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author | rahulp13 | 2020-03-17 14:55:41 +0530 |
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committer | rahulp13 | 2020-03-17 14:55:41 +0530 |
commit | 296443137f4288cb030e92859ccfbe3204bc1088 (patch) | |
tree | ca4798c2da1e7244edc3bc108d81b462b537aea2 /lib/python2.7/lib2to3/fixes/fix_xrange.py | |
parent | 0db48f6533517ecebfd9f0693f89deca28408b76 (diff) | |
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initial commit
Diffstat (limited to 'lib/python2.7/lib2to3/fixes/fix_xrange.py')
-rw-r--r-- | lib/python2.7/lib2to3/fixes/fix_xrange.py | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/lib/python2.7/lib2to3/fixes/fix_xrange.py b/lib/python2.7/lib2to3/fixes/fix_xrange.py new file mode 100644 index 0000000..f143672 --- /dev/null +++ b/lib/python2.7/lib2to3/fixes/fix_xrange.py @@ -0,0 +1,73 @@ +# Copyright 2007 Google, Inc. All Rights Reserved. +# Licensed to PSF under a Contributor Agreement. + +"""Fixer that changes xrange(...) into range(...).""" + +# Local imports +from .. import fixer_base +from ..fixer_util import Name, Call, consuming_calls +from .. import patcomp + + +class FixXrange(fixer_base.BaseFix): + BM_compatible = True + PATTERN = """ + power< + (name='range'|name='xrange') trailer< '(' args=any ')' > + rest=any* > + """ + + def start_tree(self, tree, filename): + super(FixXrange, self).start_tree(tree, filename) + self.transformed_xranges = set() + + def finish_tree(self, tree, filename): + self.transformed_xranges = None + + def transform(self, node, results): + name = results["name"] + if name.value == u"xrange": + return self.transform_xrange(node, results) + elif name.value == u"range": + return self.transform_range(node, results) + else: + raise ValueError(repr(name)) + + def transform_xrange(self, node, results): + name = results["name"] + name.replace(Name(u"range", prefix=name.prefix)) + # This prevents the new range call from being wrapped in a list later. + self.transformed_xranges.add(id(node)) + + def transform_range(self, node, results): + if (id(node) not in self.transformed_xranges and + not self.in_special_context(node)): + range_call = Call(Name(u"range"), [results["args"].clone()]) + # Encase the range call in list(). + list_call = Call(Name(u"list"), [range_call], + prefix=node.prefix) + # Put things that were after the range() call after the list call. + for n in results["rest"]: + list_call.append_child(n) + return list_call + + P1 = "power< func=NAME trailer< '(' node=any ')' > any* >" + p1 = patcomp.compile_pattern(P1) + + P2 = """for_stmt< 'for' any 'in' node=any ':' any* > + | comp_for< 'for' any 'in' node=any any* > + | comparison< any 'in' node=any any*> + """ + p2 = patcomp.compile_pattern(P2) + + def in_special_context(self, node): + if node.parent is None: + return False + results = {} + if (node.parent.parent is not None and + self.p1.match(node.parent.parent, results) and + results["node"] is node): + # list(d.keys()) -> list(d.keys()), etc. + return results["func"].value in consuming_calls + # for ... in d.iterkeys() -> for ... in d.keys(), etc. + return self.p2.match(node.parent, results) and results["node"] is node |