src/antlr/TokenStreamBasicFilter.cpp

/* ANTLR Translator Generator
 * Project led by Terence Parr at http://www.jGuru.com
 * Software rights: http://www.antlr.org/license.html
 *
 * $Id: TokenStreamBasicFilter.cpp,v 1.1 2005-12-02 15:38:02 tim Exp $
 */
#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

Revision:	2469
Committed:	Fri Dec 2 15:38:03 2005 UTC (18 years, 7 months ago) by tim
File size:	965 byte(s)
Log Message:	End of the Link --> List Return of the Oject-Oriented replace yacc/lex parser with antlr parser
#	Content
1	/* ANTLR Translator Generator
2	* Project led by Terence Parr at http://www.jGuru.com
3	* Software rights: http://www.antlr.org/license.html
4	*
5	* $Id: TokenStreamBasicFilter.cpp,v 1.1 2005-12-02 15:38:02 tim Exp $
6	*/
7	#include "antlr/TokenStreamBasicFilter.hpp"
8
9	#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
10	namespace antlr {
11	#endif
12
13	/** This object is a TokenStream that passes through all
14	* tokens except for those that you tell it to discard.
15	* There is no buffering of the tokens.
16	*/
17	TokenStreamBasicFilter::TokenStreamBasicFilter(TokenStream& input_)
18	: input(&input_)
19	{
20	}
21
22	void TokenStreamBasicFilter::discard(int ttype)
23	{
24	discardMask.add(ttype);
25	}
26
27	void TokenStreamBasicFilter::discard(const BitSet& mask)
28	{
29	discardMask = mask;
30	}
31
32	RefToken TokenStreamBasicFilter::nextToken()
33	{
34	RefToken tok = input->nextToken();
35	while ( tok && discardMask.member(tok->getType()) ) {
36	tok = input->nextToken();
37	}
38	return tok;
39	}
40
41	#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
42	}
43	#endif
44