Torsten Rüger
c1679bd6ff
slots used to ba an array of symbols Now we have an object for each slot, that holds the name and the next_slot relatively easy change, though quite broad
51 lines
1.5 KiB
Ruby
51 lines
1.5 KiB
Ruby
module SlotMachine
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# A Slot defines a slot in a slotted. A bit like a variable name but for objects.
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#
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# PS: for the interested: A "development" of Smalltalk was the
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# prototype based language (read: JavaScript equivalent)
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# called Self https://en.wikipedia.org/wiki/Self_(programming_language)
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#
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# Slots are the instance names of objects. But since the language is dynamic
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# what is it that we can say about instance names at runtime?
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# Start with a Slotted, like the Message (in register one), we know all it's
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# variables. But there is a Message in there, and for that we know the instances
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# too. And off course for _all_ objects we know where the type is.
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#
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# The definiion is an array of symbols that we can resolve to SlotLoad
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# Instructions. Or in the case of constants to ConstantLoad
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#
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class Slot
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attr_reader :name , :next_slot
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# initialize with just the name of the slot. Add more to the chain with set_next
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def initialize( name )
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raise "No name" unless name
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@name = name
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end
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#set the next_slot , but always at the end of the chain
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def set_next(slot)
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if(@next_slot)
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@next_slot.set_next(slot)
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else
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@next_slot = slot
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end
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end
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# return the length of chain, ie 1 plus however many more next_slots there are
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def length
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return 1 unless @next_slot
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1 + @next_slot.length
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end
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# name of all the slots, with dot syntax
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def to_s
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names = name.to_s
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names += ".#{@next_slot}" if @next_slot
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names
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end
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end
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end
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