Add vehicle graph core: .vhg loader, logic and cab blocks, -graph-run and -graph-catalog

vehicle/graph/graph_block.cpp

@@ -0,0 +1,49 @@
+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#include "stdafx.h"
+#include "vehicle/graph/graph_block.h"
+#include "vehicle/graph/graph_catalog.h"
+
+namespace vgraph
+{
+
+block::block(block_setup const &Setup) : m_type(Setup.type), m_slots(Setup.slots) {}
+
+double block::number(block_setup const &Setup, std::size_t const Param)
+{
+	return Setup.params[Param].number;
+}
+
+bool block::boolean(block_setup const &Setup, std::size_t const Param)
+{
+	return Setup.params[Param].boolean;
+}
+
+std::string const &block::text(block_setup const &Setup, std::size_t const Param)
+{
+	return Setup.params[Param].text;
+}
+
+int block::choice(block_setup const &Setup, std::size_t const Param)
+{
+	auto const &choices{Setup.type.params[Param].choices};
+	auto const &value{Setup.params[Param].text};
+	for (std::size_t idx = 0; idx < choices.size(); ++idx)
+	{
+		if (choices[idx] == value)
+		{
+			return static_cast<int>(idx);
+		}
+	}
+	// the loader rejects values outside of the list, so this only happens with a broken catalog
+	return 0;
+}
+
+} // namespace vgraph