mirror of
https://github.com/matrix-construct/construct
synced 2024-10-30 18:39:02 +01:00
111 lines
2.5 KiB
C++
111 lines
2.5 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_UTIL_PARAMS_H
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// This file is not part of the standard include stack. It is included
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// manually as needed.
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namespace ircd::util
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{
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struct params;
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}
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class ircd::util::params
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{
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string_view in;
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const char *sep;
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std::vector<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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size_t count() const;
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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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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 count() > 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 count() > i? token(in, sep, i) : string_view{};
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}
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inline size_t
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ircd::util::params::count()
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const
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{
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return token_count(in, sep);
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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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