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// Step of trie builder: create sorted files.
#ifndef LM_TRIE_SORT_H
#define LM_TRIE_SORT_H
#include "max_order.hh"
#include "word_index.hh"
#include "../util/file.hh"
#include "../util/scoped.hh"
#include <cstddef>
#include <functional>
#include <string>
#include <vector>
#include <stdint.h>
namespace util {
class FilePiece;
} // namespace util
namespace lm {
class PositiveProbWarn;
namespace ngram {
class SortedVocabulary;
struct Config;
namespace trie {
class EntryCompare : public std::binary_function<const void*, const void*, bool> {
public:
explicit EntryCompare(unsigned char order) : order_(order) {}
bool operator()(const void *first_void, const void *second_void) const {
const WordIndex *first = static_cast<const WordIndex*>(first_void);
const WordIndex *second = static_cast<const WordIndex*>(second_void);
const WordIndex *end = first + order_;
for (; first != end; ++first, ++second) {
if (*first < *second) return true;
if (*first > *second) return false;
}
return false;
}
private:
unsigned char order_;
};
class RecordReader {
public:
RecordReader() : remains_(true) {}
void Init(FILE *file, std::size_t entry_size);
void *Data() { return data_.get(); }
const void *Data() const { return data_.get(); }
RecordReader &operator++() {
std::size_t ret = fread(data_.get(), entry_size_, 1, file_);
if (!ret) {
UTIL_THROW_IF(!feof(file_), util::ErrnoException, "Error reading temporary file");
remains_ = false;
}
return *this;
}
operator bool() const { return remains_; }
void Rewind();
std::size_t EntrySize() const { return entry_size_; }
void Overwrite(const void *start, std::size_t amount);
private:
FILE *file_;
util::scoped_malloc data_;
bool remains_;
std::size_t entry_size_;
};
class SortedFiles {
public:
// Build from ARPA
SortedFiles(const Config &config, util::FilePiece &f, std::vector<uint64_t> &counts, std::size_t buffer, const std::string &file_prefix, SortedVocabulary &vocab);
int StealUnigram() {
return unigram_.release();
}
FILE *Full(unsigned char order) {
return full_[order - 2].get();
}
FILE *Context(unsigned char of_order) {
return context_[of_order - 2].get();
}
private:
void ConvertToSorted(util::FilePiece &f, const SortedVocabulary &vocab, const std::vector<uint64_t> &counts, const std::string &prefix, unsigned char order, PositiveProbWarn &warn, void *mem, std::size_t mem_size);
util::scoped_fd unigram_;
util::scoped_FILE full_[KENLM_MAX_ORDER - 1], context_[KENLM_MAX_ORDER - 1];
};
} // namespace trie
} // namespace ngram
} // namespace lm
#endif // LM_TRIE_SORT_H
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