mirror of
https://github.com/lua/lua.git
synced 2024-12-12 11:33:26 +08:00
374 lines
9.4 KiB
C
374 lines
9.4 KiB
C
/*
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** $Id: lua.c,v 1.138 2005/03/23 17:50:49 roberto Exp roberto $
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** Lua stand-alone interpreter
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** See Copyright Notice in lua.h
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*/
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#include <signal.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 lua_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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static lua_State *globalL = NULL;
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static const char *progname = LUA_PROGNAME;
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static void lstop (lua_State *L, lua_Debug *ar) {
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(void)ar; /* unused arg. */
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lua_sethook(L, NULL, 0, 0);
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luaL_error(L, "interrupted!");
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}
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static void laction (int i) {
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signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
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terminate process (default action) */
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lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
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}
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static void print_usage (void) {
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fprintf(stderr,
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"usage: %s [options] [script [args]].\n"
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"Available options are:\n"
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" - execute stdin as a file\n"
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" -e stat execute string `stat'\n"
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" -i enter interactive mode after executing `script'\n"
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" -l name require library `name'\n"
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" -v show version information\n"
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" -w control access to undefined globals\n"
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" -- stop handling options\n" ,
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progname);
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}
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static void l_message (const char *pname, const char *msg) {
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if (pname) fprintf(stderr, "%s: ", pname);
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fprintf(stderr, "%s\n", msg);
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}
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static int report (lua_State *L, int status) {
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if (status && !lua_isnil(L, -1)) {
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const char *msg = lua_tostring(L, -1);
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if (msg == NULL) msg = "(error object is not a string)";
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l_message(progname, msg);
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lua_pop(L, 1);
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}
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return status;
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}
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static int traceback (lua_State *L) {
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luaL_getfield(L, LUA_GLOBALSINDEX, "debug.traceback");
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if (!lua_isfunction(L, -1))
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lua_pop(L, 1);
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else {
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lua_pushvalue(L, 1); /* pass error message */
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lua_pushinteger(L, 2); /* skip this function and traceback */
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lua_call(L, 2, 1); /* call debug.traceback */
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}
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return 1;
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}
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static int docall (lua_State *L, int narg, int clear) {
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int status;
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int base = lua_gettop(L) - narg; /* function index */
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lua_pushcfunction(L, traceback); /* push traceback function */
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lua_insert(L, base); /* put it under chunk and args */
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signal(SIGINT, laction);
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status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
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signal(SIGINT, SIG_DFL);
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lua_remove(L, base); /* remove traceback function */
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return status;
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}
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static void print_version (void) {
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l_message(NULL, LUA_VERSION " " LUA_COPYRIGHT);
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}
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static int getargs (lua_State *L, char *argv[], int n) {
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int i, narg;
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for (i=n+1; argv[i]; i++) {
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luaL_checkstack(L, 1, "too many arguments to script");
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lua_pushstring(L, argv[i]);
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}
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narg = i-(n+1); /* number of arguments to the script (not to `lua.c') */
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lua_newtable(L);
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for (i=0; argv[i]; i++) {
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lua_pushstring(L, argv[i]);
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lua_rawseti(L, -2, i - n);
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}
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return narg;
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}
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static int dofile (lua_State *L, const char *name) {
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int status = luaL_loadfile(L, name) || docall(L, 0, 1);
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return report(L, status);
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}
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static int dostring (lua_State *L, const char *s, const char *name) {
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int status = luaL_loadbuffer(L, s, strlen(s), name) || docall(L, 0, 1);
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return report(L, status);
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}
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static int dolibrary (lua_State *L, const char *name) {
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lua_getglobal(L, "require");
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lua_pushstring(L, name);
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return report(L, lua_pcall(L, 1, 0, 0));
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}
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static const char *get_prompt (lua_State *L, int firstline) {
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const char *p;
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lua_pushstring(L, firstline ? "_PROMPT" : "_PROMPT2");
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lua_rawget(L, LUA_GLOBALSINDEX);
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p = lua_tostring(L, -1);
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if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
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lua_pop(L, 1); /* remove global */
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return p;
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}
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static int incomplete (lua_State *L, int status) {
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if (status == LUA_ERRSYNTAX &&
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strstr(lua_tostring(L, -1), "near `<eof>'") != NULL) {
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lua_pop(L, 1);
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return 1;
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}
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else
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return 0;
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}
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static int pushline (lua_State *L, int firstline) {
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char buffer[LUA_MAXINPUT];
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char *b = buffer;
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size_t l;
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const char *prmt = get_prompt(L, firstline);
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if (lua_readline(L, b, prmt) == 0)
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return 0; /* no input */
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l = strlen(b);
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if (l > 0 && b[l-1] == '\n') /* line ends with newline? */
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b[l-1] = '\0'; /* remove it */
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if (firstline && b[0] == '=') /* first line starts with `=' ? */
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lua_pushfstring(L, "return %s", b+1); /* change it to `return' */
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else
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lua_pushstring(L, b);
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lua_freeline(L, b);
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return 1;
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}
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static int loadline (lua_State *L) {
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int status;
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lua_settop(L, 0);
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if (!pushline(L, 1))
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return -1; /* no input */
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for (;;) { /* repeat until gets a complete line */
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status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin");
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if (!incomplete(L, status)) break; /* cannot try to add lines? */
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if (!pushline(L, 0)) /* no more input? */
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return -1;
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lua_pushliteral(L, "\n"); /* add a new line... */
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lua_insert(L, -2); /* ...between the two lines */
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lua_concat(L, 3); /* join them */
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}
