X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/43a302f200f1e9f5f21380bbc7ba74ad8c22d6d6..7d6a4d96961eac84d05db8bb24c64d39003f6e54:/src/xml/xml.cpp?ds=inline

diff --git a/src/xml/xml.cpp b/src/xml/xml.cpp
index 4941e6104b..ee78a9aca4 100644
--- a/src/xml/xml.cpp
+++ b/src/xml/xml.cpp
@@ -29,6 +29,8 @@
 #include "wx/datstrm.h"
 #include "wx/zstream.h"
 #include "wx/strconv.h"
+#include "wx/scopedptr.h"
+#include "wx/versioninfo.h"
 
 #include "expat.h" // from Expat
 
@@ -53,8 +55,11 @@ wxXmlNode::wxXmlNode(wxXmlNode *parent,wxXmlNodeType type,
     : m_type(type), m_name(name), m_content(content),
       m_attrs(attrs), m_parent(parent),
       m_children(NULL), m_next(next),
-      m_lineNo(lineNo)
+      m_lineNo(lineNo),
+      m_noConversion(false)
 {
+    wxASSERT_MSG ( type != wxXML_ELEMENT_NODE || content.empty(), "element nodes can't have content" );
+
     if (m_parent)
     {
         if (m_parent->m_children)
@@ -73,8 +78,10 @@ wxXmlNode::wxXmlNode(wxXmlNodeType type, const wxString& name,
     : m_type(type), m_name(name), m_content(content),
       m_attrs(NULL), m_parent(NULL),
       m_children(NULL), m_next(NULL),
-      m_lineNo(lineNo)
-{}
+      m_lineNo(lineNo), m_noConversion(false)
+{
+    wxASSERT_MSG ( type != wxXML_ELEMENT_NODE || content.empty(), "element nodes can't have content" );
+}
 
 wxXmlNode::wxXmlNode(const wxXmlNode& node)
 {
@@ -114,6 +121,7 @@ void wxXmlNode::DoCopy(const wxXmlNode& node)
     m_name = node.m_name;
     m_content = node.m_content;
     m_lineNo = node.m_lineNo;
+    m_noConversion = node.m_noConversion;
     m_children = NULL;
 
     wxXmlNode *n = node.m_children;
@@ -392,28 +400,28 @@ bool wxXmlNode::IsWhitespaceOnly() const
 //-----------------------------------------------------------------------------
 
 wxXmlDocument::wxXmlDocument()
-    : m_version(wxT("1.0")), m_fileEncoding(wxT("utf-8")), m_root(NULL)
+    : m_version(wxS("1.0")), m_fileEncoding(wxS("UTF-8")), m_docNode(NULL)
 {
 #if !wxUSE_UNICODE
-    m_encoding = wxT("UTF-8");
+    m_encoding = wxS("UTF-8");
 #endif
 }
 
 wxXmlDocument::wxXmlDocument(const wxString& filename, const wxString& encoding)
-              :wxObject(), m_root(NULL)
+              :wxObject(), m_docNode(NULL)
 {
     if ( !Load(filename, encoding) )
     {
-        wxDELETE(m_root);
+        wxDELETE(m_docNode);
     }
 }
 
 wxXmlDocument::wxXmlDocument(wxInputStream& stream, const wxString& encoding)
-              :wxObject(), m_root(NULL)
+              :wxObject(), m_docNode(NULL)
 {
     if ( !Load(stream, encoding) )
     {
-        wxDELETE(m_root);
+        wxDELETE(m_docNode);
     }
 }
 
@@ -425,7 +433,7 @@ wxXmlDocument::wxXmlDocument(const wxXmlDocument& doc)
 
 wxXmlDocument& wxXmlDocument::operator=(const wxXmlDocument& doc)
 {
-    wxDELETE(m_root);
+    wxDELETE(m_docNode);
     DoCopy(doc);
     return *this;
 }
@@ -438,16 +446,16 @@ void wxXmlDocument::DoCopy(const wxXmlDocument& doc)
 #endif
     m_fileEncoding = doc.m_fileEncoding;
 
