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/***********************************************************************
Moses - statistical machine translation system
Copyright (C) 2006-2012 University of Edinburgh
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
***********************************************************************/
#include "rule_extractor.h"
namespace MosesTraining
{
namespace Syntax
{
namespace PCFG
{
RuleExtractor::RuleExtractor(Vocabulary &non_term_vocab)
: non_term_vocab_(non_term_vocab)
{
}
void RuleExtractor::Extract(const SyntaxTree &tree, RuleCollection &rc) const
{
if (tree.IsLeaf() || tree.children()[0]->IsLeaf()) {
return;
}
std::size_t lhs = non_term_vocab_.Insert(tree.value().label);
std::vector<std::size_t> rhs;
const std::vector<SyntaxTree *> &children = tree.children();
rhs.reserve(children.size());
for (std::vector<SyntaxTree *>::const_iterator p(children.begin());
p != children.end(); ++p) {
const SyntaxTree &child = **p;
rhs.push_back(non_term_vocab_.Insert(child.value().label));
Extract(child, rc);
}
rc.Add(lhs, rhs);
}
} // namespace PCFG
} // namespace Syntax
} // namespace MosesTraining
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