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/* 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.
*/
#pragma once
#include "RecognitionException.h"
#include "Token.h"
#include "atn/ATNConfigSet.h"
namespace antlr4 {
/// 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()
class ANTLR4CPP_PUBLIC NoViableAltException : public RecognitionException {
public:
NoViableAltException(Parser *recognizer); // LL(1) error
NoViableAltException(Parser *recognizer, TokenStream *input,Token *startToken,
Token *offendingToken, atn::ATNConfigSet *deadEndConfigs, ParserRuleContext *ctx, bool deleteConfigs);
~NoViableAltException();
virtual Token* getStartToken() const;
virtual atn::ATNConfigSet* getDeadEndConfigs() const;
private:
/// Which configurations did we try at input.index() that couldn't match input.LT(1)?
/// Shared pointer that conditionally deletes the configurations (based on flag
/// passed during construction)
Ref<atn::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.)
Token *_startToken;
};
} // namespace antlr4
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