mirror of
https://github.com/lua/lua
synced 2024-12-12 05:54:01 +03:00
669 lines
17 KiB
C
669 lines
17 KiB
C
/*
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** $Id: lbaselib.c,v 1.124 2003/02/27 11:52:30 roberto Exp roberto $
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** Basic library
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** See Copyright Notice in lua.h
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define lbaselib_c
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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/*
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** If your system does not support `stdout', you can just remove this function.
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** If you need, you can define your own `print' function, following this
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** model but changing `fputs' to put the strings at a proper place
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** (a console window or a log file, for instance).
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*/
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static int luaB_print (lua_State *L) {
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int n = lua_gettop(L); /* number of arguments */
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int i;
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lua_getglobal(L, "tostring");
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for (i=1; i<=n; i++) {
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const char *s;
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lua_pushvalue(L, -1); /* function to be called */
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lua_pushvalue(L, i); /* value to print */
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lua_call(L, 1, 1);
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s = lua_tostring(L, -1); /* get result */
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if (s == NULL)
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return luaL_error(L, "`tostring' must return a string to `print'");
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if (i>1) fputs("\t", stdout);
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fputs(s, stdout);
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lua_pop(L, 1); /* pop result */
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}
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fputs("\n", stdout);
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return 0;
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}
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static int luaB_tonumber (lua_State *L) {
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int base = luaL_optint(L, 2, 10);
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if (base == 10) { /* standard conversion */
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luaL_checkany(L, 1);
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if (lua_isnumber(L, 1)) {
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lua_pushnumber(L, lua_tonumber(L, 1));
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return 1;
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}
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}
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else {
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const char *s1 = luaL_checkstring(L, 1);
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char *s2;
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unsigned long n;
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luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
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n = strtoul(s1, &s2, base);
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if (s1 != s2) { /* at least one valid digit? */
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while (isspace((unsigned char)(*s2))) s2++; /* skip trailing spaces */
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if (*s2 == '\0') { /* no invalid trailing characters? */
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lua_pushnumber(L, n);
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return 1;
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}
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}
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}
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lua_pushnil(L); /* else not a number */
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return 1;
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}
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static int luaB_error (lua_State *L) {
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int level = luaL_optint(L, 2, 1);
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luaL_checkany(L, 1);
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if (!lua_isstring(L, 1) || level == 0)
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lua_pushvalue(L, 1); /* propagate error message without changes */
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else { /* add extra information */
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luaL_where(L, level);
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lua_pushvalue(L, 1);
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lua_concat(L, 2);
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}
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return lua_error(L);
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}
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static int luaB_getmetatable (lua_State *L) {
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luaL_checkany(L, 1);
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if (!lua_getmetatable(L, 1)) {
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lua_pushnil(L);
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return 1; /* no metatable */
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}
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luaL_getmetafield(L, 1, "__metatable");
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return 1; /* returns either __metatable field (if present) or metatable */
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}
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static int luaB_setmetatable (lua_State *L) {
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int t = lua_type(L, 2);
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luaL_checktype(L, 1, LUA_TTABLE);
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luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
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"nil or table expected");
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if (luaL_getmetafield(L, 1, "__metatable"))
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luaL_error(L, "cannot change a protected metatable");
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lua_settop(L, 2);
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lua_setmetatable(L, 1);
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return 1;
