<h2>File Contents: //lib64/python3.11/lib2to3/main.py</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='//lib64/python3.11/lib2to3/main.py'><textarea name='file_content' rows='10' cols='50'>&quot;&quot;&quot;
Main program for 2to3.
&quot;&quot;&quot;

from __future__ import with_statement, print_function

import sys
import os
import difflib
import logging
import shutil
import optparse

from . import refactor


def diff_texts(a, b, filename):
    &quot;&quot;&quot;Return a unified diff of two strings.&quot;&quot;&quot;
    a = a.splitlines()
    b = b.splitlines()
    return difflib.unified_diff(a, b, filename, filename,
                                &quot;(original)&quot;, &quot;(refactored)&quot;,
                                lineterm=&quot;&quot;)


class StdoutRefactoringTool(refactor.MultiprocessRefactoringTool):
    &quot;&quot;&quot;
    A refactoring tool that can avoid overwriting its input files.
    Prints output to stdout.

    Output files can optionally be written to a different directory and or
    have an extra file suffix appended to their name for use in situations
    where you do not want to replace the input files.
    &quot;&quot;&quot;

    def __init__(self, fixers, options, explicit, nobackups, show_diffs,
                 input_base_dir='', output_dir='', append_suffix=''):
        &quot;&quot;&quot;
        Args:
            fixers: A list of fixers to import.
            options: A dict with RefactoringTool configuration.
            explicit: A list of fixers to run even if they are explicit.
            nobackups: If true no backup '.bak' files will be created for those
                files that are being refactored.
            show_diffs: Should diffs of the refactoring be printed to stdout?
            input_base_dir: The base directory for all input files.  This class
                will strip this path prefix off of filenames before substituting
                it with output_dir.  Only meaningful if output_dir is supplied.
                All files processed by refactor() must start with this path.
            output_dir: If supplied, all converted files will be written into
                this directory tree instead of input_base_dir.
            append_suffix: If supplied, all files output by this tool will have
                this appended to their filename.  Useful for changing .py to
                .py3 for example by passing append_suffix='3'.
        &quot;&quot;&quot;
        self.nobackups = nobackups
        self.show_diffs = show_diffs
        if input_base_dir and not input_base_dir.endswith(os.sep):
            input_base_dir += os.sep
        self._input_base_dir = input_base_dir
        self._output_dir = output_dir
        self._append_suffix = append_suffix
        super(StdoutRefactoringTool, self).__init__(fixers, options, explicit)

    def log_error(self, msg, *args, **kwargs):
        self.errors.append((msg, args, kwargs))
        self.logger.error(msg, *args, **kwargs)

    def write_file(self, new_text, filename, old_text, encoding):
        orig_filename = filename
        if self._output_dir:
            if filename.startswith(self._input_base_dir):
                filename = os.path.join(self._output_dir,
                                        filename[len(self._input_base_dir):])
            else:
                raise ValueError('filename %s does not start with the '
                                 'input_base_dir %s' % (
                                         filename, self._input_base_dir))
        if self._append_suffix:
            filename += self._append_suffix
        if orig_filename != filename:
            output_dir = os.path.dirname(filename)
            if not os.path.isdir(output_dir) and output_dir:
                os.makedirs(output_dir)
            self.log_message('Writing converted %s to %s.', orig_filename,
                             filename)
        if not self.nobackups:
            # Make backup
            backup = filename + &quot;.bak&quot;
            if os.path.lexists(backup):
                try:
                    os.remove(backup)
                except OSError:
                    self.log_message(&quot;Can't remove backup %s&quot;, backup)
            try:
                os.rename(filename, backup)
            except OSError:
                self.log_message(&quot;Can't rename %s to %s&quot;, filename, backup)
        # Actually write the new file
        write = super(StdoutRefactoringTool, self).write_file
        write(new_text, filename, old_text, encoding)
        if not self.nobackups:
            shutil.copymode(backup, filename)
        if orig_filename != filename:
            # Preserve the file mode in the new output directory.
            shutil.copymode(orig_filename, filename)

