Add backend descriptions for all backends to the documentation.

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

diff --git a/src/html/htmltag.cpp b/src/html/htmltag.cpp
index 8801b152279de43a970bb59962f44314e813fe1c..fdc71fe1710063e3212f899891ceaddb31a95973 100644 (file)
--- a/src/html/htmltag.cpp
+++ b/src/html/htmltag.cpp
@@ -1,36 +1,35 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        htmltag.cpp
+// Name:        src/html/htmltag.cpp

 // Purpose:     wxHtmlTag class (represents single tag)
 // Author:      Vaclav Slavik
 // RCS-ID:      $Id$
 // Copyright:   (c) 1999 Vaclav Slavik
 // Purpose:     wxHtmlTag class (represents single tag)
 // 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
 
 #endif
 

-#include "wx/wxprec.h"
-
-#include "wx/defs.h"

 #if wxUSE_HTML
 
 #if wxUSE_HTML
 

-#ifdef __BORDLANDC__
-#pragma hdrstop
-#endif
+#include "wx/html/htmltag.h"

 
 

-#ifndef WXPRECOMP
-#include "wx/wx.h"
+#ifndef WX_PRECOMP
+    #include "wx/colour.h"
+    #include "wx/wxcrtvararg.h"

 #endif
 
 #endif
 

-#include "wx/html/htmltag.h"

 #include "wx/html/htmlpars.h"
 #include "wx/html/htmlpars.h"

+#include "wx/html/styleparams.h"
+
+#include "wx/vector.h"
+

 #include <stdio.h> // for vsscanf
 #include <stdarg.h>
 
 #include <stdio.h> // for vsscanf
 #include <stdarg.h>
 

-

 //-----------------------------------------------------------------------------
 // wxHtmlTagsCache
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 // wxHtmlTagsCache
 //-----------------------------------------------------------------------------


@@ -39,103 +38,255 @@ struct wxHtmlCacheItem
 {
     // this is "pos" value passed to wxHtmlTag's constructor.
     // it is position of '<' character of the tag
 {
     // this is "pos" value passed to wxHtmlTag's constructor.
     // it is position of '<' character of the tag

-    int Key;
+    wxString::const_iterator Key;
+
+    // Tag type
+    enum Type
+    {
+        Type_Normal, // normal tag with a matching ending tag
+        Type_NoMatchingEndingTag, // there's no ending tag for this tag
+        Type_EndingTag // this is ending tag </..>
+    };
+    Type type;

 
     // end positions for the tag:
     // end1 is '<' of ending tag,
     // end2 is '>' or both are
 
     // end positions for the tag:
     // end1 is '<' of ending tag,
     // end2 is '>' or both are

-    // -1 if there is no ending tag for this one...
-    // or -2 if this is ending tag  </...>
-    int End1, End2;
+    wxString::const_iterator End1, End2;

 
     // name of this tag
     wxChar *Name;
 };
 
 
     // name of this tag
     wxChar *Name;
 };
 

+// NB: this is an empty class and not typedef because of forward declaration
+class wxHtmlTagsCacheData : public wxVector<wxHtmlCacheItem>
+{
+};

 
 

-IMPLEMENT_CLASS(wxHtmlTagsCache,wxObject)
+bool wxIsCDATAElement(const wxChar *tag)
+{
+    return (wxStrcmp(tag, wxT("SCRIPT")) == 0) ||
+           (wxStrcmp(tag, wxT("STYLE")) == 0);
+}

 
 

-#define CACHE_INCREMENT  64
+bool wxIsCDATAElement(const wxString& tag)
+{
+    return (wxStrcmp(tag.wx_str(), wxS("SCRIPT")) == 0) ||
+           (wxStrcmp(tag.wx_str(), wxS("STYLE")) == 0);
+}

 
 wxHtmlTagsCache::wxHtmlTagsCache(const wxString& source)
 {
 
 wxHtmlTagsCache::wxHtmlTagsCache(const wxString& source)
 {

-    const wxChar *src = source.c_str();
-    int i, tg, pos, stpos;
-    int lng = source.Length();
-    wxChar dummy[256];
-
-    m_Cache = NULL;
-    m_CacheSize = 0;
+    m_Cache = new wxHtmlTagsCacheData;

     m_CachePos = 0;
 
     m_CachePos = 0;
 

