mirror of
https://github.com/matrix-construct/construct
synced 2024-09-12 19:49:19 +02:00
119 lines
2.9 KiB
C++
119 lines
2.9 KiB
C++
/*
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* charybdis: 21st Century IRC++d
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*
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* Copyright (C) 2016 Charybdis Development Team
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* Copyright (C) 2016 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.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#pragma once
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#define HAVE_IRCD_PARSE_H
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namespace ircd {
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struct parse
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{
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IRCD_EXCEPTION(ircd::error, error)
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IRCD_EXCEPTION(error, grammar_error)
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IRCD_EXCEPTION(error, syntax_error)
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struct grammar;
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struct context;
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struct buffer;
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};
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struct parse::grammar
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{
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static std::map<std::string_view, const grammar *> grammars;
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const char *const name;
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private:
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decltype(grammars)::const_iterator grammars_it;
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public:
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grammar(const char *const &name);
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~grammar() noexcept;
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};
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struct parse::buffer
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{
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char *base;
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const char *parsed;
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char *read;
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char *stop;
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buffer(char *const &start, char *const &stop)
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:base{start}
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,parsed{start}
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,read{start}
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,stop{stop}
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{}
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template<size_t N> buffer(char (&buf)[N])
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:buffer{buf, buf + N}
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{}
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};
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struct parse::context
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{
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using read_closure = std::function<void (char *&, char *)>;
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using parse_closure = std::function<bool (const char *&, const char *)>;
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const char *&parsed;
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char *&read;
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char *stop;
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read_closure reader;
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void operator()(const parse_closure &);
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context(const char *&parsed, char *&read, char *const &max, const decltype(reader) &reader = nullptr);
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context(buffer &, const decltype(reader) &reader = nullptr);
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};
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} // namespace ircd
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inline
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ircd::parse::context::context(buffer &buffer,
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const decltype(reader) &reader)
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:parsed{buffer.parsed}
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,read{buffer.read}
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,stop{buffer.stop}
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,reader{reader}
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{
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}
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inline
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ircd::parse::context::context(const char *&parsed,
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char *&read,
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char *const &max,
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const decltype(reader) &reader)
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:parsed{parsed}
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,read{read}
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,stop{max}
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,reader{reader}
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{
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}
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inline void
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ircd::parse::context::operator()(const parse_closure &pc)
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{
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while(!pc(parsed, const_cast<const char *>(read)))
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reader(read, stop);
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}
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