Created LdLua class.

src/ld-library.c

@@ -15,6 +15,7 @@
 #include "ld-library.h"
 #include "ld-symbol-category.h"
 #include "ld-symbol.h"
+#include "ld-lua.h"
 
 
 /**
@@ -31,7 +32,7 @@
  */
 struct _LdLibraryPrivate
 {
-	gpointer script_state;
+	LdLua *lua;
 };
 
 G_DEFINE_TYPE (LdLibrary, ld_library, G_TYPE_OBJECT);
@@ -68,8 +69,7 @@ ld_library_init (LdLibrary *self)
 	self->priv = G_TYPE_INSTANCE_GET_PRIVATE
 		(self, LD_TYPE_LIBRARY, LdLibraryPrivate);
 
-	/* TODO */
-	self->priv->script_state = NULL;
+	self->priv->lua = ld_lua_new ();
 
 	self->categories = g_hash_table_new_full (g_str_hash, g_str_equal,
 		(GDestroyNotify) g_free, (GDestroyNotify) g_object_unref);
@@ -82,6 +82,7 @@ ld_library_finalize (GObject *gobject)
 
 	self = LD_LIBRARY (gobject);
 
+	g_object_unref (self->priv->lua);
 	g_hash_table_destroy (self->categories);
 
 	/* Chain up to the parent class. */

src/ld-lua.c

@@ -16,12 +16,17 @@
 #include "config.h"
 
 #include "ld-library.h"
+#include "ld-symbol-category.h"
 #include "ld-lua.h"
 
 
-/* TODO */
-/* A virtual superclass can be made for this. */
-
+/**
+ * SECTION:ld-lua
+ * @short_description: Lua symbol engine.
+ * @see_also: #LdSymbol
+ *
+ * #LdLua is a symbol engine that uses Lua scripts to manage symbols.
+ */
 /* Lua state belongs to the library.
  * One Lua file should be able to register multiple symbols.
  */
@@ -36,12 +41,25 @@
  *
  */
 
-static void *
-ld_lua_alloc (void *ud, void *ptr, size_t osize, size_t nsize);
+/*
+ * LdLuaPrivate:
+ * @L: Lua state.
+ *
+ * The library contains the real function for rendering.
+ */
+struct _LdLuaPrivate
+{
+	lua_State *L;
+};
+
+G_DEFINE_TYPE (LdLua, ld_lua, G_TYPE_OBJECT);
+
+static void ld_lua_finalize (GObject *gobject);
+
+static void *ld_lua_alloc (void *ud, void *ptr, size_t osize, size_t nsize);
 
 
-static int
-ld_lua_logdiag_register (lua_State *L);
+static int ld_lua_logdiag_register (lua_State *L);
 
 static luaL_Reg ld_lua_logdiag_lib[] =
 {
@@ -50,18 +68,12 @@ static luaL_Reg ld_lua_logdiag_lib[] =
 };
 
 
-static int
-ld_lua_cairo_move_to (lua_State *L);
-static int
-ld_lua_cairo_line_to (lua_State *L);
-static int
-ld_lua_cairo_stroke (lua_State *L);
-static int
-ld_lua_cairo_stroke_preserve (lua_State *L);
-static int
-ld_lua_cairo_fill (lua_State *L);
-static int
-ld_lua_cairo_fill_preserve (lua_State *L);
+static int ld_lua_cairo_move_to (lua_State *L);
+static int ld_lua_cairo_line_to (lua_State *L);
+static int ld_lua_cairo_stroke (lua_State *L);
+static int ld_lua_cairo_stroke_preserve (lua_State *L);
+static int ld_lua_cairo_fill (lua_State *L);
+static int ld_lua_cairo_fill_preserve (lua_State *L);
 
 static luaL_Reg ld_lua_cairo_table[] =
 {
@@ -74,15 +86,30 @@ static luaL_Reg ld_lua_cairo_table[] =
 	{NULL, NULL}
 };
 
+
 /* ===== Generic =========================================================== */
 
-lua_State *
-ld_lua_init (void)
+static void
+ld_lua_class_init (LdLuaClass *klass)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (klass);
+	object_class->finalize = ld_lua_finalize;
+
+	g_type_class_add_private (klass, sizeof (LdLuaPrivate));
+}
+
+static void
+ld_lua_init (LdLua *self)
 {
 	lua_State *L;
 
