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Path: ~//proc/thread-self/root/opt/alt/python27/lib/python2.7/site-packages/libfuturize/fixes/

File Content: `fix_metaclass.py`

# coding: utf-8
"""Fixer for __metaclass__ = X -> (future.utils.with_metaclass(X)) methods.

   The various forms of classef (inherits nothing, inherits once, inherints
   many) don't parse the same in the CST so we look at ALL classes for
   a __metaclass__ and if we find one normalize the inherits to all be
   an arglist.

   For one-liner classes ('class X: pass') there is no indent/dedent so
   we normalize those into having a suite.

   Moving the __metaclass__ into the classdef can also cause the class
   body to be empty so there is some special casing for that as well.

   This fixer also tries very hard to keep original indenting and spacing
   in all those corner cases.
"""
# This is a derived work of Lib/lib2to3/fixes/fix_metaclass.py under the
# copyright of the Python Software Foundation, licensed under the Python
# Software Foundation License 2.
#
# Copyright notice:
#
#     Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
#     2011, 2012, 2013 Python Software Foundation. All rights reserved.
#
# Full license text: http://docs.python.org/3.4/license.html

# Author: Jack Diederich, Daniel Neuhäuser

# Local imports
from lib2to3 import fixer_base
from lib2to3.pygram import token
from lib2to3.fixer_util import Name, syms, Node, Leaf, touch_import, Call, \
    String, Comma, parenthesize


def has_metaclass(parent):
    """ we have to check the cls_node without changing it.
        There are two possiblities:
          1)  clsdef => suite => simple_stmt => expr_stmt => Leaf('__meta')
          2)  clsdef => simple_stmt => expr_stmt => Leaf('__meta')
    """
    for node in parent.children:
        if node.type == syms.suite:
            return has_metaclass(node)
        elif node.type == syms.simple_stmt and node.children:
            expr_node = node.children[0]
            if expr_node.type == syms.expr_stmt and expr_node.children:
                left_side = expr_node.children[0]
                if isinstance(left_side, Leaf) and \
                        left_side.value == '__metaclass__':
                    return True
    return False


def fixup_parse_tree(cls_node):
    """ one-line classes don't get a suite in the parse tree so we add
        one to normalize the tree
    """
    for node in cls_node.children:
        if node.type == syms.suite:
            # already in the preferred format, do nothing
            return

    # !%@#! oneliners have no suite node, we have to fake one up
    for i, node in enumerate(cls_node.children):
        if node.type == token.COLON:
            break
    else:
        raise ValueError("No class suite and no ':'!")

    # move everything into a suite node
    suite = Node(syms.suite, [])
    while cls_node.children[i+1:]:
        move_node = cls_node.children[i+1]
        suite.append_child(move_node.clone())
        move_node.remove()
    cls_node.append_child(suite)
    node = suite


def fixup_simple_stmt(parent, i, stmt_node):
    """ if there is a semi-colon all the parts count as part of the same
        simple_stmt.  We just want the __metaclass__ part so we move
        everything efter the semi-colon into its own simple_stmt node
    """
    for semi_ind, node in enumerate(stmt_node.children):
        if node.type == token.SEMI: # *sigh*
            break
    else:
        return

    node.remove() # kill the semicolon
    new_expr = Node(syms.expr_stmt, [])
    new_stmt = Node(syms.simple_stmt, [new_expr])
    while stmt_node.children[semi_ind:]:
        move_node = stmt_node.children[semi_ind]
        new_expr.append_child(move_node.clone())
        move_node.remove()
    parent.insert_child(i, new_stmt)
    new_leaf1 = new_stmt.children[0].children[0]
    old_leaf1 = stmt_node.children[0].children[0]
    new_leaf1.prefix = old_leaf1.prefix


def remove_trailing_newline(node):
    if node.children and node.children[-1].type == token.NEWLINE:
        node.children[-1].remove()


def find_metas(cls_node):
    # find the suite node (Mmm, sweet nodes)
    for node in cls_node.children:
        if node.type == syms.suite:
            break
    else:
        raise ValueError("No class suite!")

