ircd::json: Improve stringification interface et al.

include/ircd/json.h

@@ -83,6 +83,11 @@ namespace ircd::json
 
 	using path = std::initializer_list<string_view>;
 	std::ostream &operator<<(std::ostream &, const path &);
+
+	size_t serialized(const string_view &);
+	template<class... T> string_view stringify(const mutable_buffer &&mb, T&&... t);
+	template<class... T> size_t print(char *const &buf, const size_t &max, T&&... t);
+	template<class... T> std::string string(T&&... t);
 }
 
 #include "json/array.h"
@@ -99,6 +104,55 @@ namespace ircd
 	using json::operator<<;
 }
 
+//
+// Convenience template for const rvalue mutable_buffers or basically
+// allowing a bracket initialization of a mutable_buffer in the argument
+// to stringify()
+//
+template<class... T>
+ircd::string_view
+ircd::json::stringify(const mutable_buffer &&mb,
+                      T&&... t)
+{
+	mutable_buffer mbc(mb);
+	return stringify(mbc, std::forward<T>(t)...);
+}
+
+//
+// Convenience template using the syntax print(buf, sizeof(buf), ...)
+// which stringifies with null termination into buffer.
+//
+template<class... T>
+size_t
+ircd::json::print(char *const &buf,
+                  const size_t &max,
+                  T&&... t)
+{
+	if(!max)
+		return 0;
+
+	mutable_buffer mb{buf, max - 1};
+	const auto sv(stringify(mb, std::forward<T>(t)...));
+	assert(sv.size() < max);
+	buf[sv.size()] = '\0';
+	return sv.size();
+}
+
+//
+// Convenience template using the syntax string(...) which returns
+// an std::string of the printed JSON
+//
+template<class... T>
+std::string
+ircd::json::string(T&&... t)
+{
+	std::string ret;
+	ret.resize(serialized(std::forward<T>(t)...), char{});
+	const auto buf{const_cast<char *>(ret.data())};
+	print(buf, ret.size() + 1, std::forward<T>(t)...);
+	return ret;
+}
+
 inline std::ostream &
 ircd::json::operator<<(std::ostream &s, const path &p)
 {

include/ircd/json/array.h

@@ -57,8 +57,7 @@ struct ircd::json::array
 
 	using string_view::string_view;
 
-	friend array serialize(const array &, char *&buf, char *const &stop);
+	friend string_view stringify(mutable_buffer &, const array &);
-	friend size_t print(char *const &buf, const size_t &max, const array &);
 	friend std::ostream &operator<<(std::ostream &, const array &);
 };
 

include/ircd/json/builder.h

@@ -47,26 +47,24 @@ struct ircd::json::builder
 	builder(const builder *const &parent, const members *const &);
 	builder(const builder *const &parent, member);
 
-	friend string_view stringify(char *const &buf, const size_t &max, const builder &);
+	friend string_view stringify(mutable_buffer &, const builder &);
 };
 
 inline ircd::string_view
-ircd::json::stringify(char *const &buf,
+ircd::json::stringify(mutable_buffer &head,
-                      const size_t &max,
                       const builder &builder)
 {
-	size_t i(0);
+	const auto num{builder.count()};
-	const auto num(builder.count());
 	const member *m[num];
+
+	size_t i(0);
 	builder.for_each([&i, &m]
 	(const auto &member)
 	{
 		m[i++] = &member;
 	});
 
-	char *p(buf);
+	return stringify(head, m, m + num);
-	char *const e(buf + max);
-	return serialize(m, m + num, p, e);
 }
 
 inline

include/ircd/json/index.h

@@ -44,7 +44,7 @@ struct ircd::json::index
 
 	bool empty() const;
 	size_t count() const;
-	size_t size() const;
+	size_t serialized() const;
 
 	const_iterator find(const string_view &name) const;
 	bool has(const string_view &name) const;
@@ -70,8 +70,8 @@ struct ircd::json::index
 	friend index &operator+=(index &, const object &);      // integration
 	friend index operator+(const object &, const object &);  // integral
 
