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lua/lbaselib.c

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/*
** $Id: lbaselib.c,v 1.64 2002/04/05 18:54:31 roberto Exp roberto $
** Basic library
** See Copyright Notice in lua.h
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "luadebug.h"
#include "lualib.h"
/*
** If your system does not support `stderr', redefine this function, or
** redefine _ERRORMESSAGE so that it won't need _ALERT.
*/
static int luaB__ALERT (lua_State *L) {
fputs(luaL_check_string(L, 1), stderr);
return 0;
}
/*
** Basic implementation of _ERRORMESSAGE.
** The library `liolib' redefines _ERRORMESSAGE for better error information.
*/
static int luaB__ERRORMESSAGE (lua_State *L) {
luaL_check_type(L, 1, LUA_TSTRING);
lua_getglobal(L, LUA_ALERT);
if (lua_isfunction(L, -1)) { /* avoid error loop if _ALERT is not defined */
lua_Debug ar;
lua_pushliteral(L, "error: ");
lua_pushvalue(L, 1);
if (lua_getstack(L, 1, &ar)) {
lua_getinfo(L, "Sl", &ar);
if (ar.source && ar.currentline > 0) {
char buff[100];
sprintf(buff, "\n <%.70s: line %d>", ar.short_src, ar.currentline);
lua_pushstring(L, buff);
lua_concat(L, 2);
}
}
lua_pushliteral(L, "\n");
lua_concat(L, 3);
lua_rawcall(L, 1, 0);
}
return 0;
}
/*
** 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_rawcall(L, 1, 1);
s = lua_tostring(L, -1); /* get result */
if (s == NULL)
lua_error(L, "`tostring' must return a string to `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_opt_int(L, 2, 10);
if (base == 10) { /* standard conversion */
luaL_check_any(L, 1);
if (lua_isnumber(L, 1)) {
lua_pushnumber(L, lua_tonumber(L, 1));
return 1;
}
}
else {
const char *s1 = luaL_check_string(L, 1);
char *s2;
unsigned long n;
luaL_arg_check(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, n);
return 1;
}
}
}
lua_pushnil(L); /* else not a number */
return 1;
}
static int luaB_error (lua_State *L) {
lua_error(L, luaL_opt_string(L, 1, NULL));
return 0; /* to avoid warnings */
}
static int luaB_metatable (lua_State *L) {
luaL_check_any(L, 1);
if (lua_isnone(L, 2)) {
if (!lua_getmetatable(L, 1))
return 0; /* no metatable */
else {
lua_pushliteral(L, "__metatable");
lua_rawget(L, -2);
if (lua_isnil(L, -1))
lua_pop(L, 1);
}
}
else {
int t = lua_type(L, 2);
luaL_check_type(L, 1, LUA_TTABLE);
luaL_arg_check(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil/table expected");
lua_settop(L, 2);
lua_setmetatable(L, 1);
}
return 1;
}
static int luaB_globals (lua_State *L) {
lua_getglobals(L); /* value to be returned */
if (!lua_isnone(L, 1)) {
luaL_check_type(L, 1, LUA_TTABLE);
lua_pushvalue(L, 1); /* new table of globals */
lua_setglobals(L);
}
return 1;
}
static int luaB_rawget (lua_State *L) {
luaL_check_type(L, 1, LUA_TTABLE);
luaL_check_any(L, 2);
lua_rawget(L, 1);
return 1;
}
static int luaB_rawset (lua_State *L) {
luaL_check_type(L, 1, LUA_TTABLE);
luaL_check_any(L, 2);
luaL_check_any(L, 3);
lua_rawset(L, 1);
return 1;
}
static int luaB_gcinfo (lua_State *L) {
lua_pushnumber(L, lua_getgccount(L));
lua_pushnumber(L, lua_getgcthreshold(L));
return 2;
}
static int luaB_collectgarbage (lua_State *L) {
lua_setgcthreshold(L, luaL_opt_int(L, 1, 0));
return 0;
}
static int luaB_type (lua_State *L) {
luaL_check_any(L, 1);
lua_pushstring(L, lua_typename(L, lua_type(L, 1)));
return 1;
}
static int luaB_next (lua_State *L) {
luaL_check_type(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 passresults (lua_State *L, int status, int oldtop) {
if (status == 0) {
int nresults = lua_gettop(L) - oldtop;
if (nresults > 0)
return nresults; /* results are already on the stack */
else {