    # look for simple_stmt[ expr_stmt[ Leaf('__metaclass__') ] ]
    for i, simple_node in list(enumerate(node.children)):
        if simple_node.type == syms.simple_stmt and simple_node.children:
            expr_node = simple_node.children[0]
            if expr_node.type == syms.expr_stmt and expr_node.children:
                # Check if the expr_node is a simple assignment.
                left_node = expr_node.children[0]
                if isinstance(left_node, Leaf) and \
                        left_node.value == u'__metaclass__':
                    # We found a assignment to __metaclass__.
                    fixup_simple_stmt(node, i, simple_node)
                    remove_trailing_newline(simple_node)
                    yield (node, i, simple_node)


def fixup_indent(suite):
    """ If an INDENT is followed by a thing with a prefix then nuke the prefix
        Otherwise we get in trouble when removing __metaclass__ at suite start
    """
    kids = suite.children[::-1]
    # find the first indent
    while kids:
        node = kids.pop()
        if node.type == token.INDENT:
            break

    # find the first Leaf
    while kids:
        node = kids.pop()
        if isinstance(node, Leaf) and node.type != token.DEDENT:
            if node.prefix:
                node.prefix = u''
            return
        else:
            kids.extend(node.children[::-1])


class FixMetaclass(fixer_base.BaseFix):
    BM_compatible = True

    PATTERN = """
    classdef<any*>
    """

    def transform(self, node, results):
        if not has_metaclass(node):
            return

        fixup_parse_tree(node)

        # find metaclasses, keep the last one
        last_metaclass = None
        for suite, i, stmt in find_metas(node):
            last_metaclass = stmt
            stmt.remove()

        text_type = node.children[0].type # always Leaf(nnn, 'class')

        # figure out what kind of classdef we have
        if len(node.children) == 7:
            # Node(classdef, ['class', 'name', '(', arglist, ')', ':', suite])
            #                 0        1       2    3        4    5    6
            if node.children[3].type == syms.arglist:
                arglist = node.children[3]
            # Node(classdef, ['class', 'name', '(', 'Parent', ')', ':', suite])
            else:
                parent = node.children[3].clone()
                arglist = Node(syms.arglist, [parent])
                node.set_child(3, arglist)
        elif len(node.children) == 6:
            # Node(classdef, ['class', 'name', '(',  ')', ':', suite])
            #                 0        1       2     3    4    5
            arglist = Node(syms.arglist, [])
            node.insert_child(3, arglist)
        elif len(node.children) == 4:
            # Node(classdef, ['class', 'name', ':', suite])
            #                 0        1       2    3
            arglist = Node(syms.arglist, [])
            node.insert_child(2, Leaf(token.RPAR, u')'))
            node.insert_child(2, arglist)
            node.insert_child(2, Leaf(token.LPAR, u'('))
        else:
            raise ValueError("Unexpected class definition")

        # now stick the metaclass in the arglist
        meta_txt = last_metaclass.children[0].children[0]
        meta_txt.value = 'metaclass'
        orig_meta_prefix = meta_txt.prefix

        # Was: touch_import(None, u'future.utils', node)
        touch_import(u'future.utils', u'with_metaclass', node)

        metaclass = last_metaclass.children[0].children[2].clone()
        metaclass.prefix = u''

        arguments = [metaclass]

        if arglist.children:
            if len(arglist.children) == 1:
                base = arglist.children[0].clone()
                base.prefix = u' '
            else:
                # Unfortunately six.with_metaclass() only allows one base
                # class, so we have to dynamically generate a base class if
                # there is more than one.
                bases = parenthesize(arglist.clone())
                bases.prefix = u' '
                base = Call(Name('type'), [
                    String("'NewBase'"),
                    Comma(),
                    bases,
                    Comma(),
                    Node(
                        syms.atom,
                        [Leaf(token.LBRACE, u'{'), Leaf(token.RBRACE, u'}')],
                        prefix=u' '
                    )
                ], prefix=u' ')
            arguments.extend([Comma(), base])

        arglist.replace(Call(
            Name(u'with_metaclass', prefix=arglist.prefix),
            arguments
        ))

        fixup_indent(suite)

        # check for empty suite
        if not suite.children:
            # one-liner that was just __metaclass_
            suite.remove()
            pass_leaf = Leaf(text_type, u'pass')
            pass_leaf.prefix = orig_meta_prefix
            node.append_child(pass_leaf)
            node.append_child(Leaf(token.NEWLINE, u'\n'))

        elif len(suite.children) > 1 and \
                 (suite.children[-2].type == token.INDENT and
                  suite.children[-1].type == token.DEDENT):
            # there was only one line in the class body and it was __metaclass__
            pass_leaf = Leaf(text_type, u'pass')
            suite.insert_child(-1, pass_leaf)
            suite.insert_child(-1, Leaf(token.NEWLINE, u'\n'))

