X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/97757cee26f3204b0f7a44bb9f09755e94a937a6..079f4130b861d094c79e0952966caad8b85dab67:/src/xml/xml.cpp

diff --git a/src/xml/xml.cpp b/src/xml/xml.cpp
index 990d6aa81f..1555d29b72 100644
--- a/src/xml/xml.cpp
+++ b/src/xml/xml.cpp
@@ -29,6 +29,7 @@
 #include "wx/datstrm.h"
 #include "wx/zstream.h"
 #include "wx/strconv.h"
+#include "wx/ptr_scpd.h"
 
 #include "expat.h" // from Expat
 
@@ -39,6 +40,9 @@ WX_CHECK_BUILD_OPTIONS("wxXML")
 IMPLEMENT_CLASS(wxXmlDocument, wxObject)
 
 
+// a private utility used by wxXML
+static bool wxIsWhiteOnly(const wxString& buf);
+
 
 //-----------------------------------------------------------------------------
 //  wxXmlNode
@@ -46,10 +50,11 @@ IMPLEMENT_CLASS(wxXmlDocument, wxObject)
 
 wxXmlNode::wxXmlNode(wxXmlNode *parent,wxXmlNodeType type,
                      const wxString& name, const wxString& content,
-                     wxXmlProperty *props, wxXmlNode *next)
+                     wxXmlAttribute *attrs, wxXmlNode *next, int lineNo)
     : m_type(type), m_name(name), m_content(content),
-      m_properties(props), m_parent(parent),
-      m_children(NULL), m_next(next)
+      m_attrs(attrs), m_parent(parent),
+      m_children(NULL), m_next(next),
+      m_lineNo(lineNo)
 {
     if (m_parent)
     {
@@ -64,10 +69,12 @@ wxXmlNode::wxXmlNode(wxXmlNode *parent,wxXmlNodeType type,
 }
 
 wxXmlNode::wxXmlNode(wxXmlNodeType type, const wxString& name,
-                     const wxString& content)
+                     const wxString& content,
+                     int lineNo)
     : m_type(type), m_name(name), m_content(content),
-      m_properties(NULL), m_parent(NULL),
-      m_children(NULL), m_next(NULL)
+      m_attrs(NULL), m_parent(NULL),
+      m_children(NULL), m_next(NULL),
+      m_lineNo(lineNo)
 {}
 
 wxXmlNode::wxXmlNode(const wxXmlNode& node)
@@ -86,8 +93,8 @@ wxXmlNode::~wxXmlNode()
         delete c;
     }
 
-    wxXmlProperty *p, *p2;
-    for (p = m_properties; p; p = p2)
+    wxXmlAttribute *p, *p2;
+    for (p = m_attrs; p; p = p2)
     {
         p2 = p->GetNext();
         delete p;
@@ -96,7 +103,7 @@ wxXmlNode::~wxXmlNode()
 
 wxXmlNode& wxXmlNode::operator=(const wxXmlNode& node)
 {
-    wxDELETE(m_properties);
+    wxDELETE(m_attrs);
     wxDELETE(m_children);
     DoCopy(node);
     return *this;
@@ -107,6 +114,7 @@ void wxXmlNode::DoCopy(const wxXmlNode& node)
     m_type = node.m_type;
     m_name = node.m_name;
     m_content = node.m_content;
+    m_lineNo = node.m_lineNo;
     m_children = NULL;
 
     wxXmlNode *n = node.m_children;
@@ -116,49 +124,51 @@ void wxXmlNode::DoCopy(const wxXmlNode& node)
         n = n->GetNext();
     }
 
-    m_properties = NULL;
-    wxXmlProperty *p = node.m_properties;
+    m_attrs = NULL;
+    wxXmlAttribute *p = node.m_attrs;
     while (p)
     {
-       AddProperty(p->GetName(), p->GetValue());
+       AddAttribute(p->GetName(), p->GetValue());
        p = p->GetNext();
     }
 }
 
-bool wxXmlNode::HasProp(const wxString& propName) const
+bool wxXmlNode::HasAttribute(const wxString& attrName) const
 {
-    wxXmlProperty *prop = GetProperties();
+    wxXmlAttribute *attr = GetAttributes();
 
