src/common/config.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/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 Ballueder  Ballueder@usa.net
   9 //                       Vadim Zeitlin      <zeitlin@dptmaths.ens-cachan.fr>
  10 // Licence:     wxWindows licence
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 // ----------------------------------------------------------------------------
  14 // headers
  15 // ----------------------------------------------------------------------------
  16
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20     #pragma hdrstop
  21 #endif  //__BORLANDC__
  22
  23 #ifndef wxUSE_CONFIG_NATIVE
  24     #define wxUSE_CONFIG_NATIVE 1
  25 #endif
  26
  27 #include "wx/config.h"
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/intl.h"
  31     #include "wx/log.h"
  32     #include "wx/app.h"
  33     #include "wx/utils.h"
  34     #include "wx/arrstr.h"
  35     #include "wx/math.h"
  36 #endif //WX_PRECOMP
  37
  38 #if wxUSE_CONFIG && ((wxUSE_FILE && wxUSE_TEXTFILE) || wxUSE_CONFIG_NATIVE)
  39
  40 #include "wx/apptrait.h"
  41 #include "wx/file.h"
  42
  43 #include <stdlib.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 // wxAppTraitsBase
  60 // ----------------------------------------------------------------------------
  61
  62 wxConfigBase *wxAppTraitsBase::CreateConfig()
  63 {
  64     return new
  65     #if defined(__WXMSW__) && wxUSE_CONFIG_NATIVE
  66         wxRegConfig(wxTheApp->GetAppName(), wxTheApp->GetVendorName());
  67     #elif defined(__WXPALMOS__) && wxUSE_CONFIG_NATIVE
  68         wxPrefConfig(wxTheApp->GetAppName());
  69     #else // either we're under Unix or wish to use files even under Windows
  70         wxFileConfig(wxTheApp->GetAppName());
  71     #endif
  72 }
  73
  74 // ----------------------------------------------------------------------------
  75 // wxConfigBase
  76 // ----------------------------------------------------------------------------
  77 IMPLEMENT_ABSTRACT_CLASS(wxConfigBase, wxObject)
  78
  79 // Not all args will always be used by derived classes, but including them all
  80 // in each class ensures compatibility.
  81 wxConfigBase::wxConfigBase(const wxString& appName,
  82                            const wxString& vendorName,
  83                            const wxString& WXUNUSED(localFilename),
  84                            const wxString& WXUNUSED(globalFilename),
  85                            long style)
  86             : m_appName(appName), m_vendorName(vendorName), m_style(style)
  87 {
  88     m_bExpandEnvVars = true;
  89     m_bRecordDefaults = false;
  90 }
  91
  92 wxConfigBase::~wxConfigBase()
  93 {
  94     // required here for Darwin
  95 }
  96
  97 wxConfigBase *wxConfigBase::Set(wxConfigBase *pConfig)
  98 {
  99   wxConfigBase *pOld = ms_pConfig;
 100   ms_pConfig = pConfig;
 101   return pOld;
 102 }
 103
 104 wxConfigBase *wxConfigBase::Create()
 105 {
 106   if ( ms_bAutoCreate && ms_pConfig == NULL ) {
 107     wxAppTraits * const traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
 108     wxCHECK_MSG( traits, NULL, wxT("create wxApp before calling this") );
 109
 110     ms_pConfig = traits->CreateConfig();
 111   }
 112
 113   return ms_pConfig;
 114 }
 115
 116 // ----------------------------------------------------------------------------
 117 // wxConfigBase reading entries
 118 // ----------------------------------------------------------------------------
 119
 120 // implement both Read() overloads for the given type in terms of DoRead()
 121 #define IMPLEMENT_READ_FOR_TYPE(name, type, deftype, extra)                 \
 122     bool wxConfigBase::Read(const wxString& key, type *val) const           \
 123     {                                                                       \
 124         wxCHECK_MSG( val, false, wxT("wxConfig::Read(): NULL parameter") );  \
 125                                                                             \
 126         if ( !DoRead##name(key, val) )                                      \
 127             return false;                                                   \
 128                                                                             \
 129         *val = extra(*val);                                                 \
 130                                                                             \
 131         return true;                                                        \
 132     }                                                                       \
 133                                                                             \
 134     bool wxConfigBase::Read(const wxString& key,                            \
 135                             type *val,                                      \
 136                             deftype defVal) const                           \
 137     {                                                                       \
