481 lines
19 KiB
C++
481 lines
19 KiB
C++
/**
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This file is a part of rexy's general purpose library
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Copyright (C) 2020 rexy712
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef REXY_STRING_BASE_HPP
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#define REXY_STRING_BASE_HPP
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#include <type_traits> //is_same, integral_contant, enable_if, etc
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#include <utility> //forward
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#include <cstddef> //size_t,ptrdiff
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#include <cstring> //strlen
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#include <climits> //CHAR_BIT
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#include <iterator> //reverse_iterator
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#include "steal.hpp"
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#include "utility.hpp"
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#include "traits.hpp"
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#include "expression.hpp"
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#include "detail/string_appender.hpp"
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#include "detail/hasallocator.hpp"
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#include "rexy.hpp"
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namespace rexy{
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//Base of all RAII strings. Its use is allowing passing of rexy strings to functions without knowing the exact type
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template<class Char>
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class string_base
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{
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public:
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using value_type = Char;
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using size_type = size_t;
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using difference_type = ptrdiff_t;
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using pointer = value_type*;
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using const_pointer = const value_type*;
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using reference = value_type&;
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using const_reference = const value_type&;
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using iterator = pointer;
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using const_iterator = const_pointer;
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using reverse_iterator = std::reverse_iterator<iterator>;
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using const_reverse_iterator = std::reverse_iterator<const_iterator>;
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private:
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static constexpr size_type EXTRA_SDATA_LEN = 0;
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//represent long string
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struct ldata{
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unsigned char islong:1; //common subsequence with short string
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size_type capacity:(CHAR_BIT*sizeof(size_type)-1); //take away last bit from capacity for islong
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size_type length; //length of string excluding null terminator
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constexpr ldata(void)noexcept:
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islong(0),
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capacity(0),
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length(0){}
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};
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static constexpr size_type MAX_SHORT_LEN = EXTRA_SDATA_LEN+sizeof(ldata)-2;
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//represent short string
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struct sdata{
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unsigned char islong:1; //common subsequence with long string
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unsigned char length:(CHAR_BIT-1); //take away last bit from length for islong, excludes null terminator
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value_type data[MAX_SHORT_LEN+1]; //char array for string storage
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constexpr sdata(void)noexcept:
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islong(0),
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length(0),
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data{}{}
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};
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//union of short and long string representations. Default to long representation for static_string's use case.
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union combine_data{
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ldata l;
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sdata s;
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constexpr combine_data(void)noexcept:
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l(){}
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}m_data;
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//direct access to current string data regardless of representation. Increases access speed.
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pointer m_raw = m_data.s.data;
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protected:
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//Functions for handling long vs short string manipulation. Use this instead of directly modifying m_data.
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constexpr void set_islong_flag(bool b){
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//although well defined to set either one at any time, constexpr functions cannot change active union member.
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if(b)
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m_data.l.islong = b;
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else
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m_data.s.islong = b;
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}
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constexpr bool islong(void)const{
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//common standard layout union member subsequence, never undefined behavior
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return m_data.l.islong;
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}
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constexpr pointer set_short_ptr(void){
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set_islong_flag(false);
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return m_raw = m_data.s.data;
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}
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constexpr pointer set_long_ptr(pointer ptr){
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set_islong_flag(true);
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return m_raw = ptr;
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}
