mirror of https://github.com/lua/lua
lots of janitor work (including comments) + 'arg' table created
before running any script + changes in the parameters and return of 'collectargs'
This commit is contained in:
Roberto Ierusalimschy
parent
355037528c
commit
23f0ff9517
378
lua.c
378
lua.c
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@ -1,5 +1,5 @@
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/*
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** $Id: lua.c,v 1.209 2014/02/05 14:22:55 roberto Exp roberto $
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** $Id: lua.c,v 1.210 2014/02/26 15:27:56 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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@ -103,17 +103,24 @@ static lua_State *globalL = NULL;
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static const char *progname = LUA_PROGNAME;
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/*
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** Hook set by signal function to stop the interpreter.
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*/
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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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lua_sethook(L, NULL, 0, 0); /* reset hook */
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luaL_error(L, "interrupted!");
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}
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/*
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** Function to be called at a C signal. Because a C signal cannot
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** just change a Lua state (as there is no proper syncronization),
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** this function only sets a hook that, when called, will stop the
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** interpreter.
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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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signal(i, SIG_DFL); /* if another SIGINT happens, terminate process */
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lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
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}
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@ -139,27 +146,23 @@ static void print_usage (const char *badoption) {
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}
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/*
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** Prints an error message, adding the program name in front of it
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** (if present)
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*/
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static void l_message (const char *pname, const char *msg) {
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if (pname) luai_writestringerror("%s: ", pname);
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luai_writestringerror("%s\n", msg);
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}
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/*
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** Check whether 'status' is not OK and, if so, prints the error
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** message on the top of the stack. Because this function can be called
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** unprotected, it only accepts actual strings as error messages. (A
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** coercion could raise a memory error.)
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*/
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static int report (lua_State *L, int status) {
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if (status != LUA_OK && !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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/* force a complete garbage collection in case of errors */
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lua_gc(L, LUA_GCCOLLECT, 0);
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}
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return status;
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}
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/* the next function is called unprotected, so it must avoid errors */
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static void finalreport (lua_State *L, int status) {
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if (status != LUA_OK) {
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const char *msg = (lua_type(L, -1) == LUA_TSTRING) ? lua_tostring(L, -1)
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: NULL;
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@ -167,31 +170,39 @@ static void finalreport (lua_State *L, int status) {
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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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/*
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** Message handler to be used to run all chunks
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*/
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static int msghandler (lua_State *L) {
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const char *msg = lua_tostring(L, 1);
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if (msg)
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luaL_traceback(L, L, msg, 1);
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else if (!lua_isnoneornil(L, 1)) { /* is there an error object? */
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if (msg) /* is error object a string? */
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luaL_traceback(L, L, msg, 1); /* use standard traceback */
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else if (!lua_isnoneornil(L, 1)) { /* non-string error object? */
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if (!luaL_callmeta(L, 1, "__tostring")) /* try its 'tostring' metamethod */
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lua_pushliteral(L, "(no error message)");
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}
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} /* else no error object, does nothing */
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return 1;
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}
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/*
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** Interface to 'lua_pcall', which sets appropriate message function
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** and C-signal handler. Used to run all chunks.
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*/
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static int docall (lua_State *L, int narg, int nres) {
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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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lua_pushcfunction(L, msghandler); /* push message handler */
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lua_insert(L, base); /* put it under function and args */
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globalL = L; /* to be available to 'laction' */
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signal(SIGINT, laction);
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signal(SIGINT, laction); /* set C-signal handler */
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status = lua_pcall(L, narg, nres, base);
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signal(SIGINT, SIG_DFL);
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lua_remove(L, base); /* remove traceback function */
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signal(SIGINT, SIG_DFL); /* reset C-signal handler */
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lua_remove(L, base); /* remove message handler from the stack */
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return status;
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}
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@ -202,38 +213,47 @@ static void print_version (void) {
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}
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static int getargs (lua_State *L, char **argv, int n) {
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int narg;
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int i;
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int argc = 0;
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while (argv[argc]) argc++; /* count total number of arguments */
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narg = argc - (n + 1); /* number of arguments to the script */
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luaL_checkstack(L, narg + 3, "too many arguments to script");
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for (i=n+1; i < argc; i++)
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/*
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** Create the 'arg' table, which stores all arguments from the
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** command line ('argv'). It should be aligned so that, at index 0,
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** it has 'argv[script]', which is the script name. The arguments
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** to the script (everything after 'script') go to positive indices;
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** other arguments (before the script name) go to negative indices.
