src/html/htmlpars.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        htmlpars.cpp
   3 // Purpose:     wxHtmlParser class (generic parser)
   4 // Author:      Vaclav Slavik
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 1999 Vaclav Slavik
   7 // Licence:     wxWindows Licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10
  11 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  12 #pragma implementation "htmlpars.h"
  13 #endif
  14
  15 #include "wx/wxprec.h"
  16
  17 #include "wx/defs.h"
  18 #if wxUSE_HTML && wxUSE_STREAMS
  19
  20 #ifdef __BORLANDC__
  21 #pragma hdrstop
  22 #endif
  23
  24 #ifndef WXPRECOMP
  25     #include "wx/log.h"
  26     #include "wx/intl.h"
  27 #endif
  28
  29 #include "wx/tokenzr.h"
  30 #include "wx/wfstream.h"
  31 #include "wx/url.h"
  32 #include "wx/fontmap.h"
  33 #include "wx/html/htmldefs.h"
  34 #include "wx/html/htmlpars.h"
  35 #include "wx/dynarray.h"
  36 #include "wx/arrimpl.cpp"
  37
  38 #ifdef __WXWINCE__
  39     #include "wx/msw/wince/missing.h"       // for bsearch()
  40 #endif
  41
  42 // DLL options compatibility check:
  43 #include "wx/app.h"
  44 WX_CHECK_BUILD_OPTIONS("wxHTML")
  45
  46 //-----------------------------------------------------------------------------
  47 // wxHtmlParser helpers
  48 //-----------------------------------------------------------------------------
  49
  50 class wxHtmlTextPiece
  51 {
  52 public:
  53     wxHtmlTextPiece(int pos, int lng) : m_pos(pos), m_lng(lng) {}
  54     int m_pos, m_lng;
  55 };
  56
  57 WX_DECLARE_OBJARRAY(wxHtmlTextPiece, wxHtmlTextPieces);
  58 WX_DEFINE_OBJARRAY(wxHtmlTextPieces);
  59
  60 class wxHtmlParserState
  61 {
  62 public:
  63     wxHtmlTag         *m_curTag;
  64     wxHtmlTag         *m_tags;
  65     wxHtmlTextPieces  *m_textPieces;
  66     int                m_curTextPiece;
  67     wxString           m_source;
  68     wxHtmlParserState *m_nextState;
  69 };
  70
  71 //-----------------------------------------------------------------------------
  72 // wxHtmlParser
  73 //-----------------------------------------------------------------------------
  74
  75 IMPLEMENT_ABSTRACT_CLASS(wxHtmlParser,wxObject)
  76
  77 wxHtmlParser::wxHtmlParser()
  78     : wxObject(), m_HandlersHash(wxKEY_STRING),
  79       m_FS(NULL), m_HandlersStack(NULL)
  80 {
  81     m_entitiesParser = new wxHtmlEntitiesParser;
  82     m_Tags = NULL;
  83     m_CurTag = NULL;
  84     m_TextPieces = NULL;
  85     m_CurTextPiece = 0;
  86     m_SavedStates = NULL;
  87 }
  88
  89 wxHtmlParser::~wxHtmlParser()
  90 {
  91     while (RestoreState()) {}
  92     DestroyDOMTree();
  93
  94     if (m_HandlersStack)
  95     {
  96         wxList& tmp = *m_HandlersStack;
  97         wxList::iterator it, en;
  98         for( it = tmp.begin(), en = tmp.end(); it != en; ++it )
  99             delete (wxHashTable*)*it;
 100         tmp.clear();
 101     }
 102     delete m_HandlersStack;
 103     m_HandlersHash.Clear();
 104     WX_CLEAR_LIST(wxList, m_HandlersList);
 105     delete m_entitiesParser;
 106 }
 107
 108 wxObject* wxHtmlParser::Parse(const wxString& source)
 109 {
 110     InitParser(source);
 111     DoParsing();
 112     wxObject *result = GetProduct();
 113     DoneParser();
 114     return result;
 115 }
 116
 117 void wxHtmlParser::InitParser(const wxString& source)
 118 {
 119     SetSource(source);
 120     m_stopParsing = FALSE;
 121 }
 122
 123 void wxHtmlParser::DoneParser()
 124 {
 125     DestroyDOMTree();
 126 }
 127
 128 void wxHtmlParser::SetSource(const wxString& src)
 129 {
 130     DestroyDOMTree();
 131     m_Source = src;
 132     CreateDOMTree();
 133     m_CurTag = NULL;
 134     m_CurTextPiece = 0;
 135 }
 136
 137 void wxHtmlParser::CreateDOMTree()
 138 {
 139     wxHtmlTagsCache cache(m_Source);
