com.sun.tools.xjc.util.StringCutter Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2021 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package com.sun.tools.xjc.util;
import java.text.ParseException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Utility class to parse a string
*
* @author Kohsuke Kawaguchi
*/
public final class StringCutter {
private final String original;
private String s;
private boolean ignoreWhitespace;
public StringCutter(String s, boolean ignoreWhitespace) {
this.s = this.original = s;
this.ignoreWhitespace = ignoreWhitespace;
}
public void skip(String regexp) throws ParseException {
next(regexp);
}
public String next(String regexp) throws ParseException {
trim();
Pattern p = Pattern.compile(regexp);
Matcher m = p.matcher(s);
if(m.lookingAt()) {
String r = m.group();
s = s.substring(r.length());
trim();
return r;
} else
throw error();
}
private ParseException error() {
return new ParseException(original,original.length()-s.length());
}
public String until(String regexp) throws ParseException {
Pattern p = Pattern.compile(regexp);
Matcher m = p.matcher(s);
if(m.find()) {
String r = s.substring(0,m.start());
s = s.substring(m.start());
if(ignoreWhitespace)
r = r.trim();
return r;
} else {
// return everything left
String r = s;
s = "";
return r;
}
}
public char peek() {
return s.charAt(0);
}
private void trim() {
if(ignoreWhitespace)
s = s.trim();
}
public int length() {
return s.length();
}
}