43 lines
1.9 KiB
C
43 lines
1.9 KiB
C
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/* 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 "atn/DecisionEventInfo.h"
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namespace antlr4 {
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namespace atn {
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/// This class represents profiling event information for tracking the lookahead
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/// depth required in order to make a prediction.
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class ANTLR4CPP_PUBLIC LookaheadEventInfo : public DecisionEventInfo {
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public:
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/// The alternative chosen by adaptivePredict(), not necessarily
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/// the outermost alt shown for a rule; left-recursive rules have
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/// user-level alts that differ from the rewritten rule with a (...) block
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/// and a (..)* loop.
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size_t predictedAlt = 0;
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/// <summary>
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/// Constructs a new instance of the <seealso cref="LookaheadEventInfo"/> class with
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/// the specified detailed lookahead information.
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/// </summary>
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/// <param name="decision"> The decision number </param>
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/// <param name="configs"> The final configuration set containing the necessary
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/// information to determine the result of a prediction, or {@code null} if
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/// the final configuration set is not available </param>
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/// <param name="input"> The input token stream </param>
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/// <param name="startIndex"> The start index for the current prediction </param>
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/// <param name="stopIndex"> The index at which the prediction was finally made </param>
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/// <param name="fullCtx"> {@code true} if the current lookahead is part of an LL
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/// prediction; otherwise, {@code false} if the current lookahead is part of
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/// an SLL prediction </param>
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LookaheadEventInfo(size_t decision, ATNConfigSet *configs, size_t predictedAlt, TokenStream *input, size_t startIndex,
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size_t stopIndex, bool fullCtx);
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};
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} // namespace atn
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} // namespace antlr4
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