 140     m_TextPieces = new wxHtmlTextPieces;
 141     CreateDOMSubTree(NULL, 0, m_Source.Length(), &cache);
 142     m_CurTextPiece = 0;
 143 }
 144
 145 extern bool wxIsCDATAElement(const wxChar *tag);
 146
 147 void wxHtmlParser::CreateDOMSubTree(wxHtmlTag *cur,
 148                                     int begin_pos, int end_pos,
 149                                     wxHtmlTagsCache *cache)
 150 {
 151     if (end_pos <= begin_pos) return;
 152
 153     wxChar c;
 154     int i = begin_pos;
 155     int textBeginning = begin_pos;
 156
 157     // If the tag contains CDATA text, we include the text between beginning
 158     // and ending tag verbosely. Setting i=end_pos will skip to the very
 159     // end of this function where text piece is added, bypassing any child
 160     // tags parsing (CDATA element can't have child elements by definition):
 161     if (cur != NULL && wxIsCDATAElement(cur->GetName().c_str()))
 162     {
 163         i = end_pos;
 164     }
 165
 166     while (i < end_pos)
 167     {
 168         c = m_Source.GetChar(i);
 169
 170         if (c == wxT('<'))
 171         {
 172             // add text to m_TextPieces:
 173             if (i - textBeginning > 0)
 174                 m_TextPieces->Add(
 175                     wxHtmlTextPiece(textBeginning, i - textBeginning));
 176
 177             // if it is a comment, skip it:
 178             if (i < end_pos-6 && m_Source.GetChar(i+1) == wxT('!') &&
 179                                  m_Source.GetChar(i+2) == wxT('-') &&
 180                                  m_Source.GetChar(i+3) == wxT('-'))
 181             {
 182                 // Comments begin with "<!--" and end with "--[ \t\r\n]*>"
 183                 // according to HTML 4.0
 184                 int dashes = 0;
 185                 i += 4;
 186                 while (i < end_pos)
 187                 {
 188                     c = m_Source.GetChar(i++);
 189                     if ((c == wxT(' ') || c == wxT('\n') ||
 190                         c == wxT('\r') || c == wxT('\t')) && dashes >= 2) {}
 191                     else if (c == wxT('>') && dashes >= 2)
 192                     {
 193                         textBeginning = i;
 194                         break;
 195                     }
 196                     else if (c == wxT('-'))
 197                         dashes++;
 198                     else
 199                         dashes = 0;
 200                 }
 201             }
 202
 203             // add another tag to the tree:
 204             else if (i < end_pos-1 && m_Source.GetChar(i+1) != wxT('/'))
 205                 {
 206                 wxHtmlTag *chd;
 207                 if (cur)
 208                     chd = new wxHtmlTag(cur, m_Source,
 209                                         i, end_pos, cache, m_entitiesParser);
 210                 else
 211                 {
 212                     chd = new wxHtmlTag(NULL, m_Source,
 213                                         i, end_pos, cache, m_entitiesParser);
 214                     if (!m_Tags)
 215                     {
 216                         // if this is the first tag to be created make the root
 217                         // m_Tags point to it:
 218                         m_Tags = chd;
 219                     }
 220                     else
 221                     {
 222                         // if there is already a root tag add this tag as
 223                         // the last sibling:
 224                         chd->m_Prev = m_Tags->GetLastSibling();
 225                         chd->m_Prev->m_Next = chd;
 226                     }
 227                 }
 228
 229                 if (chd->HasEnding())
 230                 {
 231                     CreateDOMSubTree(chd,
 232                                      chd->GetBeginPos(), chd->GetEndPos1(),
