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 #ifndef WX_PRECOMP
  23     #include  "wx/wx.h"
  24 #endif
  25
  26 #if wxUSE_CONFIG
  27
  28 #ifdef    __BORLANDC__
  29   #pragma hdrstop
  30 #endif  //__BORLANDC__
  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
  38 #include "wx/config.h"
  39
  40 #include <stdlib.h>
  41 #include <math.h>
  42 #include <ctype.h>    // for isalnum()
  43
  44 // ----------------------------------------------------------------------------
  45 // global and class static variables
  46 // ----------------------------------------------------------------------------
  47
  48 wxConfigBase *wxConfigBase::ms_pConfig     = NULL;
  49 bool          wxConfigBase::ms_bAutoCreate = TRUE;
  50
  51 // ============================================================================
  52 // implementation
  53 // ============================================================================
  54
  55 // ----------------------------------------------------------------------------
  56 // wxConfigBase
  57 // ----------------------------------------------------------------------------
  58
  59 // Not all args will always be used by derived classes, but
  60 // including them all in each class ensures compatibility.
  61 wxConfigBase::wxConfigBase(const wxString& appName, const wxString& vendorName,
  62     const wxString& WXUNUSED(localFilename), const wxString& WXUNUSED(globalFilename), long style):
  63         m_appName(appName), m_vendorName(vendorName), m_style(style)
  64 {
  65     m_bExpandEnvVars = TRUE; m_bRecordDefaults = FALSE;
  66 }
  67
  68 wxConfigBase *wxConfigBase::Set(wxConfigBase *pConfig)
  69 {
  70   wxConfigBase *pOld = ms_pConfig;
  71   ms_pConfig = pConfig;
  72   return pOld;
  73 }
  74
  75 wxConfigBase *wxConfigBase::Create()
  76 {
  77   if ( ms_bAutoCreate && ms_pConfig == NULL ) {
  78     ms_pConfig =
  79     #if defined(__WXMSW__) && defined(wxCONFIG_WIN32_NATIVE)
  80       #ifdef __WIN32__
  81         new wxRegConfig(wxTheApp->GetAppName(), wxTheApp->GetVendorName());
  82       #else  //WIN16
  83         new wxIniConfig(wxTheApp->GetAppName(), wxTheApp->GetVendorName());
  84       #endif
  85     #else // either we're under Unix or wish to use files even under Windows
  86       new wxFileConfig(wxTheApp->GetAppName());
  87     #endif
  88   }
  89
  90   return ms_pConfig;
  91 }
  92
  93 wxString wxConfigBase::Read(const wxString& key, const wxString& defVal) const
  94 {
  95   wxString s;
  96   Read(key, &s, defVal);
  97   return s;
  98 }
  99
 100 bool wxConfigBase::Read(const wxString& key, wxString *str, const wxString& defVal) const
 101 {
 102     if (!Read(key, str))
 103     {
 104         *str = ExpandEnvVars(defVal);
 105         return FALSE;
 106     }
 107     else
 108         return TRUE;
 109 }
 110
 111 bool wxConfigBase::Read(const wxString& key, long *pl, long defVal) const
 112 {
 113     if (!Read(key, pl))
 114     {
 115         *pl = defVal;
 116         return FALSE;
 117     }
 118     else
 119         return TRUE;
 120 }
 121
 122 bool wxConfigBase::Read(const wxString& key, double* val) const
 123 {
 124     wxString str;
 125     if (Read(key, & str))
 126     {
 127         *val = wxAtof(str);
 128         return TRUE;
 129     }
 130     else
 131         return FALSE;
 132 }
 133
 134 bool wxConfigBase::Read(const wxString& key, double* val, double defVal) const
 135 {
 136     if (!Read(key, val))
 137     {
 138         *val = defVal;
 139         return FALSE;
 140     }
 141     else
 142         return TRUE;
 143 }
 144
