Compile compiles an input format string into a StringFormatter.

CompileEvent compiles an event format string into an runnable EventFormatString.

MustCompileEvent copmiles an event format string into an runnable EventFormatString.

EventFormatString implements format string support on events of type beat.Event.

StringElement implements StringFormatter always returning a constant string.

VariableOp defines one expansion variable, including operator and parameter.

FormatEvaler evaluates some format.

StringFormatter interface extends FormatEvaler adding support for querying formatter meta data.

VariableCompiler is used to compile a variable expansion into an FormatEvaler to be used with the format-string.