StringV.h

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#ifndef ZYPP_BASE_STRINGV_H
#define ZYPP_BASE_STRINGV_H
#include <string_view>
#ifdef __cpp_lib_string_view
 
#include <zypp/base/String.h>
#include <zypp/base/Regex.h>
#include <zypp/base/Flags.h>
 
namespace zypp
{
  namespace strv
  {
    using regex = str::regex;
    using smatch = str::smatch;
 
    enum class Trim {
      notrim = 0,
      right  = 1<<0,
      left   = 1<<1,
      trim   = (left|right),
    };
 
    ZYPP_DECLARE_FLAGS_AND_OPERATORS( TrimFlag, Trim );
 
    namespace detail
    {
      using WordConsumer = std::function<bool(std::string_view,unsigned,bool)>;
 
      template <typename Callable, std::enable_if_t<
      std::is_invocable_r_v<bool,Callable,std::string_view,unsigned,bool>
      , bool> = true>
      WordConsumer wordConsumer( Callable && fnc_r )
      { return std::forward<Callable>(fnc_r); }
      template <typename Callable, std::enable_if_t<
      ! std::is_invocable_r_v<bool,Callable,std::string_view,unsigned,bool>
      && std::is_invocable_r_v<void,Callable,std::string_view,unsigned,bool>
      , bool> = true>
      WordConsumer wordConsumer( Callable && fnc_r )
      { return [&fnc_r](std::string_view a1,unsigned a2,bool a3)->bool { fnc_r(a1,a2,a3); return true; }; }
 
      template <typename Callable, std::enable_if_t<
      std::is_invocable_r_v<bool,Callable,std::string_view,unsigned>
      , bool> = true>
      WordConsumer wordConsumer( Callable && fnc_r )
      { return [&fnc_r](std::string_view a1,unsigned a2,bool)->bool { return fnc_r(a1,a2); }; }
      template <typename Callable, std::enable_if_t<
      ! std::is_invocable_r_v<bool,Callable,std::string_view,unsigned>
      && std::is_invocable_r_v<void,Callable,std::string_view,unsigned>
      , bool> = true>
      WordConsumer wordConsumer( Callable && fnc_r )
      { return [&fnc_r](std::string_view a1,unsigned a2,bool)->bool { fnc_r(a1,a2); return true; }; }
 
      template <typename Callable, std::enable_if_t<
      std::is_invocable_r_v<bool,Callable,std::string_view>
      , bool> = true>
      WordConsumer wordConsumer( Callable && fnc_r )
      { return [&fnc_r](std::string_view a1,unsigned,bool)->bool { return fnc_r(a1); }; }
      template <typename Callable, std::enable_if_t<
      ! std::is_invocable_r_v<bool,Callable,std::string_view>
      && std::is_invocable_r_v<void,Callable,std::string_view>
      , bool> = true>
      WordConsumer wordConsumer( Callable && fnc_r )
      { return [&fnc_r](std::string_view a1,unsigned,bool)->bool { fnc_r(a1); return true; }; }
 
      template <typename Callable, std::enable_if_t<
      std::is_invocable_r_v<bool,Callable>
      , bool> = true>
      WordConsumer wordConsumer( Callable && fnc_r )
      { return [&fnc_r](std::string_view,unsigned,bool)->bool { return fnc_r(); }; }
      template <typename Callable, std::enable_if_t<
      ! std::is_invocable_r_v<bool,Callable>
      && std::is_invocable_r_v<void,Callable>
      , bool> = true>
      WordConsumer wordConsumer( Callable && fnc_r )
      { return [&fnc_r](std::string_view,unsigned,bool)->bool { fnc_r(); return true; }; }
 
      unsigned _splitRx( const std::string & line_r, const regex & rx_r, WordConsumer && fnc_r );
    }  // namespace detail
 
    template <typename Callable = detail::WordConsumer>
    unsigned splitRx( const std::string & line_r, const regex & rx_r, Callable && fnc_r = Callable() )
    { return detail::_splitRx( line_r, rx_r, detail::wordConsumer( std::forward<Callable>(fnc_r) ) ); }
 
 
    unsigned split( std::string_view line_r, std::string_view sep_r, Trim trim_r,
                    std::function<void(std::string_view)> fnc_r );
 
    inline unsigned split( std::string_view line_r, std::string_view sep_r,
                    std::function<void(std::string_view)> fnc_r )
    { return split( line_r, sep_r, Trim::notrim, fnc_r ); }
 
    inline unsigned split( std::string_view line_r,
                    std::function<void(std::string_view)> fnc_r )
    { return split( line_r, std::string_view(), Trim::notrim, fnc_r ); }
 
  } // namespace strv
} // namespace zypp
#endif // __cpp_lib_string_view
#endif // ZYPP_BASE_STRINGV_H