DefaultErrorStrategy class - antlr4 library

Constructors

DefaultErrorStrategy()

Properties

errorRecoveryMode ↔ bool: Indicates whether the error strategy is currently "recovering from an error". This is used to suppress reporting multiple error messages while attempting to recover from a detected syntax error.
getter/setter pair
hashCode → int: The hash code for this object.
no setterinherited
lastErrorIndex ↔ int: The index into the input stream where the last error occurred. This is used to prevent infinite loops where an error is found but no token is consumed during recovery...another error is found, ad nauseum. This is a failsafe mechanism to guarantee that at least one token/tree node is consumed for two errors.
getter/setter pair
lastErrorStates ↔ IntervalSet?: getter/setter pair
nextTokensContext ↔ ParserRuleContext?: This field is used to propagate information about the lookahead following the previous match. Since prediction prefers completing the current rule to error recovery efforts, error reporting may occur later than the original point where it was discoverable. The original context is used to compute the true expected sets as though the reporting occurred as early as possible.
getter/setter pair
nextTokensState ↔ int?: @see #nextTokensContext
getter/setter pair
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

Methods

beginErrorCondition(Parser recognizer) → void: This method is called to enter error recovery mode when a recognition exception is reported.
consumeUntil(Parser recognizer, IntervalSet set) → void: Consume tokens until one matches the given token set. */
endErrorCondition(Parser recognizer) → void: This method is called to leave error recovery mode after recovering from a recognition exception.
escapeWSAndQuote(String s) → String
getErrorRecoverySet(Parser recognizer) → IntervalSet
getExpectedTokens(Parser recognizer) → IntervalSet
getMissingSymbol(Parser recognizer) → Token: Conjure up a missing token during error recovery.
getSymbolText(Token symbol) → String?
getSymbolType(Token symbol) → int
getTokenErrorDisplay(Token? t) → String: How should a token be displayed in an error message? The default is to display just the text, but during development you might want to have a lot of information spit out. Override in that case to use t.toString() (which, for CommonToken, dumps everything about the token). This is better than forcing you to override a method in your token objects because you don't have to go modify your lexer so that it creates a new Java type.
inErrorRecoveryMode(Parser recognizer) → bool: {@inheritDoc}
override
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
recover(Parser recognizer, RecognitionException<IntStream> e) → void: {@inheritDoc}
override
recoverInline(Parser recognizer) → Token: {@inheritDoc}
override
reportError(Parser recognizer, RecognitionException<IntStream> e) → void: {@inheritDoc}
override
reportFailedPredicate(Parser recognizer, FailedPredicateException e) → void: This is called by {@link #reportError} when the exception is a FailedPredicateException.
reportInputMismatch(Parser recognizer, InputMismatchException e) → void: This is called by {@link #reportError} when the exception is an InputMismatchException.
reportMatch(Parser recognizer) → void: {@inheritDoc}
override
reportMissingToken(Parser recognizer) → void: This method is called to report a syntax error which requires the insertion of a missing token into the input stream. At the time this method is called, the missing token has not yet been inserted. When this method returns, recognizer is in error recovery mode.
reportNoViableAlternative(Parser recognizer, NoViableAltException e) → void: This is called by {@link #reportError} when the exception is a NoViableAltException.
reportUnwantedToken(Parser recognizer) → void: This method is called to report a syntax error which requires the removal of a token from the input stream. At the time this method is called, the erroneous symbol is current {@code LT(1)} symbol and has not yet been removed from the input stream. When this method returns, recognizer is in error recovery mode.
reset(Parser recognizer) → void: {@inheritDoc}
override
singleTokenDeletion(Parser recognizer) → Token?: This method implements the single-token deletion inline error recovery strategy. It is called by {@link #recoverInline} to attempt to recover from mismatched input. If this method returns null, the parser and error handler state will not have changed. If this method returns non-null, recognizer will not be in error recovery mode since the returned token was a successful match.
singleTokenInsertion(Parser recognizer) → bool: This method implements the single-token insertion inline error recovery strategy. It is called by {@link #recoverInline} if the single-token deletion strategy fails to recover from the mismatched input. If this method returns true, recognizer will be in error recovery mode.
sync(Parser recognizer) → void: The default implementation of {@link ANTLRErrorStrategy#sync} makes sure that the current lookahead symbol is consistent with what were expecting at this point in the ATN. You can call this anytime but ANTLR only generates code to check before subrules/loops and each iteration.
override
toString() → String: A string representation of this object.
inherited

Operators

operator ==(Object other) → bool: The equality operator.
inherited