lua_pushboolean(L, 1); /* at least one result to signal no errors */
return 1;
}
}
else { /* error */
lua_pushnil(L);
lua_pushstring(L, luaL_errstr(status)); /* error code */
return 2;
}
}
static int luaB_dostring (lua_State *L) {
int oldtop = lua_gettop(L);
size_t l;
const char *s = luaL_check_lstr(L, 1, &l);
const char *chunkname = luaL_opt_string(L, 2, s);
return passresults(L, lua_dobuffer(L, s, l, chunkname), oldtop);
}
static int luaB_loadstring (lua_State *L) {
int oldtop = lua_gettop(L);
size_t l;
const char *s = luaL_check_lstr(L, 1, &l);
const char *chunkname = luaL_opt_string(L, 2, s);
return passresults(L, lua_loadbuffer(L, s, l, chunkname), oldtop);
}
static int luaB_dofile (lua_State *L) {
int oldtop = lua_gettop(L);
const char *fname = luaL_opt_string(L, 1, NULL);
return passresults(L, lua_dofile(L, fname), oldtop);
}
static int luaB_loadfile (lua_State *L) {
int oldtop = lua_gettop(L);
const char *fname = luaL_opt_string(L, 1, NULL);
return passresults(L, lua_loadfile(L, fname), oldtop);
}
static int luaB_assert (lua_State *L) {
luaL_check_any(L, 1);
if (!lua_toboolean(L, 1))
luaL_verror(L, "assertion failed! %.90s", luaL_opt_string(L, 2, ""));
lua_settop(L, 1);
return 1;
}
#define LUA_PATH "LUA_PATH"
#define LUA_PATH_SEP ";"
#ifndef LUA_PATH_DEFAULT
#define LUA_PATH_DEFAULT "./"
#endif
static int luaB_require (lua_State *L) {
const char *path;
luaL_check_string(L, 1);
lua_settop(L, 1);
lua_getglobal(L, LUA_PATH); /* get path */
if (lua_isstring(L, 2)) /* is LUA_PATH defined? */
path = lua_tostring(L, 2);
else { /* LUA_PATH not defined */
lua_pop(L, 1); /* pop old global value */
path = getenv(LUA_PATH); /* try environment variable */
if (path == NULL) path = LUA_PATH_DEFAULT; /* else use default */
lua_pushstring(L, path);
lua_pushvalue(L, -1); /* duplicate to leave a copy on stack */
lua_setglobal(L, LUA_PATH);
}
lua_pushvalue(L, 1); /* check package's name in book-keeping table */
lua_gettable(L, lua_upvalueindex(1));
if (!lua_isnil(L, -1)) /* is it there? */
return 0; /* package is already loaded */
else { /* must load it */
for (;;) { /* traverse path */
int res;
int l = strcspn(path, LUA_PATH_SEP); /* find separator */
lua_pushlstring(L, path, l); /* directory name */
lua_pushvalue(L, 1); /* package name */
lua_concat(L, 2); /* concat directory with package name */
res = lua_dofile(L, lua_tostring(L, -1)); /* try to load it */
lua_settop(L, 2); /* pop string and eventual results from dofile */
if (res == 0) break; /* ok; file done */
else if (res != LUA_ERRFILE)
lua_error(L, NULL); /* error running package; propagate it */
if (*(path+l) == '\0') /* no more directories? */
luaL_verror(L, "could not load package `%.20s' from path `%.200s'",
lua_tostring(L, 1), lua_tostring(L, 2));
path += l+1; /* try next directory */
}
}
lua_pushvalue(L, 1);
lua_pushnumber(L, 1);
lua_settable(L, lua_upvalueindex(1)); /* mark it as loaded */
return 0;
}
static int aux_unpack (lua_State *L, int arg) {
int n, i;
luaL_check_type(L, arg, LUA_TTABLE);
n = lua_getn(L, arg);
luaL_check_stack(L, n, "table too big to unpack");
for (i=1; i<=n; i++) /* push arg[1...n] */
lua_rawgeti(L, arg, i);
return n;
}
static int luaB_unpack (lua_State *L) {
return aux_unpack(L, 1);
}
static int luaB_call (lua_State *L) {
int oldtop;
const char *options = luaL_opt_string(L, 3, "");
int err = 0; /* index of old error method */
int status;
int n;
if (!lua_isnone(L, 4)) { /* set new error method */
lua_getglobal(L, LUA_ERRORMESSAGE);
err = lua_gettop(L); /* get index */
lua_pushvalue(L, 4);
lua_setglobal(L, LUA_ERRORMESSAGE);
}
oldtop = lua_gettop(L); /* top before function-call preparation */