-    while (prop)
+    while (attr)
     {
-        if (prop->GetName() == propName) return true;
-        prop = prop->GetNext();
+        if (attr->GetName() == attrName) return true;
+        attr = attr->GetNext();
     }
 
     return false;
 }
 
-bool wxXmlNode::GetPropVal(const wxString& propName, wxString *value) const
+bool wxXmlNode::GetAttribute(const wxString& attrName, wxString *value) const
 {
-    wxXmlProperty *prop = GetProperties();
+    wxCHECK_MSG( value, false, "value argument must not be NULL" );
+
+    wxXmlAttribute *attr = GetAttributes();
 
-    while (prop)
+    while (attr)
     {
-        if (prop->GetName() == propName)
+        if (attr->GetName() == attrName)
         {
-            *value = prop->GetValue();
+            *value = attr->GetValue();
             return true;
         }
-        prop = prop->GetNext();
+        attr = attr->GetNext();
     }
 
     return false;
 }
 
-wxString wxXmlNode::GetPropVal(const wxString& propName, const wxString& defaultVal) const
+wxString wxXmlNode::GetAttribute(const wxString& attrName, const wxString& defaultVal) const
 {
     wxString tmp;
-    if (GetPropVal(propName, &tmp))
+    if (GetAttribute(attrName, &tmp))
         return tmp;
 
     return defaultVal;
@@ -178,21 +188,70 @@ void wxXmlNode::AddChild(wxXmlNode *child)
     child->m_parent = this;
 }
 
-void wxXmlNode::InsertChild(wxXmlNode *child, wxXmlNode *before_node)
+// inserts a new node in front of 'followingNode'
+bool wxXmlNode::InsertChild(wxXmlNode *child, wxXmlNode *followingNode)
 {
-    wxASSERT_MSG(before_node->GetParent() == this, wxT("wxXmlNode::InsertChild - the node has incorrect parent"));
+    wxCHECK_MSG( child, false, "cannot insert a NULL node!" );
+    wxCHECK_MSG( child->m_parent == NULL, false, "node already has a parent" );
+    wxCHECK_MSG( child->m_next == NULL, false, "node already has m_next" );
+    wxCHECK_MSG( followingNode == NULL || followingNode->GetParent() == this,
+                 false,
+                 "wxXmlNode::InsertChild - followingNode has incorrect parent" );
+
+    // this is for backward compatibility, NULL was allowed here thanks to
+    // the confusion about followingNode's meaning
+    if ( followingNode == NULL )
+        followingNode = m_children;
 
-    if (m_children == before_node)
-       m_children = child;
+    if ( m_children == followingNode )
+    {
+        child->m_next = m_children;
+        m_children = child;
+    }
     else
     {
         wxXmlNode *ch = m_children;
-        while (ch->m_next != before_node) ch = ch->m_next;
+        while ( ch && ch->m_next != followingNode )
+            ch = ch->m_next;
+        if ( !ch )
+        {
+            wxFAIL_MSG( "followingNode has this node as parent, but couldn't be found among children" );
+            return false;
+        }
+
+        child->m_next = followingNode;
         ch->m_next = child;
     }
 
     child->m_parent = this;
-    child->m_next = before_node;
+    return true;
+}
+
+// inserts a new node right after 'precedingNode'
+bool wxXmlNode::InsertChildAfter(wxXmlNode *child, wxXmlNode *precedingNode)
+{
+    wxCHECK_MSG( child, false, "cannot insert a NULL node!" );
+    wxCHECK_MSG( child->m_parent == NULL, false, "node already has a parent" );
+    wxCHECK_MSG( child->m_next == NULL, false, "node already has m_next" );
+    wxCHECK_MSG( precedingNode == NULL || precedingNode->m_parent == this, false,
+                 "precedingNode has wrong parent" );
+
+    if ( precedingNode )
+    {
+        child->m_next = precedingNode->m_next;
+        precedingNode->m_next = child;
+    }
+    else // precedingNode == NULL
+    {
+        wxCHECK_MSG( m_children == NULL, false,
+                     "NULL precedingNode only makes sense when there are no children" );
+
+        child->m_next = m_children;
+        m_children = child;
+    }
+
+    child->m_parent = this;
+    return true;
 }
 
 bool wxXmlNode::RemoveChild(wxXmlNode *child)
@@ -224,50 +283,65 @@ bool wxXmlNode::RemoveChild(wxXmlNode *child)
     }
 }
 
