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 licence
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 // ----------------------------------------------------------------------------
  14 // headers
  15 // ----------------------------------------------------------------------------
  16 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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 #include "wx/arrstr.h"
  34
  35 #if wxUSE_CONFIG && ((wxUSE_FILE && wxUSE_TEXTFILE) || wxUSE_CONFIG_NATIVE)
  36
  37 #include "wx/app.h"
  38 #include "wx/file.h"
  39 #include "wx/textfile.h"
  40 #include "wx/utils.h"
  41 #include "wx/utils.h"
  42
  43 #include <stdlib.h>
  44 #include <math.h>
  45 #include <ctype.h>
  46 #include <limits.h>     // for INT_MAX
  47
  48 // ----------------------------------------------------------------------------
  49 // global and class static variables
  50 // ----------------------------------------------------------------------------
  51
  52 wxConfigBase *wxConfigBase::ms_pConfig     = NULL;
  53 bool          wxConfigBase::ms_bAutoCreate = true;
  54
  55 // ============================================================================
  56 // implementation
  57 // ============================================================================
  58
  59 // ----------------------------------------------------------------------------
  60 // wxConfigBase
  61 // ----------------------------------------------------------------------------
  62
  63 // Not all args will always be used by derived classes, but including them all
  64 // in each class ensures compatibility.
  65 wxConfigBase::wxConfigBase(const wxString& appName,
  66                            const wxString& vendorName,
  67                            const wxString& WXUNUSED(localFilename),
  68                            const wxString& WXUNUSED(globalFilename),
  69                            long style)
  70             : m_appName(appName), m_vendorName(vendorName), m_style(style)
  71 {
  72     m_bExpandEnvVars = true;
  73     m_bRecordDefaults = false;
  74 }
  75
  76 wxConfigBase::~wxConfigBase()
  77 {
  78 }
  79
  80 wxConfigBase *wxConfigBase::Set(wxConfigBase *pConfig)
  81 {
  82   wxConfigBase *pOld = ms_pConfig;
  83   ms_pConfig = pConfig;
  84   return pOld;
  85 }
  86
  87 wxConfigBase *wxConfigBase::Create()
  88 {
  89   if ( ms_bAutoCreate && ms_pConfig == NULL ) {
  90     ms_pConfig =
  91     #if defined(__WXMSW__) && wxUSE_CONFIG_NATIVE
  92         new wxRegConfig(wxTheApp->GetAppName(), wxTheApp->GetVendorName());
  93     #else // either we're under Unix or wish to use files even under Windows
  94       new wxFileConfig(wxTheApp->GetAppName());
  95     #endif
  96   }
  97
  98   return ms_pConfig;
  99 }
 100
 101 // ----------------------------------------------------------------------------
 102 // wxConfigBase reading entries
 103 // ----------------------------------------------------------------------------
 104
 105 // implement both Read() overloads for the given type in terms of DoRead()
 106 #define IMPLEMENT_READ_FOR_TYPE(name, type, deftype, extra)                 \
 107     bool wxConfigBase::Read(const wxString& key, type *val) const           \
 108     {                                                                       \
 109         wxCHECK_MSG( val, false, _T("wxConfig::Read(): NULL parameter") );  \
 110                                                                             \
 111         if ( !DoRead##name(key, val) )                                      \
 112             return false;                                                   \
 113                                                                             \
 114         *val = extra(*val);                                                 \
 115                                                                             \
 116         return true;                                                        \
 117     }                                                                       \
 118                                                                             \
 119     bool wxConfigBase::Read(const wxString& key,                            \
 120                             type *val,                                      \
 121                             deftype defVal) const                           \
 122     {                                                                       \
 123         wxCHECK_MSG( val, false, _T("wxConfig::Read(): NULL parameter") );  \
 124                                                                             \
 125         bool read = DoRead##name(key, val);                                 \
 126         if ( !read )                                                        \
 127         {                                                                   \
 128             if ( IsRecordingDefaults() )                                    \
 129             {                                                               \
 130                 ((wxConfigBase *)this)->DoWrite##name(key, defVal);         \
