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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.
 */

package org.antlr.v4.runtime.atn;

import org.antlr.v4.runtime.dfa.DFA;

import java.util.ArrayList;
import java.util.List;

/**
 * This class provides access to specific and aggregate statistics gathered
 * during profiling of a parser.
 *
 * @since 4.3
 */
public class ParseInfo {
	protected final ProfilingATNSimulator atnSimulator;

	public ParseInfo(ProfilingATNSimulator atnSimulator) {
		this.atnSimulator = atnSimulator;
	}

	/**
	 * Gets an array of {@link DecisionInfo} instances containing the profiling
	 * information gathered for each decision in the ATN.
	 *
	 * @return An array of {@link DecisionInfo} instances, indexed by decision
	 * number.
	 */
	public DecisionInfo[] getDecisionInfo() {
		return atnSimulator.getDecisionInfo();
	}

	/**
	 * Gets the decision numbers for decisions that required one or more
	 * full-context predictions during parsing. These are decisions for which
	 * {@link DecisionInfo#LL_Fallback} is non-zero.
	 *
	 * @return A list of decision numbers which required one or more
	 * full-context predictions during parsing.
	 */
	public List getLLDecisions() {
		DecisionInfo[] decisions = atnSimulator.getDecisionInfo();
		List LL = new ArrayList();
		for (int i=0; i0 ) LL.add(i);
		}
		return LL;
	}

	/**
	 * Gets the total time spent during prediction across all decisions made
	 * during parsing. This value is the sum of
	 * {@link DecisionInfo#timeInPrediction} for all decisions.
	 */
	public long getTotalTimeInPrediction() {
		DecisionInfo[] decisions = atnSimulator.getDecisionInfo();
		long t = 0;
		for (int i=0; i
	 * This value is the sum of {@link #getTotalSLLATNLookaheadOps} and
	 * {@link #getTotalLLATNLookaheadOps}.

*/ public long getTotalATNLookaheadOps() { DecisionInfo[] decisions = atnSimulator.getDecisionInfo(); long k = 0; for (int i = 0; i < decisions.length; i++) { k += decisions[i].SLL_ATNTransitions; k += decisions[i].LL_ATNTransitions; } return k; } /** * Gets the total number of DFA states stored in the DFA cache for all * decisions in the ATN. */ public int getDFASize() { int n = 0; DFA[] decisionToDFA = atnSimulator.decisionToDFA; for (int i = 0; i < decisionToDFA.length; i++) { n += getDFASize(i); } return n; } /** * Gets the total number of DFA states stored in the DFA cache for a * particular decision. */ public int getDFASize(int decision) { DFA decisionToDFA = atnSimulator.decisionToDFA[decision]; return decisionToDFA.states.size(); } }




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