1#ifndef INC_TokenStreamBasicFilter_hpp__
2#define INC_TokenStreamBasicFilter_hpp__
3
4/* ANTLR Translator Generator
5 * Project led by Terence Parr at http://www.jGuru.com
6 * Software rights: http://www.antlr.org/license.html
7 *
8 * $Id: //depot/code/org.antlr/release/antlr-2.7.7/lib/cpp/antlr/TokenStreamBasicFilter.hpp#2 $
9 */
10
11#include <antlr/config.hpp>
12#include <antlr/BitSet.hpp>
13#include <antlr/TokenStream.hpp>
14
15#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
16namespace antlr {
17#endif
18
19/** This object is a TokenStream that passes through all
20 *  tokens except for those that you tell it to discard.
21 *  There is no buffering of the tokens.
22 */
23class ANTLR_API TokenStreamBasicFilter : public TokenStream {
24	/** The set of token types to discard */
25protected:
26	BitSet discardMask;
27
28	/** The input stream */
29protected:
30	TokenStream* input;
31
32public:
33	TokenStreamBasicFilter(TokenStream& input_);
34
35	void discard(int ttype);
36
37	void discard(const BitSet& mask);
38
39	RefToken nextToken();
40};
41
42#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
43}
44#endif
45
46#endif //INC_TokenStreamBasicFilter_hpp__
47