Python/pythonmain.c - platform/external/python/cpython3 - Gitiles

 /***********************************************************
 Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
 Netherlands.

                         All Rights Reserved

 Permission to use, copy, modify, and distribute this software and its
 documentation for any purpose and without fee is hereby granted,
 provided that the above copyright notice appear in all copies and that
 both that copyright notice and this permission notice appear in
 supporting documentation, and that the names of Stichting Mathematisch
 Centrum or CWI not be used in advertising or publicity pertaining to
 distribution of the software without specific, written prior permission.

 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 ******************************************************************/

 /* Python interpreter main program */

 #include "allobjects.h"

 #include "grammar.h"
 #include "node.h"
 #include "parsetok.h"
 #include "graminit.h"
 #include "errcode.h"
 #include "sysmodule.h"
 #include "compile.h"
 #include "ceval.h"
 #include "pythonrun.h"
 #include "import.h"

 extern char *getpythonpath();

 extern grammar gram; /* From graminit.c */

 int debugging; /* Needed by parser.c */
 int verbose; /* Needed by import.c */

 /* Interface to getopt(): */
 extern int optind;
 extern char *optarg;
 extern int getopt PROTO((int, char **, char *));

 main(argc, argv)
 	int argc;
 	char **argv;
 {
 	int c;
 	int sts;
 	char *command = NULL;
 	char *filename = NULL;
 	FILE *fp = stdin;

 	initargs(&argc, &argv); /* Defined in config*.c */

 	while ((c = getopt(argc, argv, "c:dv")) != EOF) {
 		if (c == 'c') {
 			/* -c is the last option; following arguments
 			   that look like options are left for the
 			   the command to interpret. */
 			command = malloc(strlen(optarg) + 2);
 			/* Ignore malloc errors this early... */
 			strcpy(command, optarg);
 			strcat(command, "\n");
 			break;
 		}

 		switch (c) {

 		case 'd':
 			debugging++;
 			break;

 		case 'v':
 			verbose++;
 			break;

 		/* This space reserved for other options */

 		default:
 			fprintf(stderr,
 				"usage: %s [-c cmd | file | -] [arg] ...\n",
 				argv[0]);
 			exit(2);
 			/*NOTREACHED*/

 		}
 	}

 	if (command == NULL && optind < argc && strcmp(argv[optind], "-") != 0)
 		filename = argv[optind];

 	if (filename != NULL) {
 		if ((fp = fopen(filename, "r")) == NULL) {
 			fprintf(stderr, "%s: can't open file '%s'\n",
 				argv[0], filename);
 			exit(2);
 		}
 	}

 	initall(); /* Defined in config*.c */

 	setpythonpath(getpythonpath());
 	if (command != NULL) {
 		/* Backup optind and force sys.argv[0] = '-c' */
 		optind--;
 		argv[optind] = "-c";
 	}
 	setpythonargv(argc-optind, argv+optind);

 	if (command) {
 		sts = run_command(command) != 0;
 	}
 	else {
 		sts = run(fp, filename == NULL ? "<stdin>" : filename) != 0;
 	}

 	goaway(sts);
 	/*NOTREACHED*/
 }

 /* Initialize all */

 void
 initall()
 {
 	static int inited;

 	if (inited)
 		return;
 	inited = 1;

 	initimport();

 	/* Modules 'builtin' and 'sys' are initialized here,
 	   they are needed by random bits of the interpreter.
 	   All other modules are optional and should be initialized
 	   by the initcalls() of a specific configuration. */

 	initbuiltin(); /* Also initializes builtin exceptions */
 	initsys();

 	initcalls(); /* Configuration-dependent initializations */

 	initintr(); /* For intrcheck() */
 }

 /* Parse input from a file and execute it */

 int
 run(fp, filename)
 	FILE *fp;
 	char *filename;
 {
 	if (filename == NULL)
 		filename = "???";
 	if (isatty((int)fileno(fp)))
 		return run_tty_loop(fp, filename);
 	else
 		return run_script(fp, filename);
 }

 int
 run_tty_loop(fp, filename)
 	FILE *fp;
 	char *filename;
 {
 	object *v;
 	int ret;
 	v = sysget("ps1");
 	if (v == NULL) {
 		sysset("ps1", v = newstringobject(">>> "));
 		XDECREF(v);
 	}
 	v = sysget("ps2");
 	if (v == NULL) {
 		sysset("ps2", v = newstringobject("... "));
 		XDECREF(v);
 	}
 	for (;;) {
 		ret = run_tty_1(fp, filename);
 #ifdef REF_DEBUG
 		fprintf(stderr, "[%ld refs]\n", ref_total);
 #endif
 		if (ret == E_EOF)
 			return 0;
 		/*
 		if (ret == E_NOMEM)
 			return -1;
 		*/
 	}
 }

