xml.cpp

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/////////////////////////////////////////////////////////////////////////////
// Name:        xml.cpp
// Purpose:     wxXmlDocument - XML parser & data holder class
// Author:      Vaclav Slavik
// Created:     2000/03/05
// RCS-ID:      $Id: xml.cpp,v 1.15.2.1 2005/12/18 14:55:42 VZ Exp $
// Copyright:   (c) 2000 Vaclav Slavik
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "xml.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#include "wx/xml/xml.h"

#if wxUSE_XML

#include "wx/wfstream.h"
#include "wx/datstrm.h"
#include "wx/zstream.h"
#include "wx/log.h"
#include "wx/intl.h"
#include "wx/strconv.h"

#include "expat.h" // from Expat

// DLL options compatibility check:
#include "wx/app.h"
WX_CHECK_BUILD_OPTIONS("wxXML")

//-----------------------------------------------------------------------------
//  wxXmlNode
//-----------------------------------------------------------------------------

wxXmlNode::wxXmlNode(wxXmlNode *parent,wxXmlNodeType type,
                     const wxString& name, const wxString& content,
                     wxXmlProperty *props, wxXmlNode *next)
    : m_type(type), m_name(name), m_content(content),
      m_properties(props), m_parent(parent),
      m_children(NULL), m_next(next)
{
    if (m_parent)
    {
        if (m_parent->m_children)
        {
            m_next = m_parent->m_children;
            m_parent->m_children = this;
        }
        else
            m_parent->m_children = this;
    }
}

wxXmlNode::wxXmlNode(wxXmlNodeType type, const wxString& name,
                     const wxString& content)
    : m_type(type), m_name(name), m_content(content),
      m_properties(NULL), m_parent(NULL),
      m_children(NULL), m_next(NULL)
{}

wxXmlNode::wxXmlNode(const wxXmlNode& node)
{
    m_next = NULL;
    m_parent = NULL;
    DoCopy(node);
}

wxXmlNode::~wxXmlNode()
{
    wxXmlNode *c, *c2;
    for (c = m_children; c; c = c2)
    {
        c2 = c->m_next;
        delete c;
    }

    wxXmlProperty *p, *p2;
    for (p = m_properties; p; p = p2)
    {
        p2 = p->GetNext();
        delete p;
    }
}

wxXmlNode& wxXmlNode::operator=(const wxXmlNode& node)
{
    wxDELETE(m_properties);
    wxDELETE(m_children);
    DoCopy(node);
    return *this;
}

void wxXmlNode::DoCopy(const wxXmlNode& node)
{
    m_type = node.m_type;
    m_name = node.m_name;
    m_content = node.m_content;
    m_children = NULL;

    wxXmlNode *n = node.m_children;
    while (n)
    {
        AddChild(new wxXmlNode(*n));
        n = n->GetNext();
    }

    m_properties = NULL;
    wxXmlProperty *p = node.m_properties;
    while (p)
    {
       AddProperty(p->GetName(), p->GetValue());
       p = p->GetNext();
    }
}

bool wxXmlNode::HasProp(const wxString& propName) const
{
    wxXmlProperty *prop = GetProperties();

    while (prop)
    {
        if (prop->GetName() == propName) return true;
        prop = prop->GetNext();
    }

    return false;
}

bool wxXmlNode::GetPropVal(const wxString& propName, wxString *value) const
{
    wxXmlProperty *prop = GetProperties();

    while (prop)
    {
        if (prop->GetName() == propName)
        {
            *value = prop->GetValue();
            return true;
        }
        prop = prop->GetNext();
    }

    return false;
}

wxString wxXmlNode::GetPropVal(const wxString& propName, const wxString& defaultVal) const
{
    wxString tmp;
    if (GetPropVal(propName, &tmp))
        return tmp;

    return defaultVal;
}

void wxXmlNode::AddChild(wxXmlNode *child)
{
    if (m_children == NULL)
        m_children = child;
    else
    {
        wxXmlNode *ch = m_children;
        while (ch->m_next) ch = ch->m_next;
        ch->m_next = child;
    }
    child->m_next = NULL;
    child->m_parent = this;
}

void wxXmlNode::InsertChild(wxXmlNode *child, wxXmlNode *before_node)
{
    wxASSERT_MSG(before_node->GetParent() == this, wxT("wxXmlNode::InsertChild - the node has incorrect parent"));

    if (m_children == before_node)
       m_children = child;
    else
    {
        wxXmlNode *ch = m_children;
        while (ch->m_next != before_node) ch = ch->m_next;
        ch->m_next = child;
    }