 233                                      cache);
 234                     i = chd->GetEndPos2();
 235                 }
 236                 else
 237                     i = chd->GetBeginPos();
 238
 239                 textBeginning = i;
 240             }
 241
 242             // ... or skip ending tag:
 243             else
 244             {
 245                 while (i < end_pos && m_Source.GetChar(i) != wxT('>')) i++;
 246                 textBeginning = i+1;
 247             }
 248         }
 249         else i++;
 250     }
 251
 252     // add remaining text to m_TextPieces:
 253     if (end_pos - textBeginning > 0)
 254         m_TextPieces->Add(
 255             wxHtmlTextPiece(textBeginning, end_pos - textBeginning));
 256 }
 257
 258 void wxHtmlParser::DestroyDOMTree()
 259 {
 260     wxHtmlTag *t1, *t2;
 261     t1 = m_Tags;
 262     while (t1)
 263     {
 264         t2 = t1->GetNextSibling();
 265         delete t1;
 266         t1 = t2;
 267     }
 268     m_Tags = m_CurTag = NULL;
 269
 270     delete m_TextPieces;
 271     m_TextPieces = NULL;
 272 }
 273
 274 void wxHtmlParser::DoParsing()
 275 {
 276     m_CurTag = m_Tags;
 277     m_CurTextPiece = 0;
 278     DoParsing(0, m_Source.Length());
 279 }
 280
 281 void wxHtmlParser::DoParsing(int begin_pos, int end_pos)
 282 {
 283     if (end_pos <= begin_pos) return;
 284
 285     wxHtmlTextPieces& pieces = *m_TextPieces;
 286     size_t piecesCnt = pieces.GetCount();
 287
 288     while (begin_pos < end_pos)
 289     {
 290         while (m_CurTag && m_CurTag->GetBeginPos() < begin_pos)
 291             m_CurTag = m_CurTag->GetNextTag();
 292         while (m_CurTextPiece < piecesCnt &&
 293                pieces[m_CurTextPiece].m_pos < begin_pos)
 294             m_CurTextPiece++;
 295
 296         if (m_CurTextPiece < piecesCnt &&
 297             (!m_CurTag ||
 298              pieces[m_CurTextPiece].m_pos < m_CurTag->GetBeginPos()))
 299         {
 300             // Add text:
 301             AddText(GetEntitiesParser()->Parse(
 302                        m_Source.Mid(pieces[m_CurTextPiece].m_pos,
 303                                     pieces[m_CurTextPiece].m_lng)));
 304             begin_pos = pieces[m_CurTextPiece].m_pos +
 305                         pieces[m_CurTextPiece].m_lng;
 306             m_CurTextPiece++;
 307         }
 308         else if (m_CurTag)
 309         {
 310             // Add tag:
 311             if (m_CurTag)
 312             {
 313                 if (m_CurTag->HasEnding())
 314                     begin_pos = m_CurTag->GetEndPos2();
 315                 else
 316                     begin_pos = m_CurTag->GetBeginPos();
 317             }
 318             wxHtmlTag *t = m_CurTag;
 319             m_CurTag = m_CurTag->GetNextTag();
 320             AddTag(*t);
 321             if (m_stopParsing)
 322                 return;
 323         }
 324         else break;
 325     }
 326 }
 327
 328 void wxHtmlParser::AddTag(const wxHtmlTag& tag)
 329 {
 330     wxHtmlTagHandler *h;
 331     bool inner = FALSE;
 332
 333     h = (wxHtmlTagHandler*) m_HandlersHash.Get(tag.GetName());
 334     if (h)
 335     {
 336         inner = h->HandleTag(tag);
 337         if (m_stopParsing)
 338             return;
 339     }
 340     if (!inner)
 341     {
 342         if (tag.HasEnding())
 343             DoParsing(tag.GetBeginPos(), tag.GetEndPos1());
 344     }
 345 }
 346
 347 void wxHtmlParser::AddTagHandler(wxHtmlTagHandler *handler)
 348 {
 349     wxString s(handler->GetSupportedTags());
 350     wxStringTokenizer tokenizer(s, wxT(", "));
 351
 352     while (tokenizer.HasMoreTokens())
 353         m_HandlersHash.Put(tokenizer.GetNextToken(), handler);
 354
 355     if (m_HandlersList.IndexOf(handler) == wxNOT_FOUND)
 356         m_HandlersList.Append(handler);
