src/html/htmlparser.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        htmlparser.cpp
   3 // Purpose:     wxHtmlParser class (generic parser)
   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/tokenzr.h>
  28 #include <wx/wfstream.h>
  29 #include <wx/url.h>
  30 #include <wx/html/htmldefs.h>
  31 #include <wx/html/htmlparser.h>
  32
  33
  34
  35 //-----------------------------------------------------------------------------
  36 // wxHtmlParser
  37 //-----------------------------------------------------------------------------
  38
  39 IMPLEMENT_ABSTRACT_CLASS(wxHtmlParser,wxObject)
  40
  41
  42 wxObject* wxHtmlParser::Parse(const wxString& source)
  43 {
  44     wxObject *result;
  45
  46     InitParser(source);
  47     DoParsing();
  48     result = GetProduct();
  49     DoneParser();
  50     return result;
  51 }
  52
  53
  54
  55 void wxHtmlParser::InitParser(const wxString& source)
  56 {
  57     m_Source = source;
  58     m_Cache = new wxHtmlTagsCache(m_Source);
  59 }
  60
  61
  62
  63 void wxHtmlParser::DoneParser()
  64 {
  65     delete m_Cache;
  66     m_Cache = NULL;
  67 }
  68
  69
  70
  71 #define HTML_MAX_BUFLEN 1024
  72
  73 void wxHtmlParser::DoParsing(int begin_pos, int end_pos)
  74 {
  75     char temp[HTML_BUFLEN], c;
  76     int i;
  77     int templen;
  78
  79     templen = 0;
  80     i = begin_pos;
  81
  82     while (i < end_pos) {
  83         c = m_Source[i];
  84
  85         // continue building word:
  86         if (c != '<') {
  87             temp[templen++] = c;
  88             if (templen == HTML_BUFLEN-1) {
  89                 temp[templen] = 0;
  90                 AddText(temp);
  91                 templen = 0;
  92             }
  93             i++;
  94         }
  95
  96         else if (c == '<')  {
  97             wxHtmlTag tag(m_Source, i, end_pos, m_Cache);
  98
  99             if (templen) {
 100                 temp[templen] = 0;
 101                 AddText(temp);
 102                 templen = 0;
 103             }
 104             AddTag(tag);
 105             if (tag.HasEnding()) i = tag.GetEndPos2();
 106             else i = tag.GetBeginPos();
 107         }
 108     }
 109
 110     if (templen) { // last word of block :-(
 111         temp[templen] = 0;
 112         AddText(temp);
 113     }
 114 }
 115
 116
 117
 118 void wxHtmlParser::AddTag(const wxHtmlTag& tag)
 119 {
 120     wxHtmlTagHandler *h;
 121     bool inner = FALSE;
 122
 123     h = (wxHtmlTagHandler*) m_HandlersHash.Get(tag.GetName());
 124     if (h)
 125         inner = h -> HandleTag(tag);
 126     if (!inner) {
 127         if (tag.HasEnding())
 128             DoParsing(tag.GetBeginPos(), tag.GetEndPos1());
 129     }
 130 }
 131
 132
 133
 134 void wxHtmlParser::AddTagHandler(wxHtmlTagHandler *handler)
 135 {
 136     wxString s(handler -> GetSupportedTags());
 137     wxStringTokenizer tokenizer(s, ", ");
 138
 139 #if (wxVERSION_NUMBER < 2100)
 140     while (tokenizer.HasMoreToken())
 141 #else
 142     while (tokenizer.HasMoreTokens())
 143 #endif
 144         m_HandlersHash.Put(tokenizer.NextToken(), handler);
 145
 146     if (m_HandlersList.IndexOf(handler) == wxNOT_FOUND)
 147         m_HandlersList.Append(handler);
 148
 149     handler -> SetParser(this);
 150 }
 151
 152
 153
 154 wxHtmlParser::~wxHtmlParser()
 155 {
 156     m_HandlersHash.Clear();
 157     m_HandlersList.DeleteContents(TRUE);
 158     m_HandlersList.Clear();
 159 }
 160
 161
 162
 163 //-----------------------------------------------------------------------------
 164 // wxHtmlTagHandler
 165 //-----------------------------------------------------------------------------
 166
 167 IMPLEMENT_ABSTRACT_CLASS(wxHtmlTagHandler,wxObject)
 168
 169 #endif