 138         wxCHECK_MSG( val, false, wxT("wxConfig::Read(): NULL parameter") );  \
 139                                                                             \
 140         bool read = DoRead##name(key, val);                                 \
 141         if ( !read )                                                        \
 142         {                                                                   \
 143             if ( IsRecordingDefaults() )                                    \
 144             {                                                               \
 145                 ((wxConfigBase *)this)->DoWrite##name(key, defVal);         \
 146             }                                                               \
 147                                                                             \
 148             *val = defVal;                                                  \
 149         }                                                                   \
 150                                                                             \
 151         *val = extra(*val);                                                 \
 152                                                                             \
 153         return read;                                                        \
 154     }
 155
 156
 157 IMPLEMENT_READ_FOR_TYPE(String, wxString, const wxString&, ExpandEnvVars)
 158 IMPLEMENT_READ_FOR_TYPE(Long, long, long, long)
 159 IMPLEMENT_READ_FOR_TYPE(Double, double, double, double)
 160 IMPLEMENT_READ_FOR_TYPE(Bool, bool, bool, bool)
 161
 162 #undef IMPLEMENT_READ_FOR_TYPE
 163
 164 // int is stored as long
 165 bool wxConfigBase::Read(const wxString& key, int *pi) const
 166 {
 167     long l = *pi;
 168     bool r = Read(key, &l);
 169     wxASSERT_MSG( l < INT_MAX, wxT("int overflow in wxConfig::Read") );
 170     *pi = (int)l;
 171     return r;
 172 }
 173
 174 bool wxConfigBase::Read(const wxString& key, int *pi, int defVal) const
 175 {
 176     long l = *pi;
 177     bool r = Read(key, &l, defVal);
 178     wxASSERT_MSG( l < INT_MAX, wxT("int overflow in wxConfig::Read") );
 179     *pi = (int)l;
 180     return r;
 181 }
 182
 183 // the DoReadXXX() for the other types have implementation in the base class
 184 // but can be overridden in the derived ones
 185 bool wxConfigBase::DoReadBool(const wxString& key, bool* val) const
 186 {
 187     wxCHECK_MSG( val, false, wxT("wxConfig::Read(): NULL parameter") );
 188
 189     long l;
 190     if ( !DoReadLong(key, &l) )
 191         return false;
 192
 193     wxASSERT_MSG( l == 0 || l == 1, wxT("bad bool value in wxConfig::DoReadInt") );
 194
 195     *val = l != 0;
 196
 197     return true;
 198 }
 199
 200 bool wxConfigBase::DoReadDouble(const wxString& key, double* val) const
 201 {
 202     wxString str;
 203     if ( Read(key, &str) )
 204     {
 205         return str.ToDouble(val);
 206     }
 207
 208     return false;
 209 }
 210
 211 // string reading helper
 212 wxString wxConfigBase::ExpandEnvVars(const wxString& str) const
 213 {
 214     wxString tmp; // Required for BC++
 215     if (IsExpandingEnvVars())
 216         tmp = wxExpandEnvVars(str);
 217     else
 218         tmp = str;
 219     return tmp;
 220 }
 221
 222 // ----------------------------------------------------------------------------
 223 // wxConfigBase writing
 224 // ----------------------------------------------------------------------------
 225
 226 bool wxConfigBase::DoWriteDouble(const wxString& key, double val)
 227 {
 228     return DoWriteString(key, wxString::Format(wxT("%g"), val));
 229 }
 230
 231 bool wxConfigBase::DoWriteBool(const wxString& key, bool value)
 232 {
 233     return DoWriteLong(key, value ? 1l : 0l);
 234 }
 235
 236 // ----------------------------------------------------------------------------
 237 // wxConfigPathChanger
 238 // ----------------------------------------------------------------------------
 239
 240 wxConfigPathChanger::wxConfigPathChanger(const wxConfigBase *pContainer,
 241                                          const wxString& strEntry)
 242 {
 243   m_bChanged = false;
 244   m_pContainer = (wxConfigBase *)pContainer;
 245
 246   // the path is everything which precedes the last slash
 247   wxString strPath = strEntry.BeforeLast(wxCONFIG_PATH_SEPARATOR);
 248
 249   // except in the special case of "/keyname" when there is nothing before "/"
 250   if ( strPath.empty() &&
 251        ((!strEntry.empty()) && strEntry[0] == wxCONFIG_PATH_SEPARATOR) )
 252   {
 253     strPath = wxCONFIG_PATH_SEPARATOR;
 254   }
 255
 256   if ( !strPath.empty() )
 257   {
 258     if ( m_pContainer->GetPath() != strPath )
 259     {
 260         // we do change the path so restore it later
 261         m_bChanged = true;
 262
 263         /* JACS: work around a memory bug that causes an assert
 264            when using wxRegConfig, related to reference-counting.
