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/*
* Copyright 2003-2020 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.
*/
#ifndef MPD_UTIL_OPTIONPARSER_HXX
#define MPD_UTIL_OPTIONPARSER_HXX
#include "util/ConstBuffer.hxx"
class OptionDef;
/**
* Command line option parser.
*/
class OptionParser
{
ConstBuffer<OptionDef> options;
ConstBuffer<const char *> args;
const char **const remaining_head, **remaining_tail;
public:
/**
* Constructs #OptionParser.
*/
OptionParser(ConstBuffer<OptionDef> _options,
int _argc, char **_argv) noexcept
:options(_options), args(_argv + 1, _argc - 1),
remaining_head(const_cast<const char **>(_argv + 1)),
remaining_tail(remaining_head) {}
struct Result {
int index;
const char *value;
constexpr operator bool() noexcept {
return index >= 0;
}
};
/**
* Parses current command line entry.
* Regardless of result, advances current position to the next
* command line entry.
*
* Throws on error.
*/
Result Next();
/**
* Returns the remaining non-option arguments.
*/
ConstBuffer<const char *> GetRemaining() const noexcept {
return {remaining_head, remaining_tail};
}
private:
const char *CheckShiftValue(const char *s, const OptionDef &option);
Result IdentifyOption(const char *s);
};
#endif
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