mirror of https://github.com/lua/lua
398 lines
8.9 KiB
C
398 lines
8.9 KiB
C
/*
|
|
** $Id: lua.c,v 1.107 2002/11/11 13:28:06 roberto Exp roberto $
|
|
** Lua stand-alone interpreter
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "lua.h"
|
|
|
|
#include "lauxlib.h"
|
|
#include "lualib.h"
|
|
|
|
|
|
/*
|
|
** generic extra include file
|
|
*/
|
|
#ifdef LUA_USERCONFIG
|
|
#include LUA_USERCONFIG
|
|
#endif
|
|
|
|
|
|
#ifdef _POSIX_SOURCE
|
|
#include <unistd.h>
|
|
#else
|
|
static int isatty (int x) { return x==0; } /* assume stdin is a tty */
|
|
#endif
|
|
|
|
|
|
|
|
#ifndef PROMPT
|
|
#define PROMPT "> "
|
|
#endif
|
|
|
|
|
|
#ifndef PROMPT2
|
|
#define PROMPT2 ">> "
|
|
#endif
|
|
|
|
|
|
#ifndef lua_userinit
|
|
#define lua_userinit(L) openstdlibs(L)
|
|
#endif
|
|
|
|
|
|
#ifndef LUA_EXTRALIBS
|
|
#define LUA_EXTRALIBS /* empty */
|
|
#endif
|
|
|
|
|
|
static lua_State *L = NULL;
|
|
|
|
static const char *progname;
|
|
|
|
|
|
static lua_Hook old_hook = NULL;
|
|
static unsigned long old_mask = 0;
|
|
|
|
|
|
static const luaL_reg lualibs[] = {
|
|
{"baselib", lua_baselibopen},
|
|
{"tablib", lua_tablibopen},
|
|
{"iolib", lua_iolibopen},
|
|
{"strlib", lua_strlibopen},
|
|
{"mathlib", lua_mathlibopen},
|
|
{"dblib", lua_dblibopen},
|
|
/* add your libraries here */
|
|
LUA_EXTRALIBS
|
|
{NULL, NULL}
|
|
};
|
|
|
|
|
|
|
|
static void lstop (lua_State *l, lua_Debug *ar) {
|
|
(void)ar; /* unused arg. */
|
|
lua_sethook(l, old_hook, old_mask);
|
|
luaL_error(l, "interrupted!");
|
|
}
|
|
|
|
|
|
static void laction (int i) {
|
|
signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
|
|
terminate process (default action) */
|
|
old_hook = lua_gethook(L);
|
|
old_mask = lua_gethookmask(L);
|
|
lua_sethook(L, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT(1));
|
|
}
|
|
|
|
|
|
static void print_usage (void) {
|
|
fprintf(stderr,
|
|
"usage: %s [options] [script [args]].\n"
|
|
"Available options are:\n"
|
|
" - execute stdin as a file\n"
|
|
" -e stat execute string `stat'\n"
|
|
" -i enter interactive mode after executing `script'\n"
|
|
" -l name execute file `name'\n"
|
|
" -v print version information\n"
|
|
" -- stop handling options\n" ,
|
|
progname);
|
|
}
|
|
|
|
|
|
static void l_message (const char *pname, const char *msg) {
|
|
if (pname) fprintf(stderr, "%s: ", pname);
|
|
fprintf(stderr, "%s\n", msg);
|
|
}
|
|
|
|
|
|
static void report (int status) {
|
|
const char *msg;
|
|
if (status) {
|
|
msg = lua_tostring(L, -1);
|
|
if (msg == NULL) msg = "(error with no message)";
|
|
l_message(progname, msg);
|
|
lua_pop(L, 1);
|
|
}
|
|
}
|
|
|
|
|
|
static int lcall (int clear) {
|
|
int status;
|
|
int top = lua_gettop(L);
|
|
lua_getglobal(L, "_TRACEBACK"); /* get traceback function */
|
|
lua_insert(L, top); /* put it under chunk */
|
|
signal(SIGINT, laction);
|
|
status = lua_pcall(L, 0, LUA_MULTRET, -2);
|
|
signal(SIGINT, SIG_DFL);
|
|
lua_remove(L, top); /* remove traceback function */
|
|
if (status == 0 && clear)
|
|
lua_settop(L, top); /* remove eventual results */
|
|
return status;
|
|
}
|
|
|
|
|
|
static int l_panic (lua_State *l) {
|
|
(void)l;
|
|
l_message(progname, "unable to recover; exiting");
