src/html/htmltag.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        htmltag.cpp
   3 // Purpose:     wxHtmlTag class (represents single tag)
   4 // Author:      Vaclav Slavik
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 1999 Vaclav Slavik
   7 // Licence:     wxWindows Licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10
  11 #ifdef __GNUG__
  12 #pragma implementation
  13 #endif
  14
  15 #include "wx/wxprec.h"
  16
  17 #include "wx/defs.h"
  18 #if wxUSE_HTML
  19
  20 #ifdef __BORDLANDC__
  21 #pragma hdrstop
  22 #endif
  23
  24 #ifndef WXPRECOMP
  25 #endif
  26
  27 #include "wx/html/htmltag.h"
  28 #include "wx/html/htmlpars.h"
  29 #include <stdio.h> // for vsscanf
  30 #include <stdarg.h>
  31
  32
  33 //-----------------------------------------------------------------------------
  34 // wxHtmlTagsCache
  35 //-----------------------------------------------------------------------------
  36
  37 struct wxHtmlCacheItem
  38 {
  39     // this is "pos" value passed to wxHtmlTag's constructor.
  40     // it is position of '<' character of the tag
  41     int Key;
  42
  43     // end positions for the tag:
  44     // end1 is '<' of ending tag,
  45     // end2 is '>' or both are
  46     // -1 if there is no ending tag for this one...
  47     // or -2 if this is ending tag  </...>
  48     int End1, End2;
  49
  50     // name of this tag
  51     wxChar *Name;
  52 };
  53
  54
  55 IMPLEMENT_CLASS(wxHtmlTagsCache,wxObject)
  56
  57 #define CACHE_INCREMENT  64
  58
  59 wxHtmlTagsCache::wxHtmlTagsCache(const wxString& source)
  60 {
  61     const wxChar *src = source.c_str();
  62     int i, tg, pos, stpos;
  63     int lng = source.Length();
  64     wxChar dummy[256];
  65
  66     m_Cache = NULL;
  67     m_CacheSize = 0;
  68     m_CachePos = 0;
  69
  70     pos = 0;
  71     while (pos < lng)
  72     {
  73         if (src[pos] == wxT('<'))   // tag found:
  74         {
  75             if (m_CacheSize % CACHE_INCREMENT == 0)
  76                 m_Cache = (wxHtmlCacheItem*) realloc(m_Cache, (m_CacheSize + CACHE_INCREMENT) * sizeof(wxHtmlCacheItem));
  77             tg = m_CacheSize++;
  78             m_Cache[tg].Key = stpos = pos++;
  79             dummy[0] = 0; i = 0;
  80             while (pos < lng &&
  81                    src[pos] != wxT('>') &&
  82                    src[pos] != wxT(' ') && src[pos] != wxT('\r') &&
  83                    src[pos] != wxT('\n') && src[pos] != wxT('\t'))
  84             {
  85                 dummy[i] = src[pos++];
  86                 if ((dummy[i] >= wxT('a')) && (dummy[i] <= wxT('z'))) dummy[i] -= (wxT('a') - wxT('A'));
  87                 i++;
  88             }
  89             dummy[i] = 0;
  90             m_Cache[tg].Name = new wxChar[i+1];
  91             memcpy(m_Cache[tg].Name, dummy, (i+1)*sizeof(wxChar));
  92
  93             while (pos < lng && src[pos] != wxT('>')) pos++;
  94
  95             if (src[stpos+1] == wxT('/')) // ending tag:
  96             {
  97                 m_Cache[tg].End1 = m_Cache[tg].End2 = -2;
  98                 // find matching begin tag:
  99                 for (i = tg; i >= 0; i--)
 100                     if ((m_Cache[i].End1 == -1) && (wxStrcmp(m_Cache[i].Name, dummy+1) == 0))
 101                     {
 102                         m_Cache[i].End1 = stpos;
 103                         m_Cache[i].End2 = pos + 1;
 104                         break;
 105                     }
 106             }
 107             else
 108             {
 109                 m_Cache[tg].End1 = m_Cache[tg].End2 = -1;
 110             }
 111         }
 112
 113         pos++;
 114     }
 115
 116     // ok, we're done, now we'll free .Name members of cache - we don't need it anymore:
 117     for (i = 0; i < m_CacheSize; i++)
 118     {
 119         delete[] m_Cache[i].Name;
 120         m_Cache[i].Name = NULL;
 121     }
 122 }
 123
 124 void wxHtmlTagsCache::QueryTag(int at, int* end1, int* end2)
 125 {
 126     if (m_Cache == NULL) return;
 127     if (m_Cache[m_CachePos].Key != at)
 128     {
 129         int delta = (at < m_Cache[m_CachePos].Key) ? -1 : 1;
 130         do
 131         {
 132             m_CachePos += delta;
 133         }
 134         while (m_Cache[m_CachePos].Key != at);
 135     }
 136     *end1 = m_Cache[m_CachePos].End1;
 137     *end2 = m_Cache[m_CachePos].End2;
 138 }
 139
 140
 141
 142
 143 //-----------------------------------------------------------------------------
 144 // wxHtmlTag
 145 //-----------------------------------------------------------------------------
 146
 147 IMPLEMENT_CLASS(wxHtmlTag,wxObject)
 148
 149 wxHtmlTag::wxHtmlTag(const wxString& source, int pos, int end_pos,
 150                      wxHtmlTagsCache *cache,
 151                      wxHtmlEntitiesParser *entParser) : wxObject()
 152 {
 153     int i;
 154     wxChar c;
 155
 156     // fill-in name, params and begin pos:
 157     i = pos+1;
 158     if (source[i] == wxT('/'))
 159         { m_Ending = TRUE; i++; }
 160     else
 161         m_Ending = FALSE;
 162
 163     // find tag's name and convert it to uppercase:
