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 #if wxUSE_CONFIG && ((wxUSE_FILE && wxUSE_TEXTFILE) || wxUSE_CONFIG_NATIVE)
  31
  32 #include "wx/app.h"
  33 #include "wx/file.h"
  34 #include "wx/log.h"
  35 #include "wx/textfile.h"
  36 #include "wx/utils.h"
  37 #include "wx/log.h"
  38 #include "wx/utils.h"
  39 #include "wx/intl.h"
  40
  41 #include "wx/config.h"
  42
  43 #include <stdlib.h>
  44 #include <math.h>
  45 #include <ctype.h>
  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; m_bRecordDefaults = FALSE;
  72 }
  73
  74 wxConfigBase::~wxConfigBase()
  75 {
  76 }
  77
  78 wxConfigBase *wxConfigBase::Set(wxConfigBase *pConfig)
  79 {
  80   wxConfigBase *pOld = ms_pConfig;
  81   ms_pConfig = pConfig;
  82   return pOld;
  83 }
  84
  85 wxConfigBase *wxConfigBase::Create()
  86 {
  87   if ( ms_bAutoCreate && ms_pConfig == NULL ) {
  88     ms_pConfig =
  89     #if defined(__WXMSW__) && wxUSE_CONFIG_NATIVE
  90       #ifdef __WIN32__
  91         new wxRegConfig(wxTheApp->GetAppName(), wxTheApp->GetVendorName());
  92       #else  //WIN16
  93         new wxIniConfig(wxTheApp->GetAppName(), wxTheApp->GetVendorName());
  94       #endif
  95     #else // either we're under Unix or wish to use files even under Windows
  96       new wxFileConfig(wxTheApp->GetAppName());
  97     #endif
  98   }
  99
 100   return ms_pConfig;
 101 }
 102
 103 wxString wxConfigBase::Read(const wxString& key, const wxString& defVal) const
 104 {
 105   wxString s;
 106   Read(key, &s, defVal);
 107   return s;
 108 }
 109
 110 bool wxConfigBase::Read(const wxString& key, wxString *str, const wxString& defVal) const
 111 {
 112     if (!Read(key, str))
 113     {
 114         *str = ExpandEnvVars(defVal);
 115         return FALSE;
 116     }
 117     else
 118         return TRUE;
 119 }
 120
 121 bool wxConfigBase::Read(const wxString& key, long *pl, long defVal) const
 122 {
 123     if (!Read(key, pl))
 124     {
 125         *pl = defVal;
 126         return FALSE;
 127     }
 128     else
 129         return TRUE;
 130 }
 131
 132 bool wxConfigBase::Read(const wxString& key, double* val) const
 133 {
 134     wxString str;
 135     if (Read(key, & str))
 136     {
 137         return wxSscanf(str, _T("%g"), val) == 1;
 138     }
 139
 140     return FALSE;
 141 }
 142
 143 bool wxConfigBase::Read(const wxString& key, double* val, double defVal) const
 144 {
 145     if (!Read(key, val))
 146     {
 147         *val = defVal;
 148         return FALSE;
 149     }
 150     else
 151         return TRUE;
 152 }
 153
 154 bool wxConfigBase::Read(const wxString& key, bool* val) const
 155 {
 156     long l;
 157     if (Read(key, & l))
 158     {
 159         *val = (l != 0);
 160         return TRUE;
 161     }
 162     else
 163         return FALSE;
 164 }
 165
 166 bool wxConfigBase::Read(const wxString& key, bool* val, bool defVal) const
 167 {
 168     if (!Read(key, val))
 169     {
 170         *val = defVal;
 171         return FALSE;
 172     }
 173     else
 174         return TRUE;
 175 }
 176
 177 // Convenience functions
 178
 179 bool wxConfigBase::Read(const wxString& key, int *pi) const
 180 {
 181     long l;
 182     bool ret = Read(key, &l);
 183     if (ret)
