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#include "antlr/TokenStreamBasicFilter.h"
ANTLR_BEGIN_NAMESPACE(antlr)
/** 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;
}
ANTLR_END_NAMESPACE
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