config.cpp

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///////////////////////////////////////////////////////////////////////////////
// Name:        config.cpp
// Purpose:     implementation of wxConfigBase class
// Author:      Vadim Zeitlin
// Modified by:
// Created:     07.04.98
// RCS-ID:      $Id: config.cpp,v 1.76.2.1 2006/01/20 00:58:03 VZ Exp $
// Copyright:   (c) 1997 Karsten Ball黡er   [e-mail]
//                       Vadim Zeitlin      <[e-mail]>
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
    #pragma implementation "confbase.h"
#endif

#include "wx/wxprec.h"

#ifdef    __BORLANDC__
  #pragma hdrstop
#endif  //__BORLANDC__

#ifndef wxUSE_CONFIG_NATIVE
    #define wxUSE_CONFIG_NATIVE 1
#endif

#include "wx/config.h"
#include "wx/intl.h"
#include "wx/log.h"
#include "wx/arrstr.h"

#if wxUSE_CONFIG && ((wxUSE_FILE && wxUSE_TEXTFILE) || wxUSE_CONFIG_NATIVE)

#include "wx/app.h"
#include "wx/file.h"
#include "wx/textfile.h"
#include "wx/utils.h"
#include "wx/utils.h"
#include "wx/math.h"

#include <stdlib.h>
#include <ctype.h>
#include <limits.h>     // for INT_MAX

// ----------------------------------------------------------------------------
// global and class static variables
// ----------------------------------------------------------------------------

wxConfigBase *wxConfigBase::ms_pConfig     = NULL;
bool          wxConfigBase::ms_bAutoCreate = true;

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// wxConfigBase
// ----------------------------------------------------------------------------

// Not all args will always be used by derived classes, but including them all
// in each class ensures compatibility.
wxConfigBase::wxConfigBase(const wxString& appName,
                           const wxString& vendorName,
                           const wxString& WXUNUSED(localFilename),
                           const wxString& WXUNUSED(globalFilename),
                           long style)
            : m_appName(appName), m_vendorName(vendorName), m_style(style)
{
    m_bExpandEnvVars = true;
    m_bRecordDefaults = false;
}

wxConfigBase::~wxConfigBase()
{
    // required here for Darwin
}

wxConfigBase *wxConfigBase::Set(wxConfigBase *pConfig)
{
  wxConfigBase *pOld = ms_pConfig;
  ms_pConfig = pConfig;
  return pOld;
}

wxConfigBase *wxConfigBase::Create()
{
  if ( ms_bAutoCreate && ms_pConfig == NULL ) {
    ms_pConfig =
    #if defined(__WXMSW__) && wxUSE_CONFIG_NATIVE
        new wxRegConfig(wxTheApp->GetAppName(), wxTheApp->GetVendorName());
    #elif defined(__WXPALMOS__) && wxUSE_CONFIG_NATIVE
        new wxPrefConfig(wxTheApp->GetAppName());
    #else // either we're under Unix or wish to use files even under Windows
      new wxFileConfig(wxTheApp->GetAppName());
    #endif
  }

  return ms_pConfig;
}

// ----------------------------------------------------------------------------
// wxConfigBase reading entries
// ----------------------------------------------------------------------------

// implement both Read() overloads for the given type in terms of DoRead()
#define IMPLEMENT_READ_FOR_TYPE(name, type, deftype, extra)                 \
    bool wxConfigBase::Read(const wxString& key, type *val) const           \
    {                                                                       \
        wxCHECK_MSG( val, false, _T("wxConfig::Read(): NULL parameter") );  \
                                                                            \
        if ( !DoRead##name(key, val) )                                      \
            return false;                                                   \
                                                                            \
        *val = extra(*val);                                                 \
                                                                            \
        return true;                                                        \
    }                                                                       \
                                                                            \
    bool wxConfigBase::Read(const wxString& key,                            \
                            type *val,                                      \
                            deftype defVal) const                           \
    {                                                                       \
        wxCHECK_MSG( val, false, _T("wxConfig::Read(): NULL parameter") );  \
                                                                            \
        bool read = DoRead##name(key, val);                                 \
        if ( !read )                                                        \
        {                                                                   \
            if ( IsRecordingDefaults() )                                    \
            {                                                               \
                ((wxConfigBase *)this)->DoWrite##name(key, defVal);         \
            }                                                               \
                                                                            \
            *val = defVal;                                                  \
        }                                                                   \
                                                                            \
        *val = extra(*val);                                                 \
                                                                            \
        return read;                                                        \
    }


IMPLEMENT_READ_FOR_TYPE(String, wxString, const wxString&, ExpandEnvVars)
IMPLEMENT_READ_FOR_TYPE(Long, long, long, long)
IMPLEMENT_READ_FOR_TYPE(Int, int, int, int)
IMPLEMENT_READ_FOR_TYPE(Double, double, double, double)
IMPLEMENT_READ_FOR_TYPE(Bool, bool, bool, bool)

#undef IMPLEMENT_READ_FOR_TYPE

// the DoReadXXX() for the other types have implementation in the base class
// but can be overridden in the derived ones
bool wxConfigBase::DoReadInt(const wxString& key, int *pi) const
{
    wxCHECK_MSG( pi, false, _T("wxConfig::Read(): NULL parameter") );

    long l;
    if ( !DoReadLong(key, &l) )
        return false;

    wxASSERT_MSG( l < INT_MAX, _T("overflow in wxConfig::DoReadInt") );

    *pi = (int)l;

    return true;
}

bool wxConfigBase::DoReadBool(const wxString& key, bool* val) const
{
    wxCHECK_MSG( val, false, _T("wxConfig::Read(): NULL parameter") );

    long l;
    if ( !DoReadLong(key, &l) )
        return false;

    wxASSERT_MSG( l == 0 || l == 1, _T("bad bool value in wxConfig::DoReadInt") );

    *val = l != 0;

    return true;
}

bool wxConfigBase::DoReadDouble(const wxString& key, double* val) const
{
    wxString str;
    if ( Read(key, &str) )
    {
        return str.ToDouble(val);
    }

    return false;
}

// string reading helper
wxString wxConfigBase::ExpandEnvVars(const wxString& str) const
{
    wxString tmp; // Required for BC++
    if (IsExpandingEnvVars())
        tmp = wxExpandEnvVars(str);
    else
        tmp = str;
    return tmp;
}

// ----------------------------------------------------------------------------
// wxConfigBase writing
// ----------------------------------------------------------------------------

bool wxConfigBase::DoWriteDouble(const wxString& key, double val)
{
    return DoWriteString(key, wxString::Format(_T("%g"), val));
}

bool wxConfigBase::DoWriteInt(const wxString& key, int value)
{
    return DoWriteLong(key, (long)value);
}

bool wxConfigBase::DoWriteBool(const wxString& key, bool value)
{
    return DoWriteLong(key, value ? 1l : 0l);
}

// ----------------------------------------------------------------------------
// wxConfigPathChanger
// ----------------------------------------------------------------------------