| /* |
| * [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. |
| * IN NO EVENT SHALL THE AUTHOR 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.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; |
| } |
| } |
| |