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import oe.maketype
import bb.msg
def typed_value(key, d):
"""Construct a value for the specified metadata variable, using its flags
to determine the type and parameters for construction."""
var_type = d.getVarFlag(key, 'type')
flags = d.getVarFlags(key)
if flags is not None:
flags = dict((flag, bb.data.expand(value, d))
for flag, value in flags.iteritems())
else:
flags = {}
try:
return oe.maketype.create(d.getVar(key, True) or '', var_type, **flags)
except (TypeError, ValueError), exc:
bb.msg.fatal("Data", "%s: %s" % (key, str(exc)))
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