Subversion Repositories WoWGM

/*

** $Id: lbaselib.c,v 1.191 2006/06/02 15:34:00 roberto Exp $

** Basic library

** See Copyright Notice in lua.h

*/

#include <ctype.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define lbaselib_c

#define LUA_LIB

#include "lua.h"

#include "lauxlib.h"

#include "lualib.h"

/*

** If your system does not support `stdout', you can just remove this function.

** If you need, you can define your own `print' function, following this

** model but changing `fputs' to put the strings at a proper place

** (a console window or a log file, for instance).

*/

static int luaB_print (lua_State *L) {

  int n = lua_gettop(L);  /* number of arguments */

  int i;

  lua_getglobal(L, "tostring");

  for (i=1; i<=n; i++) {

    const char *s;

    lua_pushvalue(L, -1);  /* function to be called */

    lua_pushvalue(L, i);   /* value to print */

    lua_call(L, 1, 1);

    s = lua_tostring(L, -1);  /* get result */

    if (s == NULL)

      return luaL_error(L, LUA_QL("tostring") " must return a string to "

                           LUA_QL("print"));

    if (i>1) fputs("\t", stdout);

    fputs(s, stdout);

    lua_pop(L, 1);  /* pop result */

  }

  fputs("\n", stdout);

  return 0;

}

static int luaB_tonumber (lua_State *L) {

  int base = luaL_optint(L, 2, 10);

  if (base == 10) {  /* standard conversion */

    luaL_checkany(L, 1);

    if (lua_isnumber(L, 1)) {

      lua_pushnumber(L, lua_tonumber(L, 1));

      return 1;

    }

  }

  else {

    const char *s1 = luaL_checkstring(L, 1);

    char *s2;

    unsigned long n;

    luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");

    n = strtoul(s1, &s2, base);

    if (s1 != s2) {  /* at least one valid digit? */

      while (isspace((unsigned char)(*s2))) s2++;  /* skip trailing spaces */

      if (*s2 == '\0') {  /* no invalid trailing characters? */

        lua_pushnumber(L, (lua_Number)n);

        return 1;

      }

    }

  }

  lua_pushnil(L);  /* else not a number */

  return 1;

}

static int luaB_error (lua_State *L) {

  int level = luaL_optint(L, 2, 1);

  lua_settop(L, 1);

  if (lua_isstring(L, 1) && level > 0) {  /* add extra information? */

    luaL_where(L, level);

    lua_pushvalue(L, 1);

    lua_concat(L, 2);

  }

  return lua_error(L);

}

static int luaB_getmetatable (lua_State *L) {

  luaL_checkany(L, 1);

  if (!lua_getmetatable(L, 1)) {

    lua_pushnil(L);

    return 1;  /* no metatable */

  }

  luaL_getmetafield(L, 1, "__metatable");

  return 1;  /* returns either __metatable field (if present) or metatable */

}

static int luaB_setmetatable (lua_State *L) {

  int t = lua_type(L, 2);

  luaL_checktype(L, 1, LUA_TTABLE);

  luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,

                    "nil or table expected");

  if (luaL_getmetafield(L, 1, "__metatable"))

    luaL_error(L, "cannot change a protected metatable");

  lua_settop(L, 2);

  lua_setmetatable(L, 1);

  return 1;

}

static void getfunc (lua_State *L) {

  if (lua_isfunction(L, 1)) lua_pushvalue(L, 1);

  else {

    lua_Debug ar;

    int level = luaL_optint(L, 1, 1);

    luaL_argcheck(L, level >= 0, 1, "level must be non-negative");

    if (lua_getstack(L, level, &ar) == 0)

      luaL_argerror(L, 1, "invalid level");

    lua_getinfo(L, "f", &ar);

    if (lua_isnil(L, -1))

      luaL_error(L, "no function environment for tail call at level %d",

                    level);

  }

}

static int luaB_getfenv (lua_State *L) {

  getfunc(L);

  if (lua_iscfunction(L, -1))  /* is a C function? */

    lua_pushvalue(L, LUA_GLOBALSINDEX);  /* return the thread's global env. */

  else

    lua_getfenv(L, -1);

  return 1;

