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Code related to "flattening" events; that is, extracting a description of all
relevant fields from the format string and persisting them for later
examination.
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A L{KeyFlattener} computes keys for the things within curly braces in
PEP-3101-style format strings as parsed by L{string.Formatter.parse}.
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Initialize a L{KeyFlattener}.
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Compute a string key for a given field/format/conversion.
@param fieldName: A format field name.
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@param conversion: A format field conversion type.
@return: A key specific to the given field, format and conversion, as
well as the occurrence of that combination within this
L{KeyFlattener}'s lifetime.
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Flatten the given event by pre-associating format fields with specific
objects and callable results in a L{dict} put into the C{"log_flattened"}
key in the event.
@param event: A logging event.
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Extract a given format field from the given event.
@param field: A string describing a format field or log key. This is the
text that would normally fall between a pair of curly braces in a
format string: for example, C{"key[2].attribute"}. If a conversion is
specified (the thing after the C{"!"} character in a format field) then
the result will always be str.
@param event: A log event.
@return: A value extracted from the field.
@raise KeyError: if the field is not found in the given event.
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Format an event which has been flattened with L{flattenEvent}.
@param event: A logging event.
@return: A formatted string.
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