Sha256: 3789a59fd267199949495268d3487900924e9456237d46d6b3087c1c90de5bb3
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Versions: 15
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Stored size: 1.26 KB
Contents
# frozen_string_literal: true
module Textbringer
class Ring
include Enumerable
def initialize(max = 30, on_delete: ->(x) {})
@max = max
@ring = []
@current = -1
@on_delete = on_delete
end
def clear
@ring.clear
@current = -1
end
def push(obj)
@current += 1
if @ring.size < @max
@ring.insert(@current, obj)
else
if @current == @max
@current = 0
end
@on_delete.call(@ring[@current])
@ring[@current] = obj
end
end
def pop
x = @ring[@current]
rotate(1)
x
end
def current
if @ring.empty?
raise EditorError, "Ring is empty"
end
@ring[@current]
end
def rotate(n)
@current = get_index(n)
@ring[@current]
end
def [](n = 0)
@ring[get_index(n)]
end
def empty?
@ring.empty?
end
def size
@ring.size
end
def each(&block)
@ring.each(&block)
end
def to_a
@ring.to_a
end
private
def get_index(n)
if @ring.empty?
raise EditorError, "Ring is empty"
end
i = @current - n
if 0 <= i && i < @ring.size
i
else
i % @ring.size
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems