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 EXPR_ANY = 0, /* Any type. */
27 EXPR_BOOLEAN = 1, /* Must be numeric; coerce to Boolean. */
28 EXPR_NUMERIC = 2, /* Must be numeric result type. */
29 EXPR_STRING = 3, /* Must be string result type. */
30 EXPR_ERROR = 4, /* Indicates an error. */
31 EXPR_NO_OPTIMIZE = 0x1000 /* May be set in expr_parse()
32 argument to disable optimization. */
39 struct expression *expr_parse (enum expr_type);
40 enum expr_type expr_get_type (const struct expression *);
41 double expr_evaluate (const struct expression *, const struct ccase *,
42 int case_idx, union value *);
43 void expr_free (struct expression *);
44 void expr_debug_print_postfix (const struct expression *);