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// Copyright 2020 Daniel Parker
// Distributed under the Boost license, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See https://github.com/danielaparker/jsoncons for latest version
#ifndef JSONCONS_CONVERTER_HPP
#define JSONCONS_CONVERTER_HPP
#include <system_error> // std::error_code
#include <jsoncons/more_type_traits.hpp>
#include <jsoncons/byte_string.hpp>
#include <jsoncons/json_type.hpp>
#include <jsoncons/conv_error.hpp>
#include <jsoncons/detail/write_number.hpp> // from_integer
namespace jsoncons {
template <class Into, class Enable=void>
class converter
{
};
// Into list like of bytes
template <class Into>
class converter<Into,typename std::enable_if<(!type_traits::is_basic_string<Into>::value &&
type_traits::is_back_insertable_byte_container<Into>::value) ||
type_traits::is_basic_byte_string<Into>::value>::type>
{
using value_type = typename Into::value_type;
using allocator_type = typename Into::allocator_type;
public:
JSONCONS_CPP14_CONSTEXPR
Into from(const byte_string_view& bstr, semantic_tag tag, std::error_code& ec) const
{
Into bytes;
from_(bytes, bstr, tag, ec);
return bytes;
}
JSONCONS_CPP14_CONSTEXPR
Into from(const byte_string_view& bstr, semantic_tag tag, const allocator_type& alloc, std::error_code& ec) const
{
Into bytes(alloc);
from_(bytes, bstr, tag, ec);
return bytes;
}
template <class CharT>
JSONCONS_CPP14_CONSTEXPR
Into from(const jsoncons::basic_string_view<CharT>& s, semantic_tag tag, std::error_code& ec) const
{
Into bytes;
from_(bytes, s, tag, ec);
return bytes;
}
template <class CharT>
JSONCONS_CPP14_CONSTEXPR
Into from(const jsoncons::basic_string_view<CharT>& s, semantic_tag tag, const allocator_type& alloc, std::error_code& ec) const
{
Into bytes(alloc);
from_(bytes, s, tag, ec);
return bytes;
}
private:
JSONCONS_CPP14_CONSTEXPR
void from_(Into& bytes, const byte_string_view& bstr, semantic_tag, std::error_code&) const
{
for (auto ch : bstr)
{
bytes.push_back(static_cast<value_type>(ch));
}
}
template <class CharT>
JSONCONS_CPP14_CONSTEXPR
typename std::enable_if<type_traits::is_narrow_character<CharT>::value>::type
from_(Into& bytes, const jsoncons::basic_string_view<CharT>& s, semantic_tag tag, std::error_code& ec) const
{
switch (tag)
{
case semantic_tag::base16:
{
auto res = decode_base16(s.begin(), s.end(), bytes);
if (res.ec != conv_errc::success)
{
ec = conv_errc::not_byte_string;
}
break;
}
case semantic_tag::base64:
{
decode_base64(s.begin(), s.end(), bytes);
break;
}
case semantic_tag::base64url:
{
decode_base64url(s.begin(), s.end(), bytes);
break;
}
default:
{
ec = conv_errc::not_byte_string;
break;
}
}
}
template <class CharT>
typename std::enable_if<type_traits::is_wide_character<CharT>::value>::type
from_(Into& bytes, const jsoncons::basic_string_view<CharT>& s, semantic_tag tag, std::error_code& ec) const
{
std::string u;
auto retval = unicode_traits::convert(s.data(), s.size(), u);
if (retval.ec != unicode_traits::conv_errc())
{
ec = conv_errc::not_utf8;
return;
}
from_(bytes, jsoncons::string_view(u), tag, ec);
}
};
// Into string
template <class Into>
class converter<Into,typename std::enable_if<type_traits::is_basic_string<Into>::value>::type>
{
using char_type = typename Into::value_type;
using allocator_type = typename Into::allocator_type;
int dummy_;
public:
explicit converter(int dummy = int())
: dummy_(dummy)
{}
template<class Integer>
JSONCONS_CPP14_CONSTEXPR
typename std::enable_if<type_traits::is_integer<Integer>::value,Into>::type
from(Integer val, semantic_tag, std::error_code&) const
{
Into s;
jsoncons::detail::from_integer(val, s);
return s;
}
template<class Integer>
JSONCONS_CPP14_CONSTEXPR
typename std::enable_if<type_traits::is_integer<Integer>::value,Into>::type
