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SickRage/lib/hachoir_core/field/enum.py

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def Enum(field, enum, key_func=None):
"""
Enum is an adapter to another field: it will just change its display
attribute. It uses a dictionnary to associate a value to another.
key_func is an optional function with prototype "def func(key)->key"
which is called to transform key.
"""
display = field.createDisplay
if key_func:
def createDisplay():
try:
key = key_func(field.value)
return enum[key]
except LookupError:
return display()
else:
def createDisplay():
try:
return enum[field.value]
except LookupError:
return display()
field.createDisplay = createDisplay
field.getEnum = lambda: enum
return field