-    if (doc.m_root)
-        m_root = new wxXmlNode(*doc.m_root);
+    if (doc.m_docNode)
+        m_docNode = new wxXmlNode(*doc.m_docNode);
     else
-        m_root = NULL;
+        m_docNode = NULL;
 }
 
 bool wxXmlDocument::Load(const wxString& filename, const wxString& encoding, int flags)
 {
     wxFileInputStream stream(filename);
-    if (!stream.Ok())
+    if (!stream.IsOk())
         return false;
     return Load(stream, encoding, flags);
 }
@@ -455,12 +463,96 @@ bool wxXmlDocument::Load(const wxString& filename, const wxString& encoding, int
 bool wxXmlDocument::Save(const wxString& filename, int indentstep) const
 {
     wxFileOutputStream stream(filename);
-    if (!stream.Ok())
+    if (!stream.IsOk())
         return false;
     return Save(stream, indentstep);
 }
 
+wxXmlNode *wxXmlDocument::GetRoot() const
+{
+    wxXmlNode *node = m_docNode;
+    if (node)
+    {
+        node = m_docNode->GetChildren();
+        while (node != NULL && node->GetType() != wxXML_ELEMENT_NODE)
+            node = node->GetNext();
+    }
+    return node;
+}
 
+wxXmlNode *wxXmlDocument::DetachRoot()
+{
+    wxXmlNode *node = m_docNode;
+    if (node)
+    {
+        node = m_docNode->GetChildren();
+        wxXmlNode *prev = NULL;
+        while (node != NULL && node->GetType() != wxXML_ELEMENT_NODE)
+        {
+            prev = node;
+            node = node->GetNext();
+        }
+        if (node)
+        {
+            if (node == m_docNode->GetChildren())
+                m_docNode->SetChildren(node->GetNext());
+
+            if (prev)
+                prev->SetNext(node->GetNext());
+
+            node->SetParent(NULL);
+            node->SetNext(NULL);
+        }
+    }
+    return node;
+}
+
+void wxXmlDocument::SetRoot(wxXmlNode *root)
+{
+    if (root)
+    {
+        wxASSERT_MSG( root->GetType() == wxXML_ELEMENT_NODE,
+                      "Can only set an element type node as root" );
+    }
+
+    wxXmlNode *node = m_docNode;
+    if (node)
+    {
+        node = m_docNode->GetChildren();
+        wxXmlNode *prev = NULL;
+        while (node != NULL && node->GetType() != wxXML_ELEMENT_NODE)
+        {
+            prev = node;
+            node = node->GetNext();
+        }
+        if (node && root)
+        {
+            root->SetNext( node->GetNext() );
+            wxDELETE(node);
+        }
+        if (prev)
+            prev->SetNext(root);
+        else
+            m_docNode->SetChildren(root);
+    }
+    else
+    {
+        m_docNode = new wxXmlNode(wxXML_DOCUMENT_NODE, wxEmptyString);
+        m_docNode->SetChildren(root);
+    }
+    if (root)
+        root->SetParent(m_docNode);
+}
+
+void wxXmlDocument::AppendToProlog(wxXmlNode *node)
+{
+    if (!m_docNode)
+        m_docNode = new wxXmlNode(wxXML_DOCUMENT_NODE, wxEmptyString);
+    if (IsOk())
+        m_docNode->InsertChild( node, GetRoot() );
+    else
+        m_docNode->AddChild( node );
+}
 
 //-----------------------------------------------------------------------------
 //  wxXmlDocument loading routines
@@ -485,7 +577,7 @@ static wxString CharToString(wxMBConv *conv,
 #endif // !wxUSE_UNICODE
 
     wxUnusedVar(conv);
-    return wxString::FromUTF8(s, len);
+    return wxString::FromUTF8Unchecked(s, len);
 }
 
 // returns true if the given string contains only whitespaces
@@ -494,7 +586,7 @@ bool wxIsWhiteOnly(const wxString& buf)
     for ( wxString::const_iterator i = buf.begin(); i != buf.end(); ++i )
     {
         wxChar c = *i;
-        if ( c != wxT(' ') && c != wxT('\t') && c != wxT('\n') && c != wxT('\r'))
+        if ( c != wxS(' ') && c != wxS('\t') && c != wxS('\n') && c != wxS('\r'))
             return false;
     }
     return true;
@@ -505,7 +597,6 @@ struct wxXmlParsingContext
 {
     wxXmlParsingContext()
         : conv(NULL),
-          root(NULL),
           node(NULL),
           lastChild(NULL),
           lastAsText(NULL),
@@ -514,7 +605,6 @@ struct wxXmlParsingContext
 
