ErrorStrategy class abstract

The interface for defining strategies to deal with syntax errors encountered during a parse by ANTLR-generated parsers. We distinguish between three different kinds of errors:

  • The parser could not figure out which path to take in the ATN (none of the available alternatives could possibly match)
  • The current input does not match what we were looking for
  • A predicate evaluated to false

Implementations of this interface report syntax errors by calling {@link Parser#notifyErrorListeners}.

TODO: what to do about lexers

Implementers

Constructors

ErrorStrategy()

Properties

hashCode → int
The hash code for this object.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

inErrorRecoveryMode(Parser recognizer) → bool
Tests whether or not recognizer is in the process of recovering from an error. In error recovery mode, {@link Parser#consume} adds symbols to the parse tree by calling {@link Parser#createErrorNode(ParserRuleContext, Token)} then {@link ParserRuleContext#addErrorNode(ErrorNode)} instead of {@link Parser#createTerminalNode(ParserRuleContext, Token)}.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
recover(Parser recognizer, RecognitionException<IntStream> e) → void
This method is called to recover from exception e. This method is called after {@link #reportError} by the default exception handler generated for a rule method.
recoverInline(Parser recognizer) → Token
This method is called when an unexpected symbol is encountered during an inline match operation, such as {@link Parser#match}. If the error strategy successfully recovers from the match failure, this method returns the Token instance which should be treated as the successful result of the match.
reportError(Parser recognizer, RecognitionException<IntStream> e) → void
Report any kind of RecognitionException. This method is called by the default exception handler generated for a rule method.
reportMatch(Parser recognizer) → void
This method is called by when the parser successfully matches an input symbol.
reset(Parser recognizer) → void
Reset the error handler state for the specified recognizer. @param recognizer the parser instance
sync(Parser recognizer) → void
This method provides the error handler with an opportunity to handle syntactic or semantic errors in the input stream before they result in a RecognitionException.
toString() → String
A string representation of this object.
inherited

Operators

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