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