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#include "yql_csv.h"
#include <util/string/split.h>
#include <util/string/escape.h>
namespace {
const char QUOTE_CH = '"';
const char ESCAPE_CH = '\\';
const char NULL_CH = '\0';
class TCsvLineParser {
public:
TCsvLineParser(const TStringBuf& line, char delimiter)
: Cur_(line.begin())
, End_(line.end())
, Delim_(delimiter)
, Prev_(NULL_CH) /* must differ from ESCAPE_CH */
{
}
bool Next(TStringBuf& token) {
if (Cur_ > End_) return false;
const char* tokenStart = Cur_;
while (Cur_ < End_ && (Prev_ == ESCAPE_CH || *Cur_ != QUOTE_CH) && *Cur_ != Delim_) Prev_ = *Cur_++;
if (Cur_ == End_) {
token = { tokenStart, Cur_ };
Prev_ = NULL_CH;
Cur_++;
return true;
}
if (Prev_ != ESCAPE_CH && *Cur_ == QUOTE_CH) {
Prev_ = *Cur_++;
tokenStart = Cur_;
while (Cur_ < End_) {
// find non escaped quote char
if (*Cur_ == QUOTE_CH && Prev_ != ESCAPE_CH) break;
Prev_ = *Cur_++;
}
if (Cur_ == End_)
ythrow yexception() << "expected closing \"";
token = { tokenStart, Cur_ };
Prev_ = *Cur_++; // skip closing quote char
if (Cur_ != End_ && *Cur_ != Delim_)
ythrow yexception() << "expected end of line or delimiter";
Prev_ = *Cur_++; // move out of buffer or skip delimiter
return true;
} else if (*Cur_ == Delim_) {
token = { tokenStart, Cur_ };
Prev_ = *Cur_++;
return true;
}
return false;
}
private:
const char* Cur_;
const char* End_;
const char Delim_;
char Prev_;
};
} // namspace
namespace NYql {
namespace NUtils {
///////////////////////////////////////////////////////////////////////////////
// TCsvInputStream
///////////////////////////////////////////////////////////////////////////////
TCsvInputStream::TCsvInputStream(IInputStream& slave, char delimiter)
: Slave_(slave)
, Delim_(delimiter)
{
}
TVector<TString> TCsvInputStream::ReadLine()
{
TVector<TString> parts;
TString line;
if (Slave_.ReadLine(line)) {
TCsvLineParser lineParser(line, Delim_);
TStringBuf token;
while (lineParser.Next(token)) {
parts.push_back(UnescapeC(token.data(), token.size()));
}
}
return parts;
}
TVector<TString> TCsvInputStream::ReadLineWithEscaping()
{
TVector<TString> parts;
TString line;
if (Slave_.ReadLine(line)) {
TCsvLineParser lineParser(line, Delim_);
TStringBuf token;
while (lineParser.Next(token)) {
parts.push_back(TString(token));
}
}
return parts;
}
///////////////////////////////////////////////////////////////////////////////
// TCsvInputStream
///////////////////////////////////////////////////////////////////////////////
TCsvInputBuffer::TCsvInputBuffer(const TStringBuf& buffer, char delimiter)
: Buffer_(buffer)
, Delim_(delimiter)
{
}
TVector<TString> TCsvInputBuffer::ReadLine()
{
TVector<TString> parts;
TStringBuf line;
if (Buffer_.ReadLine(line)) {
TCsvLineParser lineParser(line, Delim_);
TStringBuf token;
while (lineParser.Next(token)) {
parts.push_back(UnescapeC(token.data(), token.size()));
}
}
return parts;
}
TVector<TString> TCsvInputBuffer::ReadLineWithEscaping()
{
TVector<TString> parts;
TStringBuf line;
if (Buffer_.ReadLine(line)) {
TCsvLineParser lineParser(line, Delim_);
TStringBuf token;
while (lineParser.Next(token)) {
parts.push_back(TString(token.data(), token.size()));
}
}
return parts;
}
///////////////////////////////////////////////////////////////////////////////
// TCsvOutputStream
///////////////////////////////////////////////////////////////////////////////
TCsvOutputStream::TCsvOutputStream(IOutputStream& slave, char delimiter, bool quoteItems)
: Slave_(slave)
, WasNL_(true)
, Delim_(delimiter)
, QuoteItems_(quoteItems)
{
}
void TCsvOutputStream::DoWrite(const void* buf, size_t len)
{
TStringBuf charBuf(reinterpret_cast<const char*>(buf), len);
if (charBuf == TStringBuf("\n")) {
WasNL_ = true;
Slave_.Write(buf, len);
} else {
if (!WasNL_) Slave_.Write(Delim_);
WasNL_ = false;
if (QuoteItems_) {
Slave_.Write(QUOTE_CH);
}
Slave_.Write(EscapeC(charBuf));
if (QuoteItems_) {
Slave_.Write(QUOTE_CH);
}
}
}
void TCsvOutputStream::DoFlush() {
Slave_.Flush();
}
} // namspace NUtils
} // namspace NYql
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