     XML_Parser parser;
     wxMBConv  *conv;
-    wxXmlNode *root;
     wxXmlNode *node;                    // the node being parsed
     wxXmlNode *lastChild;               // the last child of "node"
     wxXmlNode *lastAsText;              // the last _text_ child of "node"
@@ -547,16 +637,8 @@ static void StartElementHnd(void *userData, const char *name, const char **atts)
         a += 2;
     }
 
-    if (ctx->root == NULL)
-    {
-        ctx->root = node;
-    }
-    else
-    {
-        ASSERT_LAST_CHILD_OK(ctx);
-        ctx->node->InsertChildAfter(node, ctx->lastChild);
-    }
-
+    ASSERT_LAST_CHILD_OK(ctx);
+    ctx->node->InsertChildAfter(node, ctx->lastChild);
     ctx->lastAsText = NULL;
     ctx->lastChild = NULL; // our new node "node" has no children yet
 
@@ -594,7 +676,7 @@ static void TextHnd(void *userData, const char *s, int len)
         if (!whiteOnly)
         {
             wxXmlNode *textnode =
-                new wxXmlNode(wxXML_TEXT_NODE, wxT("text"), str,
+                new wxXmlNode(wxXML_TEXT_NODE, wxS("text"), str,
                               XML_GetCurrentLineNumber(ctx->parser));
 
             ASSERT_LAST_CHILD_OK(ctx);
@@ -609,7 +691,7 @@ static void StartCdataHnd(void *userData)
     wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
 
     wxXmlNode *textnode =
-        new wxXmlNode(wxXML_CDATA_SECTION_NODE, wxT("cdata"), wxT(""),
+        new wxXmlNode(wxXML_CDATA_SECTION_NODE, wxS("cdata"), wxS(""),
                       XML_GetCurrentLineNumber(ctx->parser));
 
     ASSERT_LAST_CHILD_OK(ctx);
@@ -617,25 +699,44 @@ static void StartCdataHnd(void *userData)
     ctx->lastChild= ctx->lastAsText = textnode;
 }
 
+static void EndCdataHnd(void *userData)
+{
+    wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
+
+    // we need to reset this pointer so that subsequent text nodes don't append
+    // their contents to this one but create new wxXML_TEXT_NODE objects (or
+    // not create anything at all if only white space follows the CDATA section
+    // and wxXMLDOC_KEEP_WHITESPACE_NODES is not used as is commonly the case)
+    ctx->lastAsText = NULL;
+}
+
 static void CommentHnd(void *userData, const char *data)
 {
     wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
 
-    if (ctx->node)
-    {
-        wxXmlNode *commentnode =
-            new wxXmlNode(wxXML_COMMENT_NODE,
-                          wxT("comment"), CharToString(ctx->conv, data),
-                          XML_GetCurrentLineNumber(ctx->parser));
+    wxXmlNode *commentnode =
+        new wxXmlNode(wxXML_COMMENT_NODE,
+                      wxS("comment"), CharToString(ctx->conv, data),
+                      XML_GetCurrentLineNumber(ctx->parser));
 
-        ASSERT_LAST_CHILD_OK(ctx);
-        ctx->node->InsertChildAfter(commentnode, ctx->lastChild);
-        ctx->lastChild = commentnode;
-    }
-    //else: ctx->node == NULL happens if there is a comment before
-    //      the root element. We current don't have a way to represent
-    //      these in wxXmlDocument (FIXME).
+    ASSERT_LAST_CHILD_OK(ctx);
+    ctx->node->InsertChildAfter(commentnode, ctx->lastChild);
+    ctx->lastChild = commentnode;
+    ctx->lastAsText = NULL;
+}
 
+static void PIHnd(void *userData, const char *target, const char *data)
+{
+    wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
+
+    wxXmlNode *pinode =
+        new wxXmlNode(wxXML_PI_NODE, CharToString(ctx->conv, target),
+                      CharToString(ctx->conv, data),
+                      XML_GetCurrentLineNumber(ctx->parser));
+
+    ASSERT_LAST_CHILD_OK(ctx);
+    ctx->node->InsertChildAfter(pinode, ctx->lastChild);
+    ctx->lastChild = pinode;
     ctx->lastAsText = NULL;
 }
 