-	friend object serialize(const index &, char *&start, char *const &stop);
+	friend size_t serialized(const index &);
-	friend size_t print(char *const &buf, const size_t &max, const index &);
+	friend string_view stringify(mutable_buffer &, const index &);
 	friend std::ostream &operator<<(std::ostream &, const index &);
 };
 

include/ircd/json/member.h

@@ -34,20 +34,16 @@
 namespace ircd::json
 {
 	struct member;
-
-	size_t size(const member *const &begin, const member *const &end);
-	object serialize(const member *const *const &begin, const member *const *const &end, char *&start, char *const &stop);
-	object serialize(const member *const &begin, const member *const &end, char *&start, char *const &stop);
-	size_t print(char *const &buf, const size_t &max, const member *const &begin, const member *const &end);
-	std::string string(const member *const &begin, const member *const &end);
-
 	using members = std::initializer_list<member>;
-	object serialize(const members &, char *&start, char *const &stop);
-	size_t print(char *const &buf, const size_t &max, const members &);
-	std::string string(const members &);
 
-	array serialize(const std::vector<json::object> &, char *&start, char *const &stop);
+	size_t serialized(const member *const &begin, const member *const &end);
-	string_view stringify(char *const &buf, const size_t &max, const members &);
+	size_t serialized(const members &);
+
+	string_view stringify(mutable_buffer &, const member *const *const &begin, const member *const *const &end);
+	string_view stringify(mutable_buffer &, const member *const &begin, const member *const &end);
+	string_view stringify(mutable_buffer &, const members &);
+
+	string_view stringify(mutable_buffer &, const std::vector<json::object> &);
 }
 
 struct ircd::json::member
@@ -67,6 +63,8 @@ struct ircd::json::member
 	friend bool operator!=(const member &a, const string_view &b);
 	friend bool operator<(const member &a, const string_view &b);
 
+	friend size_t serialized(const member &);
+	friend string_view stringify(mutable_buffer &, const member &);
 	friend std::ostream &operator<<(std::ostream &, const member &);
 };
 

include/ircd/json/object.h

@@ -111,9 +111,8 @@ struct ircd::json::object
 	explicit operator std::string() const;
 
 	// rewrite onto streams or buffers etc
+	friend string_view stringify(mutable_buffer &, const object &);
 	friend std::ostream &operator<<(std::ostream &, const object &);
-	friend object serialize(const object &, char *&buf, char *const &stop);
-	friend size_t print(char *const &buf, const size_t &max, const object &);
 };
 
 struct ircd::json::object::member
@@ -131,6 +130,7 @@ struct ircd::json::object::member
 	friend bool operator>(const member &, const member &);
 
 	// writes a single member onto stream
+	friend string_view stringify(mutable_buffer &, const object::member &);
 	friend std::ostream &operator<<(std::ostream &, const object::member &);
 };
 

include/ircd/json/tuple.h

@@ -596,6 +596,22 @@ tuple<T...>::tuple(const std::initializer_list<member> &members)
 	});
 }
 
+template<class tuple,
+         class it_a,
+         class it_b,
+         class closure>
+constexpr void
+_key_transform(it_a it,
+               const it_b end,
+               closure&& lambda)
+{
+	for(size_t i(0); i < tuple::size() && it != end; ++i)
+	{
+		*it = lambda(key<tuple, i>());
+		++it;
+	}
+}
+
 template<class tuple,
          class it_a,
          class it_b>
@@ -603,11 +619,8 @@ constexpr void
 _key_transform(it_a it,
                const it_b end)
 {
-	for(size_t i(0); i < tuple::size(); ++i)
+	for(size_t i(0); i < tuple::size() && it != end; ++i)
 	{
-		if(it == end)
-			break;
-
 		*it = key<tuple, i>();
 		++it;
 	}
@@ -632,6 +645,28 @@ _key_transform(const tuple<T...> &tuple,
 	});
 }
 
+template<class it_a,
+         class it_b,
+         class closure,
+         class... T>
+void
+_member_transform(const tuple<T...> &tuple,
+                  it_a it,
+                  const it_b end,
+                  closure&& lambda)
+{
+	until(tuple, [&it, &end, &lambda]
+	(const auto &key, const auto &val)
+	{
+		if(it == end)
+			return false;
+
+		*it = lambda(key, val);
+		++it;
+		return true;
+	});
+}
+
 template<class it_a,
          class it_b,
          class... T>
@@ -640,46 +675,73 @@ _member_transform(const tuple<T...> &tuple,
                   it_a it,
                   const it_b end)
 {
-	for_each(tuple, [&it, &end]
+	until(tuple, [&it, &end]
 	(const auto &key, const auto &val)
 	{
-		if(it != end)
+		if(it == end)
-		{
+			return false;
+
 		*it = { key, val };
 		++it;
-		}
+		return true;
 	});
 }
 
