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#include "util/file_stream.hh"
#include "util/file_piece.hh"
#include "util/murmur_hash.hh"
#include "util/pool.hh"
#include "util/string_piece.hh"
#include "util/string_piece_hash.hh"
#include "util/tokenize_piece.hh"
#include <boost/unordered_map.hpp>
#include <boost/unordered_set.hpp>
#include <cstddef>
#include <vector>
namespace {
struct MutablePiece {
mutable StringPiece behind;
bool operator==(const MutablePiece &other) const {
return behind == other.behind;
}
};
std::size_t hash_value(const MutablePiece &m) {
return hash_value(m.behind);
}
class InternString {
public:
const char *Add(StringPiece str) {
MutablePiece mut;
mut.behind = str;
std::pair<boost::unordered_set<MutablePiece>::iterator, bool> res(strs_.insert(mut));
if (res.second) {
void *mem = backing_.Allocate(str.size() + 1);
memcpy(mem, str.data(), str.size());
static_cast<char*>(mem)[str.size()] = 0;
res.first->behind = StringPiece(static_cast<char*>(mem), str.size());
}
return res.first->behind.data();
}
private:
util::Pool backing_;
boost::unordered_set<MutablePiece> strs_;
};
class TargetWords {
public:
void Introduce(StringPiece source) {
vocab_.resize(vocab_.size() + 1);
std::vector<unsigned int> temp(1, vocab_.size() - 1);
Add(temp, source);
}
void Add(const std::vector<unsigned int> &sentences, StringPiece target) {
if (sentences.empty()) return;
interns_.clear();
for (util::TokenIter<util::SingleCharacter, true> i(target, ' '); i; ++i) {
interns_.push_back(intern_.Add(*i));
}
for (std::vector<unsigned int>::const_iterator i(sentences.begin()); i != sentences.end(); ++i) {
boost::unordered_set<const char *> &vocab = vocab_[*i];
for (std::vector<const char *>::const_iterator j = interns_.begin(); j != interns_.end(); ++j) {
vocab.insert(*j);
}
}
}
void Print() const {
util::FileStream out(1);
for (std::vector<boost::unordered_set<const char *> >::const_iterator i = vocab_.begin(); i != vocab_.end(); ++i) {
for (boost::unordered_set<const char *>::const_iterator j = i->begin(); j != i->end(); ++j) {
out << *j << ' ';
}
out << '\n';
}
}
private:
InternString intern_;
std::vector<boost::unordered_set<const char *> > vocab_;
// Temporary in Add.
std::vector<const char *> interns_;
};
class Input {
public:
explicit Input(std::size_t max_length)
: max_length_(max_length), sentence_id_(0), empty_() {}
void AddSentence(StringPiece sentence, TargetWords &targets) {
canonical_.clear();
starts_.clear();
starts_.push_back(0);
for (util::TokenIter<util::AnyCharacter, true> i(sentence, StringPiece("\0 \t", 3)); i; ++i) {
canonical_.append(i->data(), i->size());
canonical_ += ' ';
starts_.push_back(canonical_.size());
}
targets.Introduce(canonical_);
for (std::size_t i = 0; i < starts_.size() - 1; ++i) {
std::size_t subtract = starts_[i];
const char *start = &canonical_[subtract];
for (std::size_t j = i + 1; j < std::min(starts_.size(), i + max_length_ + 1); ++j) {
map_[util::MurmurHash64A(start, &canonical_[starts_[j]] - start - 1)].push_back(sentence_id_);
}
}
++sentence_id_;
}
// Assumes single space-delimited phrase with no space at the beginning or end.
const std::vector<unsigned int> &Matches(StringPiece phrase) const {
Map::const_iterator i = map_.find(util::MurmurHash64A(phrase.data(), phrase.size()));
return i == map_.end() ? empty_ : i->second;
}
private:
const std::size_t max_length_;
// hash of phrase is the key, array of sentences is the value.
typedef boost::unordered_map<uint64_t, std::vector<unsigned int> > Map;
Map map_;
std::size_t sentence_id_;
// Temporaries in AddSentence.
std::string canonical_;
std::vector<std::size_t> starts_;
const std::vector<unsigned int> empty_;
};
} // namespace
int main(int argc, char *argv[]) {
if (argc != 2) {
std::cerr << "Expected source text on the command line" << std::endl;
return 1;
}
Input input(7);
TargetWords targets;
try {
util::FilePiece inputs(argv[1], &std::cerr);
while (true)
input.AddSentence(inputs.ReadLine(), targets);
} catch (const util::EndOfFileException &e) {}
util::FilePiece table(0, NULL, &std::cerr);
StringPiece line;
const StringPiece pipes("|||");
while (true) {
try {
line = table.ReadLine();
} catch (const util::EndOfFileException &e) { break; }
util::TokenIter<util::MultiCharacter> it(line, pipes);
StringPiece source(*it);
if (!source.empty() && source[source.size() - 1] == ' ')
source.remove_suffix(1);
targets.Add(input.Matches(source), *++it);
}
targets.Print();
}
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