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lua_objlen calls __len metamethod on tables (if present)

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Roberto Ierusalimschy 2009-12-07 13:49:47 -02:00
parent df1dc3f1f5
commit 86312e1a7d
1 changed files with 13 additions and 6 deletions
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19
lapi.c
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@ -1,5 +1,5 @@
/*
** $Id: lapi.c,v 2.100 2009/11/09 19:10:48 roberto Exp roberto $
** $Id: lapi.c,v 2.101 2009/11/27 15:37:59 roberto Exp roberto $
** Lua API
** See Copyright Notice in lua.h
*/
@ -365,11 +365,18 @@ LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
LUA_API size_t lua_objlen (lua_State *L, int idx) {
StkId o = index2addr(L, idx);
switch (ttype(o)) {
case LUA_TSTRING: return tsvalue(o)->len;
case LUA_TUSERDATA: return uvalue(o)->len;
case LUA_TTABLE: return luaH_getn(hvalue(o));
default: return 0;
if (ttisuserdata(o)) return uvalue(o)->len;
else {
size_t res;
TValue temp;
lua_lock(L);
res = luaV_len(L, o, &temp);
if (res == cast(size_t, -1)) {
const TValue *t = &temp;
res = tonumber(t, &temp) ? nvalue(t) : 0;
}
lua_unlock(L);
return res;
}
}