-template<class... T>
+template<class T>
-object
+constexpr bool
-serialize(const tuple<T...> &tuple,
+serialized_lex_cast()
-          char *&start,
-          char *const &stop)
 {
-	std::array<member, tuple.size()> members;
+	using type = typename std::remove_reference<T>::type;
-	_member_transform(tuple, begin(members), end(members));
+	return std::is_arithmetic<type>::value;
-	return serialize(begin(members), end(members), start, stop);
+}
+
+template<class T>
+typename std::enable_if<serialized_lex_cast<T>(), size_t>::type
+serialized(T&& t)
+{
+	return lex_cast(t).size();
 }
 
 template<class... T>
 size_t
-print(char *const &buf,
+serialized(const tuple<T...> &t)
-      const size_t &max,
+{
+	constexpr const size_t member_count
+	{
+		tuple<T...>::size()
+	};
+
+	// Number of commas for this object is one less than the member count, or 0
+	const size_t commas
+	{
+		member_count? member_count - 1 : 0
+	};
+
+	// 2 for the {} and the comma count
+	const size_t overhead
+	{
+		2 + commas
+	};
+
+	std::array<size_t, member_count> sizes;
+	_member_transform(t, begin(sizes), end(sizes), []
+	(const string_view &key, auto&& val)
+	{
+		//     "                "   :
+		return 1 + key.size() + 1 + 1 + serialized(val);
+	});
+
+	return std::accumulate(begin(sizes), end(sizes), overhead);
+}
+
+template<class... T>
+string_view
+stringify(mutable_buffer &buf,
           const tuple<T...> &tuple)
 {
 	std::array<member, tuple.size()> members;
 	_member_transform(tuple, begin(members), end(members));
-	return print(buf, max, begin(members), end(members));
+	return stringify(buf, begin(members), end(members));
-}
-
-template<class... T>
-std::string
-string(const tuple<T...> &tuple)
-{
-	std::array<member, tuple.size()> members;
-	_member_transform(tuple, begin(members), end(members));
-	return string(begin(members), end(members));
 }
 
 template<class... T>

include/ircd/json/value.h

@@ -55,7 +55,7 @@ struct ircd::json::value
 
   public:
 	bool empty() const;
-	size_t size() const;
+	size_t serialized() const;
 	operator string_view() const;
 	explicit operator std::string() const;
 
@@ -80,6 +80,9 @@ struct ircd::json::value
 	friend bool operator>=(const value &a, const value &b);
 	friend bool operator<(const value &a, const value &b);
 	friend bool operator>(const value &a, const value &b);
+
+	friend size_t serialized(const value &);
+	friend string_view stringify(mutable_buffer &, const value &);
 	friend std::ostream &operator<<(std::ostream &, const value &);
 };
 

ircd/json.cc

@@ -248,6 +248,12 @@ struct printer
 	template<class generator>
 	bool operator()(char *&out, char *const &stop, generator&& gen) const;
 
+	template<class... args>
+	bool operator()(mutable_buffer &out, args&&... a) const
+	{
+		return operator()(begin(out), end(out), std::forward<args>(a)...);
+	}
+
 	printer();
 }
 const printer;
@@ -259,23 +265,6 @@ struct ostreamer
 }
 const ostreamer;
 
-size_t print(char *const &buf, const size_t &max, const array &);
-size_t print(char *const &buf, const size_t &max, const object &);
-size_t print(char *const &buf, const size_t &max, const index::member *const &begin, const index::member *const &end);
-size_t print(char *const &buf, const size_t &max, const index &);
-size_t print(char *const &buf, const size_t &max, const members &);
-
-array serialize(const array &, char *&start, char *const &stop);
-object serialize(const object &, char *&start, char *const &stop);
-object serialize(const index::member *const &beg, const index::member *const &end, char *&start, char *const &stop);
-object serialize(const index &, char *&start, char *const &stop);
-object serialize(const members &, char *&start, char *const &stop);
-
-std::ostream &operator<<(std::ostream &, const array &);
-std::ostream &operator<<(std::ostream &, const object::member &);
-std::ostream &operator<<(std::ostream &, const object &);
-std::ostream &operator<<(std::ostream &, const index &);
-
 } // namespace json
 } // namespace ircd
 
