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 #include "wx/wx.h"
  26 #endif
  27
  28 #include "wx/html/htmltag.h"
  29 #include <stdio.h> // for vsscanf
  30 #include <stdarg.h>
  31
  32
  33
  34
  35 //-----------------------------------------------------------------------------
  36 // wxHtmlTagsCache
  37 //-----------------------------------------------------------------------------
  38
  39 IMPLEMENT_CLASS(wxHtmlTagsCache,wxObject)
  40
  41 #define CACHE_INCREMENT  64
  42
  43 wxHtmlTagsCache::wxHtmlTagsCache(const wxString& source)
  44 {
  45     const wxChar *src = source.c_str();
  46     int i, tg, pos, stpos;
  47     int lng = source.Length();
  48     wxChar dummy[256];
  49
  50     m_Cache = NULL;
  51     m_CacheSize = 0;
  52     m_CachePos = 0;
  53
  54     pos = 0;
  55     while (pos < lng) {
  56         if (src[pos] == wxT('<')) {  // tag found:
  57             if (m_CacheSize % CACHE_INCREMENT == 0)
  58                 m_Cache = (sCacheItem*) realloc(m_Cache, (m_CacheSize + CACHE_INCREMENT) * sizeof(sCacheItem));
  59             tg = m_CacheSize++;
  60             m_Cache[tg].Key = stpos = pos++;
  61             dummy[0] = 0; i = 0;
  62             while (src[pos] != wxT('>') &&
  63                    src[pos] != wxT(' ') && src[pos] != wxT('\r') &&
  64                    src[pos] != wxT('\n') && src[pos] != wxT('\t')) {
  65                 dummy[i] = src[pos++];
  66                 if ((dummy[i] >= wxT('a')) && (dummy[i] <= wxT('z'))) dummy[i] -= (wxT('a') - wxT('A'));
  67                 i++;
  68             }
  69             dummy[i] = 0;
  70             m_Cache[tg].Name = new wxChar[i+1];
  71             memcpy(m_Cache[tg].Name, dummy, (i+1)*sizeof(wxChar));
  72
  73             while (src[pos] != wxT('>')) pos++;
  74
  75             if (src[stpos+1] == wxT('/')) { // ending tag:
  76                 m_Cache[tg].End1 = m_Cache[tg].End2 = -2;
  77                 // find matching begin tag:
  78                 for (i = tg; i >= 0; i--)
  79                     if ((m_Cache[i].End1 == -1) && (wxStrcmp(m_Cache[i].Name, dummy+1) == 0)) {
  80                         m_Cache[i].End1 = stpos;
  81                         m_Cache[i].End2 = pos + 1;
  82                         break;
  83                     }
  84             }
  85             else {
  86                 m_Cache[tg].End1 = m_Cache[tg].End2 = -1;
  87             }
  88         }
  89
  90         pos++;
  91     }
  92
  93     // ok, we're done, now we'll free .Name members of cache - we don't need it anymore:
  94     for (i = 0; i < m_CacheSize; i++) {
  95         delete[] m_Cache[i].Name;
  96         m_Cache[i].Name = NULL;
  97     }
  98 }
  99
 100
 101
 102 void wxHtmlTagsCache::QueryTag(int at, int* end1, int* end2)
 103 {
 104     if (m_Cache == NULL) return;
 105     if (m_Cache[m_CachePos].Key != at) {
 106         int delta = (at < m_Cache[m_CachePos].Key) ? -1 : 1;
 107         do {m_CachePos += delta;} while (m_Cache[m_CachePos].Key != at);
 108     }
 109     *end1 = m_Cache[m_CachePos].End1;
 110     *end2 = m_Cache[m_CachePos].End2;
 111 }
 112
 113
 114
 115
 116 //-----------------------------------------------------------------------------
 117 // wxHtmlTag
 118 //-----------------------------------------------------------------------------
 119
 120 IMPLEMENT_CLASS(wxHtmlTag,wxObject)
 121
 122 wxHtmlTag::wxHtmlTag(const wxString& source, int pos, int end_pos, wxHtmlTagsCache* cache) : wxObject()
 123 {
 124     int i;
 125     char c;
 126
 127     // fill-in name, params and begin pos:
 128     m_Name = m_Params = wxEmptyString;
 129     i = pos+1;
 130     if (source[i] == '/') {m_Ending = TRUE; i++;}
 131     else m_Ending = FALSE;
 132
 133     while ((i < end_pos) &&
 134                ((c = source[i++]) != ' ' && c != '\r' && c != '\n' && c != '\t' &&
 135                 c != '>')) {
