org.antlr.v4.runtime.atn.DecisionEventInfo Maven / Gradle / Ivy
/*
* [The "BSD license"]
* Copyright (c) 2014 Terence Parr
* Copyright (c) 2014 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
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* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
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package org.antlr.v4.runtime.atn;
import org.antlr.v4.runtime.TokenStream;
import org.antlr.v4.runtime.misc.NotNull;
import org.antlr.v4.runtime.misc.Nullable;
/**
* This is the base class for gathering detailed information about prediction
* events which occur during parsing.
*
* @since 4.3
*/
public class DecisionEventInfo {
/**
* The invoked decision number which this event is related to.
*
* @see ATN#decisionToState
*/
public final int decision;
/**
* 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.
*/
@Nullable
public final ATNConfigSet configs;
/**
* The input token stream which is being parsed.
*/
@NotNull
public final TokenStream input;
/**
* The token index in the input stream at which the current prediction was
* originally invoked.
*/
public final int startIndex;
/**
* The token index in the input stream at which the current event occurred.
*/
public final int stopIndex;
/**
* {@code true} if the current event occurred during LL prediction;
* otherwise, {@code false} if the input occurred during SLL prediction.
*/
public final boolean fullCtx;
public DecisionEventInfo(int decision, @Nullable ATNConfigSet configs,
@NotNull TokenStream input, int startIndex,
int stopIndex, boolean fullCtx)
{
this.decision = decision;
this.fullCtx = fullCtx;
this.stopIndex = stopIndex;
this.input = input;
this.startIndex = startIndex;
this.configs = configs;
}
}