org.antlr.v4.runtime

Class ProxyErrorListener<Symbol>

java.lang.Object

org.antlr.v4.runtime.ProxyErrorListener<Symbol>

All Implemented Interfaces:

ANTLRErrorListener<Symbol>

Direct Known Subclasses:

ProxyParserErrorListener

public class ProxyErrorListener<Symbol>
extends Object
implements ANTLRErrorListener<Symbol>

This implementation of ANTLRErrorListener dispatches all calls to a collection of delegate listeners. This reduces the effort required to support multiple listeners.

Author:

Sam Harwell

Constructor Summary

Constructors

Constructor and Description
ProxyErrorListener(Collection<? extends ANTLRErrorListener<? super Symbol>> delegates)

Method Summary

Modifier and Type	Method and Description
protected Collection<? extends ANTLRErrorListener<? super Symbol>>	getDelegates()
<T extends Symbol> void	syntaxError(Recognizer<T,?> recognizer, T offendingSymbol, int line, int charPositionInLine, String msg, RecognitionException e) Upon syntax error, notify any interested parties.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ProxyErrorListener

public ProxyErrorListener(Collection<? extends ANTLRErrorListener<? super Symbol>> delegates)

Method Detail

getDelegates

protected Collection<? extends ANTLRErrorListener<? super Symbol>> getDelegates()

syntaxError

public <T extends Symbol> void syntaxError(@NotNull
                                           Recognizer<T,?> recognizer,
                                           @Nullable
                                           T offendingSymbol,
                                           int line,
                                           int charPositionInLine,
                                           @NotNull
                                           String msg,
                                           @Nullable
                                           RecognitionException e)

Description copied from interface: ANTLRErrorListener

Upon syntax error, notify any interested parties. This is not how to recover from errors or compute error messages. ANTLRErrorStrategy specifies how to recover from syntax errors and how to compute error messages. This listener's job is simply to emit a computed message, though it has enough information to create its own message in many cases.

The RecognitionException is non-null for all syntax errors except when we discover mismatched token errors that we can recover from in-line, without returning from the surrounding rule (via the single token insertion and deletion mechanism).

Specified by:

syntaxError in interface ANTLRErrorListener<Symbol>

Parameters:

recognizer - What parser got the error. From this object, you can access the context as well as the input stream.

offendingSymbol - The offending token in the input token stream, unless recognizer is a lexer (then it's null). If no viable alternative error, e has token at which we started production for the decision.

line - The line number in the input where the error occurred.

charPositionInLine - The character position within that line where the error occurred.

msg - The message to emit.

e - The exception generated by the parser that led to the reporting of an error. It is null in the case where the parser was able to recover in line without exiting the surrounding rule.