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/jEdit/tags/jedit-4-0-pre5/gnu/regexp/REException.java

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Java | 164 lines | 39 code | 23 blank | 102 comment | 0 complexity | ac0e3b8cf0f97c688f8adc895275cd47 MD5 | raw file
  1/*
  2 *  gnu/regexp/REException.java
  3 *  Copyright (C) 1998-2001 Wes Biggs
  4 *
  5 *  This library is free software; you can redistribute it and/or modify
  6 *  it under the terms of the GNU Lesser General Public License as published
  7 *  by the Free Software Foundation; either version 2.1 of the License, or
  8 *  (at your option) any later version.
  9 *
 10 *  This library is distributed in the hope that it will be useful,
 11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13 *  GNU Lesser General Public License for more details.
 14 *
 15 *  You should have received a copy of the GNU Lesser General Public License
 16 *  along with this program; if not, write to the Free Software
 17 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 18 */
 19
 20package gnu.regexp;
 21
 22import java.text.MessageFormat;
 23
 24/**
 25 * This is the regular expression exception class.  An exception of this type
 26 * defines the three attributes:
 27 * <OL>
 28 * <LI> A descriptive message of the error.
 29 * <LI> An integral type code equivalent to one of the statically
 30 *      defined symbols listed below.
 31 * <LI> The approximate position in the input string where the error
 32 *      occurred.
 33 * </OL>
 34 *
 35 * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
 36 */
 37
 38public class REException extends Exception {
 39  private int type;
 40  private int pos;
 41
 42  // Error conditions from GNU regcomp(3) manual
 43
 44  /**
 45   * Error flag.
 46   * Invalid use of repetition operators such  as  using
 47   * `*' as the first character.
 48   */
 49  public static final int REG_BADRPT  =  1;
 50
 51  /**
 52   * Error flag.
 53   * Invalid use of back reference operator.
 54   */
 55  public static final int REG_BADBR   =  2;
 56
 57  /**
 58   * Error flag.
 59   * Un-matched brace interval operators.
 60   */
 61  public static final int REG_EBRACE  =  3;
 62
 63  /**
 64   * Error flag.
 65   * Un-matched bracket list operators.
 66   */
 67  public static final int REG_EBRACK  =  4;
 68
 69  /**
 70   * Error flag.
 71   * Invalid  use  of the range operator, eg. the ending
 72   * point of the range occurs  prior  to  the  starting
 73   * point.
 74   */
 75  public static final int REG_ERANGE  =  5;
 76
 77  /**
 78   * Error flag.
 79   * Unknown character class name. <B>Not implemented</B>.
 80   */
 81  public static final int REG_ECTYPE  =  6;
 82
 83  /**
 84   * Error flag.
 85   * Un-matched parenthesis group operators.
 86   */
 87  public static final int REG_EPAREN  =  7;
 88
 89  /**
 90   * Error flag.
 91   * Invalid back reference to a subexpression.
 92   */
 93  public static final int REG_ESUBREG =  8;
 94
 95  /**
 96   * Error flag.
 97   * Non specific error. <B>Not implemented</B>.
 98   */
 99  public static final int REG_EEND    =  9;
100
101  /**
102   * Error flag.
103   * Invalid escape sequence. <B>Not implemented</B>.
104   */
105  public static final int REG_ESCAPE  = 10;
106
107  /**
108   * Error flag.
109   * Invalid  use  of pattern operators such as group or list.
110   */
111  public static final int REG_BADPAT  = 11;
112
113  /**
114   * Error flag.
115   * Compiled  regular  expression  requires  a  pattern
116   * buffer larger than 64Kb. <B>Not implemented</B>.
117   */
118  public static final int REG_ESIZE   = 12;
119
120  /**
121   * Error flag.
122   * The regex routines ran out of memory. <B>Not implemented</B>.
123   */
124  public static final int REG_ESPACE  = 13;
125
126  REException(String msg, int type, int position) { 
127    super(msg); 
128    this.type = type;
129    this.pos = position;
130  }
131
132  /**
133   * Returns the type of the exception, one of the constants listed above.
134   */
135
136  public int getType() {
137    return type;
138  }
139
140  /**
141   * Returns the position, relative to the string or character array being
142   * compiled, where the error occurred.  This position is generally the point
143   * where the error was detected, not necessarily the starting index of
144   * a bad subexpression.
145   */
146  public int getPosition() {
147    return pos;
148  }
149
150  /**
151   * Reports the descriptive message associated with this exception
152   * as well as its index position in the string or character array
153   * being compiled.
154   */
155  public String getMessage() {
156    Object[] args = {new Integer(pos)};
157    StringBuffer sb = new StringBuffer();
158    String prefix = RE.getLocalizedMessage("error.prefix");
159    sb.append(MessageFormat.format(prefix, args));
160    sb.append('\n');
161    sb.append(super.getMessage());
162    return sb.toString();
163  }
164}