1 /* Plural expression evaluation.
2 Copyright (C) 2000-2003 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU Library General Public License as published
6 by the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
25 /* Evaluate the plural expression and return an index value. */
29 plural_eval (struct expression *pexp, unsigned long int n)
34 switch (pexp->operation)
47 /* pexp->operation must be lnot. */
48 unsigned long int arg = plural_eval (pexp->val.args[0], n);
53 unsigned long int leftarg = plural_eval (pexp->val.args[0], n);
54 if (pexp->operation == lor)
55 return leftarg || plural_eval (pexp->val.args[1], n);
56 else if (pexp->operation == land)
57 return leftarg && plural_eval (pexp->val.args[1], n);
60 unsigned long int rightarg = plural_eval (pexp->val.args[1], n);
62 switch (pexp->operation)
65 return leftarg * rightarg;
69 return leftarg / rightarg;
73 return leftarg % rightarg;
75 return leftarg + rightarg;
77 return leftarg - rightarg;
79 return leftarg < rightarg;
81 return leftarg > rightarg;
83 return leftarg <= rightarg;
84 case greater_or_equal:
85 return leftarg >= rightarg;
87 return leftarg == rightarg;
89 return leftarg != rightarg;
99 /* pexp->operation must be qmop. */
100 unsigned long int boolarg = plural_eval (pexp->val.args[0], n);
101 return plural_eval (pexp->val.args[boolarg ? 1 : 2], n);