mirror of
https://github.com/matrix-construct/construct
synced 2024-08-22 09:34:45 +02:00
455 lines
9.6 KiB
C++
455 lines
9.6 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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/// !!! NOTE !!!
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///
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/// Many functions implemented here need to be replaced with karma generators
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/// similar to ircd::fmt. Both the boost and std lexical conversions are an
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/// order of magnitude slower than the formal generators. Some tokenizations
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/// can also be replaced.
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///
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#include <boost/lexical_cast.hpp>
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decltype(ircd::LEX_CAST_BUFS)
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ircd::LEX_CAST_BUFS
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{
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64 // plenty
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};
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decltype(ircd::LEX_CAST_BUFSIZE)
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ircd::LEX_CAST_BUFSIZE
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{
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64
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};
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namespace ircd
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{
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/// This is a static "ring buffer" to simplify a majority of lex_cast uses.
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/// If the lex_cast has binary input and string output, and no user buffer
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/// is supplied, the next buffer here will be used instead. The returned
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/// string_view of data from this buffer is only valid for several more
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/// calls to lex_cast before it is overwritten.
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thread_local char lex_cast_buf[LEX_CAST_BUFS][LEX_CAST_BUFSIZE];
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thread_local uint lex_cast_cur;
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[[noreturn]] static void throw_bad_lex_cast(const boost::bad_lexical_cast &, const std::type_info &);
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template<size_t N, class T> static string_view _lex_cast(const T &i, mutable_buffer buf);
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template<class T> static T _lex_cast(const string_view &s);
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}
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/// Internal template providing conversions from a number to a string;
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/// potentially using the ring buffer if no user buffer is supplied.
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template<size_t N,
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class T>
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ircd::string_view
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ircd::_lex_cast(const T &i,
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mutable_buffer buf)
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try
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{
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using array = std::array<char, N>;
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if(!buf)
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{
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buf = lex_cast_buf[lex_cast_cur++];
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lex_cast_cur %= LEX_CAST_BUFS;
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}
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assert(size(buf) >= N);
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auto &a(*reinterpret_cast<array *>(data(buf)));
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a = boost::lexical_cast<array>(i);
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return { data(buf), strnlen(data(buf), size(buf)) };
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}
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catch(const boost::bad_lexical_cast &e)
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{
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throw_bad_lex_cast(e, typeid(T));
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}
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/// Internal template providing conversions from a string to a number;
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/// the native object is returned directly; no ring buffer is consumed.
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template<class T>
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T
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ircd::_lex_cast(const string_view &s)
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try
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{
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return boost::lexical_cast<T>(data(s), size(s));
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}
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catch(const boost::bad_lexical_cast &e)
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{
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throw_bad_lex_cast(e, typeid(T));
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}
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void
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ircd::throw_bad_lex_cast(const boost::bad_lexical_cast &e,
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const std::type_info &t)
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{
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throw ircd::bad_lex_cast
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{
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"%s: %s", e.what(), demangle(t.name())
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};
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}
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template<> ircd::string_view
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ircd::lex_cast(bool i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(8);
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return _lex_cast<MAX>(i, buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(int8_t i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(8);
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return _lex_cast<MAX>(i, buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(uint8_t i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(8);
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return _lex_cast<MAX>(i, buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(short i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(8);
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return _lex_cast<MAX>(i, buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(ushort i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(8);
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return _lex_cast<MAX>(i, buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(int i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(16);
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return _lex_cast<MAX>(i, buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(uint i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(16);
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return _lex_cast<MAX>(i, buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(long i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(32);
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return _lex_cast<MAX>(i, buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(ulong i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(32);
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return _lex_cast<MAX>(i, buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(double i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(64);
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return _lex_cast<MAX>(i, buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(long double i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(64);
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return _lex_cast<MAX>(i, buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(nanoseconds i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(64);
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return _lex_cast<MAX>(i.count(), buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(microseconds i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(64);
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return _lex_cast<MAX>(i.count(), buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(milliseconds i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(64);
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return _lex_cast<MAX>(i.count(), buf);
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}
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template<> ircd::string_view
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ircd::lex_cast(seconds i,
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const mutable_buffer &buf)
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{
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static const size_t MAX(64);
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return _lex_cast<MAX>(i.count(), buf);
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}
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template<> bool
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ircd::lex_cast(const string_view &s)
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{
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return s == "true"? true:
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s == "false"? false:
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_lex_cast<bool>(s);
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}
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template<> int8_t
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ircd::lex_cast(const string_view &s)
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{
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return _lex_cast<char>(s);
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}
