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new field '__name' in metatables to help better error messages

This commit is contained in:
Roberto Ierusalimschy 2014-02-11 15:39:15 -02:00
parent 6b30774469
commit 4a1ed6e6e5
1 changed files with 11 additions and 3 deletions
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14
lauxlib.c
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@ -1,5 +1,5 @@
/*
** $Id: lauxlib.c,v 1.256 2014/01/05 14:04:46 roberto Exp roberto $
** $Id: lauxlib.c,v 1.257 2014/02/05 19:14:53 roberto Exp roberto $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
@ -169,8 +169,14 @@ LUALIB_API int luaL_argerror (lua_State *L, int arg, const char *extramsg) {
static int typeerror (lua_State *L, int arg, const char *tname) {
const char *msg = lua_pushfstring(L, "%s expected, got %s",
tname, luaL_typename(L, arg));
const char *msg;
const char *typearg = luaL_typename(L, arg);
if (lua_getmetatable(L, arg)) {
lua_getfield(L, -1, "__name");
if (lua_isstring(L, -1))
typearg = lua_tostring(L, -1);
}
msg = lua_pushfstring(L, "%s expected, got %s", tname, typearg);
return luaL_argerror(L, arg, msg);
}
@ -275,6 +281,8 @@ LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
return 0; /* leave previous value on top, but return 0 */
lua_pop(L, 1);
lua_newtable(L); /* create metatable */
lua_pushstring(L, tname);
lua_setfield(L, -2, "__name"); /* metatable.__name = tname */
lua_pushvalue(L, -1);
lua_setfield(L, LUA_REGISTRYINDEX, tname); /* registry.name = metatable */
return 1;