[wxWidgets.git] / src / html / htmlfilt.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        htmlfilt.cpp
// Purpose:     wxHtmlFilter - input filter for translating into HTML format
// Author:      Vaclav Slavik
// RCS-ID:      $Id$
// Copyright:   (c) 1999 Vaclav Slavik
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#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("&amp;"), true);
    doc.Replace(wxT("<"), wxT("&lt;"), true);
    doc.Replace(wxT(">"), wxT("&gt;"), 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
Commit	Line	Data
5526e819	1	/////////////////////////////////////////////////////////////////////////////
69941f05	2	// Name: htmlfilt.cpp
5526e819 VS	3	// Purpose: wxHtmlFilter - input filter for translating into HTML format
5526e819 VS	4	// Author: Vaclav Slavik
69941f05	5	// RCS-ID: $Id$
5526e819	6	// Copyright: (c) 1999 Vaclav Slavik
65571936	7	// Licence: wxWindows licence
5526e819 VS	8	/////////////////////////////////////////////////////////////////////////////
5526e819 VS	9
4dcaf11a	10	#include "wx/wxprec.h"
5526e819	11
314260fb	12	#include "wx/defs.h"
f6bcfd97	13	#if wxUSE_HTML && wxUSE_STREAMS
5526e819	14
2b5f62a0	15	#ifdef __BORLANDC__
5526e819 VS	16	#pragma hdrstop
	17	#endif
	18
	19	#ifndef WXPRECOMP
04dbb646 VZ	20	#include "wx/log.h"
04dbb646 VZ	21	#include "wx/intl.h"
5526e819 VS	22	#endif
5526e819 VS	23
2b5f62a0	24	#include "wx/strconv.h"
69941f05	25	#include "wx/html/htmlfilt.h"
4dcaf11a	26	#include "wx/html/htmlwin.h"
5526e819	27
eb37e1d2	28	// utility function: read a wxString from a wxInputStream
2b5f62a0	29	static void ReadString(wxString& str, wxInputStream* s, wxMBConv& conv)
eb37e1d2 MB	30	{
	31	size_t streamSize = s->GetSize();
	32
2b5f62a0	33	if (streamSize == ~(size_t)0)
eb37e1d2 MB	34	{
	35	const size_t bufSize = 4095;
	36	char buffer[bufSize+1];
	37	size_t lastRead;
	38
	39	do
	40	{
	41	s->Read(buffer, bufSize);
	42	lastRead = s->LastRead();
	43	buffer[lastRead] = 0;
2b5f62a0	44	str.Append(wxString(buffer, conv));
eb37e1d2	45	}
2b5f62a0	46	while (lastRead == bufSize);
eb37e1d2 MB	47	}
	48	else
	49	{
	50	char* src = new char[streamSize+1];
	51	s->Read(src, streamSize);
	52	src[streamSize] = 0;
2b5f62a0 VZ	53	str = wxString(src, conv);
2b5f62a0 VZ	54	delete[] src;
eb37e1d2 MB	55	}
eb37e1d2 MB	56	}
5526e819 VS	57
	58	/*
	59
	60	There is code for several default filters:
	61
	62	*/
	63
	64	IMPLEMENT_ABSTRACT_CLASS(wxHtmlFilter, wxObject)
	65
	66	//--------------------------------------------------------------------------------
	67	// wxHtmlFilterPlainText
	68	// filter for text/plain or uknown
	69	//--------------------------------------------------------------------------------
	70
	71	IMPLEMENT_DYNAMIC_CLASS(wxHtmlFilterPlainText, wxHtmlFilter)
	72
a4c97004	73	bool wxHtmlFilterPlainText::CanRead(const wxFSFile& WXUNUSED(file)) const
5526e819	74	{
d1da8872	75	return true;
5526e819 VS	76	}
	77
	78
	79
420ec58a	80	wxString wxHtmlFilterPlainText::ReadFile(const wxFSFile& file) const
5526e819 VS	81	{
5526e819 VS	82	wxInputStream *s = file.GetStream();
5526e819 VS	83	wxString doc, doc2;
	84
	85	if (s == NULL) return wxEmptyString;
2b5f62a0	86	ReadString(doc, s, wxConvISO8859_1);
5526e819	87
d1da8872 WS	88	doc.Replace(wxT("&"), wxT("&"), true);
	89	doc.Replace(wxT("<"), wxT("<"), true);
	90	doc.Replace(wxT(">"), wxT(">"), true);
2b5f62a0	91	doc2 = wxT("<HTML><BODY><PRE>\n") + doc + wxT("\n</PRE></BODY></HTML>");
5526e819 VS	92	return doc2;
	93	}
	94
	95
	96
	97
	98
	99	//--------------------------------------------------------------------------------
	100	// wxHtmlFilterImage
	101	// filter for image/*
	102	//--------------------------------------------------------------------------------
	103
	104	class wxHtmlFilterImage : public wxHtmlFilter
