X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/367c84b903487509202a6d8d9e847892bcf1b832..ebdb3bc7e06d54e06c8415f10277a093a4a1e4df:/src/html/htmlpars.cpp

diff --git a/src/html/htmlpars.cpp b/src/html/htmlpars.cpp
index 1b9c06726d..7efb69af34 100644
--- a/src/html/htmlpars.cpp
+++ b/src/html/htmlpars.cpp
@@ -1,28 +1,25 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        htmlpars.cpp
+// Name:        src/html/htmlpars.cpp
 // Purpose:     wxHtmlParser class (generic parser)
 // Author:      Vaclav Slavik
 // RCS-ID:      $Id$
 // Copyright:   (c) 1999 Vaclav Slavik
-// Licence:     wxWindows Licence
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
+#include "wx/wxprec.h"
 
-#ifdef __GNUG__
-#pragma implementation
+#ifdef __BORLANDC__
+    #pragma hdrstop
 #endif
 
-#include "wx/wxprec.h"
-
-#include "wx/defs.h"
 #if wxUSE_HTML && wxUSE_STREAMS
 
-#ifdef __BORDLANDC__
-#pragma hdrstop
-#endif
-
 #ifndef WXPRECOMP
-#include "wx/wx.h"
+    #include "wx/dynarray.h"
+    #include "wx/log.h"
+    #include "wx/intl.h"
+    #include "wx/app.h"
 #endif
 
 #include "wx/tokenzr.h"
@@ -31,8 +28,41 @@
 #include "wx/fontmap.h"
 #include "wx/html/htmldefs.h"
 #include "wx/html/htmlpars.h"
+#include "wx/arrimpl.cpp"
 
+#ifdef __WXWINCE__
+    #include "wx/msw/wince/missing.h"       // for bsearch()
+#endif
+
+// DLL options compatibility check:
+WX_CHECK_BUILD_OPTIONS("wxHTML")
 
+const wxChar *wxTRACE_HTML_DEBUG = _T("htmldebug");
+
+//-----------------------------------------------------------------------------
+// wxHtmlParser helpers
+//-----------------------------------------------------------------------------
+
+class wxHtmlTextPiece
+{
+public:
+    wxHtmlTextPiece(int pos, int lng) : m_pos(pos), m_lng(lng) {}
+    int m_pos, m_lng;
+};
+
+WX_DECLARE_OBJARRAY(wxHtmlTextPiece, wxHtmlTextPieces);
+WX_DEFINE_OBJARRAY(wxHtmlTextPieces)
+
+class wxHtmlParserState
+{
+public:
+    wxHtmlTag         *m_curTag;
+    wxHtmlTag         *m_tags;
+    wxHtmlTextPieces  *m_textPieces;
+    int                m_curTextPiece;
+    wxString           m_source;
+    wxHtmlParserState *m_nextState;
+};
 
 //-----------------------------------------------------------------------------
 // wxHtmlParser
@@ -40,29 +70,42 @@
 
 IMPLEMENT_ABSTRACT_CLASS(wxHtmlParser,wxObject)
 
-wxHtmlParser::wxHtmlParser() 
-    : wxObject(), m_Cache(NULL), m_HandlersHash(wxKEY_STRING), 
+wxHtmlParser::wxHtmlParser()
+    : wxObject(), m_HandlersHash(wxKEY_STRING),
       m_FS(NULL), m_HandlersStack(NULL)
 {
     m_entitiesParser = new wxHtmlEntitiesParser;
+    m_Tags = NULL;
+    m_CurTag = NULL;
+    m_TextPieces = NULL;
+    m_CurTextPiece = 0;
+    m_SavedStates = NULL;
 }
 
 wxHtmlParser::~wxHtmlParser()
 {
+    while (RestoreState()) {}
+    DestroyDOMTree();
+
+    if (m_HandlersStack)
+    {
+        wxList& tmp = *m_HandlersStack;
+        wxList::iterator it, en;
+        for( it = tmp.begin(), en = tmp.end(); it != en; ++it )
+            delete (wxHashTable*)*it;
+        tmp.clear();
+    }
     delete m_HandlersStack;
     m_HandlersHash.Clear();
-    m_HandlersList.DeleteContents(TRUE);
-    m_HandlersList.Clear();
+    WX_CLEAR_LIST(wxList, m_HandlersList);
     delete m_entitiesParser;
 }
 
