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