| 1 | n/a | """ |
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| 2 | n/a | Optional fixer to transform set() calls to set literals. |
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| 3 | n/a | """ |
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| 4 | n/a | |
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| 5 | n/a | # Author: Benjamin Peterson |
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| 6 | n/a | |
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| 7 | n/a | from lib2to3 import fixer_base, pytree |
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| 8 | n/a | from lib2to3.fixer_util import token, syms |
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| 9 | n/a | |
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| 10 | n/a | |
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| 11 | n/a | |
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| 12 | n/a | class FixSetLiteral(fixer_base.BaseFix): |
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| 13 | n/a | |
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| 14 | n/a | BM_compatible = True |
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| 15 | n/a | explicit = True |
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| 16 | n/a | |
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| 17 | n/a | PATTERN = """power< 'set' trailer< '(' |
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| 18 | n/a | (atom=atom< '[' (items=listmaker< any ((',' any)* [',']) > |
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| 19 | n/a | | |
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| 20 | n/a | single=any) ']' > |
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| 21 | n/a | | |
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| 22 | n/a | atom< '(' items=testlist_gexp< any ((',' any)* [',']) > ')' > |
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| 23 | n/a | ) |
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| 24 | n/a | ')' > > |
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| 25 | n/a | """ |
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| 26 | n/a | |
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| 27 | n/a | def transform(self, node, results): |
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| 28 | n/a | single = results.get("single") |
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| 29 | n/a | if single: |
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| 30 | n/a | # Make a fake listmaker |
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| 31 | n/a | fake = pytree.Node(syms.listmaker, [single.clone()]) |
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| 32 | n/a | single.replace(fake) |
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| 33 | n/a | items = fake |
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| 34 | n/a | else: |
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| 35 | n/a | items = results["items"] |
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| 36 | n/a | |
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| 37 | n/a | # Build the contents of the literal |
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| 38 | n/a | literal = [pytree.Leaf(token.LBRACE, "{")] |
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| 39 | n/a | literal.extend(n.clone() for n in items.children) |
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| 40 | n/a | literal.append(pytree.Leaf(token.RBRACE, "}")) |
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| 41 | n/a | # Set the prefix of the right brace to that of the ')' or ']' |
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| 42 | n/a | literal[-1].prefix = items.next_sibling.prefix |
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| 43 | n/a | maker = pytree.Node(syms.dictsetmaker, literal) |
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| 44 | n/a | maker.prefix = node.prefix |
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| 45 | n/a | |
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| 46 | n/a | # If the original was a one tuple, we need to remove the extra comma. |
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| 47 | n/a | if len(maker.children) == 4: |
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| 48 | n/a | n = maker.children[2] |
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| 49 | n/a | n.remove() |
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| 50 | n/a | maker.children[-1].prefix = n.prefix |
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| 51 | n/a | |
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| 52 | n/a | # Finally, replace the set call with our shiny new literal. |
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| 53 | n/a | return maker |
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