 136         if ((c >= 'a') && (c <= 'z')) c -= ('a' - 'A');
 137         m_Name += c;
 138     }
 139
 140     if (source[i-1] != '>')
 141         while ((i < end_pos) && ((c = source[i++]) != '>')) {
 142             if ((c >= 'a') && (c <= 'z')) c -= ('a' - 'A');
 143             if (c == '\r' || c == '\n' || c == '\t') c = ' '; // make future parsing a bit simpler
 144             m_Params += c;
 145             if (c == '"') {
 146                 while ((i < end_pos) && ((c = source[i++]) != '"')) m_Params += c;
 147                 m_Params += c;
 148             }
 149             else if (c == '\'') {
 150                 while ((i < end_pos) && ((c = source[i++]) != '\'')) m_Params += c;
 151                 m_Params += c;
 152             }
 153         }
 154    m_Begin = i;
 155
 156    cache -> QueryTag(pos, &m_End1, &m_End2);
 157    if (m_End1 > end_pos) m_End1 = end_pos;
 158    if (m_End2 > end_pos) m_End2 = end_pos;
 159 }
 160
 161
 162
 163 bool wxHtmlTag::HasParam(const wxString& par) const
 164 {
 165     const wxChar *st = m_Params, *p = par;
 166     const wxChar *st2, *p2;
 167
 168     if (*st == 0) return FALSE;
 169     if (*p == 0) return FALSE;
 170     for (st2 = st, p2 = p; ; st2++) {
 171         if (*p2 == 0) return TRUE;
 172         if (*st2 == 0) return FALSE;
 173         if (*p2 != *st2) p2 = p;
 174         if (*p2 == *st2) p2++;
 175         if (*st2 == ' ') p2 = p;
 176         else if (*st2 == '=') {
 177             p2 = p;
 178             while (*st2 != ' ') {
 179                 if (*st2 == '"') {
 180                     st2++;
 181                     while (*st2 != '"') st2++;
 182                 }
 183                 st2++;
 184                 if (*st2 == 0) return FALSE;
 185             }
 186         }
 187     }
 188 }
 189
 190
 191
 192 wxString wxHtmlTag::GetParam(const wxString& par, bool with_commas) const
 193 {
 194     const wxChar *st = m_Params, *p = par;
 195     const wxChar *st2, *p2;
 196     bool comma;
 197     char comma_char;
 198
 199     if (*st == 0) return "";
 200     if (*p == 0) return "";
 201     for (st2 = st, p2 = p; ; st2++) {
 202         if (*p2 == 0) { // found
 203             wxString fnd = "";
 204             st2++; // '=' character
 205             comma = FALSE;
 206             comma_char = '\0';
 207             if (!with_commas && (*(st2) == '"')) {
 208                 st2++;
 209                 comma = TRUE;
 210                 comma_char = '"';
 211             }
 212             else if (!with_commas && (*(st2) == '\'')) {
 213                 st2++;
 214                 comma = TRUE;
 215                 comma_char = '\'';
 216             }
 217             while (*st2 != 0) {
 218                 if (comma && *st2 == comma_char) comma = FALSE;
 219                 else if ((*st2 == ' ') && (!comma)) break;
 220                 fnd += (*(st2++));
 221             }
 222             if (!with_commas && (*(st2-1) == comma_char)) fnd.RemoveLast();
 223             return fnd;
 224         }
 225         if (*st2 == 0) return "";
 226         if (*p2 != *st2) p2 = p;
 227         if (*p2 == *st2) p2++;
 228         if (*st2 == ' ') p2 = p;
 229         else if (*st2 == '=') {
 230             p2 = p;
 231             while (*st2 != ' ') {
 232                 if (*st2 == '"') {
 233                     st2++;
 234                     while (*st2 != '"') st2++;
 235                 }
 236                 else if (*st2 == '\'') {
 237                     st2++;
 238                     while (*st2 != '\'') st2++;
 239                 }
 240                 st2++;
 241             }
 242         }
 243     }
 244 }
 245
 246
 247
 248 int wxHtmlTag::ScanParam(const wxString& par, wxChar *format, void *param) const
 249 {
 250     wxString parval = GetParam(par);
 251     return wxSscanf((const wxChar*)parval, format, param);
 252 }
 253
 254 #endif