mirror of
https://github.com/matrix-construct/construct
synced 2024-12-27 07:54:05 +01:00
175 lines
4 KiB
C++
175 lines
4 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_CONF_H
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/// Configuration system.
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///
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namespace ircd::conf
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{
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template<class T = void> struct item; // doesn't exist
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template<> struct item<void>; // base class of all conf items
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template<> struct item<std::string>;
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template<> struct item<bool>;
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template<> struct item<uint64_t>;
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template<> struct item<int64_t>;
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template<> struct item<hours>;
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template<> struct item<seconds>;
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template<> struct item<milliseconds>;
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template<> struct item<microseconds>;
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template<class T> struct value; // abstraction for carrying item value
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template<class T> struct lex_castable; // abstraction for lex_cast compatible
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IRCD_EXCEPTION(ircd::error, error)
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IRCD_EXCEPTION(error, not_found)
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IRCD_EXCEPTION(error, bad_value)
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extern const std::string &config; //TODO: X
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extern std::map<string_view, item<> *> items;
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bool exists(const string_view &key);
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string_view get(const string_view &key, const mutable_buffer &out);
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bool set(const string_view &key, const string_view &value);
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bool set(std::nothrow_t, const string_view &key, const string_view &value);
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void init(const string_view &configfile);
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}
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/// Conf item base class. You don't create this directly; use one of the
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/// derived templates instead.
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template<>
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struct ircd::conf::item<void>
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{
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json::strung feature_;
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json::object feature;
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string_view name;
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virtual string_view get(const mutable_buffer &) const;
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virtual bool set(const string_view &);
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item(const json::members &);
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item(item &&) = delete;
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item(const item &) = delete;
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virtual ~item() noexcept;
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};
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/// Conf item value abstraction. If possible, the conf item will also
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/// inherit from this template to deduplicate functionality between
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/// conf items which contain similar classes of values.
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template<class T>
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struct ircd::conf::value
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{
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using value_type = T;
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T _value;
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operator const T &() const
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{
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return _value;
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}
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template<class... A>
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value(A&&... a)
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:_value(std::forward<A>(a)...)
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{}
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};
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template<class T>
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struct ircd::conf::lex_castable
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:conf::item<>
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,conf::value<T>
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{
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string_view get(const mutable_buffer &out) const override
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{
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return lex_cast(this->_value, out);
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}
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bool set(const string_view &s) override
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{
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this->_value = lex_cast<T>(s);
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return true;
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}
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lex_castable(const json::members &members)
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:conf::item<>{members}
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,conf::value<T>(feature.get("default", long(0)))
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{}
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};
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template<>
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struct ircd::conf::item<std::string>
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:conf::item<>
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,conf::value<std::string>
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{
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operator string_view() const
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{
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return _value;
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}
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string_view get(const mutable_buffer &out) const override;
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bool set(const string_view &s) override;
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item(const json::members &members);
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};
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template<>
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struct ircd::conf::item<bool>
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:conf::item<>
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,conf::value<bool>
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{
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string_view get(const mutable_buffer &out) const override;
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bool set(const string_view &s) override;
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item(const json::members &members);
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};
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template<>
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struct ircd::conf::item<uint64_t>
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:lex_castable<uint64_t>
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{
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using lex_castable::lex_castable;
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};
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template<>
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struct ircd::conf::item<int64_t>
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:lex_castable<int64_t>
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{
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using lex_castable::lex_castable;
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};
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template<>
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struct ircd::conf::item<ircd::hours>
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:lex_castable<ircd::hours>
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{
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using lex_castable::lex_castable;
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};
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template<>
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struct ircd::conf::item<ircd::seconds>
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:lex_castable<ircd::seconds>
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{
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using lex_castable::lex_castable;
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};
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template<>
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struct ircd::conf::item<ircd::milliseconds>
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:lex_castable<ircd::milliseconds>
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{
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using lex_castable::lex_castable;
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};
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template<>
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struct ircd::conf::item<ircd::microseconds>
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:lex_castable<ircd::microseconds>
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{
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using lex_castable::lex_castable;
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};
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