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** If there is no script name, assume interpreter's name as base.
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*/
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static void createargtable (lua_State *L, char **argv, int argc, int script) {
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int i, narg;
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if (script == argc) script = 0; /* no script name? */
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narg = argc - (script + 1); /* number of positive indices */
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lua_createtable(L, narg, script + 1);
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for (i = 0; i < argc; i++) {
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lua_pushstring(L, argv[i]);
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lua_createtable(L, narg, n + 1);
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for (i=0; i < argc; i++) {
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lua_pushstring(L, argv[i]);
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lua_rawseti(L, -2, i - n);
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lua_rawseti(L, -2, i - script);
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}
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return narg;
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lua_setglobal(L, "arg");
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}
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static int dochunk (lua_State *L, int status) {
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if (status == LUA_OK) status = docall(L, 0, 0);
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return report(L, status);
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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);
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if (status == LUA_OK) status = docall(L, 0, 0);
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return report(L, status);
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return dochunk(L, luaL_loadfile(L, name));
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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);
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if (status == LUA_OK) status = docall(L, 0, 0);
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return report(L, status);
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return dochunk(L, luaL_loadbuffer(L, s, strlen(s), name));
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}
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/*
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** Calls 'require(name)' and stores the result in a global variable
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** with the given name.
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*/
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static int dolibrary (lua_State *L, const char *name) {
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int status;
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lua_getglobal(L, "require");
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@ -245,6 +265,9 @@ static int dolibrary (lua_State *L, const char *name) {
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}
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/*
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** Returns the string to be used as a prompt by the interpreter.
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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_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2");
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@ -257,6 +280,12 @@ static const char *get_prompt (lua_State *L, int firstline) {
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#define EOFMARK "<eof>"
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#define marklen (sizeof(EOFMARK)/sizeof(char) - 1)
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/*
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** Check whether 'status' signals a syntax error and the error
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** message at the top of the stack ends with the above mark for
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** incoplete statements.
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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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size_t lmsg;
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@ -270,7 +299,9 @@ static int incomplete (lua_State *L, int status) {
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}
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/* prompt the user, read a line, and push it into the Lua stack */
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/*
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** Prompt the user, read a line, and push it into the Lua stack.
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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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@ -292,8 +323,10 @@ static int pushline (lua_State *L, int firstline) {
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}
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/* try to compile line on the stack as 'return <line>'; on return, stack
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has either compiled chunk or original line (if compilation failed) */
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/*
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** Try to compile line on the stack as 'return <line>'; on return, stack
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** has either compiled chunk or original line (if compilation failed).
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*/
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static int addreturn (lua_State *L) {
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int status;
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size_t len; const char *line;
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@ -309,14 +342,16 @@ static int addreturn (lua_State *L) {
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}
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/* read multiple lines until a complete line */
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/*
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** Read multiple lines until a complete Lua statement
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*/
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static int multiline (lua_State *L) {
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for (;;) { /* repeat until gets a complete line */
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for (;;) { /* repeat until gets a complete statement */
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size_t len;
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const char *line = lua_tolstring(L, 1, &len); /* get what it has */
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int status = luaL_loadbuffer(L, line, len, "=stdin"); /* try it */
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if (!incomplete(L, status) || !pushline(L, 0))
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return status; /* cannot/should not try to add continuation line */
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return status; /* cannot or should not try to add continuation line */
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lua_pushliteral(L, "\n"); /* add newline... */
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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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@ -324,6 +359,12 @@ static int multiline (lua_State *L) {
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}
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/*
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** Read a line and try to load (compile) it first as an expression (by
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** adding "return " in front of it) and second as a statement. Return
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** the final status of load/call with the resulting function (if any)
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** in the top of the stack.
