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Implement parts of Lua symbol registration.

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The human name and area now gets resolved.
This commit is contained in:
Přemysl Eric Janouch 2010-10-27 19:22:33 +02:00
parent 1c5127068e
commit 8b5fa9a49a
1 changed files with 80 additions and 5 deletions
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85
src/ld-lua.c
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@ -90,6 +90,8 @@ static int ld_lua_private_unregister_cb (lua_State *L);
static int ld_lua_logdiag_register (lua_State *L);
static gchar *get_translation (lua_State *L, int index);
static void read_symbol_area (lua_State *L, int index, LdSymbolArea *area);
static luaL_Reg ld_lua_logdiag_lib[] =
{
@ -351,12 +353,14 @@ ld_lua_private_unregister_cb (lua_State *L)
/* ===== Application library =============================================== */
/* XXX: This function is damn too long. */
static int
ld_lua_logdiag_register (lua_State *L)
{
LdLuaData *ud;
LdLuaSymbol *symbol;
const gchar *name;
gchar *human_name;
lua_getfield (L, LUA_REGISTRYINDEX, LD_LUA_DATA_INDEX);
ud = lua_touserdata (L, -1);
@ -367,20 +371,34 @@ ld_lua_logdiag_register (lua_State *L)
name = lua_tostring (L, 1);
if (!name)
luaL_error (L, "register: bad or missing argument #%d", 1);
if (!lua_istable (L, 2))
luaL_error (L, "register: bad or missing argument #%d", 2);
if (!lua_istable (L, 3))
luaL_error (L, "register: bad or missing argument #%d", 3);
if (!lua_istable (L, 4))
luaL_error (L, "register: bad or missing argument #%d", 4);
if (!lua_isfunction (L, 5))
luaL_error (L, "register: bad or missing argument #%d", 5);
/* TODO: Create a symbol using the given parameters:
* 2. names (table) -> use g_get_language_names ()
* 3. area (table)
* 4. terminals (table)
*/
/* Create a symbol using the given parameters. */
/* XXX: If an error occurs, this object will not be freed. */
symbol = g_object_new (LD_TYPE_LUA_SYMBOL, NULL);
symbol->priv->lua = ud->self;
g_object_ref (ud->self);
symbol->priv->name = g_strdup (name);
human_name = get_translation (L, 2);
if (!human_name)
human_name = g_strdup (name);
symbol->priv->human_name = human_name;
/* TODO: Check the values. */
read_symbol_area (L, 3, &symbol->priv->area);
/* TODO: Read and set the terminals (they're in a table). */
lua_pushvalue (L, 4);
/* Create an entry in the symbol table. */
lua_getfield (L, LUA_REGISTRYINDEX, LD_LUA_SYMBOLS_INDEX);
lua_pushlightuserdata (L, symbol);
@ -399,6 +417,63 @@ ld_lua_logdiag_register (lua_State *L)
return 0;
}
/*
* get_translation:
* @L: A Lua state.
* @index: Stack index of the table.
*
* Select an applicable translation from a table.
* The return value has to be freed with g_free().
*
* Return value: The translation, if found. If none was found, returns NULL.
*/
static gchar *
get_translation (lua_State *L, int index)
{
const gchar *const *lang;
gchar *result;
for (lang = g_get_language_names (); *lang; lang++)
{
lua_getfield (L, 2, *lang);
if (lua_isstring (L, -1))
{
result = g_strdup (lua_tostring (L, -1));
lua_pop (L, 1);
return result;
}
lua_pop (L, 1);
}
return NULL;
}
/*
* read_symbol_area:
* @L: A Lua state.
* @index: Stack index of the table.
* @area: Where the area will be returned.
*
* Read a symbol area from a Lua table.
*/
static void
read_symbol_area (lua_State *L, int index, LdSymbolArea *area)
{
if (lua_objlen (L, index) != 4)
return;
lua_rawgeti (L, index, 1);
area->x1 = lua_tonumber (L, -1);
lua_rawgeti (L, index, 2);
area->y1 = lua_tonumber (L, -1);
lua_rawgeti (L, index, 3);
area->x2 = lua_tonumber (L, -1);
lua_rawgeti (L, index, 4);
area->y2 = lua_tonumber (L, -1);
}
/* ===== Cairo ============================================================= */
static void