@@ -318,18 +307,26 @@ ircd::json::printer::printer()
 {
 	const auto recursor([this](auto &a, auto &b, auto &c)
 	{
-		const auto recurse_array([&]
+		const auto recurse_array([&a]
 		{
-			char *out(const_cast<char *>(a.data()));
+			mutable_buffer mb
-			const auto r(serialize(json::array(a), out, out + a.size()));
+			{
-			a.resize(size_t(out - r.data()));
+				const_cast<char *>(a.data()), a.size()
+			};
+
+			const auto r(stringify(mb, json::array(a)));
+			a.resize(r.size());
 		});
 
-		const auto recurse_object([&]
+		const auto recurse_object([&a]
 		{
-			char *out(const_cast<char *>(a.data()));
+			mutable_buffer mb
-			const auto d(serialize(json::object(a), out, out + a.size()));
+			{
-			a.resize(size_t(out - d.data()));
+				const_cast<char *>(a.data()), a.size()
+			};
+
+			const auto r(stringify(mb, json::object(a)));
+			a.resize(r.size());
 		});
 
 		const auto quote_string([&]
@@ -400,104 +397,20 @@ const
 	return karma::generate(out, gg);
 }
 
-std::string
-ircd::json::string(const members &list)
-{
-	return string(std::begin(list), std::end(list));
-}
-
-std::string
-ircd::json::string(const index::member *const &begin,
-                   const index::member *const &end)
-{
-	std::string ret(size(begin, end), char());
-	print(const_cast<char *>(ret.data()), ret.size() + 1, begin, end);
-	return ret;
-}
-
-size_t
-ircd::json::print(char *const &buf,
-                  const size_t &max,
-                  const index &obj)
-{
-	if(unlikely(!max))
-		return 0;
-
-	char *out(buf);
-	serialize(obj, out, out + (max - 1));
-	*out = '\0';
-	return out - buf;
-}
-
 ircd::string_view
-ircd::json::stringify(char *const &buf,
+ircd::json::stringify(mutable_buffer &buf,
-                      const size_t &max,
+                      const std::vector<json::object> &v)
-                      const members &list)
 {
-	const auto len
+	const auto print_member([&buf](const string_view &elem)
 	{
-		print(buf, max, std::begin(list), std::end(list))
+		//printer(buf, printer.elem, elem);
-	};
+		const auto cpsz(std::min(size(buf), elem.size()));
-
+		memcpy(begin(buf), elem.data(), cpsz);
-	return string_view{buf, len};
+		begin(buf) += cpsz;
-}
-
-size_t
-ircd::json::print(char *const &buf,
-                  const size_t &max,
-                  const members &list)
-{
-	return print(buf, max, std::begin(list), std::end(list));
-}
-
-size_t
-ircd::json::print(char *const &buf,
-                  const size_t &max,
-                  const index::member *const &begin,
-                  const index::member *const &end)
-{
-	if(unlikely(!max))
-		return 0;
-
-	char *out(buf);
-	serialize(begin, end, out, out + (max - 1));
-	*out = '\0';
-	return out - buf;
-}
-
-ircd::json::object
-ircd::json::serialize(const members &list,
-                      char *&out,
-                      char *const &stop)
-{
-	return serialize(std::begin(list), std::end(list), out, stop);
-}
-
-ircd::json::object
-ircd::json::serialize(const index &obj,
-                      char *&out,
-                      char *const &stop)
-{
-	const index::member *const &begin(&obj.idx.front());
-	const index::member *const &end(begin + obj.idx.size());
-	return serialize(begin, end, out, stop);
-}
-
-ircd::json::array
-ircd::json::serialize(const std::vector<json::object> &v,
-                      char *&out,
-                      char *const &stop)
-{
-	const auto print_member([&out, &stop](const string_view &elem)
-	{
-		//printer(out, stop, printer.elem, elem);
-		const auto cpsz(std::min(size_t(stop - out), elem.size()));
-		memcpy(out, elem.data(), cpsz);
-		out += cpsz;
 	});
 
