| /******************************************************************************* |
| * Copyright (c) 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.osgi.framework.util; |
| |
| /** |
| * Simple tokenizer class. Used to parse data. |
| */ |
| public class Tokenizer { |
| protected char value[]; |
| protected int max; |
| protected int cursor; |
| |
| public Tokenizer(String value) { |
| this.value = value.toCharArray(); |
| max = this.value.length; |
| cursor = 0; |
| } |
| |
| private void skipWhiteSpace() { |
| char[] val = value; |
| int cur = cursor; |
| |
| for (; cur < max; cur++) { |
| char c = val[cur]; |
| if ((c == ' ') || (c == '\t') || (c == '\n') || (c == '\r')) { |
| continue; |
| } |
| break; |
| } |
| cursor = cur; |
| } |
| |
| public String getToken(String terminals) { |
| skipWhiteSpace(); |
| char[] val = value; |
| int cur = cursor; |
| |
| int begin = cur; |
| for (; cur < max; cur++) { |
| char c = val[cur]; |
| if ((terminals.indexOf(c) != -1)) { |
| break; |
| } |
| } |
| cursor = cur; |
| int count = cur - begin; |
| if (count > 0) { |
| skipWhiteSpace(); |
| while (count > 0 && (val[begin + count - 1] == ' ' || val[begin + count - 1] == '\t')) |
| count--; |
| return (new String(val, begin, count)); |
| } |
| return (null); |
| } |
| |
| public String getString(String terminals) { |
| skipWhiteSpace(); |
| char[] val = value; |
| int cur = cursor; |
| |
| if (cur < max) { |
| if (val[cur] == '\"') /* if a quoted string */ |
| { |
| cur++; /* skip quote */ |
| char c = '\0'; |
| int begin = cur; |
| for (; cur < max; cur++) { |
| c = val[cur]; |
| if (c == '\"') { |
| break; |
| } |
| } |
| int count = cur - begin; |
| if (c == '\"') { |
| cur++; |
| } |
| cursor = cur; |
| if (count > 0) { |
| skipWhiteSpace(); |
| return (new String(val, begin, count)); |
| } |
| } else /* not a quoted string; same as token */ |
| { |
| int begin = cur; |
| for (; cur < max; cur++) { |
| char c = val[cur]; |
| if (c == '\"') { |
| // but there could be a quoted string in the middle of the string |
| cur = cur + skipQuotedString(val, cur); |
| } else if ((terminals.indexOf(c) != -1)) { |
| break; |
| } |
| } |
| cursor = cur; |
| int count = cur - begin; |
| if (count > 0) { |
| skipWhiteSpace(); |
| while (count > 0 && (val[begin + count - 1] == ' ' || val[begin + count - 1] == '\t')) |
| count--; |
| return (new String(val, begin, count)); |
| } |
| } |
| } |
| return (null); |
| } |
| |
| private int skipQuotedString(char[] val, int cur) { |
| cur++; /* skip quote */ |
| char c = '\0'; |
| int begin = cur; |
| for (; cur < max; cur++) { |
| c = val[cur]; |
| if (c == '\"') { |
| break; |
| } |
| } |
| int count = cur - begin; |
| if (c == '\"') { |
| cur++; |
| } |
| cursor = cur; |
| if (count > 0) { |
| skipWhiteSpace(); |
| } |
| return count; |
| } |
| |
| public char getChar() { |
| int cur = cursor; |
| if (cur < max) { |
| cursor = cur + 1; |
| return (value[cur]); |
| } |
| return ('\0'); /* end of value */ |
| } |
| |
| public boolean hasMoreTokens() { |
| if (cursor < max) { |
| return true; |
| } |
| return false; |
| } |
| } |