u"""Fixer for 'raise E(V).with_traceback(T)' -> 'raise E, V, T'"""
from lib2to3 import fixer_base
from lib2to3.fixer_util import Comma, Node, Leaf, token, syms
class FixRaise(fixer_base.BaseFix):
PATTERN = u"""
raise_stmt< 'raise' (power< name=any [trailer< '(' val=any* ')' >]
[trailer< '.' 'with_traceback' > trailer< '(' trc=any ')' >] > | any) ['from' chain=any] >"""
def transform(self, node, results):
name, val, trc = (results.get(u"name"), results.get(u"val"), results.get(u"trc"))
chain = results.get(u"chain")
if chain is not None:
self.warning(node, u"explicit exception chaining is not supported in Python 2")
chain.prev_sibling.remove()
chain.remove()
if trc is not None:
val = val[0] if val else Leaf(token.NAME, u"None")
val.prefix = trc.prefix = u" "
kids = [Leaf(token.NAME, u"raise"), name.clone(), Comma(),
val.clone(), Comma(), trc.clone()]
raise_stmt = Node(syms.raise_stmt, kids)
node.replace(raise_stmt)
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