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glibc/intl/plural-eval.c
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/* Plural expression evaluation. | |
Copyright (C) 2000, 2001, 2007 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library 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. | |
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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
static unsigned long int plural_eval (const struct expression *pexp, | |
unsigned long int n) | |
internal_function; | |
static unsigned long int | |
internal_function | |
plural_eval (pexp, n) | |
const struct expression *pexp; | |
unsigned long int n; | |
{ | |
switch (pexp->nargs) | |
{ | |
case 0: | |
switch (pexp->operation) | |
{ | |
case var: | |
return n; | |
case num: | |
return pexp->val.num; | |
default: | |
break; | |
} | |
/* NOTREACHED */ | |
break; | |
case 1: | |
{ | |
/* pexp->operation must be lnot. */ | |
unsigned long int arg = plural_eval (pexp->val.args[0], n); | |
return ! arg; | |
} | |
case 2: | |
{ | |
unsigned long int leftarg = plural_eval (pexp->val.args[0], n); | |
if (pexp->operation == lor) | |
return leftarg || plural_eval (pexp->val.args[1], n); | |
else if (pexp->operation == land) | |
return leftarg && plural_eval (pexp->val.args[1], n); | |
else | |
{ | |
unsigned long int rightarg = plural_eval (pexp->val.args[1], n); | |
switch (pexp->operation) | |
{ | |
case mult: | |
return leftarg * rightarg; | |
case divide: | |
return leftarg / rightarg; | |
case module: | |
return leftarg % rightarg; | |
case plus: | |
return leftarg + rightarg; | |
case minus: | |
return leftarg - rightarg; | |
case less_than: | |
return leftarg < rightarg; | |
case greater_than: | |
return leftarg > rightarg; | |
case less_or_equal: | |
return leftarg <= rightarg; | |
case greater_or_equal: | |
return leftarg >= rightarg; | |
case equal: | |
return leftarg == rightarg; | |
case not_equal: | |
return leftarg != rightarg; | |
default: | |
break; | |
} | |
} | |
/* NOTREACHED */ | |
break; | |
} | |
case 3: | |
{ | |
/* pexp->operation must be qmop. */ | |
unsigned long int boolarg = plural_eval (pexp->val.args[0], n); | |
return plural_eval (pexp->val.args[boolarg ? 1 : 2], n); | |
} | |
} | |
/* NOTREACHED */ | |
return 0; | |
} |