summaryrefslogtreecommitdiffstats
path: root/libemailfunctions/email.cpp
blob: b11b1837cd36ee65e504ad378aa722a86868f652 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
/*  -*- mode: C++; c-file-style: "gnu" -*-

    This file is part of tdepim.
    Copyright (c) 2004 KDEPIM developers

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/
#include "email.h"

#include <kdebug.h>
#include <klocale.h>
#include <kidna.h>
#include <kmime_util.h>

#include <tqregexp.h>

//-----------------------------------------------------------------------------
TQStringList KPIM::splitEmailAddrList(const TQString& aStr)
{
  // Features:
  // - always ignores quoted characters
  // - ignores everything (including parentheses and commas)
  //   inside quoted strings
  // - supports nested comments
  // - ignores everything (including double quotes and commas)
  //   inside comments

  TQStringList list;

  if (aStr.isEmpty())
    return list;

  TQString addr;
  uint addrstart = 0;
  int commentlevel = 0;
  bool insidequote = false;

  for (uint index=0; index<aStr.length(); index++) {
    // the following conversion to latin1 is o.k. because
    // we can safely ignore all non-latin1 characters
    switch (aStr[index].latin1()) {
    case '"' : // start or end of quoted string
      if (commentlevel == 0)
        insidequote = !insidequote;
      break;
    case '(' : // start of comment
      if (!insidequote)
        commentlevel++;
      break;
    case ')' : // end of comment
      if (!insidequote) {
        if (commentlevel > 0)
          commentlevel--;
        else {
          kdDebug(5300) << "Error in address splitting: Unmatched ')'"
                        << endl;
          return list;
        }
      }
      break;
    case '\\' : // quoted character
      index++; // ignore the quoted character
      break;
    case ',' :
    case ';' :
      if (!insidequote && (commentlevel == 0)) {
        addr = aStr.mid(addrstart, index-addrstart);
        if (!addr.isEmpty())
          list += addr.simplifyWhiteSpace();
        addrstart = index+1;
      }
      break;
    }
  }
  // append the last address to the list
  if (!insidequote && (commentlevel == 0)) {
    addr = aStr.mid(addrstart, aStr.length()-addrstart);
    if (!addr.isEmpty())
      list += addr.simplifyWhiteSpace();
  }
  else
    kdDebug(5300) << "Error in address splitting: "
                  << "Unexpected end of address list"
                  << endl;

  return list;
}

//-----------------------------------------------------------------------------
// Used by KPIM::splitAddress(...) and KPIM::getFirstEmailAddress(...).
KPIM::EmailParseResult splitAddressInternal( const TQCString& address,
                                             TQCString & displayName,
                                             TQCString & addrSpec,
                                             TQCString & comment,
                                             bool allowMultipleAddresses )
{
//  kdDebug() << "KMMessage::splitAddress( " << address << " )" << endl;

  displayName = "";
  addrSpec = "";
  comment = "";
  
  // these strings are later copied to displayName resp. addrSpec resp. comment
  // we don't operate directly on those variables, since as ByteArray deriverates
  // they have a miserable performance on operator+
  TQString dName;
  TQString aSpec;
  TQString cmmt;
  
  if ( address.isEmpty() )
    return KPIM::AddressEmpty;

  // The following is a primitive parser for a mailbox-list (cf. RFC 2822).
  // The purpose is to extract a displayable string from the mailboxes.
  // Comments in the addr-spec are not handled. No error checking is done.

  enum { TopLevel, InComment, InAngleAddress } context = TopLevel;
  bool inQuotedString = false;
  int commentLevel = 0;
  bool stop = false;

