First slice plug-in refactor

src/ifcparse/schema.h

@@ -21,11 +21,13 @@
 #define IFCSCHEMA_H
 
 #include "exception.h"
+#include "../plugin/plugin.h"
 
 #include <algorithm>
 #include <boost/algorithm/string.hpp>
 #include <cctype>
 #include <iterator>
+#include <map>
 #include <string>
 #include <vector>
 #include <optional>
@@ -497,6 +499,30 @@ class IFC_PARSE_API schema_definition {
     const std::string& name() const { return name_; }
 };
 
+class IFC_PARSE_API schema_registry {
+  public:
+    typedef const schema_definition& (*get_schema_fn)();
+    typedef void (*clear_schema_fn)();
+
+    void bind(const std::string& schema_name, get_schema_fn get, clear_schema_fn clear, const plugin::module& module = plugin::module());
+    void bind(schema_definition* schema);
+    const schema_definition* get(const std::string& schema_name);
+    std::vector<std::string> names() const;
+    void clear();
+
+  private:
+    struct entry {
+        const schema_definition* schema_ = nullptr;
+        get_schema_fn get_ = nullptr;
+        clear_schema_fn clear_ = nullptr;
+        plugin::module module_;
+    };
+
+    std::map<std::string, entry> entries_;
+};
+
+IFC_PARSE_API schema_registry& schema_registry_instance();
+
 IFC_PARSE_API const schema_definition* schema_by_name(const std::string& schema_name);
 
 IFC_PARSE_API std::vector<std::string> schema_names();