src/common/config.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        config.cpp
   3 // Purpose:     implementation of wxConfigBase class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     07.04.98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1997 Karsten Ballüder   Ballueder@usa.net
   9 //                       Vadim Zeitlin      <zeitlin@dptmaths.ens-cachan.fr>
  10 // Licence:     wxWindows license
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 // ----------------------------------------------------------------------------
  14 // headers
  15 // ----------------------------------------------------------------------------
  16 #ifdef __GNUG__
  17     #pragma implementation "confbase.h"
  18 #endif
  19
  20 #include "wx/wxprec.h"
  21
  22 #ifdef    __BORLANDC__
  23   #pragma hdrstop
  24 #endif  //__BORLANDC__
  25
  26 #ifndef wxUSE_CONFIG_NATIVE
  27     #define wxUSE_CONFIG_NATIVE 1
  28 #endif
  29
  30 #include "wx/config.h"
  31 #include "wx/intl.h"
  32 #include "wx/log.h"
  33
  34 #if wxUSE_CONFIG && ((wxUSE_FILE && wxUSE_TEXTFILE) || wxUSE_CONFIG_NATIVE)
  35
  36 #include "wx/app.h"
  37 #include "wx/file.h"
  38 #include "wx/textfile.h"
  39 #include "wx/utils.h"
  40 #include "wx/utils.h"
  41
  42 #include <stdlib.h>
  43 #include <math.h>
  44 #include <ctype.h>
  45 #include <limits.h>     // for INT_MAX
  46
  47 // ----------------------------------------------------------------------------
  48 // global and class static variables
  49 // ----------------------------------------------------------------------------
  50
  51 wxConfigBase *wxConfigBase::ms_pConfig     = NULL;
  52 bool          wxConfigBase::ms_bAutoCreate = TRUE;
  53
  54 // ============================================================================
  55 // implementation
  56 // ============================================================================
  57
  58 // ----------------------------------------------------------------------------
  59 // wxConfigBase
  60 // ----------------------------------------------------------------------------
  61
  62 // Not all args will always be used by derived classes, but including them all
  63 // in each class ensures compatibility.
  64 wxConfigBase::wxConfigBase(const wxString& appName,
  65                            const wxString& vendorName,
  66                            const wxString& WXUNUSED(localFilename),
  67                            const wxString& WXUNUSED(globalFilename),
  68                            long style)
  69             : m_appName(appName), m_vendorName(vendorName), m_style(style)
  70 {
  71     m_bExpandEnvVars = TRUE;
  72     m_bRecordDefaults = FALSE;
  73 }
  74
  75 wxConfigBase::~wxConfigBase()
  76 {
  77 }
  78
  79 wxConfigBase *wxConfigBase::Set(wxConfigBase *pConfig)
  80 {
  81   wxConfigBase *pOld = ms_pConfig;
  82   ms_pConfig = pConfig;
  83   return pOld;
  84 }
  85
  86 wxConfigBase *wxConfigBase::Create()
  87 {
  88   if ( ms_bAutoCreate && ms_pConfig == NULL ) {
  89     ms_pConfig =
  90     #if defined(__WXMSW__) && wxUSE_CONFIG_NATIVE
  91       #ifdef __WIN32__
  92         new wxRegConfig(wxTheApp->GetAppName(), wxTheApp->GetVendorName());
  93       #else  //WIN16
  94         new wxIniConfig(wxTheApp->GetAppName(), wxTheApp->GetVendorName());
  95       #endif
  96     #else // either we're under Unix or wish to use files even under Windows
  97       new wxFileConfig(wxTheApp->GetAppName());
  98     #endif
  99   }
 100
 101   return ms_pConfig;
 102 }
 103
 104 // ----------------------------------------------------------------------------
 105 // wxConfigBase reading entries
 106 // ----------------------------------------------------------------------------
 107
