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lua/lbaselib.c

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/*
** $Id: lbaselib.c,v 1.72 2002/05/06 19:05:10 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);
putc('\n', stderr);
return 0;
}
/*
** Basic implementation of _ERRORMESSAGE.
** The library `liolib' redefines _ERRORMESSAGE for better error information.
*/
static int luaB__ERRORMESSAGE (lua_State *L) {
lua_Debug ar;
luaL_check_type(L, 1, LUA_TSTRING);
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) {
luaL_vstr(L, "\n <%s: line %d>", ar.short_src, ar.currentline);
lua_concat(L, 2);
}
}
lua_pushliteral(L, "\n");
lua_concat(L, 3);
return 1;
}
/*
** 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)
return luaL_verror(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_settop(L, 1);
return lua_errorobj(L);
}
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 luaB_nexti (lua_State *L) {
lua_Number i = lua_tonumber(L, 2);
luaL_check_type(L, 1, LUA_TTABLE);
if (i == 0 && lua_isnull(L, 2)) { /* `for' start? */
lua_getglobal(L, "nexti"); /* return generator, */
lua_pushvalue(L, 1); /* state, */
lua_pushnumber(L, 0); /* and initial value */
return 3;
}
else { /* `for' step */
i++; /* next value */
lua_pushnumber(L, i);
lua_rawgeti(L, 1, i);
return (lua_isnil(L, -1)) ? 0 : 2;
}
}
static int passresults (lua_State *L, int status) {
if (status == 0) return 1;
else {
lua_pushnil(L);
lua_insert(L, -2);
return 2;
}
}
static int luaB_loadstring (lua_State *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));
}
static int luaB_loadfile (lua_State *L) {
const char *fname = luaL_opt_string(L, 1, NULL);
return passresults(L, lua_loadfile(L, fname));
}
static int luaB_assert (lua_State *L) {
luaL_check_any(L, 1);
if (!lua_toboolean(L, 1))
return luaL_verror(L, "assertion failed! %s", luaL_opt_string(L, 2, ""));
lua_settop(L, 1);
return 1;
}
static int luaB_unpack (lua_State *L) {
int n, i;
luaL_check_type(L, 1, LUA_TTABLE);
n = lua_getn(L, 1);
luaL_check_stack(L, n+LUA_MINSTACK, "table too big to unpack");
for (i=1; i<=n; i++) /* push arg[1...n] */
lua_rawgeti(L, 1, i);
return n;
}
static int luaB_pcall (lua_State *L) {
int status;
luaL_check_any(L, 1);
luaL_check_any(L, 2);
status = lua_pcall(L, lua_gettop(L) - 2, LUA_MULTRET, 1);
if (status != 0)
return passresults(L, status);
else {
lua_pushboolean(L, 1);
lua_replace(L, 1);
return lua_gettop(L); /* return `true' + all results */
}
}
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;
}
/*
** {======================================================
** `require' function
** =======================================================
*/
/* name of global that holds table with loaded packages */
#define REQTAB "_LOADED"
/* name of global that holds the search path for packages */
#define LUA_PATH "LUA_PATH"
#ifndef LUA_PATH_SEP
#define LUA_PATH_SEP ';'
#endif
#ifndef LUA_PATH_DEFAULT
#define LUA_PATH_DEFAULT "?.lua"
#endif
static const char *getpath (lua_State *L) {
const char *path;
lua_getglobal(L, LUA_PATH); /* try global variable */
path = lua_tostring(L, -1);
lua_pop(L, 1);
if (path) return path;
path = getenv(LUA_PATH); /* else try environment variable */
if (path) return path;
return LUA_PATH_DEFAULT; /* else use default */
}
static const char *pushnextpath (lua_State *L, const char *path) {
const char *l;
if (*path == '\0') return NULL; /* no more pathes */
if (*path == LUA_PATH_SEP) path++; /* skip separator */
l = strchr(path, LUA_PATH_SEP); /* find next separator */
if (l == NULL) l = path+strlen(path);
lua_pushlstring(L, path, l - path); /* directory name */
return l;
}
static void pushcomposename (lua_State *L) {
const char *path = lua_tostring(L, -1);
const char *wild = strchr(path, '?');
if (wild == NULL) return; /* no wild char; path is the file name */
lua_pushlstring(L, path, wild - path);
lua_pushvalue(L, 1); /* package name */
lua_pushstring(L, wild + 1);
lua_concat(L, 3);
}
static int luaB_require (lua_State *L) {
const char *path;
int status = LUA_ERRFILE; /* not found (yet) */
luaL_check_string(L, 1);
lua_settop(L, 1);
lua_pushvalue(L, 1);
lua_setglobal(L, "_REQUIREDNAME");
lua_getglobal(L, REQTAB);
if (!lua_istable(L, 2)) return luaL_verror(L, REQTAB " is not a table");
path = getpath(L);
lua_pushvalue(L, 1); /* check package's name in book-keeping table */
lua_gettable(L, 2);
if (!lua_isnil(L, -1)) /* is it there? */
return 0; /* package is already loaded */
else { /* must load it */
while (status == LUA_ERRFILE) {
lua_settop(L, 3); /* reset stack position */
if ((path = pushnextpath(L, path)) == NULL) break;
pushcomposename(L);
status = lua_loadfile(L, lua_tostring(L, -1)); /* try to load it */
}
}
switch (status) {
case 0: {
lua_rawcall(L, 0, 0); /* run loaded module */
lua_pushvalue(L, 1);
lua_pushboolean(L, 1);
lua_settable(L, 2); /* mark it as loaded */
return 0;
}
case LUA_ERRFILE: { /* file not found */
return luaL_verror(L, "could not load package `%s' from path `%s'",
lua_tostring(L, 1), getpath(L));
}
default: {
return luaL_verror(L, "error loading package\n%s", lua_tostring(L, -1));
}
}
}
/* }====================================================== */
static const luaL_reg base_funcs[] = {
{LUA_ALERT, luaB__ALERT},
{"_ERRORMESSAGE", luaB__ERRORMESSAGE},
{"error", luaB_error},
{"metatable", luaB_metatable},
{"globals", luaB_globals},
{"next", luaB_next},
{"nexti", luaB_nexti},
{"print", luaB_print},
{"tonumber", luaB_tonumber},
{"tostring", luaB_tostring},
{"type", luaB_type},
{"assert", luaB_assert},
{"unpack", luaB_unpack},
{"rawget", luaB_rawget},
{"rawset", luaB_rawset},
{"pcall", luaB_pcall},
{"collectgarbage", luaB_collectgarbage},
{"gcinfo", luaB_gcinfo},
{"loadfile", luaB_loadfile},
{"loadstring", luaB_loadstring},
{"require", luaB_require},
{NULL, NULL}
};
/*
** {======================================================
** 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)
return lua_errorobj(L);
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) return luaL_verror(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);
}
/* }====================================================== */
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 */
}
LUALIB_API int lua_baselibopen (lua_State *L) {
base_open(L);
co_open(L);
lua_newtable(L);
lua_setglobal(L, REQTAB);
return 0;
}
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