#include <TokenStreamHiddenTokenFilter.hpp>
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 |
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.
antlr::TokenStreamHiddenTokenFilter::TokenStreamHiddenTokenFilter | ( | TokenStream & | input | ) |
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.
void antlr::TokenStreamHiddenTokenFilter::consume | ( | ) | [protected] |
void antlr::TokenStreamHiddenTokenFilter::consumeFirst | ( | ) | [private] |
BitSet antlr::TokenStreamHiddenTokenFilter::getDiscardMask | ( | ) | const |
Return a ptr to the hidden token appearing immediately after token t in the input stream.
Return a ptr to the hidden token appearing immediately before token t in the input stream.
BitSet antlr::TokenStreamHiddenTokenFilter::getHideMask | ( | ) | const |
RefToken antlr::TokenStreamHiddenTokenFilter::getInitialHiddenToken | ( | ) |
Return the first hidden token if one appears before any monitored token.
void antlr::TokenStreamHiddenTokenFilter::hide | ( | const BitSet & | mask | ) |
void antlr::TokenStreamHiddenTokenFilter::hide | ( | int | m | ) |
RefToken antlr::TokenStreamHiddenTokenFilter::LA | ( | int | i | ) | [protected] |
RefToken antlr::TokenStreamHiddenTokenFilter::nextToken | ( | void | ) | [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 antlr::TokenStreamBasicFilter.
BitSet antlr::TokenStreamHiddenTokenFilter::hideMask [protected] |
track tail of hidden list emanating from previous monitored token