Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/libfuturize/fixer_util.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 Utility functions from 2to3, 3to2 and python-modernize (and some home-grown
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3 ones).
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4
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5 Licences:
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6 2to3: PSF License v2
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7 3to2: Apache Software License (from 3to2/setup.py)
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8 python-modernize licence: BSD (from python-modernize/LICENSE)
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9 """
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10
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11 from lib2to3.fixer_util import (FromImport, Newline, is_import,
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12 find_root, does_tree_import, Comma)
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13 from lib2to3.pytree import Leaf, Node
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14 from lib2to3.pygram import python_symbols as syms, python_grammar
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15 from lib2to3.pygram import token
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16 from lib2to3.fixer_util import (Node, Call, Name, syms, Comma, Number)
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17 import re
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18
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19
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20 def canonical_fix_name(fix, avail_fixes):
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21 """
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22 Examples:
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23 >>> canonical_fix_name('fix_wrap_text_literals')
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24 'libfuturize.fixes.fix_wrap_text_literals'
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25 >>> canonical_fix_name('wrap_text_literals')
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26 'libfuturize.fixes.fix_wrap_text_literals'
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27 >>> canonical_fix_name('wrap_te')
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28 ValueError("unknown fixer name")
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29 >>> canonical_fix_name('wrap')
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30 ValueError("ambiguous fixer name")
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31 """
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32 if ".fix_" in fix:
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33 return fix
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34 else:
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35 if fix.startswith('fix_'):
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36 fix = fix[4:]
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37 # Infer the full module name for the fixer.
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38 # First ensure that no names clash (e.g.
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39 # lib2to3.fixes.fix_blah and libfuturize.fixes.fix_blah):
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40 found = [f for f in avail_fixes
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41 if f.endswith('fix_{0}'.format(fix))]
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42 if len(found) > 1:
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43 raise ValueError("Ambiguous fixer name. Choose a fully qualified "
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44 "module name instead from these:\n" +
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45 "\n".join(" " + myf for myf in found))
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46 elif len(found) == 0:
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47 raise ValueError("Unknown fixer. Use --list-fixes or -l for a list.")
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48 return found[0]
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49
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50
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51
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52 ## These functions are from 3to2 by Joe Amenta:
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53
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54 def Star(prefix=None):
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55 return Leaf(token.STAR, u'*', prefix=prefix)
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56
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57 def DoubleStar(prefix=None):
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58 return Leaf(token.DOUBLESTAR, u'**', prefix=prefix)
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59
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60 def Minus(prefix=None):
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61 return Leaf(token.MINUS, u'-', prefix=prefix)
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62
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63 def commatize(leafs):
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64 """
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65 Accepts/turns: (Name, Name, ..., Name, Name)
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66 Returns/into: (Name, Comma, Name, Comma, ..., Name, Comma, Name)
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67 """
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68 new_leafs = []
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69 for leaf in leafs:
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70 new_leafs.append(leaf)
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71 new_leafs.append(Comma())
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72 del new_leafs[-1]
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73 return new_leafs
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74
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75 def indentation(node):
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76 """
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77 Returns the indentation for this node
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78 Iff a node is in a suite, then it has indentation.
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79 """
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80 while node.parent is not None and node.parent.type != syms.suite:
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81 node = node.parent
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82 if node.parent is None:
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83 return u""
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84 # The first three children of a suite are NEWLINE, INDENT, (some other node)
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85 # INDENT.value contains the indentation for this suite
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86 # anything after (some other node) has the indentation as its prefix.
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87 if node.type == token.INDENT:
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88 return node.value
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89 elif node.prev_sibling is not None and node.prev_sibling.type == token.INDENT:
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90 return node.prev_sibling.value
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91 elif node.prev_sibling is None:
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92 return u""
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93 else:
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94 return node.prefix
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95
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96 def indentation_step(node):
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97 """
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98 Dirty little trick to get the difference between each indentation level
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99 Implemented by finding the shortest indentation string
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100 (technically, the "least" of all of the indentation strings, but
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101 tabs and spaces mixed won't get this far, so those are synonymous.)
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102 """
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103 r = find_root(node)
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104 # Collect all indentations into one set.
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105 all_indents = set(i.value for i in r.pre_order() if i.type == token.INDENT)
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106 if not all_indents:
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107 # nothing is indented anywhere, so we get to pick what we want
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108 return u" " # four spaces is a popular convention
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109 else:
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110 return min(all_indents)
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111
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112 def suitify(parent):
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113 """
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114 Turn the stuff after the first colon in parent's children
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115 into a suite, if it wasn't already
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116 """
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117 for node in parent.children:
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118 if node.type == syms.suite:
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119 # already in the prefered format, do nothing
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120 return
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121
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122 # One-liners have no suite node, we have to fake one up
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123 for i, node in enumerate(parent.children):
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124 if node.type == token.COLON:
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125 break
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126 else:
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127 raise ValueError(u"No class suite and no ':'!")
