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#include <wanda/message.hpp>
#include <ios>
#include <iterator>
#include <sstream>
namespace wanda
{
message::operator std::string() const
{
std::ostringstream buffer{};
buffer << source
<< ':'
<< command;
if (argument.has_value())
{
buffer << ':' << *argument;
}
return buffer.str();
}
std::size_t message::size() const
{
return static_cast<std::string>(*this).size();
}
template<typename InputIt, typename OutputIt, typename UnaryPredicate>
OutputIt copy_until(InputIt first, InputIt last, OutputIt out, UnaryPredicate predicate)
{
while (first != last && !predicate(*first))
{
*out++ = *first++;
}
return out;
}
std::istream & operator>>(std::istream & in, message & message)
{
auto pos = std::istream_iterator<char>{in};
auto end = std::istream_iterator<char>{};
auto buffer = std::string{};
copy_until(pos, end, std::back_inserter(buffer), [](auto const & c) { return c == ':'; });
if (in.eof() || buffer.size() != 1)
{
in.setstate(std::ios_base::failbit);
return in;
}
message.source = buffer;
buffer.clear();
copy_until(++pos, end, std::back_inserter(buffer), [](auto const & c) { return c == ':'; });
if (in.eof())
{
in.setstate(std::ios_base::failbit);
}
message.command = buffer;
buffer.clear();
copy(++pos, end, std::back_inserter(buffer));
if (buffer.size())
{
message.argument = std::optional{std::move(buffer)};
}
in.clear(in.rdstate() ^ std::ios_base::failbit);
return in;
}
std::ostream & operator<<(std::ostream & out, message const & message)
{
return out << static_cast<std::string>(message);
}
} // namespace wanda
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