	105	{
	106	DECLARE_DYNAMIC_CLASS(wxHtmlFilterImage)
	107
	108	public:
420ec58a VS	109	virtual bool CanRead(const wxFSFile& file) const;
420ec58a VS	110	virtual wxString ReadFile(const wxFSFile& file) const;
5526e819 VS	111	};
	112
	113	IMPLEMENT_DYNAMIC_CLASS(wxHtmlFilterImage, wxHtmlFilter)
	114
	115
	116
420ec58a	117	bool wxHtmlFilterImage::CanRead(const wxFSFile& file) const
5526e819	118	{
0413cec5	119	return (file.GetMimeType().Left(6) == wxT("image/"));
5526e819 VS	120	}
	121
	122
	123
420ec58a	124	wxString wxHtmlFilterImage::ReadFile(const wxFSFile& file) const
5526e819	125	{
2b5f62a0 VZ	126	wxString res = wxT("<HTML><BODY><IMG SRC=\"") + file.GetLocation() + wxT("\"></BODY></HTML>");
2b5f62a0 VZ	127	return res;
5526e819 VS	128	}
	129
	130
	131
	132
	133	//--------------------------------------------------------------------------------
2b5f62a0 VZ	134	// wxHtmlFilterHTML
2b5f62a0 VZ	135	// filter for text/html
5526e819 VS	136	//--------------------------------------------------------------------------------
5526e819 VS	137
5526e819 VS	138
	139	IMPLEMENT_DYNAMIC_CLASS(wxHtmlFilterHTML, wxHtmlFilter)
	140
420ec58a	141	bool wxHtmlFilterHTML::CanRead(const wxFSFile& file) const
5526e819	142	{
f61815af GL	143	// return (file.GetMimeType() == "text/html");
	144	// This is true in most case but some page can return:
	145	// "text/html; char-encoding=...."
	146	// So we use Find instead
77611ad4	147	return (file.GetMimeType().Find(wxT("text/html")) == 0);
5526e819 VS	148	}
	149
	150
	151
420ec58a	152	wxString wxHtmlFilterHTML::ReadFile(const wxFSFile& file) const
5526e819 VS	153	{
5526e819 VS	154	wxInputStream *s = file.GetStream();
5526e819 VS	155	wxString doc;
5526e819 VS	156
04dbb646	157	if (s == NULL)
f3c82859	158	{
f6bcfd97	159	wxLogError(_("Cannot open HTML document: %s"), file.GetLocation().c_str());
f3c82859 VS	160	return wxEmptyString;
f3c82859 VS	161	}
5526e819	162
d1da8872	163	// NB: We convert input file to wchar_t here in Unicode mode, based on
2b5f62a0 VZ	164	// either Content-Type header or <meta> tags. In ANSI mode, we don't
	165	// do it as it is done by wxHtmlParser (for this reason, we add <meta>
	166	// tag if we used Content-Type header).
	167	#if wxUSE_UNICODE
d1da8872	168	int charsetPos;
2b5f62a0 VZ	169	if ((charsetPos = file.GetMimeType().Find(_T("; charset="))) != wxNOT_FOUND)
	170	{
	171	wxString charset = file.GetMimeType().Mid(charsetPos + 10);
	172	wxCSConv conv(charset);
	173	ReadString(doc, s, conv);
	174	}
	175	else
	176	{
	177	wxString tmpdoc;
	178	ReadString(tmpdoc, s, wxConvISO8859_1);
	179	wxString charset = wxHtmlParser::ExtractCharsetInformation(tmpdoc);
	180	if (charset.empty())
	181	doc = tmpdoc;
	182	else
	183	{
	184	wxCSConv conv(charset);
	185	doc = wxString(tmpdoc.mb_str(wxConvISO8859_1), conv);
	186	}
	187	}
	188	#else // !wxUSE_UNICODE
	189	ReadString(doc, s, wxConvLibc);
04dbb646	190	// add meta tag if we obtained this through http:
2b5f62a0	191	if (!file.GetMimeType().empty())
981e62aa	192	{
2b5f62a0 VZ	193	wxString hdr;
	194	wxString mime = file.GetMimeType();
	195	hdr.Printf(_T("<meta http-equiv=\"Content-Type\" content=\"%s\">"), mime.c_str());
	196	return hdr+doc;
981e62aa	197	}
2b5f62a0	198	#endif
981e62aa	199
3ca6a5f0	200	return doc;
5526e819 VS	201	}
	202
	203
	204
	205
	206	///// Module:
	207
	208	class wxHtmlFilterModule : public wxModule
	209	{
	210	DECLARE_DYNAMIC_CLASS(wxHtmlFilterModule)
	211
	212	public:
	213	virtual bool OnInit()
	214	{
	215	wxHtmlWindow::AddFilter(new wxHtmlFilterHTML);
	216	wxHtmlWindow::AddFilter(new wxHtmlFilterImage);
d1da8872	217	return true;
5526e819 VS	218	}
	219	virtual void OnExit() {}
	220	};
	221
	222	IMPLEMENT_DYNAMIC_CLASS(wxHtmlFilterModule, wxModule)
	223
8dd71e2b	224	#endif