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/*
* luaobject.h - useful functions for handling Lua objects
*
* Copyright © 2010 Mason Larobina <mason.larobina@gmail.com>
* Copyright © 2009 Julien Danjou <julien@danjou.info>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef LUAKIT_COMMON_LUAOBJECT_H
#define LUAKIT_COMMON_LUAOBJECT_H
#include "common/luaclass.h"
#include "common/lualib.h"
#include "common/signal.h"
#include "globalconf.h"
gint luaH_settype(lua_State *L, lua_class_t *lua_class);
void luaH_object_setup(lua_State *L);
gpointer luaH_object_incref(lua_State *L, gint tud, gint oud);
void luaH_object_decref(lua_State *L, gint tud, gpointer oud);
/* Store an item in the environment table of an object.
* Removes the stored object from the stack.
* `ud` is the index of the object on the stack.
* `iud` is the index of the item on the stack.
* Return the item reference. */
static inline gpointer
luaH_object_ref_item(lua_State *L, gint ud, gint iud) {
/* Get the env table from the object */
lua_getfenv(L, ud);
gpointer p = luaH_object_incref(L, -1, iud < 0 ? iud - 1 : iud);
/* Remove env table */
lua_pop(L, 1);
return p;
}
/* Unref an item from the environment table of an object.
* `ud` is the index of the object on the stack.
* `p` is the item. */
static inline void
luaH_object_unref_item(lua_State *L, gint ud, gpointer p) {
/* Get the env table from the object */
lua_getfenv(L, ud);
/* Decrement */
luaH_object_decref(L, -1, p);
/* Remove env table */
lua_pop(L, 1);
}
/* Push an object item on the stack.
* `ud` is the object index on the stack.
* `p` is the item pointer.
* Returns the number of element pushed on stack. */
static inline gint
luaH_object_push_item(lua_State *L, gint ud, gpointer p) {
/* Get env table of the object */
lua_getfenv(L, ud);
/* Push key */
lua_pushlightuserdata(L, p);
/* Get env.pointer */
lua_rawget(L, -2);
/* Remove env table */
lua_remove(L, -2);
return 1;
}
static inline void
luaH_object_registry_push(lua_State *L) {
lua_pushliteral(L, LUAKIT_OBJECT_REGISTRY_KEY);
lua_rawget(L, LUA_REGISTRYINDEX);
}
/* Reference an object and return a pointer to it. That only works with
* userdata, table, thread or function.
* Removes the referenced object from the stack.
* `oud` is the object index on the stack.
* Returns the object reference, or NULL if not referenceable. */
static inline gpointer
luaH_object_ref(lua_State *L, gint oud) {
luaH_object_registry_push(L);
gpointer p = luaH_object_incref(L, -1, oud < 0 ? oud - 1 : oud);
lua_pop(L, 1);
return p;
}
/* Reference an object and return a pointer to it checking its type. That only
* works with userdata.
* `oud` is the object index on the stack.
* `class` is the class of object expected
* Return the object reference, or NULL if not referenceable. */
static inline gpointer
luaH_object_ref_class(lua_State *L, gint oud, lua_class_t *class) {
luaH_checkudata(L, oud, class);
return luaH_object_ref(L, oud);
}
/* Unreference an object and return a pointer to it. That only works with
* userdata, table, thread or function.
* `oud` is the object index on the stack. */
static inline void
luaH_object_unref(lua_State *L, gpointer p) {
luaH_object_registry_push(L);
luaH_object_decref(L, -1, p);
lua_pop(L, 1);
}
/* Push a referenced object onto the stack.
* `p` is the object to push.
* Returns is the number of element pushed on stack.
*/
static inline gint
luaH_object_push(lua_State *L, gpointer p) {
luaH_object_registry_push(L);
lua_pushlightuserdata(L, p);
lua_rawget(L, -2);
lua_remove(L, -2);
return 1;
}
gint signal_object_emit(lua_State *, signal_t *signals,
const gchar *name, gint nargs, gint nret);
void luaH_object_add_signal(lua_State *L, gint oud,
const gchar *name, gint ud);
void luaH_object_remove_signal(lua_State *L, gint oud,
const gchar *name , gint ud);
gint luaH_object_emit_signal(lua_State *L, gint oud,
const gchar *name, gint nargs, gint nret);
gint luaH_object_add_signal_simple(lua_State *L);
gint luaH_object_remove_signal_simple(lua_State *L);
gint luaH_object_emit_signal_simple(lua_State *L);
gint luaH_object_property_signal(lua_State *, gint, luakit_token_t);
#define LUA_OBJECT_FUNCS(lua_class, type, prefix) \
LUA_CLASS_FUNCS(prefix, lua_class) \
static inline type * \
prefix##_new(lua_State *L) { \
type *p = lua_newuserdata(L, sizeof(type)); \
p_clear(p, 1); \
p->signals = signal_new(); \
luaH_settype(L, &(lua_class)); \
lua_newtable(L); \
lua_newtable(L); \
lua_setmetatable(L, -2); \
lua_setfenv(L, -2); \
lua_pushvalue(L, -1); \
luaH_class_emit_signal(L, &(lua_class), "new", 1, 0); \
return p; \
}
#define OBJECT_EXPORT_PROPERTY(pfx, type, field) \
fieldtypeof(type, field) \
pfx##_get_##field(type *object) { \
return object->field; \
}
#define LUA_OBJECT_EXPORT_PROPERTY(pfx, type, field, pusher) \
static gint \
luaH_##pfx##_get_##field(lua_State *L, type *object) { \
pusher(L, object->field); \
return 1; \
}
gint luaH_object_tostring(lua_State *);
gint luaH_object_gc(lua_State *);
#define LUA_OBJECT_META(prefix) \
{ "__tostring", luaH_object_tostring }, \
{ "add_signal", luaH_object_add_signal_simple }, \
{ "remove_signal", luaH_object_remove_signal_simple }, \
{ "emit_signal", luaH_object_emit_signal_simple },
#endif
// vim: ft=c:et:sw=4:ts=8:sts=4:tw=80
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