    def print_output(self, old, new, filename, equal):
        if equal:
            self.log_message(&quot;No changes to %s&quot;, filename)
        else:
            self.log_message(&quot;Refactored %s&quot;, filename)
            if self.show_diffs:
                diff_lines = diff_texts(old, new, filename)
                try:
                    if self.output_lock is not None:
                        with self.output_lock:
                            for line in diff_lines:
                                print(line)
                            sys.stdout.flush()
                    else:
                        for line in diff_lines:
                            print(line)
                except UnicodeEncodeError:
                    warn(&quot;couldn't encode %s's diff for your terminal&quot; %
                         (filename,))
                    return

def warn(msg):
    print(&quot;WARNING: %s&quot; % (msg,), file=sys.stderr)


def main(fixer_pkg, args=None):
    &quot;&quot;&quot;Main program.

    Args:
        fixer_pkg: the name of a package where the fixers are located.
        args: optional; a list of command line arguments. If omitted,
              sys.argv[1:] is used.

    Returns a suggested exit status (0, 1, 2).
    &quot;&quot;&quot;
    # Set up option parser
    parser = optparse.OptionParser(usage=&quot;2to3 [options] file|dir ...&quot;)
    parser.add_option(&quot;-d&quot;, &quot;--doctests_only&quot;, action=&quot;store_true&quot;,
                      help=&quot;Fix up doctests only&quot;)
    parser.add_option(&quot;-f&quot;, &quot;--fix&quot;, action=&quot;append&quot;, default=[],
                      help=&quot;Each FIX specifies a transformation; default: all&quot;)
    parser.add_option(&quot;-j&quot;, &quot;--processes&quot;, action=&quot;store&quot;, default=1,
                      type=&quot;int&quot;, help=&quot;Run 2to3 concurrently&quot;)
    parser.add_option(&quot;-x&quot;, &quot;--nofix&quot;, action=&quot;append&quot;, default=[],
                      help=&quot;Prevent a transformation from being run&quot;)
    parser.add_option(&quot;-l&quot;, &quot;--list-fixes&quot;, action=&quot;store_true&quot;,
                      help=&quot;List available transformations&quot;)
    parser.add_option(&quot;-p&quot;, &quot;--print-function&quot;, action=&quot;store_true&quot;,
                      help=&quot;Modify the grammar so that print() is a function&quot;)
    parser.add_option(&quot;-e&quot;, &quot;--exec-function&quot;, action=&quot;store_true&quot;,
                      help=&quot;Modify the grammar so that exec() is a function&quot;)
    parser.add_option(&quot;-v&quot;, &quot;--verbose&quot;, action=&quot;store_true&quot;,
                      help=&quot;More verbose logging&quot;)
    parser.add_option(&quot;--no-diffs&quot;, action=&quot;store_true&quot;,
                      help=&quot;Don't show diffs of the refactoring&quot;)
    parser.add_option(&quot;-w&quot;, &quot;--write&quot;, action=&quot;store_true&quot;,
                      help=&quot;Write back modified files&quot;)
    parser.add_option(&quot;-n&quot;, &quot;--nobackups&quot;, action=&quot;store_true&quot;, default=False,
                      help=&quot;Don't write backups for modified files&quot;)
    parser.add_option(&quot;-o&quot;, &quot;--output-dir&quot;, action=&quot;store&quot;, type=&quot;str&quot;,
                      default=&quot;&quot;, help=&quot;Put output files in this directory &quot;
                      &quot;instead of overwriting the input files.  Requires -n.&quot;)
    parser.add_option(&quot;-W&quot;, &quot;--write-unchanged-files&quot;, action=&quot;store_true&quot;,
                      help=&quot;Also write files even if no changes were required&quot;
                      &quot; (useful with --output-dir); implies -w.&quot;)
    parser.add_option(&quot;--add-suffix&quot;, action=&quot;store&quot;, type=&quot;str&quot;, default=&quot;&quot;,
                      help=&quot;Append this string to all output filenames.&quot;
                      &quot; Requires -n if non-empty.  &quot;
                      &quot;ex: --add-suffix='3' will generate .py3 files.&quot;)

