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., 51 Franklin Street, Fifth Floor, Boston, MA
21 #include <sys/types.h>
31 #include "sort-criteria.h"
35 #define _(msgid) gettext (msgid)
37 static bool is_terminator(int tok, const int *terminators);
40 /* Parses a list of sort keys and returns a struct sort_criteria
41 based on it. Returns a null pointer on error.
42 If SAW_DIRECTION is nonnull, sets *SAW_DIRECTION to true if at
43 least one parenthesized sort direction was specified, false
45 If TERMINATORS is non-null, then it must be a pointer to a
46 null terminated list of tokens, in addition to the defaults,
47 which are to be considered terminators of the clause being parsed.
48 The default terminators are '/' and '.'
51 struct sort_criteria *
52 sort_parse_criteria (const struct dictionary *dict,
53 struct variable ***vars, size_t *var_cnt,
55 const int *terminators
58 struct sort_criteria *criteria;
59 struct variable **local_vars = NULL;
62 assert ((vars == NULL) == (var_cnt == NULL));
66 var_cnt = &local_var_cnt;
69 criteria = xmalloc (sizeof *criteria);
70 criteria->crits = NULL;
71 criteria->crit_cnt = 0;
75 if (saw_direction != NULL)
76 *saw_direction = false;
80 size_t prev_var_cnt = *var_cnt;
81 enum sort_direction direction;
84 if (!parse_variables (dict, vars, var_cnt,
85 PV_NO_DUPLICATE | PV_APPEND | PV_NO_SCRATCH))
91 if (lex_match_id ("D") || lex_match_id ("DOWN"))
92 direction = SRT_DESCEND;
93 else if (lex_match_id ("A") || lex_match_id ("UP"))
94 direction = SRT_ASCEND;
97 msg (SE, _("`A' or `D' expected inside parentheses."));
100 if (!lex_match (')'))
102 msg (SE, _("`)' expected."));
105 if (saw_direction != NULL)
106 *saw_direction = true;
109 direction = SRT_ASCEND;
111 criteria->crits = xnrealloc (criteria->crits,
112 *var_cnt, sizeof *criteria->crits);
113 criteria->crit_cnt = *var_cnt;
114 for (; prev_var_cnt < criteria->crit_cnt; prev_var_cnt++)
116 struct sort_criterion *c = &criteria->crits[prev_var_cnt];
117 c->fv = (*vars)[prev_var_cnt]->fv;
118 c->width = (*vars)[prev_var_cnt]->width;
122 while (token != '.' && token != '/' && !is_terminator(token, terminators));
129 sort_destroy_criteria (criteria);
133 /* Return TRUE if TOK is a member of the list of TERMINATORS.
136 is_terminator(int tok, const int *terminators)
138 if (terminators == NULL )
141 while ( *terminators)
143 if (tok == *terminators++)
152 /* Destroys a SORT CASES program. */
154 sort_destroy_criteria (struct sort_criteria *criteria)
156 if (criteria != NULL)
158 free (criteria->crits);