    child->m_parent = this;
    child->m_next = before_node;
}

bool wxXmlNode::RemoveChild(wxXmlNode *child)
{
    if (m_children == NULL)
        return false;
    else if (m_children == child)
    {
        m_children = child->m_next;
        child->m_parent = NULL;
        child->m_next = NULL;
        return true;
    }
    else
    {
        wxXmlNode *ch = m_children;
        while (ch->m_next)
        {
            if (ch->m_next == child)
            {
                ch->m_next = child->m_next;
                child->m_parent = NULL;
                child->m_next = NULL;
                return true;
            }
            ch = ch->m_next;
        }
        return false;
    }
}

void wxXmlNode::AddProperty(const wxString& name, const wxString& value)
{
    AddProperty(new wxXmlProperty(name, value, NULL));
}

void wxXmlNode::AddProperty(wxXmlProperty *prop)
{
    if (m_properties == NULL)
        m_properties = prop;
    else
    {
        wxXmlProperty *p = m_properties;
        while (p->GetNext()) p = p->GetNext();
        p->SetNext(prop);
    }
}

bool wxXmlNode::DeleteProperty(const wxString& name)
{
    wxXmlProperty *prop;

    if (m_properties == NULL)
        return false;

    else if (m_properties->GetName() == name)
    {
        prop = m_properties;
        m_properties = prop->GetNext();
        prop->SetNext(NULL);
        delete prop;
        return true;
    }

    else
    {
        wxXmlProperty *p = m_properties;
        while (p->GetNext())
        {
            if (p->GetNext()->GetName() == name)
            {
                prop = p->GetNext();
                p->SetNext(prop->GetNext());
                prop->SetNext(NULL);
                delete prop;
                return true;
            }
            p = p->GetNext();
        }
        return false;
    }
}



//-----------------------------------------------------------------------------
//  wxXmlDocument
//-----------------------------------------------------------------------------

wxXmlDocument::wxXmlDocument()
    : m_version(wxT("1.0")), m_fileEncoding(wxT("utf-8")), m_root(NULL)
{
#if !wxUSE_UNICODE
    m_encoding = wxT("UTF-8");
#endif
}

wxXmlDocument::wxXmlDocument(const wxString& filename, const wxString& encoding)
              :wxObject(), m_root(NULL)
{
    if ( !Load(filename, encoding) )
    {
        wxDELETE(m_root);
    }
}

wxXmlDocument::wxXmlDocument(wxInputStream& stream, const wxString& encoding)
              :wxObject(), m_root(NULL)
{
    if ( !Load(stream, encoding) )
    {
        wxDELETE(m_root);
    }
}

wxXmlDocument::wxXmlDocument(const wxXmlDocument& doc)
              :wxObject()
{
    DoCopy(doc);
}

wxXmlDocument& wxXmlDocument::operator=(const wxXmlDocument& doc)
{
    wxDELETE(m_root);
    DoCopy(doc);
    return *this;
}

void wxXmlDocument::DoCopy(const wxXmlDocument& doc)
{
    m_version = doc.m_version;
#if !wxUSE_UNICODE
    m_encoding = doc.m_encoding;
#endif
    m_fileEncoding = doc.m_fileEncoding;
    m_root = new wxXmlNode(*doc.m_root);
}

bool wxXmlDocument::Load(const wxString& filename, const wxString& encoding)
{
    wxFileInputStream stream(filename);
    return Load(stream, encoding);
}

bool wxXmlDocument::Save(const wxString& filename) const
{
    wxFileOutputStream stream(filename);
    return Save(stream);
}



//-----------------------------------------------------------------------------
//  wxXmlDocument loading routines
//-----------------------------------------------------------------------------

/*
    FIXME:
       - process all elements, including CDATA
 */

// converts Expat-produced string in UTF-8 into wxString.
inline static wxString CharToString(wxMBConv *conv,
                                    const char *s, size_t len = wxSTRING_MAXLEN)
{
#if wxUSE_UNICODE
    (void)conv;
    return wxString(s, wxConvUTF8, len);
#else
    if ( conv )
    {
        size_t nLen = (len != wxSTRING_MAXLEN) ? len :
                          wxConvUTF8.MB2WC((wchar_t*) NULL, s, 0);

        wchar_t *buf = new wchar_t[nLen+1];
        wxConvUTF8.MB2WC(buf, s, nLen);
        buf[nLen] = 0;
        wxString str(buf, *conv, len);
        delete[] buf;
        return str;
    }
    else
        return wxString(s, len != wxSTRING_MAXLEN ? len : strlen(s));
#endif
}

struct wxXmlParsingContext
{
    wxMBConv  *conv;
    wxXmlNode *root;
    wxXmlNode *node;
    wxXmlNode *lastAsText;
    wxString   encoding;
    wxString   version;