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annotate planemo/lib/python3.7/site-packages/libfuturize/fixes/fix_division_safe.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 """
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2 For the ``future`` package.
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3
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4 Adds this import line:
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5
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6 from __future__ import division
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7
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8 at the top and changes any old-style divisions to be calls to
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9 past.utils.old_div so the code runs as before on Py2.6/2.7 and has the same
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10 behaviour on Py3.
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11
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12 If "from __future__ import division" is already in effect, this fixer does
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13 nothing.
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14 """
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15
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16 import re
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17 from lib2to3.fixer_util import Leaf, Node, Comma
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18 from lib2to3 import fixer_base
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19 from libfuturize.fixer_util import (token, future_import, touch_import_top,
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20 wrap_in_fn_call)
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21
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22
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23 def match_division(node):
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24 u"""
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25 __future__.division redefines the meaning of a single slash for division,
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26 so we match that and only that.
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27 """
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28 slash = token.SLASH
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29 return node.type == slash and not node.next_sibling.type == slash and \
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30 not node.prev_sibling.type == slash
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31
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32 const_re = re.compile('^[0-9]*[.][0-9]*$')
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33
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34 def is_floaty(node):
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35 return _is_floaty(node.prev_sibling) or _is_floaty(node.next_sibling)
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36
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37
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38 def _is_floaty(expr):
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39 if isinstance(expr, list):
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40 expr = expr[0]
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41
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42 if isinstance(expr, Leaf):
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43 # If it's a leaf, let's see if it's a numeric constant containing a '.'
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44 return const_re.match(expr.value)
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45 elif isinstance(expr, Node):
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46 # If the expression is a node, let's see if it's a direct cast to float
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47 if isinstance(expr.children[0], Leaf):
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48 return expr.children[0].value == u'float'
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49 return False
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50
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51
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52 class FixDivisionSafe(fixer_base.BaseFix):
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53 # BM_compatible = True
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54 run_order = 4 # this seems to be ignored?
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55
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56 _accept_type = token.SLASH
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57
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58 PATTERN = """
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59 term<(not('/') any)+ '/' ((not('/') any))>
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60 """
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61
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62 def start_tree(self, tree, name):
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63 """
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64 Skip this fixer if "__future__.division" is already imported.
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65 """
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66 super(FixDivisionSafe, self).start_tree(tree, name)
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67 self.skip = "division" in tree.future_features
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68
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69 def match(self, node):
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70 u"""
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71 Since the tree needs to be fixed once and only once if and only if it
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72 matches, we can start discarding matches after the first.
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73 """
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74 if node.type == self.syms.term:
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75 matched = False
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76 skip = False
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77 children = []
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78 for child in node.children:
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79 if skip:
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80 skip = False
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81 continue
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82 if match_division(child) and not is_floaty(child):
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83 matched = True
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84
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85 # Strip any leading space for the first number:
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86 children[0].prefix = u''
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87
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88 children = [wrap_in_fn_call("old_div",
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89 children + [Comma(), child.next_sibling.clone()],
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90 prefix=node.prefix)]
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91 skip = True
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92 else:
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93 children.append(child.clone())
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94 if matched:
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95 return Node(node.type, children, fixers_applied=node.fixers_applied)
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96
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97 return False
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98
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99 def transform(self, node, results):
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100 if self.skip:
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101 return
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102 future_import(u"division", node)
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103 touch_import_top(u'past.utils', u'old_div', node)
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104 return results