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#include "pcfg.h"
#include <cassert>
#include <boost/algorithm/string.hpp>
#include <boost/lexical_cast.hpp>
#include "syntax-common/exception.h"
namespace MosesTraining {
namespace Syntax {
void Pcfg::Add(const Key &key, double score) {
rules_[key] = score;
}
bool Pcfg::Lookup(const Key &key, double &score) const {
Map::const_iterator p = rules_.find(key);
if (p == rules_.end()) {
return false;
}
score = p->second;
return true;
}
void Pcfg::Read(std::istream &input, Vocabulary &vocab) {
std::string line;
std::string lhs_string;
std::vector<std::string> rhs_strings;
std::string score_string;
Key key;
while (std::getline(input, line)) {
// Read LHS.
std::size_t pos = line.find("|||");
if (pos == std::string::npos) {
throw Exception("missing first delimiter");
}
lhs_string = line.substr(0, pos);
boost::trim(lhs_string);
// Read RHS.
std::size_t begin = pos+3;
pos = line.find("|||", begin);
if (pos == std::string::npos) {
throw Exception("missing second delimiter");
}
std::string rhs_text = line.substr(begin, pos-begin);
boost::trim(rhs_text);
rhs_strings.clear();
boost::split(rhs_strings, rhs_text, boost::algorithm::is_space(),
boost::algorithm::token_compress_on);
// Read score.
score_string = line.substr(pos+3);
boost::trim(score_string);
// Construct key.
key.clear();
key.reserve(rhs_strings.size()+1);
key.push_back(vocab.Insert(lhs_string));
for (std::vector<std::string>::const_iterator p = rhs_strings.begin();
p != rhs_strings.end(); ++p) {
key.push_back(vocab.Insert(*p));
}
// Add rule.
double score = boost::lexical_cast<double>(score_string);
Add(key, score);
}
}
void Pcfg::Write(const Vocabulary &vocab, std::ostream &output) const {
for (const_iterator p = begin(); p != end(); ++p) {
const Key &key = p->first;
double score = p->second;
std::vector<std::size_t>::const_iterator q = key.begin();
std::vector<std::size_t>::const_iterator end = key.end();
output << vocab.Lookup(*q++) << " |||";
while (q != end) {
output << " " << vocab.Lookup(*q++);
}
output << " ||| " << score << std::endl;
}
}
} // namespace Syntax
} // namespace MosesTraining
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