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

Copyright 1991, 1992 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 top-level routines, including init/exit */

#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 "eval.h"

#include "ceval.h"

#include "pythonrun.h"

#include "import.h"

#ifdef unix

#define HANDLE_SIGNALS

#endif

#ifdef HANDLE_SIGNALS

#include <signal.h>

#include "sigtype.h"

#endif

extern char *getpythonpath();

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

void initsigs(); /* Forward */

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

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

/* 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 are initialized

when they are first imported. */

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

initsys();

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

setpythonpath(getpythonpath());

initsigs(); /* Signal handling stuff, including initintr() */

}

/* 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 = "";

}

BGN_SAVE

err = parsefile(fp, filename, &gram, single_input, ps1, ps2, &n);

END_SAVE

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, *f;

err_get(&exception, &v);

if (exception == SystemExit) {

if (v == NULL || v == None)

goaway(0);

if (is_intobject(v))

goaway((int)getintvalue(v));

else {

/* OK to use real stderr here */

printobject(v, stderr, PRINT_RAW);

fprintf(stderr, "\n");

goaway(1);

}

}

sysset("last_type", exception);

sysset("last_value", v);

f = sysget("stderr");

if (f == NULL)

fprintf(stderr, "lost sys.stderr\n");

else {

if (writeobject(exception, f, PRINT_RAW) != 0)

err_clear();

if (v != NULL && v != None) {

writestring(": ", f);

if (writeobject(v, f, PRINT_RAW) != 0)

err_clear();

}

writestring("\n", f);

printtraceback(f);

}

XDECREF(exception);

XDECREF(v);

}

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;

{

int ret;

BGN_SAVE

ret = parsefile(fp, filename, &gram, start,

(char *)0, (char *)0, n_ret);

END_SAVE

return 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 */

#ifdef USE_THREAD

extern int threads_started;

#endif

void

cleanup()

{

object *exitfunc = sysget("exitfunc");

if (exitfunc) {

object *arg;

object *res;

sysset("exitfunc", (object *)NULL);

arg = newtupleobject(0);

if (arg == NULL)

res = NULL;

else {

res = call_object(exitfunc, arg);

DECREF(arg);

}

if (res == NULL) {

fprintf(stderr, "Error in sys.exitfunc:\n");

print_error();

}

}

flushline();

}

void

goaway(sts)

int sts;

{

cleanup();

#ifdef USE_THREAD

/* Other threads may still be active, so skip most of the

cleanup actions usually done (these are mostly for

debugging anyway). */

(void) save_thread();

donecalls();

if (threads_started)

_exit_prog(sts);

else

exit_prog(sts);

#else /* USE_THREAD */

/* 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);

#endif /* USE_THREAD */

/*NOTREACHED*/

}

#ifdef HANDLE_SIGNALS

SIGTYPE

sighandler(sig)

int sig;

{

signal(sig, SIG_DFL); /* Don't catch recursive signals */

cleanup(); /* Do essential clean-up */

kill(getpid(), sig); /* Pretend the signal killed us */

/*NOTREACHED*/

}

#endif

void

initsigs()

{

initintr();

#ifdef HANDLE_SIGNALS

if (signal(SIGHUP, SIG_IGN) != SIG_IGN)

signal(SIGHUP, sighandler);

if (signal(SIGTERM, SIG_IGN) != SIG_IGN)

signal(SIGTERM, sighandler);

#endif

}

#ifdef TRACE_REFS

/* Ask a yes/no question */

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