@@ -648,10 +749,10 @@ static void DefaultHnd(void *userData, const char *s, int len)
 
         wxString buf = CharToString(ctx->conv, s, (size_t)len);
         int pos;
-        pos = buf.Find(wxT("encoding="));
+        pos = buf.Find(wxS("encoding="));
         if (pos != wxNOT_FOUND)
             ctx->encoding = buf.Mid(pos + 10).BeforeFirst(buf[(size_t)pos+9]);
-        pos = buf.Find(wxT("version="));
+        pos = buf.Find(wxS("version="));
         if (pos != wxNOT_FOUND)
             ctx->version = buf.Mid(pos + 9).BeforeFirst(buf[(size_t)pos+8]);
     }
@@ -703,21 +804,24 @@ bool wxXmlDocument::Load(wxInputStream& stream, const wxString& encoding, int fl
     wxXmlParsingContext ctx;
     bool done;
     XML_Parser parser = XML_ParserCreate(NULL);
+    wxXmlNode *root = new wxXmlNode(wxXML_DOCUMENT_NODE, wxEmptyString);
 
-    ctx.encoding = wxT("UTF-8"); // default in absence of encoding=""
+    ctx.encoding = wxS("UTF-8"); // default in absence of encoding=""
     ctx.conv = NULL;
 #if !wxUSE_UNICODE
-    if ( encoding.CmpNoCase(wxT("UTF-8")) != 0 )
+    if ( encoding.CmpNoCase(wxS("UTF-8")) != 0 )
         ctx.conv = new wxCSConv(encoding);
 #endif
     ctx.removeWhiteOnlyNodes = (flags & wxXMLDOC_KEEP_WHITESPACE_NODES) == 0;
     ctx.parser = parser;
+    ctx.node = root;
 
     XML_SetUserData(parser, (void*)&ctx);
     XML_SetElementHandler(parser, StartElementHnd, EndElementHnd);
     XML_SetCharacterDataHandler(parser, TextHnd);
-    XML_SetStartCdataSectionHandler(parser, StartCdataHnd);
+    XML_SetCdataSectionHandler(parser, StartCdataHnd, EndCdataHnd);;
     XML_SetCommentHandler(parser, CommentHnd);
+    XML_SetProcessingInstructionHandler(parser, PIHnd);
     XML_SetDefaultHandler(parser, DefaultHnd);
     XML_SetUnknownEncodingHandler(parser, UnknownEncodingHnd, NULL);
 
@@ -732,7 +836,7 @@ bool wxXmlDocument::Load(wxInputStream& stream, const wxString& encoding, int fl
                            *wxConvCurrent);
             wxLogError(_("XML parsing error: '%s' at line %d"),
                        error.c_str(),
-                       XML_GetCurrentLineNumber(parser));
+                       (int)XML_GetCurrentLineNumber(parser));
             ok = false;
             break;
         }
@@ -744,11 +848,11 @@ bool wxXmlDocument::Load(wxInputStream& stream, const wxString& encoding, int fl
             SetVersion(ctx.version);
         if (!ctx.encoding.empty())
             SetFileEncoding(ctx.encoding);
-        SetRoot(ctx.root);
+        SetDocumentNode(root);
     }
     else
     {
-        delete ctx.root;
+        delete root;
     }
 
     XML_ParserFree(parser);
@@ -767,193 +871,281 @@ bool wxXmlDocument::Load(wxInputStream& stream, const wxString& encoding, int fl
 //  wxXmlDocument saving routines
 //-----------------------------------------------------------------------------
 
+// helpers for XML generation
+namespace
+{
+
 // write string to output:
-inline static void OutputString(wxOutputStream& stream, const wxString& str,
-                                wxMBConv *convMem = NULL,
-                                wxMBConv *convFile = NULL)
+bool OutputString(wxOutputStream& stream,
+                  const wxString& str,
+                  wxMBConv *convMem,
+                  wxMBConv *convFile)
 {
     if (str.empty())
-        return;
+        return true;
 
 #if wxUSE_UNICODE
     wxUnusedVar(convMem);
+    if ( !convFile )
+        convFile = &wxConvUTF8;
 