  for ( const char* p = address.data(); *p && !stop; ++p ) {
    switch ( context ) {
    case TopLevel : {
      switch ( *p ) {
      case '"' : inQuotedString = !inQuotedString;
                 dName += *p;
                 break;
      case '(' : if ( !inQuotedString ) {
                   context = InComment;
                   commentLevel = 1;
                 }
                 else
                   dName += *p;
                 break;
      case '<' : if ( !inQuotedString ) {
                   context = InAngleAddress;
                 }
                 else
                   dName += *p;
                 break;
      case '\\' : // quoted character
                 dName += *p;
                 ++p; // skip the '\'
                 if ( *p )
                   dName += *p;
                 else
                   return KPIM::UnexpectedEnd;
                 break;
          case ',' :
          case ';' : if ( !inQuotedString ) {
                   if ( allowMultipleAddresses )
                     stop = true;
                   else
                     return KPIM::UnexpectedComma;
                 }
                 else
                   dName += *p;
                 break;
      default :  dName += *p;
      }
      break;
    }
    case InComment : {
      switch ( *p ) {
      case '(' : ++commentLevel;
                 cmmt += *p;
                 break;
      case ')' : --commentLevel;
                 if ( commentLevel == 0 ) {
                   context = TopLevel;
                   cmmt += ' '; // separate the text of several comments
                 }
                 else
                   cmmt += *p;
                 break;
      case '\\' : // quoted character
                 cmmt += *p;
                 ++p; // skip the '\'
                 if ( *p )
                   cmmt += *p;
                 else
                   return KPIM::UnexpectedEnd;
                 break;
      default :  cmmt += *p;
      }
      break;
    }
    case InAngleAddress : {
      switch ( *p ) {
      case '"' : inQuotedString = !inQuotedString;
                 aSpec += *p;
                 break;
      case '>' : if ( !inQuotedString ) {
                   context = TopLevel;
                 }
                 else
                   aSpec += *p;
                 break;
      case '\\' : // quoted character
                 aSpec += *p;
                 ++p; // skip the '\'
                 if ( *p )
                   aSpec += *p;
                 else
                   return KPIM::UnexpectedEnd;
                 break;
      default :  aSpec += *p;
      }
      break;
    }
    } // switch ( context )
  }
  // check for errors
  if ( inQuotedString )
    return KPIM::UnbalancedQuote;
  if ( context == InComment )
    return KPIM::UnbalancedParens;
  if ( context == InAngleAddress )
    return KPIM::UnclosedAngleAddr;

	
  displayName = dName.stripWhiteSpace().latin1();
  comment = cmmt.stripWhiteSpace().latin1();
  addrSpec = aSpec.stripWhiteSpace().latin1();

  if ( addrSpec.isEmpty() ) {
    if ( displayName.isEmpty() )
      return KPIM::NoAddressSpec;
    else {
      addrSpec = displayName;
      displayName.truncate( 0 );
    }
  }
/*
  kdDebug() << "display-name : \"" << displayName << "\"" << endl;
  kdDebug() << "comment      : \"" << comment << "\"" << endl;
  kdDebug() << "addr-spec    : \"" << addrSpec << "\"" << endl;
*/
  return KPIM::AddressOk;
}


//-----------------------------------------------------------------------------
KPIM::EmailParseResult KPIM::splitAddress( const TQCString& address,
                                           TQCString & displayName,
                                           TQCString & addrSpec,
                                           TQCString & comment )
{
  return splitAddressInternal( address, displayName, addrSpec, comment,
                               false /* don't allow multiple addresses */ );
}


//-----------------------------------------------------------------------------
KPIM::EmailParseResult KPIM::splitAddress( const TQString & address,
                                           TQString & displayName,
                                           TQString & addrSpec,
                                           TQString & comment )
{
  TQCString d, a, c;
  KPIM::EmailParseResult result = splitAddress( address.utf8(), d, a, c );
  if ( result == AddressOk ) {
    displayName = TQString::fromUtf8( d );
    addrSpec = TQString::fromUtf8( a );
    comment = TQString::fromUtf8( c );
  }
  return result;
}


//-----------------------------------------------------------------------------
KPIM::EmailParseResult KPIM::isValidEmailAddress( const TQString& aStr )
{
  // If we are passed an empty string bail right away no need to process further
  // and waste resources
  if ( aStr.isEmpty() ) {
    return AddressEmpty;
  }

  // count how many @'s are in the string that is passed to us
  // if 0 or > 1 take action
  // at this point to many @'s cannot bail out right away since
  // @ is allowed in qoutes, so we use a bool to keep track
  // and then make a judgement further down in the parser
  // FIXME count only @ not in double quotes

  bool tooManyAtsFlag = false;

  int atCount = aStr.contains('@');
  if ( atCount > 1 ) {
    tooManyAtsFlag = true;;
  } else if ( atCount == 0 ) {
	  return TooFewAts;
  }