+void wxXmlNode::AddAttribute(const wxString& name, const wxString& value)
+{
+    AddProperty(name, value);
+}
+
+void wxXmlNode::AddAttribute(wxXmlAttribute *attr)
+{
+    AddProperty(attr);
+}
+
+bool wxXmlNode::DeleteAttribute(const wxString& name)
+{
+    return DeleteProperty(name);
+}
+
 void wxXmlNode::AddProperty(const wxString& name, const wxString& value)
 {
-    AddProperty(new wxXmlProperty(name, value, NULL));
+    AddProperty(new wxXmlAttribute(name, value, NULL));
 }
 
-void wxXmlNode::AddProperty(wxXmlProperty *prop)
+void wxXmlNode::AddProperty(wxXmlAttribute *attr)
 {
-    if (m_properties == NULL)
-        m_properties = prop;
+    if (m_attrs == NULL)
+        m_attrs = attr;
     else
     {
-        wxXmlProperty *p = m_properties;
+        wxXmlAttribute *p = m_attrs;
         while (p->GetNext()) p = p->GetNext();
-        p->SetNext(prop);
+        p->SetNext(attr);
     }
 }
 
 bool wxXmlNode::DeleteProperty(const wxString& name)
 {
-    wxXmlProperty *prop;
+    wxXmlAttribute *attr;
 
-    if (m_properties == NULL)
+    if (m_attrs == NULL)
         return false;
 
-    else if (m_properties->GetName() == name)
+    else if (m_attrs->GetName() == name)
     {
-        prop = m_properties;
-        m_properties = prop->GetNext();
-        prop->SetNext(NULL);
-        delete prop;
+        attr = m_attrs;
+        m_attrs = attr->GetNext();
+        attr->SetNext(NULL);
+        delete attr;
         return true;
     }
 
     else
     {
-        wxXmlProperty *p = m_properties;
+        wxXmlAttribute *p = m_attrs;
         while (p->GetNext())
         {
             if (p->GetNext()->GetName() == name)
             {
-                prop = p->GetNext();
-                p->SetNext(prop->GetNext());
-                prop->SetNext(NULL);
-                delete prop;
+                attr = p->GetNext();
+                p->SetNext(attr->GetNext());
+                attr->SetNext(NULL);
+                delete attr;
                 return true;
             }
             p = p->GetNext();
@@ -290,6 +364,28 @@ wxString wxXmlNode::GetNodeContent() const
     return wxEmptyString;
 }
 
+int wxXmlNode::GetDepth(wxXmlNode *grandparent) const
+{
+    const wxXmlNode *n = this;
+    int ret = -1;
+
+    do
+    {
+        ret++;
+        n = n->GetParent();
+        if (n == grandparent)
+            return ret;
+
+    } while (n);
+
+    return wxNOT_FOUND;
+}
+
+bool wxXmlNode::IsWhitespaceOnly() const
+{
+    return wxIsWhiteOnly(m_content);
+}
+
 
 
 //-----------------------------------------------------------------------------
@@ -297,10 +393,10 @@ wxString wxXmlNode::GetNodeContent() 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_root(NULL)
 {
 #if !wxUSE_UNICODE
-    m_encoding = wxT("UTF-8");
+    m_encoding = wxS("UTF-8");
 #endif
 }
 
@@ -342,23 +438,27 @@ void wxXmlDocument::DoCopy(const wxXmlDocument& doc)
     m_encoding = doc.m_encoding;
 #endif
     m_fileEncoding = doc.m_fileEncoding;
-    m_root = new wxXmlNode(*doc.m_root);
+
+    if (doc.m_root)
+        m_root = new wxXmlNode(*doc.m_root);
+    else
+        m_root = NULL;
 }
 