}

static int luaB_setfenv (lua_State *L) {

  luaL_checktype(L, 2, LUA_TTABLE);

  getfunc(L);

  lua_pushvalue(L, 2);

  if (lua_isnumber(L, 1) && lua_tonumber(L, 1) == 0) {

    /* change environment of current thread */

    lua_pushthread(L);

    lua_insert(L, -2);

    lua_setfenv(L, -2);

    return 0;

  }

  else if (lua_iscfunction(L, -2) || lua_setfenv(L, -2) == 0)

    luaL_error(L,

          LUA_QL("setfenv") " cannot change environment of given object");

  return 1;

}

static int luaB_rawequal (lua_State *L) {

  luaL_checkany(L, 1);

  luaL_checkany(L, 2);

  lua_pushboolean(L, lua_rawequal(L, 1, 2));

  return 1;

}

static int luaB_rawget (lua_State *L) {

  luaL_checktype(L, 1, LUA_TTABLE);

  luaL_checkany(L, 2);

  lua_settop(L, 2);

  lua_rawget(L, 1);

  return 1;

}

static int luaB_rawset (lua_State *L) {

  luaL_checktype(L, 1, LUA_TTABLE);

  luaL_checkany(L, 2);

  luaL_checkany(L, 3);

  lua_settop(L, 3);

  lua_rawset(L, 1);

  return 1;

}

static int luaB_gcinfo (lua_State *L) {

  lua_pushinteger(L, lua_getgccount(L));

  return 1;

}

static int luaB_collectgarbage (lua_State *L) {

  static const char *const opts[] = {"stop", "restart", "collect",

    "count", "step", "setpause", "setstepmul", NULL};

  static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,

    LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL};

  int o = luaL_checkoption(L, 1, "collect", opts);

  int ex = luaL_optint(L, 2, 0);

  int res = lua_gc(L, optsnum[o], ex);

  switch (optsnum[o]) {

    case LUA_GCCOUNT: {

      int b = lua_gc(L, LUA_GCCOUNTB, 0);

      lua_pushnumber(L, res + ((lua_Number)b/1024));

      return 1;

    }

    case LUA_GCSTEP: {

      lua_pushboolean(L, res);

      return 1;

    }

    default: {

      lua_pushnumber(L, res);

      return 1;

    }

  }

}

static int luaB_type (lua_State *L) {

  luaL_checkany(L, 1);

  lua_pushstring(L, luaL_typename(L, 1));

  return 1;

}

static int luaB_next (lua_State *L) {

  luaL_checktype(L, 1, LUA_TTABLE);

  lua_settop(L, 2);  /* create a 2nd argument if there isn't one */

  if (lua_next(L, 1))

    return 2;

  else {

    lua_pushnil(L);

    return 1;

  }

}

static int luaB_pairs (lua_State *L) {

  luaL_checktype(L, 1, LUA_TTABLE);

  lua_pushvalue(L, lua_upvalueindex(1));  /* return generator, */

  lua_pushvalue(L, 1);  /* state, */

  lua_pushnil(L);  /* and initial value */

  return 3;

}

static int ipairsaux (lua_State *L) {

  int i = luaL_checkint(L, 2);

  luaL_checktype(L, 1, LUA_TTABLE);

  i++;  /* next value */

  lua_pushinteger(L, i);

  lua_rawgeti(L, 1, i);

  return (lua_isnil(L, -1)) ? 0 : 2;

}

static int luaB_ipairs (lua_State *L) {

  luaL_checktype(L, 1, LUA_TTABLE);

  lua_pushvalue(L, lua_upvalueindex(1));  /* return generator, */

  lua_pushvalue(L, 1);  /* state, */

  lua_pushinteger(L, 0);  /* and initial value */

  return 3;

