63 lines
1.3 KiB
C++
63 lines
1.3 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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#ifndef MPD_UTIL_OPTIONPARSER_HXX
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#define MPD_UTIL_OPTIONPARSER_HXX
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#include "OptionDef.hxx"
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#include <span>
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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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std::span<const OptionDef> options;
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std::span<const char *const> 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(std::span<const 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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std::span<const char *const> 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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