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Edit File : fix_tuple_params.py \| Size : 5.43 KB
"""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) Back

Edit File : fix_tuple_params.py | Size : 5.43 KB

"""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)

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