include/wx/intl.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/intl.h
   3 // Purpose:     Internationalization and localisation for wxWidgets
   4 // Author:      Vadim Zeitlin
   5 // Modified by: Michael N. Filippov <michael@idisys.iae.nsk.su>
   6 //              (2003/09/30 - plural forms support)
   7 // Created:     29/01/98
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
  10 // Licence:     wxWindows licence
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 #ifndef _WX_INTL_H_
  14 #define _WX_INTL_H_
  15
  16 #include "wx/defs.h"
  17 #include "wx/string.h"
  18 #include "wx/translation.h"
  19
  20 // Make wxLayoutDirection enum available without need for wxUSE_INTL so wxWindow, wxApp
  21 // and other classes are not distrubed by wxUSE_INTL
  22
  23 enum wxLayoutDirection
  24 {
  25     wxLayout_Default,
  26     wxLayout_LeftToRight,
  27     wxLayout_RightToLeft
  28 };
  29
  30 #if wxUSE_INTL
  31
  32 #include "wx/fontenc.h"
  33 #include "wx/language.h"
  34
  35 // ============================================================================
  36 // global decls
  37 // ============================================================================
  38
  39 // ----------------------------------------------------------------------------
  40 // macros
  41 // ----------------------------------------------------------------------------
  42
  43 // ----------------------------------------------------------------------------
  44 // forward decls
  45 // ----------------------------------------------------------------------------
  46
  47 class WXDLLIMPEXP_FWD_BASE wxLocale;
  48 class WXDLLIMPEXP_FWD_BASE wxLanguageInfoArray;
  49
  50 // ============================================================================
  51 // locale support
  52 // ============================================================================
  53
  54 // ----------------------------------------------------------------------------
  55 // wxLanguageInfo: encapsulates wxLanguage to OS native lang.desc.
  56 //                 translation information
  57 // ----------------------------------------------------------------------------
  58
  59 struct WXDLLIMPEXP_BASE wxLanguageInfo
  60 {
  61     int Language;                   // wxLanguage id
  62     wxString CanonicalName;         // Canonical name, e.g. fr_FR
  63 #ifdef __WXMSW__
  64     wxUint32 WinLang,               // Win32 language identifiers
  65              WinSublang;
  66 #endif // __WXMSW__
  67     wxString Description;           // human-readable name of the language
  68     wxLayoutDirection LayoutDirection;
  69
  70 #ifdef __WXMSW__
  71     // return the LCID corresponding to this language
  72     wxUint32 GetLCID() const;
  73 #endif // __WXMSW__
  74
  75     // return the locale name corresponding to this language usable with
  76     // setlocale() on the current system
  77     wxString GetLocaleName() const;
  78 };
  79
  80 // for Unix systems GetLocaleName() is trivial so implement it inline here, for
  81 // MSW it's implemented in intl.cpp
  82 #ifndef __WXMSW__
  83 inline wxString wxLanguageInfo::GetLocaleName() const { return CanonicalName; }
  84 #endif // !__WXMSW__
  85
  86
  87 // ----------------------------------------------------------------------------
  88 // wxLocaleCategory: the category of locale settings
  89 // ----------------------------------------------------------------------------
  90
  91 enum wxLocaleCategory
  92 {
  93     // (any) numbers
  94     wxLOCALE_CAT_NUMBER,
  95
  96     // date/time
  97     wxLOCALE_CAT_DATE,
  98
  99     // monetary value
 100     wxLOCALE_CAT_MONEY,
 101
 102     // default category for wxLocaleInfo values which only apply to a single
 103     // category (e.g. wxLOCALE_SHORT_DATE_FMT)
 104     wxLOCALE_CAT_DEFAULT,
 105
 106     wxLOCALE_CAT_MAX
 107 };
 108
 109 // ----------------------------------------------------------------------------
 110 // wxLocaleInfo: the items understood by wxLocale::GetInfo()
 111 // ----------------------------------------------------------------------------
 112
 113 enum wxLocaleInfo
 114 {
 115     // the thousands separator (for wxLOCALE_CAT_NUMBER or MONEY)
 116     wxLOCALE_THOUSANDS_SEP,
 117
 118     // the character used as decimal point (for wxLOCALE_CAT_NUMBER or MONEY)
 119     wxLOCALE_DECIMAL_POINT,
 120
 121     // the stftime()-formats used for short/long date and time representations
 122     // (under some platforms short and long date formats are the same)
 123     //
 124     // NB: these elements should appear in this order, code in GetInfo() relies
 125     //     on it
 126     wxLOCALE_SHORT_DATE_FMT,
 127     wxLOCALE_LONG_DATE_FMT,
 128     wxLOCALE_DATE_TIME_FMT,
 129     wxLOCALE_TIME_FMT
 130
 131 };
 132
 133 // ----------------------------------------------------------------------------
 134 // wxLocale: encapsulates all language dependent settings, including current
 135 //           message catalogs, date, time and currency formats (TODO) &c
 136 // ----------------------------------------------------------------------------
 137
 138 enum wxLocaleInitFlags
 139 {
 140     wxLOCALE_DONT_LOAD_DEFAULT = 0x0000,     // don't load wxwin.mo
 141     wxLOCALE_LOAD_DEFAULT      = 0x0001      // load wxwin.mo?
