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#ifndef LM_FILTER_COUNT_IO__
#define LM_FILTER_COUNT_IO__
#include <fstream>
#include <iostream>
#include <string>
#if !defined __MINGW32__
#include <err.h>
#endif
#include "util/file_piece.hh"
namespace lm {
class CountOutput : boost::noncopyable {
public:
explicit CountOutput(const char *name) : file_(name, std::ios::out) {}
void AddNGram(const StringPiece &line) {
if (!(file_ << line << '\n')) {
#if defined __MINGW32__
std::cerr<<"Writing counts file failed"<<std::endl;
exit(3);
#else
err(3, "Writing counts file failed");
#endif
}
}
template <class Iterator> void AddNGram(const Iterator &begin, const Iterator &end, const StringPiece &line) {
AddNGram(line);
}
void AddNGram(const StringPiece &ngram, const StringPiece &line) {
AddNGram(line);
}
private:
std::fstream file_;
};
class CountBatch {
public:
explicit CountBatch(std::streamsize initial_read)
: initial_read_(initial_read) {
buffer_.reserve(initial_read);
}
void Read(std::istream &in) {
buffer_.resize(initial_read_);
in.read(&*buffer_.begin(), initial_read_);
buffer_.resize(in.gcount());
char got;
while (in.get(got) && got != '\n')
buffer_.push_back(got);
}
template <class Output> void Send(Output &out) {
for (util::TokenIter<util::SingleCharacter> line(StringPiece(&*buffer_.begin(), buffer_.size()), '\n'); line; ++line) {
util::TokenIter<util::SingleCharacter> tabber(*line, '\t');
if (!tabber) {
std::cerr << "Warning: empty n-gram count line being removed\n";
continue;
}
util::TokenIter<util::SingleCharacter, true> words(*tabber, ' ');
if (!words) {
std::cerr << "Line has a tab but no words.\n";
continue;
}
out.AddNGram(words, util::TokenIter<util::SingleCharacter, true>::end(), *line);
}
}
private:
std::streamsize initial_read_;
// This could have been a std::string but that's less happy with raw writes.
std::vector<char> buffer_;
};
template <class Output> void ReadCount(util::FilePiece &in_file, Output &out) {
try {
while (true) {
StringPiece line = in_file.ReadLine();
util::TokenIter<util::SingleCharacter> tabber(line, '\t');
if (!tabber) {
std::cerr << "Warning: empty n-gram count line being removed\n";
continue;
}
out.AddNGram(*tabber, line);
}
} catch (const util::EndOfFileException &e) {}
}
} // namespace lm
#endif // LM_FILTER_COUNT_IO__
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