287 lines
7.2 KiB
C
287 lines
7.2 KiB
C
/*
|
|
** $Id: ltablib.c,v 1.38.1.3 2008/02/14 16:46:58 roberto Exp $
|
|
** Library for Table Manipulation
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
|
|
#include <stddef.h>
|
|
|
|
#define ltablib_c
|
|
#define LUA_LIB
|
|
|
|
#include "lua.h"
|
|
|
|
#include "lauxlib.h"
|
|
#include "lualib.h"
|
|
|
|
|
|
#define aux_getn(L,n) (luaL_checktype(L, n, LUA_TTABLE), luaL_getn(L, n))
|
|
|
|
|
|
static int foreachi (lua_State *L) {
|
|
int i;
|
|
int n = aux_getn(L, 1);
|
|
luaL_checktype(L, 2, LUA_TFUNCTION);
|
|
for (i=1; i <= n; i++) {
|
|
lua_pushvalue(L, 2); /* function */
|
|
lua_pushinteger(L, i); /* 1st argument */
|
|
lua_rawgeti(L, 1, i); /* 2nd argument */
|
|
lua_call(L, 2, 1);
|
|
if (!lua_isnil(L, -1))
|
|
return 1;
|
|
lua_pop(L, 1); /* remove nil result */
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int foreach (lua_State *L) {
|
|
luaL_checktype(L, 1, LUA_TTABLE);
|
|
luaL_checktype(L, 2, LUA_TFUNCTION);
|
|
lua_pushnil(L); /* first key */
|
|
while (lua_next(L, 1)) {
|
|
lua_pushvalue(L, 2); /* function */
|
|
lua_pushvalue(L, -3); /* key */
|
|
lua_pushvalue(L, -3); /* value */
|
|
lua_call(L, 2, 1);
|
|
if (!lua_isnil(L, -1))
|
|
return 1;
|
|
lua_pop(L, 2); /* remove value and result */
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int maxn (lua_State *L) {
|
|
lua_Number max = 0;
|
|
luaL_checktype(L, 1, LUA_TTABLE);
|
|
lua_pushnil(L); /* first key */
|
|
while (lua_next(L, 1)) {
|
|
lua_pop(L, 1); /* remove value */
|
|
if (lua_type(L, -1) == LUA_TNUMBER) {
|
|
lua_Number v = lua_tonumber(L, -1);
|
|
if (v > max) max = v;
|
|
}
|
|
}
|
|
lua_pushnumber(L, max);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int getn (lua_State *L) {
|
|
lua_pushinteger(L, aux_getn(L, 1));
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int setn (lua_State *L) {
|
|
luaL_checktype(L, 1, LUA_TTABLE);
|
|
#ifndef luaL_setn
|
|
luaL_setn(L, 1, luaL_checkint(L, 2));
|
|
#else
|
|
luaL_error(L, LUA_QL("setn") " is obsolete");
|
|
#endif
|
|
lua_pushvalue(L, 1);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int tinsert (lua_State *L) {
|
|
int e = aux_getn(L, 1) + 1; /* first empty element */
|
|
int pos; /* where to insert new element */
|
|
switch (lua_gettop(L)) {
|
|
case 2: { /* called with only 2 arguments */
|
|
pos = e; /* insert new element at the end */
|
|
break;
|
|
}
|
|
case 3: {
|
|
int i;
|
|
pos = luaL_checkint(L, 2); /* 2nd argument is the position */
|
|
if (pos > e) e = pos; /* `grow' array if necessary */
|
|
for (i = e; i > pos; i--) { /* move up elements */
|
|
lua_rawgeti(L, 1, i-1);
|
|
lua_rawseti(L, 1, i); /* t[i] = t[i-1] */
|
|
}
|
|
break;
|
|
}
|
|
default: {
|
|
return luaL_error(L, "wrong number of arguments to " LUA_QL("insert"));
|
|
}
|
|
}
|
|
luaL_setn(L, 1, e); /* new size */
|
|
lua_rawseti(L, 1, pos); /* t[pos] = v */
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int tremove (lua_State *L) {
|
|
int e = aux_getn(L, 1);
|
|
int pos = luaL_optint(L, 2, e);
|
|
if (!(1 <= pos && pos <= e)) /* position is outside bounds? */
|
|
return 0; /* nothing to remove */
|
|
luaL_setn(L, 1, e - 1); /* t.n = n-1 */
|
|
lua_rawgeti(L, 1, pos); /* result = t[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, e); /* t[e] = nil */
|
|
return 1;
|
|
}
|
|
|
|
|
|
static void addfield (lua_State *L, luaL_Buffer *b, int i) {
|
|
lua_rawgeti(L, 1, i);
|
|
if (!lua_isstring(L, -1))
|
|
luaL_error(L, "invalid value (%s) at index %d in table for "
|
|
LUA_QL("concat"), luaL_typename(L, -1), i);
|
|
luaL_addvalue(b);
|
|
}
|
|
|
|
|
|
static int tconcat (lua_State *L) {
|
|
luaL_Buffer b;
|
|
size_t lsep;
|
|
int i, last;
|
|
const char *sep = luaL_optlstring(L, 2, "", &lsep);
|
|
luaL_checktype(L, 1, LUA_TTABLE);
|
|
i = luaL_optint(L, 3, 1);
|
|
last = luaL_opt(L, luaL_checkint, 4, luaL_getn(L, 1));
|
|
luaL_buffinit(L, &b);
|
|
for (; i < last; i++) {
|
|
addfield(L, &b, i);
|
|
luaL_addlstring(&b, sep, lsep);
|
|
}
|
|
if (i == last) /* add last value (if interval was not empty) */
|
|
addfield(L, &b, i);
|
|
luaL_pushresult(&b);
