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

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 "patchlevel.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 */

#ifdef DEBUG

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

#endif

/* 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:")) != 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) {

/* 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(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);

}

}

fprintf(stderr, "Unhandled exception: ");

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*/

}

static

finaloutput()

{

#ifdef TRACE_REFS

if (!askyesno("Print left references?"))

return;

printrefs(stderr);

#endif /* 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';

}

#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