[redis.git] / deps / lua / src / ltablib.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  luaL_error(L, LUA_QL("setn") " is obsolete");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;
}
Commit	Line	Data
21d3294c	1	/*
	2	** $Id: ltablib.c,v 1.38.1.3 2008/02/14 16:46:58 roberto Exp $
	3	** Library for Table Manipulation
	4	** See Copyright Notice in lua.h
	5	*/
	6
	7
	8	#include <stddef.h>
	9
	10	#define ltablib_c
	11	#define LUA_LIB
	12
	13	#include "lua.h"
	14
	15	#include "lauxlib.h"
	16	#include "lualib.h"
	17
	18
	19	#define aux_getn(L,n) (luaL_checktype(L, n, LUA_TTABLE), luaL_getn(L, n))
	20
	21
	22	static int foreachi (lua_State *L) {
	23	int i;
	24	int n = aux_getn(L, 1);
	25	luaL_checktype(L, 2, LUA_TFUNCTION);
	26	for (i=1; i <= n; i++) {
	27	lua_pushvalue(L, 2); /* function */
	28	lua_pushinteger(L, i); /* 1st argument */
	29	lua_rawgeti(L, 1, i); /* 2nd argument */
	30	lua_call(L, 2, 1);
	31	if (!lua_isnil(L, -1))
	32	return 1;
	33	lua_pop(L, 1); /* remove nil result */
	34	}
	35	return 0;
	36	}
	37
	38
	39	static int foreach (lua_State *L) {
	40	luaL_checktype(L, 1, LUA_TTABLE);
	41	luaL_checktype(L, 2, LUA_TFUNCTION);
	42	lua_pushnil(L); /* first key */
	43	while (lua_next(L, 1)) {
	44	lua_pushvalue(L, 2); /* function */
	45	lua_pushvalue(L, -3); /* key */
	46	lua_pushvalue(L, -3); /* value */
	47	lua_call(L, 2, 1);
	48	if (!lua_isnil(L, -1))
	49	return 1;
	50	lua_pop(L, 2); /* remove value and result */
	51	}
	52	return 0;
	53	}
	54
	55
	56	static int maxn (lua_State *L) {
	57	lua_Number max = 0;
	58	luaL_checktype(L, 1, LUA_TTABLE);
	59	lua_pushnil(L); /* first key */
	60	while (lua_next(L, 1)) {
	61	lua_pop(L, 1); /* remove value */
	62	if (lua_type(L, -1) == LUA_TNUMBER) {
	63	lua_Number v = lua_tonumber(L, -1);
	64	if (v > max) max = v;
65	}
66	}
67	lua_pushnumber(L, max);
68	return 1;
69	}
70
71
72	static int getn (lua_State *L) {
73	lua_pushinteger(L, aux_getn(L, 1));
74	return 1;
75	}
76
77
78	static int setn (lua_State *L) {
79	luaL_checktype(L, 1, LUA_TTABLE);
80	#ifndef luaL_setn
81	luaL_setn(L, 1, luaL_checkint(L, 2));
82	#else
83	luaL_error(L, LUA_QL("setn") " is obsolete");
84	#endif
85	lua_pushvalue(L, 1);
86	return 1;
87	}
88
89
90	static int tinsert (lua_State *L) {
91	int e = aux_getn(L, 1) + 1; /* first empty element */
92	int pos; /* where to insert new element */
93	switch (lua_gettop(L)) {
94	case 2: { /* called with only 2 arguments */
95	pos = e; /* insert new element at the end */
96	break;
97	}
98	case 3: {
99	int i;
100	pos = luaL_checkint(L, 2); /* 2nd argument is the position */
101	if (pos > e) e = pos; /* `grow' array if necessary */
102	for (i = e; i > pos; i--) { /* move up elements */
103	lua_rawgeti(L, 1, i-1);
104	lua_rawseti(L, 1, i); /* t[i] = t[i-1] */
105	}
106	break;
107	}
108	default: {
109	return luaL_error(L, "wrong number of arguments to " LUA_QL("insert"));
110	}
111	}
112	luaL_setn(L, 1, e); /* new size */
113	lua_rawseti(L, 1, pos); /* t[pos] = v */
114	return 0;
115	}
116
117
118	static int tremove (lua_State *L) {
119	int e = aux_getn(L, 1);
120	int pos = luaL_optint(L, 2, e);
121	if (!(1 <= pos && pos <= e)) /* position is outside bounds? */
122	return 0; /* nothing to remove */
123	luaL_setn(L, 1, e - 1); /* t.n = n-1 */
124	lua_rawgeti(L, 1, pos); /* result = t[pos] */
125	for ( ;pos<e; pos++) {
126	lua_rawgeti(L, 1, pos+1);
127	lua_rawseti(L, 1, pos); /* t[pos] = t[pos+1] */
128	}
129	lua_pushnil(L);
130	lua_rawseti(L, 1, e); /* t[e] = nil */
131	return 1;
132	}
133
134
135	static void addfield (lua_State L, luaL_Buffer b, int i) {
136	lua_rawgeti(L, 1, i);
137	if (!lua_isstring(L, -1))
138	luaL_error(L, "invalid value (%s) at index %d in table for "
139	LUA_QL("concat"), luaL_typename(L, -1), i);
140	luaL_addvalue(b);
141	}
142
143
144	static int tconcat (lua_State *L) {
145	luaL_Buffer b;
146	size_t lsep;
147	int i, last;
148	const char *sep = luaL_optlstring(L, 2, "", &lsep);
149	luaL_checktype(L, 1, LUA_TTABLE);
150	i = luaL_optint(L, 3, 1);
151	last = luaL_opt(L, luaL_checkint, 4, luaL_getn(L, 1));
152	luaL_buffinit(L, &b);
153	for (; i < last; i++) {
154	addfield(L, &b, i);
155	luaL_addlstring(&b, sep, lsep);
156	}
157	if (i == last) /* add last value (if interval was not empty) */
158	addfield(L, &b, i);
159	luaL_pushresult(&b);
160	return 1;
161	}
162
163
164
165	/*
166	** {======================================================
167	** Quicksort
168	** (based on `Algorithms in MODULA-3', Robert Sedgewick;
169	** Addison-Wesley, 1993.)