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128 # Move everything into a suite node
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129 suite = Node(syms.suite, [Newline(), Leaf(token.INDENT, indentation(node) + indentation_step(node))])
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130 one_node = parent.children[i+1]
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131 one_node.remove()
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132 one_node.prefix = u''
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133 suite.append_child(one_node)
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134 parent.append_child(suite)
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135
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136 def NameImport(package, as_name=None, prefix=None):
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137 """
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138 Accepts a package (Name node), name to import it as (string), and
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139 optional prefix and returns a node:
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140 import <package> [as <as_name>]
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141 """
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142 if prefix is None:
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143 prefix = u""
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144 children = [Name(u"import", prefix=prefix), package]
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145 if as_name is not None:
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146 children.extend([Name(u"as", prefix=u" "),
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147 Name(as_name, prefix=u" ")])
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148 return Node(syms.import_name, children)
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149
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150 _compound_stmts = (syms.if_stmt, syms.while_stmt, syms.for_stmt, syms.try_stmt, syms.with_stmt)
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151 _import_stmts = (syms.import_name, syms.import_from)
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152
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153 def import_binding_scope(node):
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154 """
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155 Generator yields all nodes for which a node (an import_stmt) has scope
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156 The purpose of this is for a call to _find() on each of them
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157 """
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158 # import_name / import_from are small_stmts
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159 assert node.type in _import_stmts
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160 test = node.next_sibling
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161 # A small_stmt can only be followed by a SEMI or a NEWLINE.
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162 while test.type == token.SEMI:
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163 nxt = test.next_sibling
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164 # A SEMI can only be followed by a small_stmt or a NEWLINE
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165 if nxt.type == token.NEWLINE:
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166 break
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167 else:
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168 yield nxt
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169 # A small_stmt can only be followed by either a SEMI or a NEWLINE
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170 test = nxt.next_sibling
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171 # Covered all subsequent small_stmts after the import_stmt
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172 # Now to cover all subsequent stmts after the parent simple_stmt
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173 parent = node.parent
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174 assert parent.type == syms.simple_stmt
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175 test = parent.next_sibling
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176 while test is not None:
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177 # Yes, this will yield NEWLINE and DEDENT. Deal with it.
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178 yield test
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179 test = test.next_sibling
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180
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181 context = parent.parent
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182 # Recursively yield nodes following imports inside of a if/while/for/try/with statement
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183 if context.type in _compound_stmts:
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184 # import is in a one-liner
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185 c = context
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186 while c.next_sibling is not None:
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187 yield c.next_sibling
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188 c = c.next_sibling
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189 context = context.parent
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190
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191 # Can't chain one-liners on one line, so that takes care of that.
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192
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193 p = context.parent
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194 if p is None:
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195 return
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196
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197 # in a multi-line suite
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198
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199 while p.type in _compound_stmts:
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200
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201 if context.type == syms.suite:
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202 yield context
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203
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204 context = context.next_sibling
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205
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206 if context is None:
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207 context = p.parent
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208 p = context.parent
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209 if p is None:
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210 break
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211
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212 def ImportAsName(name, as_name, prefix=None):
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213 new_name = Name(name)
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214 new_as = Name(u"as", prefix=u" ")
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215 new_as_name = Name(as_name, prefix=u" ")
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216 new_node = Node(syms.import_as_name, [new_name, new_as, new_as_name])
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217 if prefix is not None:
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218 new_node.prefix = prefix
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219 return new_node
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220
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221
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222 def is_docstring(node):
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223 """
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224 Returns True if the node appears to be a docstring
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225 """
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226 return (node.type == syms.simple_stmt and
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227 len(node.children) > 0 and node.children[0].type == token.STRING)
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228
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229
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230 def future_import(feature, node):
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231 """
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232 This seems to work
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233 """
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234 root = find_root(node)
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235
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236 if does_tree_import(u"__future__", feature, node):
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237 return
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238
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239 # Look for a shebang or encoding line
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240 shebang_encoding_idx = None
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241
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242 for idx, node in enumerate(root.children):
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243 # Is it a shebang or encoding line?
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244 if is_shebang_comment(node) or is_encoding_comment(node):
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245 shebang_encoding_idx = idx
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246 if is_docstring(node):
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247 # skip over docstring
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248 continue
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249 names = check_future_import(node)
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250 if not names:
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251 # not a future statement; need to insert before this
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252 break
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253 if feature in names:
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254 # already imported
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255 return
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256
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257 import_ = FromImport(u'__future__', [Leaf(token.NAME, feature, prefix=" ")])
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258 if shebang_encoding_idx == 0 and idx == 0:
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259 # If this __future__ import would go on the first line,
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260 # detach the shebang / encoding prefix from the current first line.