 357
 358     handler->SetParser(this);
 359 }
 360
 361 void wxHtmlParser::PushTagHandler(wxHtmlTagHandler *handler, wxString tags)
 362 {
 363     wxStringTokenizer tokenizer(tags, wxT(", "));
 364     wxString key;
 365
 366     if (m_HandlersStack == NULL)
 367     {
 368         m_HandlersStack = new wxList;
 369     }
 370
 371     m_HandlersStack->Insert((wxObject*)new wxHashTable(m_HandlersHash));
 372
 373     while (tokenizer.HasMoreTokens())
 374     {
 375         key = tokenizer.GetNextToken();
 376         m_HandlersHash.Delete(key);
 377         m_HandlersHash.Put(key, handler);
 378     }
 379 }
 380
 381 void wxHtmlParser::PopTagHandler()
 382 {
 383     wxList::compatibility_iterator first;
 384
 385     if ( !m_HandlersStack ||
 386 #if wxUSE_STL
 387          !(first = m_HandlersStack->GetFirst())
 388 #else // !wxUSE_STL
 389          ((first = m_HandlersStack->GetFirst()) == NULL)
 390 #endif // wxUSE_STL/!wxUSE_STL
 391         )
 392     {
 393         wxLogWarning(_("Warning: attempt to remove HTML tag handler from empty stack."));
 394         return;
 395     }
 396     m_HandlersHash = *((wxHashTable*) first->GetData());
 397     delete (wxHashTable*) first->GetData();
 398     m_HandlersStack->Erase(first);
 399 }
 400
 401 void wxHtmlParser::SetSourceAndSaveState(const wxString& src)
 402 {
 403     wxHtmlParserState *s = new wxHtmlParserState;
 404
 405     s->m_curTag = m_CurTag;
 406     s->m_tags = m_Tags;
 407     s->m_textPieces = m_TextPieces;
 408     s->m_curTextPiece = m_CurTextPiece;
 409     s->m_source = m_Source;
 410
 411     s->m_nextState = m_SavedStates;
 412     m_SavedStates = s;
 413
 414     m_CurTag = NULL;
 415     m_Tags = NULL;
 416     m_TextPieces = NULL;
 417     m_CurTextPiece = 0;
 418     m_Source = wxEmptyString;
 419
 420     SetSource(src);
 421 }
 422
 423 bool wxHtmlParser::RestoreState()
 424 {
 425     if (!m_SavedStates) return FALSE;
 426
 427     DestroyDOMTree();
 428
 429     wxHtmlParserState *s = m_SavedStates;
 430     m_SavedStates = s->m_nextState;
 431
 432     m_CurTag = s->m_curTag;
 433     m_Tags = s->m_tags;
 434     m_TextPieces = s->m_textPieces;
 435     m_CurTextPiece = s->m_curTextPiece;
 436     m_Source = s->m_source;
 437
 438     delete s;
 439     return TRUE;
 440 }
 441
 442 //-----------------------------------------------------------------------------
 443 // wxHtmlTagHandler
 444 //-----------------------------------------------------------------------------
 445
 446 IMPLEMENT_ABSTRACT_CLASS(wxHtmlTagHandler,wxObject)
 447
 448
 449 //-----------------------------------------------------------------------------
 450 // wxHtmlEntitiesParser
 451 //-----------------------------------------------------------------------------
 452
 453 IMPLEMENT_DYNAMIC_CLASS(wxHtmlEntitiesParser,wxObject)
 454
 455 wxHtmlEntitiesParser::wxHtmlEntitiesParser()
 456 #if wxUSE_WCHAR_T && !wxUSE_UNICODE
 457     : m_conv(NULL), m_encoding(wxFONTENCODING_SYSTEM)
 458 #endif
 459 {
 460 }
 461
 462 wxHtmlEntitiesParser::~wxHtmlEntitiesParser()
 463 {
 464 #if wxUSE_WCHAR_T && !wxUSE_UNICODE
 465     delete m_conv;
 466 #endif
 467 }
 468
 469 void wxHtmlEntitiesParser::SetEncoding(wxFontEncoding encoding)
 470 {
 471 #if wxUSE_WCHAR_T && !wxUSE_UNICODE
 472     if (encoding == m_encoding)
 473         return;
 474
 475     delete m_conv;
 476
 477     m_encoding = encoding;
 478     if (m_encoding == wxFONTENCODING_SYSTEM)
 479         m_conv = NULL;
 480     else
 481         m_conv = new wxCSConv(wxFontMapper::GetEncodingName(m_encoding));
 482 #else
 483     (void) encoding;
 484 #endif
 485 }
 486
 487 wxString wxHtmlEntitiesParser::Parse(const wxString& input)
 488 {
 489     const wxChar *c, *last;
 490     const wxChar *in_str = input.c_str();
 491     wxString output;
 492