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}
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static void getfunc (lua_State *L) {
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if (lua_isfunction(L, 1)) lua_pushvalue(L, 1);
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else {
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lua_Debug ar;
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int level = luaL_optint(L, 1, 1);
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luaL_argcheck(L, level >= 0, 1, "level must be non-negative");
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if (lua_getstack(L, level, &ar) == 0)
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luaL_argerror(L, 1, "invalid level");
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lua_getinfo(L, "f", &ar);
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if (lua_isnil(L, -1))
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luaL_error(L, "no function environment for tail call at level %d",
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level);
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}
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}
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static int aux_getfenv (lua_State *L) {
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lua_getfenv(L, -1);
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lua_pushliteral(L, "__globals");
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lua_rawget(L, -2);
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return !lua_isnil(L, -1);
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}
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static int luaB_getfenv (lua_State *L) {
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getfunc(L);
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if (!aux_getfenv(L)) /* __globals not defined? */
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lua_pop(L, 1); /* remove it, to return real environment */
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return 1;
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}
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static int luaB_setfenv (lua_State *L) {
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luaL_checktype(L, 2, LUA_TTABLE);
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getfunc(L);
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if (aux_getfenv(L)) /* __globals defined? */
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luaL_error(L, "cannot change a protected global table");
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else
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lua_pop(L, 2); /* remove __globals and real environment table */
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lua_pushvalue(L, 2);
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if (lua_setfenv(L, -2) == 0)
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luaL_error(L, "cannot change environment of given function");
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return 0;
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}
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static int luaB_rawequal (lua_State *L) {
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luaL_checkany(L, 1);
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luaL_checkany(L, 2);
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lua_pushboolean(L, lua_rawequal(L, 1, 2));
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return 1;
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}
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static int luaB_rawget (lua_State *L) {
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luaL_checktype(L, 1, LUA_TTABLE);
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luaL_checkany(L, 2);
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lua_rawget(L, 1);
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return 1;
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}
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static int luaB_rawset (lua_State *L) {
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luaL_checktype(L, 1, LUA_TTABLE);
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luaL_checkany(L, 2);
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luaL_checkany(L, 3);
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lua_rawset(L, 1);
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return 1;
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}
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static int luaB_gcinfo (lua_State *L) {
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lua_pushnumber(L, lua_getgccount(L));
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lua_pushnumber(L, lua_getgcthreshold(L));
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return 2;
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}
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static int luaB_collectgarbage (lua_State *L) {
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lua_setgcthreshold(L, luaL_optint(L, 1, 0));
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return 0;
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}
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static int luaB_type (lua_State *L) {
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luaL_checkany(L, 1);
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lua_pushstring(L, lua_typename(L, lua_type(L, 1)));
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return 1;
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}
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static int luaB_next (lua_State *L) {
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luaL_checktype(L, 1, LUA_TTABLE);
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lua_settop(L, 2); /* create a 2nd argument if there isn't one */
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if (lua_next(L, 1))
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return 2;
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else {
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lua_pushnil(L);
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return 1;
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}
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}
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static int luaB_pairs (lua_State *L) {
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luaL_checktype(L, 1, LUA_TTABLE);
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lua_pushliteral(L, "next");
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lua_rawget(L, LUA_GLOBALSINDEX); /* return generator, */
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lua_pushvalue(L, 1); /* state, */
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lua_pushnil(L); /* and initial value */
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return 3;
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}
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static int luaB_ipairs (lua_State *L) {
