1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000, 2006, 2010, 2011, 2012 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
16
17 #include <config.h>
18
19 #include <ctype.h>
20 #include <stdint.h>
21 #include <stdlib.h>
22
23 #include "data/format.h"
24 #include "data/variable.h"
25 #include "language/lexer/format-parser.h"
26 #include "language/lexer/lexer.h"
27 #include "libpspp/message.h"
28 #include "libpspp/misc.h"
29 #include "libpspp/str.h"
30
31 #include "gettext.h"
32 #define _(msgid) gettext (msgid)
33
34 static bool
parse_abstract_format_specifier__(struct lexer * lexer,char type[FMT_TYPE_LEN_MAX+1],int * width,int * decimals)35 parse_abstract_format_specifier__ (struct lexer *lexer,
36 char type[FMT_TYPE_LEN_MAX + 1],
37 int *width, int *decimals)
38 {
39 struct substring s;
40 struct substring type_ss, width_ss, decimals_ss;
41 bool has_decimals;
42
43 if (lex_token (lexer) != T_ID && lex_token (lexer) != T_STRING)
44 goto error;
45
46 /* Extract pieces. */
47 s = ss_cstr (lex_tokcstr (lexer));
48 ss_get_bytes (&s, ss_span (s, ss_cstr (CC_LETTERS)), &type_ss);
49 ss_get_bytes (&s, ss_span (s, ss_cstr (CC_DIGITS)), &width_ss);
50 if (ss_match_byte (&s, '.'))
51 {
52 has_decimals = true;
53 ss_get_bytes (&s, ss_span (s, ss_cstr (CC_DIGITS)), &decimals_ss);
54 }
55 else
56 has_decimals = false;
57
58 /* Check pieces. */
59 if (ss_is_empty (type_ss) || ss_length (type_ss) > FMT_TYPE_LEN_MAX)
60 goto error;
61 if (has_decimals && ss_is_empty (decimals_ss))
62 goto error;
63 if (!ss_is_empty (s))
64 goto error;
65
66 /* Return pieces.
67 These uses of strtol are valid only because we know that
68 their substrings are followed by non-digit characters. */
69 str_copy_buf_trunc (type, FMT_TYPE_LEN_MAX + 1,
70 ss_data (type_ss), ss_length (type_ss));
71 *width = strtol (ss_data (width_ss), NULL, 10);
72 *decimals = has_decimals ? strtol (ss_data (decimals_ss), NULL, 10) : 0;
73
74 return true;
75
76 error:
77 lex_error (lexer, _("expecting valid format specifier"));
78 return false;
79 }
80
81 /* Parses a token taking the form of a format specifier and
82 returns true only if successful. Emits an error message on
83 failure. Stores a null-terminated string representing the
84 format type in TYPE, and the width and number of decimal
85 places in *WIDTH and *DECIMALS.
86
87 TYPE is not checked as to whether it is really the name of a
88 format. Both width and decimals are considered optional. If
89 missing, *WIDTH or *DECIMALS or both will be set to 0. */
90 bool
parse_abstract_format_specifier(struct lexer * lexer,char type[FMT_TYPE_LEN_MAX+1],int * width,int * decimals)91 parse_abstract_format_specifier (struct lexer *lexer,
92 char type[FMT_TYPE_LEN_MAX + 1],
93 int *width, int *decimals)
94 {
95 bool ok = parse_abstract_format_specifier__ (lexer, type, width, decimals);
96 if (ok)
97 lex_get (lexer);
98 return ok;
99 }
100
101 /* Parses a format specifier from the token stream and returns
102 true only if successful. Emits an error message on
103 failure. The caller should call check_input_specifier() or
104 check_output_specifier() on the parsed format as
105 necessary. */
106 bool
parse_format_specifier(struct lexer * lexer,struct fmt_spec * format)107 parse_format_specifier (struct lexer *lexer, struct fmt_spec *format)
108 {
109 char type[FMT_TYPE_LEN_MAX + 1];
110
111 if (!parse_abstract_format_specifier__ (lexer, type, &format->w, &format->d))
112 return false;
113
114 if (!fmt_from_name (type, &format->type))
115 {
116 msg (SE, _("Unknown format type `%s'."), type);
117 return false;
118 }
119
120 if (format->w == 0 && !strchr (lex_tokcstr (lexer), '0'))
121 {
122 msg (SE, _("Format specifier `%s' lacks required width."),
123 lex_tokcstr (lexer));
124 return false;
125 }
126
127 lex_get (lexer);
128 return true;
129 }
130
131 /* Parses a token containing just the name of a format type and
132 returns true if successful. */
133 bool
parse_format_specifier_name(struct lexer * lexer,enum fmt_type * type)134 parse_format_specifier_name (struct lexer *lexer, enum fmt_type *type)
135 {
136 if (lex_token (lexer) != T_ID)
137 {
138 lex_error (lexer, _("expecting format type"));
139 return false;
140 }
141 if (!fmt_from_name (lex_tokcstr (lexer), type))
142 {
143 msg (SE, _("Unknown format type `%s'."), lex_tokcstr (lexer));
144 return false;
145 }
146 lex_get (lexer);
147 return true;
148 }
149