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-rw-r--r--libs/liblua/src/ltablib.c357
1 files changed, 357 insertions, 0 deletions
diff --git a/libs/liblua/src/ltablib.c b/libs/liblua/src/ltablib.c
new file mode 100644
index 0000000000..8f78afb7f2
--- /dev/null
+++ b/libs/liblua/src/ltablib.c
@@ -0,0 +1,357 @@
+/*
+** $Id: ltablib.c,v 1.79 2014/11/02 19:19:04 roberto Exp $
+** Library for Table Manipulation
+** See Copyright Notice in lua.h
+*/
+
+#define ltablib_c
+#define LUA_LIB
+
+#include "lprefix.h"
+
+
+#include <limits.h>
+#include <stddef.h>
+
+#include "lua.h"
+
+#include "lauxlib.h"
+#include "lualib.h"
+
+
+
+/*
+** Structure with table-access functions
+*/
+typedef struct {
+ int (*geti) (lua_State *L, int idx, lua_Integer n);
+ void (*seti) (lua_State *L, int idx, lua_Integer n);
+} TabA;
+
+
+/*
+** Check that 'arg' has a table and set access functions in 'ta' to raw
+** or non-raw according to the presence of corresponding metamethods.
+*/
+static void checktab (lua_State *L, int arg, TabA *ta) {
+ ta->geti = NULL; ta->seti = NULL;
+ if (lua_getmetatable(L, arg)) {
+ lua_pushliteral(L, "__index"); /* 'index' metamethod */
+ if (lua_rawget(L, -2) != LUA_TNIL)
+ ta->geti = lua_geti;
+ lua_pushliteral(L, "__newindex"); /* 'newindex' metamethod */
+ if (lua_rawget(L, -3) != LUA_TNIL)
+ ta->seti = lua_seti;
+ lua_pop(L, 3); /* pop metatable plus both metamethods */
+ }
+ if (ta->geti == NULL || ta->seti == NULL) {
+ luaL_checktype(L, arg, LUA_TTABLE); /* must be table for raw methods */
+ if (ta->geti == NULL) ta->geti = lua_rawgeti;
+ if (ta->seti == NULL) ta->seti = lua_rawseti;
+ }
+}
+
+
+#define aux_getn(L,n,ta) (checktab(L, n, ta), luaL_len(L, n))
+
+
+#if defined(LUA_COMPAT_MAXN)
+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;
+}
+#endif
+
+
+static int tinsert (lua_State *L) {
+ TabA ta;
+ lua_Integer e = aux_getn(L, 1, &ta) + 1; /* first empty element */
+ lua_Integer 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: {
+ lua_Integer i;
+ pos = luaL_checkinteger(L, 2); /* 2nd argument is the position */
+ luaL_argcheck(L, 1 <= pos && pos <= e, 2, "position out of bounds");
+ for (i = e; i > pos; i--) { /* move up elements */
+ (*ta.geti)(L, 1, i - 1);
+ (*ta.seti)(L, 1, i); /* t[i] = t[i - 1] */
+ }
+ break;
+ }
+ default: {
+ return luaL_error(L, "wrong number of arguments to 'insert'");
+ }
+ }
+ (*ta.seti)(L, 1, pos); /* t[pos] = v */
+ return 0;
+}
+
+
+static int tremove (lua_State *L) {
+ TabA ta;
+ lua_Integer size = aux_getn(L, 1, &ta);
+ lua_Integer pos = luaL_optinteger(L, 2, size);
+ if (pos != size) /* validate 'pos' if given */
+ luaL_argcheck(L, 1 <= pos && pos <= size + 1, 1, "position out of bounds");
+ (*ta.geti)(L, 1, pos); /* result = t[pos] */
+ for ( ; pos < size; pos++) {
+ (*ta.geti)(L, 1, pos + 1);
+ (*ta.seti)(L, 1, pos); /* t[pos] = t[pos + 1] */
+ }
+ lua_pushnil(L);
+ (*ta.seti)(L, 1, pos); /* t[pos] = nil */
+ return 1;
+}
+
+
+static int tmove (lua_State *L) {
+ TabA ta;
+ lua_Integer f = luaL_checkinteger(L, 2);
