mirror of
https://github.com/matrix-construct/construct
synced 2024-12-25 06:53:58 +01:00
113 lines
2.8 KiB
C++
113 lines
2.8 KiB
C++
/*
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* charybdis: an advanced ircd.
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* inline/stringops.h: inlined string operations used in a few places
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*
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* Copyright (C) 2005-2016 Charybdis Development Team
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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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#pragma once
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#define HAVE_IRCD_PARAMS_H
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namespace ircd {
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inline namespace util {
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class params
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{
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string_view in;
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const char *sep;
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std::initializer_list<const char *> names;
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const char *name(const size_t &i) const;
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public:
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IRCD_EXCEPTION(ircd::error, error)
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IRCD_EXCEPTION(error, missing)
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IRCD_EXCEPTION(error, invalid)
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string_view operator[](const size_t &i) const; // returns empty
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template<class T> T at(const size_t &i, const T &def) const; // throws invalid
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template<class T> T at(const size_t &i) const; // throws missing or invalid
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string_view at(const size_t &i) const; // throws missing
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params(const string_view &in,
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const char *const &sep,
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const std::initializer_list<const char *> &names = {});
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};
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} // namespace util
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} // namespace ircd
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inline
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ircd::util::params::params(const string_view &in,
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const char *const &sep,
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const std::initializer_list<const char *> &names)
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:in{in}
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,sep{sep}
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,names{names}
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{
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}
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template<class T>
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T
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ircd::util::params::at(const size_t &i,
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const T &def)
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const try
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{
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return tokens_count(in, sep) > i? at<T>(i) : def;
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}
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catch(const bad_lex_cast &e)
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{
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throw invalid("parameter #%zu <%s>", i, name(i));
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}
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template<class T>
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T
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ircd::util::params::at(const size_t &i)
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const try
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{
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return lex_cast<T>(at(i));
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}
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catch(const bad_lex_cast &e)
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{
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throw invalid("parameter #%zu <%s>", i, name(i));
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}
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inline ircd::string_view
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ircd::util::params::at(const size_t &i)
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const try
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{
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return token(in, sep, i);
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}
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catch(const std::out_of_range &e)
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{
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throw missing("required parameter #%zu <%s>", i, name(i));
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}
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inline ircd::string_view
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ircd::util::params::operator[](const size_t &i)
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const
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{
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return tokens_count(in, sep) > i? token(in, sep, i) : string_view{};
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}
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inline const char *
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ircd::util::params::name(const size_t &i)
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const
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{
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return names.size() > i? *std::next(begin(names), i) : "<unnamed>";
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}
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