src/xml/xml.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/xml/xml.cpp
   3 // Purpose:     wxXmlDocument - XML parser & data holder class
   4 // Author:      Vaclav Slavik
   5 // Created:     2000/03/05
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2000 Vaclav Slavik
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // For compilers that support precompilation, includes "wx.h".
  12 #include "wx/wxprec.h"
  13
  14 #ifdef __BORLANDC__
  15     #pragma hdrstop
  16 #endif
  17
  18 #if wxUSE_XML
  19
  20 #include "wx/xml/xml.h"
  21
  22 #ifndef WX_PRECOMP
  23     #include "wx/intl.h"
  24     #include "wx/log.h"
  25     #include "wx/app.h"
  26 #endif
  27
  28 #include "wx/wfstream.h"
  29 #include "wx/datstrm.h"
  30 #include "wx/zstream.h"
  31 #include "wx/strconv.h"
  32
  33 #include "expat.h" // from Expat
  34
  35 // DLL options compatibility check:
  36 WX_CHECK_BUILD_OPTIONS("wxXML")
  37
  38
  39 IMPLEMENT_CLASS(wxXmlDocument, wxObject)
  40
  41
  42
  43 //-----------------------------------------------------------------------------
  44 //  wxXmlNode
  45 //-----------------------------------------------------------------------------
  46
  47 wxXmlNode::wxXmlNode(wxXmlNode *parent,wxXmlNodeType type,
  48                      const wxString& name, const wxString& content,
  49                      wxXmlProperty *props, wxXmlNode *next)
  50     : m_type(type), m_name(name), m_content(content),
  51       m_properties(props), m_parent(parent),
  52       m_children(NULL), m_next(next)
  53 {
  54     if (m_parent)
  55     {
  56         if (m_parent->m_children)
  57         {
  58             m_next = m_parent->m_children;
  59             m_parent->m_children = this;
  60         }
  61         else
  62             m_parent->m_children = this;
  63     }
  64 }
  65
  66 wxXmlNode::wxXmlNode(wxXmlNodeType type, const wxString& name,
  67                      const wxString& content)
  68     : m_type(type), m_name(name), m_content(content),
  69       m_properties(NULL), m_parent(NULL),
  70       m_children(NULL), m_next(NULL)
  71 {}
  72
  73 wxXmlNode::wxXmlNode(const wxXmlNode& node)
  74 {
  75     m_next = NULL;
  76     m_parent = NULL;
  77     DoCopy(node);
  78 }
  79
  80 wxXmlNode::~wxXmlNode()
  81 {
  82     wxXmlNode *c, *c2;
  83     for (c = m_children; c; c = c2)
  84     {
  85         c2 = c->m_next;
  86         delete c;
  87     }
  88
  89     wxXmlProperty *p, *p2;
  90     for (p = m_properties; p; p = p2)
  91     {
  92         p2 = p->GetNext();
  93         delete p;
  94     }
  95 }
  96
  97 wxXmlNode& wxXmlNode::operator=(const wxXmlNode& node)
  98 {
  99     wxDELETE(m_properties);
 100     wxDELETE(m_children);
 101     DoCopy(node);
 102     return *this;
 103 }
 104
 105 void wxXmlNode::DoCopy(const wxXmlNode& node)
 106 {
 107     m_type = node.m_type;
 108     m_name = node.m_name;
 109     m_content = node.m_content;
 110     m_children = NULL;
 111
 112     wxXmlNode *n = node.m_children;
 113     while (n)
 114     {
 115         AddChild(new wxXmlNode(*n));
 116         n = n->GetNext();
 117     }
 118
 119     m_properties = NULL;
 120     wxXmlProperty *p = node.m_properties;
 121     while (p)
 122     {
 123        AddProperty(p->GetName(), p->GetValue());
 124        p = p->GetNext();
 125     }
 126 }
 127
 128 bool wxXmlNode::HasProp(const wxString& propName) const
 129 {
 130     wxXmlProperty *prop = GetProperties();
 131
 132     while (prop)
 133     {
 134         if (prop->GetName() == propName) return true;
 135         prop = prop->GetNext();
 136     }
 137
 138     return false;
 139 }
 140
 141 bool wxXmlNode::GetPropVal(const wxString& propName, wxString *value) const
 142 {
