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annotate env/lib/python3.7/site-packages/libpasteurize/fixes/fix_metaclass.py @ 3:758bc20232e8 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -0400
parents 26e78fe6e8c4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 u"""
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2 Fixer for (metaclass=X) -> __metaclass__ = X
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3 Some semantics (see PEP 3115) may be altered in the translation."""
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4
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5 from lib2to3 import fixer_base
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6 from lib2to3.fixer_util import Name, syms, Node, Leaf, Newline, find_root
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7 from lib2to3.pygram import token
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8 from libfuturize.fixer_util import indentation, suitify
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9 # from ..fixer_util import Name, syms, Node, Leaf, Newline, find_root, indentation, suitify
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10
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11 def has_metaclass(parent):
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12 results = None
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13 for node in parent.children:
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14 kids = node.children
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15 if node.type == syms.argument:
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16 if kids[0] == Leaf(token.NAME, u"metaclass") and \
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17 kids[1] == Leaf(token.EQUAL, u"=") and \
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18 kids[2]:
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19 #Hack to avoid "class X(=):" with this case.
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20 results = [node] + kids
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21 break
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22 elif node.type == syms.arglist:
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23 # Argument list... loop through it looking for:
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24 # Node(*, [*, Leaf(token.NAME, u"metaclass"), Leaf(token.EQUAL, u"="), Leaf(*, *)]
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25 for child in node.children:
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26 if results: break
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27 if child.type == token.COMMA:
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28 #Store the last comma, which precedes the metaclass
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29 comma = child
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30 elif type(child) == Node:
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31 meta = equal = name = None
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32 for arg in child.children:
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33 if arg == Leaf(token.NAME, u"metaclass"):
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34 #We have the (metaclass) part
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35 meta = arg
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36 elif meta and arg == Leaf(token.EQUAL, u"="):
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37 #We have the (metaclass=) part
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38 equal = arg
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39 elif meta and equal:
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40 #Here we go, we have (metaclass=X)
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41 name = arg
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42 results = (comma, meta, equal, name)
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43 break
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44 return results
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45
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46
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47 class FixMetaclass(fixer_base.BaseFix):
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48
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49 PATTERN = u"""
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50 classdef<any*>
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51 """
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52
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53 def transform(self, node, results):
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54 meta_results = has_metaclass(node)
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55 if not meta_results: return
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56 for meta in meta_results:
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57 meta.remove()
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58 target = Leaf(token.NAME, u"__metaclass__")
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59 equal = Leaf(token.EQUAL, u"=", prefix=u" ")
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60 # meta is the last item in what was returned by has_metaclass(): name
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61 name = meta
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62 name.prefix = u" "
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63 stmt_node = Node(syms.atom, [target, equal, name])
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64
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65 suitify(node)
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66 for item in node.children:
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67 if item.type == syms.suite:
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68 for stmt in item.children:
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69 if stmt.type == token.INDENT:
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70 # Insert, in reverse order, the statement, a newline,
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71 # and an indent right after the first indented line
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72 loc = item.children.index(stmt) + 1
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73 # Keep consistent indentation form
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74 ident = Leaf(token.INDENT, stmt.value)
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75 item.insert_child(loc, ident)
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76 item.insert_child(loc, Newline())
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77 item.insert_child(loc, stmt_node)
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78 break