-    const wxWX2MBbuf buf(str.mb_str(*(convFile ? convFile : &wxConvUTF8)));
-    stream.Write((const char*)buf, strlen((const char*)buf));
+    const wxScopedCharBuffer buf(str.mb_str(*convFile));
+    if ( !buf.length() )
+    {
+        // conversion failed, can't write this string in an XML file in this
+        // (presumably non-UTF-8) encoding
+        return false;
+    }
+
+    stream.Write(buf, buf.length());
 #else // !wxUSE_UNICODE
     if ( convFile && convMem )
     {
         wxString str2(str.wc_str(*convMem), *convFile);
-        stream.Write(str2.mb_str(), str2.Len());
+        stream.Write(str2.mb_str(), str2.length());
     }
     else // no conversions to do
     {
-        stream.Write(str.mb_str(), str.Len());
+        stream.Write(str.mb_str(), str.length());
     }
 #endif // wxUSE_UNICODE/!wxUSE_UNICODE
+
+    return stream.IsOk();
 }
 
-// flags for OutputStringEnt()
-enum
+enum EscapingMode
 {
-    XML_ESCAPE_QUOTES = 1
+    Escape_Text,
+    Escape_Attribute
 };
 
 // Same as above, but create entities first.
-// Translates '<' to "&lt;", '>' to "&gt;" and '&' to "&amp;"
-static void OutputStringEnt(wxOutputStream& stream, const wxString& str,
-                            wxMBConv *convMem = NULL,
-                            wxMBConv *convFile = NULL,
-                            int flags = 0)
-{
-    wxString buf;
-    size_t i, last, len;
-    wxChar c;
-
-    len = str.Len();
-    last = 0;
-    for (i = 0; i < len; i++)
-    {
-        c = str.GetChar(i);
-        if (c == wxT('<') || c == wxT('>') ||
-            (c == wxT('&') && str.Mid(i+1, 4) != wxT("amp;")) ||
-            ((flags & XML_ESCAPE_QUOTES) && c == wxT('"')))
+// Translates '<' to "&lt;", '>' to "&gt;" and so on, according to the spec:
+// http://www.w3.org/TR/2000/WD-xml-c14n-20000119.html#charescaping
+bool OutputEscapedString(wxOutputStream& stream,
+                         const wxString& str,
+                         wxMBConv *convMem,
+                         wxMBConv *convFile,
+                         EscapingMode mode)
+{
+    wxString escaped;
+    escaped.reserve(str.length());
+
+    for ( wxString::const_iterator i = str.begin(); i != str.end(); ++i )
+    {
+        const wxChar c = *i;
+
+        switch ( c )
         {
-            OutputString(stream, str.Mid(last, i - last), convMem, convFile);
-            switch (c)
-            {
-                case wxT('<'):
-                    OutputString(stream, wxT("&lt;"));
-                    break;
-                case wxT('>'):
-                    OutputString(stream, wxT("&gt;"));
-                    break;
-                case wxT('&'):
-                    OutputString(stream, wxT("&amp;"));
-                    break;
-                case wxT('"'):
-                    OutputString(stream, wxT("&quot;"));
-                    break;
-                default:
-                    break;
-            }
-            last = i + 1;
+            case wxS('<'):
+                escaped.append(wxS("&lt;"));
+                break;
+            case wxS('>'):
+                escaped.append(wxS("&gt;"));
+                break;
+            case wxS('&'):
+                escaped.append(wxS("&amp;"));
+                break;
+            case wxS('\r'):
+                escaped.append(wxS("&#xD;"));
+                break;
+            default:
+                if ( mode == Escape_Attribute )
+                {
+                    switch ( c )
+                    {
+                        case wxS('"'):
+                            escaped.append(wxS("&quot;"));
+                            break;
+                        case wxS('\t'):
+                            escaped.append(wxS("&#x9;"));
+                            break;
+                        case wxS('\n'):
+                            escaped.append(wxS("&#xA;"));
+                            break;
+                        default:
+                            escaped.append(c);
+                    }
+
+                }
+                else
+                {
+                    escaped.append(c);
+                }
         }
     }
-    OutputString(stream, str.Mid(last, i - last), convMem, convFile);
+
+    return OutputString(stream, escaped, convMem, convFile);
 }
 
