"""Fixer for sys.exc_{type, value, traceback}
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sys.exc_type -> sys.exc_info()[0]
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sys.exc_value -> sys.exc_info()[1]
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sys.exc_traceback -> sys.exc_info()[2]
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"""
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# By Jeff Balogh and Benjamin Peterson
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# Local imports
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from .. import fixer_base
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from ..fixer_util import Attr, Call, Name, Number, Subscript, Node, syms
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class FixSysExc(fixer_base.BaseFix):
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# This order matches the ordering of sys.exc_info().
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exc_info = [u"exc_type", u"exc_value", u"exc_traceback"]
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BM_compatible = True
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PATTERN = """
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power< 'sys' trailer< dot='.' attribute=(%s) > >
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""" % '|'.join("'%s'" % e for e in exc_info)
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def transform(self, node, results):
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sys_attr = results["attribute"][0]
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index = Number(self.exc_info.index(sys_attr.value))
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call = Call(Name(u"exc_info"), prefix=sys_attr.prefix)
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attr = Attr(Name(u"sys"), call)
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attr[1].children[0].prefix = results["dot"].prefix
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attr.append(Subscript(index))
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return Node(syms.power, attr, prefix=node.prefix)
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