__main__.py 文件源码

def main():
    parser = argparse.ArgumentParser(description="The interpreter for Pluto")

    parser.add_argument("-f", "--file", action="store", dest="file", type=str, help="the file to execute")
    parser.add_argument("-p", "--parse", action="store_true", default=False, help="just parse the file - don't execute it")
    parser.add_argument("-t", "--tree", action="store_true", default=False, help="print the parse tree")
    parser.add_argument("-i", "--interactive", action="store_true", default=False, help="enter interactive mode after the file has been run")
    parser.add_argument("-n", "--no-prelude", action="store_true", dest="no_prelude", help="don't load the prelude")
    parser.add_argument("-v", "--version", action="version", version="Pluto, early beta version")

    args = parser.parse_args()

    if args.file == None:
        ctx = c.Context()

        if not args.no_prelude:
            import_prelude(ctx)

        repl(ctx)
    else:
        try:
            text = open(args.file).read()

            if args.parse or args.tree:
                tokens = l.lex(text)
                parse = p.Parser(tokens)
                program = parse.parse_program()

                if len(parse.errors) > 0:
                    parse.print_errors()
                elif args.tree:
                    print(program)

                return

            ctx = c.Context()

            if not args.no_prelude:
                import_prelude(ctx)

            execute(text, False, ctx)

            if args.interactive:
                print()
                repl(ctx)

        except FileNotFoundError:
            print("File not found: %s" % args.file)
            return