-inline static void OutputIndentation(wxOutputStream& stream, int indent)
+bool OutputIndentation(wxOutputStream& stream,
+                       int indent,
+                       wxMBConv *convMem,
+                       wxMBConv *convFile)
 {
-    wxString str = wxT("\n");
-    for (int i = 0; i < indent; i++)
-        str << wxT(' ') << wxT(' ');
-    OutputString(stream, str);
+    wxString str(wxS("\n"));
+    str += wxString(indent, wxS(' '));
+    return OutputString(stream, str, convMem, convFile);
 }
 
-static void OutputNode(wxOutputStream& stream, wxXmlNode *node, int indent,
-                       wxMBConv *convMem, wxMBConv *convFile, int indentstep)
+bool OutputNode(wxOutputStream& stream,
+                wxXmlNode *node,
+                int indent,
+                wxMBConv *convMem,
+                wxMBConv *convFile,
+                int indentstep)
 {
-    wxXmlNode *n, *prev;
-    wxXmlAttribute *attr;
-
+    bool rc;
     switch (node->GetType())
     {
         case wxXML_CDATA_SECTION_NODE:
-            OutputString( stream, wxT("<![CDATA["));
-            OutputString( stream, node->GetContent() );
-            OutputString( stream, wxT("]]>") );
+            rc = OutputString(stream, wxS("<![CDATA["), convMem, convFile) &&
+                 OutputString(stream, node->GetContent(), convMem, convFile) &&
+                 OutputString(stream, wxS("]]>"), convMem, convFile);
             break;
 
         case wxXML_TEXT_NODE:
-            OutputStringEnt(stream, node->GetContent(), convMem, convFile);
+            if (node->GetNoConversion())
+            {
+                stream.Write(node->GetContent().c_str(), node->GetContent().Length());
+                rc = true;
+            }
+            else
+                rc = OutputEscapedString(stream, node->GetContent(),
+                                     convMem, convFile,
+                                     Escape_Text);
             break;
 
         case wxXML_ELEMENT_NODE:
-            OutputString(stream, wxT("<"));
-            OutputString(stream, node->GetName());
+            rc = OutputString(stream, wxS("<"), convMem, convFile) &&
+                 OutputString(stream, node->GetName(), convMem, convFile);
 
-            attr = node->GetAttributes();
-            while (attr)
+            if ( rc )
             {
-                OutputString(stream, wxT(" ") + attr->GetName() +  wxT("=\""));
-                OutputStringEnt(stream, attr->GetValue(), convMem, convFile,
-                                XML_ESCAPE_QUOTES);
-                OutputString(stream, wxT("\""));
-                attr = attr->GetNext();
+                for ( wxXmlAttribute *attr = node->GetAttributes();
+                      attr && rc;
+                      attr = attr->GetNext() )
+                {
+                    rc = OutputString(stream,
+                                      wxS(" ") + attr->GetName() +  wxS("=\""),
+                                      convMem, convFile) &&
+                         OutputEscapedString(stream, attr->GetValue(),
+                                             convMem, convFile,
+                                             Escape_Attribute) &&
+                         OutputString(stream, wxS("\""), convMem, convFile);
+                }
             }
 
-            if (node->GetChildren())
+            if ( node->GetChildren() )
             {
-                OutputString(stream, wxT(">"));
-                prev = NULL;
-                n = node->GetChildren();
-                while (n)
+                rc = OutputString(stream, wxS(">"), convMem, convFile);
+
+                wxXmlNode *prev = NULL;
+                for ( wxXmlNode *n = node->GetChildren();
+                      n && rc;
+                      n = n->GetNext() )
                 {
-                    if (indentstep >= 0 && n && n->GetType() != wxXML_TEXT_NODE)
-                        OutputIndentation(stream, indent + indentstep);
-                    OutputNode(stream, n, indent + indentstep, convMem, convFile, indentstep);
+                    if ( indentstep >= 0 && n->GetType() != wxXML_TEXT_NODE )
+                    {
+                        rc = OutputIndentation(stream, indent + indentstep,
+                                               convMem, convFile);
+                    }
+
+                    if ( rc )
+                        rc = OutputNode(stream, n, indent + indentstep,
+                                        convMem, convFile, indentstep);
+
                     prev = n;
-                    n = n->GetNext();
                 }
-                if (indentstep >= 0 && prev && prev->GetType() != wxXML_TEXT_NODE)
-                    OutputIndentation(stream, indent);
-                OutputString(stream, wxT("</"));
-                OutputString(stream, node->GetName());
-                OutputString(stream, wxT(">"));
+
+                if ( rc && indentstep >= 0 &&
+                        prev && prev->GetType() != wxXML_TEXT_NODE )
+                {
+                    rc = OutputIndentation(stream, indent, convMem, convFile);
+                }
+
+                if ( rc )
+                {
+                    rc = OutputString(stream, wxS("</"), convMem, convFile) &&
+                         OutputString(stream, node->GetName(),
+                                      convMem, convFile) &&
+                         OutputString(stream, wxS(">"), convMem, convFile);
+                }
+            }
+            else // no children, output "<foo/>"
+            {
+                rc = OutputString(stream, wxS("/>"), convMem, convFile);
             }
-            else
-                OutputString(stream, wxT("/>"));
             break;
 
