src/html/htmltag.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        htmltag.cpp
   3 // Purpose:     wxHtmlTag class (represents single tag)
   4 // Author:      Vaclav Slavik
   5 // Copyright:   (c) 1999 Vaclav Slavik
   6 // Licence:     wxWindows Licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9
  10 #ifdef __GNUG__
  11 #pragma implementation
  12 #endif
  13
  14 #include <wx/wxprec.h>
  15
  16 #include "wx/defs.h"
  17 #if wxUSE_HTML
  18
  19 #ifdef __BORDLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #ifndef WXPRECOMP
  24 #include <wx/wx.h>
  25 #endif
  26
  27 #include <wx/html/htmltag.h>
  28 #include <stdarg.h>
  29
  30
  31
  32
  33 //-----------------------------------------------------------------------------
  34 // wxHtmlTagsCache
  35 //-----------------------------------------------------------------------------
  36
  37 IMPLEMENT_CLASS(wxHtmlTagsCache,wxObject)
  38
  39 #define CACHE_INCREMENT  64
  40
  41 wxHtmlTagsCache::wxHtmlTagsCache(const wxString& source)
  42 {
  43     const char *src = source.c_str();
  44     int i, tg, pos, stpos;
  45     int lng = source.Length();
  46     char dummy[256];
  47
  48     m_Cache = NULL;
  49     m_CacheSize = 0;
  50     m_CachePos = 0;
  51
  52     pos = 0;
  53     while (pos < lng) {
  54         if (src[pos] == '<') {  // tag found:
  55             if (m_CacheSize % CACHE_INCREMENT == 0)
  56                 m_Cache = (sCacheItem*) realloc(m_Cache, (m_CacheSize + CACHE_INCREMENT) * sizeof(sCacheItem));
  57             tg = m_CacheSize++;
  58             m_Cache[tg].Key = stpos = pos++;
  59             dummy[0] = 0; i = 0;
  60             while ((src[pos] != '>') && (src[pos] != ' ')) {
  61                 dummy[i] = src[pos++];
  62                 if ((dummy[i] >= 'a') && (dummy[i] <= 'z')) dummy[i] -= ('a' - 'A');
  63                 i++;
  64             }
  65             dummy[i] = 0;
  66             m_Cache[tg].Name = (char*) malloc(i+1);
  67             memcpy(m_Cache[tg].Name, dummy, i+1);
  68
  69             while (src[pos] != '>') pos++;
  70
  71             if (src[stpos+1] == '/') { // ending tag:
  72                 m_Cache[tg].End1 = m_Cache[tg].End2 = -2;
  73                 // find matching begin tag:
  74                 for (i = tg; i >= 0; i--)
  75                     if ((m_Cache[i].End1 == -1) && (strcmp(m_Cache[i].Name, dummy+1) == 0)) {
  76                         m_Cache[i].End1 = stpos;
  77                         m_Cache[i].End2 = pos + 1;
  78                         break;
  79                     }
  80             }
  81             else {
  82                 m_Cache[tg].End1 = m_Cache[tg].End2 = -1;
  83             }
  84         }
  85
  86         pos++;
  87     }
  88
  89     // ok, we're done, now we'll free .Name members of cache - we don't need it anymore:
  90     for (i = 0; i < m_CacheSize; i++) {
  91         free(m_Cache[i].Name);
  92         m_Cache[i].Name = NULL;
  93     }
  94 }
  95
  96
  97
  98 void wxHtmlTagsCache::QueryTag(int at, int* end1, int* end2)
  99 {
 100     if (m_Cache == NULL) return;
 101     if (m_Cache[m_CachePos].Key != at) {
 102         int delta = (at < m_Cache[m_CachePos].Key) ? -1 : 1;
 103         do {m_CachePos += delta;} while (m_Cache[m_CachePos].Key != at);
 104     }
 105     *end1 = m_Cache[m_CachePos].End1;
 106     *end2 = m_Cache[m_CachePos].End2;
 107 }
 108
 109
 110
 111
 112 //-----------------------------------------------------------------------------
 113 // wxHtmlTag
 114 //-----------------------------------------------------------------------------
 115
 116 IMPLEMENT_CLASS(wxHtmlTag,wxObject)
 117
 118 wxHtmlTag::wxHtmlTag(const wxString& source, int pos, int end_pos, wxHtmlTagsCache* cache) : wxObject()
 119 {
 120     int i;
 121     char c;
 122
 123     // fill-in name, params and begin pos:
 124     m_Name = m_Params = wxEmptyString;
 125     i = pos+1;