-bool wxXmlDocument::Load(const wxString& filename, const wxString& encoding)
+bool wxXmlDocument::Load(const wxString& filename, const wxString& encoding, int flags)
 {
     wxFileInputStream stream(filename);
     if (!stream.Ok())
         return false;
-    return Load(stream, encoding);
+    return Load(stream, encoding, flags);
 }
 
-bool wxXmlDocument::Save(const wxString& filename) const
+bool wxXmlDocument::Save(const wxString& filename, int indentstep) const
 {
     wxFileOutputStream stream(filename);
     if (!stream.Ok())
         return false;
-    return Save(stream);
+    return Save(stream, indentstep);
 }
 
 
@@ -367,130 +467,179 @@ bool wxXmlDocument::Save(const wxString& filename) const
 //  wxXmlDocument loading routines
 //-----------------------------------------------------------------------------
 
-/*
-    FIXME:
-       - process all elements, including CDATA
- */
-
 // converts Expat-produced string in UTF-8 into wxString using the specified
 // conv or keep in UTF-8 if conv is NULL
 static wxString CharToString(wxMBConv *conv,
-                                    const char *s, size_t len = wxSTRING_MAXLEN)
+                             const char *s, size_t len = wxString::npos)
 {
-#if wxUSE_UNICODE
-    wxUnusedVar(conv);
-
-    return wxString(s, wxConvUTF8, len);
-#else // !wxUSE_UNICODE
+#if !wxUSE_UNICODE
     if ( conv )
     {
         // there can be no embedded NULs in this string so we don't need the
         // output length, it will be NUL-terminated
         const wxWCharBuffer wbuf(
-            wxConvUTF8.cMB2WC(s, len == wxSTRING_MAXLEN ? wxNO_LEN : len, NULL));
+            wxConvUTF8.cMB2WC(s, len == wxString::npos ? wxNO_LEN : len, NULL));
 
         return wxString(wbuf, *conv);
     }
-    else // already in UTF-8, no conversion needed
+    // else: the string is wanted in UTF-8
+#endif // !wxUSE_UNICODE
+
+    wxUnusedVar(conv);
+    return wxString::FromUTF8Unchecked(s, len);
+}
+
+// returns true if the given string contains only whitespaces
+bool wxIsWhiteOnly(const wxString& buf)
+{
+    for ( wxString::const_iterator i = buf.begin(); i != buf.end(); ++i )
     {
-        return wxString(s, len != wxSTRING_MAXLEN ? len : strlen(s));
+        wxChar c = *i;
+        if ( c != wxS(' ') && c != wxS('\t') && c != wxS('\n') && c != wxS('\r'))
+            return false;
     }
-#endif // wxUSE_UNICODE/!wxUSE_UNICODE
+    return true;
 }
 
+
 struct wxXmlParsingContext
 {
+    wxXmlParsingContext()
+        : conv(NULL),
+          root(NULL),
+          node(NULL),
+          lastChild(NULL),
+          lastAsText(NULL),
+          removeWhiteOnlyNodes(false)
+    {}
+
+    XML_Parser parser;
     wxMBConv  *conv;
     wxXmlNode *root;
-    wxXmlNode *node;
-    wxXmlNode *lastAsText;
+    wxXmlNode *node;                    // the node being parsed
+    wxXmlNode *lastChild;               // the last child of "node"
+    wxXmlNode *lastAsText;              // the last _text_ child of "node"
     wxString   encoding;
     wxString   version;
+    bool       removeWhiteOnlyNodes;
 };
 
+// checks that ctx->lastChild is in consistent state
+#define ASSERT_LAST_CHILD_OK(ctx)                                   \
+    wxASSERT( ctx->lastChild == NULL ||                             \
+              ctx->lastChild->GetNext() == NULL );                  \
+    wxASSERT( ctx->lastChild == NULL ||                             \
+              ctx->lastChild->GetParent() == ctx->node )
+
 extern "C" {
 static void StartElementHnd(void *userData, const char *name, const char **atts)
 {
     wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
-    wxXmlNode *node = new wxXmlNode(wxXML_ELEMENT_NODE, CharToString(ctx->conv, name));
+    wxXmlNode *node = new wxXmlNode(wxXML_ELEMENT_NODE,
+                                    CharToString(ctx->conv, name),
+                                    wxEmptyString,
+                                    XML_GetCurrentLineNumber(ctx->parser));
     const char **a = atts;
+
+    // add node attributes
     while (*a)
     {
-        node->AddProperty(CharToString(ctx->conv, a[0]), CharToString(ctx->conv, a[1]));
+        node->AddAttribute(CharToString(ctx->conv, a[0]), CharToString(ctx->conv, a[1]));
         a += 2;
     }
+
     if (ctx->root == NULL)
+    {
         ctx->root = node;
+    }
     else
-        ctx->node->AddChild(node);
-    ctx->node = node;
+    {
+        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
+
+    ctx->node = node;
 }
 