-	L = lua_newstate (ld_lua_alloc, NULL);
-	g_return_val_if_fail (L != NULL, NULL);
+	self->priv = G_TYPE_INSTANCE_GET_PRIVATE
+		(self, LD_TYPE_LUA, LdLuaPrivate);
+
+	L = self->priv->L = lua_newstate (ld_lua_alloc, NULL);
+	g_return_if_fail (L != NULL);
 
 	/* TODO: lua_atpanic () */
 
@@ -100,10 +127,29 @@ ld_lua_init (void)
 	luaL_register (L, "logdiag", ld_lua_logdiag_lib);
 }
 
-void
-ld_lua_destroy (lua_State *L)
+static void
+ld_lua_finalize (GObject *gobject)
 {
-	lua_close (L);
+	LdLua *self;
+
+	self = LD_LUA (gobject);
+	lua_close (self->priv->L);
+
+	/* Chain up to the parent class. */
+	G_OBJECT_CLASS (ld_lua_parent_class)->finalize (gobject);
+}
+
+/**
+ * ld_lua_new:
+ * @library: A library object.
+ * @filename: The file from which the symbol will be loaded.
+ *
+ * Load a symbol from a file into the library.
+ */
+LdLua *
+ld_lua_new (void)
+{
+	return g_object_new (LD_TYPE_LUA, NULL);
 }
 
 static void *
@@ -134,6 +180,7 @@ ld_lua_logdiag_register (lua_State *L)
 	/* TODO: Push a function. */
 	lua_call (L, 1, 0);
 #endif /* 0 */
+	return 0;
 }
 
 /* ===== Cairo ============================================================= */
@@ -147,6 +194,11 @@ push_cairo_object (lua_State *L, cairo_t *cr)
 	lua_newtable (L);
 
 	/* Add methods. */
+	/* XXX: The light user data pointer gets invalid after the end of
+	 *      "render" function invocation. If the script stores the "cr" object
+	 *      in some global variable and then tries to reuse it the next time,
+	 *      the application will go SIGSEGV.
+	 */
 	for (fn = ld_lua_cairo_table; fn->name; fn++)
 	{
 		lua_pushlightuserdata (L, cr);
@@ -155,6 +207,7 @@ push_cairo_object (lua_State *L, cairo_t *cr)
 	}
 }
 
+/* TODO: Implement the functions. */
 static int
 ld_lua_cairo_move_to (lua_State *L)
 {

src/ld-lua.h

@@ -14,11 +14,47 @@
 G_BEGIN_DECLS
 
 
-lua_State *
-ld_lua_init (void);
+#define LD_TYPE_LUA (ld_lua_get_type ())
+#define LD_LUA(obj) (G_TYPE_CHECK_INSTANCE_CAST \
+	((obj), LD_TYPE_LUA, LdLua))
+#define LD_LUA_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST \
+	((klass), LD_TYPE_LUA, LdLuaClass))
+#define LD_IS_LUA(obj) (G_TYPE_CHECK_INSTANCE_TYPE \
+	((obj), LD_TYPE_LUA))
+#define LD_IS_LUA_CLASS(klass) (G_TYPE_CHECK_INSTANCE_TYPE \
+	((klass), LD_TYPE_LUA))
+#define LD_LUA_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS \
+	((obj), LD_LUA, LdLuaClass))
 
-void
-ld_lua_destroy (lua_State *L);
+typedef struct _LdLua LdLua;
+typedef struct _LdLuaPrivate LdLuaPrivate;
+typedef struct _LdLuaClass LdLuaClass;
+
+
+struct _LdLua
+{
+/*< private >*/
+	GObject parent_instance;
+	LdLuaPrivate *priv;
+
+/*< public >*/
+	gchar *name;
+};
+
+/* TODO: A virtual superclass, so other engines can be used. */
+struct _LdLuaClass
+{
+	GObjectClass parent_class;
+};
+
+
+GType ld_lua_get_type (void) G_GNUC_CONST;
+
+LdLua *ld_lua_new (void);
+/* TODO: Implement the following: */
+gboolean ld_lua_check_file (LdLua *lua, const gchar *filename);
+gboolean ld_lua_load_file_to_category (LdLua *lua, const gchar *filename,
+	LdSymbolCategory *category);
 
 
 G_END_DECLS