 164     while ((i < end_pos) &&
 165            ((c = source[i++]) != wxT(' ') && c != wxT('\r') &&
 166              c != wxT('\n') && c != wxT('\t') &&
 167              c != wxT('>')))
 168     {
 169         if ((c >= wxT('a')) && (c <= wxT('z')))
 170             c -= (wxT('a') - wxT('A'));
 171         m_Name << c;
 172     }
 173
 174     // if the tag has parameters, read them and "normalize" them,
 175     // i.e. convert to uppercase, replace whitespaces by spaces and
 176     // remove whitespaces around '=':
 177     if (source[i-1] != wxT('>'))
 178     {
 179         #define IS_WHITE(c) (c == wxT(' ') || c == wxT('\r') || \
 180                              c == wxT('\n') || c == wxT('\t'))
 181         wxString pname, pvalue;
 182         wxChar quote;
 183         enum
 184         {
 185             ST_BEFORE_NAME = 1,
 186             ST_NAME,
 187             ST_BEFORE_EQ,
 188             ST_BEFORE_VALUE,
 189             ST_VALUE
 190         } state;
 191
 192         quote = 0;
 193         state = ST_BEFORE_NAME;
 194         while (i < end_pos)
 195         {
 196             c = source[i++];
 197
 198             if (c == wxT('>') && !(state == ST_VALUE && quote != 0))
 199             {
 200                 if (state == ST_BEFORE_EQ || state == ST_NAME)
 201                 {
 202                     m_ParamNames.Add(pname);
 203                     m_ParamValues.Add(wxEmptyString);
 204                 }
 205                 else if (state == ST_VALUE && quote == 0)
 206                 {
 207                     m_ParamNames.Add(pname);
 208                     if (entParser)
 209                         m_ParamValues.Add(entParser->Parse(pvalue));
 210                     else
 211                         m_ParamValues.Add(pvalue);
 212                 }
 213                 break;
 214             }
 215             switch (state)
 216             {
 217                 case ST_BEFORE_NAME:
 218                     if (!IS_WHITE(c))
 219                     {
 220                         pname = c;
 221                         state = ST_NAME;
 222                     }
 223                     break;
 224                 case ST_NAME:
 225                     if (IS_WHITE(c))
 226                         state = ST_BEFORE_EQ;
 227                     else if (c == wxT('='))
 228                         state = ST_BEFORE_VALUE;
 229                     else
 230                         pname << c;
 231                     break;
 232                 case ST_BEFORE_EQ:
 233                     if (c == wxT('='))
 234                         state = ST_BEFORE_VALUE;
 235                     else if (!IS_WHITE(c))
 236                     {
 237                         m_ParamNames.Add(pname);
 238                         m_ParamValues.Add(wxEmptyString);
 239                         pname = c;
 240                         state = ST_NAME;
 241                     }
 242                     break;
 243                 case ST_BEFORE_VALUE:
 244                     if (!IS_WHITE(c))
 245                     {
 246                         if (c == wxT('"') || c == wxT('\''))
 247                             quote = c, pvalue = wxEmptyString;
 248                         else
 249                             quote = 0, pvalue = c;
 250                         state = ST_VALUE;
 251                     }
 252                     break;
 253                 case ST_VALUE:
 254                     if ((quote != 0 && c == quote) ||
 255                         (quote == 0 && IS_WHITE(c)))
 256                     {
 257                         m_ParamNames.Add(pname);
 258                         if (quote == 0)
 259                         {
 260                             // VS: backward compatibility, no real reason,
 261                             //     but wxHTML code relies on this... :(
 262                             pvalue.MakeUpper();
 263                         }
 264                         if (entParser)
 265                             m_ParamValues.Add(entParser->Parse(pvalue));
 266                         else
 267                             m_ParamValues.Add(pvalue);
 268                         state = ST_BEFORE_NAME;
 269                     }
 270                     else
 271                         pvalue << c;
 272                     break;
 273             }
 274         }
 275
 276         #undef IS_WHITE
 277    }
 278    m_Begin = i;
 279
 280    cache->QueryTag(pos, &m_End1, &m_End2);
 281    if (m_End1 > end_pos) m_End1 = end_pos;
 282    if (m_End2 > end_pos) m_End2 = end_pos;
 283 }
 284
 285 bool wxHtmlTag::HasParam(const wxString& par) const
 286 {
 287     return (m_ParamNames.Index(par, FALSE) != wxNOT_FOUND);
 288 }
 289
 290 wxString wxHtmlTag::GetParam(const wxString& par, bool with_commas) const
 291 {
 292     int index = m_ParamNames.Index(par, FALSE);
 293     if (index == wxNOT_FOUND)
 294         return wxEmptyString;
 295     if (with_commas)
 296     {
 297         // VS: backward compatibility, seems to be never used by wxHTML...