  // The main parser, try and catch all weird and wonderful
  // mistakes users and/or machines can create

  enum { TopLevel, InComment, InAngleAddress } context = TopLevel;
  bool inQuotedString = false;
  int commentLevel = 0;

  unsigned int strlen = aStr.length();

  for ( unsigned int index=0; index < strlen; index++ ) {
    switch ( context ) {
    case TopLevel : {
      switch ( aStr[index].latin1() ) {
        case '"' : inQuotedString = !inQuotedString;
          break;
        case '(' :
          if ( !inQuotedString ) {
            context = InComment;
            commentLevel = 1;
          }
          break;
        case '[' :
          if ( !inQuotedString ) {
            return InvalidDisplayName;
          }
          break;
        case ']' :
          if ( !inQuotedString ) {
            return InvalidDisplayName;
          }
          break;
        case ':' :
          if ( !inQuotedString ) {
            return DisallowedChar;
          }
          break;
        case '<' :
          if ( !inQuotedString ) {
            context = InAngleAddress;
          }
          break;
        case '\\' : // quoted character
          ++index; // skip the '\'
          if (( index + 1 )> strlen ) {
            return UnexpectedEnd;
          }
          break;
            case ',' :
            case ';' :
          if ( !inQuotedString )
            return UnexpectedComma;
          break;
        case ')' :
          if ( !inQuotedString )
            return UnbalancedParens;
          break;
        case '>' :
          if ( !inQuotedString )
            return UnopenedAngleAddr;
          break;
        case '@' :
          if ( !inQuotedString ) {
            if ( index == 0 ) {  // Missing local part
              return MissingLocalPart;
            } else if( index == strlen-1 ) {
              return MissingDomainPart;
            }
          } else if ( inQuotedString ) {
            --atCount;
            if ( atCount == 1 ) {
              tooManyAtsFlag = false;
            }
          }
          break;
      }
      break;
    }
    case InComment : {
      switch ( aStr[index] ) {
        case '(' : ++commentLevel;
          break;
        case ')' : --commentLevel;
          if ( commentLevel == 0 ) {
            context = TopLevel;
          }
          break;
        case '\\' : // quoted character
          ++index; // skip the '\'
          if (( index + 1 )> strlen ) {
            return UnexpectedEnd;
          }
          break;
        }
        break;
    }

    case InAngleAddress : {
      switch ( aStr[index] ) {
            case ',' :
            case ';' :
          if ( !inQuotedString ) {
            return UnexpectedComma;
          }
          break;
        case '"' : inQuotedString = !inQuotedString;
            break;
        case '@' :
          if ( inQuotedString ) {
            --atCount;
            if ( atCount == 1 ) {
              tooManyAtsFlag = false;
            }
          }
          break;
        case '>' :
          if ( !inQuotedString ) {
            context = TopLevel;
            break;
          }
          break;
        case '\\' : // quoted character
          ++index; // skip the '\'
          if (( index + 1 )> strlen ) {
            return UnexpectedEnd;
          }
          break;
        }
        break;
      }
    }
  }

  if ( atCount == 0 && !inQuotedString )
    return TooFewAts;

  if ( inQuotedString )
    return UnbalancedQuote;

  if ( context == InComment )
    return UnbalancedParens;

  if ( context == InAngleAddress )
    return UnclosedAngleAddr;

