Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/libfuturize/fixes/fix_metaclass.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 # coding: utf-8
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2 """Fixer for __metaclass__ = X -> (future.utils.with_metaclass(X)) methods.
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3
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4 The various forms of classef (inherits nothing, inherits once, inherints
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5 many) don't parse the same in the CST so we look at ALL classes for
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6 a __metaclass__ and if we find one normalize the inherits to all be
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7 an arglist.
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8
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9 For one-liner classes ('class X: pass') there is no indent/dedent so
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10 we normalize those into having a suite.
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11
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12 Moving the __metaclass__ into the classdef can also cause the class
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13 body to be empty so there is some special casing for that as well.
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14
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15 This fixer also tries very hard to keep original indenting and spacing
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16 in all those corner cases.
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17 """
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18 # This is a derived work of Lib/lib2to3/fixes/fix_metaclass.py under the
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19 # copyright of the Python Software Foundation, licensed under the Python
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20 # Software Foundation License 2.
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21 #
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22 # Copyright notice:
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23 #
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24 # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
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25 # 2011, 2012, 2013 Python Software Foundation. All rights reserved.
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26 #
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27 # Full license text: http://docs.python.org/3.4/license.html
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28
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29 # Author: Jack Diederich, Daniel Neuhäuser
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30
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31 # Local imports
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32 from lib2to3 import fixer_base
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33 from lib2to3.pygram import token
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34 from lib2to3.fixer_util import Name, syms, Node, Leaf, touch_import, Call, \
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35 String, Comma, parenthesize
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36
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37
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38 def has_metaclass(parent):
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39 """ we have to check the cls_node without changing it.
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40 There are two possiblities:
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41 1) clsdef => suite => simple_stmt => expr_stmt => Leaf('__meta')
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42 2) clsdef => simple_stmt => expr_stmt => Leaf('__meta')
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43 """
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44 for node in parent.children:
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45 if node.type == syms.suite:
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46 return has_metaclass(node)
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47 elif node.type == syms.simple_stmt and node.children:
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48 expr_node = node.children[0]
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49 if expr_node.type == syms.expr_stmt and expr_node.children:
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50 left_side = expr_node.children[0]
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51 if isinstance(left_side, Leaf) and \
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52 left_side.value == '__metaclass__':
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53 return True
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54 return False
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55
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56
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57 def fixup_parse_tree(cls_node):
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58 """ one-line classes don't get a suite in the parse tree so we add
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59 one to normalize the tree
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60 """
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61 for node in cls_node.children:
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62 if node.type == syms.suite:
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63 # already in the preferred format, do nothing
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64 return
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65
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66 # !%@#! oneliners have no suite node, we have to fake one up
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67 for i, node in enumerate(cls_node.children):
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68 if node.type == token.COLON:
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69 break
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70 else:
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71 raise ValueError("No class suite and no ':'!")
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72
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73 # move everything into a suite node
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74 suite = Node(syms.suite, [])
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75 while cls_node.children[i+1:]:
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76 move_node = cls_node.children[i+1]
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77 suite.append_child(move_node.clone())
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78 move_node.remove()
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79 cls_node.append_child(suite)
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80 node = suite
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81
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82
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83 def fixup_simple_stmt(parent, i, stmt_node):
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84 """ if there is a semi-colon all the parts count as part of the same
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85 simple_stmt. We just want the __metaclass__ part so we move
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86 everything efter the semi-colon into its own simple_stmt node
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87 """
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88 for semi_ind, node in enumerate(stmt_node.children):
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89 if node.type == token.SEMI: # *sigh*
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90 break
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91 else:
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92 return
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93
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94 node.remove() # kill the semicolon
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95 new_expr = Node(syms.expr_stmt, [])
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96 new_stmt = Node(syms.simple_stmt, [new_expr])
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97 while stmt_node.children[semi_ind:]:
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98 move_node = stmt_node.children[semi_ind]
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99 new_expr.append_child(move_node.clone())
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100 move_node.remove()
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101 parent.insert_child(i, new_stmt)
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102 new_leaf1 = new_stmt.children[0].children[0]
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103 old_leaf1 = stmt_node.children[0].children[0]
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104 new_leaf1.prefix = old_leaf1.prefix
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105
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106
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107 def remove_trailing_newline(node):
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108 if node.children and node.children[-1].type == token.NEWLINE:
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109 node.children[-1].remove()
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110
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111
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112 def find_metas(cls_node):
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113 # find the suite node (Mmm, sweet nodes)
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114 for node in cls_node.children:
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115 if node.type == syms.suite:
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116 break
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117 else:
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118 raise ValueError("No class suite!")
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119
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120 # look for simple_stmt[ expr_stmt[ Leaf('__metaclass__') ] ]
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121 for i, simple_node in list(enumerate(node.children)):
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122 if simple_node.type == syms.simple_stmt and simple_node.children:
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123 expr_node = simple_node.children[0]
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124 if expr_node.type == syms.expr_stmt and expr_node.children:
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125 # Check if the expr_node is a simple assignment.
