luaclass: add support for new()

Signed-off-by: Julien Danjou <julien@danjou.info>

common/luaclass.c

@@ -302,4 +302,44 @@ luaA_class_newindex(lua_State *L)
     return 0;
 }
 
+/** Generic constructor function for objects.
+ * \param L The Lua VM state.
+ * \return The number of elements pushed on stack.
+ */
+int
+luaA_class_new(lua_State *L, lua_class_t *lua_class)
+{
+    /* Check we have a table that should contains some properties */
+    luaA_checktable(L, 2);
+
+    /* Create a new object */
+    void *object = lua_class->allocator(L);
+
+    /* Push the first key before iterating */
+    lua_pushnil(L);
+    /* Iterate over the property keys */
+    while(lua_next(L, 2))
+    {
+        /* Check that the key is a string.
+         * We cannot call tostring blindly or Lua will convert a key that is a
+         * number TO A STRING, confusing lua_next() */
+        if(lua_isstring(L, -2))
+        {
+            /* Lookup the property using token */
+            size_t len;
+            const char *attr = lua_tolstring(L, -2, &len);
+            lua_class_property_t *prop =
+                lua_class_property_array_getbyid(&lua_class->properties,
+                                                 a_tokenize(attr, len));
+
+            if(prop && prop->new)
+                prop->new(L, object);
+        }
+        /* Remove value */
+        lua_pop(L, 1);
+    }
+
+    return 1;
+}
+
 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80

common/luaclass.h

@@ -72,6 +72,7 @@ void luaA_class_add_property(lua_class_t *, awesome_token_t, const char *,
 int luaA_usemetatable(lua_State *, int, int);
 int luaA_class_index(lua_State *);
 int luaA_class_newindex(lua_State *);
+int luaA_class_new(lua_State *, lua_class_t *);
 
 #define LUA_CLASS_FUNCS(prefix, lua_class) \
     static inline int                                                          \

common/lualib.h

@@ -141,6 +141,12 @@ luaA_toudata(lua_State *L, int ud, const char *tname)
     return p;
 }
 
+#define luaA_checktable(L, n) \
+    do { \
+        if(!lua_istable(L, n)) \
+            luaL_typerror(L, n, "table"); \
+    } while(0)
+
 #endif
 
 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80

luaa.h

@@ -35,21 +35,6 @@
     luaA_warn(L, "%s: This function is deprecated and will be removed, see %s", \
               __FUNCTION__, repl)
 
-#define DO_LUA_TOSTRING(type, prefix, lua_type) \
-    static int \
-    luaA_##prefix##_tostring(lua_State *L) \
-    { \
-        type *p = luaL_checkudata(L, 1, lua_type); \
-        lua_pushfstring(L, lua_type ": %p", p); \
-        return 1; \
-    }
-
-#define luaA_checktable(L, n) \
-    do { \
-        if(!lua_istable(L, n)) \
-            luaL_typerror(L, n, "table"); \
-    } while(0)
-
 #define luaA_checkscreen(screen) \
     do { \
         if(screen < 0 || screen >= globalconf.screens.len) \