| /* |
| * Copyright 2009-2012 by The Regents of the University of California |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * you may obtain a copy of the License from |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package edu.uci.ics.asterix.lexergenerator.rulegenerators; |
| |
| import edu.uci.ics.asterix.lexergenerator.LexerNode; |
| import edu.uci.ics.asterix.lexergenerator.rules.RuleChar; |
| import edu.uci.ics.asterix.lexergenerator.rules.RuleEpsilon; |
| |
| public class RuleGeneratorCharOrNothing implements RuleGenerator { |
| |
| @Override |
| public LexerNode generate(String input) throws Exception { |
| LexerNode result = new LexerNode(); |
| if (input == null || input.length() != 1) |
| throw new Exception("Wrong rule format for generator charOrNothing: " + input); |
| result.add(new RuleChar(input.charAt(0))); |
| result.add(new RuleEpsilon()); |
| return result; |
| } |
| |
| } |