/*
** $Id: ltablib.c,v 1.63 2011/11/28 17:26:30 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"
#include <string.h>

#define aux_getn(L,n)  \
	(luaL_checktype(L, n, LUA_TTABLE), 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) {
  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"));
    }
  }
  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 */
  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_isstringornumberconvertabletostring(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_len(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;
}

typedef struct luaL_SaneBuffer
{
  char* b;  /* buffer address */
  size_t size;  /* buffer size */
  size_t n;  /* number of characters in buffer */
  int stackindex; /* the reserved stack index for storing buffer data that doesn't fit in the initial buffer */
  char initb[LUAL_BUFFERSIZE];  /* initial buffer */
} luaL_SaneBuffer;

static void luaL_init_SaneBuffer(lua_State* L, luaL_SaneBuffer* B)
{
  B->b = B->initb;
  B->n = 0;
  B->size = LUAL_BUFFERSIZE;

  lua_pushnil(L); /* reserve stack space */
  B->stackindex = lua_gettop(L);
}

static void luaL_destroy_SaneBuffer(lua_State* L, luaL_SaneBuffer* B)
{
  lua_remove(L, B->stackindex); /* remove reserved stack space */
}

static char* luaL_prep_SaneBuffer_size (lua_State* L, luaL_SaneBuffer* B, size_t sz)
{
  if (B->size - B->n < sz)
  {  /* not enough space? */
    size_t newsize = B->size * 2;  /* double buffer size */
    if (newsize - B->n < sz)  /* not bit enough? */
      newsize = B->n + sz;
    if (newsize < B->n || newsize - B->n < sz)
      luaL_error(L, "buffer too large");
    /* create larger buffer */
    char* newbuff = (char *)lua_newuserdata(L, newsize * sizeof(char));
    /* move content to new buffer */
    memcpy(newbuff, B->b, B->n * sizeof(char));
    lua_replace(L, B->stackindex);  /* remove old buffer */
    B->b = newbuff;
    B->size = newsize;
  }

  return &B->b[B->n];
}


static void luaL_add_lstring (lua_State* L, luaL_SaneBuffer* B, const char* s, size_t l)
{
  char* b = luaL_prep_SaneBuffer_size(L,  B, l);
  memcpy(b, s, l * sizeof(char));
  B->n += l;
}

static int tpairsconcat (lua_State *L)
{
  size_t lsep;
  const char *sep = luaL_optlstring(L, 2, "", &lsep);
  luaL_checktype(L, 1, LUA_TTABLE);
  luaL_SaneBuffer b;
  luaL_init_SaneBuffer(L, &b);
  int added = 0;

  lua_pushnil(L);
  while (lua_next(L, 1))
  {
    if (!lua_isstringornumberconvertabletostring(L, -1))
      luaL_error(L, "invalid value (%s) in table for " LUA_QL("pairs_concat"), luaL_typename(L, -1));

    if (added)
      luaL_add_lstring(L, &b, sep, lsep);

    size_t l;
    const char* s = lua_tolstring(L, -1, &l); /* get value as string */
    luaL_add_lstring(L, &b, s, l);
    lua_remove(L, -1);  /* remove value */

    added = 1;
  }

  lua_pushlstring(L, b.b, b.n);
  luaL_destroy_SaneBuffer(L, &b);

  return 1;
}


/*
** {======================================================
** Pack/unpack
** =======================================================
*/

static int pack (lua_State *L) {
  int n = lua_gettop(L);  /* number of elements to pack */
  lua_createtable(L, n, 1);  /* create result table */
  lua_pushinteger(L, n);
  lua_setfield(L, -2, "n");  /* t.n = number of elements */
  if (n > 0) {  /* at least one element? */
    int i;
    lua_pushvalue(L, 1);
    lua_rawseti(L, -2, 1);  /* insert first element */
    lua_replace(L, 1);  /* move table into index 1 */
    for (i = n; i >= 2; i--)  /* assign other elements */
      lua_rawseti(L, 1, i);
  }
  return 1;  /* return table */
}


static int unpack (lua_State *L) {
  int i, e, n;
  luaL_checktype(L, 1, LUA_TTABLE);
  i = luaL_optint(L, 2, 1);
  e = luaL_opt(L, luaL_checkint, 3, luaL_len(L, 1));
  if (i > e) return 0;  /* empty range */
  n = e - i + 1;  /* number of elements */
  if (n <= 0 || !lua_checkstack(L, n))  /* n <= 0 means arith. overflow */
    return luaL_error(L, "too many results to unpack");
  lua_rawgeti(L, 1, i);  /* push arg[i] (avoiding overflow problems) */
  while (i++ < e)  /* push arg[i + 1...e] */
    lua_rawgeti(L, 1, i);
  return n;
}

/* }====================================================== */



/*
** {======================================================
** 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_compare(L, a, b, LUA_OPLT);
}

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},
  {"pairs_concat", tpairsconcat},
#if defined(LUA_COMPAT_MAXN)
  {"maxn", maxn},
#endif
  {"insert", tinsert},
  {"pack", pack},
  {"unpack", unpack},
  {"remove", tremove},
  {"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;
}