 108 // implement both Read() overloads for the given type in terms of DoRead()
 109 #define IMPLEMENT_READ_FOR_TYPE(name, type, deftype, extra)                 \
 110     bool wxConfigBase::Read(const wxString& key, type *val) const           \
 111     {                                                                       \
 112         wxCHECK_MSG( val, FALSE, _T("wxConfig::Read(): NULL parameter") );  \
 113                                                                             \
 114         if ( !DoRead##name(key, val) )                                      \
 115             return FALSE;                                                   \
 116                                                                             \
 117         *val = extra(*val);                                                 \
 118                                                                             \
 119         return TRUE;                                                        \
 120     }                                                                       \
 121                                                                             \
 122     bool wxConfigBase::Read(const wxString& key,                            \
 123                             type *val,                                      \
 124                             deftype defVal) const                           \
 125     {                                                                       \
 126         wxCHECK_MSG( val, FALSE, _T("wxConfig::Read(): NULL parameter") );  \
 127                                                                             \
 128         bool read = DoRead##name(key, val);                                 \
 129         if ( !read )                                                        \
 130         {                                                                   \
 131             if ( IsRecordingDefaults() )                                    \
 132             {                                                               \
 133                 ((wxConfigBase *)this)->DoWrite##name(key, defVal);         \
 134             }                                                               \
 135                                                                             \
 136             *val = defVal;                                                  \
 137         }                                                                   \
 138                                                                             \
 139         *val = extra(*val);                                                 \
 140                                                                             \
 141         return read;                                                        \
 142     }
 143
 144
 145 IMPLEMENT_READ_FOR_TYPE(String, wxString, const wxString&, ExpandEnvVars)
 146 IMPLEMENT_READ_FOR_TYPE(Long, long, long, long)
 147 IMPLEMENT_READ_FOR_TYPE(Int, int, int, int)
 148 IMPLEMENT_READ_FOR_TYPE(Double, double, double, double)
 149 IMPLEMENT_READ_FOR_TYPE(Bool, bool, bool, bool)
 150
 151 #undef IMPLEMENT_READ_FOR_TYPE
 152
 153 // the DoReadXXX() for the other types have implementation in the base class
 154 // but can be overridden in the derived ones
 155 bool wxConfigBase::DoReadInt(const wxString& key, int *pi) const
 156 {
 157     wxCHECK_MSG( pi, FALSE, _T("wxConfig::Read(): NULL parameter") );
 158
 159     long l;
 160     if ( !DoReadLong(key, &l) )
 161         return FALSE;
 162
 163     wxASSERT_MSG( l < INT_MAX, _T("overflow in wxConfig::DoReadInt") );
 164
 165     *pi = (int)l;
 166
 167     return TRUE;
 168 }
 169
 170 bool wxConfigBase::DoReadBool(const wxString& key, bool* val) const
 171 {
