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/*
Copyright (C) 2014-2015 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "iso6937_tables.h"
#include "iso6937.h"
#include <boost/optional.hpp>
#include <boost/locale.hpp>
#include <string>
#include <iostream>
using std::string;
using std::cout;
using std::wcout;
using std::wstring;
using std::map;
using boost::optional;
using boost::locale::conv::utf_to_utf;
using namespace sub;
wstring
sub::iso6937_to_utf16 (string s)
{
if (iso6937::diacriticals.empty ()) {
make_iso6937_tables ();
}
wstring o;
boost::optional<unsigned char> diacritical;
int i = 0;
while (s[i] != '\0') {
unsigned char const u = static_cast<unsigned char> (s[i]);
if (u >= 0xc1 && u <= 0xcf) {
diacritical = u;
} else if (diacritical) {
o += (*iso6937::diacriticals[diacritical.get()])[u];
diacritical.reset ();
} else {
o += iso6937::main[u];
}
++i;
}
return o;
}
static optional<char>
find (map<char, wchar_t> const & m, wchar_t c)
{
for (map<char, wchar_t>::const_iterator i = m.begin(); i != m.end(); ++i) {
if (i->second == c) {
return i->first;
}
}
return optional<char> ();
}
string
sub::utf16_to_iso6937 (wstring s)
{
if (iso6937::diacriticals.empty ()) {
make_iso6937_tables ();
}
/* XXX: slow */
string o;
for (size_t i = 0; i < s.size(); ++i) {
optional<char> c = find (iso6937::main, s[i]);
if (c) {
o += c.get ();
} else {
for (map<char, map<char, wchar_t> *>::const_iterator j = iso6937::diacriticals.begin(); j != iso6937::diacriticals.end(); ++j) {
c = find (*(j->second), s[i]);
if (c) {
o += j->first;
o += c.get ();
break;
}
}
}
}
return o;
}
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