-	char *const start(out);
+	char *const start(begin(buf));
-	printer(out, stop, printer.array_begin);
+	printer(buf, printer.array_begin);
 
 	auto it(std::begin(v));
 	if(it != std::end(v))
@@ -505,66 +418,80 @@ ircd::json::serialize(const std::vector<json::object> &v,
 		print_member(*it);
 		for(++it; it != std::end(v); ++it)
 		{
-			printer(out, stop, printer.value_sep);
+			printer(buf, printer.value_sep);
 			print_member(*it);
 		}
 	}
 
-	printer(out, stop, printer.array_end);
+	printer(buf, printer.array_end);
-	return string_view{start, out};
+	return string_view{start, begin(buf)};
 }
 
-ircd::json::object
+ircd::string_view
-ircd::json::serialize(const index::member *const &begin,
+ircd::json::stringify(mutable_buffer &buf,
-                      const index::member *const &end,
+                      const members &list)
-                      char *&out,
+{
-                      char *const &stop)
+	return stringify(buf, std::begin(list), std::end(list));
+}
+
+ircd::string_view
+ircd::json::stringify(mutable_buffer &buf,
+                      const index &obj)
+{
+	const member *const &begin(&obj.idx.front());
+	const member *const &end(begin + obj.idx.size());
+	return stringify(buf, begin, end);
+}
+
+ircd::string_view
+ircd::json::stringify(mutable_buffer &buf,
+                      const member *const &begin,
+                      const member *const &end)
 {
 	const auto num(std::distance(begin, end));
-	const index::member *vec[num];
+	const member *vec[num];
 	for(auto i(0); i < num; ++i)
 		vec[i] = begin + i;
 
-	return serialize(vec, vec + num, out, stop);
+	return stringify(buf, vec, vec + num);
 }
 
-ircd::json::object
+ircd::string_view
-ircd::json::serialize(const index::member *const *const &begin,
+ircd::json::stringify(mutable_buffer &buf,
-                      const index::member *const *const &end,
+                      const member *const *const &b,
-                      char *&out,
+                      const member *const *const &e)
-                      char *const &stop)
 {
-	const auto print_string([&stop, &out](const value &value)
+	const auto print_string([&buf](const value &value)
 	{
-		printer(out, stop, printer.string, string_view{value});
+		printer(buf, printer.string, string_view{value});
 	});
 
-	const auto print_literal([&stop, &out](const value &value)
+	const auto print_literal([&buf](const value &value)
 	{
-		printer(out, stop, printer.literal, string_view{value});
+		printer(buf, printer.literal, string_view{value});
 	});
 
-	const auto print_object([&stop, &out](const value &value)
+	const auto print_object([&buf](const value &value)
 	{
 		if(value.serial)
 		{
-			printer(out, stop, printer.object, string_view{value});
+			printer(buf, printer.object, string_view{value});
 			return;
 		}
 
 		assert(value.object);
-		serialize(*value.object, out, stop);
+		stringify(buf, *value.object);
 	});
 
-	const auto print_array([&stop, &out](const value &value)
+	const auto print_array([&buf](const value &value)
 	{
 		if(value.serial)
 		{
 			//printer(out, stop, printer.array, value);
 			const string_view data(value);
-			const auto cpsz(std::min(size_t(stop - out), data.size()));
+			const auto cpsz(std::min(size(buf), data.size()));
-			memcpy(out, data.data(), cpsz);
+			memcpy(begin(buf), data.data(), cpsz);
-			out += cpsz;
+			begin(buf) += cpsz;
 			return;
 		}
 
@@ -573,27 +500,27 @@ ircd::json::serialize(const index::member *const *const &begin,
 		//serialize(*value.object, out, stop);
 	});
 
-	const auto print_number([&stop, &out](const value &value)
+	const auto print_number([&buf](const value &value)
 	{
 		if(value.serial)
 		{
 			if(value.floats)
-				printer(out, stop, double_, string_view{value});
+				printer(buf, double_, string_view{value});
 			else
-				printer(out, stop, long_, string_view{value});
+				printer(buf, long_, string_view{value});
 
 			return;
 		}
 
 		if(value.floats)
-			printer(out, stop, double_, value.floating);
+			printer(buf, double_, value.floating);
 		else
-			printer(out, stop, long_, value.integer);
+			printer(buf, long_, value.integer);
 	});
 
