Method loadBuffer

tests/catch.hpp:10280–10320

	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)