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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] > ')' > | |
| > | |
| | | |
| 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)) | |