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#include "csvparser/csv.h"
namespace io{
namespace error{
struct escaped_char_missing :
base,
with_file_name,
with_file_line{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
"Escaped character missing in line %d in file \"%s\"."
, file_line, file_name);
}
};
struct missmatch_of_begin_end :
base,
with_file_name,
with_file_line{
int begin=-1,end=-1;
void set_begin_end(int b,int e){
begin=b;
end=e;
}
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
"***missmatch_of_begin_end*** Line number %d in file \"%s\" begin{%d} > end{%d}"
,file_line, file_name,begin,end);
}
};
struct missmatch_end :
base,
with_file_name,
with_file_line{
int end=-1;
int block_size=-1;
void set_end_block(int e,int b){
end = e;
block_size = b;
}
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
"***missmatch_end*** Line number %d in file \"%s\" end{%d} block{%d}"
,file_line, file_name, end, block_size);
}
};
struct line_is_null :
base,
with_file_name,
with_file_line{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
"***line is NULL*** Line number %d in file \"%s\""
,file_line, file_name);
}
};
}
namespace detail{
static void unescape(char*&col_begin, char*&col_end, char& quote, char& escape_char)
{
if(col_end - col_begin >= 2)
{
while(*col_begin == quote && *(col_begin + 1) == quote)
{
++col_begin;
++col_begin;
}
char*out = col_begin;
char* in = col_begin;
bool init = true;
while(in != col_end)
{
if(*in != quote && *in != escape_char)
{
if(init)
{
init = false;
}
else
{
*out = *in;
}
++in;
++out;
}
else
{
if(*in == escape_char)
{
++in;
if(init)
{
++col_begin;
++out;
init = false;
}
else
{
*out = *in;
}
++in;
++out;
}
else
{
++in;
while(*in != quote)
{
if(init)
{
++col_begin;
++out;
init = false;
}
else
{
*out = *in;
}
++in;
++out;
}
++in;
}
}
}
*out = '\0';
col_end = out;
}
}
static void trim(char*&str_begin, char*&str_end, std::vector<char>& trim_chars)
{
while(str_begin != str_end && std::find(trim_chars.begin(), trim_chars.end(), *str_begin) != trim_chars.end())
++str_begin;
while(str_begin != str_end && std::find(trim_chars.begin(), trim_chars.end(), *(str_end-1)) != trim_chars.end())
--str_end;
*str_end = '\0';
}
static const char*find_next_column_end(const char*col_begin, char& sep, char& quote, char& escape_char)
{
while(*col_begin != sep && *col_begin != '\0')
{
if(*col_begin != quote && *col_begin != escape_char)
++col_begin;
else
{
if(*col_begin == escape_char)
{
if(*(col_begin+1) == '\0')
throw error::escaped_char_missing();
col_begin += 2;
}
else
{
do
{
++col_begin;
while(*col_begin != quote)
{
if(*col_begin == '\0')
throw error::escaped_string_not_closed();
++col_begin;
}
++col_begin;
}while(*col_begin == quote);
}
}
}
return col_begin;
}
void chop_next_column(char*&line, char*&col_begin, char*&col_end, char& col_delimiter, char& quote, char& escape_char)
{
if(line == NULL)
{
io::error::line_is_null err;
throw err;
}
col_begin = line;
// the col_begin + (... - col_begin) removes the constness
col_end = col_begin + (find_next_column_end(col_begin, col_delimiter, quote, escape_char) - col_begin);
if(*col_end == '\0')
{
line = nullptr;
}
else
{
*col_end = '\0';
line = col_end + 1;
}
}
void parse_line(char*line, std::vector<char*>& sorted_col, char& col_delimiter, char& quote, char& escape_char, std::vector<char>& trim_chars)
{
while (line != nullptr)
{
char*col_begin, *col_end;
chop_next_column(line, col_begin, col_end, col_delimiter, quote, escape_char);
if (!trim_chars.empty())
trim(col_begin, col_end, trim_chars);
if (!(quote == '\0' && escape_char == '\0'))
unescape(col_begin, col_end, quote, escape_char);
sorted_col.push_back(col_begin);
}
}
bool empty_comment_line(char* line)
{
if(*line == '\0')
return true;
while(*line == ' ' || *line == '\t')
{
++line;
if(*line == '\0')
return true;
}
return false;
}
bool single_line_comment(char start_char, std::vector<char>& comment_chars)
{
if(std::find(comment_chars.begin(), comment_chars.end(), start_char) != comment_chars.end())
return true;
else
return false;
}
bool is_comment(char*&line, bool& comment_empty_line, std::vector<char>& comment_chars)
{
if(!comment_empty_line && comment_chars.empty())
return false;
else if(comment_empty_line && comment_chars.empty())
return empty_comment_line(line);
else if(!comment_empty_line && !comment_chars.empty())
return single_line_comment(*line, comment_chars);
else
return empty_comment_line(line) || single_line_comment(*line, comment_chars);
}
}
}
class CSVParser
{
private:
char row_delimiter;
char col_delimiter;
char quote;
char escape_char;
bool comment_empty_line;
std::vector<char> comment_characters;
std::vector<char> trim_characters;
static const int block_len = 1<<20;
std::unique_ptr<char[]>buffer; // must be constructed before (and thus destructed after) the reader!