 143     wxXmlProperty *prop = GetProperties();
 144
 145     while (prop)
 146     {
 147         if (prop->GetName() == propName)
 148         {
 149             *value = prop->GetValue();
 150             return true;
 151         }
 152         prop = prop->GetNext();
 153     }
 154
 155     return false;
 156 }
 157
 158 wxString wxXmlNode::GetPropVal(const wxString& propName, const wxString& defaultVal) const
 159 {
 160     wxString tmp;
 161     if (GetPropVal(propName, &tmp))
 162         return tmp;
 163
 164     return defaultVal;
 165 }
 166
 167 void wxXmlNode::AddChild(wxXmlNode *child)
 168 {
 169     if (m_children == NULL)
 170         m_children = child;
 171     else
 172     {
 173         wxXmlNode *ch = m_children;
 174         while (ch->m_next) ch = ch->m_next;
 175         ch->m_next = child;
 176     }
 177     child->m_next = NULL;
 178     child->m_parent = this;
 179 }
 180
 181 void wxXmlNode::InsertChild(wxXmlNode *child, wxXmlNode *before_node)
 182 {
 183     wxASSERT_MSG(before_node->GetParent() == this, wxT("wxXmlNode::InsertChild - the node has incorrect parent"));
 184
 185     if (m_children == before_node)
 186        m_children = child;
 187     else
 188     {
 189         wxXmlNode *ch = m_children;
 190         while (ch->m_next != before_node) ch = ch->m_next;
 191         ch->m_next = child;
 192     }
 193
 194     child->m_parent = this;
 195     child->m_next = before_node;
 196 }
 197
 198 bool wxXmlNode::RemoveChild(wxXmlNode *child)
 199 {
 200     if (m_children == NULL)
 201         return false;
 202     else if (m_children == child)
 203     {
 204         m_children = child->m_next;
 205         child->m_parent = NULL;
 206         child->m_next = NULL;
 207         return true;
 208     }
 209     else
 210     {
 211         wxXmlNode *ch = m_children;
 212         while (ch->m_next)
 213         {
 214             if (ch->m_next == child)
 215             {
 216                 ch->m_next = child->m_next;
 217                 child->m_parent = NULL;
 218                 child->m_next = NULL;
 219                 return true;
 220             }
 221             ch = ch->m_next;
 222         }
 223         return false;
 224     }
 225 }
 226
 227 void wxXmlNode::AddProperty(const wxString& name, const wxString& value)
 228 {
 229     AddProperty(new wxXmlProperty(name, value, NULL));
 230 }
 231
 232 void wxXmlNode::AddProperty(wxXmlProperty *prop)
 233 {
 234     if (m_properties == NULL)
 235         m_properties = prop;
 236     else
 237     {
 238         wxXmlProperty *p = m_properties;
 239         while (p->GetNext()) p = p->GetNext();
 240         p->SetNext(prop);
 241     }
 242 }
 243
 244 bool wxXmlNode::DeleteProperty(const wxString& name)
 245 {
 246     wxXmlProperty *prop;
 247
 248     if (m_properties == NULL)
 249         return false;
 250
 251     else if (m_properties->GetName() == name)
 252     {
 253         prop = m_properties;
 254         m_properties = prop->GetNext();
 255         prop->SetNext(NULL);
 256         delete prop;
 257         return true;
 258     }
 259
 260     else
 261     {
 262         wxXmlProperty *p = m_properties;
 263         while (p->GetNext())
 264         {
 265             if (p->GetNext()->GetName() == name)
 266             {
 267                 prop = p->GetNext();
 268                 p->SetNext(prop->GetNext());
 269                 prop->SetNext(NULL);
 270                 delete prop;
 271                 return true;
 272             }
 273             p = p->GetNext();
 274         }
 275         return false;
 276     }
 277 }
 278
 279 wxString wxXmlNode::GetNodeContent() const
 280 {
 281     wxXmlNode *n = GetChildren();
 282
 283     while (n)
 284     {
