org.yuanheng.cookcc.dfa.ECSTable Maven / Gradle / Ivy

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/*
 * Copyright (c) 2008-2013, Heng Yuan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *    Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *    Neither the name of the Heng Yuan nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Heng Yuan ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Heng Yuan BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.yuanheng.cookcc.dfa;

import org.yuanheng.cookcc.lexer.Lexer;

/**
 * Utility class that computes the full table.
 *
 * @author Heng Yuan
 */
public class ECSTable
{
	private final Lexer m_lexer;

	private int[] m_ecs;
	private int[][] m_table;

	public ECSTable (Lexer lexer)
	{
		m_lexer = lexer;
	}

	public int[] getEcs ()
	{
		if (m_ecs == null)
			m_ecs = m_lexer.getECS ().getGroups ().clone ();
		return m_ecs;
	}

	public int[][] getTable ()
	{
		if (m_table == null)
		{
			DFATable dfa = m_lexer.getDFA ();
			int rows = dfa.size ();
			int cols = m_lexer.getECS ().getGroupCount ();
			int[][] table = new int[rows][cols];
			for (int i = 0; i < rows; ++i)
			{
				short[] states = dfa.getRow (i).getStates ();
				int[] array = table[i];
				for (int j = 0; j < cols; ++j)
					array[j] = states[j];
			}
			m_table = table;
		}
		return m_table;
	}

	public int getSize ()
	{
		return m_lexer.getDFA ().size ();
	}
}