-    pos = 0;
-    while (pos < lng) 
+    wxChar tagBuffer[256];
+
+    const wxString::const_iterator end = source.end();
+    for ( wxString::const_iterator pos = source.begin(); pos < end; ++pos )

     {
     {

-        if (src[pos] == wxT('<'))   // tag found:
+        if (*pos != wxT('<'))
+            continue;
+
+        // possible tag start found:
+
+        // don't cache comment tags
+        if ( wxHtmlParser::SkipCommentTag(pos, end) )
+            continue;
+
+        // Remember the starting tag position.
+        wxString::const_iterator stpos = pos++;
+
+        // And look for the ending one.
+        int i;
+        for ( i = 0;
+              pos < end && i < (int)WXSIZEOF(tagBuffer) - 1 &&
+              *pos != wxT('>') && !wxIsspace(*pos);
+              ++i, ++pos )

         {
         {

-            if (m_CacheSize % CACHE_INCREMENT == 0)
-                m_Cache = (wxHtmlCacheItem*) realloc(m_Cache, (m_CacheSize + CACHE_INCREMENT) * sizeof(wxHtmlCacheItem));
-            tg = m_CacheSize++;
-            m_Cache[tg].Key = stpos = pos++;
-            dummy[0] = 0; i = 0;
-            while (pos < lng && 
-                   src[pos] != wxT('>') &&
-                   src[pos] != wxT(' ') && src[pos] != wxT('\r') && 
-                   src[pos] != wxT('\n') && src[pos] != wxT('\t')) 
+            tagBuffer[i] = (wxChar)wxToupper(*pos);
+        }
+        tagBuffer[i] = wxT('\0');
+
+        while (pos < end && *pos != wxT('>'))
+            ++pos;
+
+        if ( pos == end )
+        {
+            // We didn't find a closing bracket, this is not a valid tag after
+            // all. Notice that we need to roll back pos to avoid creating an
+            // invalid iterator when "++pos" is done in the loop statement.
+            --pos;
+
+            continue;
+        }
+
+        // We have a valid tag, add it to the cache.
+        size_t tg = Cache().size();
+        Cache().push_back(wxHtmlCacheItem());
+        Cache()[tg].Key = stpos;
+        Cache()[tg].Name = new wxChar[i+1];
+        memcpy(Cache()[tg].Name, tagBuffer, (i+1)*sizeof(wxChar));
+
+        if ((stpos+1) < end && *(stpos+1) == wxT('/')) // ending tag:
+        {
+            Cache()[tg].type = wxHtmlCacheItem::Type_EndingTag;
+            // find matching begin tag:
+            for (i = tg; i >= 0; i--)

             {
             {

-                dummy[i] = src[pos++];
-                if ((dummy[i] >= wxT('a')) && (dummy[i] <= wxT('z'))) dummy[i] -= (wxT('a') - wxT('A'));
-                i++;
+                if ((Cache()[i].type == wxHtmlCacheItem::Type_NoMatchingEndingTag) && (wxStrcmp(Cache()[i].Name, tagBuffer+1) == 0))
+                {
+                    Cache()[i].type = wxHtmlCacheItem::Type_Normal;
+                    Cache()[i].End1 = stpos;
+                    Cache()[i].End2 = pos + 1;
+                    break;
+                }

             }
             }

-            dummy[i] = 0;
-            m_Cache[tg].Name = new wxChar[i+1];
-            memcpy(m_Cache[tg].Name, dummy, (i+1)*sizeof(wxChar));
-
-            while (pos < lng && src[pos] != wxT('>')) pos++;
+        }
+        else
+        {
+            Cache()[tg].type = wxHtmlCacheItem::Type_NoMatchingEndingTag;

 
 

-            if (src[stpos+1] == wxT('/')) // ending tag:
+            if (wxIsCDATAElement(tagBuffer))

