULOP2;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case '%':
|
||
|
|
lval->op = module;
|
||
|
|
result = MULOP2;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case '+':
|
||
|
|
lval->op = plus;
|
||
|
|
result = ADDOP2;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case '-':
|
||
|
|
lval->op = minus;
|
||
|
|
result = ADDOP2;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 'n':
|
||
|
|
case '?':
|
||
|
|
case ':':
|
||
|
|
case '(':
|
||
|
|
case ')':
|
||
|
|
/* Nothing, just return the character. */
|
||
|
|
break;
|
||
|
|
|
||
|
|
case ';':
|
||
|
|
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 (str)
|
||
|
|
const char *str;
|
||
|
|
{
|
||
|
|
/* Do nothing. We don't print error messages here. */
|
||
|
|
}
|