-
-/* Function to evaluate the plural expression and return an index value. */
-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;
-}
-
-