Method loadBuffer

tutorials/external/catch.hpp:6977–7006

        std::vector<Token> m_tokenBuffer;

        void loadBuffer() {
            m_tokenBuffer.resize( 0 );

            // Skip any empty strings
            while( it != itEnd && it->empty() )
                ++it;

            if( it != itEnd ) {
                auto const &next = *it;
                if( isOptPrefix( next[0] ) ) {
                    auto delimiterPos = next.find_first_of( " :=" );
                    if( delimiterPos != std::string::npos ) {
                        m_tokenBuffer.push_back( { TokenType::Option, next.substr( 0, delimiterPos ) } );
                        m_tokenBuffer.push_back( { TokenType::Argument, next.substr( delimiterPos + 1 ) } );
                    } else {
                        if( next[1] != '-' && next.size() > 2 ) {
                            std::string opt = "- ";
                            for( size_t i = 1; i < next.size(); ++i ) {
                                opt[1] = next[i];
                                m_tokenBuffer.push_back( { TokenType::Option, opt } );
                            }
                        } else {
                            m_tokenBuffer.push_back( { TokenType::Option, next } );
                        }
                    }
                } else {
                    m_tokenBuffer.push_back( { TokenType::Argument, next } );
                }
            }
        }

    public:
        explicit TokenStream( Args const &args ) : TokenStream( args.m_args.begin(), args.m_args.end() ) {}