98 lines
2.9 KiB
Java
98 lines
2.9 KiB
Java
/*
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* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.tools.internal.xjc.util;
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import java.text.ParseException;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/**
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* Utility class to parse a string
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*
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* @author Kohsuke Kawaguchi
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*/
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public final class StringCutter {
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private final String original;
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private String s;
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private boolean ignoreWhitespace;
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public StringCutter(String s, boolean ignoreWhitespace) {
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this.s = this.original = s;
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this.ignoreWhitespace = ignoreWhitespace;
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}
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public void skip(String regexp) throws ParseException {
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next(regexp);
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}
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public String next(String regexp) throws ParseException {
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trim();
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Pattern p = Pattern.compile(regexp);
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Matcher m = p.matcher(s);
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if(m.lookingAt()) {
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String r = m.group();
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s = s.substring(r.length());
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trim();
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return r;
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} else
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throw error();
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}
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private ParseException error() {
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return new ParseException(original,original.length()-s.length());
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}
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public String until(String regexp) throws ParseException {
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Pattern p = Pattern.compile(regexp);
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Matcher m = p.matcher(s);
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if(m.find()) {
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String r = s.substring(0,m.start());
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s = s.substring(m.start());
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if(ignoreWhitespace)
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r = r.trim();
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return r;
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} else {
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// return everything left
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String r = s;
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s = "";
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return r;
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}
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}
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public char peek() {
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return s.charAt(0);
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}
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private void trim() {
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if(ignoreWhitespace)
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s = s.trim();
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}
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public int length() {
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return s.length();
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}
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}
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