htmlfilt.cpp
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CPP
230 行
/////////////////////////////////////////////////////////////////////////////
// Name: htmlfilt.cpp
// Purpose: wxHtmlFilter - input filter for translating into HTML format
// Author: Vaclav Slavik
// RCS-ID: $Id: htmlfilt.cpp,v 1.21 2004/09/27 19:15:04 ABX Exp $
// Copyright: (c) 1999 Vaclav Slavik
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "htmlfilt.h"
#endif
#include "wx/wxprec.h"
#include "wx/defs.h"
#if wxUSE_HTML && wxUSE_STREAMS
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#ifndef WXPRECOMP
#include "wx/log.h"
#include "wx/intl.h"
#endif
#include "wx/strconv.h"
#include "wx/html/htmlfilt.h"
#include "wx/html/htmlwin.h"
// utility function: read a wxString from a wxInputStream
static void ReadString(wxString& str, wxInputStream* s, wxMBConv& conv)
{
size_t streamSize = s->GetSize();
if (streamSize == ~(size_t)0)
{
const size_t bufSize = 4095;
char buffer[bufSize+1];
size_t lastRead;
do
{
s->Read(buffer, bufSize);
lastRead = s->LastRead();
buffer[lastRead] = 0;
str.Append(wxString(buffer, conv));
}
while (lastRead == bufSize);
}
else
{
char* src = new char[streamSize+1];
s->Read(src, streamSize);
src[streamSize] = 0;
str = wxString(src, conv);
delete[] src;
}
}
/*
There is code for several default filters:
*/
IMPLEMENT_ABSTRACT_CLASS(wxHtmlFilter, wxObject)
//--------------------------------------------------------------------------------
// wxHtmlFilterPlainText
// filter for text/plain or uknown
//--------------------------------------------------------------------------------
IMPLEMENT_DYNAMIC_CLASS(wxHtmlFilterPlainText, wxHtmlFilter)
bool wxHtmlFilterPlainText::CanRead(const wxFSFile& WXUNUSED(file)) const
{
return true;
}
wxString wxHtmlFilterPlainText::ReadFile(const wxFSFile& file) const
{
wxInputStream *s = file.GetStream();
wxString doc, doc2;
if (s == NULL) return wxEmptyString;
ReadString(doc, s, wxConvISO8859_1);
doc.Replace(wxT("&"), wxT("&"), true);
doc.Replace(wxT("<"), wxT("<"), true);
doc.Replace(wxT(">"), wxT(">"), true);
doc2 = wxT("<HTML><BODY><PRE>\n") + doc + wxT("\n</PRE></BODY></HTML>");
return doc2;
}
//--------------------------------------------------------------------------------
// wxHtmlFilterImage
// filter for image/*
//--------------------------------------------------------------------------------
class wxHtmlFilterImage : public wxHtmlFilter
{
DECLARE_DYNAMIC_CLASS(wxHtmlFilterImage)
public:
virtual bool CanRead(const wxFSFile& file) const;
virtual wxString ReadFile(const wxFSFile& file) const;
};
IMPLEMENT_DYNAMIC_CLASS(wxHtmlFilterImage, wxHtmlFilter)
bool wxHtmlFilterImage::CanRead(const wxFSFile& file) const
{
return (file.GetMimeType().Left(6) == wxT("image/"));
}
wxString wxHtmlFilterImage::ReadFile(const wxFSFile& file) const
{
wxString res = wxT("<HTML><BODY><IMG SRC=\"") + file.GetLocation() + wxT("\"></BODY></HTML>");
return res;
}
//--------------------------------------------------------------------------------
// wxHtmlFilterHTML
// filter for text/html
//--------------------------------------------------------------------------------
IMPLEMENT_DYNAMIC_CLASS(wxHtmlFilterHTML, wxHtmlFilter)
bool wxHtmlFilterHTML::CanRead(const wxFSFile& file) const
{
// return (file.GetMimeType() == "text/html");
// This is true in most case but some page can return:
// "text/html; char-encoding=...."
// So we use Find instead
return (file.GetMimeType().Find(wxT("text/html")) == 0);
}
wxString wxHtmlFilterHTML::ReadFile(const wxFSFile& file) const
{
wxInputStream *s = file.GetStream();
wxString doc;
if (s == NULL)
{
wxLogError(_("Cannot open HTML document: %s"), file.GetLocation().c_str());
return wxEmptyString;
}
// NB: We convert input file to wchar_t here in Unicode mode, based on
// either Content-Type header or <meta> tags. In ANSI mode, we don't
// do it as it is done by wxHtmlParser (for this reason, we add <meta>
// tag if we used Content-Type header).
#if wxUSE_UNICODE
int charsetPos;
if ((charsetPos = file.GetMimeType().Find(_T("; charset="))) != wxNOT_FOUND)
{
wxString charset = file.GetMimeType().Mid(charsetPos + 10);
wxCSConv conv(charset);
ReadString(doc, s, conv);
}
else
{
wxString tmpdoc;
ReadString(tmpdoc, s, wxConvISO8859_1);
wxString charset = wxHtmlParser::ExtractCharsetInformation(tmpdoc);
if (charset.empty())
doc = tmpdoc;
else
{
wxCSConv conv(charset);
doc = wxString(tmpdoc.mb_str(wxConvISO8859_1), conv);
}
}
#else // !wxUSE_UNICODE
ReadString(doc, s, wxConvLibc);
// add meta tag if we obtained this through http:
if (!file.GetMimeType().empty())
{
wxString hdr;
wxString mime = file.GetMimeType();
hdr.Printf(_T("<meta http-equiv=\"Content-Type\" content=\"%s\">"), mime.c_str());
return hdr+doc;
}
#endif
return doc;
}
///// Module:
class wxHtmlFilterModule : public wxModule
{
DECLARE_DYNAMIC_CLASS(wxHtmlFilterModule)
public:
virtual bool OnInit()
{
wxHtmlWindow::AddFilter(new wxHtmlFilterHTML);
wxHtmlWindow::AddFilter(new wxHtmlFilterImage);
return true;
}
virtual void OnExit() {}
};
IMPLEMENT_DYNAMIC_CLASS(wxHtmlFilterModule, wxModule)
#endif
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