/*
* 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 + ")";
}
}