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template<> uint8_t
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ircd::lex_cast(const string_view &s)
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{
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return _lex_cast<unsigned char>(s);
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}
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template<> short
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ircd::lex_cast(const string_view &s)
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{
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return _lex_cast<short>(s);
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}
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template<> unsigned short
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ircd::lex_cast(const string_view &s)
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{
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return _lex_cast<unsigned short>(s);
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}
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template<> int
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ircd::lex_cast(const string_view &s)
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{
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return _lex_cast<int>(s);
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}
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template<> unsigned int
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ircd::lex_cast(const string_view &s)
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{
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return _lex_cast<unsigned int>(s);
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}
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template<> long
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ircd::lex_cast(const string_view &s)
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{
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return _lex_cast<long>(s);
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}
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template<> unsigned long
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ircd::lex_cast(const string_view &s)
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{
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return _lex_cast<unsigned long>(s);
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}
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template<> double
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ircd::lex_cast(const string_view &s)
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{
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return _lex_cast<double>(s);
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}
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template<> long double
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ircd::lex_cast(const string_view &s)
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{
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return _lex_cast<long double>(s);
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}
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template<> ircd::nanoseconds
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ircd::lex_cast(const string_view &s)
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{
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return std::chrono::duration<time_t, std::ratio<1L, 1000000000L>>(_lex_cast<time_t>(s));
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}
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template<> ircd::microseconds
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ircd::lex_cast(const string_view &s)
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{
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return std::chrono::duration<time_t, std::ratio<1L, 1000000L>>(_lex_cast<time_t>(s));
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}
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template<> ircd::milliseconds
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ircd::lex_cast(const string_view &s)
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{
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return std::chrono::duration<time_t, std::ratio<1L, 1000L>>(_lex_cast<time_t>(s));
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}
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template<> ircd::seconds
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ircd::lex_cast(const string_view &s)
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{
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return std::chrono::duration<time_t, std::ratio<1L, 1L>>(_lex_cast<time_t>(s));
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}
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template<> bool
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ircd::try_lex_cast<bool>(const string_view &s)
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{
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bool i;
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<int8_t>(const string_view &s)
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{
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int8_t i;
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<uint8_t>(const string_view &s)
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{
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uint8_t i;
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<short>(const string_view &s)
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{
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short i;
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<ushort>(const string_view &s)
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{
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ushort i;
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<int>(const string_view &s)
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{
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int i;
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<unsigned int>(const string_view &s)
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{
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unsigned int i;
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<long>(const string_view &s)
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{
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long i;
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<unsigned long>(const string_view &s)
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{
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unsigned long i;
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<double>(const string_view &s)
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{
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double i;
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<long double>(const string_view &s)
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{
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long double i;
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<ircd::nanoseconds>(const string_view &s)
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{
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time_t i; //TODO: XXX
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<ircd::microseconds>(const string_view &s)
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{
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time_t i; //TODO: XXX
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<ircd::milliseconds>(const string_view &s)
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{
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time_t i; //TODO: XXX
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return boost::conversion::try_lexical_convert(s, i);
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}
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template<> bool
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ircd::try_lex_cast<ircd::seconds>(const string_view &s)
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{
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time_t i; //TODO: XXX
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return boost::conversion::try_lexical_convert(s, i);
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// ircd/stringops.h
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//
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std::string
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ircd::replace(const string_view &s,
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const char &before,
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const string_view &after)
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{
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const uint32_t occurs
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(
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std::count(begin(s), end(s), before)
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);
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const size_t size
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{
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occurs? s.size() + (occurs * after.size()):
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s.size() - occurs
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};
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return string(size, [&s, &before, &after]
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(const mutable_buffer &buf)
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{
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char *p{begin(buf)};
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std::for_each(begin(s), end(s), [&before, &after, &p]
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(const char &c)
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{
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if(c == before)
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{
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memcpy(p, after.data(), after.size());
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p += after.size();
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}
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else *p++ = c;
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});
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return std::distance(begin(buf), p);
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});
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}
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