src/html/htmlpars.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        htmlpars.cpp
   3 // Purpose:     wxHtmlParser class (generic parser)
   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 && wxUSE_STREAMS
  19
  20 #ifdef __BORDLANDC__
  21 #pragma hdrstop
  22 #endif
  23
  24 #ifndef WXPRECOMP
  25 #include "wx/wx.h"
  26 #endif
  27
  28 #include "wx/tokenzr.h"
  29 #include "wx/wfstream.h"
  30 #include "wx/url.h"
  31 #include "wx/html/htmldefs.h"
  32 #include "wx/html/htmlpars.h"
  33
  34
  35
  36 //-----------------------------------------------------------------------------
  37 // wxHtmlParser
  38 //-----------------------------------------------------------------------------
  39
  40 IMPLEMENT_ABSTRACT_CLASS(wxHtmlParser,wxObject)
  41
  42
  43 wxObject* wxHtmlParser::Parse(const wxString& source)
  44 {
  45     wxObject *result;
  46
  47     InitParser(source);
  48     DoParsing();
  49     result = GetProduct();
  50     DoneParser();
  51     return result;
  52 }
  53
  54
  55
  56 void wxHtmlParser::InitParser(const wxString& source)
  57 {
  58     m_Source = source;
  59     m_Cache = new wxHtmlTagsCache(m_Source);
  60 }
  61
  62
  63
  64 void wxHtmlParser::DoneParser()
  65 {
  66     delete m_Cache;
  67     m_Cache = NULL;
  68 }
  69
  70
  71
  72 #define wxHTML_MAX_BUFLEN 1024
  73
  74 void wxHtmlParser::DoParsing(int begin_pos, int end_pos)
  75 {
  76     char temp[wxHTML_BUFLEN], c;
  77     int i;
  78     int templen;
  79
  80     templen = 0;
  81     i = begin_pos;
  82
  83     while (i < end_pos) {
  84         c = m_Source[(unsigned int) i];
  85
  86         // continue building word:
  87         if (c != '<') {
  88             temp[templen++] = c;
  89             if (templen == wxHTML_BUFLEN-1) {
  90                 temp[templen] = 0;
  91                 AddText(temp);
  92                 templen = 0;
  93             }
  94             i++;
  95         }
  96
  97         else if (c == '<')  {
  98             wxHtmlTag tag(m_Source, i, end_pos, m_Cache);
  99
 100             if (templen) {
 101                 temp[templen] = 0;
 102                 AddText(temp);
 103                 templen = 0;
 104             }
 105             AddTag(tag);
 106             if (tag.HasEnding()) i = tag.GetEndPos2();
 107             else i = tag.GetBeginPos();
 108         }
 109     }
 110
 111     if (templen) { // last word of block :-(
 112         temp[templen] = 0;
 113         AddText(temp);
 114     }
 115 }
 116
 117
 118
 119 void wxHtmlParser::AddTag(const wxHtmlTag& tag)
 120 {
 121     wxHtmlTagHandler *h;
 122     bool inner = FALSE;
 123
 124     h = (wxHtmlTagHandler*) m_HandlersHash.Get(tag.GetName());
 125     if (h)
 126         inner = h -> HandleTag(tag);
 127     if (!inner) {
 128         if (tag.HasEnding())
 129             DoParsing(tag.GetBeginPos(), tag.GetEndPos1());
 130     }
 131 }
 132
 133
 134
 135 void wxHtmlParser::AddTagHandler(wxHtmlTagHandler *handler)
 136 {
 137     wxString s(handler -> GetSupportedTags());
 138     wxStringTokenizer tokenizer(s, ", ");
 139
 140     while (tokenizer.HasMoreTokens())
 141         m_HandlersHash.Put(tokenizer.NextToken(), handler);
 142
 143     if (m_HandlersList.IndexOf(handler) == wxNOT_FOUND)
 144         m_HandlersList.Append(handler);
 145
 146     handler -> SetParser(this);
 147 }
 148
 149
 150
 151 void wxHtmlParser::PushTagHandler(wxHtmlTagHandler *handler, wxString tags)
 152 {
 153     wxStringTokenizer tokenizer(tags, ", ");
 154     wxString key;
 155
 156     if (m_HandlersStack == NULL) {
 157         m_HandlersStack = new wxList;
 158         m_HandlersStack -> DeleteContents(TRUE);
 159     }
 160
 161     m_HandlersStack -> Insert(new wxHashTable(m_HandlersHash));
 162
 163     while (tokenizer.HasMoreTokens()) {
 164         key = tokenizer.NextToken();
 165         m_HandlersHash.Delete(key);
 166         m_HandlersHash.Put(key, handler);
 167     }
 168 }
 169
 170
 171
 172 void wxHtmlParser::PopTagHandler()
 173 {
 174     wxNode *first;
 175
 176     if (m_HandlersStack == NULL ||
 177         (first = m_HandlersStack -> GetFirst()) == NULL)
 178     {
 179         wxLogWarning(_("Warning: attempt to remove HTML tag handler from empty stack."));
 180         return;
 181     }
 182     m_HandlersHash = *((wxHashTable*) first -> GetData());
 183     m_HandlersStack -> DeleteNode(first);
 184 }
 185
 186
 187
 188 wxHtmlParser::~wxHtmlParser()
 189 {
 190     if (m_HandlersStack) delete m_HandlersStack;
 191     m_HandlersHash.Clear();
 192     m_HandlersList.DeleteContents(TRUE);
 193     m_HandlersList.Clear();
 194 }
 195
 196
 197
 198 //-----------------------------------------------------------------------------
 199 // wxHtmlTagHandler
 200 //-----------------------------------------------------------------------------
 201
 202 IMPLEMENT_ABSTRACT_CLASS(wxHtmlTagHandler,wxObject)
 203 #endif
 204