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#include "antlr/BitSet.h"
#include <string>
ANTLR_BEGIN_NAMESPACE(antlr)
/** A BitSet to replace java.util.BitSet.
* Primary differences are that most set operators return new sets
* as opposed to oring and anding "in place". Further, a number of
* operations were added. I cannot contain a BitSet because there
* is no way to access the internal bits (which I need for speed)
* and, because it is final, I cannot subclass to add functionality.
* Consider defining set degree. Without access to the bits, I must
* call a method n times to test the ith bit...ack!
*
* Also seems like or() from util is wrong when size of incoming set is bigger
* than this.length.
*
* This is a C++ version of the Java class described above, with only
* a handful of the methods implemented, because we don't need the
* others at runtime. It's really just a wrapper around vector<bool>,
* which should probably be changed to a wrapper around bitset, once
* bitset is more widely available.
*
* @author Terence Parr, MageLang Institute
* @author <br><a href="mailto:[email protected]">Pete Wells</a>
*/
BitSet::BitSet(int nbits)
: storage(nbits)
{
for (int i=0;i<nbits;i++) {
storage[i] = false;
}
}
BitSet::BitSet(const unsigned long* bits_,int nlongs)
: storage(nlongs*32)
{
for ( int i = 0 ; i < nlongs*32; i++) {
storage[i] = (bits_[i>>5] & (1UL << (i&31))) ? true : false;
}
}
BitSet::~BitSet()
{
}
void BitSet::add(int el)
{
if ( el < 0 )
throw ANTLR_USE_NAMESPACE(std)out_of_range(ANTLR_USE_NAMESPACE(std)string("antlr::BitSet.cpp line 49"));
if( static_cast<unsigned int>(el) >= storage.size() )
storage.resize( el+1, false );
storage[el] = true;
}
bool BitSet::member(int el) const
{
if ( el < 0 || static_cast<unsigned int>(el) >= storage.size())
return false;
return storage[el];
}
ANTLR_USE_NAMESPACE(std)vector<int> BitSet::toArray() const
{
ANTLR_USE_NAMESPACE(std)vector<int> elems;
for (unsigned int i=0;i<storage.size();i++) {
if (storage[i])
elems.push_back(i);
}
return elems;
}
ANTLR_END_NAMESPACE
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