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261 # and attach it to our new __future__ import node.
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262 import_.prefix = root.children[0].prefix
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263 root.children[0].prefix = u''
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264 # End the __future__ import line with a newline and add a blank line
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265 # afterwards:
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266 children = [import_ , Newline()]
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267 root.insert_child(idx, Node(syms.simple_stmt, children))
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268
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269
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270 def future_import2(feature, node):
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271 """
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272 An alternative to future_import() which might not work ...
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273 """
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274 root = find_root(node)
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275
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276 if does_tree_import(u"__future__", feature, node):
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277 return
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278
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279 insert_pos = 0
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280 for idx, node in enumerate(root.children):
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281 if node.type == syms.simple_stmt and node.children and \
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282 node.children[0].type == token.STRING:
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283 insert_pos = idx + 1
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284 break
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285
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286 for thing_after in root.children[insert_pos:]:
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287 if thing_after.type == token.NEWLINE:
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288 insert_pos += 1
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289 continue
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290
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291 prefix = thing_after.prefix
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292 thing_after.prefix = u""
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293 break
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294 else:
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295 prefix = u""
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296
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297 import_ = FromImport(u"__future__", [Leaf(token.NAME, feature, prefix=u" ")])
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298
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299 children = [import_, Newline()]
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300 root.insert_child(insert_pos, Node(syms.simple_stmt, children, prefix=prefix))
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301
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302 def parse_args(arglist, scheme):
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303 u"""
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304 Parse a list of arguments into a dict
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305 """
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306 arglist = [i for i in arglist if i.type != token.COMMA]
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307
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308 ret_mapping = dict([(k, None) for k in scheme])
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309
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310 for i, arg in enumerate(arglist):
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311 if arg.type == syms.argument and arg.children[1].type == token.EQUAL:
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312 # argument < NAME '=' any >
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313 slot = arg.children[0].value
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314 ret_mapping[slot] = arg.children[2]
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315 else:
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316 slot = scheme[i]
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317 ret_mapping[slot] = arg
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318
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319 return ret_mapping
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320
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321
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322 # def is_import_from(node):
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323 # """Returns true if the node is a statement "from ... import ..."
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324 # """
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325 # return node.type == syms.import_from
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326
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327
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328 def is_import_stmt(node):
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329 return (node.type == syms.simple_stmt and node.children and
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330 is_import(node.children[0]))
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331
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332
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333 def touch_import_top(package, name_to_import, node):
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334 """Works like `does_tree_import` but adds an import statement at the
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335 top if it was not imported (but below any __future__ imports) and below any
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336 comments such as shebang lines).
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337
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338 Based on lib2to3.fixer_util.touch_import()
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339
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340 Calling this multiple times adds the imports in reverse order.
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341
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342 Also adds "standard_library.install_aliases()" after "from future import
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343 standard_library". This should probably be factored into another function.
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344 """
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345
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346 root = find_root(node)
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347
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348 if does_tree_import(package, name_to_import, root):
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349 return
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350
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351 # Ideally, we would look for whether futurize --all-imports has been run,
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352 # as indicated by the presence of ``from builtins import (ascii, ...,
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353 # zip)`` -- and, if it has, we wouldn't import the name again.
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354
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355 # Look for __future__ imports and insert below them
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356 found = False
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357 for name in ['absolute_import', 'division', 'print_function',
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358 'unicode_literals']:
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359 if does_tree_import('__future__', name, root):
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360 found = True
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361 break
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362 if found:
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363 # At least one __future__ import. We want to loop until we've seen them
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364 # all.
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365 start, end = None, None
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366 for idx, node in enumerate(root.children):
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367 if check_future_import(node):
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368 start = idx
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369 # Start looping
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370 idx2 = start
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371 while node:
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372 node = node.next_sibling
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373 idx2 += 1
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374 if not check_future_import(node):
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375 end = idx2
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376 break
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377 break
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378 assert start is not None
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379 assert end is not None
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380 insert_pos = end
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381 else:
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382 # No __future__ imports.
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383 # We look for a docstring and insert the new node below that. If no docstring
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384 # exists, just insert the node at the top.
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385 for idx, node in enumerate(root.children):
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diff changeset
386 if node.type != syms.simple_stmt:
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387 break
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388 if not is_docstring(node):
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389 # This is the usual case.