 172     wxCHECK_MSG( val, FALSE, _T("wxConfig::Read(): NULL parameter") );
 173
 174     long l;
 175     if ( !DoReadLong(key, &l) )
 176         return FALSE;
 177
 178     wxASSERT_MSG( l == 0 || l == 1, _T("bad bool value in wxConfig::DoReadInt") );
 179
 180     *val = l != 0;
 181
 182     return TRUE;
 183 }
 184
 185 bool wxConfigBase::DoReadDouble(const wxString& key, double* val) const
 186 {
 187     wxString str;
 188     if ( Read(key, &str) )
 189     {
 190         return str.ToDouble(val);
 191     }
 192
 193     return FALSE;
 194 }
 195
 196 // string reading helper
 197 wxString wxConfigBase::ExpandEnvVars(const wxString& str) const
 198 {
 199     wxString tmp; // Required for BC++
 200     if (IsExpandingEnvVars())
 201         tmp = wxExpandEnvVars(str);
 202     else
 203         tmp = str;
 204     return tmp;
 205 }
 206
 207 // ----------------------------------------------------------------------------
 208 // wxConfigBase writing
 209 // ----------------------------------------------------------------------------
 210
 211 bool wxConfigBase::DoWriteDouble(const wxString& key, double val)
 212 {
 213     return DoWriteString(key, wxString::Format(_T("%g"), val));
 214 }
 215
 216 bool wxConfigBase::DoWriteInt(const wxString& key, int value)
 217 {
 218     return DoWriteLong(key, (long)value);
 219 }
 220
 221 bool wxConfigBase::DoWriteBool(const wxString& key, bool value)
 222 {
 223     return DoWriteLong(key, value ? 1l : 0l);
 224 }
 225
 226 // ----------------------------------------------------------------------------
 227 // wxConfigPathChanger
 228 // ----------------------------------------------------------------------------
 229
 230 wxConfigPathChanger::wxConfigPathChanger(const wxConfigBase *pContainer,
 231                                  const wxString& strEntry)
 232 {
 233   m_pContainer = (wxConfigBase *)pContainer;
 234
 235   // the path is everything which precedes the last slash
 236   wxString strPath = strEntry.BeforeLast(wxCONFIG_PATH_SEPARATOR);
 237
 238   // except in the special case of "/keyname" when there is nothing before "/"
 239   if ( strPath.IsEmpty() &&
 240        ((!strEntry.IsEmpty()) && strEntry[0] == wxCONFIG_PATH_SEPARATOR) )
 241   {
 242     strPath = wxCONFIG_PATH_SEPARATOR;
 243   }
 244
 245   if ( !strPath.IsEmpty() ) {
 246     // do change the path
 247     m_bChanged = TRUE;
 248     m_strName = strEntry.AfterLast(wxCONFIG_PATH_SEPARATOR);
 249     m_strOldPath = m_pContainer->GetPath();
 250     if ( m_strOldPath.Len() == 0 ||
 251          m_strOldPath.Last() != wxCONFIG_PATH_SEPARATOR )
 252         m_strOldPath += wxCONFIG_PATH_SEPARATOR;
 253     m_pContainer->SetPath(strPath);
 254   }
 255   else {
 256     // it's a name only, without path - nothing to do
 257     m_bChanged = FALSE;
 258     m_strName = strEntry;
 259   }
 260 }
 261
 262 wxConfigPathChanger::~wxConfigPathChanger()
 263 {
 264   // only restore path if it was changed
 265   if ( m_bChanged ) {
 266     m_pContainer->SetPath(m_strOldPath);
 267   }
 268 }
 269
 270 #endif // wxUSE_CONFIG
 271
 272 // ----------------------------------------------------------------------------
 273 // static & global functions
 274 // ----------------------------------------------------------------------------
 275
 276 // understands both Unix and Windows (but only under Windows) environment
 277 // variables expansion: i.e. $var, $(var) and ${var} are always understood
 278 // and in addition under Windows %var% is also.
 279 wxString wxExpandEnvVars(const wxString& str)
 280 {
 281   wxString strResult;
 282   strResult.Alloc(str.Len());
 283
 284   // don't change the values the enum elements: they must be equal
 285   // to the matching [closing] delimiter.
