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// Copyright 2013 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 <string>
#include <sstream>
#include <vector>
#include <istream>
#include <cstdlib>
#include <stdexcept>
#include "jsoncons/jsoncons.hpp"
#include "jsoncons/json_input_handler.hpp"
#include "jsoncons/parse_error_handler.hpp"
#include "jsoncons_ext/csv/csv_error_category.hpp"
#include "jsoncons_ext/csv/csv_parser.hpp"
#include "jsoncons/json.hpp"
namespace jsoncons { namespace csv {
template<typename CharT>
class basic_csv_reader
{
struct stack_item
{
stack_item()
: array_begun_(false)
{
}
bool array_begun_;
};
public:
// Structural characters
static const size_t default_max_buffer_length = 16384;
//! Parse an input stream of CSV text into a json object
/*!
\param is The input stream to read from
*/
basic_csv_reader(std::basic_istream<CharT>& is,
basic_json_input_handler<CharT>& handler)
: parser_(handler),
is_(std::addressof(is)),
buffer_(default_max_buffer_length),
buffer_capacity_(default_max_buffer_length),
buffer_position_(0),
buffer_length_(0),
eof_(false),
index_(0)
{
}
basic_csv_reader(std::basic_istream<CharT>& is,
basic_json_input_handler<CharT>& handler,
basic_csv_parameters<CharT> params)
: parser_(handler,params),
is_(std::addressof(is)),
buffer_(default_max_buffer_length),
buffer_capacity_(default_max_buffer_length),
buffer_position_(0),
buffer_length_(0),
eof_(false),
index_(0)
{
}
basic_csv_reader(std::basic_istream<CharT>& is,
basic_json_input_handler<CharT>& handler,
basic_parse_error_handler<CharT>& err_handler)
:
parser_(handler,err_handler),
is_(std::addressof(is)),
buffer_(),
buffer_capacity_(default_max_buffer_length),
buffer_position_(0),
buffer_length_(0),
eof_(false),
index_(0)
{
}
basic_csv_reader(std::basic_istream<CharT>& is,
basic_json_input_handler<CharT>& handler,
basic_parse_error_handler<CharT>& err_handler,
basic_csv_parameters<CharT> params)
:
parser_(handler,err_handler,params),
is_(std::addressof(is)),
buffer_(),
buffer_capacity_(default_max_buffer_length),
buffer_position_(0),
buffer_length_(0),
eof_(false),
index_(0)
{
}
~basic_csv_reader()
{
}
void read()
{
parser_.begin_parse();
while (!eof_ && !parser_.done())
{
if (!(index_ < buffer_length_))
{
if (!is_->eof())
{
is_->read(buffer_.data(), buffer_capacity_);
buffer_length_ = static_cast<size_t>(is_->gcount());
if (buffer_length_ == 0)
{
eof_ = true;
}
index_ = 0;
}
else
{
eof_ = true;
}
}
if (!eof_)
{
parser_.parse(buffer_.data(),index_,buffer_length_);
index_ = parser_.index();
}
}
parser_.end_parse();
}
bool eof() const
{
return eof_;
}
size_t buffer_capacity() const
{
return buffer_capacity_;
}
void buffer_capacity(size_t buffer_capacity)
{
buffer_capacity_ = buffer_capacity;
}
private:
basic_csv_reader(const basic_csv_reader&) = delete;
basic_csv_reader& operator = (const basic_csv_reader&) = delete;
basic_csv_parser<CharT> parser_;
std::basic_istream<CharT>* is_;
std::vector<CharT> buffer_;
size_t buffer_capacity_;
size_t buffer_position_;
size_t buffer_length_;
bool eof_;
size_t index_;
};
typedef basic_csv_reader<char> csv_reader;
}}
#endif
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