audacia/libraries/lib-strings/TranslatableString.cpp

/**********************************************************************
 
 Audacity: A Digital Audio Editor
 
 @file TranslatableString.cpp
 
 Paul Licameli split from Internat.cpp
 
 **********************************************************************/

#include "TranslatableString.h"
#include "Identifier.h"
#include <wx/translation.h>

const wxChar *const TranslatableString::NullContextName = wxT("*");

Identifier TranslatableString::MSGID() const
{
   return Identifier{ mMsgid };
}

const TranslatableString::Formatter
TranslatableString::NullContextFormatter {
   [](const wxString & str, TranslatableString::Request request) -> wxString {
      switch ( request ) {
         case Request::Context:
            return NullContextName;
         case Request::Format:
         case Request::DebugFormat:
         default:
            return str;
      }
   }
};

bool TranslatableString::IsVerbatim() const
{
   return DoGetContext( mFormatter ) == NullContextName;
}

TranslatableString &TranslatableString::Strip( unsigned codes ) &
{
   auto prevFormatter = mFormatter;
   mFormatter = [prevFormatter, codes]
   ( const wxString & str, TranslatableString::Request request ) -> wxString {
      switch ( request ) {
         case Request::Context:
            return TranslatableString::DoGetContext( prevFormatter );
         case Request::Format:
         case Request::DebugFormat:
         default: {
            bool debug = request == Request::DebugFormat;
            auto result =
               TranslatableString::DoSubstitute(
                  prevFormatter,
                  str, TranslatableString::DoGetContext( prevFormatter ),
                  debug );
            if ( codes & MenuCodes ) {
               // Don't use this, it's in wxCore
               // result = wxStripMenuCodes( result );
               decltype( result ) temp;
               temp.swap(result);
               for ( auto iter = temp.begin(), end = temp.end();
                    iter != end; ++iter ) {
                  // Stop at trailing hot key name
                  if ( *iter == '\t' )
                     break;
                  // Strip & (unless escaped by another preceding &)
                  if ( *iter == '&' && ++iter == end )
                     break;
                  result.append( 1, *iter );
               }
            }
            if ( codes & Ellipses ) {
               if (result.EndsWith(wxT("...")))
                  result = result.Left( result.length() - 3 );
               // Also check for the single-character Unicode ellipsis
               else if (result.EndsWith(wxT("\u2026")))
                  result = result.Left( result.length() - 1 );
            }
            return result;
         }
      }
   };
   
   return *this;
}

wxString TranslatableString::DoGetContext( const Formatter &formatter )
{
   return formatter ? formatter( {}, Request::Context ) : wxString{};
}

wxString TranslatableString::DoSubstitute( const Formatter &formatter,
   const wxString &format, const wxString &context, bool debug )
{
   return formatter
      ? formatter( format, debug ? Request::DebugFormat : Request::Format )
      : // come here for most translatable strings, which have no formatting
         ( debug ? format : wxGetTranslation( format, wxString{}, context ) );
}

wxString TranslatableString::DoChooseFormat(
   const Formatter &formatter,
   const wxString &singular, const wxString &plural, unsigned nn, bool debug )
{
   // come here for translatable strings that choose among forms by number;
   // if not debugging, then two keys are passed to an overload of
   // wxGetTranslation, and also a number.
   // Some languages might choose among more or fewer than two forms
   // (e.g. Arabic has duals and Russian has complicated declension rules)
   wxString context;
   return ( debug || NullContextName == (context = DoGetContext(formatter)) )
      ? ( nn == 1 ? singular : plural )
      : wxGetTranslation(
            singular, plural, nn
#if HAS_I18N_CONTEXTS
            , wxString{} // domain
            , context
#endif
         );
}

TranslatableString &TranslatableString::Join(
   const TranslatableString arg, const wxString &separator ) &
{
   auto prevFormatter = mFormatter;
   mFormatter =
   [prevFormatter,
    arg /* = std::move( arg ) */,
    separator](const wxString &str, Request request)
      -> wxString {
      switch ( request ) {
         case Request::Context:
            return TranslatableString::DoGetContext( prevFormatter );
         case Request::Format:
         case Request::DebugFormat:
         default: {
            bool debug = request == Request::DebugFormat;
            return
               TranslatableString::DoSubstitute( prevFormatter,
                  str, TranslatableString::DoGetContext( prevFormatter ),
                  debug )
                  + separator
                  + arg.DoFormat( debug );
         }
      }
   };
   return *this;
}

const TranslatableString TranslatableString::Inaudible{ wxT("\a") };