Work on modularizing files

src/ifcgeom/schema/IfcMappedItem.cpp

@@ -0,0 +1,32 @@
+#include "mapping.h"
+#define mapping POSTFIX_SCHEMA(mapping)
+using namespace ifcopenshell::geometry;
+
+taxonomy::item* mapping::map_impl(const IfcSchema::IfcMappedItem* inst) {
+	IfcSchema::IfcCartesianTransformationOperator* transform = inst->MappingTarget();
+	taxonomy::matrix4 gtrsf = as<taxonomy::matrix4>(map(transform));
+	IfcSchema::IfcRepresentationMap* rmap = inst->MappingSource();
+	IfcSchema::IfcAxis2Placement* placement = rmap->MappingOrigin();
+	taxonomy::matrix4 trsf2 = as<taxonomy::matrix4>(map(placement));
+	// Cannot be nullptr here
+	*gtrsf.components_ = *gtrsf.components_ * *trsf2.components_;
+	
+	// @todo immutable for caching?
+	// @todo allow for multiple levels of matrix?
+	auto shapes = map(rmap->MappedRepresentation());
+	if (shapes == nullptr) {
+		return shapes;
+	}
+
+	auto collection = new taxonomy::collection;
+	collection->children.push_back(shapes);
+	collection->matrix = *gtrsf.components_;
+
+	if (shapes != nullptr) {
+		for (auto& c : ((taxonomy::collection*)shapes)->children) {
+			// @todo previously style was also copied.
+		}
+	}
+
+	return collection;
+}