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/*
* [The "BSD license"]
* Copyright (c) 2012 Terence Parr
* Copyright (c) 2012 Sam Harwell
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.antlr.v4.runtime;
import org.antlr.v4.runtime.atn.ATNConfigSet;
import org.antlr.v4.runtime.misc.NotNull;
import org.antlr.v4.runtime.misc.Nullable;
/** 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)? */
@Nullable
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.)
*/
@NotNull
private final Token startToken;
public NoViableAltException(@NotNull Parser recognizer) { // LL(1) error
this(recognizer,
recognizer.getInputStream(),
recognizer.getCurrentToken(),
recognizer.getCurrentToken(),
null,
recognizer._ctx);
}
public NoViableAltException(@NotNull Parser recognizer,
@NotNull TokenStream input,
@NotNull Token startToken,
@NotNull Token offendingToken,
@Nullable ATNConfigSet deadEndConfigs,
@NotNull ParserRuleContext ctx)
{
super(recognizer, input, ctx);
this.deadEndConfigs = deadEndConfigs;
this.startToken = startToken;
this.setOffendingToken(offendingToken);
}
@NotNull
public Token getStartToken() {
return startToken;
}
@Nullable
public ATNConfigSet getDeadEndConfigs() {
return deadEndConfigs;
}
}
