mirror of
https://github.com/matrix-construct/construct
synced 2024-11-04 21:08:57 +01:00
266 lines
9.1 KiB
C++
266 lines
9.1 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_LEX_CAST_H
|
|
|
|
//
|
|
// Lexical conversions
|
|
//
|
|
namespace ircd
|
|
{
|
|
IRCD_EXCEPTION_HIDENAME(ircd::error, bad_lex_cast)
|
|
|
|
template<class T> bool lex_castable(const string_view &);
|
|
|
|
template<class T> T lex_cast(std::string &);
|
|
template<class T> T lex_cast(const std::string &);
|
|
template<class T> T lex_cast(const std::string_view &);
|
|
template<class T> T lex_cast(const string_view &);
|
|
|
|
// User supplied destination buffer
|
|
template<class T> string_view lex_cast(T, const mutable_buffer &buf);
|
|
|
|
// Circular static thread_local buffer
|
|
extern const size_t LEX_CAST_BUFS;
|
|
extern const size_t LEX_CAST_BUFSIZE;
|
|
template<class T> string_view lex_cast(const T &t);
|
|
}
|
|
|
|
namespace ircd
|
|
{
|
|
template<> bool lex_castable<std::string>(const string_view &); // stub always true
|
|
template<> bool lex_castable<std::string_view>(const string_view &); // stub always true
|
|
template<> bool lex_castable<string_view>(const string_view &); // stub always true
|
|
template<> bool lex_castable<long double>(const string_view &);
|
|
template<> bool lex_castable<double>(const string_view &);
|
|
template<> bool lex_castable<float>(const string_view &);
|
|
template<> bool lex_castable<ulong>(const string_view &);
|
|
template<> bool lex_castable<long>(const string_view &);
|
|
template<> bool lex_castable<uint>(const string_view &);
|
|
template<> bool lex_castable<int>(const string_view &);
|
|
template<> bool lex_castable<ushort>(const string_view &);
|
|
template<> bool lex_castable<short>(const string_view &);
|
|
template<> bool lex_castable<uint8_t>(const string_view &);
|
|
template<> bool lex_castable<int8_t>(const string_view &);
|
|
template<> bool lex_castable<bool>(const string_view &);
|
|
template<> bool lex_castable<seconds>(const string_view &);
|
|
template<> bool lex_castable<milliseconds>(const string_view &);
|
|
template<> bool lex_castable<microseconds>(const string_view &);
|
|
template<> bool lex_castable<nanoseconds>(const string_view &);
|
|
|
|
template<> std::string &lex_cast(std::string &); // trivial
|
|
template<> std::string lex_cast(const std::string &); // trivial
|
|
template<> std::string_view lex_cast(const std::string_view &); // trivial
|
|
template<> std::string lex_cast(const string_view &); // trivial
|
|
template<> long double lex_cast(const string_view &);
|
|
template<> double lex_cast(const string_view &);
|
|
template<> float lex_cast(const string_view &);
|
|
template<> ulong lex_cast(const string_view &);
|
|
template<> long lex_cast(const string_view &);
|
|
template<> uint lex_cast(const string_view &);
|
|
template<> int lex_cast(const string_view &);
|
|
template<> ushort lex_cast(const string_view &);
|
|
template<> short lex_cast(const string_view &);
|
|
template<> uint8_t lex_cast(const string_view &);
|
|
template<> int8_t lex_cast(const string_view &);
|
|
template<> bool lex_cast(const string_view &);
|
|
template<> seconds lex_cast(const string_view &);
|
|
template<> milliseconds lex_cast(const string_view &);
|
|
template<> microseconds lex_cast(const string_view &);
|
|
template<> nanoseconds lex_cast(const string_view &);
|
|
|
|
template<> string_view lex_cast(const std::string &, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(const std::string_view &, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(const string_view &, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(seconds, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(milliseconds, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(microseconds, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(nanoseconds, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(long double, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(double, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(float, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(ulong, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(long, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(uint, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(int, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(ushort, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(short, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(uint8_t, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(int8_t, const mutable_buffer &buf);
|
|
template<> string_view lex_cast(bool, const mutable_buffer &buf);
|
|
}
|
|
|
|
#ifdef __clang__
|
|
#define IRCD_LEX_CAST_UNNECESSARY \
|
|
__attribute__((deprecated("unnecessary lexical cast")))
|
|
#else
|
|
#define IRCD_LEX_CAST_UNNECESSARY \
|
|
__attribute__((warning("unnecessary lexical cast")))
|
|
#endif
|
|
|
|
/// Convert a native number to a string. The returned value is a view of the
|
|
/// string in a static ring buffer. There are LEX_CAST_BUFS number of buffers
|
|
/// so you should not hold on to the returned view for very long.
|
|
template<class T>
|
|
ircd::string_view
|
|
ircd::lex_cast(const T &t)
|
|
{
|
|
return lex_cast<T>(t, null_buffer);
|
|
}
|
|
|
|
/// Conversion to an std::string creates a copy when the input is a
|
|
/// string_view. Note this is not considered an "unnecessary lexical cast"
|
|
/// even though nothing is being converted, so there will be no warning.