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constexpr pointer get_long_ptr(void){return m_raw;}
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constexpr pointer get_short_ptr(void){return m_raw;}
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constexpr const_pointer get_long_ptr(void)const{return m_raw;}
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constexpr const_pointer get_short_ptr(void)const{return m_raw;}
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constexpr pointer get_pointer(void){return m_raw;}
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constexpr const_pointer get_pointer(void)const{return m_raw;}
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constexpr void set_long_length(size_type len){m_data.l.length = len;}
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constexpr size_type get_long_length(void)const{return m_data.l.length;}
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constexpr void set_short_length(size_type len){m_data.s.length = static_cast<unsigned char>(len);}
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constexpr size_type get_short_length(void)const{return m_data.s.length;}
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constexpr void set_long_capacity(size_type cap){m_data.l.capacity = cap;}
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constexpr void set_short_capacity(size_type){}
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constexpr size_type get_long_capacity(void)const{return m_data.l.capacity;}
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constexpr size_type get_short_capacity(void)const{return MAX_SHORT_LEN;}
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constexpr void set_length(size_type s){
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if(islong())
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set_long_length(s);
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else
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set_short_length(s);
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}
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protected:
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constexpr string_base(void)noexcept = default;
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//Initialize without copying
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constexpr string_base(pointer data, size_type len, size_type cap)noexcept{
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if(cap > MAX_SHORT_LEN){
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set_islong_flag(true);
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set_long_ptr(data);
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set_long_length(len);
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set_long_capacity(cap);
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}else if(len){
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set_islong_flag(false);
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pointer raw = set_short_ptr();
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if(len)
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memcpy(raw, data, sizeof(value_type)*len);
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raw[len] = 0;
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set_short_length(len);
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set_short_capacity(cap);
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}
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}
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constexpr string_base(pointer data, size_type len)noexcept:
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string_base(data, len, len){}
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//Copy ctor, copy length+capacity+short string, not long string value
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constexpr string_base(const string_base& s)noexcept:
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m_data(s.m_data){}
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constexpr string_base(string_base&& s)noexcept:
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m_data(std::move(s.m_data)),
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m_raw(s.islong() ? s.m_raw : m_data.s.data)
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{
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s.set_islong_flag(false);
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}
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~string_base(void)noexcept = default;
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constexpr string_base& operator=(string_base&& s)noexcept{
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std::swap(m_data, s.m_data);
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if(this->islong())
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std::swap(m_raw, s.m_raw);
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else{
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s.m_raw = m_raw;
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m_raw = m_data.s.data;
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}
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return *this;
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}
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public:
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//Length of string not including null terminator
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constexpr size_type length(void)const noexcept{
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if(islong())
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return get_long_length();
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else
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return get_short_length();
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}
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constexpr size_type capacity(void)const noexcept{
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if(islong())
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return get_long_capacity();
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else
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return get_short_capacity();
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}
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//direct access to managed pointer
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constexpr pointer c_str(void)noexcept{return get_pointer();}
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constexpr const_pointer c_str(void)const noexcept{return get_pointer();}
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constexpr pointer get(void)noexcept{return get_pointer();}
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constexpr const_pointer get(void)const noexcept{return get_pointer();}
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constexpr operator pointer(void)noexcept{return get_pointer();}
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constexpr operator const_pointer(void)const noexcept{return get_pointer();}
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//true if m_data is not empty
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constexpr bool valid(void)const noexcept{return length() > 0;}
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constexpr reference operator[](size_type i)noexcept{return get_pointer()[i];}
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constexpr const_reference operator[](size_type i)const noexcept{return get_pointer()[i];}
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constexpr const_iterator search(const string_base& s)const;
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constexpr const_iterator search(const_pointer c)const;
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constexpr iterator search(const string_base& s);
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constexpr iterator search(const_pointer c);
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template<class Searcher>
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constexpr const_iterator search(const string_base& s, const Searcher& searcher)const;
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template<class Searcher>
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constexpr const_iterator search(const_pointer c, const Searcher& searcher)const;
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template<class Searcher>
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constexpr iterator search(const string_base& s, const Searcher& searcher);
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template<class Searcher>
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constexpr iterator search(const_pointer c, const Searcher& searcher);
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constexpr bool compare(const string_base& s)const{return *this == s;}
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constexpr bool compare(const_pointer c)const{return *this == c;}
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constexpr iterator begin(void){return get_pointer();}
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constexpr const_iterator begin(void)const{return get_pointer();}
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constexpr iterator end(void){return get_pointer()+length();}
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constexpr const_iterator end(void)const{return get_pointer()+length();}
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constexpr const_iterator cbegin(void)const{return begin();}
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constexpr const_iterator cend(void)const{return end();}
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constexpr reverse_iterator rbegin(void){return reverse_iterator(get_pointer()+length());}
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constexpr const_reverse_iterator rbegin(void)const{return const_reverse_iterator(get_pointer()+length());}
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constexpr reverse_iterator rend(void){return reverse_iterator(get_pointer()-1);}
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constexpr const_reverse_iterator rend(void)const{return const_reverse_iterator(get_pointer()-1);}
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constexpr const_reverse_iterator crbegin(void)const{return rbegin();}
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constexpr const_reverse_iterator crend(void)const{return rend();}
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static constexpr bool uses_sso(void){return true;}
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static constexpr size_type short_string_size(void){return MAX_SHORT_LEN;}
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};
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//Supplies all functions that string_base can't implement
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template<class Char, class Allocator>
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class basic_string : protected detail::hasallocator<Allocator>, public string_base<Char>
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{
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public:
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using value_type = typename string_base<Char>::value_type;
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using size_type = typename string_base<Char>::size_type;
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using difference_type = typename string_base<Char>::difference_type;
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using pointer = typename string_base<Char>::pointer;
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using const_pointer = typename string_base<Char>::const_pointer;
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using reference = typename string_base<Char>::reference;
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using const_reference = typename string_base<Char>::const_reference;
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using iterator = typename string_base<Char>::iterator;
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using const_iterator = typename string_base<Char>::const_iterator;
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using reverse_iterator = typename string_base<Char>::reverse_iterator;
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using const_reverse_iterator = typename string_base<Char>::const_reverse_iterator;
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using allocator_type = Allocator;
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private:
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void _copy_construct_string(const_pointer data, size_type len, size_type cap)
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noexcept(noexcept(this->allocate(0)));
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basic_string& _copy_string(const_pointer s, size_type len)
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noexcept(noexcept(this->allocate(0)) &&
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noexcept(this->deallocate(nullptr,0)));
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public:
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constexpr basic_string(void)noexcept;
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constexpr basic_string(rexy::steal<pointer> data, size_type len)noexcept;
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constexpr basic_string(rexy::steal<pointer> data, size_type len, size_type cap)noexcept;
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constexpr basic_string(rexy::steal<pointer> data)noexcept;
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basic_string(const_pointer data, size_type len)noexcept(noexcept(this->allocate(0)));
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basic_string(const_pointer data, size_type len, size_type cap)noexcept(noexcept(this->allocate(0)));
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basic_string(const_pointer data)noexcept(noexcept(this->allocate(0)));
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explicit basic_string(size_type len)noexcept(noexcept(this->allocate(0)));
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basic_string(size_type len, size_type cap)noexcept(noexcept(this->allocate(0)));
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//normal copy and move ctors
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basic_string(const basic_string& b)noexcept(noexcept(this->allocate(0)));
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constexpr basic_string(basic_string&& s)noexcept;
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basic_string(const string_base<Char>&)noexcept(noexcept(this->allocate(0)));
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//dtor
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~basic_string(void)noexcept(noexcept(this->deallocate(nullptr, 0)));
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basic_string& operator=(const basic_string& s)
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noexcept(noexcept(this->allocate(0)) &&
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noexcept(this->deallocate(nullptr,0)));
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constexpr basic_string& operator=(basic_string&& s)noexcept;
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basic_string& operator=(const string_base<Char>& s)
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noexcept(noexcept(this->allocate(0)) &&
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noexcept(this->deallocate(nullptr,0)));
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//Copy from c string
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basic_string& operator=(const_pointer c)
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noexcept(noexcept(this->allocate(0)) &&
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noexcept(this->deallocate(nullptr,0)));
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//Replace managed pointer. Frees existing value
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void reset(pointer val = nullptr)noexcept(noexcept(this->deallocate(nullptr,0)));
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void reset(pointer val, size_type len)noexcept(noexcept(this->deallocate(nullptr,0)));
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bool resize(size_type newsize)
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noexcept(noexcept(this->allocate(0)) &&
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noexcept(this->deallocate(nullptr,0)));
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void append(const_pointer data, size_type len)
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noexcept(noexcept(this->allocate(0)) &&
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noexcept(this->deallocate(nullptr,0)));
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void append(const_pointer data)
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noexcept(noexcept(this->allocate(0)) &&
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noexcept(this->deallocate(nullptr,0)));
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template<class Alloc = allocator_type>
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basic_string<value_type,Alloc> substring(size_type start, size_type end)const;
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pointer release(void)noexcept(noexcept(this->allocate(0)));
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using detail::hasallocator<Allocator>::allocator;
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};
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//Like an expression template but not really
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template<class Left, class Right>
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class string_cat_expr : public rexy::binary_expression<Left,Right>
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{
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static_assert(std::is_same<typename std::decay_t<Left>::value_type,typename std::decay_t<Right>::value_type>::value);
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private:
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using left_t = std::decay_t<Left>;
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using right_t = std::decay_t<Right>;
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public:
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using value_type = typename left_t::value_type;
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using size_type = decltype(typename left_t::size_type{0} + typename right_t::size_type{0});
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using difference_type = decltype(typename left_t::difference_type{0} - typename right_t::difference_type{0});
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using pointer = value_type*;
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using const_pointer = const value_type*;
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using reference = value_type&;
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using const_reference = const value_type&;
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using iterator = value_type*;
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using const_iterator = const value_type*;
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public:
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using binary_expression<Left,Right>::binary_expression;
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constexpr string_cat_expr(const string_cat_expr&) = default;
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constexpr string_cat_expr(string_cat_expr&&) = default;
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constexpr size_type length(void)const noexcept;
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template<class Alloc>
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operator basic_string<value_type,Alloc>(void)
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noexcept(std::is_nothrow_constructible<basic_string<value_type,Alloc>, typename basic_string<value_type,Alloc>::size_type>::value &&
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std::is_nothrow_invocable<detail::string_appender<basic_string<value_type,Alloc>>,decltype(*this)>::value);
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};
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template<class Left, class Right>
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string_cat_expr(Left&&,Right&&) -> string_cat_expr<Left&&,Right&&>;
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template<class Char>
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class static_string : public string_base<Char>
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{
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public:
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using value_type = typename string_base<Char>::value_type;
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using size_type = typename string_base<Char>::size_type;
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using difference_type = typename string_base<Char>::difference_type;
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using pointer = typename string_base<Char>::pointer;
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using const_pointer = typename string_base<Char>::const_pointer;
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using reference = typename string_base<Char>::reference;
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using const_reference = typename string_base<Char>::const_reference;
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using iterator = typename string_base<Char>::iterator;
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using const_iterator = typename string_base<Char>::const_iterator;
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public:
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constexpr static_string(void)noexcept;
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constexpr static_string(const_pointer str, size_type len)noexcept;
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constexpr static_string(const_pointer c)noexcept;
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constexpr static_string(const static_string& s)noexcept;
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constexpr static_string(static_string&& s)noexcept;
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~static_string(void)noexcept = default;
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constexpr static_string& operator=(const_pointer c)noexcept;
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constexpr static_string& operator=(const static_string& s)noexcept;
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constexpr static_string& operator=(static_string&&)noexcept;
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};
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template<class T>
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static_string(const T*) -> static_string<T>;
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template<class T>
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static_string(const T*, size_t) -> static_string<T>;
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template<class T>
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struct is_string{
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static constexpr bool value = rexy::is_template_derived_type<T,string_base>::value || rexy::is_template_type<T,string_cat_expr>::value;
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};
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template<class T>
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struct is_concrete_string{
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static constexpr bool value = rexy::is_template_derived_type<T,string_base>::value;
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};
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namespace detail{
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template<class... Ts>
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using enable_if_string = std::enable_if_t<(is_string<Ts>::value && ...),int>;
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template<class... Ts>
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using enable_if_concrete_string = std::enable_if_t<(is_concrete_string<Ts>::value && ...),int>;
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template<class... Ts>
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using enable_if_expr_string = std::enable_if_t<(rexy::is_template_type<Ts,string_cat_expr>::value && ...),int>;
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} //namespace detail
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template<class Str1, class Str2, detail::enable_if_concrete_string<Str1,Str2> = 0>
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constexpr bool operator==(Str1&& left, Str2&& right)noexcept{
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return left.valid() && right.valid() && left.length() == right.length() && !strcmp(left.get(), right.get());
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}
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template<class Str, detail::enable_if_concrete_string<Str> = 0>
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constexpr bool operator==(Str&& left, typename std::decay_t<Str>::const_pointer right)noexcept{
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return left.valid() && right && !strcmp(left.get(), right);
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}
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template<class Str1, class Str2, detail::enable_if_concrete_string<Str1,Str2> = 0>
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constexpr bool operator!=(Str1&& left, Str2&& right)noexcept{
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return !(left == right);
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}
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template<class Str, detail::enable_if_concrete_string<Str> = 0>
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constexpr bool operator!=(Str&& left, typename std::decay_t<Str>::const_pointer right)noexcept{
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return !(left == right);
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}
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template<class Left, class Right, detail::enable_if_string<Left,Right> = 0>
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constexpr auto operator+(Left&& l, Right&& r)
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//uses deduction guide whereas std::is_nothrow_constructible couldn't
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noexcept(noexcept(::new (nullptr) string_cat_expr(std::forward<Left>(l), std::forward<Right>(r))))
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{
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return string_cat_expr(std::forward<Left>(l), std::forward<Right>(r));
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}
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template<class Right, detail::enable_if_string<Right> = 0>
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constexpr auto operator+(typename std::decay_t<Right>::const_pointer left, Right&& right)
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noexcept(noexcept(::new (nullptr) string_cat_expr(rexy::static_string(left), std::forward<Right>(right))))
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{
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return string_cat_expr(rexy::static_string(left), std::forward<Right>(right));
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}
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template<class Left, detail::enable_if_string<Left> = 0>
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constexpr auto operator+(Left&& left, typename std::decay_t<Left>::const_pointer right)
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noexcept(noexcept(::new (nullptr) string_cat_expr(std::forward<Left>(left), rexy::static_string(right))))
|
|
{
|
|
return rexy::string_cat_expr(std::forward<Left>(left), rexy::static_string(right));
|
|
}
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|
|
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template<class Left, class Right, detail::enable_if_concrete_string<Left> = 0, detail::enable_if_string<Right> = 0>
|
|
decltype(auto) operator+=(Left& l, Right&& r)
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|
noexcept(noexcept(l + std::forward<Right>(r)) && std::is_nothrow_assignable<Left, decltype(l + std::forward<Right>(r))>::value)
|
|
{
|
|
return l = (l + std::forward<Right>(r));
|
|
}
|
|
template<class Left, detail::enable_if_concrete_string<Left> = 0>
|
|
decltype(auto) operator+=(Left& l, typename std::decay_t<Left>::const_pointer r)
|
|
noexcept(noexcept(l + r) && std::is_nothrow_assignable<Left, decltype(l + r)>::value)
|
|
{
|
|
return l = (l + r);
|
|
}
|
|
}
|
|
|
|
#include "string_base.tpp"
|
|
|
|
namespace{
|
|
constexpr inline rexy::static_string<char> operator"" _ss(const char* str, size_t len)noexcept{
|
|
return rexy::static_string(str, len);
|
|
}
|
|
constexpr inline rexy::static_string<wchar_t> operator"" _ss(const wchar_t* str, size_t len)noexcept{
|
|
return rexy::static_string(str, len);
|
|
}
|
|
constexpr inline rexy::static_string<char16_t> operator"" _ss(const char16_t* str, size_t len)noexcept{
|
|
return rexy::static_string(str, len);
|
|
}
|
|
constexpr inline rexy::static_string<char32_t> operator"" _ss(const char32_t* str, size_t len)noexcept{
|
|
return rexy::static_string(str, len);
|
|
}
|
|
|
|
}
|
|
|
|
#ifdef REXY_BINARY_BASE_HPP
|
|
#include "detail/binary_string_conv.hpp"
|
|
#endif
|
|
#ifdef REXY_HASH_HPP
|
|
#include "static_string_hash.hpp"
|
|
#endif
|
|
|
|
#endif
|