Rocco Rutte:

[apps/madmutt.git] / intl / eval-plural.h

diff --git a/intl/eval-plural.h b/intl/eval-plural.h
new file mode 100644 (file)
index 0000000..dacd003
--- /dev/null
+++ b/intl/eval-plural.h
@@ -0,0 +1,108 @@
+/* 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;
+}