  if ( tooManyAtsFlag ) {
    return TooManyAts;
  }
  return AddressOk;
}

//-----------------------------------------------------------------------------
TQString KPIM::emailParseResultToString( EmailParseResult errorCode )
{
  switch ( errorCode ) {
    case TooManyAts :
      return i18n("The email address you entered is not valid because it "
                "contains more than one @. "
                "You will not create valid messages if you do not "
                "change your address.");
    case TooFewAts :
      return i18n("The email address you entered is not valid because it "
                "does not contain a @."
                "You will not create valid messages if you do not "
                "change your address.");
    case AddressEmpty :
      return i18n("You have to enter something in the email address field.");
    case MissingLocalPart :
      return i18n("The email address you entered is not valid because it "
                "does not contain a local part.");
    case MissingDomainPart :
      return i18n("The email address you entered is not valid because it "
                "does not contain a domain part.");
    case UnbalancedParens :
      return i18n("The email address you entered is not valid because it "
                "contains unclosed comments/brackets.");
    case AddressOk :
      return i18n("The email address you entered is valid.");
    case UnclosedAngleAddr :
      return i18n("The email address you entered is not valid because it "
                "contains an unclosed anglebracket.");
    case UnopenedAngleAddr :
      return i18n("The email address you entered is not valid because it "
                "contains an unopened anglebracket.");
    case UnexpectedComma :
      return i18n("The email address you have entered is not valid because it "
                "contains an unexpected comma.");
    case UnexpectedEnd :
      return i18n("The email address you entered is not valid because it ended "
                "unexpectedly, this probably means you have used an escaping type "
                "character like an \\  as the last character in your email "
                "address.");
    case UnbalancedQuote :
      return i18n("The email address you entered is not valid because it "
                  "contains quoted text which does not end.");
    case NoAddressSpec :
      return i18n("The email address you entered is not valid because it "
                  "does not seem to contain an actual email address, i.e. "
                  "something of the form [email protected].");
    case DisallowedChar :
      return i18n("The email address you entered is not valid because it "
                  "contains an illegal character.");
    case InvalidDisplayName :
      return i18n("The email address you have entered is not valid because it "
                  "contains an invalid displayname.");
  }
  return i18n("Unknown problem with email address");
}

//-----------------------------------------------------------------------------
bool KPIM::isValidSimpleEmailAddress( const TQString& aStr )
{
  // If we are passed an empty string bail right away no need to process further
  // and waste resources
  if ( aStr.isEmpty() ) {
    return false;
  }

  int atChar = aStr.findRev( '@' );
  TQString domainPart = aStr.mid( atChar + 1);
  TQString localPart = aStr.left( atChar );
  bool tooManyAtsFlag = false;
  bool inQuotedString = false;
  int atCount = localPart.contains( '@' );

  unsigned int strlen = localPart.length();
  for ( unsigned int index=0; index < strlen; index++ ) {
    switch( localPart[ index ].latin1() ) {
      case '"' : inQuotedString = !inQuotedString;
        break;
      case '@' :
        if ( inQuotedString ) {
          --atCount;
          if ( atCount == 0 ) {
            tooManyAtsFlag = false;
          }
        }
        break;
      }
  }

  TQString addrRx = "[a-zA-Z]*[~|{}`\\^?=/+*'&%$#!_\\w.-]*[~|{}`\\^?=/+*'&%$#!_a-zA-Z0-9-]@";
  if ( localPart[ 0 ] == '\"' || localPart[ localPart.length()-1 ] == '\"' ) {
    addrRx = "\"[a-zA-Z@]*[\\w.@-]*[a-zA-Z0-9@]\"@";
  }
  if ( domainPart[ 0 ] == '[' || domainPart[ domainPart.length()-1 ] == ']' ) {
    addrRx += "\\[[0-9]{,3}(\\.[0-9]{,3}){3}\\]";
  } else {
    addrRx += "[\\w-]+(\\.[\\w-]+)*";
  }
  TQRegExp rx( addrRx );
  return  rx.exactMatch( aStr ) && !tooManyAtsFlag;
}

//-----------------------------------------------------------------------------
TQString KPIM::simpleEmailAddressErrorMsg()
{
      return i18n("The email address you entered is not valid because it "
                  "does not seem to contain an actual email address, i.e. "
                  "something of the form [email protected].");
}
//-----------------------------------------------------------------------------
TQCString KPIM::getEmailAddress( const TQCString & address )
{
  TQCString dummy1, dummy2, addrSpec;
  KPIM::EmailParseResult result =
    splitAddressInternal( address, dummy1, addrSpec, dummy2,
                          false /* don't allow multiple addresses */ );
  if ( result != AddressOk ) {
    addrSpec = TQCString();
    kdDebug() // << k_funcinfo << "\n"
              << "Input: aStr\nError:"
              << emailParseResultToString( result ) << endl;
  }

  return addrSpec;
}


//-----------------------------------------------------------------------------
TQString KPIM::getEmailAddress( const TQString & address )
{
  return TQString::fromUtf8( getEmailAddress( address.utf8() ) );
}