 286   enum Bracket
 287   {
 288     Bracket_None,
 289     Bracket_Normal  = ')',
 290     Bracket_Curly   = '}',
 291 #ifdef  __WXMSW__
 292     Bracket_Windows = '%',    // yeah, Windows people are a bit strange ;-)
 293 #endif
 294     Bracket_Max
 295   };
 296
 297   size_t m;
 298   for ( size_t n = 0; n < str.Len(); n++ ) {
 299     switch ( str[n] ) {
 300 #ifdef  __WXMSW__
 301       case wxT('%'):
 302 #endif  //WINDOWS
 303       case wxT('$'):
 304         {
 305           Bracket bracket;
 306           #ifdef  __WXMSW__
 307             if ( str[n] == wxT('%') )
 308               bracket = Bracket_Windows;
 309             else
 310           #endif  //WINDOWS
 311           if ( n == str.Len() - 1 ) {
 312             bracket = Bracket_None;
 313           }
 314           else {
 315             switch ( str[n + 1] ) {
 316               case wxT('('):
 317                 bracket = Bracket_Normal;
 318                 n++;                   // skip the bracket
 319                 break;
 320
 321               case wxT('{'):
 322                 bracket = Bracket_Curly;
 323                 n++;                   // skip the bracket
 324                 break;
 325
 326               default:
 327                 bracket = Bracket_None;
 328             }
 329           }
 330
 331           m = n + 1;
 332
 333           while ( m < str.Len() && (wxIsalnum(str[m]) || str[m] == wxT('_')) )
 334             m++;
 335
 336           wxString strVarName(str.c_str() + n + 1, m - n - 1);
 337
 338           const wxChar *pszValue = wxGetenv(strVarName);
 339           if ( pszValue != NULL ) {
 340             strResult += pszValue;
 341           }
 342           else {
 343             // variable doesn't exist => don't change anything
 344             #ifdef  __WXMSW__
 345               if ( bracket != Bracket_Windows )
 346             #endif
 347                 if ( bracket != Bracket_None )
 348                   strResult << str[n - 1];
 349             strResult << str[n] << strVarName;
 350           }
 351
 352           // check the closing bracket
 353           if ( bracket != Bracket_None ) {
 354             if ( m == str.Len() || str[m] != (char)bracket ) {
 355               // under MSW it's common to have '%' characters in the registry
 356               // and it's annoying to have warnings about them each time, so
 357               // ignroe them silently if they are not used for env vars
 358               //
 359               // under Unix, OTOH, this warning could be useful for the user to
 360               // understand why isn't the variable expanded as intended
 361               #ifndef __WXMSW__
 362                 wxLogWarning(_("Environment variables expansion failed: missing '%c' at position %d in '%s'."),
 363                              (char)bracket, m + 1, str.c_str());
 364               #endif // __WXMSW__
 365             }
 366             else {
 367               // skip closing bracket unless the variables wasn't expanded
 368               if ( pszValue == NULL )
 369                 strResult << (char)bracket;
 370               m++;
 371             }
 372           }
 373
 374           n = m - 1;  // skip variable name
 375         }
 376         break;
 377
 378       case '\\':
 379         // backslash can be used to suppress special meaning of % and $
 380         if ( n != str.Len() && (str[n + 1] == wxT('%') || str[n + 1] == wxT('$')) ) {
 381           strResult += str[++n];
 382
 383           break;
 384         }
 385         //else: fall through
 386
 387       default:
 388         strResult += str[n];
 389     }
 390   }
 391
 392   return strResult;
 393 }
 394
 395 // this function is used to properly interpret '..' in path
 396 void wxSplitPath(wxArrayString& aParts, const wxChar *sz)
 397 {
 398   aParts.Empty();
 399
 400   wxString strCurrent;
 401   const wxChar *pc = sz;
 402   for ( ;; ) {
 403     if ( *pc == wxT('\0') || *pc == wxCONFIG_PATH_SEPARATOR ) {
 404       if ( strCurrent == wxT(".") ) {
 405         // ignore
 406       }
 407       else if ( strCurrent == wxT("..") ) {
 408         // go up one level
 409         if ( aParts.IsEmpty() )
 410           wxLogWarning(_("'%s' has extra '..', ignored."), sz);
 411         else
 412           aParts.Remove(aParts.Count() - 1);
 413
 414         strCurrent.Empty();
 415       }
 416       else if ( !strCurrent.IsEmpty() ) {
 417         aParts.Add(strCurrent);
 418         strCurrent.Empty();
 419       }
 420       //else:
 421         // could log an error here, but we prefer to ignore extra '/'
 422
 423       if ( *pc == wxT('\0') )
 424         break;
 425     }
 426     else
 427       strCurrent += *pc;
 428
 429     pc++;
 430   }
 431 }
 432
 433