LookupFlag is a shortcut to build up a FlagLookup structure.

ErrNoFile is an returned by Lookup implementation to report that lookup didn't find any file to parse.

FlagLookup search for flag with equal name and interprets it as filename to open.

Parser contains options of parsing source and filling flag values.

Lookup is an interface to search for syntax source.

Syntax is an interface capable to parse file syntax.

BytesLookup succeeds source lookup with itself.

LookupFunc is an adapter that allows the use of ordinar functions as Lookup.

MultiLookup holds Lookup implementations and their order.

PathLookup prepares source search on a path.