mirror of
https://github.com/ToruNiina/toml11.git
synced 2024-11-23 04:40:06 +00:00
387 lines
12 KiB
C++
387 lines
12 KiB
C++
#ifndef TOML11_FORMAT
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#define TOML11_FORMAT
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#include "value.hpp"
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#include <type_traits>
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#include <iostream>
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#include <sstream>
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#include <iomanip>
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#include <locale>
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namespace toml
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{
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// synopsis
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// toml::format("key", value, toml::make_inline(80))
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// toml::format("key", value, toml::forceinline)
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// std::cout << toml::make_inline(80) << value;
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// std::cout << toml::forceinline << value;
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template<typename traits = std::char_traits<toml::character>,
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typename alloc = std::allocator<toml::character>>
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std::basic_string<toml::character, traits, alloc>
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format(const value& v);
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template<typename traits = std::char_traits<toml::character>,
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typename alloc = std::allocator<toml::character>>
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std::basic_string<toml::character, traits, alloc>
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format(const value& v, std::size_t mk);
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template<typename traits = std::char_traits<toml::character>,
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typename alloc = std::allocator<toml::character>>
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std::basic_string<toml::character, traits, alloc>
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format(const toml::key& k, const value& v);
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template<typename traits = std::char_traits<toml::character>,
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typename alloc = std::allocator<toml::character>>
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std::basic_string<toml::character, traits, alloc>
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format(const toml::key& k, const value& v, std::size_t mk);
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template<value_t Type>
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struct format_impl;
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template<> struct format_impl<value_t::Boolean>
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{
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typedef detail::toml_default_type<value_t::Boolean>::type type;
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std::basic_string<toml::character>
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operator()(const type& val)
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{
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return val ? "true" : "false";
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}
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};
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template<> struct format_impl<value_t::Integer>
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{
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typedef detail::toml_default_type<value_t::Integer>::type type;
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std::basic_string<toml::character>
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operator()(const type& val)
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{
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return std::to_string(val);
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}
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};
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template<> struct format_impl<value_t::Float>
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{
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typedef detail::toml_default_type<value_t::Float>::type type;
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std::basic_string<toml::character>
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operator()(const type& val)
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{
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std::basic_ostringstream<toml::character> oss;
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oss << std::showpoint << val;
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if(oss.str().back() == '.') oss << '0';
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return oss.str();
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}
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};
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template<> struct format_impl<value_t::String>
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{
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typedef detail::toml_default_type<value_t::String>::type type;
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std::size_t max_length;
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format_impl() : max_length(80){}
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format_impl(std::size_t mx) : max_length(mx){}
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std::basic_string<toml::character>
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operator()(const type& val)
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{
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auto tmp = make_inline(val);
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if(max_length == std::numeric_limits<std::size_t>::max() ||
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tmp.size() <= max_length) return tmp;
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return convert_multiline(std::move(tmp));
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}
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private:
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std::basic_string<toml::character>
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make_inline(const std::basic_string<toml::character>& val)
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{
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std::basic_string<toml::character> str;
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str += '"';
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for(const auto& c : val)
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{
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if('\0' < c && c < '\31')
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{
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switch(c)
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{
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case '\b': str += "\\b"; break;
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case '\t': str += "\\t"; break;
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case '\n': str += "\\n"; break;
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case '\f': str += "\\f"; break;
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case '\r': str += "\\r"; break;
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default:
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{
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str += 'u';
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std::basic_ostringstream<toml::character> oss;
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oss << std::setw(4) << std::setfill('0') << std::hex
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<< static_cast<std::int8_t>(c);
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auto hexdig = oss.str();
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std::transform(hexdig.begin(), hexdig.end(), hexdig.begin(), ::toupper);
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str += oss.str();
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break;
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}
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}
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}
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else if(c == '"')
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{
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str += "\\\"";
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}
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else if(c == '\\')
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{
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str += "\\\\";
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}
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else