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void print_version (void) {
|
|
l_message(NULL, LUA_VERSION " " LUA_COPYRIGHT);
|
|
}
|
|
|
|
|
|
static void getargs (char *argv[], int n) {
|
|
int i;
|
|
lua_newtable(L);
|
|
for (i=0; argv[i]; i++) {
|
|
lua_pushnumber(L, i - n);
|
|
lua_pushstring(L, argv[i]);
|
|
lua_rawset(L, -3);
|
|
}
|
|
/* arg.n = maximum index in table `arg' */
|
|
lua_pushliteral(L, "n");
|
|
lua_pushnumber(L, i-n-1);
|
|
lua_rawset(L, -3);
|
|
}
|
|
|
|
|
|
static int docall (int status) {
|
|
if (status == 0) status = lcall(1);
|
|
report(status);
|
|
return status;
|
|
}
|
|
|
|
|
|
static int file_input (const char *name) {
|
|
return docall(luaL_loadfile(L, name));
|
|
}
|
|
|
|
|
|
static int dostring (const char *s, const char *name) {
|
|
return docall(luaL_loadbuffer(L, s, strlen(s), name));
|
|
}
|
|
|
|
|
|
/*
|
|
** this macro can be used by some `history' system to save lines
|
|
** read in manual input
|
|
*/
|
|
#ifndef lua_saveline
|
|
#define lua_saveline(L,line) /* empty */
|
|
#endif
|
|
|
|
|
|
/*
|
|
** this macro defines a function to show the prompt and reads the
|
|
** next line for manual input
|
|
*/
|
|
#ifndef lua_readline
|
|
#define lua_readline(L,prompt) readline(L,prompt)
|
|
|
|
/* maximum length of an input line */
|
|
#ifndef MAXINPUT
|
|
#define MAXINPUT 512
|
|
#endif
|
|
|
|
|
|
static int readline (lua_State *l, const char *prompt) {
|
|
static char buffer[MAXINPUT];
|
|
if (prompt) {
|
|
fputs(prompt, stdout);
|
|
fflush(stdout);
|
|
}
|
|
if (fgets(buffer, sizeof(buffer), stdin) == NULL)
|
|
return 0; /* read fails */
|
|
else {
|
|
lua_pushstring(l, buffer);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
static const char *get_prompt (int firstline) {
|
|
const char *p = NULL;
|
|
lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2");
|
|
p = lua_tostring(L, -1);
|
|
if (p == NULL) p = (firstline ? PROMPT : PROMPT2);
|
|
lua_pop(L, 1); /* remove global */
|
|
return p;
|
|
}
|
|
|
|
|
|
static int incomplete (int status) {
|
|
if (status == LUA_ERRSYNTAX &&
|
|
strstr(lua_tostring(L, -1), "near `<eof>'") != NULL) {
|
|
lua_pop(L, 1);
|
|
return 1;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int load_string (void) {
|
|
int status;
|
|
lua_settop(L, 0);
|
|
if (lua_readline(L, get_prompt(1)) == 0) /* no input? */
|
|
return -1;
|
|
if (lua_tostring(L, -1)[0] == '=') { /* line starts with `=' ? */
|
|
lua_pushfstring(L, "return %s", lua_tostring(L, -1)+1);/* `=' -> `return' */
|
|
lua_remove(L, -2); /* remove original line */
|
|
}
|
|
for (;;) { /* repeat until gets a complete line */
|
|
status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin");
|
|
if (!incomplete(status)) break; /* cannot try to add lines? */
|
|
if (lua_readline(L, get_prompt(0)) == 0) /* no more input? */
|
|
return -1;
|
|
lua_concat(L, lua_gettop(L)); /* join lines */
|
|
}
|
|
lua_saveline(L, lua_tostring(L, 1));
|
|
lua_remove(L, 1); /* remove line */
|
|
return status;
|
|
}
|
|
|
|
|
|
static void manual_input (void) {
|
|
int status;
|
|
const char *oldprogname = progname;
|
|
progname = NULL;
|
|
while ((status = load_string()) != -1) {