}

static int load_aux (lua_State *L, int status) {

  if (status == 0)  /* OK? */

    return 1;

  else {

    lua_pushnil(L);

    lua_insert(L, -2);  /* put before error message */

    return 2;  /* return nil plus error message */

  }

}

static int luaB_loadstring (lua_State *L) {

  size_t l;

  const char *s = luaL_checklstring(L, 1, &l);

  const char *chunkname = luaL_optstring(L, 2, s);

  return load_aux(L, luaL_loadbuffer(L, s, l, chunkname));

}

static int luaB_loadfile (lua_State *L) {

  const char *fname = luaL_optstring(L, 1, NULL);

  return load_aux(L, luaL_loadfile(L, fname));

}

/*

** Reader for generic `load' function: `lua_load' uses the

** stack for internal stuff, so the reader cannot change the

** stack top. Instead, it keeps its resulting string in a

** reserved slot inside the stack.

*/

static const char *generic_reader (lua_State *L, void *ud, size_t *size) {

  (void)ud;  /* to avoid warnings */

  luaL_checkstack(L, 2, "too many nested functions");

  lua_pushvalue(L, 1);  /* get function */

  lua_call(L, 0, 1);  /* call it */

  if (lua_isnil(L, -1)) {

    *size = 0;

    return NULL;

  }

  else if (lua_isstring(L, -1)) {

    lua_replace(L, 3);  /* save string in a reserved stack slot */

    return lua_tolstring(L, 3, size);

  }

  else luaL_error(L, "reader function must return a string");

  return NULL;  /* to avoid warnings */

}

static int luaB_load (lua_State *L) {

  int status;

  const char *cname = luaL_optstring(L, 2, "=(load)");

  luaL_checktype(L, 1, LUA_TFUNCTION);

  lua_settop(L, 3);  /* function, eventual name, plus one reserved slot */

  status = lua_load(L, generic_reader, NULL, cname);

  return load_aux(L, status);

}

static int luaB_dofile (lua_State *L) {

  const char *fname = luaL_optstring(L, 1, NULL);

  int n = lua_gettop(L);

  if (luaL_loadfile(L, fname) != 0) lua_error(L);

  lua_call(L, 0, LUA_MULTRET);

  return lua_gettop(L) - n;

}

static int luaB_assert (lua_State *L) {

  luaL_checkany(L, 1);

  if (!lua_toboolean(L, 1))

    return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));

  return lua_gettop(L);

}

static int luaB_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_getn(L, 1));

  n = e - i + 1;  /* number of elements */

  if (n <= 0) return 0;  /* empty range */

  luaL_checkstack(L, n, "table too big to unpack");

  for (; i<=e; i++)  /* push arg[i...e] */

    lua_rawgeti(L, 1, i);

  return n;

}

static int luaB_select (lua_State *L) {

  int n = lua_gettop(L);

  if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {

    lua_pushinteger(L, n-1);

    return 1;

  }

  else {

    int i = luaL_checkint(L, 1);

    if (i < 0) i = n + i;

    else if (i > n) i = n;

    luaL_argcheck(L, 1 <= i, 1, "index out of range");

    return n - i;

  }

}

static int luaB_pcall (lua_State *L) {

  int status;

  luaL_checkany(L, 1);

  status = lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0);

  lua_pushboolean(L, (status == 0));

  lua_insert(L, 1);

  return lua_gettop(L);  /* return status + all results */

}

static int luaB_xpcall (lua_State *L) {

  int status;

  luaL_checkany(L, 2);

  lua_settop(L, 2);

  lua_insert(L, 1);  /* put error function under function to be called */

  status = lua_pcall(L, 0, LUA_MULTRET, 1);

  lua_pushboolean(L, (status == 0));

  lua_replace(L, 1);

  return lua_gettop(L);  /* return status + all results */

}

static int luaB_tostring (lua_State *L) {

  luaL_checkany(L, 1);

  if (luaL_callmeta(L, 1, "__tostring"))  /* is there a metafield? */

    return 1;  /* use its value */

  switch (lua_type(L, 1)) {

    case LUA_TNUMBER:

      lua_pushstring(L, lua_tostring(L, 1));

      break;

    case LUA_TSTRING:

      lua_pushvalue(L, 1);

      break;

    case LUA_TBOOLEAN:

      lua_pushstring(L, (lua_toboolean(L, 1) ? "true" : "false"));

      break;

    case LUA_TNIL:

      lua_pushliteral(L, "nil");

      break;

    default:

      lua_pushfstring(L, "%s: %p", luaL_typename(L, 1), lua_topointer(L, 1));

      break;