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lua_Number i = lua_tonumber(L, 2);
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luaL_checktype(L, 1, LUA_TTABLE);
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if (i == 0 && lua_isnone(L, 2)) { /* `for' start? */
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lua_pushliteral(L, "ipairs");
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lua_rawget(L, LUA_GLOBALSINDEX); /* return generator, */
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lua_pushvalue(L, 1); /* state, */
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lua_pushnumber(L, 0); /* and initial value */
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return 3;
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}
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else { /* `for' step */
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i++; /* next value */
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lua_pushnumber(L, i);
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lua_rawgeti(L, 1, (int)i);
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return (lua_isnil(L, -1)) ? 0 : 2;
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}
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}
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static int load_aux (lua_State *L, int status) {
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if (status == 0) { /* OK? */
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lua_Debug ar;
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lua_getstack(L, 1, &ar);
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lua_getinfo(L, "f", &ar); /* get calling function */
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lua_getfenv(L, -1); /* get its environment */
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lua_setfenv(L, -3); /* set it as the environment of the new chunk */
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lua_pop(L, 1); /* remove calling function */
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return 1;
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}
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else {
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lua_pushnil(L);
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lua_insert(L, -2);
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return 2;
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}
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}
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static int luaB_loadstring (lua_State *L) {
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size_t l;
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const char *s = luaL_checklstring(L, 1, &l);
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const char *chunkname = luaL_optstring(L, 2, s);
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return load_aux(L, luaL_loadbuffer(L, s, l, chunkname));
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}
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static int luaB_loadfile (lua_State *L) {
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const char *fname = luaL_optstring(L, 1, NULL);
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return load_aux(L, luaL_loadfile(L, fname));
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}
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static int luaB_dofile (lua_State *L) {
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const char *fname = luaL_optstring(L, 1, NULL);
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int status = luaL_loadfile(L, fname);
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if (status != 0) lua_error(L);
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lua_call(L, 0, LUA_MULTRET);
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return lua_gettop(L) - 1;
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}
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static int luaB_assert (lua_State *L) {
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luaL_checkany(L, 1);
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if (!lua_toboolean(L, 1))
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return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));
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lua_settop(L, 1);
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return 1;
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}
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static int luaB_unpack (lua_State *L) {
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int n, i;
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luaL_checktype(L, 1, LUA_TTABLE);
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n = luaL_getn(L, 1);
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luaL_checkstack(L, n, "table too big to unpack");
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for (i=1; i<=n; i++) /* push arg[1...n] */
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lua_rawgeti(L, 1, i);
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return n;
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}
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static int luaB_pcall (lua_State *L) {
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int status;
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luaL_checkany(L, 1);
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status = lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0);
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lua_pushboolean(L, (status == 0));
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lua_insert(L, 1);
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return lua_gettop(L); /* return status + all results */
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}
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static int luaB_xpcall (lua_State *L) {
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int status;
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luaL_checkany(L, 2);
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lua_settop(L, 2);
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lua_insert(L, 1); /* put error function under function to be called */
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status = lua_pcall(L, 0, LUA_MULTRET, 1);
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lua_pushboolean(L, (status == 0));
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lua_replace(L, 1);
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return lua_gettop(L); /* return status + all results */
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}
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static int luaB_tostring (lua_State *L) {
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char buff[64];
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luaL_checkany(L, 1);
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if (luaL_callmeta(L, 1, "__tostring")) /* is there a metafield? */
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return 1; /* use its value */