             {
             {

-                m_Cache[tg].End1 = m_Cache[tg].End2 = -2;
-                // find matching begin tag:
-                for (i = tg; i >= 0; i--)
-                    if ((m_Cache[i].End1 == -1) && (wxStrcmp(m_Cache[i].Name, dummy+1) == 0)) 
+                // store the orig pos in case we are missing the closing
+                // tag (see below)
+                const wxString::const_iterator old_pos = pos;
+                bool foundCloseTag = false;
+
+                // find next matching tag
+                int tag_len = wxStrlen(tagBuffer);
+                while (pos < end)
+                {
+                    // find the ending tag
+                    while (pos + 1 < end &&
+                           (*pos != '<' || *(pos+1) != '/'))
+                        ++pos;
+                    if (*pos == '<')
+                        ++pos;
+
+                    // see if it matches
+                    int match_pos = 0;
+                    while (pos < end && match_pos < tag_len )
+                    {
+                        wxChar c = *pos;
+                        if ( c == '>' || c == '<' )
+                            break;
+
+                        // cast to wxChar needed to suppress warning in
+                        // Unicode build
+                        if ((wxChar)wxToupper(c) == tagBuffer[match_pos])
+                        {
+                            ++match_pos;
+                        }
+                        else if (c == wxT(' ') || c == wxT('\n') ||
+                            c == wxT('\r') || c == wxT('\t'))
+                        {
+                            // need to skip over these
+                        }
+                        else
+                        {
+                            match_pos = 0;
+                        }
+                        ++pos;
+                    }
+
+                    // found a match
+                    if (match_pos == tag_len)

                     {
                     {

-                        m_Cache[i].End1 = stpos;
-                        m_Cache[i].End2 = pos + 1;
+                        pos = pos - tag_len - 3;
+                        foundCloseTag = true;

                         break;
                     }
                         break;
                     }

-            }
-            else 
-            {
-                m_Cache[tg].End1 = m_Cache[tg].End2 = -1;
+                    else // keep looking for the closing tag
+                    {
+                        ++pos;
+                    }
+                }
+                if (!foundCloseTag)
+                {
+                    // we didn't find closing tag; this means the markup
+                    // is incorrect and the best thing we can do is to
+                    // ignore the unclosed tag and continue parsing as if
+                    // it didn't exist:
+                    pos = old_pos;
+                }

             }
         }
             }
         }

-
-        pos++;

     }
 
     // ok, we're done, now we'll free .Name members of cache - we don't need it anymore:
     }
 
     // ok, we're done, now we'll free .Name members of cache - we don't need it anymore:

-    for (i = 0; i < m_CacheSize; i++) 
+    for ( wxHtmlTagsCacheData::iterator i = Cache().begin();
+          i != Cache().end(); ++i )

     {
     {

-        delete[] m_Cache[i].Name;
-        m_Cache[i].Name = NULL;
+        wxDELETEA(i->Name);

     }
 }
 
     }
 }
 

-void wxHtmlTagsCache::QueryTag(int at, int* end1, int* end2)
+wxHtmlTagsCache::~wxHtmlTagsCache()

 {
 {

-    if (m_Cache == NULL) return;
-    if (m_Cache[m_CachePos].Key != at) 
+    delete m_Cache;
+}
+
+void wxHtmlTagsCache::QueryTag(const wxString::const_iterator& at,
+                               const wxString::const_iterator& inputEnd,
+                               wxString::const_iterator *end1,
+                               wxString::const_iterator *end2,
+                               bool *hasEnding)
+{
+    if (Cache().empty())
+    {
+        *end1 =
+        *end2 = inputEnd;
+        *hasEnding = true;
+        return;
+    }
+
+    if (Cache()[m_CachePos].Key != at)

     {
     {

-        int delta = (at < m_Cache[m_CachePos].Key) ? -1 : 1;
-        do 
-        { 
-            m_CachePos += delta; 
+        int delta = (at < Cache()[m_CachePos].Key) ? -1 : 1;
+        do
+        {
+            m_CachePos += delta;
+
+            if ( m_CachePos < 0 || m_CachePos >= (int)Cache().size() )
+            {
+                if ( m_CachePos < 0 )
+                    m_CachePos = 0;
+                else
+                    m_CachePos = Cache().size() - 1;
+                // something is very wrong with HTML, give up by returning an
+                // impossibly large value which is going to be ignored by the
+                // caller
+                *end1 =
+                *end2 = inputEnd;
+                *hasEnding = true;
+                return;
+            }