 int
 run_tty_1(fp, filename)
 	FILE *fp;
 	char *filename;
 {
 	object *m, *d, *v, *w;
 	node *n;
 	char *ps1, *ps2;
 	int err;
 	v = sysget("ps1");
 	w = sysget("ps2");
 	if (v != NULL && is_stringobject(v)) {
 		INCREF(v);
 		ps1 = getstringvalue(v);
 	}
 	else {
 		v = NULL;
 		ps1 = "";
 	}
 	if (w != NULL && is_stringobject(w)) {
 		INCREF(w);
 		ps2 = getstringvalue(w);
 	}
 	else {
 		w = NULL;
 		ps2 = "";
 	}
 	err = parsefile(fp, filename, &gram, single_input, ps1, ps2, &n);
 	XDECREF(v);
 	XDECREF(w);
 	if (err == E_EOF)
 		return E_EOF;
 	if (err != E_DONE) {
 		err_input(err);
 		print_error();
 		return err;
 	}
 	m = add_module("__main__");
 	if (m == NULL)
 		return -1;
 	d = getmoduledict(m);
 	v = run_node(n, filename, d, d);
 	flushline();
 	if (v == NULL) {
 		print_error();
 		return -1;
 	}
 	DECREF(v);
 	return 0;
 }

 int
 run_script(fp, filename)
 	FILE *fp;
 	char *filename;
 {
 	object *m, *d, *v;
 	m = add_module("__main__");
 	if (m == NULL)
 		return -1;
 	d = getmoduledict(m);
 	v = run_file(fp, filename, file_input, d, d);
 	flushline();
 	if (v == NULL) {
 		print_error();
 		return -1;
 	}
 	DECREF(v);
 	return 0;
 }

 int
 run_command(command)
 	char *command;
 {
 	object *m, *d, *v;
 	m = add_module("__main__");
 	if (m == NULL)
 		return -1;
 	d = getmoduledict(m);
 	v = run_string(command, file_input, d, d);
 	flushline();
 	if (v == NULL) {
 		print_error();
 		return -1;
 	}
 	DECREF(v);
 	return 0;
 }

 void
 print_error()
 {
 	object *exception, *v;
 	err_get(&exception, &v);
 	if (exception == SystemExit) {
 		if (v == NULL || v == None)
 			goaway(0);
 		if (is_intobject(v))
 			goaway((int)getintvalue(v));
 		else {
 			printobject(v, stderr, PRINT_RAW);
 			fprintf(stderr, "\n");
 			goaway(1);
 		}
 	}
 	sysset("last_type", exception);
 	sysset("last_value", v);
 	if (printobject(exception, stderr, PRINT_RAW) != 0)
 		err_clear();
 	if (v != NULL && v != None) {
 		fprintf(stderr, ": ");
 		if (printobject(v, stderr, PRINT_RAW) != 0)
 			err_clear();
 	}
 	fprintf(stderr, "\n");
 	XDECREF(exception);
 	XDECREF(v);
 	printtraceback(stderr);
 }

 object *
 run_string(str, start, globals, locals)
 	char *str;
 	int start;
 	/*dict*/object *globals, *locals;
 {
 	node *n;
 	int err;
 	err = parse_string(str, start, &n);
 	return run_err_node(err, n, "<string>", globals, locals);
 }

 object *
 run_file(fp, filename, start, globals, locals)
 	FILE *fp;
 	char *filename;
 	int start;
 	/*dict*/object *globals, *locals;
 {
 	node *n;
 	int err;
 	err = parse_file(fp, filename, start, &n);
 	return run_err_node(err, n, filename, globals, locals);
 }

 object *
 run_err_node(err, n, filename, globals, locals)
 	int err;
 	node *n;
 	char *filename;
 	/*dict*/object *globals, *locals;
 {
 	if (err != E_DONE) {
 		err_input(err);
 		return NULL;
 	}
 	return run_node(n, filename, globals, locals);
 }

 object *
 run_node(n, filename, globals, locals)
 	node *n;
 	char *filename;
 	/*dict*/object *globals, *locals;
 {
 	if (globals == NULL) {
 		globals = getglobals();
 		if (locals == NULL)
 			locals = getlocals();
 	}
 	else {
 		if (locals == NULL)
 			locals = globals;
 	}
 	return eval_node(n, filename, globals, locals);
 }

 object *
 eval_node(n, filename, globals, locals)
 	node *n;
 	char *filename;
 	object *globals;
 	object *locals;
 {
 	codeobject *co;
 	object *v;
 	co = compile(n, filename);
 	freetree(n);
 	if (co == NULL)
 		return NULL;
 	v = eval_code(co, globals, locals, (object *)NULL);
 	DECREF(co);
 	return v;
 }

