org.antlr.runtime
Class Parser
java.lang.Object
org.antlr.runtime.BaseRecognizer
org.antlr.runtime.Parser
- Direct Known Subclasses:
- ANTLRv3Parser, DebugParser
public class Parser
- extends BaseRecognizer
A parser for TokenStreams. "parser grammars" result in a subclass
of this.
Methods inherited from class org.antlr.runtime.BaseRecognizer |
alreadyParsedRule, beginResync, combineFollows, computeContextSensitiveRuleFOLLOW, computeErrorRecoverySet, consumeUntil, consumeUntil, displayRecognitionError, emitErrorMessage, endResync, failed, getBacktrackingLevel, getErrorHeader, getErrorMessage, getGrammarFileName, getNumberOfSyntaxErrors, getRuleInvocationStack, getRuleInvocationStack, getRuleMemoization, getRuleMemoizationCacheSize, getTokenErrorDisplay, getTokenNames, match, matchAny, memoize, mismatchIsMissingToken, mismatchIsUnwantedToken, pushFollow, recover, recoverFromMismatchedSet, recoverFromMismatchedToken, reportError, setBacktrackingLevel, toStrings, traceIn, traceOut |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
input
public TokenStream input
Parser
public Parser(TokenStream input)
Parser
public Parser(TokenStream input,
RecognizerSharedState state)
reset
public void reset()
- Description copied from class:
BaseRecognizer
- reset the parser's state; subclasses must rewinds the input stream
- Overrides:
reset
in class BaseRecognizer
getCurrentInputSymbol
protected java.lang.Object getCurrentInputSymbol(IntStream input)
- Description copied from class:
BaseRecognizer
- Match needs to return the current input symbol, which gets put
into the label for the associated token ref; e.g., x=ID. Token
and tree parsers need to return different objects. Rather than test
for input stream type or change the IntStream interface, I use
a simple method to ask the recognizer to tell me what the current
input symbol is.
This is ignored for lexers.
- Overrides:
getCurrentInputSymbol
in class BaseRecognizer
getMissingSymbol
protected java.lang.Object getMissingSymbol(IntStream input,
RecognitionException e,
int expectedTokenType,
BitSet follow)
- Description copied from class:
BaseRecognizer
- Conjure up a missing token during error recovery.
The recognizer attempts to recover from single missing
symbols. But, actions might refer to that missing symbol.
For example, x=ID {f($x);}. The action clearly assumes
that there has been an identifier matched previously and that
$x points at that token. If that token is missing, but
the next token in the stream is what we want we assume that
this token is missing and we keep going. Because we
have to return some token to replace the missing token,
we have to conjure one up. This method gives the user control
over the tokens returned for missing tokens. Mostly,
you will want to create something special for identifier
tokens. For literals such as '{' and ',', the default
action in the parser or tree parser works. It simply creates
a CommonToken of the appropriate type. The text will be the token.
If you change what tokens must be created by the lexer,
override this method to create the appropriate tokens.
- Overrides:
getMissingSymbol
in class BaseRecognizer
setTokenStream
public void setTokenStream(TokenStream input)
- Set the token stream and reset the parser
getTokenStream
public TokenStream getTokenStream()
getSourceName
public java.lang.String getSourceName()
- Specified by:
getSourceName
in class BaseRecognizer
traceIn
public void traceIn(java.lang.String ruleName,
int ruleIndex)
traceOut
public void traceOut(java.lang.String ruleName,
int ruleIndex)
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