+ lua_Integer e = luaL_checkinteger(L, 3);
+ lua_Integer t = luaL_checkinteger(L, 4);
+ int tt = !lua_isnoneornil(L, 5) ? 5 : 1; /* destination table */
+ /* the following restriction avoids several problems with overflows */
+ luaL_argcheck(L, f > 0, 2, "initial position must be positive");
+ if (e >= f) { /* otherwise, nothing to move */
+ lua_Integer n, i;
+ ta.geti = (luaL_getmetafield(L, 1, "__index") == LUA_TNIL)
+ ? (luaL_checktype(L, 1, LUA_TTABLE), lua_rawgeti)
+ : lua_geti;
+ ta.seti = (luaL_getmetafield(L, tt, "__newindex") == LUA_TNIL)
+ ? (luaL_checktype(L, tt, LUA_TTABLE), lua_rawseti)
+ : lua_seti;
+ n = e - f + 1; /* number of elements to move */
+ if (t > f) {
+ for (i = n - 1; i >= 0; i--) {
+ (*ta.geti)(L, 1, f + i);
+ (*ta.seti)(L, tt, t + i);
+ }
+ }
+ else {
+ for (i = 0; i < n; i++) {
+ (*ta.geti)(L, 1, f + i);
+ (*ta.seti)(L, tt, t + i);
+ }
+ }
+ }
+ lua_pushvalue(L, tt); /* return "to table" */
+ return 1;
+}
+
+
+static void addfield (lua_State *L, luaL_Buffer *b, TabA *ta, lua_Integer i) {
+ (*ta->geti)(L, 1, i);
+ if (!lua_isstring(L, -1))
+ luaL_error(L, "invalid value (%s) at index %d in table for 'concat'",
+ luaL_typename(L, -1), i);
+ luaL_addvalue(b);
+}
+
+
+static int tconcat (lua_State *L) {
+ TabA ta;
+ luaL_Buffer b;
+ size_t lsep;
+ lua_Integer i, last;
+ const char *sep = luaL_optlstring(L, 2, "", &lsep);
+ checktab(L, 1, &ta);
+ i = luaL_optinteger(L, 3, 1);
+ last = luaL_opt(L, luaL_checkinteger, 4, luaL_len(L, 1));
+ luaL_buffinit(L, &b);
+ for (; i < last; i++) {
+ addfield(L, &b, &ta, i);
+ luaL_addlstring(&b, sep, lsep);
+ }
+ if (i == last) /* add last value (if interval was not empty) */
+ addfield(L, &b, &ta, i);
+ luaL_pushresult(&b);
+ return 1;
+}
+
+
+/*
+** {======================================================
+** Pack/unpack
+** =======================================================
+*/
+
+static int pack (lua_State *L) {
+ int i;
+ int n = lua_gettop(L); /* number of elements to pack */
+ lua_createtable(L, n, 1); /* create result table */
+ lua_insert(L, 1); /* put it at index 1 */
+ for (i = n; i >= 1; i--) /* assign elements */
+ lua_rawseti(L, 1, i);
+ lua_pushinteger(L, n);
+ lua_setfield(L, 1, "n"); /* t.n = number of elements */
+ return 1; /* return table */
+}
+
+
+static int unpack (lua_State *L) {
+ TabA ta;
+ lua_Integer i, e;
+ lua_Unsigned n;
+ checktab(L, 1, &ta);
+ i = luaL_optinteger(L, 2, 1);
+ e = luaL_opt(L, luaL_checkinteger, 3, luaL_len(L, 1));
+ if (i > e) return 0; /* empty range */
+ n = (lua_Unsigned)e - i; /* number of elements minus 1 (avoid overflows) */
+ if (n >= (unsigned int)INT_MAX || !lua_checkstack(L, (int)(++n)))
+ return luaL_error(L, "too many results to unpack");
+ do { /* must have at least one element */
+ (*ta.geti)(L, 1, i); /* push arg[i..e] */
+ } while (i++ < e);
+
+ return (int)n;
+}
+
+/* }====================================================== */
+
+
+
+/*
+** {======================================================
+** Quicksort
+** (based on 'Algorithms in MODULA-3', Robert Sedgewick;
+** Addison-Wesley, 1993.)