|
|
return 1;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
** {======================================================
|
|
** Quicksort
|
|
** (based on `Algorithms in MODULA-3', Robert Sedgewick;
|
|
** Addison-Wesley, 1993.)
|
|
*/
|
|
|
|
|
|
static void set2 (lua_State *L, int i, int j) {
|
|
lua_rawseti(L, 1, i);
|
|
lua_rawseti(L, 1, j);
|
|
}
|
|
|
|
static int sort_comp (lua_State *L, int a, int b) {
|
|
if (!lua_isnil(L, 2)) { /* function? */
|
|
int res;
|
|
lua_pushvalue(L, 2);
|
|
lua_pushvalue(L, a-1); /* -1 to compensate function */
|
|
lua_pushvalue(L, b-2); /* -2 to compensate function and `a' */
|
|
lua_call(L, 2, 1);
|
|
res = lua_toboolean(L, -1);
|
|
lua_pop(L, 1);
|
|
return res;
|
|
}
|
|
else /* a < b? */
|
|
return lua_lessthan(L, a, b);
|
|
}
|
|
|
|
static void auxsort (lua_State *L, int l, int u) {
|
|
while (l < u) { /* for tail recursion */
|
|
int i, j;
|
|
/* sort elements a[l], a[(l+u)/2] and a[u] */
|
|
lua_rawgeti(L, 1, l);
|
|
lua_rawgeti(L, 1, u);
|
|
if (sort_comp(L, -1, -2)) /* a[u] < a[l]? */
|
|
set2(L, l, u); /* swap a[l] - a[u] */
|
|
else
|
|
lua_pop(L, 2);
|
|
if (u-l == 1) break; /* only 2 elements */
|
|
i = (l+u)/2;
|
|
lua_rawgeti(L, 1, i);
|
|
lua_rawgeti(L, 1, l);
|
|
if (sort_comp(L, -2, -1)) /* a[i]<a[l]? */
|
|
set2(L, i, l);
|
|
else {
|
|
lua_pop(L, 1); /* remove a[l] */
|
|
lua_rawgeti(L, 1, u);
|
|
if (sort_comp(L, -1, -2)) /* a[u]<a[i]? */
|
|
set2(L, i, u);
|
|
else
|
|
lua_pop(L, 2);
|
|
}
|
|
if (u-l == 2) break; /* only 3 elements */
|
|
lua_rawgeti(L, 1, i); /* Pivot */
|
|
lua_pushvalue(L, -1);
|
|
lua_rawgeti(L, 1, u-1);
|
|
set2(L, i, u-1);
|
|
/* a[l] <= P == a[u-1] <= a[u], only need to sort from l+1 to u-2 */
|
|
i = l; j = u-1;
|
|
for (;;) { /* invariant: a[l..i] <= P <= a[j..u] */
|
|
/* repeat ++i until a[i] >= P */
|
|
while (lua_rawgeti(L, 1, ++i), sort_comp(L, -1, -2)) {
|
|
if (i>u) luaL_error(L, "invalid order function for sorting");
|
|
lua_pop(L, 1); /* remove a[i] */
|
|
}
|
|
/* repeat --j until a[j] <= P */
|
|
while (lua_rawgeti(L, 1, --j), sort_comp(L, -3, -1)) {
|
|
if (j<l) luaL_error(L, "invalid order function for sorting");
|
|
lua_pop(L, 1); /* remove a[j] */
|
|
}
|
|
if (j<i) {
|
|
lua_pop(L, 3); /* pop pivot, a[i], a[j] */
|
|
break;
|
|
}
|
|
set2(L, i, j);
|
|
}
|
|
lua_rawgeti(L, 1, u-1);
|
|
lua_rawgeti(L, 1, i);
|
|
set2(L, u-1, i); /* swap pivot (a[u-1]) with a[i] */
|
|
/* a[l..i-1] <= a[i] == P <= a[i+1..u] */
|
|
/* adjust so that smaller half is in [j..i] and larger one in [l..u] */
|
|
if (i-l < u-i) {
|
|
j=l; i=i-1; l=i+2;
|
|
}
|
|
else {
|
|
j=i+1; i=u; u=j-2;
|
|
}
|
|
auxsort(L, j, i); /* call recursively the smaller one */
|
|
} /* repeat the routine for the larger one */
|
|
}
|
|
|
|
static int sort (lua_State *L) {
|
|
int n = aux_getn(L, 1);
|
|
luaL_checkstack(L, 40, ""); /* assume array is smaller than 2^40 */
|
|
if (!lua_isnoneornil(L, 2)) /* is there a 2nd argument? */
|
|
luaL_checktype(L, 2, LUA_TFUNCTION);
|
|
lua_settop(L, 2); /* make sure there is two arguments */
|
|
auxsort(L, 1, n);
|
|
return 0;
|
|
}
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
static const luaL_Reg tab_funcs[] = {
|
|
{"concat", tconcat},
|
|
{"foreach", foreach},
|
|
{"foreachi", foreachi},
|
|
{"getn", getn},
|
|
{"maxn", maxn},
|
|
{"insert", tinsert},
|
|
{"remove", tremove},
|
|
{"setn", setn},
|
|
{"sort", sort},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
|
|
LUALIB_API int luaopen_table (lua_State *L) {
|
|
luaL_register(L, LUA_TABLIBNAME, tab_funcs);
|
|
return 1;
|
|
}
|
|
|