mirror of
https://github.com/matrix-construct/construct
synced 2024-12-27 07:54:05 +01:00
ircd: Split string_view out of util::.
This commit is contained in:
Jason Volk
parent
6cd58b0d6a
commit
c3a88edeee
3 changed files with 245 additions and 208 deletions
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@ -193,6 +193,7 @@ namespace ircd
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}
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#include "util.h"
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#include "string_view.h"
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#include "date.h"
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#include "rand.h"
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#include "timer.h"
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244
include/ircd/string_view.h
Normal file
244
include/ircd/string_view.h
Normal file
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@ -0,0 +1,244 @@
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/*
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* charybdis: 21st Century IRC++d
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* util.h: Miscellaneous utilities
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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_STRING_VIEW_H
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namespace ircd
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{
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struct string_view;
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template<class T> struct vector_view;
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template<class T = string_view> struct byte_view;
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template<> struct byte_view<string_view>;
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bool operator!(const string_view &);
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}
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//
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// Customized std::string_view (experimental TS / C++17)
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//
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// This class adds iterator-based (char*, char*) construction to std::string_view which otherwise
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// takes traditional (char*, size_t) arguments. This allows boost::spirit grammars to create
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// string_view's using the raw[] directive achieving zero-copy/zero-allocation parsing.
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//
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struct ircd::string_view
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:std::string_view
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{
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// (non-standard) our faux insert stub
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// Tricks boost::spirit into thinking this is mutable string (hint: it's not).
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// Instead, the raw[] directive in Qi grammar will use the iterator constructor only.
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// __attribute__((error("string_view is not insertable (hint: use raw[] directive)")))
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void insert(const iterator &, const char &)
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{
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assert(0);
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}
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// (non-standard) our iterator-based assign
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string_view &assign(const char *const &begin, const char *const &end)
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{
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*this = std::string_view{begin, size_t(std::distance(begin, end))};
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return *this;
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}
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// (non-standard) intuitive wrapper for remove_suffix.
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// Unlike std::string, we can cheaply involve a reference to the removed character
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// which still exists.
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const char &pop_back()
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{
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const char &ret(back());
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remove_suffix(1);
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return ret;
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}
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// (non-standard) intuitive wrapper for remove_prefix.
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// Unlike std::string, we can cheaply involve a reference to the removed character
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// which still exists.
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const char &pop_front()
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{
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const char &ret(front());
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remove_prefix(1);
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return ret;
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}
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// (non-standard) our iterator-based constructor
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string_view(const char *const &begin, const char *const &end)
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:std::string_view{begin, size_t(std::distance(begin, end))}
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{}
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// (non-standard) our array based constructor
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template<size_t SIZE>
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string_view(const std::array<char, SIZE> &array)
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:string_view
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{
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array.data(), std::find(array.begin(), array.end(), '\0')
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}{}
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// (non-standard) our buffer based constructor
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template<size_t SIZE>
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string_view(const char (&buf)[SIZE])
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:string_view
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{
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buf, std::find(buf, buf + SIZE, '\0')
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}{}
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// Required due to current instability in stdlib
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//string_view(const std::experimental::string_view &esv)
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//:std::string_view{esv}
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//{}
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// Required due to current instability in stdlib
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string_view(const std::experimental::fundamentals_v1::basic_string_view<char> &bsv)
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:std::string_view{bsv}
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{}
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string_view()
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:std::string_view{}
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{}
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using std::string_view::string_view;
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};
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template<class T>
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struct ircd::vector_view
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{
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T *_data { nullptr };
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T *_stop { nullptr };
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public:
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T *data() const { return _data; }
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size_t size() const { return std::distance(_data, _stop); }
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bool empty() const { return !size(); }
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const T *begin() const { return data(); }
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const T *end() const { return _stop; }
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const T *cbegin() { return data(); }
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const T *cend() { return _stop; }
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T *begin() { return data(); }
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T *end() { return _stop; }
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const T &operator[](const size_t &pos) const
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{
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return *(data() + pos);
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}
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T &operator[](const size_t &pos)
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{
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return *(data() + pos);
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}
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const T &at(const size_t &pos) const
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{
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if(unlikely(pos >= size()))
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throw std::out_of_range();
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return operator[](pos);
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}
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T &at(const size_t &pos)
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{
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if(unlikely(pos >= size()))
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throw std::out_of_range();
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return operator[](pos);
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}
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vector_view(T *const &start, T *const &stop)
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:_data{start}
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,_stop{stop}
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{}
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vector_view(T *const &start, const size_t &size)
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:_data{start}
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,_stop{start + size}
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{}
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template<class U,
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class A>
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vector_view(std::vector<U, A> &v)
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:vector_view{v.data(), v.size()}
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{}
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template<size_t SIZE>
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vector_view(T (&buffer)[SIZE])
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:vector_view{std::addressof(buffer), SIZE}
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{}
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template<size_t SIZE>
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vector_view(std::array<T, SIZE> &array)
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:vector_view{array.data(), array.size()}
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{}
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vector_view() = default;
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};
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// string_view -> bytes
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template<class T>
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struct ircd::byte_view
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{
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string_view s;
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operator const T &() const
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{
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return *reinterpret_cast<const T *>(s.data());
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}
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byte_view(const string_view &s)
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:s{s}
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{
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if(unlikely(sizeof(T) != s.size()))
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throw std::bad_cast();
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}
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// bytes -> bytes (completeness)
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byte_view(const T &t)
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:s{byte_view<string_view>{t}}
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{}
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};
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// bytes -> string_view
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template<>
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struct ircd::byte_view<ircd::string_view>
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:string_view
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{
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template<class T>
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byte_view(const T &t)
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:string_view{reinterpret_cast<const char *>(&t), sizeof(T)}
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{}
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};
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// string_view -> string_view (completeness)
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namespace ircd
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{
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template<> inline
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byte_view<string_view>::byte_view(const string_view &t)
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:string_view{t}
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{}
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}
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inline bool
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ircd::operator!(const string_view &str)
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{
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return str.empty();
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}
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@ -792,209 +792,6 @@ struct values
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};
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//
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// Customized std::string_view (experimental TS / C++17)
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//
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// This class adds iterator-based (char*, char*) construction to std::string_view which otherwise
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// takes traditional (char*, size_t) arguments. This allows boost::spirit grammars to create
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// string_view's using the raw[] directive achieving zero-copy/zero-allocation parsing.