 145 bool wxConfigBase::Read(const wxString& key, bool* val) const
 146 {
 147     long l;
 148     if (Read(key, & l))
 149     {
 150         *val = (l != 0);
 151         return TRUE;
 152     }
 153     else
 154         return FALSE;
 155 }
 156
 157 bool wxConfigBase::Read(const wxString& key, bool* val, bool defVal) const
 158 {
 159     if (!Read(key, val))
 160     {
 161         *val = defVal;
 162         return FALSE;
 163     }
 164     else
 165         return TRUE;
 166 }
 167
 168 // Convenience functions
 169
 170 bool wxConfigBase::Read(const wxString& key, int *pi) const
 171 {
 172     long l;
 173     bool ret = Read(key, &l);
 174     if (ret)
 175         *pi = (int) l;
 176     return ret;
 177 }
 178
 179 bool wxConfigBase::Read(const wxString& key, int *pi, int defVal) const
 180 {
 181     long l;
 182     bool ret = Read(key, &l, (long) defVal);
 183     *pi = (int) l;
 184     return ret;
 185 }
 186
 187 bool wxConfigBase::Write(const wxString& key, double val)
 188 {
 189     wxString str;
 190     str.Printf(_T("%f"), val);
 191     return Write(key, str);
 192 }
 193
 194 bool wxConfigBase::Write(const wxString& key, bool value)
 195 {
 196     long l = (value ? 1 : 0);
 197     return Write(key, l);
 198 }
 199
 200 wxString wxConfigBase::ExpandEnvVars(const wxString& str) const
 201 {
 202     wxString tmp; // Required for BC++
 203     if (IsExpandingEnvVars())
 204         tmp = wxExpandEnvVars(str);
 205     else
 206         tmp = str;
 207     return tmp;
 208 }
 209
 210 // ----------------------------------------------------------------------------
 211 // wxConfigPathChanger
 212 // ----------------------------------------------------------------------------
 213
 214 wxConfigPathChanger::wxConfigPathChanger(const wxConfigBase *pContainer,
 215                                  const wxString& strEntry)
 216 {
 217   m_pContainer = (wxConfigBase *)pContainer;
 218
 219   // the path is everything which precedes the last slash
 220   wxString strPath = strEntry.BeforeLast(wxCONFIG_PATH_SEPARATOR);
 221
 222   // except in the special case of "/keyname" when there is nothing before "/"
 223   if ( strPath.IsEmpty() &&
 224        ((!strEntry.IsEmpty()) && strEntry[0] == wxCONFIG_PATH_SEPARATOR) )
 225   {
 226     strPath = wxCONFIG_PATH_SEPARATOR;
 227   }
 228
 229   if ( !strPath.IsEmpty() ) {
 230     // do change the path
 231     m_bChanged = TRUE;
 232     m_strName = strEntry.AfterLast(wxCONFIG_PATH_SEPARATOR);
 233     m_strOldPath = m_pContainer->GetPath();
 234     m_strOldPath += wxCONFIG_PATH_SEPARATOR;
 235     m_pContainer->SetPath(strPath);
 236   }
 237   else {
 238     // it's a name only, without path - nothing to do
 239     m_bChanged = FALSE;
 240     m_strName = strEntry;
 241   }
 242 }
 243
 244 wxConfigPathChanger::~wxConfigPathChanger()
 245 {
 246   // only restore path if it was changed
 247   if ( m_bChanged ) {
 248     m_pContainer->SetPath(m_strOldPath);
 249   }
 250 }
 251
 252 // ----------------------------------------------------------------------------
 253 // static & global functions
 254 // ----------------------------------------------------------------------------
 255
 256 // understands both Unix and Windows (but only under Windows) environment
 257 // variables expansion: i.e. $var, $(var) and ${var} are always understood
 258 // and in addition under Windows %var% is also.
 259 wxString wxExpandEnvVars(const wxString& str)
 260 {
 261   wxString strResult;
 262   strResult.Alloc(str.Len());
 263
 264   // don't change the values the enum elements: they must be equal
 265   // to the matching [closing] delimiter.
