001    /*
002     * Copyright (C) 2012 eXo Platform SAS.
003     *
004     * This is free software; you can redistribute it and/or modify it
005     * under the terms of the GNU Lesser General Public License as
006     * published by the Free Software Foundation; either version 2.1 of
007     * the License, or (at your option) any later version.
008     *
009     * This software is distributed in the hope that it will be useful,
010     * but WITHOUT ANY WARRANTY; without even the implied warranty of
011     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012     * Lesser General Public License for more details.
013     *
014     * You should have received a copy of the GNU Lesser General Public
015     * License along with this software; if not, write to the Free
016     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018     */
019    package org.crsh.lang.script;
020    
021    import org.crsh.command.SyntaxException;
022    import org.crsh.util.Utils;
023    
024    /**
025     * @author Julien Viet
026     */
027    public class Token {
028    
029      /** . */
030      public final String value;
031    
032      /** . */
033      public final Token next;
034    
035      public Token(String value, Token next) {
036        this.value = value;
037        this.next = next;
038      }
039    
040      public PipeLineFactory createFactory() throws SyntaxException {
041        if (next != null) {
042          if (value == null) {
043            throw new SyntaxException("");
044          } else {
045            PipeLineFactory nextFactory = next.createFactory();
046            if (nextFactory != null) {
047              return new PipeLineFactory(value, nextFactory);
048            } else {
049              throw new SyntaxException("");
050            }
051          }
052        } else {
053          return Utils.notBlank(value) ? new PipeLineFactory(value, null) : null;
054        }
055      }
056    
057      public Token getLast() {
058        return next != null ? next.getLast() : this;
059      }
060    
061      public static Token parse(CharSequence s) {
062        return parse(s, 0);
063      }
064    
065      public static Token parse(final CharSequence s, final int index) {
066        Character lastQuote = null;
067        int pos = index;
068        while (pos < s.length()) {
069          char c = s.charAt(pos);
070          if (lastQuote == null) {
071            if (c == '|') {
072              break;
073            } else if (c == '"' || c == '\'') {
074              lastQuote = c;
075            }
076          } else {
077            if (lastQuote == c) {
078              lastQuote = null;
079            }      }
080          pos++;
081        }
082        Token next = pos < s.length() ? parse(s, pos + 1) : null;
083        return new Token(s.subSequence(index, pos).toString(), next);
084      }
085    }