 /* Simplified interface to parsefile */

 int
 parse_file(fp, filename, start, n_ret)
 	FILE *fp;
 	char *filename;
 	int start;
 	node **n_ret;
 {
 	return parsefile(fp, filename, &gram, start,
 				(char *)0, (char *)0, n_ret);
 }

 /* Simplified interface to parsestring */

 int
 parse_string(str, start, n_ret)
 	char *str;
 	int start;
 	node **n_ret;
 {
 	int err = parsestring(str, &gram, start, n_ret);
 	/* Don't confuse early end of string with early end of input */
 	if (err == E_EOF)
 		err = E_SYNTAX;
 	return err;
 }

 /* Print fatal error message and abort */

 void
 fatal(msg)
 	char *msg;
 {
 	fprintf(stderr, "Fatal error: %s\n", msg);
 	abort();
 }

 /* Clean up and exit */

 void
 goaway(sts)
 	int sts;
 {
 	flushline();

 	/* XXX Call doneimport() before donecalls(), since donecalls()
 	   calls wdone(), and doneimport() may close windows */
 	doneimport();
 	donecalls();

 	err_clear();

 #ifdef REF_DEBUG
 	fprintf(stderr, "[%ld refs]\n", ref_total);
 #endif

 #ifdef TRACE_REFS
 	if (askyesno("Print left references?")) {
 		printrefs(stderr);
 	}
 #endif /* TRACE_REFS */

 	exit(sts);
 	/*NOTREACHED*/
 }

 #ifdef TRACE_REFS
 /* Ask a yes/no question */

 static int
 askyesno(prompt)
 	char *prompt;
 {
 	char buf[256];

 	printf("%s [ny] ", prompt);
 	if (fgets(buf, sizeof buf, stdin) == NULL)
 		return 0;
 	return buf[0] == 'y' || buf[0] == 'Y';
 }
 #endif

 #ifdef applec /* MPW (also usable for Think C 3.0) */

 /* Check for file descriptor connected to interactive device.
    Pretend that stdin is always interactive, other files never. */

 int
 isatty(fd)
 	int fd;
 {
 	return fd == fileno(stdin);
 }

 #endif
	/***********************************************************
	Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
	Netherlands.

	All Rights Reserved

	Permission to use, copy, modify, and distribute this software and its
	documentation for any purpose and without fee is hereby granted,
	provided that the above copyright notice appear in all copies and that
	both that copyright notice and this permission notice appear in
	supporting documentation, and that the names of Stichting Mathematisch
	Centrum or CWI not be used in advertising or publicity pertaining to
	distribution of the software without specific, written prior permission.

	STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
	THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
	FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
	FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
	OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

	******************************************************************/

	/* Python interpreter main program */

	#include "allobjects.h"

	#include "grammar.h"
	#include "node.h"
	#include "parsetok.h"
	#include "graminit.h"
	#include "errcode.h"
	#include "sysmodule.h"
	#include "compile.h"
	#include "ceval.h"
	#include "pythonrun.h"
	#include "import.h"

	extern char *getpythonpath();

	extern grammar gram; /* From graminit.c */

	int debugging; /* Needed by parser.c */
	int verbose; /* Needed by import.c */

	/* Interface to getopt(): */
	extern int optind;
	extern char *optarg;
	extern int getopt PROTO((int, char *, char ));

	main(argc, argv)
	int argc;
	char **argv;
	{
	int c;
	int sts;
	char *command = NULL;
	char *filename = NULL;
	FILE *fp = stdin;

	initargs(&argc, &argv); /* Defined in config.c /

	while ((c = getopt(argc, argv, "c:dv")) != EOF) {
	if (c == 'c') {
	/* -c is the last option; following arguments
	that look like options are left for the
	the command to interpret. */
	command = malloc(strlen(optarg) + 2);
	/* Ignore malloc errors this early... */
	strcpy(command, optarg);
	strcat(command, "\n");
	break;
	}

	switch (c) {

	case 'd':
	debugging++;
	break;

	case 'v':
	verbose++;
	break;