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{
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str += c;
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}
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}
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str += '"';
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return str;
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}
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std::basic_string<toml::character>
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convert_multiline(std::basic_string<toml::character>&& val)
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{
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std::basic_string<toml::character> str; str.reserve(val.size() + 6);
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str += "\"\"\"\n";
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std::size_t current = 0;
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for(auto iter = val.begin()+1; iter != val.end()-1; ++iter)
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{
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if(*iter != '\\')
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{
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if(current + 1 == max_length) str += "\\\n";
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str += *iter; continue;
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}
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assert(std::next(iter) < val.end()-1);
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if(*std::next(iter) == 'u')
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{
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if(current + 5 == max_length) str += "\\\n";
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assert(iter + 5 < val.end()-1);
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str += *iter; ++iter; // u
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str += *iter; ++iter; // 0
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str += *iter; ++iter; // 1
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str += *iter; ++iter; // 2
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str += *iter; continue;// 3
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}
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if(current + 2 == max_length) str += "\\\n";
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str += *iter; ++iter; str += *iter;
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}
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str += "\"\"\"";
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return str;
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}
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};
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template<> struct format_impl<value_t::Datetime>
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{
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typedef detail::toml_default_type<value_t::Datetime>::type type;
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std::basic_string<toml::character>
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operator()(const type& val)
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{
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std::basic_ostringstream<toml::character> oss;
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oss << val;
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return oss.str();
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}
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};
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// TODO max length!
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template<> struct format_impl<value_t::Array>
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{
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typedef detail::toml_default_type<value_t::Array>::type type;
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std::size_t max_length;
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format_impl() : max_length(80){}
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format_impl(std::size_t mx) : max_length(mx){}
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std::basic_string<toml::character>
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operator()(const type& val)
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{
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std::basic_string<toml::character> retval;
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retval += '[';
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for(const auto& item : val)
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{
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auto tmp = format(val, max_length - 1);
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retval += tmp;
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retval += ", ";
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if(tmp.size() * 2 > max_length) retval += '\n';
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}
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retval += ']';
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return retval;
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}
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};
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// TODO max length && inline!
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template<> struct format_impl<value_t::Table>
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{
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typedef detail::toml_default_type<value_t::Table>::type type;
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std::size_t max_length;
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format_impl() : max_length(80){}
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format_impl(std::size_t mx) : max_length(mx){}
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std::basic_string<toml::character>
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operator()(const type& val)
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{
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std::basic_string<toml::character> retval;
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for(const auto& item : val)
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{
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retval += item.first;
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retval += " = ";
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retval += format(item.second);
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retval += '\n';
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}
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return retval;
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}
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};
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template<typename traits, typename alloc>
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std::basic_string<toml::character, traits, alloc>
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format(const value& v)
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{
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switch(v.type())
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{
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case value_t::Boolean : return format_impl<value_t::Boolean >{}(v.template cast<value_t::Boolean >());
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case value_t::Integer : return format_impl<value_t::Integer >{}(v.template cast<value_t::Integer >());
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case value_t::Float : return format_impl<value_t::Float >{}(v.template cast<value_t::Float >());
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case value_t::String : return format_impl<value_t::String >{}(v.template cast<value_t::String >());
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case value_t::Datetime: return format_impl<value_t::Datetime>{}(v.template cast<value_t::Datetime>());
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case value_t::Array : return format_impl<value_t::Array >{}(v.template cast<value_t::Array >());
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case value_t::Table : return format_impl<value_t::Table >{}(v.template cast<value_t::Table >());
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case value_t::Empty : throw std::runtime_error("toml::format: empty value");
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case value_t::Unknown : throw std::runtime_error("toml::format: unknown value");
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default: throw std::logic_error("toml::format: unknown enum value");
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}
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}
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template<typename traits, typename alloc>
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std::basic_string<toml::character, traits, alloc>
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format(const value& v, std::size_t inl)
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{
