/* * Copyright 2010 NCHOVY * * 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 at * * 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 org.krakenapps.bnf; import java.nio.BufferUnderflowException; import java.text.ParseException; public class ChoiceRule implements Rule { private Rule[] rules; public ChoiceRule(Rule... rules) { this.rules = rules; } public Rule[] getRules() { return rules; } @Override public Result eval(String text, int position, ParserContext ctx) throws ParseException { for (Rule rule : rules) { try { return rule.eval(text, position, ctx); } catch (ParseException e) { } catch (BufferUnderflowException e) { } } throw new ParseException("syntax error, position " + position, position); } @Override public String toString() { return "choice (rule " + rules.length + ")"; } }