 142 #if WXWIN_COMPATIBILITY_2_8
 143    ,wxLOCALE_CONV_ENCODING     = 0x0002      // no longer used, simply remove
 144                                              // it from the existing code
 145 #endif
 146 };
 147
 148 class WXDLLIMPEXP_BASE wxLocale
 149 {
 150 public:
 151     // ctor & dtor
 152     // -----------
 153
 154         // call Init() if you use this ctor
 155     wxLocale() { DoCommonInit(); }
 156
 157         // the ctor has a side effect of changing current locale
 158     wxLocale(const wxString& name,                               // name (for messages)
 159              const wxString& shortName = wxEmptyString,      // dir prefix (for msg files)
 160              const wxString& locale = wxEmptyString,     // locale (for setlocale)
 161              bool bLoadDefault = true                            // preload wxstd.mo?
 162 #if WXWIN_COMPATIBILITY_2_8
 163              ,bool bConvertEncoding = true                      // convert Win<->Unix if necessary?
 164 #endif
 165              )
 166         {
 167             DoCommonInit();
 168
 169 #if WXWIN_COMPATIBILITY_2_8
 170             Init(name, shortName, locale, bLoadDefault, bConvertEncoding);
 171 #else
 172             Init(name, shortName, locale, bLoadDefault);
 173 #endif
 174         }
 175
 176     wxLocale(int language, // wxLanguage id or custom language
 177              int flags = wxLOCALE_LOAD_DEFAULT)
 178         {
 179             DoCommonInit();
 180
 181             Init(language, flags);
 182         }
 183
 184         // the same as a function (returns true on success)
 185     bool Init(const wxString& name,
 186               const wxString& shortName = wxEmptyString,
 187               const wxString& locale = wxEmptyString,
 188               bool bLoadDefault = true
 189 #if WXWIN_COMPATIBILITY_2_8
 190               ,bool bConvertEncoding = true
 191 #endif
 192               );
 193
 194         // same as second ctor (returns true on success)
 195     bool Init(int language = wxLANGUAGE_DEFAULT,
 196               int flags = wxLOCALE_LOAD_DEFAULT);
 197
 198         // restores old locale
 199     virtual ~wxLocale();
 200
 201     // Try to get user's (or OS's) preferred language setting.
 202     // Return wxLANGUAGE_UNKNOWN if language-guessing algorithm failed
 203     static int GetSystemLanguage();
 204
 205     // get the encoding used by default for text on this system, returns
 206     // wxFONTENCODING_SYSTEM if it couldn't be determined
 207     static wxFontEncoding GetSystemEncoding();
 208
 209     // get the string describing the system encoding, return empty string if
 210     // couldn't be determined
 211     static wxString GetSystemEncodingName();
 212
 213     // get the values of the given locale-dependent datum: the current locale
 214     // is used, the US default value is returned if everything else fails
 215     static wxString GetInfo(wxLocaleInfo index,
 216                             wxLocaleCategory cat = wxLOCALE_CAT_DEFAULT);
 217
 218     // return true if the locale was set successfully
 219     bool IsOk() const { return m_pszOldLocale != NULL; }
 220
 221     // returns locale name
 222     const wxString& GetLocale() const { return m_strLocale; }
 223
 224     // return current locale wxLanguage value
 225     int GetLanguage() const { return m_language; }
 226
 227     // return locale name to be passed to setlocale()
 228     wxString GetSysName() const;
 229
 230     // return 'canonical' name, i.e. in the form of xx[_YY], where xx is
 231     // language code according to ISO 639 and YY is country name
 232     // as specified by ISO 3166.
 233     wxString GetCanonicalName() const { return m_strShort; }
 234
 235     // add a prefix to the catalog lookup path: the message catalog files will be
 236     // looked up under prefix/<lang>/LC_MESSAGES, prefix/LC_MESSAGES and prefix
 237     // (in this order).
 238     //
 239     // This only applies to subsequent invocations of AddCatalog()!
 240     static void AddCatalogLookupPathPrefix(const wxString& prefix)
 241         { wxFileTranslationsLoader::AddCatalogLookupPathPrefix(prefix); }
 242
 243     // add a catalog: it's searched for in standard places (current directory
 244     // first, system one after), but the you may prepend additional directories to
 245     // the search path with AddCatalogLookupPathPrefix().
