74 lines
2.5 KiB
Java
74 lines
2.5 KiB
Java
/*
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[The "BSD licence"]
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Copyright (c) 2005-2006 Terence Parr
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.antlr.analysis;
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import org.antlr.tool.Grammar;
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import org.antlr.tool.NFAFactory;
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/** An NFA (collection of NFAStates) constructed from a grammar. This
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* NFA is one big machine for entire grammar. Decision points are recorded
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* by the Grammar object so we can, for example, convert to DFA or simulate
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* the NFA (interpret a decision).
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*/
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public class NFA {
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public static final int INVALID_ALT_NUMBER = -1;
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/** This NFA represents which grammar? */
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public Grammar grammar;
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/** Which factory created this NFA? */
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protected NFAFactory factory = null;
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public boolean complete;
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public NFA(Grammar g) {
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this.grammar = g;
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}
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public int getNewNFAStateNumber() {
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return grammar.composite.getNewNFAStateNumber();
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}
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public void addState(NFAState state) {
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grammar.composite.addState(state);
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}
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public NFAState getState(int s) {
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return grammar.composite.getState(s);
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}
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public NFAFactory getFactory() {
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return factory;
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}
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public void setFactory(NFAFactory factory) {
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this.factory = factory;
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}
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}
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