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#include "lm/filter/arpa_io.hh"
#include "util/file_piece.hh"
#include <iostream>
#include <ostream>
#include <string>
#include <vector>
#include <ctype.h>
#include <errno.h>
#include <string.h>
namespace lm {
ARPAInputException::ARPAInputException(const StringPiece &message) throw() : what_("Error: ") {
what_.append(message.data(), message.size());
}
ARPAInputException::ARPAInputException(const StringPiece &message, const StringPiece &line) throw() {
what_ = "Error: ";
what_.append(message.data(), message.size());
what_ += " in line '";
what_.append(line.data(), line.size());
what_ += "'.";
}
ARPAOutputException::ARPAOutputException(const char *message, const std::string &file_name) throw()
: what_(std::string(message) + " file " + file_name), file_name_(file_name) {
if (errno) {
char buf[1024];
buf[0] = 0;
#if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && ! _GNU_SOURCE
const char *add = buf;
if (!strerror_r(errno, buf, 1024)) {
#else
const char *add = strerror_r(errno, buf, 1024);
if (add) {
#endif
what_ += " :";
what_ += add;
}
}
}
// Seeking is the responsibility of the caller.
void WriteCounts(std::ostream &out, const std::vector<size_t> &number) {
out << "\n\\data\\\n";
for (unsigned int i = 0; i < number.size(); ++i) {
out << "ngram " << i+1 << "=" << number[i] << '\n';
}
out << '\n';
}
size_t SizeNeededForCounts(const std::vector<size_t> &number) {
std::ostringstream buf;
WriteCounts(buf, number);
return buf.tellp();
}
bool IsEntirelyWhiteSpace(const StringPiece &line) {
for (size_t i = 0; i < static_cast<size_t>(line.size()); ++i) {
if (!isspace(line.data()[i])) return false;
}
return true;
}
ARPAOutput::ARPAOutput(const char *name, size_t buffer_size) : file_name_(name), buffer_(new char[buffer_size]) {
try {
file_.exceptions(std::ostream::eofbit | std::ostream::failbit | std::ostream::badbit);
if (!file_.rdbuf()->pubsetbuf(buffer_.get(), buffer_size)) {
std::cerr << "Warning: could not enlarge buffer for " << name << std::endl;
buffer_.reset();
}
file_.open(name, std::ios::out | std::ios::binary);
} catch (const std::ios_base::failure &f) {
throw ARPAOutputException("Opening", file_name_);
}
}
void ARPAOutput::ReserveForCounts(std::streampos reserve) {
try {
for (std::streampos i = 0; i < reserve; i += std::streampos(1)) {
file_ << '\n';
}
} catch (const std::ios_base::failure &f) {
throw ARPAOutputException("Writing blanks to reserve space for counts to ", file_name_);
}
}
void ARPAOutput::BeginLength(unsigned int length) {
fast_counter_ = 0;
try {
file_ << '\\' << length << "-grams:" << '\n';
} catch (const std::ios_base::failure &f) {
throw ARPAOutputException("Writing n-gram header to ", file_name_);
}
}
void ARPAOutput::EndLength(unsigned int length) {
try {
file_ << '\n';
} catch (const std::ios_base::failure &f) {
throw ARPAOutputException("Writing blank at end of count list to ", file_name_);
}
if (length > counts_.size()) {
counts_.resize(length);
}
counts_[length - 1] = fast_counter_;
}
void ARPAOutput::Finish() {
try {
file_ << "\\end\\\n";
file_.seekp(0);
WriteCounts(file_, counts_);
file_ << std::flush;
} catch (const std::ios_base::failure &f) {
throw ARPAOutputException("Finishing including writing counts at beginning to ", file_name_);
}
}
} // namespace lm
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