-	const auto print_member([&](const index::member &member)
+	const auto print_member([&](const member &member)
 	{
-		printer(out, stop, printer.name << printer.name_sep, member.first);
+		printer(buf, printer.name << printer.name_sep, member.first);
 
 		switch(member.second.type)
 		{
@@ -605,40 +532,48 @@ ircd::json::serialize(const index::member *const *const &begin,
 		}
 	});
 
-	char *const start(out);
+	char *const start(begin(buf));
-	printer(out, stop, printer.object_begin);
+	printer(buf, printer.object_begin);
 
-	auto it(begin);
+	auto it(b);
-	if(it != end)
+	if(it != e)
 	{
 		print_member(**it);
-		for(++it; it != end; ++it)
+		for(++it; it != e; ++it)
 		{
-			printer(out, stop, printer.value_sep);
+			printer(buf, printer.value_sep);
 			print_member(**it);
 		}
 	}
 
-	printer(out, stop, printer.object_end);
+	printer(buf, printer.object_end);
-	return string_view{start, out};
+	return string_view{start, begin(buf)};
 }
 
 ircd::json::ostreamer::ostreamer()
 {
 	const auto recursor([this](auto &a, auto &b, auto &c)
 	{
-		const auto recurse_array([&]
+		const auto recurse_array([&a]
 		{
-			char *out(const_cast<char *>(a.data()));
+			mutable_buffer mb
-			const auto r(serialize(json::array(a), out, out + a.size()));
+			{
-			a.resize(size_t(out - r.data()));
+				const_cast<char *>(a.data()), a.size()
+			};
+
+			const auto r(stringify(mb, json::array(a)));
+			a.resize(r.size());
 		});
 
-		const auto recurse_object([&]
+		const auto recurse_object([&a]
 		{
-			char *out(const_cast<char *>(a.data()));
+			mutable_buffer mb
-			const auto d(serialize(json::object(a), out, out + a.size()));
+			{
-			a.resize(size_t(out - d.data()));
+				const_cast<char *>(a.data()), a.size()
+			};
+
+			const auto r(stringify(mb, json::object(a)));
+			a.resize(r.size());
 		});
 
 		const auto quote_string([&]
@@ -735,7 +670,7 @@ ircd::json::operator<<(std::ostream &s, const index &obj)
 			karma::generate(osi, long_, value.integer);
 	});
 
-	const auto stream_member([&](const index::member &member)
+	const auto stream_member([&](const member &member)
 	{
 		karma::generate(osi, ostreamer.name << ostreamer.name_sep, string_view(member.first));
 
@@ -766,6 +701,30 @@ ircd::json::operator<<(std::ostream &s, const index &obj)
 	return s;
 }
 
+size_t
+ircd::json::serialized(const members &m)
+{
+	return serialized(std::begin(m), std::end(m));
+}
+
+size_t
+ircd::json::serialized(const member *const &begin,
+                       const member *const &end)
+{
+	const size_t ret(1 + !std::distance(begin, end));
+	return std::accumulate(begin, end, ret, []
+	(auto ret, const auto &member)
+	{
+		return ret += serialized(member) + 1;
+	});
+}
+
+size_t
+ircd::json::serialized(const member &member)
+{
+	return serialized(member.first) + 1 + 1 + serialized(member.second);
+}
+
 ircd::json::index
 ircd::json::operator+(const object &left, const object &right)
 {
@@ -794,7 +753,7 @@ ircd::json::operator+=(index &left, const object &right)
 			if(deletion)   // prevents adding the empty indicator as the new key!
 				continue;
 
-			left.idx.emplace_back(index::member{b});
+			left.idx.emplace_back(member{b});
 			continue;
 		}
 
@@ -804,12 +763,12 @@ ircd::json::operator+=(index &left, const object &right)
 			continue;
 		}
 
-		auto &a(const_cast<index::member &>(*it));
+		auto &a(const_cast<member &>(*it));
 		switch(type(a.second))
 		{
 			default:
 			{
-				a = index::member{b};
+				a = member{b};
 				continue;
 			}
 
@@ -825,7 +784,7 @@ ircd::json::operator+=(index &left, const object &right)
 					continue;
 				}
 