         }
         }

-        while (m_Cache[m_CachePos].Key != at);
+        while (Cache()[m_CachePos].Key != at);
+    }
+
+    switch ( Cache()[m_CachePos].type )
+    {
+        case wxHtmlCacheItem::Type_Normal:
+            *end1 = Cache()[m_CachePos].End1;
+            *end2 = Cache()[m_CachePos].End2;
+            *hasEnding = true;
+            break;
+
+        case wxHtmlCacheItem::Type_EndingTag:
+            wxFAIL_MSG("QueryTag called for ending tag - can't be");
+            // but if it does happen, fall through, better than crashing
+
+        case wxHtmlCacheItem::Type_NoMatchingEndingTag:
+            // If input HTML is invalid and there's no closing tag for this
+            // one, pretend that it runs all the way to the end of input
+            *end1 = inputEnd;
+            *end2 = inputEnd;
+            *hasEnding = false;
+            break;

     }
     }

-    *end1 = m_Cache[m_CachePos].End1;
-    *end2 = m_Cache[m_CachePos].End2;

 }
 
 
 }
 
 


@@ -145,68 +296,86 @@ void wxHtmlTagsCache::QueryTag(int at, int* end1, int* end2)
 // wxHtmlTag
 //-----------------------------------------------------------------------------
 
 // wxHtmlTag
 //-----------------------------------------------------------------------------
 

-IMPLEMENT_CLASS(wxHtmlTag,wxObject)
-
-wxHtmlTag::wxHtmlTag(const wxString& source, int pos, int end_pos, 
+wxHtmlTag::wxHtmlTag(wxHtmlTag *parent,
+                     const wxString *source,
+                     const wxString::const_iterator& pos,
+                     const wxString::const_iterator& end_pos,

                      wxHtmlTagsCache *cache,
                      wxHtmlTagsCache *cache,

-                     wxHtmlEntitiesParser *entParser) : wxObject()
+                     wxHtmlEntitiesParser *entParser)

 {
 {

-    int i;
-    wxChar c;
+    /* Setup DOM relations */
+
+    m_Next = NULL;
+    m_FirstChild = m_LastChild = NULL;
+    m_Parent = parent;
+    if (parent)
+    {
+        m_Prev = m_Parent->m_LastChild;
+        if (m_Prev == NULL)
+            m_Parent->m_FirstChild = this;
+        else
+            m_Prev->m_Next = this;
+        m_Parent->m_LastChild = this;
+    }
+    else
+        m_Prev = NULL;
+
+    /* Find parameters and their values: */
+
+    wxChar c wxDUMMY_INITIALIZE(0);

 
     // fill-in name, params and begin pos:
 
     // fill-in name, params and begin pos:

-    i = pos+1;
-    if (source[i] == wxT('/')) 
-        { m_Ending = TRUE; i++; }
-    else 
-        m_Ending = FALSE;
+    wxString::const_iterator i(pos+1);

 
     // find tag's name and convert it to uppercase:
 
     // find tag's name and convert it to uppercase:

-    while ((i < end_pos) && 
-           ((c = source[i++]) != wxT(' ') && c != wxT('\r') && 
+    while ((i < end_pos) &&
+           ((c = *(i++)) != wxT(' ') && c != wxT('\r') &&

              c != wxT('\n') && c != wxT('\t') &&
              c != wxT('\n') && c != wxT('\t') &&

-             c != wxT('>'))) 
+             c != wxT('>') && c != wxT('/')))

     {
     {

-        if ((c >= wxT('a')) && (c <= wxT('z'))) 
+        if ((c >= wxT('a')) && (c <= wxT('z')))

             c -= (wxT('a') - wxT('A'));
         m_Name << c;
     }
 
     // if the tag has parameters, read them and "normalize" them,
             c -= (wxT('a') - wxT('A'));
         m_Name << c;
     }
 
     // if the tag has parameters, read them and "normalize" them,

-    // i.e. convert to uppercase, replace whitespaces by spaces and 
+    // i.e. convert to uppercase, replace whitespaces by spaces and

     // remove whitespaces around '=':
     // remove whitespaces around '=':

-    if (source[i-1] != wxT('>'))
+    if (*(i-1) != wxT('>'))

     {
         #define IS_WHITE(c) (c == wxT(' ') || c == wxT('\r') || \
                              c == wxT('\n') || c == wxT('\t'))
         wxString pname, pvalue;
         wxChar quote;
     {
         #define IS_WHITE(c) (c == wxT(' ') || c == wxT('\r') || \
                              c == wxT('\n') || c == wxT('\t'))
         wxString pname, pvalue;
         wxChar quote;