 266   enum Bracket
 267   {
 268     Bracket_None,
 269     Bracket_Normal  = ')',
 270     Bracket_Curly   = '}'
 271 #ifdef  __WXMSW__
 272     ,Bracket_Windows = '%'     // yeah, Windows people are a bit strange ;-)
 273 #endif
 274   };
 275
 276   size_t m;
 277   for ( size_t n = 0; n < str.Len(); n++ ) {
 278     switch ( str[n] ) {
 279 #ifdef  __WXMSW__
 280       case '%':
 281 #endif  //WINDOWS
 282       case '$':
 283         {
 284           Bracket bracket;
 285           #ifdef  __WXMSW__
 286             if ( str[n] == '%' )
 287               bracket = Bracket_Windows;
 288             else
 289           #endif  //WINDOWS
 290           if ( n == str.Len() - 1 ) {
 291             bracket = Bracket_None;
 292           }
 293           else {
 294             switch ( str[n + 1] ) {
 295               case '(':
 296                 bracket = Bracket_Normal;
 297                 n++;                   // skip the bracket
 298                 break;
 299
 300               case '{':
 301                 bracket = Bracket_Curly;
 302                 n++;                   // skip the bracket
 303                 break;
 304
 305               default:
 306                 bracket = Bracket_None;
 307             }
 308           }
 309
 310           m = n + 1;
 311
 312           while ( m < str.Len() && (isalnum(str[m]) || str[m] == '_') )
 313             m++;
 314
 315           wxString strVarName(str.c_str() + n + 1, m - n - 1);
 316
 317           const wxChar *pszValue = wxGetenv(strVarName);
 318           if ( pszValue != NULL ) {
 319             strResult += pszValue;
 320           }
 321           else {
 322             // variable doesn't exist => don't change anything
 323             #ifdef  __WXMSW__
 324               if ( bracket != Bracket_Windows )
 325             #endif
 326                 if ( bracket != Bracket_None )
 327                   strResult << str[n - 1];
 328             strResult << str[n] << strVarName;
 329           }
 330
 331           // check the closing bracket
 332           if ( bracket != Bracket_None ) {
 333             if ( m == str.Len() || str[m] != (char)bracket ) {
 334               wxLogWarning(_("Environment variables expansion failed: "
 335                              "missing '%c' at position %d in '%s'."),
 336                            (char)bracket, m + 1, str.c_str());
 337             }
 338             else {
 339               // skip closing bracket unless the variables wasn't expanded
 340               if ( pszValue == NULL )
 341                 strResult << (char)bracket;
 342               m++;
 343             }
 344           }
 345
 346           n = m - 1;  // skip variable name
 347         }
 348         break;
 349
 350       case '\\':
 351         // backslash can be used to suppress special meaning of % and $
 352         if ( n != str.Len() && (str[n + 1] == '%' || str[n + 1] == '$') ) {
 353           strResult += str[++n];
 354
 355           break;
 356         }
 357         //else: fall through
 358
 359       default:
 360         strResult += str[n];
 361     }
 362   }
 363
 364   return strResult;
 365 }
 366
 367 // this function is used to properly interpret '..' in path
 368 void wxSplitPath(wxArrayString& aParts, const char *sz)
 369 {
 370   aParts.Empty();
 371
 372   wxString strCurrent;
 373   const char *pc = sz;
 374   for ( ;; ) {
 375     if ( *pc == '\0' || *pc == wxCONFIG_PATH_SEPARATOR ) {
 376       if ( strCurrent == "." ) {
 377         // ignore
 378       }
 379       else if ( strCurrent == ".." ) {
 380         // go up one level
 381         if ( aParts.IsEmpty() )
 382           wxLogWarning(_("'%s' has extra '..', ignored."), sz);
 383         else
 384           aParts.Remove(aParts.Count() - 1);
 385
 386         strCurrent.Empty();
 387       }
 388       else if ( !strCurrent.IsEmpty() ) {
 389         aParts.Add(strCurrent);
 390         strCurrent.Empty();
 391       }
 392       //else:
 393         // could log an error here, but we prefer to ignore extra '/'
 394
 395       if ( *pc == '\0' )
 396         return;
 397     }
 398     else
 399       strCurrent += *pc;
 400
 401     pc++;
 402   }
 403 }
 404
 405 #endif // wxUSE_CONFIG
 406