79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
/*
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* Copyright 2003-2021 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_UTIL_OPTIONPARSER_HXX
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#define MPD_UTIL_OPTIONPARSER_HXX
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#include "util/ConstBuffer.hxx"
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class OptionDef;
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/**
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* Command line option parser.
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*/
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class OptionParser
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{
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ConstBuffer<OptionDef> options;
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ConstBuffer<const char *> args;
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const char **const remaining_head, **remaining_tail;
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public:
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/**
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* Constructs #OptionParser.
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*/
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OptionParser(ConstBuffer<OptionDef> _options,
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int _argc, char **_argv) noexcept
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:options(_options), args(_argv + 1, _argc - 1),
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remaining_head(const_cast<const char **>(_argv + 1)),
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remaining_tail(remaining_head) {}
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struct Result {
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int index;
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const char *value;
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constexpr operator bool() const noexcept {
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return index >= 0;
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}
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};
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/**
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* Parses current command line entry.
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* Regardless of result, advances current position to the next
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* command line entry.
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*
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* Throws on error.
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*/
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Result Next();
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/**
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* Returns the remaining non-option arguments.
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*/
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ConstBuffer<const char *> GetRemaining() const noexcept {
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return {remaining_head, remaining_tail};
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}
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private:
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const char *CheckShiftValue(const char *s, const OptionDef &option);
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Result IdentifyOption(const char *s);
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};
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#endif
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