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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 "antlr4-common.h"
namespace antlr4 {
namespace atn {
/// <summary>
/// This is the base class for gathering detailed information about prediction
/// events which occur during parsing.
///
/// Note that we could record the parser call stack at the time this event
/// occurred but in the presence of left recursive rules, the stack is kind of
/// meaningless. It's better to look at the individual configurations for their
/// individual stacks. Of course that is a <seealso cref="PredictionContext"/> object
/// not a parse tree node and so it does not have information about the extent
/// (start...stop) of the various subtrees. Examining the stack tops of all
/// configurations provide the return states for the rule invocations.
/// From there you can get the enclosing rule.
///
/// @since 4.3
/// </summary>
class ANTLR4CPP_PUBLIC DecisionEventInfo {
public:
/// <summary>
/// The invoked decision number which this event is related to.
/// </summary>
/// <seealso cref= ATN#decisionToState </seealso>
const size_t decision;
/// <summary>
/// The configuration set containing additional information relevant to the
/// prediction state when the current event occurred, or {@code null} if no
/// additional information is relevant or available.
/// </summary>
const ATNConfigSet *configs;
/// <summary>
/// The input token stream which is being parsed.
/// </summary>
const TokenStream *input;
/// <summary>
/// The token index in the input stream at which the current prediction was
/// originally invoked.
/// </summary>
const size_t startIndex;
/// <summary>
/// The token index in the input stream at which the current event occurred.
/// </summary>
const size_t stopIndex;
/// <summary>
/// {@code true} if the current event occurred during LL prediction;
/// otherwise, {@code false} if the input occurred during SLL prediction.
/// </summary>
const bool fullCtx;
DecisionEventInfo(size_t decision, ATNConfigSet *configs, TokenStream *input, size_t startIndex,
size_t stopIndex, bool fullCtx);
};
} // namespace atn
} // namespace antlr4
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