-				a = index::member{string_view{a.first}, std::move(merged)};
+				a = member{string_view{a.first}, std::move(merged)};
 				continue;
 			}
 		}
@@ -839,15 +798,15 @@ ircd::json::index::index(recursive_t recursive,
 :idx{object.count()}
 {
 	std::transform(std::begin(object), std::end(object), std::begin(idx), [&]
-	(const object::member &m) -> index::member
+	(const object::member &m) -> member
 	{
 		switch(type(m.second))
 		{
 			case OBJECT:
-				return index::member{m.first, std::make_unique<index>(recursive, m.second)};
+				return member{m.first, std::make_unique<index>(recursive, m.second)};
 
 			default:
-				return index::member{m};
+				return member{m};
 		};
 	});
 }
@@ -856,9 +815,9 @@ ircd::json::index::index(const object &object)
 :idx{object.count()}
 {
 	std::transform(std::begin(object), std::end(object), std::begin(idx), []
-	(const object::member &m) -> index::member
+	(const object::member &m) -> member
 	{
-		return index::member{m};
+		return member{m};
 	});
 }
 
@@ -945,35 +904,26 @@ const
 }
 
 size_t
-ircd::json::size(const index::member *const &begin,
+ircd::json::serialized(const index &index)
-                 const index::member *const &end)
 {
-	const size_t ret(1 + !std::distance(begin, end));
+	return index.serialized();
-	return std::accumulate(begin, end, ret, []
-	(auto ret, const auto &member)
-	{
-		return ret += member.first.size() + 1 + 1 + member.second.size() + 1;
-	});
 }
 
 size_t
-ircd::json::index::size()
+ircd::json::index::serialized()
 const
 {
-	const size_t ret(1 + idx.empty());
+	const member *const &begin(&idx.front());
-	return std::accumulate(std::begin(idx), std::end(idx), ret, []
+	const member *const &end(begin + idx.size());
-	(auto ret, const auto &member)
+	return json::serialized(begin, end);
-	{
-		return ret += member.first.size() + 1 + 1 + member.second.size() + 1;
-	});
 }
 
 ircd::json::index::operator std::string()
 const
 {
-	std::string ret(size(), char());
+	const member *const &begin(&idx.front());
-	ret.resize(print(const_cast<char *>(ret.data()), ret.size() + 1, *this));
+	const member *const &end(begin + idx.size());
-	return ret;
+	return json::string(begin, end);
 }
 
 ircd::json::value::~value()
@@ -1059,14 +1009,20 @@ const
 }
 
 size_t
-ircd::json::value::size()
+ircd::json::serialized(const value &value)
+{
+	return value.serialized();
+}
+
+size_t
+ircd::json::value::serialized()
 const
 {
 	switch(type)
 	{
 		case NUMBER:   return lex_cast(integer).size();
 		case STRING:   return 1 + len + 1;
-		case OBJECT:   return serial? len : object->size();
+		case OBJECT:   return serial? len : object->serialized();
 		case ARRAY:    return serial? len : 2;
 		case LITERAL:  return len;
 	};
@@ -1165,33 +1121,22 @@ ircd::json::operator==(const value &a, const value &b)
     return static_cast<string_view>(a) == static_cast<string_view>(b);
 }
 
-size_t
+ircd::string_view
-ircd::json::print(char *const &buf,
+ircd::json::stringify(mutable_buffer &buf,
-                  const size_t &max,
                       const object &object)
-{
-	if(unlikely(!max))
-		return 0;
-
-	char *out(buf);
-	serialize(object, out, out + (max - 1));
-	*out = '\0';
-	return std::distance(buf, out);
-}
-
-ircd::json::object
-ircd::json::serialize(const object &object,
-                      char *&out,
-                      char *const &stop)
 {
 	static const auto throws([]
 	{
 		throw print_error("The JSON generator failed to print object");
 	});
 
-	char *const start(out);
+	char *const start(begin(buf));
-	karma::generate(out, maxwidth(stop - start)[printer.object] | eps[throws], object);
+	karma::generate(begin(buf), maxwidth(size(buf))[printer.object] | eps[throws], object);
-	return string_view{start, out};
+
+	return string_view
+	{
+		start, begin(buf)
+	};
 }
 
 std::ostream &
@@ -1279,43 +1224,28 @@ const
 	return { string_view::end(), string_view::end() };
 }
 