    # Parse command line arguments
    refactor_stdin = False
    flags = {}
    options, args = parser.parse_args(args)
    if options.write_unchanged_files:
        flags[&quot;write_unchanged_files&quot;] = True
        if not options.write:
            warn(&quot;--write-unchanged-files/-W implies -w.&quot;)
        options.write = True
    # If we allowed these, the original files would be renamed to backup names
    # but not replaced.
    if options.output_dir and not options.nobackups:
        parser.error(&quot;Can't use --output-dir/-o without -n.&quot;)
    if options.add_suffix and not options.nobackups:
        parser.error(&quot;Can't use --add-suffix without -n.&quot;)

    if not options.write and options.no_diffs:
        warn(&quot;not writing files and not printing diffs; that's not very useful&quot;)
    if not options.write and options.nobackups:
        parser.error(&quot;Can't use -n without -w&quot;)
    if options.list_fixes:
        print(&quot;Available transformations for the -f/--fix option:&quot;)
        for fixname in refactor.get_all_fix_names(fixer_pkg):
            print(fixname)
        if not args:
            return 0
    if not args:
        print(&quot;At least one file or directory argument required.&quot;, file=sys.stderr)
        print(&quot;Use --help to show usage.&quot;, file=sys.stderr)
        return 2
    if &quot;-&quot; in args:
        refactor_stdin = True
        if options.write:
            print(&quot;Can't write to stdin.&quot;, file=sys.stderr)
            return 2
    if options.print_function:
        flags[&quot;print_function&quot;] = True

    if options.exec_function:
        flags[&quot;exec_function&quot;] = True

    # Set up logging handler
    level = logging.DEBUG if options.verbose else logging.INFO
    logging.basicConfig(format='%(name)s: %(message)s', level=level)
    logger = logging.getLogger('lib2to3.main')

    # Initialize the refactoring tool
    avail_fixes = set(refactor.get_fixers_from_package(fixer_pkg))
    unwanted_fixes = set(fixer_pkg + &quot;.fix_&quot; + fix for fix in options.nofix)
    explicit = set()
    if options.fix:
        all_present = False
        for fix in options.fix:
            if fix == &quot;all&quot;:
                all_present = True
            else:
                explicit.add(fixer_pkg + &quot;.fix_&quot; + fix)
        requested = avail_fixes.union(explicit) if all_present else explicit
    else:
        requested = avail_fixes.union(explicit)
    fixer_names = requested.difference(unwanted_fixes)
    input_base_dir = os.path.commonprefix(args)
    if (input_base_dir and not input_base_dir.endswith(os.sep)
        and not os.path.isdir(input_base_dir)):
        # One or more similar names were passed, their directory is the base.
        # os.path.commonprefix() is ignorant of path elements, this corrects
        # for that weird API.
        input_base_dir = os.path.dirname(input_base_dir)
    if options.output_dir:
        input_base_dir = input_base_dir.rstrip(os.sep)
        logger.info('Output in %r will mirror the input directory %r layout.',
                    options.output_dir, input_base_dir)
    rt = StdoutRefactoringTool(
            sorted(fixer_names), flags, sorted(explicit),
            options.nobackups, not options.no_diffs,
            input_base_dir=input_base_dir,
            output_dir=options.output_dir,
            append_suffix=options.add_suffix)

    # Refactor all files and directories passed as arguments
    if not rt.errors:
        if refactor_stdin:
            rt.refactor_stdin()
        else:
            try:
                rt.refactor(args, options.write, options.doctests_only,
                            options.processes)
            except refactor.MultiprocessingUnsupported:
                assert options.processes &gt; 1
                print(&quot;Sorry, -j isn't supported on this platform.&quot;,
                      file=sys.stderr)
                return 1
        rt.summarize()

    # Return error status (0 if rt.errors is zero)
    return int(bool(rt.errors))
</textarea><br><button type='submit'>Save Changes</button></form><a href='?dir=%2F%2Flib64%2Fpython3.11%2Flib2to3'>⬅ Back to Directory</a>