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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "OptionParser.hxx"
#include "OptionDef.hxx"
#include "util/RuntimeError.hxx"
#include "util/StringCompare.hxx"
inline const char *
OptionParser::CheckShiftValue(const char *s, const OptionDef &option)
{
if (!option.HasValue())
return nullptr;
if (args.empty())
throw FormatRuntimeError("Value expected after %s", s);
return args.shift();
}
inline OptionParser::Result
OptionParser::IdentifyOption(const char *s)
{
assert(s != nullptr);
assert(*s == '-');
if (s[1] == '-') {
for (const auto &i : options) {
if (!i.HasLongOption())
continue;
const char *t = StringAfterPrefix(s + 2, i.GetLongOption());
if (t == nullptr)
continue;
const char *value;
if (*t == 0)
value = CheckShiftValue(s, i);
else if (*t == '=')
value = t + 1;
else
continue;
return {int(&i - options.data), value};
}
} else if (s[1] != 0 && s[2] == 0) {
const char ch = s[1];
for (const auto &i : options) {
if (i.HasShortOption() && ch == i.GetShortOption()) {
const char *value = CheckShiftValue(s, i);
return {int(&i - options.data), value};
}
}
}
throw FormatRuntimeError("Unknown option: %s", s);
}
OptionParser::Result
OptionParser::Next()
{
while (!args.empty()) {
const char *arg = args.shift();
if (arg[0] == '-')
return IdentifyOption(arg);
*remaining_tail++ = arg;
}
return {-1, nullptr};
}
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