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29 lines
433 B
CoffeeScript
29 lines
433 B
CoffeeScript
class AsciiIo.TabStops
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constructor: (@cols) ->
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@stops = (x for x in [0...@cols] when x % 8 is 0)
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add: (col) ->
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unless _(@stops).include(col)
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pos = _(@stops).sortedIndex(col)
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@stops.splice(pos, 0, col)
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next: (cursorX) ->
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for x in @stops
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if x > cursorX
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return x
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@cols
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prev: (cursorX) ->
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ret = 0
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for x in @stops
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if x > cursorX
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break
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ret = x
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ret
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