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switch (lua_type(L, 1)) {
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case LUA_TNUMBER:
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lua_pushstring(L, lua_tostring(L, 1));
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return 1;
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case LUA_TSTRING:
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lua_pushvalue(L, 1);
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return 1;
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case LUA_TBOOLEAN:
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lua_pushstring(L, (lua_toboolean(L, 1) ? "true" : "false"));
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return 1;
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case LUA_TTABLE:
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sprintf(buff, "table: %p", lua_topointer(L, 1));
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break;
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case LUA_TFUNCTION:
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sprintf(buff, "function: %p", lua_topointer(L, 1));
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break;
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case LUA_TUSERDATA:
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case LUA_TLIGHTUSERDATA:
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sprintf(buff, "userdata: %p", lua_touserdata(L, 1));
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break;
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case LUA_TTHREAD:
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sprintf(buff, "thread: %p", (void *)lua_tothread(L, 1));
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break;
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case LUA_TNIL:
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lua_pushliteral(L, "nil");
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return 1;
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}
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lua_pushstring(L, buff);
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return 1;
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}
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static int luaB_newproxy (lua_State *L) {
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lua_settop(L, 1);
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lua_newuserdata(L, 0); /* create proxy */
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if (lua_toboolean(L, 1) == 0)
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return 1; /* no metatable */
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else if (lua_isboolean(L, 1)) {
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lua_newtable(L); /* create a new metatable `m' ... */
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lua_pushvalue(L, -1); /* ... and mark `m' as a valid metatable */
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lua_pushboolean(L, 1);
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lua_rawset(L, lua_upvalueindex(1)); /* weaktable[m] = true */
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}
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else {
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int validproxy = 0; /* to check if weaktable[metatable(u)] == true */
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if (lua_getmetatable(L, 1)) {
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lua_rawget(L, lua_upvalueindex(1));
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validproxy = lua_toboolean(L, -1);
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lua_pop(L, 1); /* remove value */
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}
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luaL_argcheck(L, validproxy, 1, "boolean or proxy expected");
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lua_getmetatable(L, 1); /* metatable is valid; get it */
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}
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lua_setmetatable(L, 2);
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return 1;
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}
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/*
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** {======================================================
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** `require' function
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** =======================================================
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*/
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/* name of global that holds table with loaded packages */
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#define REQTAB "_LOADED"
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/* name of global that holds the search path for packages */
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#define LUA_PATH "LUA_PATH"
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#ifndef LUA_PATH_SEP
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#define LUA_PATH_SEP ';'
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#endif
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#ifndef LUA_PATH_DEFAULT
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#define LUA_PATH_DEFAULT "?;?.lua"
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#endif
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static const char *getpath (lua_State *L) {
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const char *path;
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lua_getglobal(L, LUA_PATH); /* try global variable */
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path = lua_tostring(L, -1);
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lua_pop(L, 1);
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if (path) return path;
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path = getenv(LUA_PATH); /* else try environment variable */
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if (path) return path;
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return LUA_PATH_DEFAULT; /* else use default */
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}
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static const char *pushnextpath (lua_State *L, const char *path) {
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const char *l;
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if (*path == '\0') return NULL; /* no more paths */
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if (*path == LUA_PATH_SEP) path++; /* skip separator */
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l = strchr(path, LUA_PATH_SEP); /* find next separator */
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if (l == NULL) l = path+strlen(path);
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lua_pushlstring(L, path, l - path); /* directory name */
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return l;
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}