/* push function */
lua_pushvalue(L, 1);
n = aux_unpack(L, 2); /* push arg[1...n] */
status = lua_call(L, n, LUA_MULTRET);
if (err != 0) { /* restore old error method */
lua_pushvalue(L, err);
lua_setglobal(L, LUA_ERRORMESSAGE);
}
if (status != 0) { /* error in call? */
if (strchr(options, 'x'))
lua_pushnil(L); /* return nil to signal the error */
else
lua_error(L, NULL); /* propagate error without additional messages */
return 1;
}
if (strchr(options, 'p')) /* pack results? */
lua_error(L, "obsolete option `p' in `call'");
return lua_gettop(L) - oldtop; /* results are already on the stack */
}
static int luaB_tostring (lua_State *L) {
char buff[64];
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));
return 1;
case LUA_TSTRING:
lua_pushvalue(L, 1);
return 1;
case LUA_TBOOLEAN:
lua_pushstring(L, (lua_toboolean(L, 1) ? "true" : "false"));
return 1;
case LUA_TTABLE:
sprintf(buff, "table: %p", lua_topointer(L, 1));
break;
case LUA_TFUNCTION:
sprintf(buff, "function: %p", lua_topointer(L, 1));
break;
case LUA_TUSERDATA:
case LUA_TUDATAVAL:
sprintf(buff, "userdata: %p", lua_touserdata(L, 1));
break;
case LUA_TNIL:
lua_pushliteral(L, "nil");
return 1;
}
lua_pushstring(L, buff);
return 1;
}
static const luaL_reg base_funcs[] = {
{LUA_ALERT, luaB__ALERT},
{LUA_ERRORMESSAGE, luaB__ERRORMESSAGE},
{"error", luaB_error},
{"metatable", luaB_metatable},
{"globals", luaB_globals},
{"next", luaB_next},
{"print", luaB_print},
{"tonumber", luaB_tonumber},
{"tostring", luaB_tostring},
{"type", luaB_type},
{"assert", luaB_assert},
{"unpack", luaB_unpack},
{"rawget", luaB_rawget},
{"rawset", luaB_rawset},
{"call", luaB_call},
{"collectgarbage", luaB_collectgarbage},
{"gcinfo", luaB_gcinfo},
{"loadfile", luaB_loadfile},
{"loadstring", luaB_loadstring},
{"dofile", luaB_dofile},
{"dostring", luaB_dostring},
{NULL, NULL}
};
static void base_open (lua_State *L) {
lua_pushliteral(L, "_G");
lua_pushvalue(L, LUA_GLOBALSINDEX);
luaL_openlib(L, base_funcs, 0); /* open lib into global table */
lua_pushliteral(L, "_VERSION");
lua_pushliteral(L, LUA_VERSION);
lua_settable(L, -3); /* set global _VERSION */
lua_settable(L, -1); /* set global _G */
}
/*
** {======================================================
** Coroutine library
** =======================================================
*/
static int luaB_resume (lua_State *L) {
lua_State *co = (lua_State *)lua_getfrombox(L, lua_upvalueindex(1));
lua_settop(L, 0);
if (lua_resume(L, co) != 0)
lua_error(L, "error running co-routine");
return lua_gettop(L);
}
static int gc_coroutine (lua_State *L) {
lua_State *co = (lua_State *)lua_getfrombox(L, 1);
lua_closethread(L, co);
return 0;
}
static int luaB_coroutine (lua_State *L) {
lua_State *NL;
int ref;
int i;
int n = lua_gettop(L);
luaL_arg_check(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1), 1,
"Lua function expected");
NL = lua_newthread(L);
if (NL == NULL) lua_error(L, "unable to create new thread");
/* move function and arguments from L to NL */
for (i=0; i<n; i++) {
ref = lua_ref(L, 1);
lua_getref(NL, ref);
lua_insert(NL, 1);
lua_unref(L, ref);
}
lua_cobegin(NL, n-1);
lua_newpointerbox(L, NL);
lua_pushliteral(L, "Coroutine");
lua_rawget(L, LUA_REGISTRYINDEX);
lua_setmetatable(L, -2);
lua_pushcclosure(L, luaB_resume, 1);
return 1;
}
static int luaB_yield (lua_State *L) {
return lua_yield(L, lua_gettop(L));
}
static const luaL_reg co_funcs[] = {
{"create", luaB_coroutine},
{"yield", luaB_yield},
{NULL, NULL}
};
static void co_open (lua_State *L) {
luaL_opennamedlib(L, "co", co_funcs, 0);
/* create metatable for coroutines */
lua_pushliteral(L, "Coroutine");