//-----------------------------------------------------------------------------
TQCString KPIM::getFirstEmailAddress( const TQCString & addresses )
{
  TQCString dummy1, dummy2, addrSpec;
  KPIM::EmailParseResult result =
    splitAddressInternal( addresses, dummy1, addrSpec, dummy2,
                          true /* allow multiple addresses */ );
  if ( result != AddressOk ) {
    addrSpec = TQCString();
    kdDebug() // << k_funcinfo << "\n"
              << "Input: aStr\nError:"
              << emailParseResultToString( result ) << endl;
  }

  return addrSpec;
}


//-----------------------------------------------------------------------------
TQString KPIM::getFirstEmailAddress( const TQString & addresses )
{
  return TQString::fromUtf8( getFirstEmailAddress( addresses.utf8() ) );
}


//-----------------------------------------------------------------------------
bool KPIM::getNameAndMail(const TQString& aStr, TQString& name, TQString& mail)
{
  name = TQString();
  mail = TQString();

  const int len=aStr.length();
  const char cQuotes = '"';

  bool bInComment = false;
  bool bInQuotesOutsideOfEmail = false;
  int i=0, iAd=0, iMailStart=0, iMailEnd=0;
  TQChar c;
  unsigned int commentstack = 0;

  // Find the '@' of the email address
  // skipping all '@' inside "(...)" comments:
  while( i < len ){
    c = aStr[i];
    if( '(' == c ) commentstack++;
    if( ')' == c ) commentstack--;
    bInComment = commentstack != 0;
    if( '"' == c && !bInComment ) 
        bInQuotesOutsideOfEmail = !bInQuotesOutsideOfEmail;

    if( !bInComment && !bInQuotesOutsideOfEmail ){
      if( '@' == c ){
        iAd = i;
        break; // found it
      }
    }
    ++i;
  }

  if ( !iAd ) {
    // We suppose the user is typing the string manually and just
    // has not finished typing the mail address part.
    // So we take everything that's left of the '<' as name and the rest as mail
    for( i = 0; len > i; ++i ) {
      c = aStr[i];
      if( '<' != c )
        name.append( c );
      else
        break;
    }
    mail = aStr.mid( i+1 );
    if ( mail.endsWith( ">" ) )
      mail.truncate( mail.length() - 1 );

  } else {
    // Loop backwards until we find the start of the string
    // or a ',' that is outside of a comment
    //          and outside of quoted text before the leading '<'.
    bInComment = false;
    bInQuotesOutsideOfEmail = false;
    for( i = iAd-1; 0 <= i; --i ) {
      c = aStr[i];
      if( bInComment ) {
        if( '(' == c ) {
          if( !name.isEmpty() )
            name.prepend( ' ' );
          bInComment = false;
        } else {
          name.prepend( c ); // all comment stuff is part of the name
        }
      }else if( bInQuotesOutsideOfEmail ){
        if( cQuotes == c )
          bInQuotesOutsideOfEmail = false;
        else if ( c != '\\' )
          name.prepend( c );
      }else{
        // found the start of this addressee ?
        if( ',' == c )
          break;
        // stuff is before the leading '<' ?
        if( iMailStart ){
          if( cQuotes == c )
            bInQuotesOutsideOfEmail = true; // end of quoted text found
          else {
            name.prepend( c );
          }
        }else{
          switch( c ){
            case '<':
              iMailStart = i;
              break;
            case ')':
              if( !name.isEmpty() )
                name.prepend( ' ' );
              bInComment = true;
              break;
            default:
              if( ' ' != c )
                mail.prepend( c );
          }
        }
      }
    }

    name = name.simplifyWhiteSpace();
    mail = mail.simplifyWhiteSpace();

    if( mail.isEmpty() )
      return false;

    mail.append('@');