-extern "C" {
 static void EndElementHnd(void *userData, const char* WXUNUSED(name))
 {
     wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
 
+    // we're exiting the last children of ctx->node->GetParent() and going
+    // back one level up, so current value of ctx->node points to the last
+    // child of ctx->node->GetParent()
+    ctx->lastChild = ctx->node;
+
     ctx->node = ctx->node->GetParent();
     ctx->lastAsText = NULL;
 }
-}
 
-extern "C" {
 static void TextHnd(void *userData, const char *s, int len)
 {
     wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
-    char *buf = new char[len + 1];
-
-    buf[len] = '\0';
-    memcpy(buf, s, (size_t)len);
+    wxString str = CharToString(ctx->conv, s, len);
 
     if (ctx->lastAsText)
     {
-        ctx->lastAsText->SetContent(ctx->lastAsText->GetContent() +
-                                    CharToString(ctx->conv, buf));
+        ctx->lastAsText->SetContent(ctx->lastAsText->GetContent() + str);
     }
     else
     {
-        bool whiteOnly = true;
-        for (char *c = buf; *c != '\0'; c++)
-            if (*c != ' ' && *c != '\t' && *c != '\n' && *c != '\r')
-            {
-                whiteOnly = false;
-                break;
-            }
+        bool whiteOnly = false;
+        if (ctx->removeWhiteOnlyNodes)
+            whiteOnly = wxIsWhiteOnly(str);
+
         if (!whiteOnly)
         {
-            ctx->lastAsText = new wxXmlNode(wxXML_TEXT_NODE, wxT("text"),
-                                            CharToString(ctx->conv, buf));
-            ctx->node->AddChild(ctx->lastAsText);
+            wxXmlNode *textnode =
+                new wxXmlNode(wxXML_TEXT_NODE, wxS("text"), str,
+                              XML_GetCurrentLineNumber(ctx->parser));
+
+            ASSERT_LAST_CHILD_OK(ctx);
+            ctx->node->InsertChildAfter(textnode, ctx->lastChild);
+            ctx->lastChild= ctx->lastAsText = textnode;
         }
     }
-
-    delete[] buf;
 }
+
+static void StartCdataHnd(void *userData)
+{
+    wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
+
+    wxXmlNode *textnode =
+        new wxXmlNode(wxXML_CDATA_SECTION_NODE, wxS("cdata"), wxS(""),
+                      XML_GetCurrentLineNumber(ctx->parser));
+
+    ASSERT_LAST_CHILD_OK(ctx);
+    ctx->node->InsertChildAfter(textnode, ctx->lastChild);
+    ctx->lastChild= ctx->lastAsText = textnode;
 }
 
-extern "C" {
 static void CommentHnd(void *userData, const char *data)
 {
     wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
 
     if (ctx->node)
     {
-        // VS: ctx->node == NULL happens if there is a comment before
-        //     the root element (e.g. wxDesigner's output). We ignore such
-        //     comments, no big deal...
-        ctx->node->AddChild(new wxXmlNode(wxXML_COMMENT_NODE,
-                            wxT("comment"), CharToString(ctx->conv, data)));
+        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).
+
     ctx->lastAsText = NULL;
 }
-}
 
-extern "C" {
 static void DefaultHnd(void *userData, const char *s, int len)
 {
     // XML header:
@@ -500,25 +649,22 @@ 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]);
     }
 }
-}
 