 265            Can be reproduced by removing .wc_str() below and
 266            adding the following code to the config sample OnInit under
 267            Windows:
 268
 269            pConfig->SetPath(wxT("MySettings"));
 270            pConfig->SetPath(wxT(".."));
 271            int value;
 272            pConfig->Read(wxT("MainWindowX"), & value);
 273         */
 274         m_strOldPath = m_pContainer->GetPath().wc_str();
 275         if ( *m_strOldPath.c_str() != wxCONFIG_PATH_SEPARATOR )
 276           m_strOldPath += wxCONFIG_PATH_SEPARATOR;
 277         m_pContainer->SetPath(strPath);
 278     }
 279
 280     // in any case, use the just the name, not full path
 281     m_strName = strEntry.AfterLast(wxCONFIG_PATH_SEPARATOR);
 282   }
 283   else {
 284     // it's a name only, without path - nothing to do
 285     m_strName = strEntry;
 286   }
 287 }
 288
 289 void wxConfigPathChanger::UpdateIfDeleted()
 290 {
 291     // we don't have to do anything at all if we didn't change the path
 292     if ( !m_bChanged )
 293         return;
 294
 295     // find the deepest still existing parent path of the original path
 296     while ( !m_pContainer->HasGroup(m_strOldPath) )
 297     {
 298         m_strOldPath = m_strOldPath.BeforeLast(wxCONFIG_PATH_SEPARATOR);
 299         if ( m_strOldPath.empty() )
 300             m_strOldPath = wxCONFIG_PATH_SEPARATOR;
 301     }
 302 }
 303
 304 wxConfigPathChanger::~wxConfigPathChanger()
 305 {
 306   // only restore path if it was changed
 307   if ( m_bChanged ) {
 308     m_pContainer->SetPath(m_strOldPath);
 309   }
 310 }
 311
 312 // this is a wxConfig method but it's mainly used with wxConfigPathChanger
 313 /* static */
 314 wxString wxConfigBase::RemoveTrailingSeparator(const wxString& key)
 315 {
 316     wxString path(key);
 317
 318     // don't remove the only separator from a root group path!
 319     while ( path.length() > 1 )
 320     {
 321         if ( *path.rbegin() != wxCONFIG_PATH_SEPARATOR )
 322             break;
 323
 324         path.erase(path.end() - 1);
 325     }
 326
 327     return path;
 328 }
 329
 330 #endif // wxUSE_CONFIG
 331
 332 // ----------------------------------------------------------------------------
 333 // static & global functions
 334 // ----------------------------------------------------------------------------
 335
 336 // understands both Unix and Windows (but only under Windows) environment
 337 // variables expansion: i.e. $var, $(var) and ${var} are always understood
 338 // and in addition under Windows %var% is also.
 339
 340 // don't change the values the enum elements: they must be equal
 341 // to the matching [closing] delimiter.
