1 | # Copyright 2007 Google, Inc. All Rights Reserved. |
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2 | # Licensed to PSF under a Contributor Agreement. |
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3 | |
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4 | """Fixer that changes xrange(...) into range(...).""" |
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5 | |
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6 | # Local imports |
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7 | from .. import fixer_base |
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8 | from ..fixer_util import Name, Call, consuming_calls |
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9 | from .. import patcomp |
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10 | |
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11 | |
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12 | class FixXrange(fixer_base.BaseFix): |
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13 | BM_compatible = True |
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14 | PATTERN = """ |
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15 | power< |
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16 | (name='range'|name='xrange') trailer< '(' args=any ')' > |
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17 | rest=any* > |
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18 | """ |
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19 | |
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20 | def start_tree(self, tree, filename): |
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21 | super(FixXrange, self).start_tree(tree, filename) |
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22 | self.transformed_xranges = set() |
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23 | |
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24 | def finish_tree(self, tree, filename): |
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25 | self.transformed_xranges = None |
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26 | |
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27 | def transform(self, node, results): |
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28 | name = results["name"] |
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29 | if name.value == u"xrange": |
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30 | return self.transform_xrange(node, results) |
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31 | elif name.value == u"range": |
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32 | return self.transform_range(node, results) |
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33 | else: |
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34 | raise ValueError(repr(name)) |
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35 | |
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36 | def transform_xrange(self, node, results): |
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37 | name = results["name"] |
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38 | name.replace(Name(u"range", prefix=name.prefix)) |
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39 | # This prevents the new range call from being wrapped in a list later. |
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40 | self.transformed_xranges.add(id(node)) |
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41 | |
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42 | def transform_range(self, node, results): |
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43 | if (id(node) not in self.transformed_xranges and |
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44 | not self.in_special_context(node)): |
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45 | range_call = Call(Name(u"range"), [results["args"].clone()]) |
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46 | # Encase the range call in list(). |
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47 | list_call = Call(Name(u"list"), [range_call], |
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48 | prefix=node.prefix) |
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49 | # Put things that were after the range() call after the list call. |
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50 | for n in results["rest"]: |
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51 | list_call.append_child(n) |
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52 | return list_call |
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53 | |
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54 | P1 = "power< func=NAME trailer< '(' node=any ')' > any* >" |
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55 | p1 = patcomp.compile_pattern(P1) |
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56 | |
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57 | P2 = """for_stmt< 'for' any 'in' node=any ':' any* > |
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58 | | comp_for< 'for' any 'in' node=any any* > |
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59 | | comparison< any 'in' node=any any*> |
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60 | """ |
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61 | p2 = patcomp.compile_pattern(P2) |
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62 | |
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63 | def in_special_context(self, node): |
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64 | if node.parent is None: |
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65 | return False |
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66 | results = {} |
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67 | if (node.parent.parent is not None and |
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68 | self.p1.match(node.parent.parent, results) and |
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69 | results["node"] is node): |
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70 | # list(d.keys()) -> list(d.keys()), etc. |
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71 | return results["func"].value in consuming_calls |
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72 | # for ... in d.iterkeys() -> for ... in d.keys(), etc. |
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73 | return self.p2.match(node.parent, results) and results["node"] is node |
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