2 Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
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 2 of the License, or
7 (at your option) any later version.
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.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 using boost::optional;
29 /** @param s A string.
30 * @return true if the string contains only space, newline or tab characters, or is empty.
33 sub::empty_or_white_space (string s)
35 for (size_t i = 0; i < s.length(); ++i) {
36 if (s[i] != ' ' && s[i] != '\n' && s[i] != '\t') {
45 sub::get_line_string (string* s)
47 if (s->length() == 0) {
48 return optional<string>();
51 size_t pos = s->find ("\n");
52 if (pos == string::npos) {
58 string const c = s->substr (0, pos);
59 s->erase (0, pos + 1);
64 sub::get_line_file (FILE* f)
67 char* r = fgets (buffer, sizeof (buffer), f);
69 return optional<string> ();
72 return string (buffer);
76 sub::remove_unicode_bom (optional<string>& line)
79 line->length() >= 3 &&
80 static_cast<unsigned char> (line.get()[0]) == 0xef &&
81 static_cast<unsigned char> (line.get()[1]) == 0xbb &&
82 static_cast<unsigned char> (line.get()[2]) == 0xbf
85 /* Skip Unicode byte order mark */
86 line = line->substr (3);