 285         if (n->GetType() == wxXML_TEXT_NODE ||
 286             n->GetType() == wxXML_CDATA_SECTION_NODE)
 287             return n->GetContent();
 288         n = n->GetNext();
 289     }
 290     return wxEmptyString;
 291 }
 292
 293
 294
 295 //-----------------------------------------------------------------------------
 296 //  wxXmlDocument
 297 //-----------------------------------------------------------------------------
 298
 299 wxXmlDocument::wxXmlDocument()
 300     : m_version(wxT("1.0")), m_fileEncoding(wxT("utf-8")), m_root(NULL)
 301 {
 302 #if !wxUSE_UNICODE
 303     m_encoding = wxT("UTF-8");
 304 #endif
 305 }
 306
 307 wxXmlDocument::wxXmlDocument(const wxString& filename, const wxString& encoding)
 308               :wxObject(), m_root(NULL)
 309 {
 310     if ( !Load(filename, encoding) )
 311     {
 312         wxDELETE(m_root);
 313     }
 314 }
 315
 316 wxXmlDocument::wxXmlDocument(wxInputStream& stream, const wxString& encoding)
 317               :wxObject(), m_root(NULL)
 318 {
 319     if ( !Load(stream, encoding) )
 320     {
 321         wxDELETE(m_root);
 322     }
 323 }
 324
 325 wxXmlDocument::wxXmlDocument(const wxXmlDocument& doc)
 326               :wxObject()
 327 {
 328     DoCopy(doc);
 329 }
 330
 331 wxXmlDocument& wxXmlDocument::operator=(const wxXmlDocument& doc)
 332 {
 333     wxDELETE(m_root);
 334     DoCopy(doc);
 335     return *this;
 336 }
 337
 338 void wxXmlDocument::DoCopy(const wxXmlDocument& doc)
 339 {
 340     m_version = doc.m_version;
 341 #if !wxUSE_UNICODE
 342     m_encoding = doc.m_encoding;
 343 #endif
 344     m_fileEncoding = doc.m_fileEncoding;
 345     m_root = new wxXmlNode(*doc.m_root);
 346 }
 347
 348 bool wxXmlDocument::Load(const wxString& filename, const wxString& encoding)
 349 {
 350     wxFileInputStream stream(filename);
 351     return Load(stream, encoding);
 352 }
 353
 354 bool wxXmlDocument::Save(const wxString& filename) const
 355 {
 356     wxFileOutputStream stream(filename);
 357     return Save(stream);
 358 }
 359
 360
 361
 362 //-----------------------------------------------------------------------------
 363 //  wxXmlDocument loading routines
 364 //-----------------------------------------------------------------------------
 365
 366 /*
 367     FIXME:
 368        - process all elements, including CDATA
 369  */
 370
 371 // converts Expat-produced string in UTF-8 into wxString using the specified
 372 // conv or keep in UTF-8 if conv is NULL
 373 static wxString CharToString(wxMBConv *conv,
 374                                     const char *s, size_t len = wxSTRING_MAXLEN)
 375 {
 376 #if wxUSE_UNICODE
 377     wxUnusedVar(conv);
 378
 379     return wxString(s, wxConvUTF8, len);
 380 #else // !wxUSE_UNICODE
 381     if ( conv )
 382     {
 383         // there can be no embedded NULs in this string so we don't need the
 384         // output length, it will be NUL-terminated
 385         const wxWCharBuffer wbuf(
 386             wxConvUTF8.cMB2WC(s, len == wxSTRING_MAXLEN ? wxNO_LEN : len, NULL));
 387
 388         return wxString(wbuf, conv);
 389     }
 390     else // already in UTF-8, no conversion needed
 391     {
 392         return wxString(s, len != wxSTRING_MAXLEN ? len : strlen(s));
 393     }
 394 #endif // wxUSE_UNICODE/!wxUSE_UNICODE
 395 }
 396
 397 struct wxXmlParsingContext
 398 {
 399     wxMBConv  *conv;
 400     wxXmlNode *root;
 401     wxXmlNode *node;
 402     wxXmlNode *lastAsText;
 403     wxString   encoding;
 404     wxString   version;
 405 };
 406
 407 extern "C" {
 408 static void StartElementHnd(void *userData, const char *name, const char **atts)
 409 {
 410     wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
