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 */ 019 020 package org.crsh.shell.impl.command; 021 022 import org.crsh.command.ScriptException; 023 024 class Tokenizer { 025 026 /** . */ 027 private final CharSequence s; 028 029 /** . */ 030 private int index; 031 032 /** . */ 033 private Character c; 034 035 /** 036 * Create a new tokenizer. 037 * 038 * @param s the sequence to tokenize 039 * @throws NullPointerException if the sequence is null 040 */ 041 public Tokenizer(CharSequence s) throws NullPointerException { 042 if (s == null) { 043 throw new NullPointerException(); 044 } 045 this.s = s; 046 this.index = 0; 047 048 // Initialize state 049 // index points to next char to read 050 // c = s.charAt(index - 1); 051 this.c = index < s.length() ? s.charAt(index++) : null; 052 } 053 054 private void next() { 055 if (index < s.length()) { 056 c = s.charAt(index++); 057 } else { 058 c = null; 059 } 060 } 061 062 public Token nextToken() { 063 if (c == null) { 064 return Token.EOF; 065 } else { 066 switch (c) { 067 case '|': 068 next(); 069 return Token.PIPE; 070 default: 071 return parseCommand(); 072 } 073 } 074 } 075 076 private Token parseCommand() throws ScriptException { 077 078 // 079 StringBuilder line = new StringBuilder(); 080 081 // 082 Character lastQuote = null; 083 while (c != null) { 084 if (lastQuote == null && (c == '+' || c == '|')) { 085 break; 086 } else { 087 line.append(c); 088 switch (c) { 089 case '"': 090 case '\'': 091 if (lastQuote == null) { 092 lastQuote = c; 093 } else if (lastQuote != c) { 094 } else { 095 lastQuote = null; 096 } 097 break; 098 default: 099 break; 100 } 101 } 102 103 // 104 next(); 105 } 106 107 // 108 return new Token.Command(line.toString()); 109 } 110 }