lua_newtable(L);
lua_pushliteral(L, "__gc");
lua_pushcfunction(L, gc_coroutine);
lua_rawset(L, -3);
lua_rawset(L, LUA_REGISTRYINDEX);
}
/* }====================================================== */
/*
** {======================================================
** Auxiliar table-related functions
*/
static int luaB_foreachi (lua_State *L) {
int n, i;
luaL_check_type(L, 1, LUA_TTABLE);
luaL_check_type(L, 2, LUA_TFUNCTION);
n = lua_getn(L, 1);
for (i=1; i<=n; i++) {
lua_pushvalue(L, 2); /* function */
lua_pushnumber(L, i); /* 1st argument */
lua_rawgeti(L, 1, i); /* 2nd argument */
lua_rawcall(L, 2, 1);
if (!lua_isnil(L, -1))
return 1;
lua_pop(L, 1); /* remove nil result */
}
return 0;
}
static int luaB_foreach (lua_State *L) {
luaL_check_type(L, 1, LUA_TTABLE);
luaL_check_type(L, 2, LUA_TFUNCTION);
lua_pushnil(L); /* first key */
for (;;) {
if (lua_next(L, 1) == 0)
return 0;
lua_pushvalue(L, 2); /* function */
lua_pushvalue(L, -3); /* key */
lua_pushvalue(L, -3); /* value */
lua_rawcall(L, 2, 1);
if (!lua_isnil(L, -1))
return 1;
lua_pop(L, 2); /* remove value and result */
}
}
static void aux_setn (lua_State *L, int t, int n) {
lua_pushliteral(L, "n");
lua_pushnumber(L, n);
lua_rawset(L, t);
}
static int luaB_getn (lua_State *L) {
luaL_check_type(L, 1, LUA_TTABLE);
lua_pushnumber(L, lua_getn(L, 1));
return 1;
}
static int luaB_tinsert (lua_State *L) {
int v = lua_gettop(L); /* number of arguments */
int n, pos;
luaL_check_type(L, 1, LUA_TTABLE);
n = lua_getn(L, 1);
if (v == 2) /* called with only 2 arguments */
pos = n+1;
else {
v = 3; /* function may be called with more than 3 args */
pos = luaL_check_int(L, 2); /* 2nd argument is the position */
}
if (pos > n+1) n = pos-1;
aux_setn(L, 1, n+1); /* t.n = n+1 */
for (; n>=pos; n--) {
lua_rawgeti(L, 1, n);
lua_rawseti(L, 1, n+1); /* t[n+1] = t[n] */
}
lua_pushvalue(L, v);
lua_rawseti(L, 1, pos); /* t[pos] = v */
return 0;
}
static int luaB_tremove (lua_State *L) {
int pos, n;
luaL_check_type(L, 1, LUA_TTABLE);
n = lua_getn(L, 1);
pos = luaL_opt_int(L, 2, n);
if (n <= 0) return 0; /* table is `empty' */
aux_setn(L, 1, n-1); /* t.n = n-1 */
lua_rawgeti(L, 1, pos); /* result = t[pos] */
for ( ;pos<n; pos++) {
lua_rawgeti(L, 1, pos+1);
lua_rawseti(L, 1, pos); /* a[pos] = a[pos+1] */
}
lua_pushnil(L);
lua_rawseti(L, 1, n); /* t[n] = nil */
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) {
/* WARNING: the caller (auxsort) must ensure stack space */
if (!lua_isnoneornil(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_rawcall(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) lua_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) lua_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 luaB_sort (lua_State *L) {
int n;
luaL_check_type(L, 1, LUA_TTABLE);
n = lua_getn(L, 1);
if (!lua_isnone(L, 2)) /* is there a 2nd argument? */
luaL_check_type(L, 2, LUA_TFUNCTION);
lua_settop(L, 2); /* make sure there is two arguments */
auxsort(L, 1, n);
return 0;
}
/* }====================================================== */
static const luaL_reg array_funcs[] = {
{"foreach", luaB_foreach},
{"foreachi", luaB_foreachi},
{"getn", luaB_getn},
{"sort", luaB_sort},
{"insert", luaB_tinsert},
{"remove", luaB_tremove},
{NULL, NULL}
};
/* }====================================================== */
LUALIB_API int lua_baselibopen (lua_State *L) {
base_open(L);
co_open(L);
luaL_opennamedlib(L, "tab", array_funcs, 0);
/* `require' needs an empty table as upvalue */
lua_newtable(L);
lua_pushcclosure(L, luaB_require, 1);
lua_setglobal(L, "require");
return 0;
}
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