 411     wxXmlNode *node = new wxXmlNode(wxXML_ELEMENT_NODE, CharToString(ctx->conv, name));
 412     const char **a = atts;
 413     while (*a)
 414     {
 415         node->AddProperty(CharToString(ctx->conv, a[0]), CharToString(ctx->conv, a[1]));
 416         a += 2;
 417     }
 418     if (ctx->root == NULL)
 419         ctx->root = node;
 420     else
 421         ctx->node->AddChild(node);
 422     ctx->node = node;
 423     ctx->lastAsText = NULL;
 424 }
 425 }
 426
 427 extern "C" {
 428 static void EndElementHnd(void *userData, const char* WXUNUSED(name))
 429 {
 430     wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
 431
 432     ctx->node = ctx->node->GetParent();
 433     ctx->lastAsText = NULL;
 434 }
 435 }
 436
 437 extern "C" {
 438 static void TextHnd(void *userData, const char *s, int len)
 439 {
 440     wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
 441     char *buf = new char[len + 1];
 442
 443     buf[len] = '\0';
 444     memcpy(buf, s, (size_t)len);
 445
 446     if (ctx->lastAsText)
 447     {
 448         ctx->lastAsText->SetContent(ctx->lastAsText->GetContent() +
 449                                     CharToString(ctx->conv, buf));
 450     }
 451     else
 452     {
 453         bool whiteOnly = true;
 454         for (char *c = buf; *c != '\0'; c++)
 455             if (*c != ' ' && *c != '\t' && *c != '\n' && *c != '\r')
 456             {
 457                 whiteOnly = false;
 458                 break;
 459             }
 460         if (!whiteOnly)
 461         {
 462             ctx->lastAsText = new wxXmlNode(wxXML_TEXT_NODE, wxT("text"),
 463                                             CharToString(ctx->conv, buf));
 464             ctx->node->AddChild(ctx->lastAsText);
 465         }
 466     }
 467
 468     delete[] buf;
 469 }
 470 }
 471
 472 extern "C" {
 473 static void CommentHnd(void *userData, const char *data)
 474 {
 475     wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
 476
 477     if (ctx->node)
 478     {
 479         // VS: ctx->node == NULL happens if there is a comment before
 480         //     the root element (e.g. wxDesigner's output). We ignore such
 481         //     comments, no big deal...
 482         ctx->node->AddChild(new wxXmlNode(wxXML_COMMENT_NODE,
 483                             wxT("comment"), CharToString(ctx->conv, data)));
 484     }
 485     ctx->lastAsText = NULL;
 486 }
 487 }
 488
 489 extern "C" {
 490 static void DefaultHnd(void *userData, const char *s, int len)
 491 {
 492     // XML header:
 493     if (len > 6 && memcmp(s, "<?xml ", 6) == 0)
 494     {
 495         wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData;
 496
 497         wxString buf = CharToString(ctx->conv, s, (size_t)len);
 498         int pos;
 499         pos = buf.Find(wxT("encoding="));
 500         if (pos != wxNOT_FOUND)
 501             ctx->encoding = buf.Mid(pos + 10).BeforeFirst(buf[(size_t)pos+9]);
 502         pos = buf.Find(wxT("version="));
 503         if (pos != wxNOT_FOUND)
 504             ctx->version = buf.Mid(pos + 9).BeforeFirst(buf[(size_t)pos+8]);
 505     }
 506 }
 507 }
 508
 509 extern "C" {
 510 static int UnknownEncodingHnd(void * WXUNUSED(encodingHandlerData),
 511                               const XML_Char *name, XML_Encoding *info)
 512 {
 513     // We must build conversion table for expat. The easiest way to do so
 514     // is to let wxCSConv convert as string containing all characters to
 515     // wide character representation:
 516     wxString str(name, wxConvLibc);
 517     wxCSConv conv(str);
 518     char mbBuf[2];
 519     wchar_t wcBuf[10];
 520     size_t i;
 521
 522     mbBuf[1] = 0;
 523     info->map[0] = 0;
 524     for (i = 0; i < 255; i++)
 525     {
 526         mbBuf[0] = (char)(i+1);
