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"""Fixer for function definitions with tuple parameters.

def func(((a, b), c), d):
    ...

    ->

def func(x, d):
    ((a, b), c) = x
    ...

It will also support lambdas:

    lambda (x, y): x + y -> lambda t: t[0] + t[1]

    # The parens are a syntax error in Python 3
    lambda (x): x + y -> lambda x: x + y
"""
# Author: Collin Winter

# Local imports
from .. import pytree
from ..pgen2 import token
from .. import fixer_base
from ..fixer_util import Assign, Name, Newline, Number, Subscript, syms

def is_docstring(stmt):
    return isinstance(stmt, pytree.Node) and \
           stmt.children[0].type == token.STRING

class FixTupleParams(fixer_base.BaseFix):
    run_order = 4 #use a lower order since lambda is part of other
                  #patterns
    BM_compatible = True

    PATTERN = """
              funcdef< 'def' any parameters< '(' args=any ')' >
                       ['->' any] ':' suite=any+ >
              |
              lambda=
              lambdef< 'lambda' args=vfpdef< '(' inner=any ')' >
                       ':' body=any
              >
              """

    def transform(self, node, results):
        if "lambda" in results:
            return self.transform_lambda(node, results)

        new_lines = []
        suite = results["suite"]
        args = results["args"]
        # This crap is so "def foo(...): x = 5; y = 7" is handled correctly.
        # TODO(cwinter): suite-cleanup
        if suite[0].children[1].type == token.INDENT:
            start = 2
            indent = suite[0].children[1].value
            end = Newline()
        else:
            start = 0
            indent = "; "
            end = pytree.Leaf(token.INDENT, "")

        # We need access to self for new_name(), and making this a method
        #  doesn't feel right. Closing over self and new_lines makes the
        #  code below cleaner.
        def handle_tuple(tuple_arg, add_prefix=False):
            n = Name(self.new_name())
            arg = tuple_arg.clone()
            arg.prefix = ""
            stmt = Assign(arg, n.clone())
            if add_prefix:
                n.prefix = " "
            tuple_arg.replace(n)
            new_lines.append(pytree.Node(syms.simple_stmt,
                                         [stmt, end.clone()]))

        if args.type == syms.tfpdef:
            handle_tuple(args)
        elif args.type == syms.typedargslist:
            for i, arg in enumerate(args.children):
                if arg.type == syms.tfpdef:
                    # Without add_prefix, the emitted code is correct,
                    #  just ugly.
                    handle_tuple(arg, add_prefix=(i > 0))

        if not new_lines:
            return

        # This isn't strictly necessary, but it plays nicely with other fixers.
        # TODO(cwinter) get rid of this when children becomes a smart list
        for line in new_lines:
            line.parent = suite[0]

        # TODO(cwinter) suite-cleanup
        after = start
        if start == 0:
            new_lines[0].prefix = " "
        elif is_docstring(suite[0].children[start]):
            new_lines[0].prefix = indent
            after = start + 1

        for line in new_lines:
            line.parent = suite[0]
        suite[0].children[after:after] = new_lines
        for i in range(after+1, after+len(new_lines)+1):
            suite[0].children[i].prefix = indent
        suite[0].changed()

    def transform_lambda(self, node, results):
        args = results["args"]
        body = results["body"]
        inner = simplify_args(results["inner"])

        # Replace lambda ((((x)))): x  with lambda x: x
        if inner.type == token.NAME:
            inner = inner.clone()
            inner.prefix = " "
            args.replace(inner)
            return

        params = find_params(args)
        to_index = map_to_index(params)
        tup_name = self.new_name(tuple_name(params))

        new_param = Name(tup_name, prefix=" ")
        args.replace(new_param.clone())
        for n in body.post_order():
            if n.type == token.NAME and n.value in to_index:
                subscripts = [c.clone() for c in to_index[n.value]]
                new = pytree.Node(syms.power,
                                  [new_param.clone()] + subscripts)
                new.prefix = n.prefix
                n.replace(new)