-        enum 
+        enum

         {
         {

-            ST_BEFORE_NAME = 1, 
+            ST_BEFORE_NAME = 1,

             ST_NAME,
             ST_BEFORE_EQ,
             ST_BEFORE_VALUE,
             ST_VALUE
         } state;
             ST_NAME,
             ST_BEFORE_EQ,
             ST_BEFORE_VALUE,
             ST_VALUE
         } state;

-    
+

         quote = 0;
         state = ST_BEFORE_NAME;
         while (i < end_pos)
         {
         quote = 0;
         state = ST_BEFORE_NAME;
         while (i < end_pos)
         {

-            c = source[i++];
+            c = *(i++);

 
 

-            if (c == wxT('>') && !(state == ST_VALUE && quote != 0)) 
+            if (c == wxT('>') && !(state == ST_VALUE && quote != 0))

             {
                 if (state == ST_BEFORE_EQ || state == ST_NAME)
                 {
                     m_ParamNames.Add(pname);
             {
                 if (state == ST_BEFORE_EQ || state == ST_NAME)
                 {
                     m_ParamNames.Add(pname);

-                    m_ParamValues.Add(wxEmptyString);
+                    m_ParamValues.Add(wxGetEmptyString());

                 }
                 else if (state == ST_VALUE && quote == 0)
                 {
                     m_ParamNames.Add(pname);
                 }
                 else if (state == ST_VALUE && quote == 0)
                 {
                     m_ParamNames.Add(pname);

-                    m_ParamValues.Add(entParser->Parse(pvalue));
+                    if (entParser)
+                        m_ParamValues.Add(entParser->Parse(pvalue));
+                    else
+                        m_ParamValues.Add(pvalue);

                 }
                 break;
             }
                 }
                 break;
             }


@@ -233,7 +402,7 @@ wxHtmlTag::wxHtmlTag(const wxString& source, int pos, int end_pos,
                     else if (!IS_WHITE(c))
                     {
                         m_ParamNames.Add(pname);
                     else if (!IS_WHITE(c))
                     {
                         m_ParamNames.Add(pname);

-                        m_ParamValues.Add(wxEmptyString);
+                        m_ParamValues.Add(wxGetEmptyString());

                         pname = c;
                         state = ST_NAME;
                     }
                         pname = c;
                         state = ST_NAME;
                     }


@@ -242,7 +411,7 @@ wxHtmlTag::wxHtmlTag(const wxString& source, int pos, int end_pos,
                     if (!IS_WHITE(c))
                     {
                         if (c == wxT('"') || c == wxT('\''))
                     if (!IS_WHITE(c))
                     {
                         if (c == wxT('"') || c == wxT('\''))

-                            quote = c, pvalue = wxEmptyString;
+                            quote = c, pvalue = wxGetEmptyString();

                         else
                             quote = 0, pvalue = c;
                         state = ST_VALUE;
                         else
                             quote = 0, pvalue = c;
                         state = ST_VALUE;


@@ -259,7 +428,10 @@ wxHtmlTag::wxHtmlTag(const wxString& source, int pos, int end_pos,
                             //     but wxHTML code relies on this... :(
                             pvalue.MakeUpper();
                         }
                             //     but wxHTML code relies on this... :(
                             pvalue.MakeUpper();
                         }

-                        m_ParamValues.Add(entParser->Parse(pvalue));
+                        if (entParser)
+                            m_ParamValues.Add(entParser->Parse(pvalue));
+                        else
+                            m_ParamValues.Add(pvalue);

                         state = ST_BEFORE_NAME;
                     }
                     else
                         state = ST_BEFORE_NAME;
                     }
                     else


@@ -267,27 +439,68 @@ wxHtmlTag::wxHtmlTag(const wxString& source, int pos, int end_pos,
                     break;
             }
         }
                     break;
             }
         }

