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()]))
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)
def transform(self, node, results):
syms = self.syms
tail = [n.clone() for n in results["tail"]]
try_cleanup = [ch.clone() for ch in results["cleanup"]]
for except_clause, e_suite in find_excepts(try_cleanup):
if len(except_clause.children) == 4:
(E, comma, N) = except_clause.children[1:4]
comma.replace(Name("as", prefix=" "))
if N.type != token.NAME:
# Generate a new N for the except clause
new_N = Name(self.new_name(), prefix=" ")
target = N.clone()
target.prefix = ""
N.replace(new_N)
new_N = new_N.clone()
# Insert "old_N = new_N" as the first statement in
# the except body. This loop skips leading whitespace
# and indents
# TODO(cwinter) suite-cleanup
suite_stmts = e_suite.children
for i, stmt in enumerate(suite_stmts):
if isinstance(stmt, pytree.Node):
break
# The assignment is different if old_N is a tuple or list
# In that case, the assignment is old_N = new_N.args
if is_tuple(N) or is_list(N):
assign = Assign(target, Attr(new_N, Name("args")))
else:
assign = Assign(target, new_N)
# TODO(cwinter) stopgap until children becomes a smart list
for child in reversed(suite_stmts[:i]):
e_suite.insert_child(0, child)
e_suite.insert_child(i, assign)
elif N.prefix == "":
# No space after a comma is legal; no space after "as",
# not so much.
N.prefix = " "
# TODO(cwinter) fix this when children becomes a smart list
children = [c.clone() for c in node.children[:3]] + try_cleanup + tail
return pytree.Node(node.type, children)