 wxObject* wxHtmlParser::Parse(const wxString& source)
 {
-    wxObject *result;
-
     InitParser(source);
     DoParsing();
-    result = GetProduct();
+    wxObject *result = GetProduct();
     DoneParser();
     return result;
 }
@@ -70,77 +113,223 @@ wxObject* wxHtmlParser::Parse(const wxString& source)
 void wxHtmlParser::InitParser(const wxString& source)
 {
     SetSource(source);
+    m_stopParsing = false;
 }
 
 void wxHtmlParser::DoneParser()
 {
-    delete m_Cache;
-    m_Cache = NULL;
+    DestroyDOMTree();
 }
 
 void wxHtmlParser::SetSource(const wxString& src)
 {
+    DestroyDOMTree();
     m_Source = src;
-    delete m_Cache;
-    m_Cache = new wxHtmlTagsCache(m_Source);
+    CreateDOMTree();
+    m_CurTag = NULL;
+    m_CurTextPiece = 0;
 }
 
-void wxHtmlParser::DoParsing(int begin_pos, int end_pos)
+void wxHtmlParser::CreateDOMTree()
+{
+    wxHtmlTagsCache cache(m_Source);
+    m_TextPieces = new wxHtmlTextPieces;
+    CreateDOMSubTree(NULL, 0, m_Source.length(), &cache);
+    m_CurTextPiece = 0;
+}
+
+extern bool wxIsCDATAElement(const wxChar *tag);
+
+void wxHtmlParser::CreateDOMSubTree(wxHtmlTag *cur,
+                                    int begin_pos, int end_pos,
+                                    wxHtmlTagsCache *cache)
 {
     if (end_pos <= begin_pos) return;
 
-    char c;
-    char *temp = new char[end_pos - begin_pos + 1];
-    int i;
-    int templen;
+    wxChar c;
+    int i = begin_pos;
+    int textBeginning = begin_pos;
 
-    templen = 0;
-    i = begin_pos;
+    // If the tag contains CDATA text, we include the text between beginning
+    // and ending tag verbosely. Setting i=end_pos will skip to the very
+    // end of this function where text piece is added, bypassing any child
+    // tags parsing (CDATA element can't have child elements by definition):
+    if (cur != NULL && wxIsCDATAElement(cur->GetName().c_str()))
+    {
+        i = end_pos;
+    }
 
-    while (i < end_pos) 
+    while (i < end_pos)
     {
-        c = m_Source[(unsigned int) i];
+        c = m_Source.GetChar(i);
 
-        // continue building word:
-        if (c != '<') 
-	    {
-            temp[templen++] = c;
-            i++;
-        }
+        if (c == wxT('<'))
+        {
+            // add text to m_TextPieces:
+            if (i - textBeginning > 0)
+                m_TextPieces->Add(
+                    wxHtmlTextPiece(textBeginning, i - textBeginning));
+
+            // if it is a comment, skip it:
+            if (i < end_pos-6 && m_Source.GetChar(i+1) == wxT('!') &&
+                                 m_Source.GetChar(i+2) == wxT('-') &&
+                                 m_Source.GetChar(i+3) == wxT('-'))
+            {
+                // Comments begin with "<!--" and end with "--[ \t\r\n]*>"
+                // according to HTML 4.0
+                int dashes = 0;
+                i += 4;
+                while (i < end_pos)
+                {
+                    c = m_Source.GetChar(i++);
+                    if ((c == wxT(' ') || c == wxT('\n') ||
+                        c == wxT('\r') || c == wxT('\t')) && dashes >= 2) {}
+                    else if (c == wxT('>') && dashes >= 2)
+                    {
+                        textBeginning = i;
+                        break;
+                    }
+                    else if (c == wxT('-'))
+                        dashes++;
+                    else
+                        dashes = 0;
+                }
+            }
 
