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"""
For the ``future`` package.
Adds this import line:
from __future__ import division
at the top and changes any old-style divisions to be calls to
past.utils.old_div so the code runs as before on Py2.6/2.7 and has the same
behaviour on Py3.
If "from __future__ import division" is already in effect, this fixer does
nothing.
"""
from lib2to3 import fixer_base
from lib2to3.fixer_util import syms, does_tree_import
from libfuturize.fixer_util import (token, future_import, touch_import_top,
wrap_in_fn_call)
def match_division(node):
u"""
__future__.division redefines the meaning of a single slash for division,
so we match that and only that.
"""
slash = token.SLASH
return node.type == slash and not node.next_sibling.type == slash and \
not node.prev_sibling.type == slash
class FixDivisionSafe(fixer_base.BaseFix):
# BM_compatible = True
run_order = 4 # this seems to be ignored?
_accept_type = token.SLASH
PATTERN = """
term<(not('/') any)+ '/' ((not('/') any))>
"""
def start_tree(self, tree, name):
"""
Skip this fixer if "__future__.division" is already imported.
"""
super(FixDivisionSafe, self).start_tree(tree, name)
self.skip = "division" in tree.future_features
def match(self, node):
u"""
Since the tree needs to be fixed once and only once if and only if it
matches, we can start discarding matches after the first.
"""
if (node.type == self.syms.term and
len(node.children) == 3 and
match_division(node.children[1])):
expr1, expr2 = node.children[0], node.children[2]
return expr1, expr2
else:
return False
def transform(self, node, results):
if self.skip:
return
future_import(u"division", node)
touch_import_top(u'past.utils', u'old_div', node)
expr1, expr2 = results[0].clone(), results[1].clone()
# Strip any leading space for the first number:
expr1.prefix = u''
return wrap_in_fn_call("old_div", (expr1, expr2), prefix=node.prefix)