Smalltalk Programming/Overview

removeEventsTriggeredFor: anObject inState: aState
        "Remove all the events triggered by the receiver which would have
        been sent to anObject in the given state."

        | events |
        events := transitions at: aState ifAbsent: [ ^self ].
        events copy keysAndValuesDo:
                [:evtSym :msgSendSet |
                | newSet |
                newSet := msgSendSet reject: [:each | each receiver == anObject
                        and: [ (anObject == self and: [ each selector == #newState: ]) not ] ].
                msgSendSet size = newSet size ifFalse:
                        [newSet isEmpty
                                ifTrue: [ events removeKey: evtSym]
                                ifFalse: [ events at: evtSym put: newSet]]].

Claim: Lots of indentions is a sign that code needs to be refactored. CPS