From 375799fa79d1af76f33299acc20a11a167a021f8 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@gmail.com>
Date: Thu, 17 Aug 2023 12:32:50 +0200
Subject: project: restructure libraries and build env

---
 source/lib/proto/src/message.cpp | 82 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 source/lib/proto/src/message.cpp

(limited to 'source/lib/proto/src/message.cpp')

diff --git a/source/lib/proto/src/message.cpp b/source/lib/proto/src/message.cpp
new file mode 100644
index 0000000..dad3e86
--- /dev/null
+++ b/source/lib/proto/src/message.cpp
@@ -0,0 +1,82 @@
+#include "wanda/proto/message.hpp"
+
+#include <fmt/format.h>
+
+#include <ios>
+#include <iterator>
+#include <sstream>
+
+namespace wanda::proto
+{
+  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::proto
+
+auto fmt::formatter<wanda::proto::message>::format(wanda::proto::message const & message, format_context & context) const -> decltype(context.out())
+{
+  return formatter<std::string>::format(static_cast<std::string>(message), context);
+}
-- 
cgit v1.2.3