 493     output.reserve(input.length());
 494
 495     for (c = in_str, last = in_str; *c != wxT('\0'); c++)
 496     {
 497         if (*c == wxT('&'))
 498         {
 499             if (c - last > 0)
 500                 output.append(last, c - last);
 501             if (++c == wxT('\0')) break;
 502
 503             wxString entity;
 504             const wxChar *ent_s = c;
 505             wxChar entity_char;
 506
 507             for (; (*c >= wxT('a') && *c <= wxT('z')) ||
 508                    (*c >= wxT('A') && *c <= wxT('Z')) ||
 509                    (*c >= wxT('0') && *c <= wxT('9')) ||
 510                    *c == wxT('_') || *c == wxT('#'); c++) {}
 511             entity.append(ent_s, c - ent_s);
 512             if (*c != wxT(';')) c--;
 513             last = c+1;
 514             entity_char = GetEntityChar(entity);
 515             if (entity_char)
 516                 output << entity_char;
 517             else
 518             {
 519                 output.append(ent_s-1, c-ent_s+2);
 520                 wxLogDebug(wxT("Unrecognized HTML entity: '%s'"), entity.c_str());
 521             }
 522         }
 523     }
 524     if (*last != wxT('\0'))
 525         output.append(last);
 526     return output;
 527 }
 528
 529 struct wxHtmlEntityInfo
 530 {
 531     const wxChar *name;
 532     unsigned code;
 533 };
 534
 535 extern "C" int LINKAGEMODE wxHtmlEntityCompare(const void *key, const void *item)
 536 {
 537     return wxStrcmp((wxChar*)key, ((wxHtmlEntityInfo*)item)->name);
 538 }
 539
 540 #if !wxUSE_UNICODE
 541 wxChar wxHtmlEntitiesParser::GetCharForCode(unsigned code)
 542 {
 543 #if wxUSE_WCHAR_T
 544     char buf[2];
 545     wchar_t wbuf[2];
 546     wbuf[0] = (wchar_t)code;
 547     wbuf[1] = 0;
 548     wxMBConv *conv = m_conv ? m_conv : &wxConvLocal;
 549     if (conv->WC2MB(buf, wbuf, 2) == (size_t)-1)
 550         return '?';
 551     return buf[0];
 552 #else
 553     return (code < 256) ? (wxChar)code : '?';
 554 #endif
 555 }
 556 #endif
 557
 558 wxChar wxHtmlEntitiesParser::GetEntityChar(const wxString& entity)
 559 {
 560     unsigned code = 0;
 561
 562     if (entity[0] == wxT('#'))
 563     {
 564         const wxChar *ent_s = entity.c_str();
 565         const wxChar *format;
 566
 567         if (ent_s[1] == wxT('x') || ent_s[1] == wxT('X'))
 568         {
 569             format = wxT("%x");
 570             ent_s++;
 571         }
 572         else
 573             format = wxT("%u");
 574         ent_s++;
 575
 576         if (wxSscanf(ent_s, format, &code) != 1)
 577             code = 0;
 578     }
 579     else
 580     {
 581         static wxHtmlEntityInfo substitutions[] = {
 582             { wxT("AElig"),198 },
 583             { wxT("Aacute"),193 },
 584             { wxT("Acirc"),194 },
 585             { wxT("Agrave"),192 },
 586             { wxT("Alpha"),913 },
 587             { wxT("Aring"),197 },
 588             { wxT("Atilde"),195 },
 589             { wxT("Auml"),196 },
 590             { wxT("Beta"),914 },
 591             { wxT("Ccedil"),199 },
 592             { wxT("Chi"),935 },
 593             { wxT("Dagger"),8225 },
 594             { wxT("Delta"),916 },
 595             { wxT("ETH"),208 },
 596             { wxT("Eacute"),201 },
 597             { wxT("Ecirc"),202 },
 598             { wxT("Egrave"),200 },
 599             { wxT("Epsilon"),917 },
 600             { wxT("Eta"),919 },
 601             { wxT("Euml"),203 },
 602             { wxT("Gamma"),915 },
 603             { wxT("Iacute"),205 },
 604             { wxT("Icirc"),206 },
 605             { wxT("Igrave"),204 },
 606             { wxT("Iota"),921 },
 607             { wxT("Iuml"),207 },
 608             { wxT("Kappa"),922 },
 609             { wxT("Lambda"),923 },
 610             { wxT("Mu"),924 },
 611             { wxT("Ntilde"),209 },
