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new functions `pack' and `unpack'

This commit is contained in:
Roberto Ierusalimschy 2001-03-07 09:43:52 -03:00
parent 72d3d155b0
commit 2b2267069b
1 changed files with 28 additions and 7 deletions
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35
lbaselib.c
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@ -1,5 +1,5 @@
/*
** $Id: lbaselib.c,v 1.28 2001/02/23 17:28:12 roberto Exp roberto $
** $Id: lbaselib.c,v 1.29 2001/03/06 20:09:38 roberto Exp roberto $
** Basic library
** See Copyright Notice in lua.h
*/
@ -19,6 +19,13 @@
static void aux_setn (lua_State *L, int t, int n) {
lua_pushliteral(L, l_s("n"));
lua_pushnumber(L, n);
lua_settable(L, t);
}
/*
** If your system does not support `stderr', redefine this function, or
** redefine _ERRORMESSAGE so that it won't need _ALERT.
@ -296,6 +303,17 @@ static int luaB_dofile (lua_State *L) {
}
static int luaB_pack (lua_State *L) {
int n = lua_gettop(L);
lua_newtable(L);
aux_setn(L, -3, n);
lua_insert(L, 1);
while (n)
lua_rawseti(L, 1, n--);
return 1;
}
static int aux_unpack (lua_State *L, int arg) {
int n, i;
luaL_checktype(L, arg, LUA_TTABLE);
@ -307,6 +325,11 @@ static int aux_unpack (lua_State *L, int arg) {
}
static int luaB_unpack (lua_State *L) {
return aux_unpack(L, 1);
}
static int luaB_call (lua_State *L) {
int oldtop;
const l_char *options = luaL_opt_string(L, 3, l_s(""));
@ -436,9 +459,7 @@ static int luaB_tinsert (lua_State *L) {
pos = n+1;
else
pos = luaL_check_int(L, 2); /* 2nd argument is the position */
lua_pushliteral(L, l_s("n"));
lua_pushnumber(L, n+1);
lua_rawset(L, 1); /* t.n = n+1 */
aux_setn(L, 1, n+1); /* t.n = n+1 */
for (; n>=pos; n--) {
lua_rawgeti(L, 1, n);
lua_rawseti(L, 1, n+1); /* t[n+1] = t[n] */
@ -455,14 +476,12 @@ static int luaB_tremove (lua_State *L) {
n = lua_getn(L, 1);
pos = luaL_opt_int(L, 2, n);
if (n <= 0) return 0; /* table is `empty' */
aux_setn(L, 1, n-1); /* t.n = n-1 */
lua_rawgeti(L, 1, pos); /* result = t[pos] */
for ( ;pos<n; pos++) {
lua_rawgeti(L, 1, pos+1);
lua_rawseti(L, 1, pos); /* a[pos] = a[pos+1] */
}
lua_pushliteral(L, l_s("n"));
lua_pushnumber(L, n-1);
lua_rawset(L, 1); /* t.n = n-1 */
lua_pushnil(L);
lua_rawseti(L, 1, n); /* t[n] = nil */
return 1;
@ -678,6 +697,8 @@ static const luaL_reg base_funcs[] = {
{l_s("sort"), luaB_sort},
{l_s("tinsert"), luaB_tinsert},
{l_s("tremove"), luaB_tremove},
{l_s("pack"), luaB_pack},
{l_s("unpack"), luaB_unpack},
{l_s("xtype"), luaB_xtype},
};