-extern "C" {
 static int UnknownEncodingHnd(void * WXUNUSED(encodingHandlerData),
                               const XML_Char *name, XML_Encoding *info)
 {
     // We must build conversion table for expat. The easiest way to do so
     // is to let wxCSConv convert as string containing all characters to
     // wide character representation:
-    wxString str(name, wxConvLibc);
-    wxCSConv conv(str);
+    wxCSConv conv(name);
     char mbBuf[2];
     wchar_t wcBuf[10];
     size_t i;
@@ -542,9 +688,10 @@ static int UnknownEncodingHnd(void * WXUNUSED(encodingHandlerData),
 
     return 1;
 }
-}
 
-bool wxXmlDocument::Load(wxInputStream& stream, const wxString& encoding)
+} // extern "C"
+
+bool wxXmlDocument::Load(wxInputStream& stream, const wxString& encoding, int flags)
 {
 #if wxUSE_UNICODE
     (void)encoding;
@@ -558,17 +705,19 @@ bool wxXmlDocument::Load(wxInputStream& stream, const wxString& encoding)
     bool done;
     XML_Parser parser = XML_ParserCreate(NULL);
 
-    ctx.root = ctx.node = NULL;
-    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 != wxT("UTF-8") && encoding != wxT("utf-8") )
+    if ( encoding.CmpNoCase(wxS("UTF-8")) != 0 )
         ctx.conv = new wxCSConv(encoding);
 #endif
+    ctx.removeWhiteOnlyNodes = (flags & wxXMLDOC_KEEP_WHITESPACE_NODES) == 0;
+    ctx.parser = parser;
 
     XML_SetUserData(parser, (void*)&ctx);
     XML_SetElementHandler(parser, StartElementHnd, EndElementHnd);
     XML_SetCharacterDataHandler(parser, TextHnd);
+    XML_SetStartCdataSectionHandler(parser, StartCdataHnd);
     XML_SetCommentHandler(parser, CommentHnd);
     XML_SetDefaultHandler(parser, DefaultHnd);
     XML_SetUnknownEncodingHandler(parser, UnknownEncodingHnd, NULL);
@@ -619,30 +768,40 @@ bool wxXmlDocument::Load(wxInputStream& stream, const wxString& encoding)
 //  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);
 
     const wxWX2MBbuf buf(str.mb_str(*(convFile ? convFile : &wxConvUTF8)));
-    stream.Write((const char*)buf, strlen((const char*)buf));
+    if ( !buf )
+        return false;
+
+    stream.Write(buf, strlen(buf));
 #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()
@@ -653,149 +812,193 @@ enum
 
 // 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;
+bool OutputStringEnt(wxOutputStream& stream,
+                     const wxString& str,
+                     wxMBConv *convMem,
+                     wxMBConv *convFile,
+                     int flags = 0)
+{
+    const size_t len = str.length();
+    size_t i,
+           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('"')))
+        wxChar c = str.GetChar(i);
+        if (c == wxS('<') || c == wxS('>') ||
+            (c == wxS('&') && str.substr(i+1, 4) != wxS("amp;")) ||
+            ((flags & XML_ESCAPE_QUOTES) && c == wxS('"')))
         {
-            OutputString(stream, str.Mid(last, i - last), convMem, convFile);
-            switch (c)
+            if ( !OutputString(stream, str.substr(last, i - last),
+                               convMem, convFile) )
+                return false;
+
+            const char *escaped;
+            switch ( c )
             {
-                case wxT('<'):
-                    OutputString(stream, wxT("&lt;"));
+                case wxS('<'):
+                    escaped = "&lt;";
                     break;
-                case wxT('>'):
-                    OutputString(stream, wxT("&gt;"));
+                case wxS('>'):
+                    escaped = "&gt;";
                     break;
-                case wxT('&'):
-                    OutputString(stream, wxT("&amp;"));
+                case wxS('&'):
+                    escaped = "&amp;";
                     break;
-                case wxT('"'):
-                    OutputString(stream, wxT("&quot;"));
+                case wxS('"'):
+                    escaped = "&quot;";
                     break;
                 default:
-                    break;
+                    wxFAIL_MSG( "logic error in the code" );
+                    return false;
             }
+
+            if ( !OutputString(stream, escaped, convMem, convFile) )
+                return false;
+
             last = i + 1;
         }
     }
-    OutputString(stream, str.Mid(last, i - last), convMem, convFile);
+
+    return OutputString(stream, str.substr(last, i - last), 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(2*indent, wxS(' '));
+    return OutputString(stream, str, convMem, convFile);
 }
 