 612             { wxT("Nu"),925 },
 613             { wxT("OElig"),338 },
 614             { wxT("Oacute"),211 },
 615             { wxT("Ocirc"),212 },
 616             { wxT("Ograve"),210 },
 617             { wxT("Omega"),937 },
 618             { wxT("Omicron"),927 },
 619             { wxT("Oslash"),216 },
 620             { wxT("Otilde"),213 },
 621             { wxT("Ouml"),214 },
 622             { wxT("Phi"),934 },
 623             { wxT("Pi"),928 },
 624             { wxT("Prime"),8243 },
 625             { wxT("Psi"),936 },
 626             { wxT("Rho"),929 },
 627             { wxT("Scaron"),352 },
 628             { wxT("Sigma"),931 },
 629             { wxT("THORN"),222 },
 630             { wxT("Tau"),932 },
 631             { wxT("Theta"),920 },
 632             { wxT("Uacute"),218 },
 633             { wxT("Ucirc"),219 },
 634             { wxT("Ugrave"),217 },
 635             { wxT("Upsilon"),933 },
 636             { wxT("Uuml"),220 },
 637             { wxT("Xi"),926 },
 638             { wxT("Yacute"),221 },
 639             { wxT("Yuml"),376 },
 640             { wxT("Zeta"),918 },
 641             { wxT("aacute"),225 },
 642             { wxT("acirc"),226 },
 643             { wxT("acute"),180 },
 644             { wxT("aelig"),230 },
 645             { wxT("agrave"),224 },
 646             { wxT("alefsym"),8501 },
 647             { wxT("alpha"),945 },
 648             { wxT("amp"),38 },
 649             { wxT("and"),8743 },
 650             { wxT("ang"),8736 },
 651             { wxT("aring"),229 },
 652             { wxT("asymp"),8776 },
 653             { wxT("atilde"),227 },
 654             { wxT("auml"),228 },
 655             { wxT("bdquo"),8222 },
 656             { wxT("beta"),946 },
 657             { wxT("brvbar"),166 },
 658             { wxT("bull"),8226 },
 659             { wxT("cap"),8745 },
 660             { wxT("ccedil"),231 },
 661             { wxT("cedil"),184 },
 662             { wxT("cent"),162 },
 663             { wxT("chi"),967 },
 664             { wxT("circ"),710 },
 665             { wxT("clubs"),9827 },
 666             { wxT("cong"),8773 },
 667             { wxT("copy"),169 },
 668             { wxT("crarr"),8629 },
 669             { wxT("cup"),8746 },
 670             { wxT("curren"),164 },
 671             { wxT("dArr"),8659 },
 672             { wxT("dagger"),8224 },
 673             { wxT("darr"),8595 },
 674             { wxT("deg"),176 },
 675             { wxT("delta"),948 },
 676             { wxT("diams"),9830 },
 677             { wxT("divide"),247 },
 678             { wxT("eacute"),233 },
 679             { wxT("ecirc"),234 },
 680             { wxT("egrave"),232 },
 681             { wxT("empty"),8709 },
 682             { wxT("emsp"),8195 },
 683             { wxT("ensp"),8194 },
 684             { wxT("epsilon"),949 },
 685             { wxT("equiv"),8801 },
 686             { wxT("eta"),951 },
 687             { wxT("eth"),240 },
 688             { wxT("euml"),235 },
 689             { wxT("euro"),8364 },
 690             { wxT("exist"),8707 },
 691             { wxT("fnof"),402 },
 692             { wxT("forall"),8704 },
 693             { wxT("frac12"),189 },
 694             { wxT("frac14"),188 },
 695             { wxT("frac34"),190 },
 696             { wxT("frasl"),8260 },
 697             { wxT("gamma"),947 },
 698             { wxT("ge"),8805 },
 699             { wxT("gt"),62 },
 700             { wxT("hArr"),8660 },
 701             { wxT("harr"),8596 },
 702             { wxT("hearts"),9829 },
 703             { wxT("hellip"),8230 },
 704             { wxT("iacute"),237 },
 705             { wxT("icirc"),238 },
 706             { wxT("iexcl"),161 },
 707             { wxT("igrave"),236 },
 708             { wxT("image"),8465 },
 709             { wxT("infin"),8734 },