 131             }                                                               \
 132                                                                             \
 133             *val = defVal;                                                  \
 134         }                                                                   \
 135                                                                             \
 136         *val = extra(*val);                                                 \
 137                                                                             \
 138         return read;                                                        \
 139     }
 140
 141
 142 IMPLEMENT_READ_FOR_TYPE(String, wxString, const wxString&, ExpandEnvVars)
 143 IMPLEMENT_READ_FOR_TYPE(Long, long, long, long)
 144 IMPLEMENT_READ_FOR_TYPE(Int, int, int, int)
 145 IMPLEMENT_READ_FOR_TYPE(Double, double, double, double)
 146 IMPLEMENT_READ_FOR_TYPE(Bool, bool, bool, bool)
 147
 148 #undef IMPLEMENT_READ_FOR_TYPE
 149
 150 // the DoReadXXX() for the other types have implementation in the base class
 151 // but can be overridden in the derived ones
 152 bool wxConfigBase::DoReadInt(const wxString& key, int *pi) const
 153 {
 154     wxCHECK_MSG( pi, false, _T("wxConfig::Read(): NULL parameter") );
 155
 156     long l;
 157     if ( !DoReadLong(key, &l) )
 158         return false;
 159
 160     wxASSERT_MSG( l < INT_MAX, _T("overflow in wxConfig::DoReadInt") );
 161
 162     *pi = (int)l;
 163
 164     return true;
 165 }
 166
 167 bool wxConfigBase::DoReadBool(const wxString& key, bool* val) const
 168 {
 169     wxCHECK_MSG( val, false, _T("wxConfig::Read(): NULL parameter") );
 170
 171     long l;
 172     if ( !DoReadLong(key, &l) )
 173         return false;
 174
 175     wxASSERT_MSG( l == 0 || l == 1, _T("bad bool value in wxConfig::DoReadInt") );
 176
 177     *val = l != 0;
 178
 179     return true;
 180 }
 181
 182 bool wxConfigBase::DoReadDouble(const wxString& key, double* val) const
 183 {
 184     wxString str;
 185     if ( Read(key, &str) )
 186     {
 187         return str.ToDouble(val);
 188     }
 189
 190     return false;
 191 }
 192
 193 // string reading helper
 194 wxString wxConfigBase::ExpandEnvVars(const wxString& str) const
 195 {
 196     wxString tmp; // Required for BC++
 197     if (IsExpandingEnvVars())
 198         tmp = wxExpandEnvVars(str);
 199     else
 200         tmp = str;
 201     return tmp;
 202 }
 203
 204 // ----------------------------------------------------------------------------
 205 // wxConfigBase writing
 206 // ----------------------------------------------------------------------------
 207
 208 bool wxConfigBase::DoWriteDouble(const wxString& key, double val)
 209 {
 210     return DoWriteString(key, wxString::Format(_T("%g"), val));
 211 }
 212
 213 bool wxConfigBase::DoWriteInt(const wxString& key, int value)
 214 {
 215     return DoWriteLong(key, (long)value);
 216 }
 217
 218 bool wxConfigBase::DoWriteBool(const wxString& key, bool value)
 219 {
 220     return DoWriteLong(key, value ? 1l : 0l);
 221 }
 222
 223 // ----------------------------------------------------------------------------
 224 // wxConfigPathChanger
 225 // ----------------------------------------------------------------------------
 226
 227 wxConfigPathChanger::wxConfigPathChanger(const wxConfigBase *pContainer,
 228                                  const wxString& strEntry)
 229 {
 230   m_pContainer = (wxConfigBase *)pContainer;
 231
 232   // the path is everything which precedes the last slash
 233   wxString strPath = strEntry.BeforeLast(wxCONFIG_PATH_SEPARATOR);
 234
 235   // except in the special case of "/keyname" when there is nothing before "/"
 236   if ( strPath.IsEmpty() &&
 237        ((!strEntry.IsEmpty()) && strEntry[0] == wxCONFIG_PATH_SEPARATOR) )
 238   {
 239     strPath = wxCONFIG_PATH_SEPARATOR;
 240   }
 241
 242   if ( !strPath.IsEmpty() ) {
 243     // do change the path
 244     m_bChanged = true;
 245     m_strName = strEntry.AfterLast(wxCONFIG_PATH_SEPARATOR);
 246     m_strOldPath = m_pContainer->GetPath();
 247     if ( m_strOldPath.Len() == 0 ||
 248          m_strOldPath.Last() != wxCONFIG_PATH_SEPARATOR )
 249         m_strOldPath += wxCONFIG_PATH_SEPARATOR;
 250     m_pContainer->SetPath(strPath);
 251   }
 252   else {
 253     // it's a name only, without path - nothing to do
 254     m_bChanged = false;
 255     m_strName = strEntry;
 256   }
 257 }
 258
 259 wxConfigPathChanger::~wxConfigPathChanger()
 260 {
 261   // only restore path if it was changed
 262   if ( m_bChanged ) {
 263     m_pContainer->SetPath(m_strOldPath);
 264   }
 265 }
 266
 267 #endif // wxUSE_CONFIG
 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 ${var} are always understood
 275 // and in addition under Windows %var% is also.
 276 wxString wxExpandEnvVars(const wxString& str)
 277 {
 278   wxString strResult;
 279   strResult.Alloc(str.Len());
 280
 281   // don't change the values the enum elements: they must be equal
 282   // to the matching [closing] delimiter.