170	*/
171
172
173	static void set2 (lua_State *L, int i, int j) {
174	lua_rawseti(L, 1, i);
175	lua_rawseti(L, 1, j);
176	}
177
178	static int sort_comp (lua_State *L, int a, int b) {
179	if (!lua_isnil(L, 2)) { /* function? */
180	int res;
181	lua_pushvalue(L, 2);
182	lua_pushvalue(L, a-1); /* -1 to compensate function */
183	lua_pushvalue(L, b-2); /* -2 to compensate function and `a' */
184	lua_call(L, 2, 1);
185	res = lua_toboolean(L, -1);
186	lua_pop(L, 1);
187	return res;
188	}
189	else /* a < b? */
190	return lua_lessthan(L, a, b);
191	}
192
193	static void auxsort (lua_State *L, int l, int u) {
194	while (l < u) { /* for tail recursion */
195	int i, j;
196	/* sort elements a[l], a[(l+u)/2] and a[u] */
197	lua_rawgeti(L, 1, l);
198	lua_rawgeti(L, 1, u);
199	if (sort_comp(L, -1, -2)) /* a[u] < a[l]? */
200	set2(L, l, u); /* swap a[l] - a[u] */
201	else
202	lua_pop(L, 2);
203	if (u-l == 1) break; /* only 2 elements */
204	i = (l+u)/2;
205	lua_rawgeti(L, 1, i);
206	lua_rawgeti(L, 1, l);
207	if (sort_comp(L, -2, -1)) /* a[i]<a[l]? */
208	set2(L, i, l);
209	else {
210	lua_pop(L, 1); /* remove a[l] */
211	lua_rawgeti(L, 1, u);
212	if (sort_comp(L, -1, -2)) /* a[u]<a[i]? */
213	set2(L, i, u);
214	else
215	lua_pop(L, 2);
216	}
217	if (u-l == 2) break; /* only 3 elements */
218	lua_rawgeti(L, 1, i); /* Pivot */
219	lua_pushvalue(L, -1);
220	lua_rawgeti(L, 1, u-1);
221	set2(L, i, u-1);
222	/* a[l] <= P == a[u-1] <= a[u], only need to sort from l+1 to u-2 */
223	i = l; j = u-1;
224	for (;;) { /* invariant: a[l..i] <= P <= a[j..u] */
225	/* repeat ++i until a[i] >= P */
226	while (lua_rawgeti(L, 1, ++i), sort_comp(L, -1, -2)) {
227	if (i>u) luaL_error(L, "invalid order function for sorting");
228	lua_pop(L, 1); /* remove a[i] */
229	}
230	/* repeat --j until a[j] <= P */
231	while (lua_rawgeti(L, 1, --j), sort_comp(L, -3, -1)) {
232	if (j<l) luaL_error(L, "invalid order function for sorting");
233	lua_pop(L, 1); /* remove a[j] */
234	}
235	if (j<i) {
236	lua_pop(L, 3); /* pop pivot, a[i], a[j] */
237	break;
238	}
239	set2(L, i, j);
240	}
241	lua_rawgeti(L, 1, u-1);
242	lua_rawgeti(L, 1, i);
243	set2(L, u-1, i); /* swap pivot (a[u-1]) with a[i] */
244	/* a[l..i-1] <= a[i] == P <= a[i+1..u] */
245	/* adjust so that smaller half is in [j..i] and larger one in [l..u] */
246	if (i-l < u-i) {
247	j=l; i=i-1; l=i+2;
248	}
249	else {
250	j=i+1; i=u; u=j-2;
251	}
252	auxsort(L, j, i); /* call recursively the smaller one */
253	} /* repeat the routine for the larger one */
254	}
255
256	static int sort (lua_State *L) {
257	int n = aux_getn(L, 1);
258	luaL_checkstack(L, 40, ""); /* assume array is smaller than 2^40 */
259	if (!lua_isnoneornil(L, 2)) /* is there a 2nd argument? */
260	luaL_checktype(L, 2, LUA_TFUNCTION);
261	lua_settop(L, 2); /* make sure there is two arguments */
262	auxsort(L, 1, n);
263	return 0;
264	}
265
266	/* }====================================================== */
267
268
269	static const luaL_Reg tab_funcs[] = {
270	{"concat", tconcat},
271	{"foreach", foreach},
272	{"foreachi", foreachi},
273	{"getn", getn},
274	{"maxn", maxn},
275	{"insert", tinsert},
276	{"remove", tremove},
277	{"setn", setn},
278	{"sort", sort},
279	{NULL, NULL}
280	};
281
282
283	LUALIB_API int luaopen_table (lua_State *L) {
284	luaL_register(L, LUA_TABLIBNAME, tab_funcs);
285	return 1;
286	}
287