57 lines
1.5 KiB
Python
57 lines
1.5 KiB
Python
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"""Fixer for generator.throw(E, V, T).
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g.throw(E) -> g.throw(E)
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g.throw(E, V) -> g.throw(E(V))
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g.throw(E, V, T) -> g.throw(E(V).with_traceback(T))
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g.throw("foo"[, V[, T]]) will warn about string exceptions."""
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# Author: Collin Winter
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# Local imports
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from .. import pytree
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from ..pgen2 import token
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from .. import fixer_base
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from ..fixer_util import Name, Call, ArgList, Attr, is_tuple
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class FixThrow(fixer_base.BaseFix):
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BM_compatible = True
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PATTERN = """
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power< any trailer< '.' 'throw' >
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trailer< '(' args=arglist< exc=any ',' val=any [',' tb=any] > ')' >
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>
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power< any trailer< '.' 'throw' > trailer< '(' exc=any ')' > >
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"""
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def transform(self, node, results):
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syms = self.syms
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exc = results["exc"].clone()
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if exc.type is token.STRING:
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self.cannot_convert(node, "Python 3 does not support string exceptions")
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return
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# Leave "g.throw(E)" alone
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val = results.get("val")
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if val is None:
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return
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val = val.clone()
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if is_tuple(val):
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args = [c.clone() for c in val.children[1:-1]]
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else:
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val.prefix = ""
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args = [val]
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throw_args = results["args"]
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if "tb" in results:
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tb = results["tb"].clone()
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tb.prefix = ""
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e = Call(exc, args)
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with_tb = Attr(e, Name('with_traceback')) + [ArgList([tb])]
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throw_args.replace(pytree.Node(syms.power, with_tb))
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else:
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throw_args.replace(Call(exc, args))
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