    // Loop forward until we find the end of the string
    // or a ',' that is outside of a comment
    //          and outside of quoted text behind the trailing '>'.
    bInComment = false;
    bInQuotesOutsideOfEmail = false;
    int parenthesesNesting = 0;
    for( i = iAd+1; len > i; ++i ) {
      c = aStr[i];
      if( bInComment ){
        if( ')' == c ){
          if ( --parenthesesNesting == 0 ) {
            bInComment = false;
            if( !name.isEmpty() )
              name.append( ' ' );
          } else {
            // nested ")", add it
            name.append( ')' ); // name can't be empty here
          }
        } else {
          if( '(' == c ) {
            // nested "("
            ++parenthesesNesting;
          }
          name.append( c ); // all comment stuff is part of the name
        }
      }else if( bInQuotesOutsideOfEmail ){
        if( cQuotes == c )
          bInQuotesOutsideOfEmail = false;
        else  if ( c != '\\' )
          name.append( c );
      }else{
        // found the end of this addressee ?
        if( ',' == c )
          break;
        // stuff is behind the trailing '>' ?
        if( iMailEnd ){
          if( cQuotes == c )
            bInQuotesOutsideOfEmail = true; // start of quoted text found
          else
            name.append( c );
        }else{
          switch( c ){
            case '>':
              iMailEnd = i;
              break;
            case '(':
              if( !name.isEmpty() )
                name.append( ' ' );
              if ( ++parenthesesNesting > 0 )
                bInComment = true;
              break;
            default:
              if( ' ' != c )
                mail.append( c );
          }
        }
      }
    }
  }

  name = name.simplifyWhiteSpace();
  mail = mail.simplifyWhiteSpace();

  return ! (name.isEmpty() || mail.isEmpty());
}


//-----------------------------------------------------------------------------
bool KPIM::compareEmail( const TQString& email1, const TQString& email2,
                         bool matchName )
{
  TQString e1Name, e1Email, e2Name, e2Email;

  getNameAndMail( email1, e1Name, e1Email );
  getNameAndMail( email2, e2Name, e2Email );

  return e1Email == e2Email &&
    ( !matchName || ( e1Name == e2Name ) );
}


//-----------------------------------------------------------------------------
TQString KPIM::normalizedAddress( const TQString & displayName,
                                 const TQString & addrSpec,
                                 const TQString & comment )
{
  TQString realDisplayName = displayName;
  realDisplayName.remove( TQChar( 0x202D ) );
  realDisplayName.remove( TQChar( 0x202E ) );
  realDisplayName.remove( TQChar( 0x202A ) );
  realDisplayName.remove( TQChar( 0x202B ) );

  if ( realDisplayName.isEmpty() && comment.isEmpty() )
    return addrSpec;
  else if ( comment.isEmpty() )
    return quoteNameIfNecessary( realDisplayName ) + " <" + addrSpec + ">";
  else if ( realDisplayName.isEmpty() ) {
    TQString commentStr = comment;
    return quoteNameIfNecessary( commentStr ) + " <" + addrSpec + ">";
  }
  else
    return realDisplayName + " (" + comment + ") <" + addrSpec + ">";
}


//-----------------------------------------------------------------------------
TQString KPIM::decodeIDN( const TQString & addrSpec )
{
  const int atPos = addrSpec.findRev( '@' );
  if ( atPos == -1 )
    return addrSpec;

  TQString idn = KIDNA::toUnicode( addrSpec.mid( atPos + 1 ) );
  if ( idn.isEmpty() )
    return TQString();

  return addrSpec.left( atPos + 1 ) + idn;
}


//-----------------------------------------------------------------------------
TQString KPIM::encodeIDN( const TQString & addrSpec )
{
  const int atPos = addrSpec.findRev( '@' );
  if ( atPos == -1 )
    return addrSpec;

  TQString idn = KIDNA::toAscii( addrSpec.mid( atPos + 1 ) );
  if ( idn.isEmpty() )
    return addrSpec;

  return addrSpec.left( atPos + 1 ) + idn;
}


//-----------------------------------------------------------------------------
TQString KPIM::normalizeAddressesAndDecodeIDNs( const TQString & str )
{
//  kdDebug() << "KPIM::normalizeAddressesAndDecodeIDNs( \""
//                << str << "\" )" << endl;
  if( str.isEmpty() )
    return str;

  const TQStringList addressList = KPIM::splitEmailAddrList( str );
  TQStringList normalizedAddressList;

