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 str.ToDouble(val);
 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     return Write(key, value ? 1l : 0l);
 207 }
 208
 209 bool wxConfigBase::Write(const wxString& key, const wxChar *value)
 210 {
 211     // explicit cast needed, otherwise value would have been converted to bool
 212     return Write(key, wxString(value));
 213 }
 214
 215 wxString wxConfigBase::ExpandEnvVars(const wxString& str) const
 216 {
 217     wxString tmp; // Required for BC++
 218     if (IsExpandingEnvVars())
 219         tmp = wxExpandEnvVars(str);
 220     else
 221         tmp = str;
 222     return tmp;
 223 }
 224
 225 // ----------------------------------------------------------------------------
 226 // wxConfigPathChanger
 227 // ----------------------------------------------------------------------------
 228
 229 wxConfigPathChanger::wxConfigPathChanger(const wxConfigBase *pContainer,
 230                                  const wxString& strEntry)
 231 {
 232   m_pContainer = (wxConfigBase *)pContainer;
 233
 234   // the path is everything which precedes the last slash
 235   wxString strPath = strEntry.BeforeLast(wxCONFIG_PATH_SEPARATOR);
 236
 237   // except in the special case of "/keyname" when there is nothing before "/"
 238   if ( strPath.IsEmpty() &&
 239        ((!strEntry.IsEmpty()) && strEntry[0] == wxCONFIG_PATH_SEPARATOR) )
 240   {
 241     strPath = wxCONFIG_PATH_SEPARATOR;
 242   }
 243
 244   if ( !strPath.IsEmpty() ) {
 245     // do change the path
 246     m_bChanged = TRUE;
 247     m_strName = strEntry.AfterLast(wxCONFIG_PATH_SEPARATOR);
 248     m_strOldPath = m_pContainer->GetPath();
 249     if ( m_strOldPath.Len() == 0 ||
 250          m_strOldPath.Last() != wxCONFIG_PATH_SEPARATOR )
 251         m_strOldPath += wxCONFIG_PATH_SEPARATOR;
 252     m_pContainer->SetPath(strPath);
 253   }
 254   else {
 255     // it's a name only, without path - nothing to do
 256     m_bChanged = FALSE;
 257     m_strName = strEntry;
 258   }
 259 }
 260
 261 wxConfigPathChanger::~wxConfigPathChanger()
 262 {
 263   // only restore path if it was changed
 264   if ( m_bChanged ) {
 265     m_pContainer->SetPath(m_strOldPath);
 266   }
 267 }
 268
 269 // ----------------------------------------------------------------------------
 270 // static & global functions
 271 // ----------------------------------------------------------------------------
 272
 273 // understands both Unix and Windows (but only under Windows) environment
 274 // variables expansion: i.e. $var, $(var) and ${var} are always understood
 275 // and in addition under Windows %var% is also.
 276 wxString wxExpandEnvVars(const wxString& str)
 277 {
 278   wxString strResult;
 279   strResult.Alloc(str.Len());
 280
 281   // don't change the values the enum elements: they must be equal
 282   // to the matching [closing] delimiter.
 283   enum Bracket
 284   {
 285     Bracket_None,
 286     Bracket_Normal  = ')',
 287     Bracket_Curly   = '}'
 288 #ifdef  __WXMSW__
 289     ,Bracket_Windows = '%'     // yeah, Windows people are a bit strange ;-)
 290 #endif
 291   };
 292
 293   size_t m;
 294   for ( size_t n = 0; n < str.Len(); n++ ) {
 295     switch ( str[n] ) {
 296 #ifdef  __WXMSW__
 297       case wxT('%'):
 298 #endif  //WINDOWS
 299       case wxT('$'):
 300         {
 301           Bracket bracket;
 302           #ifdef  __WXMSW__
 303             if ( str[n] == wxT('%') )
 304               bracket = Bracket_Windows;
 305             else
 306           #endif  //WINDOWS
 307           if ( n == str.Len() - 1 ) {
 308             bracket = Bracket_None;
 309           }
 310           else {
 311             switch ( str[n + 1] ) {
 312               case wxT('('):
 313                 bracket = Bracket_Normal;
 314                 n++;                   // skip the bracket
 315                 break;
 316
 317               case wxT('{'):
 318                 bracket = Bracket_Curly;
 319                 n++;                   // skip the bracket
 320                 break;
 321
 322               default:
 323                 bracket = Bracket_None;
 324             }
 325           }
 326
 327           m = n + 1;
 328
 329           while ( m < str.Len() && (wxIsalnum(str[m]) || str[m] == wxT('_')) )
 330             m++;
 331
 332           wxString strVarName(str.c_str() + n + 1, m - n - 1);
 333
 334           const wxChar *pszValue = wxGetenv(strVarName);
 335           if ( pszValue != NULL ) {
 336             strResult += pszValue;
 337           }
 338           else {
 339             // variable doesn't exist => don't change anything
 340             #ifdef  __WXMSW__
 341               if ( bracket != Bracket_Windows )
 342             #endif
 343                 if ( bracket != Bracket_None )
 344                   strResult << str[n - 1];
 345             strResult << str[n] << strVarName;
 346           }
 347
 348           // check the closing bracket
 349           if ( bracket != Bracket_None ) {
 350             if ( m == str.Len() || str[m] != (char)bracket ) {
 351               wxLogWarning(_("Environment variables expansion failed: missing '%c' at position %d in '%s'."),
 352                            (char)bracket, m + 1, str.c_str());
 353             }
 354             else {
 355               // skip closing bracket unless the variables wasn't expanded
 356               if ( pszValue == NULL )
 357                 strResult << (char)bracket;
 358               m++;
 359             }
 360           }
 361
 362           n = m - 1;  // skip variable name
 363         }
 364         break;
 365
 366       case '\\':
 367         // backslash can be used to suppress special meaning of % and $
 368         if ( n != str.Len() && (str[n + 1] == wxT('%') || str[n + 1] == wxT('$')) ) {
 369           strResult += str[++n];
 370
 371           break;
 372         }
 373         //else: fall through
 374
 375       default:
 376         strResult += str[n];
 377     }
 378   }
 379
 380   return strResult;
 381 }
 382
 383 // this function is used to properly interpret '..' in path
 384 void wxSplitPath(wxArrayString& aParts, const wxChar *sz)
 385 {
 386   aParts.Empty();
 387
 388   wxString strCurrent;
 389   const wxChar *pc = sz;
 390   for ( ;; ) {
 391     if ( *pc == wxT('\0') || *pc == wxCONFIG_PATH_SEPARATOR ) {
 392       if ( strCurrent == wxT(".") ) {
 393         // ignore
 394       }
 395       else if ( strCurrent == wxT("..") ) {
 396         // go up one level
 397         if ( aParts.IsEmpty() )
 398           wxLogWarning(_("'%s' has extra '..', ignored."), sz);
 399         else
 400           aParts.Remove(aParts.Count() - 1);
 401
 402         strCurrent.Empty();
 403       }
 404       else if ( !strCurrent.IsEmpty() ) {
 405         aParts.Add(strCurrent);
 406         strCurrent.Empty();
 407       }
 408       //else:
 409         // could log an error here, but we prefer to ignore extra '/'
 410
 411       if ( *pc == wxT('\0') )
 412         break;
 413     }
 414     else
 415       strCurrent += *pc;
 416
 417     pc++;
 418   }
 419 }
 420
 421 #endif // wxUSE_CONFIG
 422