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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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@ -331,29 +372,43 @@ static int loadline (lua_State *L) {
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return -1; /* no input */
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if ((status = addreturn(L)) != LUA_OK) /* 'return ...' did not work? */
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status = multiline(L); /* try as command, maybe with continuation lines */
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lua_saveline(L, 1);
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lua_remove(L, 1); /* remove line */
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lua_saveline(L, 1); /* keep history */
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lua_remove(L, 1); /* remove line from the stack */
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lua_assert(lua_gettop(L) == 1);
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return status;
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}
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static void dotty (lua_State *L) {
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/*
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** Prints (calling the Lua 'print' function) any values on the stack
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*/
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static void l_print (lua_State *L) {
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int n = lua_gettop(L);
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if (n > 0) { /* any result to be printed? */
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luaL_checkstack(L, LUA_MINSTACK, "too many results 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, n, 0, 0) != LUA_OK)
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l_message(progname, lua_pushfstring(L,
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"error calling " LUA_QL("print") " (%s)",
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lua_tostring(L, -1)));
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}
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}
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/*
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** Do the REPL: repeatedly read (load) a line, evaluate (call) it, and
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** print any results.
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*/
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static void doREPL (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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progname = NULL; /* no 'progname' on errors in interactive mode */
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while ((status = loadline(L)) != -1) {
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if (status == LUA_OK) status = docall(L, 0, LUA_MULTRET);
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report(L, status);
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if (status == LUA_OK && lua_gettop(L) > 0) { /* any result to print? */
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luaL_checkstack(L, LUA_MINSTACK, "too many results 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) != LUA_OK)
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l_message(progname, lua_pushfstring(L,
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"error calling " LUA_QL("print") " (%s)",
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lua_tostring(L, -1)));
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}
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if (status == LUA_OK)
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status = docall(L, 0, LUA_MULTRET);
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if (status == LUA_OK) l_print(L);
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else report(L, status);
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}
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lua_settop(L, 0); /* clear stack */
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luai_writeline();
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@ -361,97 +416,109 @@ static void dotty (lua_State *L) {
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}
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/*
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** Push on the stack 'n' strings from 'argv'
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*/
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static void pushargs (lua_State *L, char **argv, int n) {
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int i;
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luaL_checkstack(L, n + 3, "too many arguments to script");
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for (i = 1; i < n; i++) /* skip 0 (the script name) */
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lua_pushstring(L, argv[i]);
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}
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static int handle_script (lua_State *L, char **argv, int n) {
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int status;
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const char *fname;
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int narg = getargs(L, argv, n); /* collect arguments */
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lua_setglobal(L, "arg");
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fname = argv[n];
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if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0)
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const char *fname = argv[0];
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if (strcmp(fname, "-") == 0 && strcmp(argv[-1], "--") != 0)
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fname = NULL; /* stdin */
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status = luaL_loadfile(L, fname);
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lua_insert(L, -(narg+1));
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if (status == LUA_OK)
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status = docall(L, narg, LUA_MULTRET);
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else
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lua_pop(L, narg);
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if (status == LUA_OK) {
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pushargs(L, argv, n); /* push arguments to script */
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status = docall(L, n - 1, LUA_MULTRET);
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}
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return report(L, status);
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}
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/* check that argument has no extra characters at the end */
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#define noextrachars(x) {if ((x)[2] != '\0') return -1;}
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/* bits of various argument indicators in 'args' */
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#define has_error 1 /* bad option */
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#define has_i 2 /* -i */
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#define has_v 4 /* -v */
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#define has_e 8 /* -e */
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#define has_E 16 /* -E */
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/* indices of various argument indicators in array args */
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#define has_i 0 /* -i */
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#define has_v 1 /* -v */
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#define has_e 2 /* -e */
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#define has_E 3 /* -E */
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#define num_has 4 /* number of 'has_*' */
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static int collectargs (char **argv, int *args) {
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/*
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** Traverses all arguments from 'argv', returning a mask with those
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** needed before running any Lua code (or an error code if it finds
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** any invalid argument). 'first' returns the first not-handled argument
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** (either the script name or a bad argument in case of error).
