From 71c5280bc6393669777147b5036dc510e74d93c4 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 17 Apr 2021 21:41:26 +0100
Subject: Second swing persistance

Mostly functional JSON deserialising for most types.
---
 lib/persistance.cpp | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 lib/persistance.cpp

(limited to 'lib/persistance.cpp')

diff --git a/lib/persistance.cpp b/lib/persistance.cpp
new file mode 100644
index 0000000..7539b44
--- /dev/null
+++ b/lib/persistance.cpp
@@ -0,0 +1,74 @@
+#include "persistance.h"
+#include <map>
+
+namespace Persistanace {
+	using NamedTypeFactories = std::map<std::string_view, std::function<std::unique_ptr<Persistable>()>>;
+	static NamedTypeFactories namedTypeFactories;
+
+	void
+	Persistable::addFactory(const std::string_view t, std::function<std::unique_ptr<Persistable>()> f)
+	{
+		namedTypeFactories.emplace(t, std::move(f));
+	}
+
+	std::unique_ptr<Persistable>
+	Persistable::callFactory(const std::string_view t)
+	{
+		return namedTypeFactories.at(t)();
+	}
+
+	void
+	Selection::operator()(float &)
+	{
+		throw std::runtime_error("Unexpected float");
+	}
+
+	void
+	Selection::operator()(bool &)
+	{
+		throw std::runtime_error("Unexpected bool");
+	}
+
+	void
+	Selection::operator()(const std::nullptr_t &)
+	{
+		throw std::runtime_error("Unexpected null");
+	}
+
+	void
+	Selection::operator()(std::string &)
+	{
+		throw std::runtime_error("Unexpected string");
+	}
+
+	void
+	Selection::BeginArray(Stack &)
+	{
+		throw std::runtime_error("Unexpected array");
+	}
+
+	SelectionPtr
+	Selection::BeginObject()
+	{
+		throw std::runtime_error("Unexpected object");
+	}
+
+	void
+	Selection::beforeValue(Stack &)
+	{
+		throw std::runtime_error("Unexpected value");
+	}
+
+	SelectionPtr
+	Selection::select(const std::string &)
+	{
+		throw std::runtime_error("Unexpected persist");
+	}
+
+	static_assert(!SelectionT<float>::ArrayLike);
+	static_assert(!SelectionT<bool>::ArrayLike);
+	static_assert(!SelectionT<std::string>::ArrayLike);
+	static_assert(SelectionT<std::vector<float>>::ArrayLike);
+	static_assert(SelectionT<glm::vec3>::ArrayLike);
+	static_assert(SelectionT<std::vector<glm::vec3>>::ArrayLike);
+}
-- 
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