-        else if (c == '<')  
-	    {
-            wxHtmlTag tag(m_Source, i, end_pos, m_Cache, m_entitiesParser);
+            // add another tag to the tree:
+            else if (i < end_pos-1 && m_Source.GetChar(i+1) != wxT('/'))
+            {
+                wxHtmlTag *chd;
+                if (cur)
+                    chd = new wxHtmlTag(cur, m_Source,
+                                        i, end_pos, cache, m_entitiesParser);
+                else
+                {
+                    chd = new wxHtmlTag(NULL, m_Source,
+                                        i, end_pos, cache, m_entitiesParser);
+                    if (!m_Tags)
+                    {
+                        // if this is the first tag to be created make the root
+                        // m_Tags point to it:
+                        m_Tags = chd;
+                    }
+                    else
+                    {
+                        // if there is already a root tag add this tag as
+                        // the last sibling:
+                        chd->m_Prev = m_Tags->GetLastSibling();
+                        chd->m_Prev->m_Next = chd;
+                    }
+                }
+
+                if (chd->HasEnding())
+                {
+                    CreateDOMSubTree(chd,
+                                     chd->GetBeginPos(), chd->GetEndPos1(),
+                                     cache);
+                    i = chd->GetEndPos2();
+                }
+                else
+                    i = chd->GetBeginPos();
+
+                textBeginning = i;
+            }
 
-            if (templen) 
-	        {
-                temp[templen] = 0;
-                AddText(temp);
-                templen = 0;
+            // ... or skip ending tag:
+            else
+            {
+                while (i < end_pos && m_Source.GetChar(i) != wxT('>')) i++;
+                textBeginning = i+1;
             }
-            AddTag(tag);
-            if (tag.HasEnding()) i = tag.GetEndPos2();
-            else i = tag.GetBeginPos();
         }
+        else i++;
     }
 
-    if (templen) 
-    { // last word of block :-(
-        temp[templen] = 0;
-        AddText(temp);
+    // add remaining text to m_TextPieces:
+    if (end_pos - textBeginning > 0)
+        m_TextPieces->Add(
+            wxHtmlTextPiece(textBeginning, end_pos - textBeginning));
+}
+
+void wxHtmlParser::DestroyDOMTree()
+{
+    wxHtmlTag *t1, *t2;
+    t1 = m_Tags;
+    while (t1)
+    {
+        t2 = t1->GetNextSibling();
+        delete t1;
+        t1 = t2;
+    }
+    m_Tags = m_CurTag = NULL;
+
+    delete m_TextPieces;
+    m_TextPieces = NULL;
+}
+
+void wxHtmlParser::DoParsing()
+{
+    m_CurTag = m_Tags;
+    m_CurTextPiece = 0;
+    DoParsing(0, m_Source.length());
+}
+
+void wxHtmlParser::DoParsing(int begin_pos, int end_pos)
+{
+    if (end_pos <= begin_pos) return;
+
+    wxHtmlTextPieces& pieces = *m_TextPieces;
+    size_t piecesCnt = pieces.GetCount();
+
+    while (begin_pos < end_pos)
+    {
+        while (m_CurTag && m_CurTag->GetBeginPos() < begin_pos)
+            m_CurTag = m_CurTag->GetNextTag();
+        while (m_CurTextPiece < piecesCnt &&
+               pieces[m_CurTextPiece].m_pos < begin_pos)
+            m_CurTextPiece++;
+
+        if (m_CurTextPiece < piecesCnt &&
+            (!m_CurTag ||
+             pieces[m_CurTextPiece].m_pos < m_CurTag->GetBeginPos()))
+        {
+            // Add text:
+            AddText(GetEntitiesParser()->Parse(
+                       m_Source.Mid(pieces[m_CurTextPiece].m_pos,
+                                    pieces[m_CurTextPiece].m_lng)));
+            begin_pos = pieces[m_CurTextPiece].m_pos +
+                        pieces[m_CurTextPiece].m_lng;
+            m_CurTextPiece++;
+        }
+        else if (m_CurTag)
+        {
+            if (m_CurTag->HasEnding())
+                begin_pos = m_CurTag->GetEndPos2();
+            else
+                begin_pos = m_CurTag->GetBeginPos();
+            wxHtmlTag *t = m_CurTag;
+            m_CurTag = m_CurTag->GetNextTag();
+            AddTag(*t);
+            if (m_stopParsing)
+                return;
+        }
+        else break;
     }
-    delete[] temp;
 }
 
 void wxHtmlParser::AddTag(const wxHtmlTag& tag)
 {
     wxHtmlTagHandler *h;
-    bool inner = FALSE;
+    bool inner = false;
 
