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new 'table.pack' function

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This commit is contained in:
Roberto Ierusalimschy 2009-12-07 13:50:27 -02:00
parent 86312e1a7d
commit a4472490bc
1 changed files with 25 additions and 1 deletions
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26
ltablib.c
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@ -1,5 +1,5 @@
/*
** $Id: ltablib.c,v 1.48 2009/11/24 12:05:44 roberto Exp roberto $
** $Id: ltablib.c,v 1.49 2009/11/26 17:35:13 roberto Exp roberto $
** Library for Table Manipulation
** See Copyright Notice in lua.h
*/
@ -167,12 +167,35 @@ static int tconcat (lua_State *L) {
}
/*
** {======================================================
** Pack
** =======================================================
*/
static int pack (lua_State *L) {
int top = lua_gettop(L);
lua_createtable(L, top, 1); /* create result table */
/* use function environment as a temporary place to keep new table */
lua_replace(L, LUA_ENVIRONINDEX);
lua_pushinteger(L, top); /* number of elements */
lua_setfield(L, LUA_ENVIRONINDEX, "n"); /* t.n = number of elements */
for (; top >= 1; top--) /* assign elements */
lua_rawseti(L, LUA_ENVIRONINDEX, top);
lua_pushvalue(L, LUA_ENVIRONINDEX); /* return new table */
return 1;
}
/* }====================================================== */
/*
** {======================================================
** Quicksort
** (based on `Algorithms in MODULA-3', Robert Sedgewick;
** Addison-Wesley, 1993.)
** =======================================================
*/
@ -279,6 +302,7 @@ static const luaL_Reg tab_funcs[] = {
{"getn", getn},
{"maxn", maxn},
{"insert", tinsert},
{"pack", pack},
{"remove", tremove},
{"setn", setn},
{"sort", sort},