-static void OutputNode(wxOutputStream& stream, wxXmlNode *node, int indent,
-                       wxMBConv *convMem, wxMBConv *convFile)
+bool OutputNode(wxOutputStream& stream,
+                wxXmlNode *node,
+                int indent,
+                wxMBConv *convMem,
+                wxMBConv *convFile,
+                int indentstep)
 {
-    wxXmlNode *n, *prev;
-    wxXmlProperty *prop;
-
+    bool rc;
     switch (node->GetType())
     {
+        case wxXML_CDATA_SECTION_NODE:
+            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);
+            rc = OutputStringEnt(stream, node->GetContent(), convMem, convFile);
             break;
 
         case wxXML_ELEMENT_NODE:
-            OutputString(stream, wxT("<"));
-            OutputString(stream, node->GetName());
+            rc = OutputString(stream, wxS("<"), convMem, convFile) &&
+                 OutputString(stream, node->GetName(), convMem, convFile);
 
-            prop = node->GetProperties();
-            while (prop)
+            if ( rc )
             {
-                OutputString(stream, wxT(" ") + prop->GetName() +  wxT("=\""));
-                OutputStringEnt(stream, prop->GetValue(), convMem, convFile,
-                                XML_ESCAPE_QUOTES);
-                OutputString(stream, wxT("\""));
-                prop = prop->GetNext();
+                for ( wxXmlAttribute *attr = node->GetAttributes();
+                      attr && rc;
+                      attr = attr->GetNext() )
+                {
+                    rc = OutputString(stream,
+                                      wxS(" ") + attr->GetName() +  wxS("=\""),
+                                      convMem, convFile) &&
+                         OutputStringEnt(stream, attr->GetValue(),
+                                         convMem, convFile,
+                                         XML_ESCAPE_QUOTES) &&
+                         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 (n && n->GetType() != wxXML_TEXT_NODE)
-                        OutputIndentation(stream, indent + 1);
-                    OutputNode(stream, n, indent + 1, convMem, convFile);
+                    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 (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;
 
         default:
-            wxFAIL_MSG(wxT("unsupported node type"));
+            wxFAIL_MSG("unsupported node type");
+            rc = false;
     }
+
+    return rc;
 }
 
-bool wxXmlDocument::Save(wxOutputStream& stream) const
+} // anonymous namespace
+
+bool wxXmlDocument::Save(wxOutputStream& stream, int indentstep) const
 {
     if ( !IsOk() )
         return false;
 
-    wxString s;
-
-    wxMBConv *convMem = NULL;
+    wxScopedPtr<wxMBConv> convMem, convFile;
 
 #if wxUSE_UNICODE
-    wxMBConv *convFile = new wxCSConv(GetFileEncoding());
+    convFile.reset(new wxCSConv(GetFileEncoding()));
 #else
-    wxMBConv *convFile = NULL;
-    if ( GetFileEncoding() != GetEncoding() )
+    if ( GetFileEncoding().CmpNoCase(GetEncoding()) != 0 )
     {
-        convFile = new wxCSConv(GetFileEncoding());
-        convMem = new wxCSConv(GetEncoding());
+        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);
-
-    OutputNode(stream, GetRoot(), 0, convMem, convFile);
-    OutputString(stream, wxT("\n"));
-
-    if ( convFile )
-        delete convFile;
-    if ( convMem )
-        delete convMem;
-
-    return true;
+    return OutputString(stream,
+                        wxString::Format
+                        (
+                         wxS("<?xml version=\"%s\" encoding=\"%s\"?>\n"),
+                         GetVersion(), GetFileEncoding()
+                        ),
+                        convMem.get(),
+                        convFile.get()) &&
+           OutputNode(stream, GetRoot(), 0,
+                      convMem.get(), convFile.get(), indentstep) &&
+           OutputString(stream, wxS("\n"), convMem.get(), convFile.get());
 }
 
 #endif // wxUSE_XML