 184         *pi = (int) l;
 185     return ret;
 186 }
 187
 188 bool wxConfigBase::Read(const wxString& key, int *pi, int defVal) const
 189 {
 190     long l;
 191     bool ret = Read(key, &l, (long) defVal);
 192     if (ret)
 193         *pi = (int) l;
 194     return ret;
 195 }
 196
 197 bool wxConfigBase::Write(const wxString& key, double val)
 198 {
 199     wxString str;
 200     str.Printf(wxT("%g"), val);
 201     return Write(key, str);
 202 }
 203
 204 bool wxConfigBase::Write(const wxString& key, bool value)
 205 {
 206     long l = (value ? 1 : 0);
 207     return Write(key, l);
 208 }
 209
 210 bool wxConfigBase::Write( const wxString &key, const wxChar *text )
 211 {
 212     return Write(key, str) ;
 213 }
 214 wxString wxConfigBase::ExpandEnvVars(const wxString& str) const
 215 {
 216     wxString tmp; // Required for BC++
 217     if (IsExpandingEnvVars())
 218         tmp = wxExpandEnvVars(str);
 219     else
 220         tmp = str;
 221     return tmp;
 222 }
 223
 224 // ----------------------------------------------------------------------------
 225 // wxConfigPathChanger
 226 // ----------------------------------------------------------------------------
 227
 228 wxConfigPathChanger::wxConfigPathChanger(const wxConfigBase *pContainer,
 229                                  const wxString& strEntry)
 230 {
 231   m_pContainer = (wxConfigBase *)pContainer;
 232
 233   // the path is everything which precedes the last slash
 234   wxString strPath = strEntry.BeforeLast(wxCONFIG_PATH_SEPARATOR);
 235
 236   // except in the special case of "/keyname" when there is nothing before "/"
 237   if ( strPath.IsEmpty() &&
 238        ((!strEntry.IsEmpty()) && strEntry[0] == wxCONFIG_PATH_SEPARATOR) )
 239   {
 240     strPath = wxCONFIG_PATH_SEPARATOR;
 241   }
 242
 243   if ( !strPath.IsEmpty() ) {
 244     // do change the path
 245     m_bChanged = TRUE;
 246     m_strName = strEntry.AfterLast(wxCONFIG_PATH_SEPARATOR);
 247     m_strOldPath = m_pContainer->GetPath();
 248     if ( m_strOldPath.Len() == 0 ||
 249          m_strOldPath.Last() != wxCONFIG_PATH_SEPARATOR )
 250         m_strOldPath += wxCONFIG_PATH_SEPARATOR;
 251     m_pContainer->SetPath(strPath);
 252   }
 253   else {
 254     // it's a name only, without path - nothing to do
 255     m_bChanged = FALSE;
 256     m_strName = strEntry;
 257   }
 258 }
 259
 260 wxConfigPathChanger::~wxConfigPathChanger()
 261 {
 262   // only restore path if it was changed
 263   if ( m_bChanged ) {
 264     m_pContainer->SetPath(m_strOldPath);
 265   }
 266 }
 267
 268 // ----------------------------------------------------------------------------
 269 // static & global functions
 270 // ----------------------------------------------------------------------------
 271
 272 // understands both Unix and Windows (but only under Windows) environment
 273 // variables expansion: i.e. $var, $(var) and ${var} are always understood
 274 // and in addition under Windows %var% is also.
 275 wxString wxExpandEnvVars(const wxString& str)
 276 {
 277   wxString strResult;
 278   strResult.Alloc(str.Len());
 279
 280   // don't change the values the enum elements: they must be equal
 281   // to the matching [closing] delimiter.
