001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common Development
008: * and Distribution License("CDDL") (collectively, the "License"). You
009: * may not use this file except in compliance with the License. You can obtain
010: * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
011: * or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
012: * language governing permissions and limitations under the License.
013: *
014: * When distributing the software, include this License Header Notice in each
015: * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
016: * Sun designates this particular file as subject to the "Classpath" exception
017: * as provided by Sun in the GPL Version 2 section of the License file that
018: * accompanied this code. If applicable, add the following below the License
019: * Header, with the fields enclosed by brackets [] replaced by your own
020: * identifying information: "Portions Copyrighted [year]
021: * [name of copyright owner]"
022: *
023: * Contributor(s):
024: *
025: * If you wish your version of this file to be governed by only the CDDL or
026: * only the GPL Version 2, indicate your decision by adding "[Contributor]
027: * elects to include this software in this distribution under the [CDDL or GPL
028: * Version 2] license." If you don't indicate a single choice of license, a
029: * recipient has the option to distribute your version of this file under
030: * either the CDDL, the GPL Version 2 or to extend the choice of license to
031: * its licensees as provided above. However, if you add GPL Version 2 code
032: * and therefore, elected the GPL Version 2 license, then the option applies
033: * only if the new code is made subject to such option by the copyright
034: * holder.
035: */
036:
037: package com.sun.tools.xjc.util;
038:
039: import java.text.ParseException;
040: import java.util.regex.Matcher;
041: import java.util.regex.Pattern;
042:
043: /**
044: * Utility class to parse a string
045: *
046: * @author Kohsuke Kawaguchi
047: */
048: public final class StringCutter {
049: private final String original;
050: private String s;
051: private boolean ignoreWhitespace;
052:
053: public StringCutter(String s, boolean ignoreWhitespace) {
054: this .s = this .original = s;
055: this .ignoreWhitespace = ignoreWhitespace;
056: }
057:
058: public void skip(String regexp) throws ParseException {
059: next(regexp);
060: }
061:
062: public String next(String regexp) throws ParseException {
063: trim();
064: Pattern p = Pattern.compile(regexp);
065: Matcher m = p.matcher(s);
066: if (m.lookingAt()) {
067: String r = m.group();
068: s = s.substring(r.length());
069: trim();
070: return r;
071: } else
072: throw error();
073: }
074:
075: private ParseException error() {
076: return new ParseException(original, original.length()
077: - s.length());
078: }
079:
080: public String until(String regexp) throws ParseException {
081: Pattern p = Pattern.compile(regexp);
082: Matcher m = p.matcher(s);
083: if (m.find()) {
084: String r = s.substring(0, m.start());
085: s = s.substring(m.start());
086: if (ignoreWhitespace)
087: r = r.trim();
088: return r;
089: } else {
090: // return everything left
091: String r = s;
092: s = "";
093: return r;
094: }
095: }
096:
097: public char peek() {
098: return s.charAt(0);
099: }
100:
101: private void trim() {
102: if (ignoreWhitespace)
103: s = s.trim();
104: }
105:
106: public int length() {
107: return s.length();
108: }
109: }
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