ParentNodes determineSplitPoints(const SyntaxNodeCollection &nodeColl)
{
ParentNodes parents;
const std::size_t numWords = nodeColl.GetNumWords();
// looping through all spans of size >= 2
for( int length=2; length<=numWords; length++ ) {
for( int startPos = 0; startPos <= numWords-length; startPos++ ) {
if (nodeColl.HasNode( startPos, startPos+length-1 )) {
// processing one (parent) span
//std::cerr << "# " << startPos << "-" << (startPos+length-1) << ":";
SplitPoints splitPoints;
splitPoints.push_back( startPos );
//std::cerr << " " << startPos;
int first = 1;
int covered = 0;
int found_somehing = 1; // break loop if nothing found
while( covered < length && found_somehing ) {
// find largest covering subspan (child)
// starting at last covered position
found_somehing = 0;
for( int midPos=length-first; midPos>covered; midPos-- ) {
if( nodeColl.HasNode( startPos+covered, startPos+midPos-1 ) ) {
covered = midPos;
splitPoints.push_back( startPos+covered );
// std::cerr << " " << ( startPos+covered );
first = 0;
found_somehing = 1;
}
}
}
// std::cerr << std::endl;
parents.push_back( splitPoints );
}
}
}
return parents;
}
ParentNodes SyntaxTree::Parse()
{
ParentNodes parents;
int size = m_index.size();
// looping through all spans of size >= 2
for( int length=2; length<=size; length++ ) {
for( int startPos = 0; startPos <= size-length; startPos++ ) {
if (HasNode( startPos, startPos+length-1 )) {
// processing one (parent) span
//std::cerr << "# " << startPos << "-" << (startPos+length-1) << ":";
SplitPoints splitPoints;
splitPoints.push_back( startPos );
//std::cerr << " " << startPos;
int first = 1;
int covered = 0;
while( covered < length ) {
// find largest covering subspan (child)
// starting at last covered position
for( int midPos=length-first; midPos>covered; midPos-- ) {
if( HasNode( startPos+covered, startPos+midPos-1 ) ) {
covered = midPos;
splitPoints.push_back( startPos+covered );
// std::cerr << " " << ( startPos+covered );
first = 0;
}
}
}
// std::cerr << std::endl;
parents.push_back( splitPoints );
}
}
}
return parents;
}