 298         wxString s;
 299         s << wxT('"') << m_ParamValues[index] << wxT('"');
 300         return s;
 301     }
 302     else
 303         return m_ParamValues[index];
 304 }
 305
 306 int wxHtmlTag::ScanParam(const wxString& par, wxChar *format, void *param) const
 307 {
 308     wxString parval = GetParam(par);
 309     return wxSscanf(parval, format, param);
 310 }
 311
 312 bool wxHtmlTag::GetParamAsColour(const wxString& par, wxColour *clr) const
 313 {
 314     wxString str = GetParam(par);
 315
 316     if (str.IsEmpty()) return FALSE;
 317     if (str.GetChar(0) == wxT('#'))
 318     {
 319         unsigned long tmp;
 320         if (ScanParam(par, wxT("#%lX"), &tmp) != 1)
 321             return FALSE;
 322         *clr = wxColour((unsigned char)((tmp & 0xFF0000) >> 16),
 323                                             (unsigned char)((tmp & 0x00FF00) >> 8),
 324                                             (unsigned char)(tmp & 0x0000FF));
 325         return TRUE;
 326     }
 327     else
 328     {
 329         // Handle colours defined in HTML 4.0:
 330         #define HTML_COLOUR(name,r,g,b)                 \
 331             if (str.IsSameAs(wxT(name), FALSE))         \
 332                 { *clr = wxColour(r,g,b); return TRUE; }
 333         HTML_COLOUR("black",   0x00,0x00,0x00)
 334         HTML_COLOUR("silver",  0xC0,0xC0,0xC0)
 335         HTML_COLOUR("gray",    0x80,0x80,0x80)
 336         HTML_COLOUR("white",   0xFF,0xFF,0xFF)
 337         HTML_COLOUR("maroon",  0x80,0x00,0x00)
 338         HTML_COLOUR("red",     0xFF,0x00,0x00)
 339         HTML_COLOUR("purple",  0x80,0x00,0x80)
 340         HTML_COLOUR("fuchsia", 0xFF,0x00,0xFF)
 341         HTML_COLOUR("green",   0x00,0x80,0x00)
 342         HTML_COLOUR("lime",    0x00,0xFF,0x00)
 343         HTML_COLOUR("olive",   0x80,0x80,0x00)
 344         HTML_COLOUR("yellow",  0xFF,0xFF,0x00)
 345         HTML_COLOUR("navy",    0x00,0x00,0x80)
 346         HTML_COLOUR("blue",    0x00,0x00,0xFF)
 347         HTML_COLOUR("teal",    0x00,0x80,0x80)
 348         HTML_COLOUR("aqua",    0x00,0xFF,0xFF)
 349         #undef HTML_COLOUR
 350         return FALSE;
 351     }
 352 }
 353
 354 bool wxHtmlTag::GetParamAsInt(const wxString& par, int *clr) const
 355 {
 356     if (!HasParam(par)) return FALSE;
 357     long i;
 358     bool succ = GetParam(par).ToLong(&i);
 359     *clr = (int)i;
 360     return succ;
 361 }
 362
 363 wxString wxHtmlTag::GetAllParams() const
 364 {
 365     // VS: this function is for backward compatiblity only,
 366     //     never used by wxHTML
 367     wxString s;
 368     size_t cnt = m_ParamNames.GetCount();
 369     for (size_t i = 0; i < cnt; i++)
 370     {
 371         s << m_ParamNames[i];
 372         s << wxT('=');
 373         if (m_ParamValues[i].Find(wxT('"')) != wxNOT_FOUND)
 374             s << wxT('\'') << m_ParamValues[i] << wxT('\'');
 375         else
 376             s << wxT('"') << m_ParamValues[i] << wxT('"');
 377     }
 378     return s;
 379 }
 380
 381 #endif