  TQCString displayName, addrSpec, comment;

  for( TQStringList::ConstIterator it = addressList.begin();
       ( it != addressList.end() );
       ++it ) {
    if( !(*it).isEmpty() ) {
      if ( KPIM::splitAddress( (*it).utf8(), displayName, addrSpec, comment )
           == AddressOk ) {

        displayName = KMime::decodeRFC2047String(displayName).utf8();
        comment = KMime::decodeRFC2047String(comment).utf8();

        normalizedAddressList <<
          normalizedAddress( TQString::fromUtf8( displayName ),
                             decodeIDN( TQString::fromUtf8( addrSpec ) ),
                             TQString::fromUtf8( comment ) );
      }
      else {
        kdDebug() << "splitting address failed: " << *it << endl;
      }
    }
  }
/*
  kdDebug() << "normalizedAddressList: \""
                << normalizedAddressList.join( ", " )
                << "\"" << endl;
*/
  return normalizedAddressList.join( ", " );
}

//-----------------------------------------------------------------------------
TQString KPIM::normalizeAddressesAndEncodeIDNs( const TQString & str )
{
  //kdDebug() << "KPIM::normalizeAddressesAndEncodeIDNs( \""
  //              << str << "\" )" << endl;
  if( str.isEmpty() )
    return str;

  const TQStringList addressList = KPIM::splitEmailAddrList( str );
  TQStringList normalizedAddressList;

  TQCString displayName, addrSpec, comment;

  for( TQStringList::ConstIterator it = addressList.begin();
       ( it != addressList.end() );
       ++it ) {
    if( !(*it).isEmpty() ) {
      if ( KPIM::splitAddress( (*it).utf8(), displayName, addrSpec, comment )
           == AddressOk ) {

        normalizedAddressList <<
          normalizedAddress( TQString::fromUtf8( displayName ),
                             encodeIDN( TQString::fromUtf8( addrSpec ) ),
                             TQString::fromUtf8( comment ) );
      }
      else {
        kdDebug() << "splitting address failed: " << *it << endl;
      }
    }
  }

  /*
  kdDebug() << "normalizedAddressList: \""
                << normalizedAddressList.join( ", " )
                << "\"" << endl;
  */
  return normalizedAddressList.join( ", " );
}


//-----------------------------------------------------------------------------
// Escapes unescaped doublequotes in str.
static TQString escapeQuotes( const TQString & str )
{
  if ( str.isEmpty() )
    return TQString();

  TQString escaped;
  // reserve enough memory for the worst case ( """..."" -> \"\"\"...\"\" )
  escaped.reserve( 2*str.length() );
  unsigned int len = 0;
  for ( unsigned int i = 0; i < str.length(); ++i, ++len ) {
    if ( str[i] == '"' ) { // unescaped doublequote
      escaped[len] = '\\';
      ++len;
    }
    else if ( str[i] == '\\' ) { // escaped character
      escaped[len] = '\\';
      ++len;
      ++i;
      if ( i >= str.length() ) // handle trailing '\' gracefully
        break;
    }
    escaped[len] = str[i];
  }
  escaped.truncate( len );
  return escaped;
}

//-----------------------------------------------------------------------------
TQString KPIM::quoteNameIfNecessary( const TQString &str )
{
  TQString quoted = str;

  TQRegExp needQuotes(  "[^ 0-9A-Za-z\\x0080-\\xFFFF]" );
  // avoid double quoting
  if ( ( quoted[0] == '"' ) && ( quoted[quoted.length() - 1] == '"' ) ) {
    quoted = "\"" + escapeQuotes( quoted.mid( 1, quoted.length() - 2 ) ) + "\"";
  }
  else if ( quoted.find( needQuotes ) != -1 ) {
    quoted = "\"" + escapeQuotes( quoted ) + "\"";
  }

  return quoted;
}