// Converts a SyntaxNode tree to a Moses::GHKM::ParseTree.
std::auto_ptr<ParseTree> XmlTreeParser::ConvertTree(
const SyntaxNode &tree,
const std::vector<std::string> &words)
{
std::auto_ptr<ParseTree> root(new ParseTree(tree.GetLabel()));
const std::vector<SyntaxNode*> &children = tree.GetChildren();
if (children.empty()) {
if (tree.GetStart() != tree.GetEnd()) {
std::ostringstream msg;
msg << "leaf node covers multiple words (" << tree.GetStart()
<< "-" << tree.GetEnd() << "): this is currently unsupported";
throw Exception(msg.str());
}
std::auto_ptr<ParseTree> leaf(new ParseTree(words[tree.GetStart()]));
leaf->SetParent(root.get());
root->AddChild(leaf.release());
} else {
for (std::vector<SyntaxNode*>::const_iterator p = children.begin();
p != children.end(); ++p) {
assert(*p);
std::auto_ptr<ParseTree> child = ConvertTree(**p, words);
child->SetParent(root.get());
root->AddChild(child.release());
}
}
return root;
}
