1 /* PSPP - computes sample statistics.
2 Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
3 Written by Ben Pfaff <blp@gnu.org>.
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
23 /* Expression parsing flags. */
26 PXP_NONE = 000, /* No flags. */
27 PXP_DUMP = 001, /* Dump postfix representation to screen;
28 only for use by EVALUATE. */
30 /* Specify expression type. */
31 PXP_BOOLEAN = 002, /* Coerce return value to Boolean. */
32 PXP_NUMERIC = 004, /* Must be numeric result type. */
33 PXP_STRING = 010 /* Must be string result type. */
40 struct expression *expr_parse (int flags);
41 double expr_evaluate (struct expression *, struct ccase *, union value *);
42 void expr_free (struct expression *);