xref: /external/antlr/antlr-3.4/tool/src/main/java/org/antlr/analysis/NFA.java

/*
 * [The "BSD license"]
 *  Copyright (c) 2010 Terence Parr
 *  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
 *      documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
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 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 */
package org.antlr.analysis;

import org.antlr.tool.Grammar;
import org.antlr.tool.NFAFactory;

/** An NFA (collection of NFAStates) constructed from a grammar.  This
 *  NFA is one big machine for entire grammar.  Decision points are recorded
 *  by the Grammar object so we can, for example, convert to DFA or simulate
 *  the NFA (interpret a decision).
 */
public class NFA {
    public static final int INVALID_ALT_NUMBER = -1;

    /** This NFA represents which grammar? */
    public Grammar grammar;

	/** Which factory created this NFA? */
    protected NFAFactory factory = null;

	public boolean complete;

	public NFA(Grammar g) {
        this.grammar = g;
    }

	public int getNewNFAStateNumber() {
		return grammar.composite.getNewNFAStateNumber();
	}

	public void addState(NFAState state) {
		grammar.composite.addState(state);
    }

    public NFAState getState(int s) {
		return grammar.composite.getState(s);
    }

    public NFAFactory getFactory() {
        return factory;
    }

    public void setFactory(NFAFactory factory) {
        this.factory = factory;
    }
}