89 lines
2.1 KiB
C++
89 lines
2.1 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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#include "OptionParser.hxx"
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#include "OptionDef.hxx"
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#include "util/RuntimeError.hxx"
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#include "util/StringCompare.hxx"
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inline const char *
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OptionParser::CheckShiftValue(const char *s, const OptionDef &option)
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{
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if (!option.HasValue())
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return nullptr;
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if (args.empty())
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throw FormatRuntimeError("Value expected after %s", s);
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return args.shift();
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}
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inline OptionParser::Result
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OptionParser::IdentifyOption(const char *s)
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{
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assert(s != nullptr);
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assert(*s == '-');
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if (s[1] == '-') {
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for (const auto &i : options) {
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if (!i.HasLongOption())
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continue;
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const char *t = StringAfterPrefix(s + 2, i.GetLongOption());
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if (t == nullptr)
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continue;
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const char *value;
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if (*t == 0)
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value = CheckShiftValue(s, i);
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else if (*t == '=')
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value = t + 1;
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else
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continue;
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return {int(&i - options.data), value};
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}
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} else if (s[1] != 0 && s[2] == 0) {
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const char ch = s[1];
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for (const auto &i : options) {
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if (i.HasShortOption() && ch == i.GetShortOption()) {
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const char *value = CheckShiftValue(s, i);
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return {int(&i - options.data), value};
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}
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}
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}
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throw FormatRuntimeError("Unknown option: %s", s);
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}
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OptionParser::Result
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OptionParser::Next()
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{
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while (!args.empty()) {
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const char *arg = args.shift();
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if (arg[0] == '-')
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return IdentifyOption(arg);
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*remaining_tail++ = arg;
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}
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return {-1, nullptr};
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}
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