def is_async_fn(node):
code_node = node[0][0]
for n in node[0]:
if hasattr(n, "attr") and iscode(n.attr):
code_node = n
break
pass
pass
is_code = hasattr(code_node, "attr") and iscode(code_node.attr)
return is_code and co_flags_is_async(code_node.attr.co_flags)
def listcomp_closure3(node):
"""List comprehensions in Python 3 when handled as a closure.
See if we can combine code.
"""
p = self.prec
self.prec = 27
code_obj = node[1].attr
assert iscode(code_obj)
code = Code(code_obj, self.scanner, self.currentclass)
ast = self.build_ast(code._tokens, code._customize)
self.customize(code._customize)
# skip over: sstmt, stmt, return, ret_expr
# and other singleton derivations
while len(ast) == 1 or (ast in ("sstmt", "return") and ast[-1]
in ("RETURN_LAST", "RETURN_VALUE")):
self.prec = 100
ast = ast[0]
n = ast[1]
# collections is the name of the expression(s) we are iterating over
collections = [node[-3]]
list_ifs = []
if self.version == 3.0 and n != "list_iter":
# FIXME 3.0 is a snowflake here. We need
# special code for this. Not sure if this is totally
# correct.
stores = [ast[3]]
assert ast[4] == "comp_iter"
n = ast[4]
# Find the list comprehension body. It is the inner-most
# node that is not comp_.. .
while n == "comp_iter":
if n[0] == "comp_for":
n = n[0]
stores.append(n[2])
n = n[3]
elif n[0] in ("comp_if", "comp_if_not"):
n = n[0]
# FIXME: just a guess
if n[0].kind == "expr":
list_ifs.append(n)
else:
list_ifs.append([1])
n = n[2]
pass
else:
break
pass
# Skip over n[0] which is something like: _[1]
self.preorder(n[1])
else:
assert n == "list_iter"
stores = []
# Find the list comprehension body. It is the inner-most
# node that is not list_.. .
while n == "list_iter":
# recurse one step
n = n[0]
if n == "list_for":
stores.append(n[2])
n = n[3]
if n[0] == "list_for":
# Dog-paddle down largely singleton reductions
# to find the collection (expr)
c = n[0][0]
if c == "expr":
c = c[0]
# FIXME: grammar is wonky here? Is this really an attribute?
if c == "attribute":
c = c[0]
collections.append(c)
pass
elif n in ("list_if", "list_if_not"):
# FIXME: just a guess
if n[0].kind == "expr":
list_ifs.append(n)
else:
list_ifs.append([1])
n = n[2]
pass
elif n == "list_if37":
list_ifs.append(n)
n = n[-1]
pass
elif n == "list_afor":
collections.append(n[0][0])
n = n[1]
stores.append(n[1][0])
n = n[3]
pass
assert n == "lc_body", ast
self.preorder(n[0])
# FIXME: add indentation around "for"'s and "in"'s
n_colls = len(collections)
for i, store in enumerate(stores):
if i >= n_colls:
break
if collections[i] == "LOAD_DEREF" and co_flags_is_async(
code_obj.co_flags):
self.write(" async")
pass
self.write(" for ")
self.preorder(store)
self.write(" in ")
self.preorder(collections[i])
if i < len(list_ifs):
self.preorder(list_ifs[i])
pass
pass
self.prec = p