     h = (wxHtmlTagHandler*) m_HandlersHash.Get(tag.GetName());
     if (h)
+    {
         inner = h->HandleTag(tag);
-    if (!inner) 
+        if (m_stopParsing)
+            return;
+    }
+    if (!inner)
     {
         if (tag.HasEnding())
             DoParsing(tag.GetBeginPos(), tag.GetEndPos1());
@@ -150,10 +339,10 @@ void wxHtmlParser::AddTag(const wxHtmlTag& tag)
 void wxHtmlParser::AddTagHandler(wxHtmlTagHandler *handler)
 {
     wxString s(handler->GetSupportedTags());
-    wxStringTokenizer tokenizer(s, ", ");
+    wxStringTokenizer tokenizer(s, wxT(", "));
 
     while (tokenizer.HasMoreTokens())
-        m_HandlersHash.Put(tokenizer.NextToken(), handler);
+        m_HandlersHash.Put(tokenizer.GetNextToken(), handler);
 
     if (m_HandlersList.IndexOf(handler) == wxNOT_FOUND)
         m_HandlersList.Append(handler);
@@ -161,22 +350,21 @@ void wxHtmlParser::AddTagHandler(wxHtmlTagHandler *handler)
     handler->SetParser(this);
 }
 
-void wxHtmlParser::PushTagHandler(wxHtmlTagHandler *handler, wxString tags)
+void wxHtmlParser::PushTagHandler(wxHtmlTagHandler *handler, const wxString& tags)
 {
-    wxStringTokenizer tokenizer(tags, ", ");
+    wxStringTokenizer tokenizer(tags, wxT(", "));
     wxString key;
 
-    if (m_HandlersStack == NULL) 
+    if (m_HandlersStack == NULL)
     {
         m_HandlersStack = new wxList;
-        m_HandlersStack->DeleteContents(TRUE);
     }
 
-    m_HandlersStack->Insert(new wxHashTable(m_HandlersHash));
+    m_HandlersStack->Insert((wxObject*)new wxHashTable(m_HandlersHash));
 
-    while (tokenizer.HasMoreTokens()) 
+    while (tokenizer.HasMoreTokens())
     {
-        key = tokenizer.NextToken();
+        key = tokenizer.GetNextToken();
         m_HandlersHash.Delete(key);
         m_HandlersHash.Put(key, handler);
     }
@@ -184,16 +372,69 @@ void wxHtmlParser::PushTagHandler(wxHtmlTagHandler *handler, wxString tags)
 
 void wxHtmlParser::PopTagHandler()
 {
-    wxNode *first;
-    
-    if (m_HandlersStack == NULL || 
-        (first = m_HandlersStack->GetFirst()) == NULL) 
+    wxList::compatibility_iterator first;
+
+    if ( !m_HandlersStack ||
+#if wxUSE_STL
+         !(first = m_HandlersStack->GetFirst())
+#else // !wxUSE_STL
+         ((first = m_HandlersStack->GetFirst()) == NULL)
+#endif // wxUSE_STL/!wxUSE_STL
+        )
     {
         wxLogWarning(_("Warning: attempt to remove HTML tag handler from empty stack."));
         return;
     }
     m_HandlersHash = *((wxHashTable*) first->GetData());
-    m_HandlersStack->DeleteNode(first);
+    delete (wxHashTable*) first->GetData();
+    m_HandlersStack->Erase(first);
+}
+
+void wxHtmlParser::SetSourceAndSaveState(const wxString& src)
+{
+    wxHtmlParserState *s = new wxHtmlParserState;
+
+    s->m_curTag = m_CurTag;
+    s->m_tags = m_Tags;
+    s->m_textPieces = m_TextPieces;
+    s->m_curTextPiece = m_CurTextPiece;
+    s->m_source = m_Source;
+
+    s->m_nextState = m_SavedStates;
+    m_SavedStates = s;
+
+    m_CurTag = NULL;
+    m_Tags = NULL;
+    m_TextPieces = NULL;
+    m_CurTextPiece = 0;
+    m_Source = wxEmptyString;
+
+    SetSource(src);
+}
+
+bool wxHtmlParser::RestoreState()
+{
+    if (!m_SavedStates) return false;
+
+    DestroyDOMTree();
+
+    wxHtmlParserState *s = m_SavedStates;
+    m_SavedStates = s->m_nextState;
+
+    m_CurTag = s->m_curTag;
+    m_Tags = s->m_tags;
+    m_TextPieces = s->m_textPieces;
+    m_CurTextPiece = s->m_curTextPiece;
+    m_Source = s->m_source;
+
+    delete s;
+    return true;
+}
+
+wxString wxHtmlParser::GetInnerSource(const wxHtmlTag& tag)
+{
+    return GetSource()->Mid(tag.GetBeginPos(),
+                            tag.GetEndPos1() - tag.GetBeginPos());
 }
 