	/* This space reserved for other options */

	default:
	fprintf(stderr,
	"usage: %s [-c cmd \| file \| -] [arg] ...\n",
	argv[0]);
	exit(2);
	/NOTREACHED/

	}
	}

	if (command == NULL && optind < argc && strcmp(argv[optind], "-") != 0)
	filename = argv[optind];

	if (filename != NULL) {
	if ((fp = fopen(filename, "r")) == NULL) {
	fprintf(stderr, "%s: can't open file '%s'\n",
	argv[0], filename);
	exit(2);
	}
	}

	initall(); /* Defined in config.c /

	setpythonpath(getpythonpath());
	if (command != NULL) {
	/* Backup optind and force sys.argv[0] = '-c' */
	optind--;
	argv[optind] = "-c";
	}
	setpythonargv(argc-optind, argv+optind);

	if (command) {
	sts = run_command(command) != 0;
	}
	else {
	sts = run(fp, filename == NULL ? "<stdin>" : filename) != 0;
	}

	goaway(sts);
	/NOTREACHED/
	}

	/* Initialize all */

	void
	initall()
	{
	static int inited;

	if (inited)
	return;
	inited = 1;

	initimport();

	/* Modules 'builtin' and 'sys' are initialized here,
	they are needed by random bits of the interpreter.
	All other modules are optional and should be initialized
	by the initcalls() of a specific configuration. */

	initbuiltin(); /* Also initializes builtin exceptions */
	initsys();

	initcalls(); /* Configuration-dependent initializations */

	initintr(); /* For intrcheck() */
	}

	/* Parse input from a file and execute it */

	int
	run(fp, filename)
	FILE *fp;
	char *filename;
	{
	if (filename == NULL)
	filename = "???";
	if (isatty((int)fileno(fp)))
	return run_tty_loop(fp, filename);
	else
	return run_script(fp, filename);
	}

	int
	run_tty_loop(fp, filename)
	FILE *fp;
	char *filename;
	{
	object *v;
	int ret;
	v = sysget("ps1");
	if (v == NULL) {
	sysset("ps1", v = newstringobject(">>> "));
	XDECREF(v);
	}
	v = sysget("ps2");
	if (v == NULL) {
	sysset("ps2", v = newstringobject("... "));
	XDECREF(v);
	}
	for (;;) {
	ret = run_tty_1(fp, filename);
	#ifdef REF_DEBUG
	fprintf(stderr, "[%ld refs]\n", ref_total);
	#endif
	if (ret == E_EOF)
	return 0;
	/*
	if (ret == E_NOMEM)
	return -1;
	*/
	}
	}

	int
	run_tty_1(fp, filename)
	FILE *fp;
	char *filename;
	{
	object m, d, v, w;
	node *n;
	char ps1, ps2;
	int err;
	v = sysget("ps1");
	w = sysget("ps2");
	if (v != NULL && is_stringobject(v)) {
	INCREF(v);
	ps1 = getstringvalue(v);
	}
	else {
	v = NULL;
	ps1 = "";
	}
	if (w != NULL && is_stringobject(w)) {
	INCREF(w);
	ps2 = getstringvalue(w);
	}
	else {
	w = NULL;
	ps2 = "";
	}
	err = parsefile(fp, filename, &gram, single_input, ps1, ps2, &n);
	XDECREF(v);
	XDECREF(w);
	if (err == E_EOF)
	return E_EOF;
	if (err != E_DONE) {
	err_input(err);
	print_error();
	return err;
	}
	m = add_module("__main__");
	if (m == NULL)
	return -1;
	d = getmoduledict(m);
	v = run_node(n, filename, d, d);
	flushline();
	if (v == NULL) {
	print_error();
	return -1;
	}
	DECREF(v);
	return 0;
	}

	int
	run_script(fp, filename)
	FILE *fp;
	char *filename;
	{
	object m, d, *v;
	m = add_module("__main__");
	if (m == NULL)
	return -1;
	d = getmoduledict(m);
	v = run_file(fp, filename, file_input, d, d);
	flushline();
	if (v == NULL) {
	print_error();
	return -1;
	}
	DECREF(v);
	return 0;
	}

	int
	run_command(command)
	char *command;
	{
	object m, d, *v;
	m = add_module("__main__");
	if (m == NULL)
	return -1;
	d = getmoduledict(m);
	v = run_string(command, file_input, d, d);
	flushline();
	if (v == NULL) {
	print_error();
	return -1;
	}
	DECREF(v);
	return 0;
	}