 710             { wxT("int"),8747 },
 711             { wxT("iota"),953 },
 712             { wxT("iquest"),191 },
 713             { wxT("isin"),8712 },
 714             { wxT("iuml"),239 },
 715             { wxT("kappa"),954 },
 716             { wxT("lArr"),8656 },
 717             { wxT("lambda"),955 },
 718             { wxT("lang"),9001 },
 719             { wxT("laquo"),171 },
 720             { wxT("larr"),8592 },
 721             { wxT("lceil"),8968 },
 722             { wxT("ldquo"),8220 },
 723             { wxT("le"),8804 },
 724             { wxT("lfloor"),8970 },
 725             { wxT("lowast"),8727 },
 726             { wxT("loz"),9674 },
 727             { wxT("lrm"),8206 },
 728             { wxT("lsaquo"),8249 },
 729             { wxT("lsquo"),8216 },
 730             { wxT("lt"),60 },
 731             { wxT("macr"),175 },
 732             { wxT("mdash"),8212 },
 733             { wxT("micro"),181 },
 734             { wxT("middot"),183 },
 735             { wxT("minus"),8722 },
 736             { wxT("mu"),956 },
 737             { wxT("nabla"),8711 },
 738             { wxT("nbsp"),160 },
 739             { wxT("ndash"),8211 },
 740             { wxT("ne"),8800 },
 741             { wxT("ni"),8715 },
 742             { wxT("not"),172 },
 743             { wxT("notin"),8713 },
 744             { wxT("nsub"),8836 },
 745             { wxT("ntilde"),241 },
 746             { wxT("nu"),957 },
 747             { wxT("oacute"),243 },
 748             { wxT("ocirc"),244 },
 749             { wxT("oelig"),339 },
 750             { wxT("ograve"),242 },
 751             { wxT("oline"),8254 },
 752             { wxT("omega"),969 },
 753             { wxT("omicron"),959 },
 754             { wxT("oplus"),8853 },
 755             { wxT("or"),8744 },
 756             { wxT("ordf"),170 },
 757             { wxT("ordm"),186 },
 758             { wxT("oslash"),248 },
 759             { wxT("otilde"),245 },
 760             { wxT("otimes"),8855 },
 761             { wxT("ouml"),246 },
 762             { wxT("para"),182 },
 763             { wxT("part"),8706 },
 764             { wxT("permil"),8240 },
 765             { wxT("perp"),8869 },
 766             { wxT("phi"),966 },
 767             { wxT("pi"),960 },
 768             { wxT("piv"),982 },
 769             { wxT("plusmn"),177 },
 770             { wxT("pound"),163 },
 771             { wxT("prime"),8242 },
 772             { wxT("prod"),8719 },
 773             { wxT("prop"),8733 },
 774             { wxT("psi"),968 },
 775             { wxT("quot"),34 },
 776             { wxT("rArr"),8658 },
 777             { wxT("radic"),8730 },
 778             { wxT("rang"),9002 },
 779             { wxT("raquo"),187 },
 780             { wxT("rarr"),8594 },
 781             { wxT("rceil"),8969 },
 782             { wxT("rdquo"),8221 },
 783             { wxT("real"),8476 },
 784             { wxT("reg"),174 },
 785             { wxT("rfloor"),8971 },
 786             { wxT("rho"),961 },
 787             { wxT("rlm"),8207 },
 788             { wxT("rsaquo"),8250 },
 789             { wxT("rsquo"),8217 },
 790             { wxT("sbquo"),8218 },
 791             { wxT("scaron"),353 },
 792             { wxT("sdot"),8901 },
 793             { wxT("sect"),167 },
 794             { wxT("shy"),173 },
 795             { wxT("sigma"),963 },
 796             { wxT("sigmaf"),962 },
 797             { wxT("sim"),8764 },
 798             { wxT("spades"),9824 },
 799             { wxT("sub"),8834 },
 800             { wxT("sube"),8838 },
 801             { wxT("sum"),8721 },
 802             { wxT("sup"),8835 },
 803             { wxT("sup1"),185 },
 804             { wxT("sup2"),178 },
 805             { wxT("sup3"),179 },
 806             { wxT("supe"),8839 },
 807             { wxT("szlig"),223 },
 808             { wxT("tau"),964 },
