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// Copyright 2013-2025 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_CSV_CSV_READER_HPP
#define JSONCONS_CSV_CSV_READER_HPP
#include <cstddef>
#include <functional>
#include <memory> // std::allocator
#include <system_error>
#include <utility> // std::move
#include <jsoncons/config/compiler_support.hpp>
#include <jsoncons/json_decoder.hpp>
#include <jsoncons/json_exception.hpp>
#include <jsoncons/json_reader.hpp>
#include <jsoncons/json_visitor.hpp>
#include <jsoncons/ser_context.hpp>
#include <jsoncons/source.hpp>
#include <jsoncons/source_adaptor.hpp>
#include <jsoncons_ext/csv/csv_error.hpp>
#include <jsoncons_ext/csv/csv_options.hpp>
#include <jsoncons_ext/csv/csv_parser.hpp>
namespace jsoncons { namespace csv {
template <typename CharT,typename Source=jsoncons::stream_source<CharT>,typename Allocator=std::allocator<char>>
class basic_csv_reader
{
struct stack_item
{
stack_item() noexcept
: array_begun_(false)
{
}
bool array_begun_;
};
using char_type = CharT;
using temp_allocator_type = Allocator;
using char_allocator_type = typename std::allocator_traits<temp_allocator_type>:: template rebind_alloc<CharT>;
basic_csv_reader(const basic_csv_reader&) = delete;
basic_csv_reader& operator = (const basic_csv_reader&) = delete;
basic_default_json_visitor<CharT> default_visitor_;
text_source_adaptor<Source> source_;
basic_json_visitor<CharT>& visitor_;
basic_csv_parser<CharT,Allocator> parser_;
public:
// Structural characters
static constexpr size_t default_max_buffer_size = 16384;
//! Parse an input stream of CSV text into a json object
/*!
\param is The input stream to read from
*/
template <typename Sourceable>
basic_csv_reader(Sourceable&& source,
basic_json_visitor<CharT>& visitor,
const Allocator& alloc = Allocator())
: basic_csv_reader(std::forward<Sourceable>(source),
visitor,
basic_csv_decode_options<CharT>(),
default_csv_parsing(),
alloc)
{
}
template <typename Sourceable>
basic_csv_reader(Sourceable&& source,
basic_json_visitor<CharT>& visitor,
const basic_csv_decode_options<CharT>& options,
const Allocator& alloc = Allocator())
: basic_csv_reader(std::forward<Sourceable>(source),
visitor,
options,
default_csv_parsing(),
alloc)
{
}
template <typename Sourceable>
basic_csv_reader(Sourceable&& source,
basic_json_visitor<CharT>& visitor,
std::function<bool(csv_errc,const ser_context&)> err_handler,
const Allocator& alloc = Allocator())
: basic_csv_reader(std::forward<Sourceable>(source),
visitor,
basic_csv_decode_options<CharT>(),
err_handler,
alloc)
{
}
template <typename Sourceable>
basic_csv_reader(Sourceable&& source,
basic_json_visitor<CharT>& visitor,
const basic_csv_decode_options<CharT>& options,
std::function<bool(csv_errc,const ser_context&)> err_handler,
const Allocator& alloc = Allocator())
: source_(std::forward<Sourceable>(source)),
visitor_(visitor),
parser_(options, err_handler, alloc)
{
}
~basic_csv_reader() noexcept = default;
void read()
{
std::error_code ec;
read(ec);
if (JSONCONS_UNLIKELY(ec))
{
JSONCONS_THROW(ser_error(ec,parser_.line(),parser_.column()));
}
}
void read(std::error_code& ec)
{
read_internal(ec);
}
std::size_t line() const
{
return parser_.line();
}
std::size_t column() const
{
return parser_.column();
}
bool eof() const
{
return parser_.source_exhausted() && source_.eof();
}
private:
void read_internal(std::error_code& ec)
{
if (source_.is_error())
{
ec = csv_errc::source_error;
return;
}
while (!parser_.stopped())
{
if (parser_.source_exhausted())
{
auto s = source_.read_buffer(ec);
if (JSONCONS_UNLIKELY(ec)) return;
if (s.size() > 0)
{
parser_.update(s.data(),s.size());
}
}
parser_.parse_some(visitor_, ec);
if (JSONCONS_UNLIKELY(ec)) return;
}
}
};
using csv_string_reader = basic_csv_reader<char,string_source<char>>;
using wcsv_string_reader = basic_csv_reader<wchar_t,string_source<wchar_t>>;
using csv_stream_reader = basic_csv_reader<char,stream_source<char>>;
using wcsv_stream_reader = basic_csv_reader<wchar_t,stream_source<wchar_t>>;
}}
#endif
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