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switch(v.type())
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{
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case value_t::Boolean : return format_impl<value_t::Boolean >{}(v.template cast<value_t::Boolean>());
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case value_t::Integer : return format_impl<value_t::Integer >{}(v.template cast<value_t::Integer>());
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case value_t::Float : return format_impl<value_t::Float >{}(v.template cast<value_t::Float>());
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case value_t::String : return format_impl<value_t::String >{inl}(v.template cast<value_t::String>());
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case value_t::Datetime: return format_impl<value_t::Datetime>{}(v.template cast<value_t::Datetime>());
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case value_t::Array : return format_impl<value_t::Array >{inl}(v.template cast<value_t::Array>());
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case value_t::Table : return format_impl<value_t::Table >{inl}(v.template cast<value_t::Table>());
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case value_t::Empty : throw std::runtime_error("toml::format: empty value");
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case value_t::Unknown : throw std::runtime_error("toml::format: unknown value");
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default: throw std::logic_error("toml::format: unknown enum value");
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}
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}
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template<typename traits, typename alloc>
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std::basic_string<toml::character, traits, alloc>
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format(std::basic_string<toml::character, traits, alloc> key, const value& val)
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{
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std::basic_string<toml::character, traits, alloc> retval(std::move(key));
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retval += " = ";
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retval += format(val);
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return retval;
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}
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template<typename traits, typename alloc>
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std::basic_string<toml::character, traits, alloc>
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format(std::basic_string<toml::character, traits, alloc> key, const value& val, std::size_t mk)
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{
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std::basic_string<toml::character, traits, alloc> retval(std::move(key));
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retval += " = ";
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retval += format(val, mk);
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return retval;
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}
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// ----------------------------- stream operators -----------------------------
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namespace detail
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{
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template<typename T = std::size_t>
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struct inline_limit
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{
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static_assert(std::is_same<T, std::size_t>::value, "do not instantiate this");
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static const int index;
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T limit;
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inline_limit() = default;
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~inline_limit() = default;
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constexpr inline_limit(T i): limit(i){}
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constexpr operator T() const {return limit;}
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static void callback(std::ios_base::event ev, std::ios_base& ios, int idx)
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{
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void*& info = ios.pword(idx);
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switch (ev)
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{
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case std::ios_base::erase_event:
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{
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delete static_cast<std::size_t*>(info);
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break;
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}
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case std::ios_base::copyfmt_event:
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{
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info = new std::size_t(*static_cast<std::size_t*>(info));
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break;
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}
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case std::ios_base::imbue_event:
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{
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break;
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}
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}
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}
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};
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template<typename T>
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const int inline_limit<T>::index = std::ios_base::xalloc();
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} //detail
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template<typename sizeT, typename traits = std::char_traits<toml::character>>
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std::basic_ostream<toml::character, traits>&
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operator<<(std::basic_ostream<toml::character, traits>& os,
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const detail::inline_limit<sizeT>& inl)
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{
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void*& info = os.pword(detail::inline_limit<sizeT>::index);
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if(!os.bad())
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{
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if(info == nullptr)
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{
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os.register_callback(detail::inline_limit<sizeT>::callback,
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detail::inline_limit<sizeT>::index);
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info = new std::size_t(inl.limit);
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}
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else
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{
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*static_cast<std::size_t*>(info) = inl.limit;
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}
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}
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return os;
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}
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constexpr static detail::inline_limit<std::size_t> forceinline(
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std::numeric_limits<std::size_t>::max());
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inline detail::inline_limit<std::size_t> make_inline(std::size_t sz)
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{
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return detail::inline_limit<std::size_t>(sz);
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}
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template<typename T, typename traits = std::char_traits<toml::character>>
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std::basic_ostream<toml::character, traits>&
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operator<<(std::basic_ostream<toml::character, traits>& os,
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const toml::value& v)
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{
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std::size_t* info =
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static_cast<std::size_t*>(os.pword(detail::inline_limit<std::size_t>::index));
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return os << (info == nullptr ? toml::format(v) : toml::format(v, *info));
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}
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}
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#endif // TOML11_FORMAT
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