mirror of
https://github.com/lua/lua
synced 2024-12-14 23:02:38 +03:00
395 lines
9.0 KiB
C
395 lines
9.0 KiB
C
/*
|
|
** $Id: lua.c,v 1.92 2002/06/18 17:43:49 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 "luadebug.h"
|
|
#include "lualib.h"
|
|
|
|
|
|
#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
|
|
|
|
|
|
static lua_State *L = NULL;
|
|
|
|
static const char *progname;
|
|
|
|
|
|
static lua_Hook old_linehook = NULL;
|
|
static lua_Hook old_callhook = NULL;
|
|
|
|
|
|
static void lstop (void) {
|
|
lua_setlinehook(L, old_linehook);
|
|
lua_setcallhook(L, old_callhook);
|
|
luaL_error(L, "interrupted!");
|
|
}
|
|
|
|
|
|
static void laction (int i) {
|
|
signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
|
|
terminate process (default action) */
|
|
old_linehook = lua_setlinehook(L, (lua_Hook)lstop);
|
|
old_callhook = lua_setcallhook(L, (lua_Hook)lstop);
|
|
}
|
|
|
|
|
|
static void report (int status) {
|
|
if (status) {
|
|
if (status == LUA_ERRRUN) {
|
|
if (lua_isstring(L, -2) && lua_isstring(L, -1))
|
|
lua_concat(L, 2); /* concat error message and traceback */
|
|
else
|
|
lua_remove(L, -2); /* lease only traceback on stack */
|
|
}
|
|
lua_getglobal(L, "_ALERT");
|
|
if (lua_isfunction(L, -1)) {
|
|
lua_pushvalue(L, -2);
|
|
lua_pcall(L, 1, 0);
|
|
}
|
|
else {
|
|
lua_pop(L, 1);
|
|
fprintf(stderr, "%s", lua_tostring(L, -1));
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static int lcall (int clear) {
|
|
int status;
|
|
int top = lua_gettop(L);
|
|
signal(SIGINT, laction);
|
|
status = lua_pcall(L, 0, LUA_MULTRET);
|
|
signal(SIGINT, SIG_DFL);
|
|
if (status == 0 && clear)
|
|
lua_settop(L, top); /* remove eventual results */
|
|
return status;
|
|
}
|
|
|
|
|
|
static void print_usage (void) {
|
|
fprintf(stderr,
|
|
"usage: %s [options]. Available options are:\n"
|
|
" - execute stdin as a file\n"
|
|
" -c close Lua when exiting\n"
|
|
" -e stat execute string `stat'\n"
|
|
" -f name execute file `name' with remaining arguments in table `arg'\n"
|
|
" -i enter interactive mode\n"
|
|
" -v print version information\n"
|
|
" a=b set global `a' to string `b'\n"
|
|
" name execute file `name'\n",
|
|
progname);
|
|
}
|
|
|
|
|
|
static int l_panic (lua_State *l) {
|
|
(void)l;
|
|
fputs("unable to recover; exiting\n", stderr);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void print_version (void) {
|
|
printf("%.80s %.80s\n", LUA_VERSION, LUA_COPYRIGHT);
|
|
}
|
|
|
|
|
|
static void assign (const char *arg) {
|
|
char *eq = strchr(arg, '='); /* arg is `name=value'; find the `=' */
|
|
lua_pushlstring(L, arg, eq-arg); /* push name */
|
|
lua_pushstring(L, eq+1); /* push value */
|
|
lua_settable(L, LUA_GLOBALSINDEX); /* _G.name = value */
|
|
}
|
|
|
|
|
|
static void getargs (char *argv[]) {
|
|
int i;
|
|
lua_newtable(L);
|
|
for (i=0; argv[i]; i++) {
|
|
/* arg[i] = argv[i] */
|
|
lua_pushnumber(L, i);
|
|
lua_pushstring(L, argv[i]);
|
|
lua_rawset(L, -3);
|
|
}
|
|
/* arg.n = maximum index in table `arg' */
|
|
lua_pushliteral(L, "n");
|
|
lua_pushnumber(L, i-1);
|
|
lua_rawset(L, -3);
|
|
}
|
|
|
|
|
|
static int l_alert (lua_State *l) {
|
|
if (progname) fprintf(stderr, "%s: ", progname);
|
|
fprintf(stderr, "%s\n", luaL_check_string(l, 1));
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int l_getargs (lua_State *l) {
|
|
char **argv = (char **)lua_touserdata(l, lua_upvalueindex(1));
|
|
getargs(argv);
|
|
return 1;
|
|
}
|
|
|
|
|
|
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));
|
|
}
|
|
|
|
|
|
#ifdef USE_READLINE
|
|
#include <readline/readline.h>
|
|
#include <readline/history.h>
|
|
#define save_line(b) if (strcspn(b, " \t\n") != 0) add_history(b)
|
|
#define push_line(b) if (incomplete) lua_pushstring(L, "\n"); lua_pushstring(L, b); free(b)
|
|
#else
|
|
