mirror of
https://github.com/python/cpython.git
synced 2024-11-28 16:45:42 +01:00
415 lines
6.9 KiB
C
415 lines
6.9 KiB
C
/* Python interpreter main program */
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#include "allobjects.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 "sysmodule.h"
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#include "compile.h"
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#include "ceval.h"
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#include "pythonrun.h"
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#include "import.h"
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extern char *getpythonpath();
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extern grammar gram; /* From graminit.c */
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#ifdef DEBUG
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int debugging; /* Needed by parser.c */
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#endif
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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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initargs(&argc, &argv);
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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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initall();
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setpythonpath(getpythonpath());
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setpythonargv(argc-1, argv+1);
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goaway(run(fp, filename == NULL ? "<stdin>" : filename));
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/*NOTREACHED*/
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}
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/* Initialize all */
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void
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initall()
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{
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static int inited;
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if (inited)
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return;
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inited = 1;
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initimport();
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/* Modules 'builtin' and 'sys' are initialized here,
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they are needed by random bits of the interpreter.
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All other modules are optional and should be initialized
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by the initcalls() of a specific configuration. */
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initbuiltin(); /* Also initializes builtin exceptions */
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initsys();
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initcalls(); /* Configuration-dependent initializations */
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initintr(); /* For intrcheck() */
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}
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/* Parse input from a file and execute it */
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int
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run(fp, filename)
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FILE *fp;
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char *filename;
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{
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if (filename == NULL)
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filename = "???";
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if (isatty(fileno(fp)))
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return run_tty_loop(fp, filename);
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else
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return run_script(fp, filename);
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}
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int
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run_tty_loop(fp, filename)
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FILE *fp;
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char *filename;
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{
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object *v;
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int ret;
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v = sysget("ps1");
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if (v == NULL) {
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sysset("ps1", v = newstringobject(">>> "));
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XDECREF(v);
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}
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v = sysget("ps2");
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if (v == NULL) {
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sysset("ps2", v = newstringobject("... "));
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XDECREF(v);
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}
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for (;;) {
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ret = run_tty_1(fp, filename);
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#ifdef REF_DEBUG
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fprintf(stderr, "[%ld refs]\n", ref_total);
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#endif
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if (ret == E_EOF)
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return 0;
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/*
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if (ret == E_NOMEM)
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return -1;
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*/
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}
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}
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int
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run_tty_1(fp, filename)
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FILE *fp;
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char *filename;
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{
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object *m, *d, *v, *w;
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node *n;
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char *ps1, *ps2;
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int err;
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v = sysget("ps1");
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w = sysget("ps2");
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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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ps1 = "";
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}
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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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ps2 = "";
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}
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err = parsefile(fp, filename, &gram, single_input, ps1, ps2, &n);
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XDECREF(v);
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XDECREF(w);
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if (err == E_EOF)
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return E_EOF;
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if (err != E_DONE) {
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err_input(err);
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print_error();
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return err;
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}
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m = add_module("__main__");
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if (m == NULL)
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return -1;
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d = getmoduledict(m);
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v = run_node(n, filename, d, d);
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flushline();
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if (v == NULL) {
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print_error();
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return -1;
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}
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DECREF(v);
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return 0;
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}
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int
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run_script(fp, filename)
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FILE *fp;
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char *filename;
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{
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object *m, *d, *v;
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m = add_module("__main__");
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if (m == NULL)
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return -1;
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d = getmoduledict(m);
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v = run_file(fp, filename, file_input, d, d);
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flushline();
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if (v == NULL) {
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print_error();
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return -1;
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}
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DECREF(v);
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return 0;
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}
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void
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print_error()
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{
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object *exception, *v;
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err_get(&exception, &v);
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fprintf(stderr, "Unhandled exception: ");
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printobject(exception, stderr, PRINT_RAW);
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if (v != NULL && v != None) {
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fprintf(stderr, ": ");
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printobject(v, stderr, PRINT_RAW);
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}
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fprintf(stderr, "\n");
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XDECREF(exception);
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XDECREF(v);
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printtraceback(stderr);
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}
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object *
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run_string(str, start, globals, locals)
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char *str;
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int start;
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/*dict*/object *globals, *locals;
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{
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node *n;
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int err;
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err = parse_string(str, start, &n);
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return run_err_node(err, n, "<string>", globals, locals);
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}
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object *
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run_file(fp, filename, start, globals, locals)
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FILE *fp;
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char *filename;
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int start;
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/*dict*/object *globals, *locals;
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{
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node *n;
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int err;
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err = parse_file(fp, filename, start, &n);
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return run_err_node(err, n, filename, globals, locals);
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}
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object *
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run_err_node(err, n, filename, globals, locals)
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int err;
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node *n;
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char *filename;
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/*dict*/object *globals, *locals;
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{
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if (err != E_DONE) {
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err_input(err);
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return NULL;
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}
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return run_node(n, filename, globals, locals);
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}
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object *
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run_node(n, filename, globals, locals)
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node *n;
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char *filename;
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/*dict*/object *globals, *locals;
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{
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if (globals == NULL) {
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globals = getglobals();
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if (locals == NULL)
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locals = getlocals();
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}
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else {
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if (locals == NULL)
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locals = globals;
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}
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return eval_node(n, filename, globals, locals);
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}
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object *
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eval_node(n, filename, globals, locals)
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node *n;
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char *filename;
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object *globals;
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object *locals;
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{
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codeobject *co;
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object *v;
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co = compile(n, filename);
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freetree(n);
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if (co == NULL)
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return NULL;
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v = eval_code(co, globals, locals, (object *)NULL);
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DECREF(co);
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return v;
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}
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/* Simplified interface to parsefile */
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int
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parse_file(fp, filename, start, n_ret)
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FILE *fp;
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char *filename;
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int start;
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node **n_ret;
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{
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return parsefile(fp, filename, &gram, start,
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(char *)0, (char *)0, n_ret);
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}
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/* Simplified interface to parsestring */
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int
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parse_string(str, start, n_ret)
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char *str;
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int start;
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node **n_ret;
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{
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int err = parsestring(str, &gram, start, n_ret);
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/* Don't confuse early end of string with early end of input */
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if (err == E_EOF)
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err = E_SYNTAX;
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return err;
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}
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/* Print fatal error message and abort */
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void
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fatal(msg)
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char *msg;
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{
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fprintf(stderr, "Fatal error: %s\n", msg);
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abort();
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}
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/* Clean up and exit */
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void
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goaway(sts)
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int sts;
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{
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flushline();
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/* XXX Call doneimport() before donecalls(), since donecalls()
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calls wdone(), and doneimport() may close windows */
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doneimport();
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donecalls();
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err_clear();
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#ifdef REF_DEBUG
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fprintf(stderr, "[%ld refs]\n", ref_total);
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#endif
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#ifdef THINK_C_3_0
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if (sts == 0)
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Click_On(0);
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#endif
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#ifdef TRACE_REFS
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if (askyesno("Print left references?")) {
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#ifdef THINK_C_3_0
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Click_On(1);
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#endif
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printrefs(stderr);
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}
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#endif /* TRACE_REFS */
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exit(sts);
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/*NOTREACHED*/
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}
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static
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finaloutput()
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{
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#ifdef TRACE_REFS
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if (!askyesno("Print left references?"))
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return;
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#ifdef THINK_C_3_0
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Click_On(1);
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#endif
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printrefs(stderr);
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#endif /* TRACE_REFS */
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}
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/* Ask a yes/no question */
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static 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_3_0
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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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/* XXX WISH LIST
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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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- 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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/* "Floccinaucinihilipilification" */
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