 126     if (source[i] == '/') {m_Ending = TRUE; i++;}
 127     else m_Ending = FALSE;
 128
 129     while ((i < end_pos) && ((c = source[i++]) != ' ') && (c != '>')) {
 130         if ((c >= 'a') && (c <= 'z')) c -= ('a' - 'A');
 131         m_Name += c;
 132     }
 133
 134     if (source[i-1] != '>')
 135         while ((i < end_pos) && ((c = source[i++]) != '>')) {
 136             if ((c >= 'a') && (c <= 'z')) c -= ('a' - 'A');
 137             m_Params += c;
 138             if (c == '"') {
 139                 while ((i < end_pos) && ((c = source[i++]) != '"')) m_Params += c;
 140                 m_Params += c;
 141             }
 142         }
 143    m_Begin = i;
 144
 145    cache -> QueryTag(pos, &m_End1, &m_End2);
 146    if (m_End1 > end_pos) m_End1 = end_pos;
 147    if (m_End2 > end_pos) m_End2 = end_pos;
 148 }
 149
 150
 151
 152 bool wxHtmlTag::HasParam(const wxString& par) const
 153 {
 154     const char *st = m_Params, *p = par;
 155     const char *st2, *p2;
 156
 157     if (*st == 0) return FALSE;
 158     if (*p == 0) return FALSE;
 159     for (st2 = st, p2 = p; ; st2++) {
 160         if (*p2 == 0) return TRUE;
 161         if (*st2 == 0) return FALSE;
 162         if (*p2 != *st2) p2 = p;
 163         if (*p2 == *st2) p2++;
 164         if (*st2 == ' ') p2 = p;
 165         else if (*st2 == '=') {
 166             p2 = p;
 167             while (*st2 != ' ') {
 168                 if (*st2 == '"') {
 169                     st2++;
 170                     while (*st2 != '"') st2++;
 171                 }
 172                 st2++;
 173                 if (*st2 == 0) return FALSE;
 174             }
 175         }
 176     }
 177 }
 178
 179
 180
 181 wxString wxHtmlTag::GetParam(const wxString& par, bool with_commas) const
 182 {
 183     const char *st = m_Params, *p = par;
 184     const char *st2, *p2;
 185     bool comma;
 186
 187     if (*st == 0) return "";
 188     if (*p == 0) return "";
 189     for (st2 = st, p2 = p; ; st2++) {
 190         if (*p2 == 0) { // found
 191             wxString fnd = "";
 192             st2++; // '=' character
 193             comma = FALSE;
 194             if (!with_commas && (*(st2) == '"')) {st2++; comma = TRUE;}
 195             while (*st2 != 0) {
 196                 if (*st2 == '"') comma = !comma;
 197                 else if ((*st2 == ' ') && (!comma)) break;
 198                 fnd += (*(st2++));
 199             }
 200             if (!with_commas && (*(st2-1) == '"')) fnd.RemoveLast();
 201             return fnd;
 202         }
 203         if (*st2 == 0) return "";
 204         if (*p2 != *st2) p2 = p;
 205         if (*p2 == *st2) p2++;
 206         if (*st2 == ' ') p2 = p;
 207         else if (*st2 == '=') {
 208             p2 = p;
 209             while (*st2 != ' ') {
 210                 if (*st2 == '"') {
 211                     st2++;
 212                     while (*st2 != '"') st2++;
 213                 }
 214                 st2++;
 215             }
 216         }
 217     }
 218 }
 219
 220
 221
 222 void wxHtmlTag::ScanParam(const wxString& par, char *format, ...) const
 223 {
 224     va_list argptr;
 225     wxString parval = GetParam(par);
 226
 227     va_start(argptr, format);
 228
 229 #if defined(__MINGW32__) || defined(__CYGWIN__) || defined(__VISUALC__)
 230     sscanf((const char*)parval, format, va_arg(argptr, void *));
 231 #else
 232     vsscanf((const char*)parval, format, argptr);
 233 #endif
 234
 235 /*
 236         --- vsscanf is not defined under Cygwin or Mingw32 or M$ Visual C++ environment
 237             if this module doesn't compile with your compiler,
 238             modify the def statement and let me know. Thanks...
 239
 240             So far wxHtml functions are scanning only _one_ value
 241             so I workarounded this by supposing that there is only
 242             one ...-parameter
 243 */
 244
 245     va_end(argptr);
 246 }
 247
 248 #endif