mcs/class/System/System.Text.RegularExpressions/BackReferenceConstruct.jvm.cs

   1 //
   2 // BackReferenceConstruct.jvm.cs
   3 //
   4 // Author:
   5 //      Arina Itkes  <arinai@mainsoft.com>
   6 //
   7 // Copyright (C) 2007 Mainsoft, Inc.
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31
  32 using System;
  33 using System.Collections.Generic;
  34 using System.Text;
  35 using java.util.regex;
  36 using java.lang;
  37
  38 namespace System.Text.RegularExpressions
  39 {
  40         sealed class BackReferenceConstruct : IConstructType
  41         {
  42                 private const string NUMBER_BACK_REFERENCE_PATTERN = @"(?<=(?:[^\\]|\A)(?:[\\]{2}){0,1073741823})\\(\d+)";
  43                 private const string NAME_1_BACK_REFERENCE_PATTERN = @"(?<=(?:[^\\]|\A)(?:[\\]{2}){0,1073741823})\\k<(\w+)>";
  44                 private const string NAME_2_BACK_REFERENCE_PATTERN = @"(?<=(?:[^\\]|\A)(?:[\\]{2}){0,1073741823})\\k'(\w+)'";
  45                 private const string NUMBER = @"\d+";
  46
  47
  48                 public bool HasConstruct (string pattern, RegexOptions options) {
  49                         if (JavaUtils.IsMatch (pattern, NUMBER_BACK_REFERENCE_PATTERN)) {
  50                                 return true;
  51                         }
  52
  53                         if (JavaUtils.IsMatch (pattern, NAME_1_BACK_REFERENCE_PATTERN)) {
  54                                 return true;
  55                         }
  56
  57                         return JavaUtils.IsMatch (pattern, NAME_2_BACK_REFERENCE_PATTERN);
  58                 }
  59
  60                 public string Reformat (RegexOptions options,
  61                         string reformattedPattern,
  62                         PatternGrouping patternGrouping) {
  63                         if (!HasConstruct (reformattedPattern, options)) {
  64                                 return reformattedPattern;
  65                         }
  66
  67                         if (patternGrouping.GroupCount >= 0 && patternGrouping.SameGroupsFlag) {
  68                                 return null;
  69                         }
  70
  71                         Matcher m = JavaUtils.Matcher (reformattedPattern, NUMBER_BACK_REFERENCE_PATTERN);
  72                         if (m.find ()) {
  73                                 reformattedPattern = ReplaceGroupNumber (m, reformattedPattern, patternGrouping, options);
  74                                 if (reformattedPattern == null)
  75                                         return null;
  76                         }
  77
  78                         m = JavaUtils.Matcher(reformattedPattern, NAME_1_BACK_REFERENCE_PATTERN);
  79                         if (m.find ()) {
  80                                 reformattedPattern = ReplaceGroupName (m, reformattedPattern, patternGrouping, options);
  81                                 if (reformattedPattern == null)
  82                                         return null;
  83                         }
  84
  85                         m = JavaUtils.Matcher(reformattedPattern, NAME_2_BACK_REFERENCE_PATTERN);
  86                         if (m.find ()) {
  87                                 reformattedPattern = ReplaceGroupName (m, reformattedPattern, patternGrouping, options);
  88                                 if (reformattedPattern == null)
  89                                         return null;
  90                         }
  91
  92                         return reformattedPattern;
  93                 }
  94
  95                 private string ReplaceGroupNumber (Matcher match,
  96                         string reformattedPattern,
  97                         PatternGrouping patternGrouping,
  98                         RegexOptions options) {
  99                         int groupNumber = int.Parse (match.group (1));
 100                         int javaGroupNumber = groupNumber;
 101                         int groupCount = patternGrouping.GroupCount;
 102
 103                         if (groupCount == -1) {
 104                                 if ((options & RegexOptions.ExplicitCapture) == RegexOptions.ExplicitCapture) {
 105                                         groupCount = 0;
 106                                 }
 107                                 else {
 108                                         groupCount = JavaUtils.GroupCount (reformattedPattern);
 109                                 }
 110                         }
 111                         else {
 112                                 javaGroupNumber = patternGrouping.NetToJavaNumbersMap [groupNumber];
 113                         }
 114
 115                         if (groupNumber > groupCount) {
 116                                 return null;
 117                         }
 118
 119                         return match.replaceFirst (@"\\" + javaGroupNumber);
 120                 }
 121
 122                 private string ReplaceGroupName (Matcher match,
 123                         string reformattedPattern,
 124                         PatternGrouping patternGrouping,
 125                         RegexOptions options) {
 126
 127                         if (patternGrouping.GroupCount == -1){
 128                                 return null;
 129                         }
 130
 131                         string groupName = match.group (1);
 132                         Pattern p = Pattern.compile (NUMBER);
 133                         Matcher m = p.matcher ((CharSequence) (object) groupName);
 134                         if (m.matches ()) {
 135                                 return ReplaceGroupNumber (match, reformattedPattern, patternGrouping, options);
 136                         }
 137
 138                         if (!patternGrouping.GroupNameToNumberMap.Contains (groupName)) {
 139                                 return null;
 140                         }
 141
 142                         int javaGroupNumber = patternGrouping.NetToJavaNumbersMap [(int) patternGrouping.GroupNameToNumberMap [groupName]];
 143                         return match.replaceFirst (@"\\" + javaGroupNumber);
 144                 }
 145         }
 146 }