43 lines
1.7 KiB
C++
43 lines
1.7 KiB
C++
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
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* Use of this file is governed by the BSD 3-clause license that
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* can be found in the LICENSE.txt file in the project root.
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*/
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#pragma once
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#include "RecognitionException.h"
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#include "Token.h"
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#include "atn/ATNConfigSet.h"
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namespace antlr4 {
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/// Indicates that the parser could not decide which of two or more paths
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/// to take based upon the remaining input. It tracks the starting token
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/// of the offending input and also knows where the parser was
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/// in the various paths when the error. Reported by reportNoViableAlternative()
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class ANTLR4CPP_PUBLIC NoViableAltException : public RecognitionException {
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public:
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NoViableAltException(Parser *recognizer); // LL(1) error
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NoViableAltException(Parser *recognizer, TokenStream *input,Token *startToken,
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Token *offendingToken, atn::ATNConfigSet *deadEndConfigs, ParserRuleContext *ctx, bool deleteConfigs);
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~NoViableAltException();
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virtual Token* getStartToken() const;
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virtual atn::ATNConfigSet* getDeadEndConfigs() const;
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private:
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/// Which configurations did we try at input.index() that couldn't match input.LT(1)?
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/// Shared pointer that conditionally deletes the configurations (based on flag
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/// passed during construction)
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Ref<atn::ATNConfigSet> _deadEndConfigs;
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/// The token object at the start index; the input stream might
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/// not be buffering tokens so get a reference to it. (At the
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/// time the error occurred, of course the stream needs to keep a
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/// buffer all of the tokens but later we might not have access to those.)
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Token *_startToken;
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};
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} // namespace antlr4
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