Compile is used to compile expressions.

ParseBytes creates an Iterator instance from byte array.

SignalArray identifies the beginning of the array.

SignalInvalid identifies unrecognized signals.

SignalName identifies the beginning of the function name and key name.

SignalObject identifies the beginning of the object.

SignalPipeline identifies the beginning of the pipeline.

Iterator is a io.Reader like object, with specific read functions.

SignalType is the signal value type.