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*/
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static int collectargs (char **argv, int *first) {
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int args = 0;
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int i;
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for (i = 1; argv[i] != NULL; i++) {
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*first = i;
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if (argv[i][0] != '-') /* not an option? */
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return i;
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switch (argv[i][1]) { /* option */
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case '-':
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noextrachars(argv[i]);
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return (argv[i+1] != NULL ? i+1 : 0);
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case '\0':
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return i;
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return args; /* stop handling options */
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switch (argv[i][1]) { /* else check option */
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case '-': /* '--' */
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if (argv[i][2] != '\0') /* extra characters after '--'? */
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return has_error; /* invalid option */
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*first = i + 1;
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return args;
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case '\0': /* '-' */
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return args; /* script "name" is '-' */
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case 'E':
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args[has_E] = 1;
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if (argv[i][2] != '\0') /* extra characters after 1st? */
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return has_error; /* invalid option */
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args |= has_E;
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break;
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case 'i':
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noextrachars(argv[i]);
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args[has_i] = 1; /* go through */
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args |= has_i; /* goes through (-i implies -v) */
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case 'v':
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noextrachars(argv[i]);
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args[has_v] = 1;
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if (argv[i][2] != '\0') /* extra characters after 1st? */
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return has_error; /* invalid option */
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args |= has_v;
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break;
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case 'e':
|
||||
args[has_e] = 1; /* go through */
|
||||
args |= has_e; /* go through */
|
||||
case 'l': /* both options need an argument */
|
||||
if (argv[i][2] == '\0') { /* no concatenated argument? */
|
||||
i++; /* try next 'argv' */
|
||||
if (argv[i] == NULL || argv[i][0] == '-')
|
||||
return -(i - 1); /* no next argument or it is another option */
|
||||
return has_error; /* no next argument or it is another option */
|
||||
}
|
||||
break;
|
||||
default: /* invalid option; return its index... */
|
||||
return -i; /* ...as a negative value */
|
||||
default: /* invalid option */
|
||||
return has_error;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
*first = i; /* no script name */
|
||||
return args;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
** Processes options 'e' and 'l', which involve running Lua code.
|
||||
** Returns 0 if some code raises an error.
|
||||
*/
|
||||
static int runargs (lua_State *L, char **argv, int n) {
|
||||
int i;
|
||||
for (i = 1; i < n; i++) {
|
||||
lua_assert(argv[i][0] == '-');
|
||||
switch (argv[i][1]) { /* option */
|
||||
case 'e': {
|
||||
const char *chunk = argv[i] + 2;
|
||||
if (*chunk == '\0') chunk = argv[++i];
|
||||
lua_assert(chunk != NULL);
|
||||
if (dostring(L, chunk, "=(command line)") != LUA_OK)
|
||||
return 0;
|
||||
break;
|
||||
}
|
||||
case 'l': {
|
||||
const char *filename = argv[i] + 2;
|
||||
if (*filename == '\0') filename = argv[++i];
|
||||
lua_assert(filename != NULL);
|
||||
if (dolibrary(L, filename) != LUA_OK)
|
||||
return 0; /* stop if file fails */
|
||||
break;
|
||||
}
|
||||
default: break;
|
||||
int status;
|
||||
int option = argv[i][1];
|
||||
lua_assert(argv[i][0] == '-'); /* already checked */
|
||||
if (option == 'e' || option == 'l') {
|
||||
const char *extra = argv[i] + 2; /* both options need an argument */
|
||||
if (*extra == '\0') extra = argv[++i];
|
||||
lua_assert(extra != NULL);
|
||||
if (option == 'e')
|
||||
status = dostring(L, extra, "=(command line)");
|
||||
else
|
||||
status = dolibrary(L, extra);
|
||||
if (status != LUA_OK) return 0;
|
||||
}
|
||||
}
|
||||
return 1;
