org.antlr.v4.runtime.NoViableAltException Maven / Gradle / Ivy
/*
* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD 3-clause license that
* can be found in the LICENSE.txt file in the project root.
*/
package org.antlr.v4.runtime;
import org.antlr.v4.runtime.atn.ATNConfigSet;
/** Indicates that the parser could not decide which of two or more paths
* to take based upon the remaining input. It tracks the starting token
* of the offending input and also knows where the parser was
* in the various paths when the error. Reported by reportNoViableAlternative()
*/
public class NoViableAltException extends RecognitionException {
/** Which configurations did we try at input.index() that couldn't match input.LT(1)? */
private final ATNConfigSet deadEndConfigs;
/** The token object at the start index; the input stream might
* not be buffering tokens so get a reference to it. (At the
* time the error occurred, of course the stream needs to keep a
* buffer all of the tokens but later we might not have access to those.)
*/
private final Token startToken;
public NoViableAltException(Parser recognizer) { // LL(1) error
this(recognizer,
recognizer.getInputStream(),
recognizer.getCurrentToken(),
recognizer.getCurrentToken(),
null,
recognizer._ctx);
}
public NoViableAltException(Parser recognizer,
TokenStream input,
Token startToken,
Token offendingToken,
ATNConfigSet deadEndConfigs,
ParserRuleContext ctx)
{
super(recognizer, input, ctx);
this.deadEndConfigs = deadEndConfigs;
this.startToken = startToken;
this.setOffendingToken(offendingToken);
}
public Token getStartToken() {
return startToken;
}
public ATNConfigSet getDeadEndConfigs() {
return deadEndConfigs;
}
}