0
  "   ˆl–Ãa¾”d*j"TÚzã@¸Ø”Å£ÂƒkÁÀ 
    """Fixer for sys.exc_{type, value, traceback}

sys.exc_type -> sys.exc_info()[0]
sys.exc_value -> sys.exc_info()[1]
sys.exc_traceback -> sys.exc_info()[2]
"""

# By Jeff Balogh and Benjamin Peterson

# Local imports
from .. import fixer_base
from ..fixer_util import Attr, Call, Name, Number, Subscript, Node, syms

class FixSysExc(fixer_base.BaseFix):
    # This order matches the ordering of sys.exc_info().
    exc_info = ["exc_type", "exc_value", "exc_traceback"]
    BM_compatible = True
    PATTERN = """
              power< 'sys' trailer< dot='.' attribute=(%s) > >
              """ % '|'.join("'%s'" % e for e in exc_info)

    def transform(self, node, results):
        sys_attr = results["attribute"][0]
        index = Number(self.exc_info.index(sys_attr.value))

        call = Call(Name("exc_info"), prefix=sys_attr.prefix)
        attr = Attr(Name("sys"), call)
        attr[1].children[0].prefix = results["dot"].prefix
        attr.append(Subscript(index))
        return Node(syms.power, attr, prefix=node.prefix)
  "   ˆl–äY>”Šn-jq@¿q—îµ1hßÃƒh¹ÂÁ      N
     	ˆ¿ÃƒâsÂÁ n    	"""Fixer for 'raise E, V, T'

raise         -> raise
raise E       -> raise E
raise E, V    -> raise E(V)
raise E, V, T -> raise E(V).with_traceback(T)
raise E, None, T -> raise E.with_traceback(T)

raise (((E, E'), E''), E'''), V -> raise E(V)
raise "foo", V, T               -> warns about string exceptions


CAVEATS:
1) "raise E, V" will be incorrectly translated if V is an exception
   instance. The correct Python 3 idiom is

        raise E from V

   but since we can't detect instance-hood by syntax alone and since
   any client code would have to be changed as well, we don't automate
   this.
"""
# Author: Collin Winter

# Local imports
from .. import pytree
from ..pgen2 import token
from .. import fixer_base
from ..fixer_util import Name, Call, Attr, ArgList, is_tuple

class FixRaise(fixer_base.BaseFix):

    BM_compatible = True
    PATTERN = """
    raise_stmt< 'raise' exc=any [',' val=any [',' tb=any]] >
    """

    def transform(self, node, results):
        syms = self.syms

        exc = results["exc"].clone()
        if exc.type == token.STRING:
            msg = "Python 3 does not support string exceptions"
            self.cannot_convert(node, msg)
            return

        # Python 2 supports
        #  raise ((((E1, E2), E3), E4), E5), V
        # as a synonym for
        #  raise E1, V
        # Since Python 3 will not support this, we recurse down any tuple
        # literals, always taking the first element.
        if is_tuple(exc):
            while is_tuple(exc):
                # exc.children[1:-1] is the unparenthesized tuple
                # exc.children[1].children[0] is the first element of the tuple
                exc = exc.children[1].children[0].clone()
            exc.prefix = " "

        if "val" not in results:
            # One-argument raise
            new = pytree.Node(syms.raise_stmt, [Name("raise"), exc])
            new.prefix = node.prefix
            return new

        val = results["val"].clone()
        if is_tuple(val):
            args = [c.clone() for c in val.children[1:-1]]
        else:
            val.prefix = ""
            args = [val]

        if "tb" in results:
            tb = results["tb"].clone()
            tb.prefix = ""

            e = exc
            # If there's a traceback and None is passed as the value, then don't
            # add a call, since the user probably just wants to add a
            # traceback. See issue #9661.
            if val.type != token.NAME or val.value != "None":
                e = Call(exc, args)
            with_tb = Attr(e, Name('with_traceback')) + [ArgList([tb])]
            new = pytree.Node(syms.simple_stmt, [Name("raise")] + with_tb)
            new.prefix = node.prefix
            return new
        else:
            return pytree.Node(syms.raise_stmt,
                               [Name("raise"), Call(exc, args)],
                               prefix=node.prefix)