DiagnosticErrorListener

This implementation of {@link ANTLRErrorListener} can be used to identify certain potential correctness and performance problems in grammars. "Reports" are made by calling {@link Parser#notifyErrorListeners} with the appropriate message.

<ul> <li>Ambiguities: These are cases where more than one path through the grammar can match the input.</li> <li>Weak context sensitivity: These are cases where full-context prediction resolved an SLL conflict to a unique alternative which equaled the minimum alternative of the SLL conflict.</li> <li>Strong (forced) context sensitivity: These are cases where the full-context prediction resolved an SLL conflict to a unique alternative, and the minimum alternative of the SLL conflict was found to not be a truly viable alternative. Two-stage parsing cannot be used for inputs where this situation occurs.</li> </ul>

@author Sam Harwell

class DiagnosticErrorListener : BaseErrorListener!(U, V)(

) {

protected

bool exactOnly;

this();

this(bool exactOnly);

void reportAmbiguity(InterfaceParser recognizer, DFA dfa, size_t startIndex, size_t stopIndex, bool exact, BitSet ambigAlts, ATNConfigSet configs);

void reportAttemptingFullContext(InterfaceParser recognizer, DFA dfa, size_t startIndex, size_t stopIndex, BitSet conflictingAlts, ATNConfigSet configs);

void reportContextSensitivity(InterfaceParser recognizer, DFA dfa, size_t startIndex, size_t stopIndex, int prediction, ATNConfigSet configs);

string getDecisionDescription(InterfaceParser recognizer, DFA dfa);

BitSet getConflictingAlts(BitSet reportedAlts, ATNConfigSet configs);

}

Constructors

this this(): Initializes a new instance of {@link DiagnosticErrorListener} which only reports exact ambiguities.
this this(bool exactOnly): Initializes a new instance of {@link DiagnosticErrorListener}, specifying whether all ambiguities or only exact ambiguities are reported.

Members

Functions

getConflictingAlts BitSet getConflictingAlts(BitSet reportedAlts, ATNConfigSet configs): Computes the set of conflicting or ambiguous alternatives from a configuration set, if that information was not already provided by the parser.
getDecisionDescription string getDecisionDescription(InterfaceParser recognizer, DFA dfa): Undocumented in source. Be warned that the author may not have intended to support it.
reportAmbiguity void reportAmbiguity(InterfaceParser recognizer, DFA dfa, size_t startIndex, size_t stopIndex, bool exact, BitSet ambigAlts, ATNConfigSet configs): @uml @override
reportAttemptingFullContext void reportAttemptingFullContext(InterfaceParser recognizer, DFA dfa, size_t startIndex, size_t stopIndex, BitSet conflictingAlts, ATNConfigSet configs): @uml @override
reportContextSensitivity void reportContextSensitivity(InterfaceParser recognizer, DFA dfa, size_t startIndex, size_t stopIndex, int prediction, ATNConfigSet configs): @uml @override

Variables

exactOnly bool exactOnly;: When {@code true}, only exactly known ambiguities are reported.

DiagnosticErrorListener

Constructors

Members

Functions

Variables

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