mirror of
https://git.lyx.org/repos/lyx.git
synced 2024-11-27 11:52:25 +00:00
109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
|
/* Plural expression evaluation.
|
||
|
|
Copyright (C) 2000-2003 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
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. */
|
||
|
|
|
||
|
|
#ifndef STATIC
|
||
|
|
#define STATIC static
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Evaluate the plural expression and return an index value. */
|
||
|
|
STATIC
|
||
|
|
unsigned long int
|
||
|
|
internal_function
|
||
|
|
plural_eval (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:
|
||
|
|
#if !INTDIV0_RAISES_SIGFPE
|
||
|
|
if (rightarg == 0)
|
||
|
|
raise (SIGFPE);
|
||
|
|
#endif
|
||
|
|
return leftarg / rightarg;
|
||
|
|
case module:
|
||
|
|
#if !INTDIV0_RAISES_SIGFPE
|
||
|
|
if (rightarg == 0)
|
||
|
|
raise (SIGFPE);
|
||
|
|
#endif
|
||
|
|
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;
|
||
|
|
}
|