 283   enum Bracket
 284   {
 285     Bracket_None,
 286     Bracket_Normal  = ')',
 287     Bracket_Curly   = '}',
 288 #ifdef  __WXMSW__
 289     Bracket_Windows = '%',    // yeah, Windows people are a bit strange ;-)
 290 #endif
 291     Bracket_Max
 292   };
 293
 294   size_t m;
 295   for ( size_t n = 0; n < str.Len(); n++ ) {
 296     switch ( str[n] ) {
 297 #ifdef  __WXMSW__
 298       case wxT('%'):
 299 #endif  //WINDOWS
 300       case wxT('$'):
 301         {
 302           Bracket bracket;
 303           #ifdef  __WXMSW__
 304             if ( str[n] == wxT('%') )
 305               bracket = Bracket_Windows;
 306             else
 307           #endif  //WINDOWS
 308           if ( n == str.Len() - 1 ) {
 309             bracket = Bracket_None;
 310           }
 311           else {
 312             switch ( str[n + 1] ) {
 313               case wxT('('):
 314                 bracket = Bracket_Normal;
 315                 n++;                   // skip the bracket
 316                 break;
 317
 318               case wxT('{'):
 319                 bracket = Bracket_Curly;
 320                 n++;                   // skip the bracket
 321                 break;
 322
 323               default:
 324                 bracket = Bracket_None;
 325             }
 326           }
 327
 328           m = n + 1;
 329
 330           while ( m < str.Len() && (wxIsalnum(str[m]) || str[m] == wxT('_')) )
 331             m++;
 332
 333           wxString strVarName(str.c_str() + n + 1, m - n - 1);
 334
 335 #ifdef __WXWINCE__
 336           const wxChar *pszValue = NULL;
 337 #else
 338           const wxChar *pszValue = wxGetenv(strVarName);
 339 #endif
 340           if ( pszValue != NULL ) {
 341             strResult += pszValue;
 342           }
 343           else {
 344             // variable doesn't exist => don't change anything
 345             #ifdef  __WXMSW__
 346               if ( bracket != Bracket_Windows )
 347             #endif
 348                 if ( bracket != Bracket_None )
 349                   strResult << str[n - 1];
 350             strResult << str[n] << strVarName;
 351           }
 352
 353           // check the closing bracket
 354           if ( bracket != Bracket_None ) {
 355             if ( m == str.Len() || str[m] != (wxChar)bracket ) {
 356               // under MSW it's common to have '%' characters in the registry
 357               // and it's annoying to have warnings about them each time, so
 358               // ignroe them silently if they are not used for env vars
 359               //
 360               // under Unix, OTOH, this warning could be useful for the user to
 361               // understand why isn't the variable expanded as intended
 362               #ifndef __WXMSW__
 363                 wxLogWarning(_("Environment variables expansion failed: missing '%c' at position %d in '%s'."),
 364                              (char)bracket, m + 1, str.c_str());
 365               #endif // __WXMSW__
 366             }
 367             else {
 368               // skip closing bracket unless the variables wasn't expanded
 369               if ( pszValue == NULL )
 370                 strResult << (char)bracket;
 371               m++;
 372             }
 373           }
 374
 375           n = m - 1;  // skip variable name
 376         }
 377         break;
 378
 379       case '\\':
 380         // backslash can be used to suppress special meaning of % and $
 381         if ( n != str.Len() && (str[n + 1] == wxT('%') || str[n + 1] == wxT('$')) ) {
 382           strResult += str[++n];
 383
 384           break;
 385         }
 386         //else: fall through
 387
 388       default:
 389         strResult += str[n];
 390     }
 391   }
 392
 393   return strResult;
 394 }
 395
 396 // this function is used to properly interpret '..' in path
 397 void wxSplitPath(wxArrayString& aParts, const wxChar *sz)
 398 {
 399   aParts.clear();
 400
 401   wxString strCurrent;
 402   const wxChar *pc = sz;
 403   for ( ;; ) {
 404     if ( *pc == wxT('\0') || *pc == wxCONFIG_PATH_SEPARATOR ) {
 405       if ( strCurrent == wxT(".") ) {
 406         // ignore
 407       }
 408       else if ( strCurrent == wxT("..") ) {
 409         // go up one level
 410         if ( aParts.size() == 0 )
 411           wxLogWarning(_("'%s' has extra '..', ignored."), sz);
 412         else
 413           aParts.erase(aParts.end() - 1);
 414
 415         strCurrent.Empty();
 416       }
 417       else if ( !strCurrent.IsEmpty() ) {
 418         aParts.push_back(strCurrent);
 419         strCurrent.Empty();
 420       }
 421       //else:
 422         // could log an error here, but we prefer to ignore extra '/'
 423
 424       if ( *pc == wxT('\0') )
 425         break;
 426     }
 427     else
 428       strCurrent += *pc;
 429
 430     pc++;
 431   }
 432 }
 433
 434