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`tinsert' and `tremove' also use LUA_FIRSTINDEX

This commit is contained in:
Roberto Ierusalimschy 2004-05-10 15:06:14 -03:00
parent 7e41612eb2
commit b072e4ea0b
1 changed files with 14 additions and 14 deletions
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28
ltablib.c
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@ -1,5 +1,5 @@
/*
** $Id: ltablib.c,v 1.23 2004/04/30 20:13:38 roberto Exp roberto $
** $Id: ltablib.c,v 1.24 2004/05/10 17:50:51 roberto Exp roberto $
** Library for Table Manipulation
** See Copyright Notice in lua.h
*/
@ -69,19 +69,19 @@ static int luaB_setn (lua_State *L) {
static int luaB_tinsert (lua_State *L) {
int v = lua_gettop(L); /* number of arguments */
int n = aux_getn(L, 1) + 1;
int e = aux_getn(L, 1) + LUA_FIRSTINDEX; /* first empty element */
int pos; /* where to insert new element */
if (v == 2) /* called with only 2 arguments */
pos = n; /* insert new element at the end */
pos = e; /* insert new element at the end */
else {
pos = luaL_checkint(L, 2); /* 2nd argument is the position */
if (pos > n) n = pos; /* `grow' array if necessary */
if (pos > e) e = pos; /* `grow' array if necessary */
v = 3; /* function may be called with more than 3 args */
}
luaL_setn(L, 1, n); /* new size */
while (--n >= pos) { /* move up elements */
lua_rawgeti(L, 1, n);
lua_rawseti(L, 1, n+1); /* t[n+1] = t[n] */
luaL_setn(L, 1, e - LUA_FIRSTINDEX + 1); /* new size */
while (--e >= pos) { /* move up elements */
lua_rawgeti(L, 1, e);
lua_rawseti(L, 1, e+1); /* t[e+1] = t[e] */
}
lua_pushvalue(L, v);
lua_rawseti(L, 1, pos); /* t[pos] = v */
@ -90,17 +90,17 @@ static int luaB_tinsert (lua_State *L) {
static int luaB_tremove (lua_State *L) {
int n = aux_getn(L, 1);
int pos = luaL_optint(L, 2, n);
if (n <= 0) return 0; /* table is `empty' */
luaL_setn(L, 1, n-1); /* t.n = n-1 */
int e = aux_getn(L, 1) + LUA_FIRSTINDEX - 1;
int pos = luaL_optint(L, 2, e);
if (e < LUA_FIRSTINDEX) return 0; /* table is `empty' */
luaL_setn(L, 1, e - LUA_FIRSTINDEX); /* t.n = n-1 */
lua_rawgeti(L, 1, pos); /* result = t[pos] */
for ( ;pos<n; pos++) {
for ( ;pos<e; pos++) {
lua_rawgeti(L, 1, pos+1);
lua_rawseti(L, 1, pos); /* t[pos] = t[pos+1] */
}
lua_pushnil(L);
lua_rawseti(L, 1, n); /* t[n] = nil */
lua_rawseti(L, 1, e); /* t[e] = nil */
return 1;
}