 527         if (conv.MB2WC(wcBuf, mbBuf, 2) == (size_t)-1)
 528         {
 529             // invalid/undefined byte in the encoding:
 530             info->map[i+1] = -1;
 531         }
 532         info->map[i+1] = (int)wcBuf[0];
 533     }
 534
 535     info->data = NULL;
 536     info->convert = NULL;
 537     info->release = NULL;
 538
 539     return 1;
 540 }
 541 }
 542
 543 bool wxXmlDocument::Load(wxInputStream& stream, const wxString& encoding)
 544 {
 545 #if wxUSE_UNICODE
 546     (void)encoding;
 547 #else
 548     m_encoding = encoding;
 549 #endif
 550
 551     const size_t BUFSIZE = 1024;
 552     char buf[BUFSIZE];
 553     wxXmlParsingContext ctx;
 554     bool done;
 555     XML_Parser parser = XML_ParserCreate(NULL);
 556
 557     ctx.root = ctx.node = NULL;
 558     ctx.encoding = wxT("UTF-8"); // default in absence of encoding=""
 559     ctx.conv = NULL;
 560 #if !wxUSE_UNICODE
 561     if ( encoding != wxT("UTF-8") && encoding != wxT("utf-8") )
 562         ctx.conv = new wxCSConv(encoding);
 563 #endif
 564
 565     XML_SetUserData(parser, (void*)&ctx);
 566     XML_SetElementHandler(parser, StartElementHnd, EndElementHnd);
 567     XML_SetCharacterDataHandler(parser, TextHnd);
 568     XML_SetCommentHandler(parser, CommentHnd);
 569     XML_SetDefaultHandler(parser, DefaultHnd);
 570     XML_SetUnknownEncodingHandler(parser, UnknownEncodingHnd, NULL);
 571
 572     bool ok = true;
 573     do
 574     {
 575         size_t len = stream.Read(buf, BUFSIZE).LastRead();
 576         done = (len < BUFSIZE);
 577         if (!XML_Parse(parser, buf, len, done))
 578         {
 579             wxString error(XML_ErrorString(XML_GetErrorCode(parser)),
 580                            *wxConvCurrent);
 581             wxLogError(_("XML parsing error: '%s' at line %d"),
 582                        error.c_str(),
 583                        XML_GetCurrentLineNumber(parser));
 584             ok = false;
 585             break;
 586         }
 587     } while (!done);
 588
 589     if (ok)
 590     {
 591         if (!ctx.version.empty())
 592             SetVersion(ctx.version);
 593         if (!ctx.encoding.empty())
 594             SetFileEncoding(ctx.encoding);
 595         SetRoot(ctx.root);
 596     }
 597     else
 598     {
 599         delete ctx.root;
 600     }
 601
 602     XML_ParserFree(parser);
 603 #if !wxUSE_UNICODE
 604     if ( ctx.conv )
 605         delete ctx.conv;
 606 #endif
 607
 608     return ok;
 609
 610 }
 611
 612
 613
 614 //-----------------------------------------------------------------------------
 615 //  wxXmlDocument saving routines
 616 //-----------------------------------------------------------------------------
 617
 618 // write string to output:
 619 inline static void OutputString(wxOutputStream& stream, const wxString& str,
 620                                 wxMBConv *convMem = NULL,
 621                                 wxMBConv *convFile = NULL)
 622 {
 623     if (str.empty())
 624         return;
 625
 626 #if wxUSE_UNICODE
 627     wxUnusedVar(convMem);
 628
 629     const wxWX2MBbuf buf(str.mb_str(*(convFile ? convFile : &wxConvUTF8)));
 630     stream.Write((const char*)buf, strlen((const char*)buf));
 631 #else // !wxUSE_UNICODE
 632     if ( convFile && convMem )
 633     {
 634         wxString str2(str.wc_str(*convMem), *convFile);
 635         stream.Write(str2.mb_str(), str2.Len());
 636     }
 637     else // no conversions to do
 638     {
 639         stream.Write(str.mb_str(), str.Len());
 640     }
 641 #endif // wxUSE_UNICODE/!wxUSE_UNICODE
 642 }
 643
 644 // flags for OutputStringEnt()
 645 enum
 646 {
 647     XML_ESCAPE_QUOTES = 1
 648 };
 649
 650 // Same as above, but create entities first.