  }

  return 1;

}

static int luaB_newproxy (lua_State *L) {

  lua_settop(L, 1);

  lua_newuserdata(L, 0);  /* create proxy */

  if (lua_toboolean(L, 1) == 0)

    return 1;  /* no metatable */

  else if (lua_isboolean(L, 1)) {

    lua_newtable(L);  /* create a new metatable `m' ... */

    lua_pushvalue(L, -1);  /* ... and mark `m' as a valid metatable */

    lua_pushboolean(L, 1);

    lua_rawset(L, lua_upvalueindex(1));  /* weaktable[m] = true */

  }

  else {

    int validproxy = 0;  /* to check if weaktable[metatable(u)] == true */

    if (lua_getmetatable(L, 1)) {

      lua_rawget(L, lua_upvalueindex(1));

      validproxy = lua_toboolean(L, -1);

      lua_pop(L, 1);  /* remove value */

    }

    luaL_argcheck(L, validproxy, 1, "boolean or proxy expected");

    lua_getmetatable(L, 1);  /* metatable is valid; get it */

  }

  lua_setmetatable(L, 2);

  return 1;

}

static const luaL_Reg base_funcs[] = {

  {"assert", luaB_assert},

  {"collectgarbage", luaB_collectgarbage},

  {"dofile", luaB_dofile},

  {"error", luaB_error},

  {"gcinfo", luaB_gcinfo},

  {"getfenv", luaB_getfenv},

  {"getmetatable", luaB_getmetatable},

  {"loadfile", luaB_loadfile},

  {"load", luaB_load},

  {"loadstring", luaB_loadstring},

  {"next", luaB_next},

  {"pcall", luaB_pcall},

  {"print", luaB_print},

  {"rawequal", luaB_rawequal},

  {"rawget", luaB_rawget},

  {"rawset", luaB_rawset},

  {"select", luaB_select},

  {"setfenv", luaB_setfenv},

  {"setmetatable", luaB_setmetatable},

  {"tonumber", luaB_tonumber},

  {"tostring", luaB_tostring},

  {"type", luaB_type},

  {"unpack", luaB_unpack},

  {"xpcall", luaB_xpcall},

  {NULL, NULL}

};

/*

** {======================================================

** Coroutine library

** =======================================================

*/

static int auxresume (lua_State *L, lua_State *co, int narg) {

  int status;

  if (!lua_checkstack(co, narg))

    luaL_error(L, "too many arguments to resume");

  if (lua_status(co) == 0 && lua_gettop(co) == 0) {

    lua_pushliteral(L, "cannot resume dead coroutine");

    return -1;  /* error flag */

  }

  lua_xmove(L, co, narg);

  status = lua_resume(co, narg);

  if (status == 0 || status == LUA_YIELD) {

    int nres = lua_gettop(co);

    if (!lua_checkstack(L, nres))

      luaL_error(L, "too many results to resume");

    lua_xmove(co, L, nres);  /* move yielded values */

    return nres;

  }

  else {

    lua_xmove(co, L, 1);  /* move error message */

    return -1;  /* error flag */

  }

}

static int luaB_coresume (lua_State *L) {

  lua_State *co = lua_tothread(L, 1);

  int r;

  luaL_argcheck(L, co, 1, "coroutine expected");

  r = auxresume(L, co, lua_gettop(L) - 1);

  if (r < 0) {

    lua_pushboolean(L, 0);

    lua_insert(L, -2);

    return 2;  /* return false + error message */

  }

  else {

    lua_pushboolean(L, 1);

    lua_insert(L, -(r + 1));

    return r + 1;  /* return true + `resume' returns */

  }

}

static int luaB_auxwrap (lua_State *L) {

  lua_State *co = lua_tothread(L, lua_upvalueindex(1));

  int r = auxresume(L, co, lua_gettop(L));

  if (r < 0) {

    if (lua_isstring(L, -1)) {  /* error object is a string? */

      luaL_where(L, 1);  /* add extra info */

      lua_insert(L, -2);

      lua_concat(L, 2);

