| 1 | n/a | """Fixer for generator.throw(E, V, T). |
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| 2 | n/a | |
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| 3 | n/a | g.throw(E) -> g.throw(E) |
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| 4 | n/a | g.throw(E, V) -> g.throw(E(V)) |
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| 5 | n/a | g.throw(E, V, T) -> g.throw(E(V).with_traceback(T)) |
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| 6 | n/a | |
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| 7 | n/a | g.throw("foo"[, V[, T]]) will warn about string exceptions.""" |
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| 8 | n/a | # Author: Collin Winter |
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| 9 | n/a | |
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| 10 | n/a | # Local imports |
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| 11 | n/a | from .. import pytree |
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| 12 | n/a | from ..pgen2 import token |
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| 13 | n/a | from .. import fixer_base |
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| 14 | n/a | from ..fixer_util import Name, Call, ArgList, Attr, is_tuple |
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| 15 | n/a | |
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| 16 | n/a | class FixThrow(fixer_base.BaseFix): |
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| 17 | n/a | BM_compatible = True |
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| 18 | n/a | PATTERN = """ |
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| 19 | n/a | power< any trailer< '.' 'throw' > |
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| 20 | n/a | trailer< '(' args=arglist< exc=any ',' val=any [',' tb=any] > ')' > |
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| 21 | n/a | > |
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| 22 | n/a | | |
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| 23 | n/a | power< any trailer< '.' 'throw' > trailer< '(' exc=any ')' > > |
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| 24 | n/a | """ |
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| 25 | n/a | |
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| 26 | n/a | def transform(self, node, results): |
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| 27 | n/a | syms = self.syms |
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| 28 | n/a | |
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| 29 | n/a | exc = results["exc"].clone() |
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| 30 | n/a | if exc.type is token.STRING: |
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| 31 | n/a | self.cannot_convert(node, "Python 3 does not support string exceptions") |
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| 32 | n/a | return |
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| 33 | n/a | |
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| 34 | n/a | # Leave "g.throw(E)" alone |
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| 35 | n/a | val = results.get("val") |
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| 36 | n/a | if val is None: |
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| 37 | n/a | return |
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| 38 | n/a | |
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| 39 | n/a | val = val.clone() |
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| 40 | n/a | if is_tuple(val): |
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| 41 | n/a | args = [c.clone() for c in val.children[1:-1]] |
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| 42 | n/a | else: |
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| 43 | n/a | val.prefix = "" |
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| 44 | n/a | args = [val] |
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| 45 | n/a | |
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| 46 | n/a | throw_args = results["args"] |
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| 47 | n/a | |
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| 48 | n/a | if "tb" in results: |
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| 49 | n/a | tb = results["tb"].clone() |
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| 50 | n/a | tb.prefix = "" |
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| 51 | n/a | |
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| 52 | n/a | e = Call(exc, args) |
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| 53 | n/a | with_tb = Attr(e, Name('with_traceback')) + [ArgList([tb])] |
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| 54 | n/a | throw_args.replace(pytree.Node(syms.power, with_tb)) |
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| 55 | n/a | else: |
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| 56 | n/a | throw_args.replace(Call(exc, args)) |
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