mirror of
https://github.com/matrix-construct/construct
synced 2024-08-23 18:14:46 +02:00
152 lines
3.9 KiB
C++
152 lines
3.9 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_PARSE_H
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namespace ircd
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{
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struct parse;
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}
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/// NOTE: This interface will likely be removed. It predates the entire
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/// NOTE: ircd::buffer system and only has very few unique qualities left
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/// NOTE: which have not been replicated within ircd::buffer yet.
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///
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struct ircd::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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IRCD_EXCEPTION(error, buffer_error)
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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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struct grammar;
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struct capstan;
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struct buffer;
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};
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struct ircd::parse::buffer
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{
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char *base; // Lowest address of the buffer (const)
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const char *parsed; // Data between [base, parsed] is completed
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char *read; // Data between [parsed, read] is unparsed
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char *stop; // Data between [read, stop] is unreceived (const)
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size_t size() const { return stop - base; }
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size_t completed() const { return parsed - base; }
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size_t unparsed() const { return read - parsed; }
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size_t remaining() const { return stop - read; }
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void discard();
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void remove();
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buffer(const buffer &old, const mutable_buffer &mb)
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:base{data(mb)}
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,parsed{data(mb)}
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,read{data(mb) + old.unparsed()}
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,stop{data(mb) + ircd::size(mb)}
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{
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memmove(base, old.base, old.unparsed());
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}
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buffer(const mutable_buffer &mb)
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:base{data(mb)}
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,parsed{data(mb)}
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,read{data(mb)}
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,stop{data(mb) + ircd::size(mb)}
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{}
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buffer(const const_buffer &cb)
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:base{const_cast<char *>(data(cb))}
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,parsed{data(cb)}
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,read{base + ircd::size(cb)}
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,stop{read}
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{}
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template<size_t N> buffer(const buffer &old, char (&buf)[N])
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:buffer{old, buf}
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{}
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};
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struct ircd::parse::capstan
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{
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const char *&parsed;
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char *&read;
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char *stop;
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size_t unparsed() const { return read - parsed; }
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size_t remaining() const { return stop - read; }
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read_closure reader;
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void operator()(const parse_closure &);
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capstan(const char *&parsed, char *&read, char *const &max, const decltype(reader) &reader = nullptr);
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capstan(buffer &, const decltype(reader) &reader = nullptr);
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};
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inline
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ircd::parse::capstan::capstan(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::capstan::capstan(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::capstan::operator()(const parse_closure &pc)
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try
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{
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while(!pc(parsed, const_cast<const char *>(read)) && read != stop)
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reader(read, stop);
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}
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catch(const std::bad_function_call &e)
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{
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throw panic
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{
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"Invalid parse (parsed:%p read:%p stop:%p unparsed:%zu remaining: %zu)",
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parsed,
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read,
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stop,
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unparsed(),
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remaining()
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};
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}
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inline void
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ircd::parse::buffer::remove()
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{
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memmove(base, parsed, unparsed());
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read = base + unparsed();
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parsed = base;
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}
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inline void
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ircd::parse::buffer::discard()
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{
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read -= unparsed();
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}
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