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126 left_node = expr_node.children[0]
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127 if isinstance(left_node, Leaf) and \
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128 left_node.value == u'__metaclass__':
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129 # We found a assignment to __metaclass__.
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130 fixup_simple_stmt(node, i, simple_node)
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131 remove_trailing_newline(simple_node)
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132 yield (node, i, simple_node)
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133
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134
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135 def fixup_indent(suite):
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136 """ If an INDENT is followed by a thing with a prefix then nuke the prefix
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137 Otherwise we get in trouble when removing __metaclass__ at suite start
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138 """
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139 kids = suite.children[::-1]
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140 # find the first indent
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141 while kids:
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142 node = kids.pop()
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143 if node.type == token.INDENT:
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144 break
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145
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146 # find the first Leaf
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147 while kids:
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148 node = kids.pop()
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149 if isinstance(node, Leaf) and node.type != token.DEDENT:
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150 if node.prefix:
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151 node.prefix = u''
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152 return
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153 else:
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154 kids.extend(node.children[::-1])
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155
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156
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157 class FixMetaclass(fixer_base.BaseFix):
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158 BM_compatible = True
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159
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160 PATTERN = """
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161 classdef<any*>
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162 """
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163
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164 def transform(self, node, results):
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165 if not has_metaclass(node):
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166 return
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167
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168 fixup_parse_tree(node)
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169
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170 # find metaclasses, keep the last one
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171 last_metaclass = None
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172 for suite, i, stmt in find_metas(node):
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173 last_metaclass = stmt
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174 stmt.remove()
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175
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176 text_type = node.children[0].type # always Leaf(nnn, 'class')
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177
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178 # figure out what kind of classdef we have
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179 if len(node.children) == 7:
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180 # Node(classdef, ['class', 'name', '(', arglist, ')', ':', suite])
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181 # 0 1 2 3 4 5 6
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182 if node.children[3].type == syms.arglist:
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183 arglist = node.children[3]
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184 # Node(classdef, ['class', 'name', '(', 'Parent', ')', ':', suite])
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185 else:
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186 parent = node.children[3].clone()
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187 arglist = Node(syms.arglist, [parent])
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188 node.set_child(3, arglist)
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189 elif len(node.children) == 6:
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190 # Node(classdef, ['class', 'name', '(', ')', ':', suite])
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191 # 0 1 2 3 4 5
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192 arglist = Node(syms.arglist, [])
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193 node.insert_child(3, arglist)
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194 elif len(node.children) == 4:
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195 # Node(classdef, ['class', 'name', ':', suite])
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196 # 0 1 2 3
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197 arglist = Node(syms.arglist, [])
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198 node.insert_child(2, Leaf(token.RPAR, u')'))
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199 node.insert_child(2, arglist)
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200 node.insert_child(2, Leaf(token.LPAR, u'('))
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201 else:
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202 raise ValueError("Unexpected class definition")
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203
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204 # now stick the metaclass in the arglist
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205 meta_txt = last_metaclass.children[0].children[0]
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206 meta_txt.value = 'metaclass'
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207 orig_meta_prefix = meta_txt.prefix
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208
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209 # Was: touch_import(None, u'future.utils', node)
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210 touch_import(u'future.utils', u'with_metaclass', node)
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211
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212 metaclass = last_metaclass.children[0].children[2].clone()
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213 metaclass.prefix = u''
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214
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215 arguments = [metaclass]
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216
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217 if arglist.children:
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218 if len(arglist.children) == 1:
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219 base = arglist.children[0].clone()
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220 base.prefix = u' '
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221 else:
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222 # Unfortunately six.with_metaclass() only allows one base
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223 # class, so we have to dynamically generate a base class if
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224 # there is more than one.
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225 bases = parenthesize(arglist.clone())
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226 bases.prefix = u' '
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227 base = Call(Name('type'), [
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228 String("'NewBase'"),
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229 Comma(),
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230 bases,
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231 Comma(),
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232 Node(
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233 syms.atom,
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234 [Leaf(token.LBRACE, u'{'), Leaf(token.RBRACE, u'}')],
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235 prefix=u' '
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236 )
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237 ], prefix=u' ')
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238 arguments.extend([Comma(), base])
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239
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240 arglist.replace(Call(
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241 Name(u'with_metaclass', prefix=arglist.prefix),
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242 arguments
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243 ))
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244
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245 fixup_indent(suite)
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246
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247 # check for empty suite
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248 if not suite.children:
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249 # one-liner that was just __metaclass_
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250 suite.remove()
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251 pass_leaf = Leaf(text_type, u'pass')
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252 pass_leaf.prefix = orig_meta_prefix
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253 node.append_child(pass_leaf)
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254 node.append_child(Leaf(token.NEWLINE, u'\n'))
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255
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256 elif len(suite.children) > 1 and \
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257 (suite.children[-2].type == token.INDENT and
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258 suite.children[-1].type == token.DEDENT):
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259 # there was only one line in the class body and it was __metaclass__
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260 pass_leaf = Leaf(text_type, u'pass')
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261 suite.insert_child(-1, pass_leaf)
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262 suite.insert_child(-1, Leaf(token.NEWLINE, u'\n'))