mirror of
https://github.com/moses-smt/mosesdecoder.git
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91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
/***********************************************************************
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Moses - statistical machine translation system
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Copyright (C) 2006-2012 University of Edinburgh
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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***********************************************************************/
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#include "xml_tree_parser.h"
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#include "exception.h"
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#include "tables-core.h"
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#include "XmlException.h"
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#include "XmlTree.h"
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#include <cassert>
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#include <vector>
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using namespace MosesTraining;
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namespace Moses {
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namespace PCFG {
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XmlTreeParser::XmlTreeParser()
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{
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}
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std::auto_ptr<PcfgTree> XmlTreeParser::Parse(const std::string &line)
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{
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m_line = line;
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m_tree.Clear();
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try {
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if (!ProcessAndStripXMLTags(m_line, m_tree, m_labelSet, m_topLabelSet)) {
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throw Exception("");
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}
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} catch (const XmlException &e) {
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throw Exception(e.getMsg());
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}
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m_tree.ConnectNodes();
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SyntaxNode *root = m_tree.GetTop();
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if (!root) {
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// There is no XML tree.
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return std::auto_ptr<PcfgTree>();
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}
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m_words = tokenize(m_line.c_str());
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return ConvertTree(*root, m_words);
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}
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// Converts a SyntaxNode tree to a Moses::PCFG::PcfgTree.
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std::auto_ptr<PcfgTree> XmlTreeParser::ConvertTree(
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const SyntaxNode &tree,
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const std::vector<std::string> &words)
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{
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std::auto_ptr<PcfgTree> root(new PcfgTree(tree.GetLabel()));
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const std::vector<SyntaxNode*> &children = tree.GetChildren();
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if (children.empty()) {
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if (tree.GetStart() != tree.GetEnd()) {
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std::ostringstream msg;
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msg << "leaf node covers multiple words (" << tree.GetStart()
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<< "-" << tree.GetEnd() << "): this is currently unsupported";
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throw Exception(msg.str());
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}
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std::auto_ptr<PcfgTree> leaf(new PcfgTree(words[tree.GetStart()]));
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leaf->set_parent(root.get());
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root->AddChild(leaf.release());
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} else {
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for (std::vector<SyntaxNode*>::const_iterator p = children.begin();
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p != children.end(); ++p) {
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assert(*p);
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std::auto_ptr<PcfgTree> child = ConvertTree(**p, words);
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child->set_parent(root.get());
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root->AddChild(child.release());
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}
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}
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return root;
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}
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} // namespace PCFG
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} // namespace Moses
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