mirror of
https://github.com/python/cpython.git
synced 2024-11-28 12:31:14 +08:00
160 lines
2.8 KiB
C
160 lines
2.8 KiB
C
/* Python interpreter main program */
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#include <stdio.h>
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#include <ctype.h>
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#include "string.h"
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extern char *getpythonpath();
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#include "PROTO.h"
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#include "grammar.h"
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#include "node.h"
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#include "parsetok.h"
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#include "graminit.h"
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#include "errcode.h"
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#include "object.h"
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#include "stringobject.h"
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#include "sysmodule.h"
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extern grammar gram; /* From graminit.c */
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int debugging;
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main(argc, argv)
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int argc;
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char **argv;
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{
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char *filename = NULL;
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FILE *fp = stdin;
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int ret;
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initargs(&argc, &argv);
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initintr(); /* For intrcheck() */
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if (argc > 1 && strcmp(argv[1], "-") != 0)
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filename = argv[1];
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if (filename != NULL) {
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if ((fp = fopen(filename, "r")) == NULL) {
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fprintf(stderr, "python: can't open file '%s'\n",
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filename);
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exit(2);
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}
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}
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/* XXX what is the ideal initialization order? */
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initsys(argc-1, argv+1);
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inittime();
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initmath();
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setpythonpath(getpythonpath());
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initrun();
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initcalls();
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if (!isatty(fileno(fp))) {
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ret = runfile(fp, file_input, (char *)NULL, (char *)NULL);
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}
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else {
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sysset("ps1", newstringobject(">>> "));
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sysset("ps2", newstringobject("... "));
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for (;;) {
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object *v = sysget("ps1"), *w = sysget("ps2");
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char *ps1 = NULL, *ps2 = NULL;
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if (v != NULL && is_stringobject(v)) {
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INCREF(v);
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ps1 = getstringvalue(v);
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}
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else
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v = NULL;
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if (w != NULL && is_stringobject(w)) {
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INCREF(w);
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ps2 = getstringvalue(w);
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}
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else
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w = NULL;
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ret = runfile(fp, single_input, ps1, ps2);
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if (v != NULL)
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DECREF(v);
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if (w != NULL)
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DECREF(w);
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if (ret == E_EOF || ret == E_NOMEM)
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break;
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}
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}
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goaway(ret == E_DONE || ret == E_EOF ? 0 : 1);
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/*NOTREACHED*/
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}
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goaway(sts)
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int sts;
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{
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#ifdef THINK_C
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if (sts == 0)
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Click_On(0);
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#endif
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closerun();
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donecalls();
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exit(sts);
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/*NOTREACHED*/
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}
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/* Parse input from a file and execute it */
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static int
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runfile(fp, start, ps1, ps2)
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FILE *fp;
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int start;
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char *ps1, *ps2;
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{
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node *n;
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int ret;
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ret = parsefile(fp, &gram, start, ps1, ps2, &n);
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if (ret != E_DONE)
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return ret;
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return execute(n) == 0 ? E_DONE : E_ERROR;
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}
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/* Ask a yes/no question */
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int
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askyesno(prompt)
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char *prompt;
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{
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char buf[256];
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printf("%s [ny] ", prompt);
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if (fgets(buf, sizeof buf, stdin) == NULL)
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return 0;
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return buf[0] == 'y' || buf[0] == 'Y';
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}
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#ifdef THINK_C
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/* Check for file descriptor connected to interactive device.
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Pretend that stdin is always interactive, other files never. */
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int
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isatty(fd)
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int fd;
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{
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return fd == fileno(stdin);
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}
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#endif
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/* WISH LIST
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- improved per-module error handling; different use of errno
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- possible new types:
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- iterator (for range, keys, ...)
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- improve interpreter error handling, e.g., true tracebacks
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- release parse trees when no longer needed (make them objects?)
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- faster parser (for long modules)
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- save precompiled modules on file?
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- fork threads, locking
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- allow syntax extensions
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*/
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