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more direct implementation of 'table.pack'

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This commit is contained in:
Roberto Ierusalimschy 2014-05-16 15:53:25 -03:00
parent 0aa32fa0cb
commit 17159b491c
1 changed files with 6 additions and 10 deletions
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16
ltablib.c
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@ -1,5 +1,5 @@
/*
** $Id: ltablib.c,v 1.68 2014/04/04 16:38:11 roberto Exp roberto $
** $Id: ltablib.c,v 1.69 2014/04/12 14:43:50 roberto Exp roberto $
** Library for Table Manipulation
** See Copyright Notice in lua.h
*/
@ -118,18 +118,14 @@ static int tconcat (lua_State *L) {
*/
static int pack (lua_State *L) {
int i;
int n = lua_gettop(L); /* number of elements to pack */
lua_createtable(L, n, 1); /* create result table */
lua_insert(L, 1); /* put it at index 1 */
for (i = n; i >= 1; i--) /* assign elements */
lua_rawseti(L, 1, i);
lua_pushinteger(L, n);
lua_setfield(L, -2, "n"); /* t.n = number of elements */
if (n > 0) { /* at least one element? */
int i;
lua_pushvalue(L, 1);
lua_rawseti(L, -2, 1); /* insert first element */
lua_replace(L, 1); /* move table into index 1 */
for (i = n; i >= 2; i--) /* assign other elements */
lua_rawseti(L, 1, i);
}
lua_setfield(L, 1, "n"); /* t.n = number of elements */
return 1; /* return table */
}