102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
/* Plural expression evaluation.
|
|
Copyright (C) 2000, 2001 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 (struct expression *pexp,
|
|
unsigned long int n)
|
|
internal_function;
|
|
|
|
static unsigned long int
|
|
internal_function
|
|
plural_eval (pexp, n)
|
|
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;
|
|
}
|