-        
+

         #undef IS_WHITE
         #undef IS_WHITE

-   }
-   m_Begin = i;
+    }
+    m_Begin = i;
+    cache->QueryTag(pos, source->end(), &m_End1, &m_End2, &m_hasEnding);
+    if (m_End1 > end_pos) m_End1 = end_pos;
+    if (m_End2 > end_pos) m_End2 = end_pos;
+
+#if WXWIN_COMPATIBILITY_2_8
+    m_sourceStart = source->begin();
+#endif
+
+    // Try to parse any style parameters that can be handled simply by
+    // converting them to the equivalent HTML 3 attributes: this is a far cry
+    // from perfect but better than nothing.
+    static const struct EquivAttr
+    {
+        const char *style;
+        const char *attr;
+    } equivAttrs[] =
+    {
+        { "text-align",         "ALIGN"         },
+        { "width",              "WIDTH"         },
+        { "vertical-align",     "VALIGN"        },
+        { "background",         "BGCOLOR"       },
+    };
+
+    wxHtmlStyleParams styleParams(*this);
+    for ( unsigned n = 0; n < WXSIZEOF(equivAttrs); n++ )
+    {
+        const EquivAttr& ea = equivAttrs[n];
+        if ( styleParams.HasParam(ea.style) && !HasParam(ea.attr) )
+        {
+            m_ParamNames.Add(ea.attr);
+            m_ParamValues.Add(styleParams.GetParam(ea.style));
+        }
+    }
+}

 
 

-   cache->QueryTag(pos, &m_End1, &m_End2);
-   if (m_End1 > end_pos) m_End1 = end_pos;
-   if (m_End2 > end_pos) m_End2 = end_pos;
+wxHtmlTag::~wxHtmlTag()
+{
+    wxHtmlTag *t1, *t2;
+    t1 = m_FirstChild;
+    while (t1)
+    {
+        t2 = t1->GetNextSibling();
+        delete t1;
+        t1 = t2;
+    }

 }
 
 bool wxHtmlTag::HasParam(const wxString& par) const
 {
 }
 
 bool wxHtmlTag::HasParam(const wxString& par) const
 {

-    return (m_ParamNames.Index(par, FALSE) != wxNOT_FOUND);
+    return (m_ParamNames.Index(par, false) != wxNOT_FOUND);

 }
 
 }
 

-wxString wxHtmlTag::GetParam(const wxString& par, bool with_commas) const
+wxString wxHtmlTag::GetParam(const wxString& par, bool with_quotes) const

 {
 {

-    int index = m_ParamNames.Index(par, FALSE);
+    int index = m_ParamNames.Index(par, false);

     if (index == wxNOT_FOUND)
     if (index == wxNOT_FOUND)

-        return wxEmptyString;
-    if (with_commas)
+        return wxGetEmptyString();
+    if (with_quotes)

     {
         // VS: backward compatibility, seems to be never used by wxHTML...
         wxString s;
     {
         // VS: backward compatibility, seems to be never used by wxHTML...
         wxString s;


@@ -298,33 +511,33 @@ wxString wxHtmlTag::GetParam(const wxString& par, bool with_commas) const
         return m_ParamValues[index];
 }
 
         return m_ParamValues[index];
 }
 

-int wxHtmlTag::ScanParam(const wxString& par, wxChar *format, void *param) const
+int wxHtmlTag::ScanParam(const wxString& par,
+                         const char *format,
+                         void *param) const

 {
     wxString parval = GetParam(par);
     return wxSscanf(parval, format, param);
 }
 
 {
     wxString parval = GetParam(par);
     return wxSscanf(parval, format, param);
 }
 

-bool wxHtmlTag::GetParamAsColour(const wxString& par, wxColour *clr) const
+int wxHtmlTag::ScanParam(const wxString& par,
+                         const wchar_t *format,
+                         void *param) const

 {
 {

-    wxString str = GetParam(par);
-    
-    if (str.IsEmpty()) return FALSE;
-    if (str.GetChar(0) == wxT('#'))
-    {
-        unsigned long tmp;
-        if (ScanParam(par, wxT("#%lX"), &tmp) != 1)
-            return FALSE;
-        *clr = wxColour((unsigned char)((tmp & 0xFF0000) >> 16),
-                                           (unsigned char)((tmp & 0x00FF00) >> 8),
-                                           (unsigned char)(tmp & 0x0000FF));
-        return TRUE;
-    }
-    else
+    wxString parval = GetParam(par);
+    return wxSscanf(parval, format, param);
+}
+
+/* static */
+bool wxHtmlTag::ParseAsColour(const wxString& str, wxColour *clr)
+{
+    wxCHECK_MSG( clr, false, wxT("invalid colour argument") );
+
+    // handle colours defined in HTML 4.0 first:
+    if (str.length() > 1 && str[0] != wxT('#'))