#define save_line(b)
|
|
#define push_line(b) lua_pushstring(L, b)
|
|
|
|
/* maximum length of an input line */
|
|
#ifndef MAXINPUT
|
|
#define MAXINPUT 512
|
|
#endif
|
|
|
|
|
|
static char *readline (const char *prompt) {
|
|
static char buffer[MAXINPUT];
|
|
if (prompt) {
|
|
fputs(prompt, stdout);
|
|
fflush(stdout);
|
|
}
|
|
return fgets(buffer, sizeof(buffer), stdin);
|
|
}
|
|
#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 firstline = 1;
|
|
int status;
|
|
lua_settop(L, 0);
|
|
do { /* repeat until gets a complete line */
|
|
char *buffer = readline(get_prompt(firstline));
|
|
if (buffer == NULL) { /* input end? */
|
|
lua_settop(L, 0);
|
|
return -1; /* input end */
|
|
}
|
|
if (firstline && buffer[0] == '=') {
|
|
buffer[0] = ' ';
|
|
lua_pushstring(L, "return");
|
|
}
|
|
firstline = 0;
|
|
push_line(buffer);
|
|
lua_concat(L, lua_gettop(L));
|
|
status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin");
|
|
} while (incomplete(status)); /* repeat loop to get rest of `line' */
|
|
save_line(lua_tostring(L, 1));
|
|
lua_remove(L, 1);
|
|
return status;
|
|
}
|
|
|
|
|
|
static void manual_input (int version) {
|
|
int status;
|
|
const char *oldprogname = progname;
|
|
progname = NULL;
|
|
if (version) print_version();
|
|
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);
|
|
lua_pcall(L, lua_gettop(L)-1, 0);
|
|
}
|
|
}
|
|
printf("\n");
|
|
progname = oldprogname;
|
|
}
|
|
|
|
|
|
static int handle_argv (char *argv[], int *toclose) {
|
|
if (*argv == NULL) { /* no more arguments? */
|
|
if (isatty(0)) {
|
|
manual_input(1);
|
|
}
|
|
else
|
|
file_input(NULL); /* executes stdin as a file */
|
|
}
|
|
else { /* other arguments; loop over them */
|
|
int i;
|
|
for (i = 0; argv[i] != NULL; i++) {
|
|
if (argv[i][0] != '-') { /* not an option? */
|
|
if (strchr(argv[i], '='))
|
|
assign(argv[i]);
|
|
else
|
|
if (file_input(argv[i]))
|
|
return EXIT_FAILURE; /* stop if file fails */
|
|
}
|
|
else switch (argv[i][1]) { /* option */
|
|
case '\0': {
|
|
file_input(NULL); /* executes stdin as a file */
|
|
break;
|
|
}
|
|
case 'i': {
|
|
manual_input(0);
|
|
break;
|
|
}
|
|
case 'c': {
|
|
*toclose = 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, "=prog. argument") != 0) {
|
|
fprintf(stderr, "%s: error running argument `%.99s'\n",
|
|
progname, chunk);
|
|
return EXIT_FAILURE;
|
|
}
|
|
break;
|
|
}
|
|
case 'f': {
|
|
const char *filename = argv[i] + 2;
|
|
if (*filename == '\0') filename = argv[++i];
|
|
if (filename == NULL) {
|
|
print_usage();
|
|
return EXIT_FAILURE;
|
|
}
|
|
getargs(argv+i); /* collect remaining arguments */
|
|
lua_setglobal(L, "arg");
|
|
return file_input(filename); /* stop scanning arguments */
|
|
}
|
|
case 's': {
|
|
fprintf(stderr,
|
|
"%s: option `-s' is deprecated (dynamic stack now)\n",
|
|
progname);
|
|
break;
|
|
}
|
|
default: {
|
|
print_usage();
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
|
|
static void register_own (char *argv[]) {
|
|
lua_pushudataval(L, argv);
|
|
lua_pushcclosure(L, l_getargs, 1);
|
|
lua_setglobal(L, "getargs");
|
|
lua_register(L, "_ALERT", l_alert);
|
|
}
|
|
|
|
|
|
static void openstdlibs (lua_State *l) {
|
|
lua_baselibopen(l);
|
|
lua_tablibopen(l);
|
|
lua_iolibopen(l);
|
|
lua_strlibopen(l);
|
|
lua_mathlibopen(l);
|
|
lua_dblibopen(l);
|
|
}
|
|
|
|
|
|
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 toclose = 0;
|
|
(void)argc; /* to avoid warnings */
|
|
progname = argv[0];
|
|
L = lua_open(); /* create state */
|
|
lua_atpanic(L, l_panic);
|
|
LUA_USERINIT(L); /* open libraries */
|
|
register_own(argv); /* create own function */
|
|
status = handle_luainit();
|
|
if (status != 0) return status;
|
|
status = handle_argv(argv+1, &toclose);
|
|
if (toclose)
|
|
lua_close(L);
|
|
return status;
|
|
}
|
|
|