+** =======================================================
+*/
+
+
+static void set2 (lua_State *L, TabA *ta, int i, int j) {
+ (*ta->seti)(L, 1, i);
+ (*ta->seti)(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_compare(L, a, b, LUA_OPLT);
+}
+
+static void auxsort (lua_State *L, TabA *ta, int l, int u) {
+ while (l < u) { /* for tail recursion */
+ int i, j;
+ /* sort elements a[l], a[(l+u)/2] and a[u] */
+ (*ta->geti)(L, 1, l);
+ (*ta->geti)(L, 1, u);
+ if (sort_comp(L, -1, -2)) /* a[u] < a[l]? */
+ set2(L, ta, l, u); /* swap a[l] - a[u] */
+ else
+ lua_pop(L, 2);
+ if (u-l == 1) break; /* only 2 elements */
+ i = (l+u)/2;
+ (*ta->geti)(L, 1, i);
+ (*ta->geti)(L, 1, l);
+ if (sort_comp(L, -2, -1)) /* a[i]<a[l]? */
+ set2(L, ta, i, l);
+ else {
+ lua_pop(L, 1); /* remove a[l] */
+ (*ta->geti)(L, 1, u);
+ if (sort_comp(L, -1, -2)) /* a[u]<a[i]? */
+ set2(L, ta, i, u);
+ else
+ lua_pop(L, 2);
+ }
+ if (u-l == 2) break; /* only 3 elements */
+ (*ta->geti)(L, 1, i); /* Pivot */
+ lua_pushvalue(L, -1);
+ (*ta->geti)(L, 1, u-1);
+ set2(L, ta, 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 ((*ta->geti)(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 ((*ta->geti)(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, ta, i, j);
+ }
+ (*ta->geti)(L, 1, u-1);
+ (*ta->geti)(L, 1, i);
+ set2(L, ta, 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, ta, j, i); /* call recursively the smaller one */
+ } /* repeat the routine for the larger one */
+}
+
+static int sort (lua_State *L) {
+ TabA ta;
+ int n = (int)aux_getn(L, 1, &ta);
+ luaL_checkstack(L, 50, ""); /* assume array is smaller than 2^50 */
+ if (!lua_isnoneornil(L, 2)) /* is there a 2nd argument? */
+ luaL_checktype(L, 2, LUA_TFUNCTION);
+ lua_settop(L, 2); /* make sure there are two arguments */
+ auxsort(L, &ta, 1, n);
+ return 0;
+}
+
+/* }====================================================== */
+
+
+static const luaL_Reg tab_funcs[] = {
+ {"concat", tconcat},
+#if defined(LUA_COMPAT_MAXN)
+ {"maxn", maxn},
+#endif
+ {"insert", tinsert},
+ {"pack", pack},
+ {"unpack", unpack},
+ {"remove", tremove},
+ {"move", tmove},
+ {"sort", sort},
+ {NULL, NULL}
+};
+
+
+LUAMOD_API int luaopen_table (lua_State *L) {
+ luaL_newlib(L, tab_funcs);
+#if defined(LUA_COMPAT_UNPACK)
+ /* _G.unpack = table.unpack */
+ lua_getfield(L, -1, "unpack");
+ lua_setglobal(L, "unpack");
+#endif
+ return 1;
+}
+
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