*
* Types registry.
*
- * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright 2010, 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
#include <glib.h>
#include <errno.h>
-/*
- * Type hash table contains the registered types. Type registration is typically
- * performed by a type plugin.
- * TODO: support plugin unload (unregistration of types).
- */
-GHashTable *type_classes;
-
-struct type_class *lookup_type(GQuark qname)
+static
+struct type *
+ lookup_type_scope(GQuark type_name, struct type_scope *scope)
{
- return g_hash_table_lookup(type_classes,
- (gconstpointer) (unsigned long) qname);
+ return g_hash_table_lookup(scope->types,
+ (gconstpointer) (unsigned long) type_name);
}
-static void free_type(struct type_class *type_class)
+struct type *lookup_type(GQuark type_name, struct type_scope *scope)
{
- type_class->free(type_class);
+ struct type *type;
+
+ while (scope) {
+ type = lookup_type_scope(type_name, scope);
+ if (type)
+ return type;
+ scope = scope->parent_scope;
+ }
+ return NULL;
}
-int register_type(struct type_class *type_class)
+int register_type(GQuark name, struct type *type, struct type_scope *scope)
{
- if (lookup_type(type_class->name))
+ g_assert(name == type->name);
+
+ if (!name)
+ return -EPERM;
+
+ /* Only lookup in local scope */
+ if (lookup_type_scope(name, scope))
return -EEXIST;
- g_hash_table_insert(type_classes,
- (gpointer) (unsigned long) type_class->name,
- type_class);
+ g_hash_table_insert(scope->types,
+ (gpointer) (unsigned long) name,
+ type);
+ type_ref(type);
return 0;
}
-void type_ref(struct type_class *type_class)
+static
+struct declaration *
+ lookup_declaration_scope(GQuark field_name, struct declaration_scope *scope)
{
- type_class->ref++;
+ return g_hash_table_lookup(scope->declarations,
+ (gconstpointer) (unsigned long) field_name);
}
-void type_unref(struct type_class *type_class)
+struct declaration *
+ lookup_declaration(GQuark field_name, struct declaration_scope *scope)
{
- if (!--type_class->ref)
- free_type(type_class);
+ struct declaration *declaration;
+
+ while (scope) {
+ declaration = lookup_declaration_scope(field_name, scope);
+ if (declaration)
+ return declaration;
+ scope = scope->parent_scope;
+ }
+ return NULL;
}
-int init_types(void)
+int register_declaration(GQuark field_name, struct declaration *declaration,
+ struct declaration_scope *scope)
{
- type_classes = g_hash_table_new_full(g_direct_hash, g_direct_equal,
- NULL, (GDestroyNotify) free_type);
- if (!type_classes)
- return -ENOMEM;
+ if (!field_name)
+ return -EPERM;
+
+ /* Only lookup in local scope */
+ if (lookup_declaration_scope(field_name, scope))
+ return -EEXIST;
+
+ g_hash_table_insert(scope->declarations,
+ (gpointer) (unsigned long) field_name,
+ declaration);
+ declaration_ref(declaration);
return 0;
}
-int finalize_types(void)
+void type_ref(struct type *type)
{
- g_hash_table_destroy(type_classes);
- return 0;
+ type->ref++;
+}
+
+void type_unref(struct type *type)
+{
+ if (!--type->ref)
+ type->type_free(type);
+}
+
+void declaration_ref(struct declaration *declaration)
+{
+ declaration->ref++;
+}
+
+void declaration_unref(struct declaration *declaration)
+{
+ if (!--declaration->ref)
+ declaration->type->declaration_free(declaration);
+}
+
+struct type_scope *
+ new_type_scope(struct type_scope *parent_scope)
+{
+ struct type_scope *scope = g_new(struct type_scope, 1);
+
+ scope->types = g_hash_table_new_full(g_direct_hash,
+ g_direct_equal, NULL,
+ (GDestroyNotify) type_unref);
+ scope->parent_scope = parent_scope;
+ return scope;
+}
+
+void free_type_scope(struct type_scope *scope)
+{
+ g_hash_table_destroy(scope->types);
+ g_free(scope);
+}
+
+struct declaration_scope *
+ new_declaration_scope(struct declaration_scope *parent_scope)
+{
+ struct declaration_scope *scope = g_new(struct declaration_scope, 1);
+
+ scope->declarations = g_hash_table_new_full(g_direct_hash,
+ g_direct_equal, NULL,
+ (GDestroyNotify) declaration_unref);
+ scope->parent_scope = parent_scope;
+ return scope;
+}
+
+void free_declaration_scope(struct declaration_scope *scope)
+{
+ g_hash_table_destroy(scope->declarations);
+ g_free(scope);
}