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
22 #include <language/lexer/format-parser.h>
28 #include <data/format.h>
29 #include <data/variable.h>
30 #include <libpspp/message.h>
31 #include <libpspp/misc.h>
32 #include <libpspp/str.h>
37 #define _(msgid) gettext (msgid)
39 /* Parses a token taking the form of a format specifier and
40 returns true only if successful. Emits an error message on
41 failure. Stores a null-terminated string representing the
42 format type in TYPE, and the width and number of decimal
43 places in *WIDTH and *DECIMALS.
45 TYPE is not checked as to whether it is really the name of a
46 format. Both width and decimals are considered optional. If
47 missing, *WIDTH or *DECIMALS or both will be set to 0. */
49 parse_abstract_format_specifier (char type[FMT_TYPE_LEN_MAX + 1],
50 int *width, int *decimals)
53 struct substring type_ss, width_ss, decimals_ss;
61 ss_get_chars (&s, ss_span (s, ss_cstr (CC_LETTERS)), &type_ss);
62 ss_get_chars (&s, ss_span (s, ss_cstr (CC_DIGITS)), &width_ss);
63 if (ss_match_char (&s, '.'))
66 ss_get_chars (&s, ss_span (s, ss_cstr (CC_DIGITS)), &decimals_ss);
72 if (ss_is_empty (type_ss) || ss_length (type_ss) > FMT_TYPE_LEN_MAX)
74 if (has_decimals && ss_is_empty (decimals_ss))
80 These uses of strtol are valid only because we know that
81 their substrings are followed by non-digit characters. */
82 str_copy_buf_trunc (type, FMT_TYPE_LEN_MAX + 1,
83 ss_data (type_ss), ss_length (type_ss));
84 *width = strtol (ss_data (width_ss), NULL, 10);
85 *decimals = has_decimals ? strtol (ss_data (decimals_ss), NULL, 10) : 0;
91 lex_error (_("expecting valid format specifier"));
95 /* Parses a format specifier from the token stream and returns
96 true only if successful. Emits an error message on
97 failure. The caller should call check_input_specifier() or
98 check_output_specifier() on the parsed format as
101 parse_format_specifier (struct fmt_spec *format)
103 char type[FMT_TYPE_LEN_MAX + 1];
105 if (!parse_abstract_format_specifier (type, &format->w, &format->d))
108 if (!fmt_type_from_string (type, &format->type))
110 msg (SE, _("Unknown format type \"%s\"."), type);
117 /* Parses a token containing just the name of a format type and
118 returns true if successful. */
120 parse_format_specifier_name (int *type)
124 lex_error (_("expecting format type"));
127 if (!fmt_type_from_string (ds_cstr (&tokstr), type))
129 msg (SE, _("Unknown format type \"%s\"."), ds_cstr (&tokstr));