         case wxXML_COMMENT_NODE:
-            OutputString(stream, wxT("<!--"));
-            OutputString(stream, node->GetContent(), convMem, convFile);
-            OutputString(stream, wxT("-->"));
+            rc = OutputString(stream, wxS("<!--"), convMem, convFile) &&
+                 OutputString(stream, node->GetContent(), convMem, convFile) &&
+                 OutputString(stream, wxS("-->"), convMem, convFile);
+            break;
+
+        case wxXML_PI_NODE:
+            rc = OutputString(stream, wxT("<?"), convMem, convFile) &&
+                 OutputString(stream, node->GetName(), convMem, convFile) &&
+                 OutputString(stream, wxT(" "), convMem, convFile) &&
+                 OutputString(stream, node->GetContent(), convMem, convFile) &&
+                 OutputString(stream, wxT("?>"), convMem, convFile);
             break;
 
         default:
-            wxFAIL_MSG(wxT("unsupported node type"));
+            wxFAIL_MSG("unsupported node type");
+            rc = false;
     }
+
+    return rc;
 }
 
+} // anonymous namespace
+
 bool wxXmlDocument::Save(wxOutputStream& stream, int indentstep) const
 {
     if ( !IsOk() )
         return false;
 
-    wxString s;
-
-    wxMBConv *convMem = NULL,
-             *convFile;
+    wxScopedPtr<wxMBConv> convMem, convFile;
 
 #if wxUSE_UNICODE
-    convFile = new wxCSConv(GetFileEncoding());
-    convMem = NULL;
+    convFile.reset(new wxCSConv(GetFileEncoding()));
 #else
     if ( GetFileEncoding().CmpNoCase(GetEncoding()) != 0 )
     {
-        convFile = new wxCSConv(GetFileEncoding());
-        convMem = new wxCSConv(GetEncoding());
-    }
-    else // file and in-memory encodings are the same, no conversion needed
-    {
-        convFile =
-        convMem = NULL;
+        convFile.reset(new wxCSConv(GetFileEncoding()));
+        convMem.reset(new wxCSConv(GetEncoding()));
     }
+    //else: file and in-memory encodings are the same, no conversion needed
 #endif
 
-    s.Printf(wxT("<?xml version=\"%s\" encoding=\"%s\"?>\n"),
-             GetVersion().c_str(), GetFileEncoding().c_str());
-    OutputString(stream, s);
+    wxString dec = wxString::Format(
+                                    wxS("<?xml version=\"%s\" encoding=\"%s\"?>\n"),
+                                    GetVersion(), GetFileEncoding()
+                                   );
+    bool rc = OutputString(stream, dec, convMem.get(), convFile.get());
 
-    OutputNode(stream, GetRoot(), 0, convMem, convFile, indentstep);
-    OutputString(stream, wxT("\n"));
+    wxXmlNode *node = GetDocumentNode();
+    if ( node )
+        node = node->GetChildren();
 
-    delete convFile;
-    delete convMem;
+    while( rc && node )
+    {
+        rc = OutputNode(stream, node, 0, convMem.get(),
+                        convFile.get(), indentstep) &&
+             OutputString(stream, wxS("\n"), convMem.get(), convFile.get());
+        node = node->GetNext();
+    }
+    return rc;
+}
 
-    return true;
+/*static*/ wxVersionInfo wxXmlDocument::GetLibraryVersionInfo()
+{
+    return wxVersionInfo("expat",
+                         XML_MAJOR_VERSION,
+                         XML_MINOR_VERSION,
+                         XML_MICRO_VERSION);
 }
 
 #endif // wxUSE_XML