    }

    lua_error(L);  /* propagate error */

  }

  return r;

}

static int luaB_cocreate (lua_State *L) {

  lua_State *NL = lua_newthread(L);

  luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1), 1,

    "Lua function expected");

  lua_pushvalue(L, 1);  /* move function to top */

  lua_xmove(L, NL, 1);  /* move function from L to NL */

  return 1;

}

static int luaB_cowrap (lua_State *L) {

  luaB_cocreate(L);

  lua_pushcclosure(L, luaB_auxwrap, 1);

  return 1;

}

static int luaB_yield (lua_State *L) {

  return lua_yield(L, lua_gettop(L));

}

static int luaB_costatus (lua_State *L) {

  lua_State *co = lua_tothread(L, 1);

  luaL_argcheck(L, co, 1, "coroutine expected");

  if (L == co) lua_pushliteral(L, "running");

  else {

    switch (lua_status(co)) {

      case LUA_YIELD:

        lua_pushliteral(L, "suspended");

        break;

      case 0: {

        lua_Debug ar;

        if (lua_getstack(co, 0, &ar) > 0)  /* does it have frames? */

          lua_pushliteral(L, "normal");  /* it is running */

        else if (lua_gettop(co) == 0)

            lua_pushliteral(L, "dead");

        else

          lua_pushliteral(L, "suspended");  /* initial state */

        break;

      }

      default:  /* some error occured */

        lua_pushliteral(L, "dead");

        break;

    }

  }

  return 1;

}

static int luaB_corunning (lua_State *L) {

  if (lua_pushthread(L))

    return 0;  /* main thread is not a coroutine */

  else

    return 1;

}

static const luaL_Reg co_funcs[] = {

  {"create", luaB_cocreate},

  {"resume", luaB_coresume},

  {"running", luaB_corunning},

  {"status", luaB_costatus},

  {"wrap", luaB_cowrap},

  {"yield", luaB_yield},

  {NULL, NULL}

};

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

static void auxopen (lua_State *L, const char *name,

                     lua_CFunction f, lua_CFunction u) {

  lua_pushcfunction(L, u);

  lua_pushcclosure(L, f, 1);

  lua_setfield(L, -2, name);

}

static void base_open (lua_State *L) {

  /* set global _G */

  lua_pushvalue(L, LUA_GLOBALSINDEX);

  lua_setglobal(L, "_G");

  /* open lib into global table */

  luaL_register(L, "_G", base_funcs);

  lua_pushliteral(L, LUA_VERSION);

  lua_setglobal(L, "_VERSION");  /* set global _VERSION */

  /* `ipairs' and `pairs' need auxliliary functions as upvalues */

  auxopen(L, "ipairs", luaB_ipairs, ipairsaux);

  auxopen(L, "pairs", luaB_pairs, luaB_next);

  /* `newproxy' needs a weaktable as upvalue */

  lua_createtable(L, 0, 1);  /* new table `w' */

  lua_pushvalue(L, -1);  /* `w' will be its own metatable */

  lua_setmetatable(L, -2);

  lua_pushliteral(L, "kv");

  lua_setfield(L, -2, "__mode");  /* metatable(w).__mode = "kv" */

  lua_pushcclosure(L, luaB_newproxy, 1);

  lua_setglobal(L, "newproxy");  /* set global `newproxy' */

}

LUALIB_API int luaopen_base (lua_State *L) {

  base_open(L);

  luaL_register(L, LUA_COLIBNAME, co_funcs);

  return 2;

}