	void
	print_error()
	{
	object exception, v;
	err_get(&exception, &v);
	if (exception == SystemExit) {
	if (v == NULL \|\| v == None)
	goaway(0);
	if (is_intobject(v))
	goaway((int)getintvalue(v));
	else {
	printobject(v, stderr, PRINT_RAW);
	fprintf(stderr, "\n");
	goaway(1);
	}
	}
	sysset("last_type", exception);
	sysset("last_value", v);
	if (printobject(exception, stderr, PRINT_RAW) != 0)
	err_clear();
	if (v != NULL && v != None) {
	fprintf(stderr, ": ");
	if (printobject(v, stderr, PRINT_RAW) != 0)
	err_clear();
	}
	fprintf(stderr, "\n");
	XDECREF(exception);
	XDECREF(v);
	printtraceback(stderr);
	}

	object *
	run_string(str, start, globals, locals)
	char *str;
	int start;
	/dict/object globals, locals;
	{
	node *n;
	int err;
	err = parse_string(str, start, &n);
	return run_err_node(err, n, "<string>", globals, locals);
	}

	object *
	run_file(fp, filename, start, globals, locals)
	FILE *fp;
	char *filename;
	int start;
	/dict/object globals, locals;
	{
	node *n;
	int err;
	err = parse_file(fp, filename, start, &n);
	return run_err_node(err, n, filename, globals, locals);
	}

	object *
	run_err_node(err, n, filename, globals, locals)
	int err;
	node *n;
	char *filename;
	/dict/object globals, locals;
	{
	if (err != E_DONE) {
	err_input(err);
	return NULL;
	}
	return run_node(n, filename, globals, locals);
	}

	object *
	run_node(n, filename, globals, locals)
	node *n;
	char *filename;
	/dict/object globals, locals;
	{
	if (globals == NULL) {
	globals = getglobals();
	if (locals == NULL)
	locals = getlocals();
	}
	else {
	if (locals == NULL)
	locals = globals;
	}
	return eval_node(n, filename, globals, locals);
	}

	object *
	eval_node(n, filename, globals, locals)
	node *n;
	char *filename;
	object *globals;
	object *locals;
	{
	codeobject *co;
	object *v;
	co = compile(n, filename);
	freetree(n);
	if (co == NULL)
	return NULL;
	v = eval_code(co, globals, locals, (object *)NULL);
	DECREF(co);
	return v;
	}

	/* Simplified interface to parsefile */

	int
	parse_file(fp, filename, start, n_ret)
	FILE *fp;
	char *filename;
	int start;
	node **n_ret;
	{
	return parsefile(fp, filename, &gram, start,
	(char )0, (char )0, n_ret);
	}

	/* Simplified interface to parsestring */

	int
	parse_string(str, start, n_ret)
	char *str;
	int start;
	node **n_ret;
	{
	int err = parsestring(str, &gram, start, n_ret);
	/* Don't confuse early end of string with early end of input */
	if (err == E_EOF)
	err = E_SYNTAX;
	return err;
	}

	/* Print fatal error message and abort */

	void
	fatal(msg)
	char *msg;
	{
	fprintf(stderr, "Fatal error: %s\n", msg);
	abort();
	}

	/* Clean up and exit */

	void
	goaway(sts)
	int sts;
	{
	flushline();

	/* XXX Call doneimport() before donecalls(), since donecalls()
	calls wdone(), and doneimport() may close windows */
	doneimport();
	donecalls();

	err_clear();

	#ifdef REF_DEBUG
	fprintf(stderr, "[%ld refs]\n", ref_total);
	#endif

	#ifdef TRACE_REFS
	if (askyesno("Print left references?")) {
	printrefs(stderr);
	}
	#endif /* TRACE_REFS */

	exit(sts);
	/NOTREACHED/
	}

	#ifdef TRACE_REFS
	/* Ask a yes/no question */

	static int
	askyesno(prompt)
	char *prompt;
	{
	char buf[256];

	printf("%s [ny] ", prompt);
	if (fgets(buf, sizeof buf, stdin) == NULL)
	return 0;
	return buf[0] == 'y' \|\| buf[0] == 'Y';
	}
	#endif

	#ifdef applec /* MPW (also usable for Think C 3.0) */

	/* Check for file descriptor connected to interactive device.
	Pretend that stdin is always interactive, other files never. */

	int
	isatty(fd)
	int fd;
	{
	return fd == fileno(stdin);
	}

	#endif