78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
#ifndef RAII_STRING_HPP
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#define RAII_STRING_HPP
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#include "raii/string_base.hpp"
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#include <new> //operator new/delete
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#include <cstring> //memcpy
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namespace raii{
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namespace detail{
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class default_allocator
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{
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public:
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static void free(void* data){
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::operator delete(data);
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}
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static void* allocate(size_t size){
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return ::operator new(size);
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}
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static void* copy(const void* c, size_t size){
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char* tmp = reinterpret_cast<char*>(allocate(size));
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memcpy(tmp, c, size-1);
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tmp[size-1] = 0;
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return tmp;
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}
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};
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}
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//new allocated string
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struct string : public string_intermediary<detail::default_allocator>
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{
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string(const string&) = default;
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string(string&&) = default;
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string& operator=(const string&) = default;
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string& operator=(string&&) = default;
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using string_intermediary<detail::default_allocator>::string_intermediary;
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using string_intermediary<detail::default_allocator>::operator=;
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};
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namespace detail{
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size_t _calc_escaped_len(const char* str);
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char _escape_to_letter(char escape);
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size_t _sanitize_json_copy(char* dest, const char* in);
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template<class Tup, size_t I = 0>
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void _js_assign(char* dest, Tup&& t, size_t offset){
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size_t written = _sanitize_json_copy(dest+offset, std::get<I>(t));
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if constexpr(I+2 < std::tuple_size<std::remove_reference_t<Tup>>::value){
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_js_assign<Tup,I+2>(dest, std::forward<Tup>(t), offset+written);
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}
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}
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template<class T, size_t I = 0>
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size_t _calc_escaped_len_all(T&& t){
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size_t len = _calc_escaped_len(std::get<I>(t));
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if constexpr(I+2 < std::tuple_size<std::remove_reference_t<T>>::value){
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len += _calc_escaped_len_all<T,I+2>(std::forward<T>(t));
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}
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return len;
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}
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}
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template<class T, typename std::enable_if<detail::is_string<T>::value && !detail::is_concrete_string<T>::value,void>::type* = nullptr>
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string json_escape(T&& t){
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auto tup = t.get();
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size_t len = detail::_calc_escaped_len_all(tup);
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char* tmp = reinterpret_cast<char*>(string::allocator_type::allocate(len+1));
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detail::_js_assign(tmp, tup, 0);
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tmp[len] = 0;
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return string(tmp, len);
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}
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string json_escape(const string_base& str);
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}
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#endif
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