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 std::stringstream;
29 using boost::optional;
31 /** @param s A string.
32 * @return true if the string contains only space, newline or tab characters, or is empty.
35 sub::empty_or_white_space (string s)
37 for (size_t i = 0; i < s.length(); ++i) {
38 if (s[i] != ' ' && s[i] != '\n' && s[i] != '\t') {
47 sub::get_line_stringstream (stringstream* str)
50 return optional<string> ();
59 sub::get_line_file (FILE* f)
62 char* r = fgets (buffer, sizeof (buffer), f);
64 return optional<string> ();
67 return string (buffer);
71 sub::remove_unicode_bom (optional<string>& line)
74 line->length() >= 3 &&
75 static_cast<unsigned char> (line.get()[0]) == 0xef &&
76 static_cast<unsigned char> (line.get()[1]) == 0xbb &&
77 static_cast<unsigned char> (line.get()[2]) == 0xbf
80 /* Skip Unicode byte order mark */
81 line = line->substr (3);