     {
     {

-        // Handle colours defined in HTML 4.0:
-        #define HTML_COLOUR(name,r,g,b)                 \
-            if (str.IsSameAs(wxT(name), FALSE))         \
-                { *clr = wxColour(r,g,b); return TRUE; }
+        #define HTML_COLOUR(name, r, g, b)              \
+            if (str.IsSameAs(wxS(name), false))         \
+                { clr->Set(r, g, b); return true; }

         HTML_COLOUR("black",   0x00,0x00,0x00)
         HTML_COLOUR("silver",  0xC0,0xC0,0xC0)
         HTML_COLOUR("gray",    0x80,0x80,0x80)
         HTML_COLOUR("black",   0x00,0x00,0x00)
         HTML_COLOUR("silver",  0xC0,0xC0,0xC0)
         HTML_COLOUR("gray",    0x80,0x80,0x80)


@@ -342,22 +555,40 @@ bool wxHtmlTag::GetParamAsColour(const wxString& par, wxColour *clr) const
         HTML_COLOUR("teal",    0x00,0x80,0x80)
         HTML_COLOUR("aqua",    0x00,0xFF,0xFF)
         #undef HTML_COLOUR
         HTML_COLOUR("teal",    0x00,0x80,0x80)
         HTML_COLOUR("aqua",    0x00,0xFF,0xFF)
         #undef HTML_COLOUR

-        return FALSE;

     }
     }

+
+    // then try to parse #rrggbb representations or set from other well
+    // known names (note that this doesn't strictly conform to HTML spec,
+    // but it doesn't do real harm -- but it *must* be done after the standard
+    // colors are handled above):
+    if (clr->Set(str))
+        return true;
+
+    return false;
+}
+
+bool wxHtmlTag::GetParamAsColour(const wxString& par, wxColour *clr) const
+{
+    const wxString str = GetParam(par);
+    return !str.empty() && ParseAsColour(str, clr);

 }
 
 bool wxHtmlTag::GetParamAsInt(const wxString& par, int *clr) const
 {
 }
 
 bool wxHtmlTag::GetParamAsInt(const wxString& par, int *clr) const
 {

-    if (!HasParam(par)) return FALSE;
+    if ( !HasParam(par) )
+        return false;
+

     long i;
     long i;

-    bool succ = GetParam(par).ToLong(&i);
+    if ( !GetParam(par).ToLong(&i) )
+        return false;
+

     *clr = (int)i;
     *clr = (int)i;

-    return succ;
+    return true;

 }
 
 wxString wxHtmlTag::GetAllParams() const
 {
 }
 
 wxString wxHtmlTag::GetAllParams() const
 {

-    // VS: this function is for backward compatiblity only, 
+    // VS: this function is for backward compatibility only,

     //     never used by wxHTML
     wxString s;
     size_t cnt = m_ParamNames.GetCount();
     //     never used by wxHTML
     wxString s;
     size_t cnt = m_ParamNames.GetCount();


@@ -373,4 +604,41 @@ wxString wxHtmlTag::GetAllParams() const
     return s;
 }
 
     return s;
 }
 

+wxHtmlTag *wxHtmlTag::GetFirstSibling() const
+{
+    if (m_Parent)
+        return m_Parent->m_FirstChild;
+    else
+    {
+        wxHtmlTag *cur = (wxHtmlTag*)this;
+        while (cur->m_Prev)
+            cur = cur->m_Prev;
+        return cur;
+    }
+}
+
+wxHtmlTag *wxHtmlTag::GetLastSibling() const
+{
+    if (m_Parent)
+        return m_Parent->m_LastChild;
+    else
+    {
+        wxHtmlTag *cur = (wxHtmlTag*)this;
+        while (cur->m_Next)
+            cur = cur->m_Next;
+        return cur;
+    }
+}
+
+wxHtmlTag *wxHtmlTag::GetNextTag() const
+{
+    if (m_FirstChild) return m_FirstChild;
+    if (m_Next) return m_Next;
+    wxHtmlTag *cur = m_Parent;
+    if (!cur) return NULL;
+    while (cur->m_Parent && !cur->m_Next)
+        cur = cur->m_Parent;
+    return cur->m_Next;
+}
+

 #endif
 #endif