 282   enum Bracket
 283   {
 284     Bracket_None,
 285     Bracket_Normal  = ')',
 286     Bracket_Curly   = '}'
 287 #ifdef  __WXMSW__
 288     ,Bracket_Windows = '%'     // yeah, Windows people are a bit strange ;-)
 289 #endif
 290   };
 291
 292   size_t m;
 293   for ( size_t n = 0; n < str.Len(); n++ ) {
 294     switch ( str[n] ) {
 295 #ifdef  __WXMSW__
 296       case wxT('%'):
 297 #endif  //WINDOWS
 298       case wxT('$'):
 299         {
 300           Bracket bracket;
 301           #ifdef  __WXMSW__
 302             if ( str[n] == wxT('%') )
 303               bracket = Bracket_Windows;
 304             else
 305           #endif  //WINDOWS
 306           if ( n == str.Len() - 1 ) {
 307             bracket = Bracket_None;
 308           }
 309           else {
 310             switch ( str[n + 1] ) {
 311               case wxT('('):
 312                 bracket = Bracket_Normal;
 313                 n++;                   // skip the bracket
 314                 break;
 315
 316               case wxT('{'):
 317                 bracket = Bracket_Curly;
 318                 n++;                   // skip the bracket
 319                 break;
 320
 321               default:
 322                 bracket = Bracket_None;
 323             }
 324           }
 325
 326           m = n + 1;
 327
 328           while ( m < str.Len() && (wxIsalnum(str[m]) || str[m] == wxT('_')) )
 329             m++;
 330
 331           wxString strVarName(str.c_str() + n + 1, m - n - 1);
 332
 333           const wxChar *pszValue = wxGetenv(strVarName);
 334           if ( pszValue != NULL ) {
 335             strResult += pszValue;
 336           }
 337           else {
 338             // variable doesn't exist => don't change anything
 339             #ifdef  __WXMSW__
 340               if ( bracket != Bracket_Windows )
 341             #endif
 342                 if ( bracket != Bracket_None )
 343                   strResult << str[n - 1];
 344             strResult << str[n] << strVarName;
 345           }
 346
 347           // check the closing bracket
 348           if ( bracket != Bracket_None ) {
 349             if ( m == str.Len() || str[m] != (char)bracket ) {
 350               wxLogWarning(_("Environment variables expansion failed: missing '%c' at position %d in '%s'."),
 351                            (char)bracket, m + 1, str.c_str());
 352             }
 353             else {
 354               // skip closing bracket unless the variables wasn't expanded
 355               if ( pszValue == NULL )
 356                 strResult << (char)bracket;
 357               m++;
 358             }
 359           }
 360
 361           n = m - 1;  // skip variable name
 362         }
 363         break;
 364
 365       case '\\':
 366         // backslash can be used to suppress special meaning of % and $
 367         if ( n != str.Len() && (str[n + 1] == wxT('%') || str[n + 1] == wxT('$')) ) {
 368           strResult += str[++n];
 369
 370           break;
 371         }
 372         //else: fall through
 373
 374       default:
 375         strResult += str[n];
 376     }
 377   }
 378
 379   return strResult;
 380 }
 381
 382 // this function is used to properly interpret '..' in path
 383 void wxSplitPath(wxArrayString& aParts, const wxChar *sz)
 384 {
 385   aParts.Empty();
 386
 387   wxString strCurrent;
 388   const wxChar *pc = sz;
 389   for ( ;; ) {
 390     if ( *pc == wxT('\0') || *pc == wxCONFIG_PATH_SEPARATOR ) {
 391       if ( strCurrent == wxT(".") ) {
 392         // ignore
 393       }
 394       else if ( strCurrent == wxT("..") ) {
 395         // go up one level
 396         if ( aParts.IsEmpty() )
 397           wxLogWarning(_("'%s' has extra '..', ignored."), sz);
 398         else
 399           aParts.Remove(aParts.Count() - 1);
 400
 401         strCurrent.Empty();
 402       }
 403       else if ( !strCurrent.IsEmpty() ) {
 404         aParts.Add(strCurrent);
 405         strCurrent.Empty();
 406       }
 407       //else:
 408         // could log an error here, but we prefer to ignore extra '/'
 409
 410       if ( *pc == wxT('\0') )
 411         break;
 412     }
 413     else
 414       strCurrent += *pc;
 415
 416     pc++;
 417   }
 418 }
 419
 420 #endif // wxUSE_CONFIG
 421