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//
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struct string_view
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:std::string_view
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{
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// (non-standard) our faux insert stub
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// Tricks boost::spirit into thinking this is mutable string (hint: it's not).
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// Instead, the raw[] directive in Qi grammar will use the iterator constructor only.
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// __attribute__((error("string_view is not insertable (hint: use raw[] directive)")))
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void insert(const iterator &, const char &)
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{
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assert(0);
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}
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// (non-standard) our iterator-based assign
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string_view &assign(const char *const &begin, const char *const &end)
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{
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*this = std::string_view{begin, size_t(std::distance(begin, end))};
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return *this;
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}
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// (non-standard) intuitive wrapper for remove_suffix.
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// Unlike std::string, we can cheaply involve a reference to the removed character
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// which still exists.
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const char &pop_back()
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{
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const char &ret(back());
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remove_suffix(1);
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return ret;
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}
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// (non-standard) intuitive wrapper for remove_prefix.
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// Unlike std::string, we can cheaply involve a reference to the removed character
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// which still exists.
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const char &pop_front()
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{
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const char &ret(front());
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remove_prefix(1);
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return ret;
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}
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// (non-standard) our iterator-based constructor
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string_view(const char *const &begin, const char *const &end)
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:std::string_view{begin, size_t(std::distance(begin, end))}
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{}
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// (non-standard) our array based constructor
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template<size_t SIZE>
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string_view(const std::array<char, SIZE> &array)
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:string_view
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{
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array.data(), std::find(array.begin(), array.end(), '\0')
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}{}
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// (non-standard) our buffer based constructor
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template<size_t SIZE>
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string_view(const char (&buf)[SIZE])
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:string_view
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{
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buf, std::find(buf, buf + SIZE, '\0')
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}{}
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// Required due to current instability in stdlib
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//string_view(const std::experimental::string_view &esv)
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//:std::string_view{esv}
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//{}
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// Required due to current instability in stdlib
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string_view(const std::experimental::fundamentals_v1::basic_string_view<char> &bsv)
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:std::string_view{bsv}
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{}
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string_view()
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:std::string_view{}
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{}
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using std::string_view::string_view;
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};
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template<class T>
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struct vector_view
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{
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T *_data { nullptr };
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T *_stop { nullptr };
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public:
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T *data() const { return _data; }
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size_t size() const { return std::distance(_data, _stop); }
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bool empty() const { return !size(); }
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const T *begin() const { return data(); }
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const T *end() const { return _stop; }
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const T *cbegin() { return data(); }
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const T *cend() { return _stop; }
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T *begin() { return data(); }
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T *end() { return _stop; }
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const T &operator[](const size_t &pos) const
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{
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return *(data() + pos);
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}
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T &operator[](const size_t &pos)
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{
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return *(data() + pos);
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}
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const T &at(const size_t &pos) const
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{
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if(unlikely(pos >= size()))
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throw std::out_of_range();
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return operator[](pos);
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}
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T &at(const size_t &pos)
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{
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if(unlikely(pos >= size()))
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throw std::out_of_range();
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return operator[](pos);
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}
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vector_view(T *const &start, T *const &stop)
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:_data{start}
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,_stop{stop}
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{}
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vector_view(T *const &start, const size_t &size)
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:_data{start}
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,_stop{start + size}
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{}
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template<class U,
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class A>
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vector_view(std::vector<U, A> &v)
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:vector_view{v.data(), v.size()}
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{}
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template<size_t SIZE>
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vector_view(T (&buffer)[SIZE])
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:vector_view{std::addressof(buffer), SIZE}
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{}
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template<size_t SIZE>
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vector_view(std::array<T, SIZE> &array)
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:vector_view{array.data(), array.size()}
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{}
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vector_view() = default;
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};
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//
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// Convenience cast a type (ex. an integer) into and out of a string_view
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//
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// string_view -> bytes
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template<class T = string_view>
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struct byte_view
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{
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string_view s;
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operator const T &() const
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{
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return *reinterpret_cast<const T *>(s.data());
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}
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byte_view(const string_view &s)
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:s{s}
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{
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if(unlikely(sizeof(T) != s.size()))
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throw std::bad_cast();
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}
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// bytes -> bytes (completeness)
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byte_view(const T &t)
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:s{byte_view<string_view>{t}}
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{}
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};
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// bytes -> string_view
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template<>
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struct byte_view<string_view>
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:string_view
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{
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template<class T>
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byte_view(const T &t)
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:string_view{reinterpret_cast<const char *>(&t), sizeof(T)}
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{}
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};
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// string_view -> string_view (completeness)
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template<> inline
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byte_view<string_view>::byte_view(const string_view &t)
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:string_view{t}
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{}
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//
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// Error-checking closure for POSIX system calls. Note the usage is
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@ -1213,11 +1010,6 @@ operator!(const std::string_view &str)
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return str.empty();
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}
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inline auto
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operator!(const string_view &str)
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{
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return str.empty();
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}
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//
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