|
|
template<>
|
|
inline std::string
|
|
ircd::lex_cast<std::string>(const string_view &s)
|
|
{
|
|
return std::string{s};
|
|
}
|
|
|
|
/// Template basis for a string_view input
|
|
template<class T>
|
|
T
|
|
ircd::lex_cast(const string_view &s)
|
|
{
|
|
return s;
|
|
}
|
|
|
|
/// Specialization of a string_view to string_view conversion which is just
|
|
/// a trivial copy of the view.
|
|
template<>
|
|
inline std::string_view
|
|
ircd::lex_cast<std::string_view>(const std::string_view &s)
|
|
{
|
|
return s;
|
|
}
|
|
|
|
/// Specialization of a string to string conversion which generates a warning
|
|
/// because the conversion has to copy the string while no numerical conversion
|
|
/// has taken place. The developer should remove the offending lex_cast.
|
|
template<>
|
|
IRCD_LEX_CAST_UNNECESSARY
|
|
inline std::string
|
|
ircd::lex_cast<std::string>(const std::string &s)
|
|
{
|
|
return s;
|
|
}
|
|
|
|
/// Template basis for a const std::string input
|
|
template<class T>
|
|
T
|
|
ircd::lex_cast(const std::string &s)
|
|
{
|
|
return lex_cast<T>(string_view{s});
|
|
}
|
|
|
|
/// Template basis for an lvalue string. If we can get this binding rather
|
|
/// than the const std::string alternative some trivial conversions are
|
|
/// easier to make in the specializations.
|
|
template<class T>
|
|
T
|
|
ircd::lex_cast(std::string &s)
|
|
{
|
|
return lex_cast<T>(string_view{s});
|
|
}
|
|
|
|
/// Specialization of a string to string conversion without a warning because
|
|
/// we can trivially pass through a reference from input to output.
|
|
template<>
|
|
inline std::string &
|
|
ircd::lex_cast(std::string &s)
|
|
{
|
|
return s;
|
|
}
|
|
|
|
/// Specialization of a string to string conversion to user's buffer;
|
|
/// marked as unnecessary because no numerical conversion takes place yet
|
|
/// data is still copied. (note: warning may be removed; may be intentional)
|
|
template<>
|
|
IRCD_LEX_CAST_UNNECESSARY
|
|
inline ircd::string_view
|
|
ircd::lex_cast(const string_view &s,
|
|
const mutable_buffer &buf)
|
|
{
|
|
s.copy(data(buf), size(buf));
|
|
return { data(buf), s.size() };
|
|
}
|
|
|
|
/// Specialization of a string to string conversion to user's buffer;
|
|
/// marked as unnecessary because no numerical conversion takes place yet
|
|
/// data is still copied. (note: warning may be removed; may be intentional)
|
|
template<>
|
|
IRCD_LEX_CAST_UNNECESSARY
|
|
inline ircd::string_view
|
|
ircd::lex_cast(const std::string_view &s,
|
|
const mutable_buffer &buf)
|
|
{
|
|
s.copy(data(buf), size(buf));
|
|
return { data(buf), s.size() };
|
|
}
|
|
|
|
/// Specialization of a string to string conversion to user's buffer;
|
|
/// marked as unnecessary because no numerical conversion takes place yet
|
|
/// data is still copied. (note: warning may be removed; may be intentional)
|
|
template<>
|
|
IRCD_LEX_CAST_UNNECESSARY
|
|
inline ircd::string_view
|
|
ircd::lex_cast(const std::string &s,
|
|
const mutable_buffer &buf)
|
|
{
|
|
s.copy(data(buf), size(buf));
|
|
return { data(buf), s.size() };
|
|
}
|
|
|
|
/// Template basis; if no specialization is matched there is no fallback here
|
|
template<class T>
|
|
IRCD_LEX_CAST_UNNECESSARY
|
|
ircd::string_view
|
|
ircd::lex_cast(T t,
|
|
const mutable_buffer &buf)
|
|
{
|
|
assert(0);
|
|
return {};
|
|
}
|
|
|
|
/// Template basis; if no specialization is matched there is no fallback here
|
|
template<class T>
|
|
IRCD_LEX_CAST_UNNECESSARY
|
|
bool
|
|
ircd::lex_castable(const string_view &s)
|
|
{
|
|
assert(0);
|
|
return false;
|
|
}
|
|
|
|
/// Trivial conversion; always returns true
|
|
template<>
|
|
inline bool
|
|
ircd::lex_castable<ircd::string_view>(const string_view &)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/// Trivial conversion; always returns true
|
|
template<>
|
|
inline bool
|
|
ircd::lex_castable<std::string_view>(const string_view &)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/// Trivial conversion; always returns true
|
|
template<>
|
|
inline bool
|
|
ircd::lex_castable<std::string>(const string_view &s)
|
|
{
|
|
return true;
|
|
}
|