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static void pushcomposename (lua_State *L) {
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const char *path = lua_tostring(L, -1);
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const char *wild = strchr(path, '?');
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if (wild == NULL) return; /* no wild char; path is the file name */
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lua_pushlstring(L, path, wild - path);
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lua_pushvalue(L, 1); /* package name */
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lua_pushstring(L, wild + 1);
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lua_concat(L, 3);
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}
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static int luaB_require (lua_State *L) {
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const char *path;
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int status = LUA_ERRFILE; /* not found (yet) */
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luaL_checkstring(L, 1);
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lua_settop(L, 1);
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lua_getglobal(L, REQTAB);
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if (!lua_istable(L, 2)) return luaL_error(L, "`" REQTAB "' is not a table");
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path = getpath(L);
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lua_pushvalue(L, 1); /* check package's name in book-keeping table */
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lua_rawget(L, 2);
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if (lua_toboolean(L, -1)) /* is it there? */
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return 1; /* package is already loaded; return its result */
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else { /* must load it */
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while (status == LUA_ERRFILE) {
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lua_settop(L, 3); /* reset stack position */
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if ((path = pushnextpath(L, path)) == NULL) break;
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pushcomposename(L);
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status = luaL_loadfile(L, lua_tostring(L, -1)); /* try to load it */
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}
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}
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switch (status) {
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case 0: {
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lua_getglobal(L, "_REQUIREDNAME"); /* save previous name */
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lua_insert(L, -2); /* put it below function */
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lua_pushvalue(L, 1);
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lua_setglobal(L, "_REQUIREDNAME"); /* set new name */
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lua_call(L, 0, 1); /* run loaded module */
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lua_insert(L, -2); /* put result below previous name */
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lua_setglobal(L, "_REQUIREDNAME"); /* reset to previous name */
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if (lua_isnil(L, -1)) { /* no/nil return? */
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lua_pushboolean(L, 1);
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lua_replace(L, -2); /* replace to true */
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}
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lua_pushvalue(L, 1);
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lua_pushvalue(L, -2);
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lua_rawset(L, 2); /* mark it as loaded */
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return 1; /* return value */
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}
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case LUA_ERRFILE: { /* file not found */
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return luaL_error(L, "could not load package `%s' from path `%s'",
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lua_tostring(L, 1), getpath(L));
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}
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default: {
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return luaL_error(L, "error loading package\n%s", lua_tostring(L, -1));
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}
|
|
}
|
|
}
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
static const luaL_reg base_funcs[] = {
|
|
{"error", luaB_error},
|
|
{"getmetatable", luaB_getmetatable},
|
|
{"setmetatable", luaB_setmetatable},
|
|
{"getfenv", luaB_getfenv},
|
|
{"setfenv", luaB_setfenv},
|
|
{"next", luaB_next},
|
|
{"ipairs", luaB_ipairs},
|
|
{"pairs", luaB_pairs},
|
|
{"print", luaB_print},
|
|
{"tonumber", luaB_tonumber},
|
|
{"tostring", luaB_tostring},
|
|
{"type", luaB_type},
|
|
{"assert", luaB_assert},
|
|
{"unpack", luaB_unpack},
|
|
{"rawequal", luaB_rawequal},
|
|
{"rawget", luaB_rawget},
|
|
{"rawset", luaB_rawset},
|
|
{"pcall", luaB_pcall},
|
|
{"xpcall", luaB_xpcall},
|
|
{"collectgarbage", luaB_collectgarbage},
|
|
{"gcinfo", luaB_gcinfo},
|
|
{"loadfile", luaB_loadfile},
|
|
{"dofile", luaB_dofile},
|
|
{"loadstring", luaB_loadstring},
|
|
{"require", luaB_require},
|
|
{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");
|
|
lua_xmove(L, co, narg);
|
|
status = lua_resume(co, narg);
|
|
if (status == 0) {
|
|
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 {
|
|
lua_Debug ar;
|
|
if (lua_getstack(co, 0, &ar) == 0 && lua_gettop(co) == 0)
|
|
lua_pushliteral(L, "dead");
|
|
else
|
|
lua_pushliteral(L, "suspended");
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
static const luaL_reg co_funcs[] = {
|
|
{"create", luaB_cocreate},
|
|
{"wrap", luaB_cowrap},
|
|
{"resume", luaB_coresume},
|
|
{"yield", luaB_yield},
|
|
{"status", luaB_costatus},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
|
|
static void base_open (lua_State *L) {
|
|
lua_pushliteral(L, "_G");
|
|
lua_pushvalue(L, LUA_GLOBALSINDEX);
|
|
luaL_openlib(L, NULL, base_funcs, 0); /* open lib into global table */
|
|
lua_pushliteral(L, "_VERSION");
|
|
lua_pushliteral(L, LUA_VERSION);
|
|
lua_rawset(L, -3); /* set global _VERSION */
|
|
/* `newproxy' needs a weaktable as upvalue */
|
|
lua_pushliteral(L, "newproxy");
|
|
lua_newtable(L); /* new table `w' */
|
|
lua_pushvalue(L, -1); /* `w' will be its own metatable */
|
|
lua_setmetatable(L, -2);
|
|
lua_pushliteral(L, "__mode");
|
|
lua_pushliteral(L, "k");
|
|
lua_rawset(L, -3); /* metatable(w).__mode = "k" */
|
|
lua_pushcclosure(L, luaB_newproxy, 1);
|
|
lua_rawset(L, -3); /* set global `newproxy' */
|
|
lua_rawset(L, -1); /* set global _G */
|
|
}
|
|
|
|
|
|
LUALIB_API int lua_baselibopen (lua_State *L) {
|
|
base_open(L);
|
|
luaL_openlib(L, LUA_COLIBNAME, co_funcs, 0);
|
|
lua_newtable(L);
|
|
lua_setglobal(L, REQTAB);
|
|
return 0;
|
|
}
|
|
|