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54 lines
1.7 KiB
Python
54 lines
1.7 KiB
Python
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"""
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Optional fixer to transform set() calls to set literals.
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"""
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# Author: Benjamin Peterson
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from lib2to3 import fixer_base, pytree
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from lib2to3.fixer_util import token, syms
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class FixSetLiteral(fixer_base.BaseFix):
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BM_compatible = True
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explicit = True
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PATTERN = """power< 'set' trailer< '('
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(atom=atom< '[' (items=listmaker< any ((',' any)* [',']) >
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single=any) ']' >
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atom< '(' items=testlist_gexp< any ((',' any)* [',']) > ')' >
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)
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')' > >
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"""
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def transform(self, node, results):
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single = results.get("single")
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if single:
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# Make a fake listmaker
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fake = pytree.Node(syms.listmaker, [single.clone()])
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single.replace(fake)
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items = fake
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else:
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items = results["items"]
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# Build the contents of the literal
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literal = [pytree.Leaf(token.LBRACE, u"{")]
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literal.extend(n.clone() for n in items.children)
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literal.append(pytree.Leaf(token.RBRACE, u"}"))
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# Set the prefix of the right brace to that of the ')' or ']'
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literal[-1].prefix = items.next_sibling.prefix
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maker = pytree.Node(syms.dictsetmaker, literal)
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maker.prefix = node.prefix
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# If the original was a one tuple, we need to remove the extra comma.
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if len(maker.children) == 4:
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n = maker.children[2]
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n.remove()
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maker.children[-1].prefix = n.prefix
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# Finally, replace the set call with our shiny new literal.
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return maker
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