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