-size_t
+ircd::string_view
-ircd::json::print(char *const &buf,
+ircd::json::stringify(mutable_buffer &b,
-                  const size_t &max,
+                      const array &a)
-                  const array &arr)
-{
-	if(unlikely(!max))
-		return 0;
-
-	char *out(buf);
-	serialize(arr, out, out + (max - 1));
-	*out = '\0';
-	return std::distance(buf, out);
-}
-
-ircd::json::array
-ircd::json::serialize(const array &a,
-                      char *&out,
-                      char *const &stop)
 {
 	static const auto throws([]
 	{
 		throw print_error("The JSON generator failed to print array");
 	});
 
-	char *const start(out);
+	char *const start(begin(b));
-	karma::generate(out, maxwidth(stop - out)[printer.array_begin] | eps[throws]);
+	karma::generate(begin(b), maxwidth(size(b))[printer.array_begin] | eps[throws]);
 
 	auto it(begin(a));
 	if(it != end(a))
 	{
-		karma::generate(out, maxwidth(stop - out)[printer.elem] | eps[throws], *it);
+		karma::generate(begin(b), maxwidth(size(b))[printer.elem] | eps[throws], *it);
 		for(++it; it != end(a); ++it)
-			karma::generate(out, maxwidth(stop - out)[printer.value_sep << printer.elem] | eps[throws], *it);
+			karma::generate(begin(b), maxwidth(size(b))[printer.value_sep << printer.elem] | eps[throws], *it);
 	}
 
-	karma::generate(out, maxwidth(stop - out)[printer.array_end] | eps[throws]);
+	karma::generate(begin(b), maxwidth(size(b))[printer.array_end] | eps[throws]);
-	return string_view{start, out};
+	return string_view{start, begin(b)};
 }
 
 std::ostream &
@@ -1389,6 +1319,27 @@ const
 	return { string_view::end(), string_view::end() };
 }
 
+size_t
+ircd::json::serialized(const string_view &s)
+{
+	switch(type(s, std::nothrow))
+	{
+		case NUMBER:
+		case OBJECT:
+		case ARRAY:
+		case LITERAL:
+			return s.size();
+
+		case STRING:
+			break;
+	}
+
+	size_t ret(s.size());
+	ret += !startswith(s, '"');
+	ret += !endswith(s, '"');
+	return ret;
+}
+
 enum ircd::json::type
 ircd::json::type(const string_view &buf)
 {

ircd/matrix.cc

@@ -99,11 +99,11 @@ ircd::m::init::init()
 
 	modules.emplace("root.so"s, "root.so"s);
 
+	//TODO: conf obviously
 	listener = new ircd::listener
 	{
-		//TODO: conf obviously
+		json::string(json::members
-		json::string
+		{
-		({
 			{ "name", "Chat Matrix" },
 			{ "host", "0.0.0.0" },
 			{ "port", 8447 },
@@ -141,7 +141,7 @@ ircd::m::bootstrap()
 		const auto type{"m.room.create"};
 
 		char content[512];
-		json::print(content, sizeof(content),
+		print(content, sizeof(content), json::members
 		{
             { "creator", user_id },
 		});
@@ -162,7 +162,7 @@ ircd::m::bootstrap()
 		const auto type{"m.room.member"};
 
 		char content[512];
-		json::print(content, sizeof(content),
+		print(content, sizeof(content), json::members
 		{
             { "membership",     "join"     },
 		});
@@ -438,7 +438,7 @@ ircd::m::room::membership(const m::id::user &user_id,
 		{ "type",         "m.room.member"                               },
 		{ "state_key",    user_id                                       },
 		{ "sender",       user_id                                       },
-		{ "content",      json::stringify(cbuf, sizeof(cbuf), content)  }
+		{ "content",      stringify(cbuf, content)  }
 	});
 }
 

ircd/resource.cc

@@ -257,8 +257,13 @@ ircd::resource::response::response(client &client,
                                    const http::code &code)
 try
 {
-	char cbuf[8192], *out(cbuf);
+	char cbuf[8192];
-	const auto object(serialize(index, out, cbuf + sizeof(cbuf)));
+	mutable_buffer buf{cbuf};
+	const json::object object
+	{
+		stringify(buf, index)
+	};
+
 	response(client, object, code);
 }
 catch(const json::error &e)