Edit: /usr/share/gettext/intl/plural.y (7516B)
%{
/* Expression parsing for plural form selection.
Copyright (C) 2000-2016 Free Software Foundation, Inc.
Written by Ulrich Drepper
, 2000.
This program 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 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see . */
/* For bison < 2.0, 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
because may include arbitrary system headers.
This can go away once the AM_INTL_SUBDIR macro requires bison >= 2.0. */
#if defined _AIX && !defined __GNUC__
#pragma alloca
#endif
#ifdef HAVE_CONFIG_H
# include
#endif
#include
#include
#include
#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
%}
%parse-param {struct parse_args *arg}
%lex-param {struct parse_args *arg}
%define api.pure full
%expect 7
%union {
unsigned long int num;
enum expression_operator op;
struct expression *exp;
}
%{
/* Prototypes for local functions. */
static int yylex (YYSTYPE *lval, struct parse_args *arg);
static void yyerror (struct parse_args *arg, const char *str);
/* Allocation of expressions. */
static struct expression *
new_exp (int nargs, enum expression_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 (enum expression_operator op)
{
return new_exp (0, op, NULL);
}
static inline struct expression *
new_exp_1 (enum expression_operator op, struct expression *right)
{
struct expression *args[1];
args[0] = right;
return new_exp (1, op, args);
}
static struct expression *
new_exp_2 (enum expression_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 (enum expression_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 EQUOP2 CMPOP2 ADDOP2 MULOP2
%token NUMBER
%type exp
%%
start: exp
{
if ($1 == NULL)
YYABORT;
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 (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 (YYSTYPE *lval, struct parse_args *arg)
{
const char *exp = arg->cp;
int result;
while (1)
{
if (exp[0] == '\0')
{
arg->cp = 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;
}
arg->cp = exp;
return result;
}
static void
yyerror (struct parse_args *arg, const char *str)
{
/* Do nothing. We don't print error messages here. */
}