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lua_saveline(L, 1);
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lua_remove(L, 1); /* remove line */
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return status;
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}
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static void dotty (lua_State *L) {
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int status;
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const char *oldprogname = progname;
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progname = NULL;
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print_version();
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while ((status = loadline(L)) != -1) {
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if (status == 0) status = docall(L, 0, 0);
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report(L, status);
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if (status == 0 && lua_gettop(L) > 0) { /* any result to print? */
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lua_getglobal(L, "print");
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lua_insert(L, 1);
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if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0)
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l_message(progname, lua_pushfstring(L, "error calling `print' (%s)",
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lua_tostring(L, -1)));
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}
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}
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lua_settop(L, 0); /* clear stack */
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fputs("\n", stdout);
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progname = oldprogname;
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}
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static int checkvar (lua_State *L) {
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const char *name = lua_tostring(L, 2);
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if (name)
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luaL_error(L, "attempt to access undefined variable `%s'", name);
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return 0;
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}
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#define clearinteractive(i) (*i &= 2)
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static int handle_argv (lua_State *L, char *argv[], int *interactive) {
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if (argv[1] == NULL) { /* no arguments? */
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*interactive = 0;
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if (lua_stdin_is_tty())
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dotty(L);
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else
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dofile(L, NULL); /* executes stdin as a file */
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}
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else { /* other arguments; loop over them */
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int i;
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for (i = 1; argv[i] != NULL; i++) {
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if (argv[i][0] != '-') break; /* not an option? */
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switch (argv[i][1]) { /* option */
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case '-': { /* `--' */
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if (argv[i][2] != '\0') {
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print_usage();
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return 1;
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}
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i++; /* skip this argument */
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goto endloop; /* stop handling arguments */
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}
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case '\0': {
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clearinteractive(interactive);
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dofile(L, NULL); /* executes stdin as a file */
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break;
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}
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case 'i': {
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*interactive = 2; /* force interactive mode after arguments */
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break;
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}
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case 'v': {
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clearinteractive(interactive);
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print_version();
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break;
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}
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case 'w': {
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if (lua_getmetatable(L, LUA_GLOBALSINDEX)) {
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lua_pushcfunction(L, checkvar);
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lua_setfield(L, -2, "__index");
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}
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break;
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}
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case 'e': {
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const char *chunk = argv[i] + 2;
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clearinteractive(interactive);
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if (*chunk == '\0') chunk = argv[++i];
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if (chunk == NULL) {
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print_usage();
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return 1;
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}
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if (dostring(L, chunk, "=(command line)") != 0)
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return 1;
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break;
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}
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case 'l': {
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const char *filename = argv[i] + 2;
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if (*filename == '\0') filename = argv[++i];
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if (filename == NULL) {
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print_usage();
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return 1;
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}
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if (dolibrary(L, filename))
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return 1; /* stop if file fails */
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break;
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}
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default: {
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clearinteractive(interactive);
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print_usage();
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return 1;
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}
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}
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} endloop:
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if (argv[i] != NULL) {
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const char *filename = argv[i];
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int narg = getargs(L, argv, i); /* collect arguments */
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int status;
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lua_setglobal(L, "arg");
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clearinteractive(interactive);
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status = luaL_loadfile(L, filename);
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lua_insert(L, -(narg+1));
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if (status == 0)
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status = docall(L, narg, 0);
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else
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lua_pop(L, narg);
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return report(L, status);
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}
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}
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return 0;
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}
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static int handle_luainit (lua_State *L) {
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const char *init = getenv("LUA_INIT");
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if (init == NULL) return 0; /* status OK */
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else if (init[0] == '@')
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return dofile(L, init+1);
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else
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return dostring(L, init, "=LUA_INIT");
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}
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struct Smain {
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int argc;
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char **argv;
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int status;
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};
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static int pmain (lua_State *L) {
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struct Smain *s = (struct Smain *)lua_touserdata(L, 1);
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int status;
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int interactive = 1;
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if (s->argv[0] && s->argv[0][0]) progname = s->argv[0];
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globalL = L;
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luaopen_stdlibs(L); /* open libraries */
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status = handle_luainit(L);
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if (status == 0) {
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status = handle_argv(L, s->argv, &interactive);
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if (status == 0 && interactive) dotty(L);
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}
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s->status = status;
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return 0;
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}
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int main (int argc, char *argv[]) {
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int status;
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struct Smain s;
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lua_State *L = lua_open(); /* create state */
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if (L == NULL) {
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l_message(argv[0], "cannot create state: not enough memory");
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return EXIT_FAILURE;
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}
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s.argc = argc;
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s.argv = argv;
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status = lua_cpcall(L, &pmain, &s);
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report(L, status);
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lua_close(L);
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return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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