 246     //
 247     // The loaded catalog will be used for message lookup by GetString().
 248     //
 249     // Returns 'true' if it was successfully loaded
 250     bool AddCatalog(const wxString& domain);
 251     bool AddCatalog(const wxString& domain, wxLanguage msgIdLanguage);
 252     bool AddCatalog(const wxString& domain,
 253                     wxLanguage msgIdLanguage, const wxString& msgIdCharset);
 254
 255     // check if the given locale is provided by OS and C run time
 256     static bool IsAvailable(int lang);
 257
 258     // check if the given catalog is loaded
 259     bool IsLoaded(const wxString& domain) const;
 260
 261     // Retrieve the language info struct for the given language
 262     //
 263     // Returns NULL if no info found, pointer must *not* be deleted by caller
 264     static const wxLanguageInfo *GetLanguageInfo(int lang);
 265
 266     // Returns language name in English or empty string if the language
 267     // is not in database
 268     static wxString GetLanguageName(int lang);
 269
 270     // Returns ISO code ("canonical name") of language or empty string if the
 271     // language is not in database
 272     static wxString GetLanguageCanonicalName(int lang);
 273
 274     // Find the language for the given locale string which may be either a
 275     // canonical ISO 2 letter language code ("xx"), a language code followed by
 276     // the country code ("xx_XX") or a Windows full language name ("Xxxxx...")
 277     //
 278     // Returns NULL if no info found, pointer must *not* be deleted by caller
 279     static const wxLanguageInfo *FindLanguageInfo(const wxString& locale);
 280
 281     // Add custom language to the list of known languages.
 282     // Notes: 1) wxLanguageInfo contains platform-specific data
 283     //        2) must be called before Init to have effect
 284     static void AddLanguage(const wxLanguageInfo& info);
 285
 286     // retrieve the translation for a string in all loaded domains unless
 287     // the szDomain parameter is specified (and then only this domain is
 288     // searched)
 289     // n - additional parameter for PluralFormsParser
 290     //
 291     // return original string if translation is not available
 292     // (in this case an error message is generated the first time
 293     //  a string is not found; use wxLogNull to suppress it)
 294     //
 295     // domains are searched in the last to first order, i.e. catalogs
 296     // added later override those added before.
 297     const wxString& GetString(const wxString& origString,
 298                               const wxString& domain = wxEmptyString) const
 299     {
 300         return wxGetTranslation(origString, domain);
 301     }
 302     // plural form version of the same:
 303     const wxString& GetString(const wxString& origString,
 304                               const wxString& origString2,
 305                               unsigned n,
 306                               const wxString& domain = wxEmptyString) const
 307     {
 308         return wxGetTranslation(origString, origString2, n, domain);
 309     }
 310
 311     // this is hack to work around a problem with wxGetTranslation() which
 312     // returns const wxString& and not wxString, so when it returns untranslated
 313     // string, it needs to have a copy of it somewhere
 314     static const wxString& GetUntranslatedString(const wxString& str)
 315         { return wxTranslations::GetUntranslatedString(str); }
 316
 317     // Returns the current short name for the locale
 318     const wxString& GetName() const { return m_strShort; }
 319
 320     // return the contents of .po file header
 321     wxString GetHeaderValue(const wxString& header,
 322                             const wxString& domain = wxEmptyString) const;
 323
 324     // These two methods are for internal use only. First one creates
 325     // ms_languagesDB if it doesn't already exist, second one destroys
 326     // it.
 327     static void CreateLanguagesDB();
 328     static void DestroyLanguagesDB();
 329
 330 private:
 331     bool DoInit(const wxString& name,
 332                 const wxString& shortName,
 333                 const wxString& locale);
 334
 335     // copy default table of languages from global static array to
 336     // m_langugagesInfo, called by InitLanguagesDB
 337     static void InitLanguagesDB();
 338
 339     // initialize the member fields to default values
 340     void DoCommonInit();
 341
 342     wxString       m_strLocale,       // this locale name
 343                    m_strShort;        // short name for the locale
 344     int            m_language;        // this locale wxLanguage value
 345
 346     const char  *m_pszOldLocale;      // previous locale from setlocale()
 347     wxLocale      *m_pOldLocale;      // previous wxLocale
 348
 349     bool           m_initialized;
 350
 351     wxTranslations m_translations;
 352
 353     static wxLanguageInfoArray *ms_languagesDB;
 354
 355     wxDECLARE_NO_COPY_CLASS(wxLocale);
 356 };
 357
 358 // ----------------------------------------------------------------------------
 359 // global functions
 360 // ----------------------------------------------------------------------------
 361
 362 // get the current locale object (note that it may be NULL!)
 363 extern WXDLLIMPEXP_BASE wxLocale* wxGetLocale();
 364
 365 #endif // wxUSE_INTL
 366
 367 #endif // _WX_INTL_H_