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A parsing and analyzing library to get information from a useragent string.
/*
* Yet Another UserAgent Analyzer
* Copyright (C) 2013-2018 Niels Basjes
*
* 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 nl.basjes.parse.useragent.utils;
import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.misc.Interval;
public final class AntlrUtils {
private AntlrUtils() {}
public static String getSourceText(ParserRuleContext ctx){
if (ctx.start == null || ctx.stop == null) {
return ctx.getText();
}
int startIndex = ctx.start.getStartIndex();
int stopIndex = ctx.stop.getStopIndex();
if (stopIndex < startIndex) {
return ""; // Just return the empty string.
}
CharStream inputStream = ctx.start.getInputStream();
return inputStream.getText(new Interval(startIndex, stopIndex));
}
}