src/html/htmlfilt.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        htmlfilt.cpp
   3 // Purpose:     wxHtmlFilter - input filter for translating into HTML format
   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/html/htmlfilt.h"
  29 #include "wx/html/htmlwin.h"
  30
  31
  32 /*
  33
  34 There is code for several default filters:
  35
  36 */
  37
  38 IMPLEMENT_ABSTRACT_CLASS(wxHtmlFilter, wxObject)
  39
  40 //--------------------------------------------------------------------------------
  41 // wxHtmlFilterPlainText
  42 //          filter for text/plain or uknown
  43 //--------------------------------------------------------------------------------
  44
  45 IMPLEMENT_DYNAMIC_CLASS(wxHtmlFilterPlainText, wxHtmlFilter)
  46
  47 bool wxHtmlFilterPlainText::CanRead(const wxFSFile& WXUNUSED(file)) const
  48 {
  49     return TRUE;
  50 }
  51
  52
  53
  54 wxString wxHtmlFilterPlainText::ReadFile(const wxFSFile& file) const
  55 {
  56     wxInputStream *s = file.GetStream();
  57     char *src;
  58     wxString doc, doc2;
  59
  60     if (s == NULL) return wxEmptyString;
  61     src = new char[s->GetSize()+1];
  62     src[s->GetSize()] = 0;
  63     s->Read(src, s->GetSize());
  64     doc = src;
  65     delete [] src;
  66
  67     doc.Replace(wxT("<"), wxT("&lt;"), TRUE);
  68     doc.Replace(wxT(">"), wxT("&gt;"), TRUE);
  69     doc2 = "<HTML><BODY><PRE>\n" + doc + "\n</PRE></BODY></HTML>";
  70     return doc2;
  71 }
  72
  73
  74
  75
  76
  77 //--------------------------------------------------------------------------------
  78 // wxHtmlFilterImage
  79 //          filter for image/*
  80 //--------------------------------------------------------------------------------
  81
  82 class wxHtmlFilterImage : public wxHtmlFilter
  83 {
  84     DECLARE_DYNAMIC_CLASS(wxHtmlFilterImage)
  85
  86     public:
  87         virtual bool CanRead(const wxFSFile& file) const;
  88         virtual wxString ReadFile(const wxFSFile& file) const;
  89 };
  90
  91 IMPLEMENT_DYNAMIC_CLASS(wxHtmlFilterImage, wxHtmlFilter)
  92
  93
  94
  95 bool wxHtmlFilterImage::CanRead(const wxFSFile& file) const
  96 {
  97     return (file.GetMimeType().Left(6) == wxT("image/"));
  98 }
  99
 100
 101
 102 wxString wxHtmlFilterImage::ReadFile(const wxFSFile& file) const
 103 {
 104     return ("<HTML><BODY><IMG SRC=\"" + file.GetLocation() + "\"></BODY></HTML>");
 105 }
 106
 107
 108
 109
 110 //--------------------------------------------------------------------------------
 111 // wxHtmlFilterPlainText
 112 //          filter for text/plain or uknown
 113 //--------------------------------------------------------------------------------
 114
 115 class wxHtmlFilterHTML : public wxHtmlFilter
 116 {
 117     DECLARE_DYNAMIC_CLASS(wxHtmlFilterHTML)
 118
 119     public:
 120         virtual bool CanRead(const wxFSFile& file) const;
 121         virtual wxString ReadFile(const wxFSFile& file) const;
 122 };
 123
 124
 125 IMPLEMENT_DYNAMIC_CLASS(wxHtmlFilterHTML, wxHtmlFilter)
 126
 127 bool wxHtmlFilterHTML::CanRead(const wxFSFile& file) const
 128 {
 129 //    return (file.GetMimeType() == "text/html");
 130 // This is true in most case but some page can return:
 131 // "text/html; char-encoding=...."
 132 // So we use Find instead
 133   return (file.GetMimeType().Find(wxT("text/html")) == 0);
 134 }
 135
 136
 137
 138 wxString wxHtmlFilterHTML::ReadFile(const wxFSFile& file) const
 139 {
 140     wxInputStream *s = file.GetStream();
 141     char *src;
 142     wxString doc;
 143
 144     if (s == NULL)
 145     {
 146         wxLogError(_("Cannot open HTML document: %s"), file.GetLocation().c_str());
 147         return wxEmptyString;
 148     }
 149     src = new char[s->GetSize() + 1];
 150     src[s->GetSize()] = 0;
 151     s->Read(src, s->GetSize());
 152     doc = src;
 153     delete[] src;
 154
 155     // add meta tag if we obtained this through http:
 156     if (file.GetMimeType().Find(_T("; charset=")) == 0)
 157     {
 158         wxString s(_T("<meta http-equiv=\"Content-Type\" content=\""));
 159         s << file.GetMimeType() <<  _T("\">");
 160         return s;
 161     }
 162
 163     return doc;
 164 }
 165
 166
 167
 168
 169 ///// Module:
 170
 171 class wxHtmlFilterModule : public wxModule
 172 {
 173     DECLARE_DYNAMIC_CLASS(wxHtmlFilterModule)
 174
 175     public:
 176         virtual bool OnInit()
 177         {
 178             wxHtmlWindow::AddFilter(new wxHtmlFilterHTML);
 179             wxHtmlWindow::AddFilter(new wxHtmlFilterImage);
 180             return TRUE;
 181         }
 182         virtual void OnExit() {}
 183 };
 184
 185 IMPLEMENT_DYNAMIC_CLASS(wxHtmlFilterModule, wxModule)
 186
 187 #endif