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