### Helper functions for transform_lambda()

def simplify_args(node):
    if node.type in (syms.vfplist, token.NAME):
        return node
    elif node.type == syms.vfpdef:
        # These look like vfpdef< '(' x ')' > where x is NAME
        # or another vfpdef instance (leading to recursion).
        while node.type == syms.vfpdef:
            node = node.children[1]
        return node
    raise RuntimeError("Received unexpected node %s" % node)

def find_params(node):
    if node.type == syms.vfpdef:
        return find_params(node.children[1])
    elif node.type == token.NAME:
        return node.value
    return [find_params(c) for c in node.children if c.type != token.COMMA]

def map_to_index(param_list, prefix=[], d=None):
    if d is None:
        d = {}
    for i, obj in enumerate(param_list):
        trailer = [Subscript(Number(str(i)))]
        if isinstance(obj, list):
            map_to_index(obj, trailer, d=d)
        else:
            d[obj] = prefix + trailer
    return d

def tuple_name(param_list):
    l = []
    for obj in param_list:
        if isinstance(obj, list):
            l.append(tuple_name(obj))
        else:
            l.append(obj)
    return "_".join(l)

Filemanager

DIR : / usr/ lib/ python3.10/ lib2to3/ fixes/
Name Type Size Permission Actions
__pycache__ Folder 0755
__init__.py File 47 B 0644
fix_apply.py File 2.29 KB 0644
fix_asserts.py File 984 B 0644
fix_basestring.py File 320 B 0644
fix_buffer.py File 590 B 0644
fix_dict.py File 3.67 KB 0644
fix_except.py File 3.27 KB 0644
fix_exec.py File 979 B 0644
fix_execfile.py File 2 KB 0644
fix_exitfunc.py File 2.44 KB 0644
fix_filter.py File 2.7 KB 0644
fix_funcattrs.py File 644 B 0644
fix_future.py File 547 B 0644
fix_getcwdu.py File 451 B 0644
fix_has_key.py File 3.12 KB 0644
fix_idioms.py File 4.76 KB 0644
fix_import.py File 3.18 KB 0644
fix_imports.py File 5.55 KB 0644
fix_imports2.py File 289 B 0644
fix_input.py File 708 B 0644
fix_intern.py File 1.12 KB 0644
fix_isinstance.py File 1.57 KB 0644
fix_itertools.py File 1.51 KB 0644
fix_itertools_imports.py File 2.04 KB 0644
fix_long.py File 476 B 0644
fix_map.py File 3.55 KB 0644
fix_metaclass.py File 8 KB 0644
fix_methodattrs.py File 606 B 0644
fix_ne.py File 571 B 0644
fix_next.py File 3.1 KB 0644
fix_nonzero.py File 591 B 0644
fix_numliterals.py File 768 B 0644
fix_operator.py File 3.35 KB 0644
fix_paren.py File 1.2 KB 0644
fix_print.py File 2.78 KB 0644
fix_raise.py File 2.86 KB 0644
fix_raw_input.py File 454 B 0644
fix_reduce.py File 837 B 0644
fix_reload.py File 1.06 KB 0644
fix_renames.py File 2.17 KB 0644
fix_repr.py File 613 B 0644
fix_set_literal.py File 1.66 KB 0644
fix_standarderror.py File 449 B 0644
fix_sys_exc.py File 1.01 KB 0644
fix_throw.py File 1.54 KB 0644
fix_tuple_params.py File 5.43 KB 0644
fix_types.py File 1.73 KB 0644
fix_unicode.py File 1.23 KB 0644
fix_urllib.py File 8.17 KB 0644
fix_ws_comma.py File 1.06 KB 0644
fix_xrange.py File 2.63 KB 0644
fix_xreadlines.py File 689 B 0644
fix_zip.py File 1.26 KB 0644

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