mirror of https://github.com/python/cpython
53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
|
"""
|
||
|
|
Optional fixer to transform set() calls to set literals.
|
||
|
|
"""
|
||
|
|
|
||
|
|
# Author: Benjamin Peterson
|
||
|
|
|
||
|
|
from lib2to3 import fixer_base, pytree
|
||
|
|
from lib2to3.fixer_util import token, syms
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
class FixSetLiteral(fixer_base.BaseFix):
|
||
|
|
|
||
|
|
explicit = True
|
||
|
|
|
||
|
|
PATTERN = """power< 'set' trailer< '('
|
||
|
|
(atom=atom< '[' (items=listmaker< any ((',' any)* [',']) >
|
||
|
|
|
|
||
|
|
single=any) ']' >
|
||
|
|
|
|
||
|
|
atom< '(' items=testlist_gexp< any ((',' any)* [',']) > ')' >
|
||
|
|
)
|
||
|
|
')' > >
|
||
|
|
"""
|
||
|
|
|
||
|
|
def transform(self, node, results):
|
||
|
|
single = results.get("single")
|
||
|
|
if single:
|
||
|
|
# Make a fake listmaker
|
||
|
|
fake = pytree.Node(syms.listmaker, [single.clone()])
|
||
|
|
single.replace(fake)
|
||
|
|
items = fake
|
||
|
|
else:
|
||
|
|
items = results["items"]
|
||
|
|
|
||
|
|
# Build the contents of the literal
|
||
|
|
literal = [pytree.Leaf(token.LBRACE, u"{")]
|
||
|
|
literal.extend(n.clone() for n in items.children)
|
||
|
|
literal.append(pytree.Leaf(token.RBRACE, u"}"))
|
||
|
|
# Set the prefix of the right brace to that of the ')' or ']'
|
||
|
|
literal[-1].prefix = items.next_sibling.prefix
|
||
|
|
maker = pytree.Node(syms.dictsetmaker, literal)
|
||
|
|
maker.prefix = node.prefix
|
||
|
|
|
||
|
|
# If the original was a one tuple, we need to remove the extra comma.
|
||
|
|
if len(maker.children) == 4:
|
||
|
|
n = maker.children[2]
|
||
|
|
n.remove()
|
||
|
|
maker.children[-1].prefix = n.prefix
|
||
|
|
|
||
|
|
# Finally, replace the set call with our shiny new literal.
|
||
|
|
return maker
|