123 lines
3.2 KiB
C++
123 lines
3.2 KiB
C++
/**
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This file is a part of rexy's general purpose library
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Copyright (C) 2022 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_DETAIL_FORMAT_OUTPUT_BUFFER_HPP
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#define REXY_DETAIL_FORMAT_OUTPUT_BUFFER_HPP
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#include <cstddef> //size_t
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#include <cstdio> //fputc, FILE
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#include <cwchar> //fputwc
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#include "format_error.hpp"
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namespace rexy::fmt::detail{
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//polymorphic buffer of which a reference can be passed around to prevent
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//passing around multiple output iterator types
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template<class Char>
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class format_output_buffer_base
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{
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public:
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using value_type = Char;
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protected:
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static constexpr std::size_t s_bufsize = 256;
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protected:
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Char m_data[s_bufsize];
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std::size_t m_size = 0;
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std::size_t m_written_count = 0;
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public:
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format_output_buffer_base(void) = default;
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virtual ~format_output_buffer_base(void) = default;
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virtual std::size_t write_out(void) = 0;
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void clear(void);
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void push_back(Char c);
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constexpr std::size_t count(void)const;
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};
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//Used with the 'formatter' to output a type
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//OutIt is an iterator where the output is written at the end.
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template<class Char, class OutIt>
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class basic_format_output_buffer : public format_output_buffer_base<Char>
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{
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private:
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using base = format_output_buffer_base<Char>;
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private:
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OutIt m_out;
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public:
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basic_format_output_buffer(OutIt out);
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~basic_format_output_buffer(void)override;
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std::size_t write_out(void)override;
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constexpr OutIt out(void);
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private:
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std::size_t write_out_simple(void);
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};
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template<class Char, class OutIt>
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class basic_format_output_n_buffer : public format_output_buffer_base<Char>
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{
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private:
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using base = format_output_buffer_base<Char>;
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private:
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OutIt m_out;
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std::size_t m_max_write = 0;
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public:
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basic_format_output_n_buffer(OutIt out, std::size_t max);
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~basic_format_output_n_buffer(void)override;
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std::size_t write_out(void)override;
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constexpr OutIt out(void);
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};
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template<class Char>
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class basic_format_size_buffer : public format_output_buffer_base<Char>
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{
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public:
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constexpr basic_format_size_buffer(void) = default;
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constexpr ~basic_format_size_buffer(void)override;
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std::size_t write_out(void)override;
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};
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template<class Char>
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struct print_format_buffer : public format_output_buffer_base<Char>
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{
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private:
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FILE* m_stream;
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public:
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constexpr print_format_buffer(FILE* stream):
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m_stream(stream){}
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constexpr ~print_format_buffer(void){
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write_out();
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}
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std::size_t write_out(void)override{
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const auto written = fwrite(this->m_data, sizeof(this->m_data[0]), this->m_size, m_stream);
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if(written != this->m_size){
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REXY_THROW_FORMAT_ERROR("Failed to print data");
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}
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}
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};
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}
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#endif
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