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annotate planemo/lib/python3.7/site-packages/libpasteurize/fixes/fix_kwargs.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 u"""
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2 Fixer for Python 3 function parameter syntax
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3 This fixer is rather sensitive to incorrect py3k syntax.
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4 """
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5
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6 # Note: "relevant" parameters are parameters following the first STAR in the list.
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7
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8 from lib2to3 import fixer_base
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9 from lib2to3.fixer_util import token, String, Newline, Comma, Name
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10 from libfuturize.fixer_util import indentation, suitify, DoubleStar
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11
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12 _assign_template = u"%(name)s = %(kwargs)s['%(name)s']; del %(kwargs)s['%(name)s']"
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13 _if_template = u"if '%(name)s' in %(kwargs)s: %(assign)s"
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14 _else_template = u"else: %(name)s = %(default)s"
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15 _kwargs_default_name = u"_3to2kwargs"
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16
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17 def gen_params(raw_params):
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18 u"""
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19 Generator that yields tuples of (name, default_value) for each parameter in the list
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20 If no default is given, then it is default_value is None (not Leaf(token.NAME, 'None'))
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21 """
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22 assert raw_params[0].type == token.STAR and len(raw_params) > 2
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23 curr_idx = 2 # the first place a keyword-only parameter name can be is index 2
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24 max_idx = len(raw_params)
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25 while curr_idx < max_idx:
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26 curr_item = raw_params[curr_idx]
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27 prev_item = curr_item.prev_sibling
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28 if curr_item.type != token.NAME:
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29 curr_idx += 1
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30 continue
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31 if prev_item is not None and prev_item.type == token.DOUBLESTAR:
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32 break
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33 name = curr_item.value
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34 nxt = curr_item.next_sibling
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35 if nxt is not None and nxt.type == token.EQUAL:
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36 default_value = nxt.next_sibling
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37 curr_idx += 2
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38 else:
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39 default_value = None
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40 yield (name, default_value)
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41 curr_idx += 1
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42
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43 def remove_params(raw_params, kwargs_default=_kwargs_default_name):
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44 u"""
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45 Removes all keyword-only args from the params list and a bare star, if any.
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46 Does not add the kwargs dict if needed.
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47 Returns True if more action is needed, False if not
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48 (more action is needed if no kwargs dict exists)
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49 """
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50 assert raw_params[0].type == token.STAR
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51 if raw_params[1].type == token.COMMA:
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52 raw_params[0].remove()
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53 raw_params[1].remove()
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54 kw_params = raw_params[2:]
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55 else:
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56 kw_params = raw_params[3:]
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57 for param in kw_params:
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58 if param.type != token.DOUBLESTAR:
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59 param.remove()
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60 else:
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61 return False
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62 else:
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63 return True
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64
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65 def needs_fixing(raw_params, kwargs_default=_kwargs_default_name):
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66 u"""
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67 Returns string with the name of the kwargs dict if the params after the first star need fixing
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68 Otherwise returns empty string
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69 """
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70 found_kwargs = False
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71 needs_fix = False
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72
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73 for t in raw_params[2:]:
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74 if t.type == token.COMMA:
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75 # Commas are irrelevant at this stage.
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76 continue
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77 elif t.type == token.NAME and not found_kwargs:
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78 # Keyword-only argument: definitely need to fix.
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79 needs_fix = True
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80 elif t.type == token.NAME and found_kwargs:
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81 # Return 'foobar' of **foobar, if needed.
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82 return t.value if needs_fix else u''
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83 elif t.type == token.DOUBLESTAR:
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84 # Found either '*' from **foobar.
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85 found_kwargs = True
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86 else:
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87 # Never found **foobar. Return a synthetic name, if needed.
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88 return kwargs_default if needs_fix else u''
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89
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90 class FixKwargs(fixer_base.BaseFix):
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91
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92 run_order = 7 # Run after function annotations are removed
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93
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94 PATTERN = u"funcdef< 'def' NAME parameters< '(' arglist=typedargslist< params=any* > ')' > ':' suite=any >"
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95
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96 def transform(self, node, results):
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97 params_rawlist = results[u"params"]
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98 for i, item in enumerate(params_rawlist):
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99 if item.type == token.STAR:
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100 params_rawlist = params_rawlist[i:]
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101 break
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102 else:
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103 return
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104 # params is guaranteed to be a list starting with *.
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105 # if fixing is needed, there will be at least 3 items in this list:
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106 # [STAR, COMMA, NAME] is the minimum that we need to worry about.
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107 new_kwargs = needs_fixing(params_rawlist)
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108 # new_kwargs is the name of the kwargs dictionary.
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109 if not new_kwargs:
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110 return
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111 suitify(node)
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112
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113 # At this point, params_rawlist is guaranteed to be a list
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114 # beginning with a star that includes at least one keyword-only param
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115 # e.g., [STAR, NAME, COMMA, NAME, COMMA, DOUBLESTAR, NAME] or
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116 # [STAR, COMMA, NAME], or [STAR, COMMA, NAME, COMMA, DOUBLESTAR, NAME]
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117
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118 # Anatomy of a funcdef: ['def', 'name', parameters, ':', suite]
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119 # Anatomy of that suite: [NEWLINE, INDENT, first_stmt, all_other_stmts]
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120 # We need to insert our new stuff before the first_stmt and change the
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121 # first_stmt's prefix.
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122
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123 suite = node.children[4]
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124 first_stmt = suite.children[2]
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125 ident = indentation(first_stmt)
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126
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127 for name, default_value in gen_params(params_rawlist):
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128 if default_value is None:
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129 suite.insert_child(2, Newline())
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130 suite.insert_child(2, String(_assign_template %{u'name':name, u'kwargs':new_kwargs}, prefix=ident))
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131 else:
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132 suite.insert_child(2, Newline())
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133 suite.insert_child(2, String(_else_template %{u'name':name, u'default':default_value}, prefix=ident))
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134 suite.insert_child(2, Newline())
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135 suite.insert_child(2, String(_if_template %{u'assign':_assign_template %{u'name':name, u'kwargs':new_kwargs}, u'name':name, u'kwargs':new_kwargs}, prefix=ident))
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136 first_stmt.prefix = ident
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137 suite.children[2].prefix = u""
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138
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139 # Now, we need to fix up the list of params.
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140
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141 must_add_kwargs = remove_params(params_rawlist)
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142 if must_add_kwargs:
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143 arglist = results[u'arglist']
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144 if len(arglist.children) > 0 and arglist.children[-1].type != token.COMMA:
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145 arglist.append_child(Comma())
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146 arglist.append_child(DoubleStar(prefix=u" "))
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147 arglist.append_child(Name(new_kwargs))