#ifdef CSV_IO_NO_THREAD
io::detail::SynchronousReader reader;
#else
io::detail::AsynchronousReader reader;
#endif
int data_begin;
int data_end;
char file_name[io::error::max_file_name_length+1];
unsigned file_line;
void init(std::unique_ptr<io::ByteSourceBase>byte_source)
{
file_line = 0;
buffer = std::unique_ptr<char[]>(new char[3*block_len]);
data_begin = 0;
data_end = byte_source->read(buffer.get(), 2*block_len);
// Ignore UTF-8 BOM
if(data_end >= 3 && buffer[0] == '\xEF' && buffer[1] == '\xBB' && buffer[2] == '\xBF')
data_begin = 3;
if(data_end == 2*block_len){
reader.init(std::move(byte_source));
reader.start_read(buffer.get() + 2*block_len, block_len);
}
}
public:
CSVParser() = delete;
CSVParser(const CSVParser&) = delete;
CSVParser&operator=(const CSVParser&);
CSVParser(const char*file_name, const char*data_begin, const char*data_end)
{
set_file_name(file_name);
init(std::unique_ptr<io::ByteSourceBase>(new io::detail::NonOwningStringByteSource(data_begin, data_end-data_begin)));
}
CSVParser(const std::string&file_name, const char*data_begin, const char*data_end)
{
set_file_name(file_name.c_str());
init(std::unique_ptr<io::ByteSourceBase>(new io::detail::NonOwningStringByteSource(data_begin, data_end-data_begin)));
}
void set_file_name(const std::string&file_name)
{
set_file_name(file_name.c_str());
}
void set_file_name(const char*file_name)
{
if(file_name != nullptr)
{
strncpy(this->file_name, file_name, sizeof(this->file_name));
this->file_name[sizeof(this->file_name)-1] = '\0';
}
else
{
this->file_name[0] = '\0';
}
}
const char*get_truncated_file_name()const
{
return file_name;
}
void set_file_line(unsigned file_line)
{
this->file_line = file_line;
}
unsigned get_file_line()const
{
return file_line;
}
void set_csv_def(char& row_delimit, char& col_delimit, char& quote_char, char& escp_char, bool& cmnt_empty_line, std::vector<char>& comment_chars , std::vector<char>& trim_chars)
{
row_delimiter = row_delimit;
col_delimiter = col_delimit;
quote = quote_char;
escape_char = escp_char;
comment_empty_line = cmnt_empty_line;
comment_characters.assign(comment_chars.begin(), comment_chars.end());
trim_characters.assign(trim_chars.begin(), trim_chars.end());
}
char*next_line()
{
if(data_begin == data_end)
return nullptr;
++file_line;
if(data_begin > data_end)
{
io::error::missmatch_of_begin_end err;
err.set_begin_end(data_begin,data_end);
throw err;
}
if(data_end > block_len*2)
{
io::error::missmatch_end err;
err.set_end_block(data_end,block_len*2);
throw err;
}
if(data_begin >= block_len)
{
std::memcpy(buffer.get(), buffer.get()+block_len, block_len);
data_begin -= block_len;
data_end -= block_len;
if(reader.is_valid())
{
data_end += reader.finish_read();
std::memcpy(buffer.get()+block_len, buffer.get()+2*block_len, block_len);
reader.start_read(buffer.get() + 2*block_len, block_len);
}
}
int line_end = data_begin;
while(line_end != data_end && buffer[line_end] != row_delimiter)
{
if(buffer[line_end] == quote || buffer[line_end] == escape_char)
{
if(buffer[line_end] == escape_char)
{
++line_end;
if(line_end == data_end)
{
throw io::error::escaped_char_missing();
}
else if(buffer[line_end] == '\r' && buffer[line_end + 1] == '\n') // handle windows \r\n-line breaks
{
++line_end;
}
}
else
{
++line_end;
while(buffer[line_end] != quote)
{
if(line_end == data_end)
throw io::error::escaped_string_not_closed();
++line_end;
}
}
}
++line_end;
}
if(line_end - data_begin + 1 > block_len)
{
io::error::line_length_limit_exceeded err;
err.set_file_name(file_name);
err.set_file_line(file_line);
throw err;
}
if(line_end != data_end && buffer[line_end] == row_delimiter)
{
buffer[line_end] = '\0';
}
else
{
// some files are missing the newline at the end of the
// last line
++data_end;
buffer[line_end] = '\0';
}
// handle windows \r\n-line breaks
if(row_delimiter == '\n')
{
if(line_end != data_begin && buffer[line_end-1] == '\r')
buffer[line_end-1] = '\0';
}
char*ret = buffer.get() + data_begin;
data_begin = line_end+1;
return ret;
}
bool read_row(std::vector<char*>& cols)
{
try{
try{
char*line;
do{
line = next_line();
if(!line)
return false;
}while(io::detail::is_comment(line, comment_empty_line, comment_characters));
io::detail::parse_line(line, cols, col_delimiter, quote, escape_char, trim_characters);
}catch(io::error::with_file_name&err){
err.set_file_name(get_truncated_file_name());
throw;
}
}catch(io::error::with_file_line&err){
err.set_file_line(get_file_line());
throw;
}
return true;
}
};
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