 651 // Translates '<' to "&lt;", '>' to "&gt;" and '&' to "&amp;"
 652 static void OutputStringEnt(wxOutputStream& stream, const wxString& str,
 653                             wxMBConv *convMem = NULL,
 654                             wxMBConv *convFile = NULL,
 655                             int flags = 0)
 656 {
 657     wxString buf;
 658     size_t i, last, len;
 659     wxChar c;
 660
 661     len = str.Len();
 662     last = 0;
 663     for (i = 0; i < len; i++)
 664     {
 665         c = str.GetChar(i);
 666         if (c == wxT('<') || c == wxT('>') ||
 667             (c == wxT('&') && str.Mid(i+1, 4) != wxT("amp;")) ||
 668             ((flags & XML_ESCAPE_QUOTES) && c == wxT('"')))
 669         {
 670             OutputString(stream, str.Mid(last, i - last), convMem, convFile);
 671             switch (c)
 672             {
 673                 case wxT('<'):
 674                     OutputString(stream, wxT("&lt;"));
 675                     break;
 676                 case wxT('>'):
 677                     OutputString(stream, wxT("&gt;"));
 678                     break;
 679                 case wxT('&'):
 680                     OutputString(stream, wxT("&amp;"));
 681                     break;
 682                 case wxT('"'):
 683                     OutputString(stream, wxT("&quot;"));
 684                     break;
 685                 default:
 686                     break;
 687             }
 688             last = i + 1;
 689         }
 690     }
 691     OutputString(stream, str.Mid(last, i - last), convMem, convFile);
 692 }
 693
 694 inline static void OutputIndentation(wxOutputStream& stream, int indent)
 695 {
 696     wxString str = wxT("\n");
 697     for (int i = 0; i < indent; i++)
 698         str << wxT(' ') << wxT(' ');
 699     OutputString(stream, str);
 700 }
 701
 702 static void OutputNode(wxOutputStream& stream, wxXmlNode *node, int indent,
 703                        wxMBConv *convMem, wxMBConv *convFile)
 704 {
 705     wxXmlNode *n, *prev;
 706     wxXmlProperty *prop;
 707
 708     switch (node->GetType())
 709     {
 710         case wxXML_TEXT_NODE:
 711             OutputStringEnt(stream, node->GetContent(), convMem, convFile);
 712             break;
 713
 714         case wxXML_ELEMENT_NODE:
 715             OutputString(stream, wxT("<"));
 716             OutputString(stream, node->GetName());
 717
 718             prop = node->GetProperties();
 719             while (prop)
 720             {
 721                 OutputString(stream, wxT(" ") + prop->GetName() +  wxT("=\""));
 722                 OutputStringEnt(stream, prop->GetValue(), convMem, convFile,
 723                                 XML_ESCAPE_QUOTES);
 724                 OutputString(stream, wxT("\""));
 725                 prop = prop->GetNext();
 726             }
 727
 728             if (node->GetChildren())
 729             {
 730                 OutputString(stream, wxT(">"));
 731                 prev = NULL;
 732                 n = node->GetChildren();
 733                 while (n)
 734                 {
 735                     if (n && n->GetType() != wxXML_TEXT_NODE)
 736                         OutputIndentation(stream, indent + 1);
 737                     OutputNode(stream, n, indent + 1, convMem, convFile);
 738                     prev = n;
 739                     n = n->GetNext();
 740                 }
 741                 if (prev && prev->GetType() != wxXML_TEXT_NODE)
 742                     OutputIndentation(stream, indent);
 743                 OutputString(stream, wxT("</"));
 744                 OutputString(stream, node->GetName());
 745                 OutputString(stream, wxT(">"));
 746             }
 747             else
 748                 OutputString(stream, wxT("/>"));
 749             break;
 750
 751         case wxXML_COMMENT_NODE:
 752             OutputString(stream, wxT("<!--"));
 753             OutputString(stream, node->GetContent(), convMem, convFile);
 754             OutputString(stream, wxT("-->"));
 755             break;
 756
 757         default:
 758             wxFAIL_MSG(wxT("unsupported node type"));
 759     }
 760 }
 761
 762 bool wxXmlDocument::Save(wxOutputStream& stream) const
 763 {
 764     if ( !IsOk() )
 765         return false;
 766
 767     wxString s;
 768
 769     wxMBConv *convMem = NULL;
 770
 771 #if wxUSE_UNICODE
 772     wxMBConv *convFile = new wxCSConv(GetFileEncoding());
 773 #else
 774     wxMBConv *convFile = NULL;
 775     if ( GetFileEncoding() != GetEncoding() )
 776     {
 777         convFile = new wxCSConv(GetFileEncoding());
 778         convMem = new wxCSConv(GetEncoding());
 779     }
 780 #endif
 781
 782     s.Printf(wxT("<?xml version=\"%s\" encoding=\"%s\"?>\n"),
 783              GetVersion().c_str(), GetFileEncoding().c_str());
 784     OutputString(stream, s);
 785
 786     OutputNode(stream, GetRoot(), 0, convMem, convFile);
 787     OutputString(stream, wxT("\n"));
 788
 789     if ( convFile )
 790         delete convFile;
 791     if ( convMem )
 792         delete convMem;
 793
 794     return true;
 795 }
 796
 797 #endif // wxUSE_XML