|
||||
|
|
@ -473,40 +540,44 @@ static int handle_luainit (lua_State *L) {
|
|||
}
|
||||
|
||||
|
||||
/*
|
||||
** Main body of stand-alone interpreter (to be called in protected mode).
|
||||
** Reads the options and handles them all.
|
||||
*/
|
||||
static int pmain (lua_State *L) {
|
||||
int argc = (int)lua_tointeger(L, 1);
|
||||
char **argv = (char **)lua_touserdata(L, 2);
|
||||
int script;
|
||||
int args[num_has];
|
||||
args[has_i] = args[has_v] = args[has_e] = args[has_E] = 0;
|
||||
int args = collectargs(argv, &script);
|
||||
luaL_checkversion(L); /* check that interpreter has correct version */
|
||||
if (argv[0] && argv[0][0]) progname = argv[0];
|
||||
script = collectargs(argv, args);
|
||||
if (script < 0) { /* invalid arg? */
|
||||
print_usage(argv[-script]);
|
||||
if (args == has_error) { /* bad arg? */
|
||||
print_usage(argv[script]); /* 'script' has index of bad arg. */
|
||||
return 0;
|
||||
}
|
||||
if (args[has_v]) print_version();
|
||||
if (args[has_E]) { /* option '-E'? */
|
||||
if (args & has_v) /* option '-v'? */
|
||||
print_version();
|
||||
if (args & has_E) { /* option '-E'? */
|
||||
lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */
|
||||
lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
|
||||
}
|
||||
/* open standard libraries */
|
||||
luaL_checkversion(L);
|
||||
lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
|
||||
luaL_openlibs(L); /* open libraries */
|
||||
lua_gc(L, LUA_GCRESTART, 0);
|
||||
if (!args[has_E] && handle_luainit(L) != LUA_OK)
|
||||
return 0; /* error running LUA_INIT */
|
||||
/* execute arguments -e and -l */
|
||||
if (!runargs(L, argv, (script > 0) ? script : argc)) return 0;
|
||||
/* execute main script (if there is one) */
|
||||
if (script && handle_script(L, argv, script) != LUA_OK) return 0;
|
||||
if (args[has_i]) /* -i option? */
|
||||
dotty(L);
|
||||
else if (script == 0 && !args[has_e] && !args[has_v]) { /* no arguments? */
|
||||
if (lua_stdin_is_tty()) {
|
||||
luaL_openlibs(L); /* open standard libraries */
|
||||
createargtable(L, argv, argc, script); /* create table 'arg' */
|
||||
if (!(args & has_E)) { /* no option '-E'? */
|
||||
if (handle_luainit(L) != LUA_OK) /* run LUA_INIT */
|
||||
return 0; /* error running LUA_INIT */
|
||||
}
|
||||
if (!runargs(L, argv, script)) /* execute arguments -e and -l */
|
||||
return 0; /* something failed */
|
||||
if (script < argc && /* execute main script (if there is one) */
|
||||
handle_script(L, argv + script, argc - script) != LUA_OK)
|
||||
return 0;
|
||||
if (args & has_i) /* -i option? */
|
||||
doREPL(L); /* do read-eval-print loop */
|
||||
else if (script == argc && !(args & (has_e | has_v))) { /* no arguments? */
|
||||
if (lua_stdin_is_tty()) { /* running in interactive mode? */
|
||||
print_version();
|
||||
dotty(L);
|
||||
doREPL(L); /* do read-eval-print loop */
|
||||
}
|
||||
else dofile(L, NULL); /* executes stdin as a file */
|
||||
}
|
||||
|
|
@ -522,13 +593,12 @@ int main (int argc, char **argv) {
|
|||
l_message(argv[0], "cannot create state: not enough memory");
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
/* call 'pmain' in protected mode */
|
||||
lua_pushcfunction(L, &pmain);
|
||||
lua_pushcfunction(L, &pmain); /* to call 'pmain' in protected mode */
|
||||
lua_pushinteger(L, argc); /* 1st argument */
|
||||
lua_pushlightuserdata(L, argv); /* 2nd argument */
|
||||
status = lua_pcall(L, 2, 1, 0);
|
||||
status = lua_pcall(L, 2, 1, 0); /* do the call */
|
||||
result = lua_toboolean(L, -1); /* get result */
|
||||
finalreport(L, status);
|
||||
report(L, status);
|
||||
lua_close(L);
|
||||
return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue