295 lines
11 KiB
C++
295 lines
11 KiB
C++
/**
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This file is a part of rexy's matrix client
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Copyright (C) 2019-2020 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 Affero 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 Affero General Public License for more details.
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You should have received a copy of the GNU Affero 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 RAII_STRING_BASE_HPP
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#define RAII_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 <cstdlib> //size_t
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namespace raii{
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class string_expr{};
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//Base of all RAII strings. Its use is allowing passing of raii strings to functions without knowing the exact type
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class string_base : public string_expr
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{
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protected:
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size_t m_length = 0;
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size_t m_cap = 0;
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char* m_data = nullptr;
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protected:
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constexpr string_base(void) = default;
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constexpr string_base(size_t len):
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m_cap(len){}
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//Initialize without copying
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constexpr string_base(char* data, size_t len):
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m_cap(len), m_data(data){}
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constexpr string_base(char* data, size_t len, size_t cap):
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m_length(len), m_cap(cap), m_data(data){}
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//Copy ctor (do nothing)
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string_base(const string_base&){}
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~string_base(void) = default;
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public:
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//Stop managing stored pointer. Does not free.
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char* release(void);
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//Length of string not including null terminator
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constexpr size_t length(void)const{return m_length;}
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constexpr size_t capacity(void)const{return m_cap;}
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//direct access to managed pointer
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constexpr char* get(void){return m_data;}
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constexpr const char* get(void)const{return m_data;}
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constexpr operator char*(void){return m_data;}
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constexpr operator const char*(void)const{return m_data;}
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//true if m_data is not null
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constexpr operator bool(void)const{return m_data;}
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char& operator[](size_t i);
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const char& operator[](size_t i)const;
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};
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//Supplies all functions that string_base can't implement
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template<class Allocator>
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class string_intermediary : public string_base
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{
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public:
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using allocator_type = Allocator;
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public:
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string_intermediary(void) = default;
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string_intermediary(char* data, size_t len);
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string_intermediary(const char* data, size_t len);
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string_intermediary(char* data, size_t len, size_t cap);
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string_intermediary(const char* data);
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string_intermediary(size_t len);
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string_intermediary(size_t len, size_t cap);
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//normal copy and move ctors
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string_intermediary(const string_intermediary& b);
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string_intermediary(string_intermediary&& s);
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string_intermediary(const string_base& b);
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//dtor
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~string_intermediary(void);
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string_intermediary& operator=(const string_intermediary& s);
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string_intermediary& operator=(string_intermediary&& s);
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//Copy from c string
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string_intermediary& operator=(const char* c);
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//Copy from other string_base
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string_intermediary& operator=(const string_base& s);
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//Replace managed pointer. Frees existing value
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void reset(char* val = nullptr);
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void reset(char* val, size_t len);
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bool resize(size_t newsize);
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void append(const char* data, size_t len);
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void append(const char* data);
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void append(const string_base& s);
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private:
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string_intermediary& _copy_string(const char* s, size_t len);
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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 string_expr
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{
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private:
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Left m_l;
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Right m_r;
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public:
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template<class T, class U>
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constexpr string_cat_expr(T&& l, U&& r);
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constexpr string_cat_expr(const string_cat_expr& s);
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constexpr string_cat_expr(string_cat_expr&& s);
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constexpr size_t length(void)const;
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template<class Alloc>
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operator string_intermediary<Alloc>(void);
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constexpr const Left& left(void)const;
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constexpr const Right& right(void)const;
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};
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class static_string : public string_base
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{
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public:
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constexpr static_string(void) = default;
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template<size_t N>
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constexpr static_string(const char(&str)[N]);
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constexpr static_string(const char* str, size_t len);
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static_string(const char* c);
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constexpr static_string(const static_string& s);
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constexpr static_string(static_string&& s);
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~static_string(void) = default;
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static_string& operator=(const char* c);
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static_string& operator=(const static_string& s);
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static_string& operator=(static_string&&) = delete;
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};
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namespace detail{
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std::true_type is_string_helper(string_expr);
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std::false_type is_string_helper(...);
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template<class T>
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struct is_string{
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static constexpr bool value = std::is_same<std::true_type,decltype(is_string_helper(std::declval<T>()))>::value;
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};
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std::true_type is_string_base(string_base*);
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std::false_type is_string_base(...);
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template<class T>
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struct is_concrete_string{
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static constexpr bool value = std::is_same<std::true_type,decltype(is_string_base(std::declval<typename std::decay<T>::type*>()))>::value;
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};
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template<class... Args>
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std::true_type is_tuple_helper(std::tuple<Args...>);
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std::false_type is_tuple_helper(...);
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template<class T>
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struct is_tuple{
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static constexpr bool value = std::is_same<std::true_type,decltype(is_tuple_helper(std::declval<T>()))>::value;
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};
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//check for member function 'length'
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template<class T>
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struct has_len{
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template<class U, class V>
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struct check;
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template<class U>
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static std::true_type test(check<U,decltype(&U::length)>*);
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template<class U>
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static std::false_type test(...);
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static constexpr bool value = std::is_same<std::true_type,decltype(test<T>(0))>::value;
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};
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template<class Targ>
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struct appender
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{
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private:
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Targ& m_targ;
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public:
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appender(Targ& t);
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template<class L, class R>
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void operator()(const string_cat_expr<L,R>& str);
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void operator()(const string_base& str);
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};
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}
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}
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#include "raii/string_base.tpp"
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namespace{
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constexpr inline raii::static_string operator"" _ss(const char* str, size_t len){
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return raii::static_string(str, len);
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}
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}
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template<class Str1, class Str2, typename std::enable_if<raii::detail::is_concrete_string<Str1>::value&&raii::detail::is_concrete_string<Str2>::value,void>::type* = nullptr>
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bool operator==(Str1&& left, Str2&& right){
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return left && right && left.length() == right.length() && !strcmp(left.get(), right.get());
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}
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template<class Str1, class Str2, typename std::enable_if<raii::detail::is_concrete_string<Str1>::value&&raii::detail::is_concrete_string<Str2>::value,void>::type* = nullptr>
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bool operator!=(Str1&& left, Str2&& right){
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return !(left == right);
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}
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template<class Right, typename std::enable_if<raii::detail::is_string<Right>::value && std::is_rvalue_reference<Right&&>::value,void>::type* = nullptr>
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constexpr auto operator+(const char* left, Right&& right){
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return raii::string_cat_expr<raii::static_string,typename std::remove_reference<Right>::type>(raii::static_string(left), std::move(right));
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}
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template<class Right, typename std::enable_if<raii::detail::is_string<Right>::value && !std::is_rvalue_reference<Right&&>::value,void>::type* = nullptr>
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constexpr auto operator+(const char* left, Right&& right){
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return raii::string_cat_expr<raii::static_string,decltype(std::forward<Right>(right))>(raii::static_string(left), std::forward<Right>(right));
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}
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template<class Left, typename std::enable_if<raii::detail::is_string<Left>::value && std::is_rvalue_reference<Left&&>::value,void>::type* = nullptr>
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constexpr auto operator+(Left&& left, const char* right){
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return raii::string_cat_expr<typename std::remove_reference<Left>::type,raii::static_string>(std::move(left), raii::static_string(right));
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}
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template<class Left, typename std::enable_if<raii::detail::is_string<Left>::value && !std::is_rvalue_reference<Left&&>::value,void>::type* = nullptr>
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constexpr auto operator+(Left&& left, const char* right){
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return raii::string_cat_expr<decltype(std::forward<Left>(left)),raii::static_string>(std::forward<Left>(left), raii::static_string(right));
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}
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template<class Left,
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class Right,
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typename std::enable_if<
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raii::detail::is_string<Left>::value &&
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raii::detail::is_string<Right>::value &&
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std::is_rvalue_reference<Left&&>::value &&
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std::is_rvalue_reference<Right&&>::value,
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void>::type* = nullptr>
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constexpr auto operator+(Left&& l, Right&& r){
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return raii::string_cat_expr<typename std::remove_reference<Left>::type,typename std::remove_reference<Right>::type>(std::move(l), std::move(r));
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}
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template<class Left,
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class Right,
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typename std::enable_if<
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raii::detail::is_string<Left>::value &&
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raii::detail::is_string<Right>::value &&
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!std::is_rvalue_reference<Left&&>::value &&
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!std::is_rvalue_reference<Right&&>::value,
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void>::type* = nullptr>
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constexpr auto operator+(Left&& l, Right&& r){
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return raii::string_cat_expr<decltype(std::forward<Left>(l)),decltype(std::forward<Right>(r))>(std::forward<Left>(l), std::forward<Right>(r));
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}
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template<class Left,
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class Right,
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typename std::enable_if<
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raii::detail::is_string<Left>::value &&
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raii::detail::is_string<Right>::value &&
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std::is_rvalue_reference<Left&&>::value &&
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!std::is_rvalue_reference<Right&&>::value,
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void>::type* = nullptr>
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constexpr auto operator+(Left&& l, Right&& r){
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return raii::string_cat_expr<typename std::remove_reference<Left>::type,decltype(std::forward<Right>(r))>(std::move(l), std::forward<Right>(r));
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}
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template<class Left,
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class Right,
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typename std::enable_if<
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raii::detail::is_string<Left>::value &&
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raii::detail::is_string<Right>::value &&
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!std::is_rvalue_reference<Left&&>::value &&
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std::is_rvalue_reference<Right&&>::value,
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void>::type* = nullptr>
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constexpr auto operator+(Left&& l, Right&& r){
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return raii::string_cat_expr<decltype(std::forward<Left>(l)),typename std::remove_reference<Right>::type>(std::forward<Left>(l), std::move(r));
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}
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template<class Left, class Right, typename std::enable_if<raii::detail::is_string<Left>::value&&raii::detail::is_string<Right>::value,void>::type* = nullptr>
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decltype(auto) operator+=(Left& l, Right&& r){
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return l = (l + std::forward<Right>(r));
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}
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template<class Left, typename std::enable_if<raii::detail::is_string<Left>::value,void>::type* = nullptr>
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decltype(auto) operator+=(Left& l, const char* r){
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return l = (l + r);
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}
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#ifdef RAII_BINARY_HPP
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#include "raii/binary_string_conv.hpp"
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#endif
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#endif
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