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| #ifndef CSV_PARSER_CORE_H
#define CSV_PARSER_CORE_H
template<class csv_traits, class csv_policy>
class csv_parser_core : private csv_traits, public csv_policy
{
private:
typename csv_traits::stream_type& _stream;
enum parser_mode {
initial,
normal,
inside_escape,
inside_delimiter,
inside_escape_delimiter,
outside_delimiter
};
bool _recordEnded;
public:
csv_parser_core(typename csv_traits::stream_type& s) : _stream(s),
_recordEnded(false)
{
csv_traits::initialize(_stream);
}
public:
typename csv_traits::string_type get_next_value()
{
typename csv_traits::char_type c;
typename csv_traits::string_type current;
parser_mode mode = initial;
_recordEnded = false;
while(_stream.good())
{
c = _stream.get();
if(mode == initial)
{
if(csv_traits::is_delimiter(c))
mode = inside_delimiter;
else if(csv_traits::is_escape(c))
mode = inside_escape;
else if(csv_traits::is_field_separator(c))
return current;
else if(csv_traits::is_record_separator(c))
{
_recordEnded = true;
return current;
}
else
{
mode = normal;
current.push_back(c);
}
}
else if(mode == normal)
{
if(csv_traits::is_escape(c))
mode = inside_escape;
else if(csv_traits::is_field_separator(c))
{
mode = initial;
return current;
}
else if(csv_traits::is_record_separator(c))
{
mode = initial;
_recordEnded = true;
return current;
}
else
current.push_back(c);
}
else if(mode == inside_delimiter)
{
if(csv_traits::is_escape(c))
{
if(csv_traits::escape_is_delimiter())
mode = inside_escape_delimiter;
else
current.push_back(c);
}
else if(csv_traits::is_delimiter(c))
mode = outside_delimiter;
else
current.push_back(c);
}
else if(mode == inside_escape)
{
mode = normal;
current.push_back(c);
}
else if(mode == inside_escape_delimiter)
{
if(csv_traits::is_delimiter(c))
{ // c'est un délimiteur échappé
current.push_back(c);
mode = inside_delimiter;
}
else if(csv_traits::is_field_separator(c))
{ // c'était bien un délimiteur
mode = initial;
return current;
}
else if(csv_traits::is_record_separator(c))
{ // même remarque
mode = initial;
_recordEnded = true;
return current;
}
else
csv_policy::handle_error();
}
else if(mode == outside_delimiter)
{
if(csv_traits::is_field_separator(c))
{
mode = initial;
return current;
}
else if(csv_traits::is_record_separator(c))
{
mode = initial;
_recordEnded = true;
return current;
}
else
csv_policy::handle_error();
}
else
csv_policy::handle_error();
}
if(!_stream.good() && _stream.eof())
{
if(mode == normal || mode == initial || mode == outside_delimiter)
{
_recordEnded = true;
return current;
}
else
csv_policy::handle_error();
}
return current;
}
bool good()
{
return _stream.good();
}
bool record_ended()
{
return _recordEnded;
}
}; |
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