 //-----------------------------------------------------------------------------
@@ -202,6 +443,15 @@ void wxHtmlParser::PopTagHandler()
 
 IMPLEMENT_ABSTRACT_CLASS(wxHtmlTagHandler,wxObject)
 
+void wxHtmlTagHandler::ParseInnerSource(const wxString& source)
+{
+    // It is safe to temporarily change the source being parsed,
+    // provided we restore the state back after parsing
+    m_Parser->SetSourceAndSaveState(source);
+    m_Parser->DoParsing();
+    m_Parser->RestoreState();
+}
+
 
 //-----------------------------------------------------------------------------
 // wxHtmlEntitiesParser
@@ -218,18 +468,26 @@ wxHtmlEntitiesParser::wxHtmlEntitiesParser()
 
 wxHtmlEntitiesParser::~wxHtmlEntitiesParser()
 {
+#if wxUSE_WCHAR_T && !wxUSE_UNICODE
     delete m_conv;
+#endif
 }
 
 void wxHtmlEntitiesParser::SetEncoding(wxFontEncoding encoding)
 {
 #if wxUSE_WCHAR_T && !wxUSE_UNICODE
-    if (encoding == m_encoding) return;
+    if (encoding == m_encoding)
+        return;
+
     delete m_conv;
-    m_conv = NULL;
+
     m_encoding = encoding;
-    if (m_encoding != wxFONTENCODING_SYSTEM)
+    if (m_encoding == wxFONTENCODING_SYSTEM)
+        m_conv = NULL;
+    else
         m_conv = new wxCSConv(wxFontMapper::GetEncodingName(m_encoding));
+#else
+    (void) encoding;
 #endif
 }
 
@@ -238,24 +496,39 @@ wxString wxHtmlEntitiesParser::Parse(const wxString& input)
     const wxChar *c, *last;
     const wxChar *in_str = input.c_str();
     wxString output;
-    
+
+    output.reserve(input.length());
+
     for (c = in_str, last = in_str; *c != wxT('\0'); c++)
     {
         if (*c == wxT('&'))
         {
             if (c - last > 0)
                 output.append(last, c - last);
-            if (++c == wxT('\0')) break;
+            if ( *++c == wxT('\0') )
+                break;
+
             wxString entity;
             const wxChar *ent_s = c;
+            wxChar entity_char;
+
             for (; (*c >= wxT('a') && *c <= wxT('z')) ||
                    (*c >= wxT('A') && *c <= wxT('Z')) ||
                    (*c >= wxT('0') && *c <= wxT('9')) ||
                    *c == wxT('_') || *c == wxT('#'); c++) {}
             entity.append(ent_s, c - ent_s);
-            if (*c == wxT(';')) c++;
-            output << GetEntityChar(entity);
-            last = c;
+            if (*c != wxT(';')) c--;
+            last = c+1;
+            entity_char = GetEntityChar(entity);
+            if (entity_char)
+                output << entity_char;
+            else
+            {
+                output.append(ent_s-1, c-ent_s+2);
+                wxLogTrace(wxTRACE_HTML_DEBUG,
+                           wxT("Unrecognized HTML entity: '%s'"),
+                           entity.c_str());
+            }
         }
     }
     if (*last != wxT('\0'))
@@ -269,38 +542,38 @@ struct wxHtmlEntityInfo
     unsigned code;
 };
 
-static int compar_entity(const void *key, const void *item)
+extern "C" int LINKAGEMODE wxHtmlEntityCompare(const void *key, const void *item)
 {
     return wxStrcmp((wxChar*)key, ((wxHtmlEntityInfo*)item)->name);
 }
 