 342 enum Bracket
 343 {
 344   Bracket_None,
 345   Bracket_Normal  = ')',
 346   Bracket_Curly   = '}',
 347 #ifdef  __WXMSW__
 348   Bracket_Windows = '%',    // yeah, Windows people are a bit strange ;-)
 349 #endif
 350   Bracket_Max
 351 };
 352
 353 wxString wxExpandEnvVars(const wxString& str)
 354 {
 355   wxString strResult;
 356   strResult.Alloc(str.length());
 357
 358   size_t m;
 359   for ( size_t n = 0; n < str.length(); n++ ) {
 360     switch ( str[n].GetValue() ) {
 361 #ifdef  __WXMSW__
 362       case wxT('%'):
 363 #endif  //WINDOWS
 364       case wxT('$'):
 365         {
 366           Bracket bracket;
 367           #ifdef  __WXMSW__
 368             if ( str[n] == wxT('%') )
 369               bracket = Bracket_Windows;
 370             else
 371           #endif  //WINDOWS
 372           if ( n == str.length() - 1 ) {
 373             bracket = Bracket_None;
 374           }
 375           else {
 376             switch ( str[n + 1].GetValue() ) {
 377               case wxT('('):
 378                 bracket = Bracket_Normal;
 379                 n++;                   // skip the bracket
 380                 break;
 381
 382               case wxT('{'):
 383                 bracket = Bracket_Curly;
 384                 n++;                   // skip the bracket
 385                 break;
 386
 387               default:
 388                 bracket = Bracket_None;
 389             }
 390           }
 391
 392           m = n + 1;
 393
 394           while ( m < str.length() && (wxIsalnum(str[m]) || str[m] == wxT('_')) )
 395             m++;
 396
 397           wxString strVarName(str.c_str() + n + 1, m - n - 1);
 398
 399 #ifdef __WXWINCE__
 400           const bool expanded = false;
 401 #else
 402           // NB: use wxGetEnv instead of wxGetenv as otherwise variables
 403           //     set through wxSetEnv may not be read correctly!
 404           bool expanded = false;
 405           wxString tmp;
 406           if (wxGetEnv(strVarName, &tmp))
 407           {
 408               strResult += tmp;
 409               expanded = true;
 410           }
 411           else
 412 #endif
 413           {
 414             // variable doesn't exist => don't change anything
 415             #ifdef  __WXMSW__
 416               if ( bracket != Bracket_Windows )
 417             #endif
 418                 if ( bracket != Bracket_None )
 419                   strResult << str[n - 1];
 420             strResult << str[n] << strVarName;
 421           }
 422
 423           // check the closing bracket
 424           if ( bracket != Bracket_None ) {
 425             if ( m == str.length() || str[m] != (wxChar)bracket ) {
 426               // under MSW it's common to have '%' characters in the registry
 427               // and it's annoying to have warnings about them each time, so
 428               // ignroe them silently if they are not used for env vars
 429               //
 430               // under Unix, OTOH, this warning could be useful for the user to
 431               // understand why isn't the variable expanded as intended
 432               #ifndef __WXMSW__
 433                 wxLogWarning(_("Environment variables expansion failed: missing '%c' at position %u in '%s'."),
 434                              (char)bracket, (unsigned int) (m + 1), str.c_str());
 435               #endif // __WXMSW__
 436             }
 437             else {
 438               // skip closing bracket unless the variables wasn't expanded
 439               if ( !expanded )
 440                 strResult << (wxChar)bracket;
 441               m++;
 442             }
 443           }
 444
 445           n = m - 1;  // skip variable name
 446         }
 447         break;
 448
 449       case wxT('\\'):
 450         // backslash can be used to suppress special meaning of % and $
 451         if ( n != str.length() - 1 &&
 452                 (str[n + 1] == wxT('%') || str[n + 1] == wxT('$')) ) {
 453           strResult += str[++n];
 454
 455           break;
 456         }
 457         //else: fall through
 458
 459       default:
 460         strResult += str[n];
 461     }
 462   }
 463
 464   return strResult;
 465 }
 466
 467 // this function is used to properly interpret '..' in path
 468 void wxSplitPath(wxArrayString& aParts, const wxString& path)
 469 {
 470   aParts.clear();
 471
 472   wxString strCurrent;
 473   wxString::const_iterator pc = path.begin();
 474   for ( ;; ) {
 475     if ( pc == path.end() || *pc == wxCONFIG_PATH_SEPARATOR ) {
 476       if ( strCurrent == wxT(".") ) {
 477         // ignore
 478       }
 479       else if ( strCurrent == wxT("..") ) {
 480         // go up one level
 481         if ( aParts.size() == 0 )
 482         {
 483           wxLogWarning(_("'%s' has extra '..', ignored."), path);
 484         }
 485         else
 486         {
 487           aParts.erase(aParts.end() - 1);
 488         }
 489
 490         strCurrent.Empty();
 491       }
 492       else if ( !strCurrent.empty() ) {
 493         aParts.push_back(strCurrent);
 494         strCurrent.Empty();
 495       }
 496       //else:
 497         // could log an error here, but we prefer to ignore extra '/'
 498
 499       if ( pc == path.end() )
 500         break;
 501     }
 502     else
 503       strCurrent += *pc;
 504
 505     ++pc;
 506   }
 507 }