Edit Rename Chmod Delete

FILE FOLDER

Name	Size	Permission
__init__.py	5141 bytes	0644
__init__.pyc	2406 bytes	0644
__init__.pyo	2406 bytes	0644
fix_UserDict.py	3840 bytes	0644
fix_UserDict.pyc	2903 bytes	0644
fix_UserDict.pyo	2903 bytes	0644
fix_absolute_import.py	3140 bytes	0644
fix_absolute_import.pyc	3022 bytes	0644
fix_absolute_import.pyo	3022 bytes	0644
fix_add__future__imports_except_unicode_literals.py	662 bytes	0644
fix_add__future__imports_except_unicode_literals.pyc	1336 bytes	0644
fix_add__future__imports_except_unicode_literals.pyo	1336 bytes	0644
fix_basestring.py	394 bytes	0644
fix_basestring.pyc	1007 bytes	0644
fix_basestring.pyo	1007 bytes	0644
fix_bytes.py	685 bytes	0644
fix_bytes.pyc	1311 bytes	0644
fix_bytes.pyo	1311 bytes	0644
fix_cmp.py	701 bytes	0644
fix_cmp.pyc	1321 bytes	0644
fix_cmp.pyo	1321 bytes	0644
fix_division.py	228 bytes	0644
fix_division.pyc	438 bytes	0644
fix_division.pyo	438 bytes	0644
fix_division_safe.py	3460 bytes	0644
fix_division_safe.pyc	4468 bytes	0644
fix_division_safe.pyo	4468 bytes	0644
fix_execfile.py	921 bytes	0644
fix_execfile.pyc	1556 bytes	0644
fix_execfile.pyo	1556 bytes	0644
fix_future_builtins.py	2027 bytes	0644
fix_future_builtins.pyc	1957 bytes	0644
fix_future_builtins.pyo	1957 bytes	0644
fix_future_standard_library.py	733 bytes	0644
fix_future_standard_library.pyc	1256 bytes	0644
fix_future_standard_library.pyo	1256 bytes	0644
fix_future_standard_library_urllib.py	1001 bytes	0644
fix_future_standard_library_urllib.pyc	1342 bytes	0644
fix_future_standard_library_urllib.pyo	1342 bytes	0644
fix_metaclass.py	9568 bytes	0644
fix_metaclass.pyc	7373 bytes	0644
fix_metaclass.pyo	7373 bytes	0644
fix_next_call.py	3158 bytes	0644
fix_next_call.pyc	3736 bytes	0644
fix_next_call.pyo	3703 bytes	0644
fix_object.py	407 bytes	0644
fix_object.pyc	997 bytes	0644
fix_object.pyo	997 bytes	0644
fix_oldstr_wrap.py	1214 bytes	0644
fix_oldstr_wrap.pyc	1728 bytes	0644
fix_oldstr_wrap.pyo	1728 bytes	0644
fix_order___future__imports.py	829 bytes	0644
fix_order___future__imports.pyc	1247 bytes	0644
fix_order___future__imports.pyo	1247 bytes	0644
fix_print.py	3384 bytes	0644
fix_print.pyc	2879 bytes	0644
fix_print.pyo	2782 bytes	0644
fix_print_with_import.py	735 bytes	0644
fix_print_with_import.pyc	1129 bytes	0644
fix_print_with_import.pyo	1129 bytes	0644
fix_raise.py	2167 bytes	0644
fix_raise.pyc	2126 bytes	0644
fix_raise.pyo	2126 bytes	0644
fix_remove_old__future__imports.py	851 bytes	0644
fix_remove_old__future__imports.pyc	1479 bytes	0644
fix_remove_old__future__imports.pyo	1479 bytes	0644
fix_unicode_keep_u.py	779 bytes	0644
fix_unicode_keep_u.pyc	1413 bytes	0644
fix_unicode_keep_u.pyo	1413 bytes	0644
fix_unicode_literals_import.py	367 bytes	0644
fix_unicode_literals_import.pyc	1029 bytes	0644
fix_unicode_literals_import.pyo	1029 bytes	0644
fix_xrange_with_import.py	479 bytes	0644
fix_xrange_with_import.pyc	1060 bytes	0644
fix_xrange_with_import.pyo	1060 bytes	0644

File Content: fix_metaclass.py

File Content: `fix_metaclass.py`