|
|
if (status == 0) status = lcall(0);
|
|
report(status);
|
|
if (status == 0 && lua_gettop(L) > 0) { /* any result to print? */
|
|
lua_getglobal(L, "print");
|
|
lua_insert(L, 1);
|
|
if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0)
|
|
l_message(progname, "error calling `print'");
|
|
}
|
|
}
|
|
lua_settop(L, 0); /* clear stack */
|
|
fputs("\n", stdout);
|
|
progname = oldprogname;
|
|
}
|
|
|
|
|
|
static int handle_argv (char *argv[], int *interactive) {
|
|
if (argv[1] == NULL) { /* no more arguments? */
|
|
if (isatty(0)) {
|
|
print_version();
|
|
manual_input();
|
|
}
|
|
else
|
|
file_input(NULL); /* executes stdin as a file */
|
|
}
|
|
else { /* other arguments; loop over them */
|
|
int i;
|
|
for (i = 1; argv[i] != NULL; i++) {
|
|
if (argv[i][0] != '-') break; /* not an option? */
|
|
switch (argv[i][1]) { /* option */
|
|
case '-': { /* `--' */
|
|
i++; /* skip this argument */
|
|
goto endloop; /* stop handling arguments */
|
|
}
|
|
case '\0': {
|
|
file_input(NULL); /* executes stdin as a file */
|
|
break;
|
|
}
|
|
case 'i': {
|
|
*interactive = 1;
|
|
break;
|
|
}
|
|
case 'v': {
|
|
print_version();
|
|
break;
|
|
}
|
|
case 'e': {
|
|
const char *chunk = argv[i] + 2;
|
|
if (*chunk == '\0') chunk = argv[++i];
|
|
if (chunk == NULL) {
|
|
print_usage();
|
|
return EXIT_FAILURE;
|
|
}
|
|
if (dostring(chunk, "=<command line>") != 0)
|
|
return EXIT_FAILURE;
|
|
break;
|
|
}
|
|
case 'l': {
|
|
const char *filename = argv[i] + 2;
|
|
if (*filename == '\0') filename = argv[++i];
|
|
if (filename == NULL) {
|
|
print_usage();
|
|
return EXIT_FAILURE;
|
|
}
|
|
if (file_input(filename))
|
|
return EXIT_FAILURE; /* stop if file fails */
|
|
break;
|
|
}
|
|
case 'c': {
|
|
l_message(progname, "option `-c' is deprecated");
|
|
break;
|
|
}
|
|
case 's': {
|
|
l_message(progname, "option `-s' is deprecated");
|
|
break;
|
|
}
|
|
default: {
|
|
print_usage();
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
} endloop:
|
|
if (argv[i] != NULL) {
|
|
const char *filename = argv[i];
|
|
getargs(argv, i); /* collect remaining arguments */
|
|
lua_setglobal(L, "arg");
|
|
return file_input(filename); /* stop scanning arguments */
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void openstdlibs (lua_State *l) {
|
|
const luaL_reg *lib = lualibs;
|
|
for (; lib->name; lib++) {
|
|
lib->func(l); /* open library */
|
|
lua_settop(l, 0); /* discard any results */
|
|
}
|
|
}
|
|
|
|
|
|
static int handle_luainit (void) {
|
|
const char *init = getenv("LUA_INIT");
|
|
if (init == NULL) return 0; /* status OK */
|
|
else if (init[0] == '@')
|
|
return file_input(init+1);
|
|
else
|
|
return dostring(init, "=LUA_INIT");
|
|
}
|
|
|
|
|
|
int main (int argc, char *argv[]) {
|
|
int status;
|
|
int interactive = 0;
|
|
(void)argc; /* to avoid warnings */
|
|
progname = argv[0];
|
|
L = lua_open(); /* create state */
|
|
lua_atpanic(L, l_panic);
|
|
lua_userinit(L); /* open libraries */
|
|
status = handle_luainit();
|
|
if (status != 0) return status;
|
|
status = handle_argv(argv, &interactive);
|
|
if (status == 0 && interactive) manual_input();
|
|
lua_close(L);
|
|
return status;
|
|
}
|
|
|