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390 break
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391 insert_pos = idx
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392
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393 if package is None:
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394 import_ = Node(syms.import_name, [
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395 Leaf(token.NAME, u"import"),
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396 Leaf(token.NAME, name_to_import, prefix=u" ")
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397 ])
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398 else:
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399 import_ = FromImport(package, [Leaf(token.NAME, name_to_import, prefix=u" ")])
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400 if name_to_import == u'standard_library':
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401 # Add:
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402 # standard_library.install_aliases()
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403 # after:
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404 # from future import standard_library
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405 install_hooks = Node(syms.simple_stmt,
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406 [Node(syms.power,
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407 [Leaf(token.NAME, u'standard_library'),
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408 Node(syms.trailer, [Leaf(token.DOT, u'.'),
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409 Leaf(token.NAME, u'install_aliases')]),
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410 Node(syms.trailer, [Leaf(token.LPAR, u'('),
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411 Leaf(token.RPAR, u')')])
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412 ])
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413 ]
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414 )
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415 children_hooks = [install_hooks, Newline()]
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416 else:
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417 children_hooks = []
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418
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419 # FromImport(package, [Leaf(token.NAME, name_to_import, prefix=u" ")])
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420
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421 children_import = [import_, Newline()]
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422 old_prefix = root.children[insert_pos].prefix
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423 root.children[insert_pos].prefix = u''
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424 root.insert_child(insert_pos, Node(syms.simple_stmt, children_import, prefix=old_prefix))
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425 if len(children_hooks) > 0:
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426 root.insert_child(insert_pos + 1, Node(syms.simple_stmt, children_hooks))
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427
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428
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429 ## The following functions are from python-modernize by Armin Ronacher:
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430 # (a little edited).
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431
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432 def check_future_import(node):
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433 """If this is a future import, return set of symbols that are imported,
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434 else return None."""
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435 # node should be the import statement here
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436 savenode = node
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437 if not (node.type == syms.simple_stmt and node.children):
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438 return set()
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439 node = node.children[0]
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440 # now node is the import_from node
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441 if not (node.type == syms.import_from and
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442 # node.type == token.NAME and # seems to break it
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443 hasattr(node.children[1], 'value') and
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444 node.children[1].value == u'__future__'):
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445 return set()
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446 if node.children[3].type == token.LPAR:
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447 node = node.children[4]
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448 else:
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449 node = node.children[3]
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450 # now node is the import_as_name[s]
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451 # print(python_grammar.number2symbol[node.type]) # breaks sometimes
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452 if node.type == syms.import_as_names:
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453 result = set()
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454 for n in node.children:
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455 if n.type == token.NAME:
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456 result.add(n.value)
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457 elif n.type == syms.import_as_name:
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458 n = n.children[0]
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459 assert n.type == token.NAME
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460 result.add(n.value)
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461 return result
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462 elif node.type == syms.import_as_name:
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463 node = node.children[0]
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464 assert node.type == token.NAME
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465 return set([node.value])
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466 elif node.type == token.NAME:
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467 return set([node.value])
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468 else:
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469 # TODO: handle brackets like this:
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470 # from __future__ import (absolute_import, division)
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471 assert False, "strange import: %s" % savenode
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472
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473
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474 SHEBANG_REGEX = r'^#!.*python'
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475 ENCODING_REGEX = r"^#.*coding[:=]\s*([-\w.]+)"
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476
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477
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478 def is_shebang_comment(node):
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479 """
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480 Comments are prefixes for Leaf nodes. Returns whether the given node has a
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481 prefix that looks like a shebang line or an encoding line:
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482
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483 #!/usr/bin/env python
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484 #!/usr/bin/python3
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485 """
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486 return bool(re.match(SHEBANG_REGEX, node.prefix))
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487
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488
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489 def is_encoding_comment(node):
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490 """
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491 Comments are prefixes for Leaf nodes. Returns whether the given node has a
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diff changeset
492 prefix that looks like an encoding line:
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493
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494 # coding: utf-8
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495 # encoding: utf-8
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496 # -*- coding: <encoding name> -*-
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diff changeset
497 # vim: set fileencoding=<encoding name> :
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498 """
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499 return bool(re.match(ENCODING_REGEX, node.prefix))
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500
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501
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502 def wrap_in_fn_call(fn_name, args, prefix=None):
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503 """
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504 Example:
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505 >>> wrap_in_fn_call("oldstr", (arg,))
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506 oldstr(arg)
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507
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diff changeset
508 >>> wrap_in_fn_call("olddiv", (arg1, arg2))
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509 olddiv(arg1, arg2)
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510
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511 >>> wrap_in_fn_call("olddiv", [arg1, comma, arg2, comma, arg3])
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512 olddiv(arg1, arg2, arg3)
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513 """
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514 assert len(args) > 0
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515 if len(args) == 2:
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516 expr1, expr2 = args
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517 newargs = [expr1, Comma(), expr2]
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518 else:
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519 newargs = args
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520 return Call(Name(fn_name), newargs, prefix=prefix)