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/* ANTLR Translator Generator
* Project led by Terence Parr at http://www.jGuru.com
* Software rights: http://www.antlr.org/license.html
*
* $Id$
*/
#include "antlr/TokenStreamBasicFilter.hpp"
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif
/** This object is a TokenStream that passes through all
* tokens except for those that you tell it to discard.
* There is no buffering of the tokens.
*/
TokenStreamBasicFilter::TokenStreamBasicFilter(TokenStream& input_)
: input(&input_)
{
}
void TokenStreamBasicFilter::discard(int ttype)
{
discardMask.add(ttype);
}
void TokenStreamBasicFilter::discard(const BitSet& mask)
{
discardMask = mask;
}
RefToken TokenStreamBasicFilter::nextToken()
{
RefToken tok = input->nextToken();
while ( tok && discardMask.member(tok->getType()) ) {
tok = input->nextToken();
}
return tok;
}
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif
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