TokenStreamHiddenTokenFilter Class Reference

#include <TokenStreamHiddenTokenFilter.hpp>

Inheritance diagram for TokenStreamHiddenTokenFilter:

Collaboration diagram for TokenStreamHiddenTokenFilter:


Public Member Functions
	TokenStreamHiddenTokenFilter (TokenStream &input)
BitSet	getDiscardMask () const
RefToken	getHiddenAfter (RefToken t)
RefToken	getHiddenBefore (RefToken t)
BitSet	getHideMask () const
RefToken	getInitialHiddenToken ()
void	hide (int m)
void	hide (const BitSet &mask)
RefToken	nextToken ()
Protected Member Functions
void	consume ()
RefToken	LA (int i)
Protected Attributes
BitSet	hideMask
RefToken	lastHiddenToken
RefToken	firstHidden
Private Member Functions
void	consumeFirst ()
Private Attributes
RefToken	nextMonitoredToken

Detailed Description

This object filters a token stream coming from a lexer or another TokenStream so that only certain token channels get transmitted to the parser.

Any of the channels can be filtered off as "hidden" channels whose tokens can be accessed from the parser.

Definition at line 25 of file TokenStreamHiddenTokenFilter.hpp.

Constructor & Destructor Documentation

TokenStreamHiddenTokenFilter::TokenStreamHiddenTokenFilter ( TokenStream & input )

Member Function Documentation

void TokenStreamHiddenTokenFilter::consume ( ) [protected]

void TokenStreamHiddenTokenFilter::consumeFirst ( ) [private]

BitSet TokenStreamHiddenTokenFilter::getDiscardMask ( ) const

RefToken TokenStreamHiddenTokenFilter::getHiddenAfter ( RefToken t )

Return a ptr to the hidden token appearing immediately after token t in the input stream.

RefToken TokenStreamHiddenTokenFilter::getHiddenBefore ( RefToken t )

Return a ptr to the hidden token appearing immediately before token t in the input stream.

BitSet TokenStreamHiddenTokenFilter::getHideMask ( ) const

RefToken TokenStreamHiddenTokenFilter::getInitialHiddenToken ( )

Return the first hidden token if one appears before any monitored token.

void TokenStreamHiddenTokenFilter::hide ( int m )

void TokenStreamHiddenTokenFilter::hide ( const BitSet & mask )

RefToken TokenStreamHiddenTokenFilter::LA ( int i ) [protected]

RefToken TokenStreamHiddenTokenFilter::nextToken ( ) [virtual]

Return the next monitored token. Test the token following the monitored token. If following is another monitored token, save it for the next invocation of nextToken (like a single lookahead token) and return it then. If following is unmonitored, nondiscarded (hidden) channel token, add it to the monitored token.

Note: EOF must be a monitored Token.

Reimplemented from TokenStreamBasicFilter.