 809             { wxT("there4"),8756 },
 810             { wxT("theta"),952 },
 811             { wxT("thetasym"),977 },
 812             { wxT("thinsp"),8201 },
 813             { wxT("thorn"),254 },
 814             { wxT("tilde"),732 },
 815             { wxT("times"),215 },
 816             { wxT("trade"),8482 },
 817             { wxT("uArr"),8657 },
 818             { wxT("uacute"),250 },
 819             { wxT("uarr"),8593 },
 820             { wxT("ucirc"),251 },
 821             { wxT("ugrave"),249 },
 822             { wxT("uml"),168 },
 823             { wxT("upsih"),978 },
 824             { wxT("upsilon"),965 },
 825             { wxT("uuml"),252 },
 826             { wxT("weierp"),8472 },
 827             { wxT("xi"),958 },
 828             { wxT("yacute"),253 },
 829             { wxT("yen"),165 },
 830             { wxT("yuml"),255 },
 831             { wxT("zeta"),950 },
 832             { wxT("zwj"),8205 },
 833             { wxT("zwnj"),8204 },
 834             {NULL, 0}};
 835         static size_t substitutions_cnt = 0;
 836
 837         if (substitutions_cnt == 0)
 838             while (substitutions[substitutions_cnt].code != 0)
 839                 substitutions_cnt++;
 840
 841         wxHtmlEntityInfo *info;
 842         info = (wxHtmlEntityInfo*) bsearch(entity.c_str(), substitutions,
 843                                            substitutions_cnt,
 844                                            sizeof(wxHtmlEntityInfo),
 845                                            wxHtmlEntityCompare);
 846         if (info)
 847             code = info->code;
 848     }
 849
 850     if (code == 0)
 851         return 0;
 852     else
 853         return GetCharForCode(code);
 854 }
 855
 856 wxFSFile *wxHtmlParser::OpenURL(wxHtmlURLType WXUNUSED(type),
 857                                 const wxString& url) const
 858 {
 859     return m_FS ? m_FS->OpenFile(url) : NULL;
 860
 861 }
 862
 863
 864 //-----------------------------------------------------------------------------
 865 // wxHtmlParser::ExtractCharsetInformation
 866 //-----------------------------------------------------------------------------
 867
 868 class wxMetaTagParser : public wxHtmlParser
 869 {
 870 public:
 871     wxMetaTagParser() { }
 872
 873     wxObject* GetProduct() { return NULL; }
 874
 875 protected:
 876     virtual void AddText(const wxChar* WXUNUSED(txt)) {}
 877
 878     DECLARE_NO_COPY_CLASS(wxMetaTagParser)
 879 };
 880
 881 class wxMetaTagHandler : public wxHtmlTagHandler
 882 {
 883 public:
 884     wxMetaTagHandler(wxString *retval) : wxHtmlTagHandler(), m_retval(retval) {}
 885     wxString GetSupportedTags() { return wxT("META,BODY"); }
 886     bool HandleTag(const wxHtmlTag& tag);
 887
 888 private:
 889     wxString *m_retval;
 890
 891     DECLARE_NO_COPY_CLASS(wxMetaTagHandler)
 892 };
 893
 894 bool wxMetaTagHandler::HandleTag(const wxHtmlTag& tag)
 895 {
 896     if (tag.GetName() == _T("BODY"))
 897     {
 898         m_Parser->StopParsing();
 899         return FALSE;
 900     }
 901
 902     if (tag.HasParam(_T("HTTP-EQUIV")) &&
 903         tag.GetParam(_T("HTTP-EQUIV")).IsSameAs(_T("Content-Type"), false) &&
 904         tag.HasParam(_T("CONTENT")))
 905     {
 906         wxString content = tag.GetParam(_T("CONTENT")).Lower();
 907         if (content.Left(19) == _T("text/html; charset="))
 908         {
 909             *m_retval = content.Mid(19);
 910             m_Parser->StopParsing();
 911         }
 912     }
 913     return FALSE;
 914 }
 915
 916
 917 /*static*/
 918 wxString wxHtmlParser::ExtractCharsetInformation(const wxString& markup)
 919 {
 920     wxString charset;
 921     wxMetaTagParser parser;
 922     parser.AddTagHandler(new wxMetaTagHandler(&charset));
 923     parser.Parse(markup);
 924     return charset;
 925 }
 926
 927 #endif