from(Integer val, semantic_tag, const allocator_type& alloc, std::error_code&) const
{
Into s(alloc);
jsoncons::detail::from_integer(val, s);
return s;
}
Into from(double val, semantic_tag, std::error_code&) const
{
Into s;
jsoncons::detail::write_double f{float_chars_format::general,0};
f(val, s);
return s;
}
Into from(double val, semantic_tag, const allocator_type& alloc, std::error_code&) const
{
Into s(alloc);
jsoncons::detail::write_double f{float_chars_format::general,0};
f(val, s);
return s;
}
Into from(half_arg_t, uint16_t val, semantic_tag, std::error_code&) const
{
Into s;
jsoncons::detail::write_double f{float_chars_format::general,0};
double x = binary::decode_half(val);
f(x, s);
return s;
}
Into from(half_arg_t, uint16_t val, semantic_tag, const allocator_type& alloc, std::error_code&) const
{
Into s(alloc);
jsoncons::detail::write_double f{float_chars_format::general,0};
double x = binary::decode_half(val);
f(x, s);
return s;
}
template <class ChT = char_type>
JSONCONS_CPP14_CONSTEXPR
Into from(const byte_string_view& bytes, semantic_tag tag, std::error_code& ec) const
{
Into s;
from_(s, bytes, tag, ec);
return s;
}
template <class ChT = char_type>
JSONCONS_CPP14_CONSTEXPR
Into from(const byte_string_view& bytes, semantic_tag tag, const allocator_type& alloc, std::error_code& ec) const
{
Into s(alloc);
from_(s, bytes, tag, ec);
return s;
}
constexpr
Into from(const jsoncons::basic_string_view<char_type>& s, semantic_tag, std::error_code&) const
{
return Into(s.data(), s.size());
}
constexpr
Into from(const jsoncons::basic_string_view<char_type>& s, semantic_tag, const allocator_type& alloc, std::error_code&) const
{
return Into(s.data(), s.size(), alloc);
}
JSONCONS_CPP14_CONSTEXPR
Into from(bool val, semantic_tag, std::error_code&) const
{
constexpr const char_type* true_constant = JSONCONS_CSTRING_CONSTANT(char_type,"true");
constexpr const char_type* false_constant = JSONCONS_CSTRING_CONSTANT(char_type,"false");
return val ? Into(true_constant,4) : Into(false_constant,5);
}
JSONCONS_CPP14_CONSTEXPR
Into from(bool val, semantic_tag, const allocator_type& alloc, std::error_code&) const
{
constexpr const char_type* true_constant = JSONCONS_CSTRING_CONSTANT(char_type,"true");
constexpr const char_type* false_constant = JSONCONS_CSTRING_CONSTANT(char_type,"false");
return val ? Into(true_constant,4,alloc) : Into(false_constant,5,alloc);
}
JSONCONS_CPP14_CONSTEXPR
Into from(null_type, semantic_tag, std::error_code&) const
{
constexpr const char_type* null_constant = JSONCONS_CSTRING_CONSTANT(char_type,"null");
return Into(null_constant,4);
}
JSONCONS_CPP14_CONSTEXPR
Into from(null_type, semantic_tag, const allocator_type& alloc, std::error_code&) const
{
constexpr const char_type* null_constant = JSONCONS_CSTRING_CONSTANT(char_type,"null");
return Into(null_constant,4,alloc);
}
private:
template <class ChT = char_type>
JSONCONS_CPP14_CONSTEXPR
typename std::enable_if<type_traits::is_byte<ChT>::value>::type
from_(Into& s, const byte_string_view& bytes, semantic_tag tag, std::error_code&) const
{
switch (tag)
{
case semantic_tag::base64:
encode_base64(bytes.begin(), bytes.end(), s);
break;
case semantic_tag::base16:
encode_base16(bytes.begin(), bytes.end(), s);
break;
default:
encode_base64url(bytes.begin(), bytes.end(), s);
break;
}
}
template <class ChT = char_type>
typename std::enable_if<!type_traits::is_byte<ChT>::value>::type
from_(Into& s, const byte_string_view& bytes, semantic_tag tag, std::error_code& ec) const
{
converter<std::string> convert{ dummy_ };
std::string u = convert.from(bytes, tag, ec);
auto retval = unicode_traits::convert(u.data(), u.size(), s);
if (retval.ec != unicode_traits::conv_errc())
{
ec = conv_errc::not_wide_char;
}
}
};
} // namespace jsoncons
#endif
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