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

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 */

#ifdef DEBUG

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

#endif

main(argc, argv)

int argc;

char **argv;

{

char *filename = NULL;

FILE *fp = stdin;

initargs(&argc, &argv);

if (argc > 1 && strcmp(argv[1], "-") != 0)

filename = argv[1];

if (filename != NULL) {

if ((fp = fopen(filename, "r")) == NULL) {

fprintf(stderr, "python: can't open file '%s'\n",

filename);

exit(2);

}

}

initall();

setpythonpath(getpythonpath());

setpythonargv(argc-1, argv+1);

goaway(run(fp, filename == NULL ? "<stdin>" : filename));

/*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;

}

void

print_error()

{

object *exception, *v;

err_get(&exception, &v);

fprintf(stderr, "Unhandled exception: ");

printobject(exception, stderr, PRINT_RAW);

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

fprintf(stderr, ": ");

printobject(v, stderr, PRINT_RAW);

}

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 THINK_C_3_0

if (sts == 0)

Click_On(0);

#endif

#ifdef TRACE_REFS

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

#ifdef THINK_C_3_0

Click_On(1);

#endif

printrefs(stderr);

}

#endif /* TRACE_REFS */

exit(sts);

/*NOTREACHED*/

}

static

finaloutput()

{

#ifdef TRACE_REFS

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

return;

#ifdef THINK_C_3_0

Click_On(1);

#endif

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 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

/* XXX WISH LIST

- possible new types:

- iterator (for range, keys, ...)

- improve interpreter error handling, e.g., true tracebacks

- save precompiled modules on file?

- fork threads, locking

- allow syntax extensions

*/

/* "Floccinaucinihilipilification" */