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// Copyright 2021 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_BUFFER_READER_HPP
#define JSONCONS_BUFFER_READER_HPP
#include <cstddef>
#include <string>
#include <vector>
#include <stdexcept>
#include <system_error>
#include <memory> // std::allocator_traits
#include <vector> // std::vector
#include <jsoncons/unicode_traits.hpp>
#include <jsoncons/json_error.hpp> // json_errc
#include <jsoncons/source.hpp>
#include <jsoncons/json_exception.hpp>
namespace jsoncons {
// text_source_adaptor
template<class Source>
class text_source_adaptor
{
public:
using value_type = typename Source::value_type;
private:
Source source_;
bool bof_;
public:
text_source_adaptor()
: bof_(true)
{
}
template <class Sourceable>
text_source_adaptor(Sourceable&& source)
: source_(std::forward<Sourceable>(source)), bof_(true)
{
}
bool eof() const
{
return source_.eof();
}
bool is_error() const
{
return source_.is_error();
}
span<const value_type> read_buffer(std::error_code& ec)
{
if (source_.eof())
{
return span<const value_type>();
}
auto s = source_.read_buffer();
const value_type* data = s.data();
std::size_t length = s.size();
if (bof_ && length > 0)
{
auto r = unicode_traits::detect_encoding_from_bom(data, length);
if (!(r.encoding == unicode_traits::encoding_kind::utf8 || r.encoding == unicode_traits::encoding_kind::undetected))
{
ec = json_errc::illegal_unicode_character;
return span<const value_type>();
}
length -= (r.ptr - data);
data = r.ptr;
bof_ = false;
}
return span<const value_type>(data, length);
}
};
// json_source_adaptor
template<class Source>
class json_source_adaptor
{
public:
using value_type = typename Source::value_type;
private:
Source source_;
bool bof_;
public:
json_source_adaptor()
: bof_(true)
{
}
template <class Sourceable>
json_source_adaptor(Sourceable&& source)
: source_(std::forward<Sourceable>(source)), bof_(true)
{
}
bool eof() const
{
return source_.eof();
}
bool is_error() const
{
return source_.is_error();
}
span<const value_type> read_buffer(std::error_code& ec)
{
if (source_.eof())
{
return span<const value_type>();
}
auto s = source_.read_buffer();
const value_type* data = s.data();
std::size_t length = s.size();
if (bof_ && length > 0)
{
auto r = unicode_traits::detect_json_encoding(data, length);
if (!(r.encoding == unicode_traits::encoding_kind::utf8 || r.encoding == unicode_traits::encoding_kind::undetected))
{
ec = json_errc::illegal_unicode_character;
return span<const value_type>();
}
length -= (r.ptr - data);
data = r.ptr;
bof_ = false;
}
return span<const value_type>(data, length);
}
};
} // namespace jsoncons
#endif
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