+#if !wxUSE_UNICODE
 wxChar wxHtmlEntitiesParser::GetCharForCode(unsigned code)
 {
-#if wxUSE_UNICODE
-    return (wxChar)code;
-#elif wxUSE_WCHAR_T
+#if wxUSE_WCHAR_T
     char buf[2];
     wchar_t wbuf[2];
     wbuf[0] = (wchar_t)code;
     wbuf[1] = 0;
     wxMBConv *conv = m_conv ? m_conv : &wxConvLocal;
-    if (conv->WC2MB(buf, wbuf, 1) == (size_t)-1)
+    if (conv->WC2MB(buf, wbuf, 2) == (size_t)-1)
         return '?';
     return buf[0];
 #else
     return (code < 256) ? (wxChar)code : '?';
 #endif
 }
+#endif
 
 wxChar wxHtmlEntitiesParser::GetEntityChar(const wxString& entity)
 {
     unsigned code = 0;
-    
+
     if (entity[0] == wxT('#'))
     {
         const wxChar *ent_s = entity.c_str();
         const wxChar *format;
-        
+
         if (ent_s[1] == wxT('x') || ent_s[1] == wxT('X'))
         {
             format = wxT("%x");
@@ -570,24 +843,112 @@ wxChar wxHtmlEntitiesParser::GetEntityChar(const wxString& entity)
             { wxT("zwnj"),8204 },
             {NULL, 0}};
         static size_t substitutions_cnt = 0;
-        
+
         if (substitutions_cnt == 0)
             while (substitutions[substitutions_cnt].code != 0)
                 substitutions_cnt++;
 
-        wxHtmlEntityInfo *info;
-        info = (wxHtmlEntityInfo*) bsearch(entity.c_str(), substitutions, 
+        wxHtmlEntityInfo *info = NULL;
+#ifdef __WXWINCE__
+        // bsearch crashes under WinCE for some reason
+        size_t i;
+        for (i = 0; i < substitutions_cnt; i++)
+        {
+            if (entity == substitutions[i].name)
+            {
+                info = & substitutions[i];
+                break;
+            }
+        }
+#else
+        info = (wxHtmlEntityInfo*) bsearch(entity.c_str(), substitutions,
                                            substitutions_cnt,
                                            sizeof(wxHtmlEntityInfo),
-                                           compar_entity);
+                                           wxHtmlEntityCompare);
+#endif
         if (info)
             code = info->code;
     }
-    
+
     if (code == 0)
-        return wxT('?');
+        return 0;
     else
         return GetCharForCode(code);
 }
 
+wxFSFile *wxHtmlParser::OpenURL(wxHtmlURLType WXUNUSED(type),
+                                const wxString& url) const
+{
+    return m_FS ? m_FS->OpenFile(url) : NULL;
+
+}
+
+
+//-----------------------------------------------------------------------------
+// wxHtmlParser::ExtractCharsetInformation
+//-----------------------------------------------------------------------------
+
+class wxMetaTagParser : public wxHtmlParser
+{
+public:
+    wxMetaTagParser() { }
+
+    wxObject* GetProduct() { return NULL; }
+
+protected:
+    virtual void AddText(const wxChar* WXUNUSED(txt)) {}
+
+    DECLARE_NO_COPY_CLASS(wxMetaTagParser)
+};
+
+class wxMetaTagHandler : public wxHtmlTagHandler
+{
+public:
+    wxMetaTagHandler(wxString *retval) : wxHtmlTagHandler(), m_retval(retval) {}
+    wxString GetSupportedTags() { return wxT("META,BODY"); }
+    bool HandleTag(const wxHtmlTag& tag);
+
+private:
+    wxString *m_retval;
+
+    DECLARE_NO_COPY_CLASS(wxMetaTagHandler)
+};
+
+bool wxMetaTagHandler::HandleTag(const wxHtmlTag& tag)
+{
+    if (tag.GetName() == _T("BODY"))
+    {
+        m_Parser->StopParsing();
+        return false;
+    }
+
+    if (tag.HasParam(_T("HTTP-EQUIV")) &&
+        tag.GetParam(_T("HTTP-EQUIV")).IsSameAs(_T("Content-Type"), false) &&
+        tag.HasParam(_T("CONTENT")))
+    {
+        wxString content = tag.GetParam(_T("CONTENT")).Lower();
+        if (content.Left(19) == _T("text/html; charset="))
+        {
+            *m_retval = content.Mid(19);
+            m_Parser->StopParsing();
+        }
+    }
+    return false;
+}
+
+
+/*static*/
+wxString wxHtmlParser::ExtractCharsetInformation(const wxString& markup)
+{
+    wxString charset;
+    wxMetaTagParser *parser = new wxMetaTagParser();
+    if(parser)
+    {
+        parser->AddTagHandler(new wxMetaTagHandler(&charset));
+        parser->Parse(markup);
+        delete parser;
+    }
+    return charset;
+}
+
 #endif