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105 lines
2.7 KiB
Ruby
105 lines
2.7 KiB
Ruby
class Pry
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# A history array is an array to which you can only add elements. Older
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# entries are removed progressively, so that the aray never contains more than
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# N elements.
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#
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# History arrays are used by Pry to store the output of the last commands.
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#
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# @example
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# ary = Pry::HistoryArray.new 10
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# ary << 1 << 2 << 3
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# ary[0] # => 1
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# ary[1] # => 2
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# 10.times { |n| ary << n }
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# ary[0] # => nil
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# ary[-1] # => 9
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class HistoryArray
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include Enumerable
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# @param [Integer] size Maximum amount of objects in the array
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def initialize(size)
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@max_size = size
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@hash = {}
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@count = 0
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end
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# Pushes an object at the end of the array
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# @param [Object] value Object to be added
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def <<(value)
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@hash[@count] = value
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if @hash.size > max_size
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@hash.delete(@count - max_size)
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end
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@count += 1
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self
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end
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# @overload [](index)
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# @param [Integer] index Index of the item to access.
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# @return [Object, nil] Item at that index or nil if it has been removed.
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# @overload [](index, size)
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# @param [Integer] index Index of the first item to access.
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# @param [Integer] size Amount of items to access
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# @return [Array, nil] The selected items. Nil if index is greater than
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# the size of the array.
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# @overload [](range)
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# @param [Range<Integer>] range Range of indices to access.
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# @return [Array, nil] The selected items. Nil if index is greater than
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# the size of the array.
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def [](index_or_range, size = nil)
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if index_or_range.is_a? Integer
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index = convert_index(index_or_range)
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if size
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end_index = index + size
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index > @count ? nil : (index...[end_index, @count].min).map do |n|
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@hash[n]
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end
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else
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@hash[index]
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end
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else
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range = convert_range(index_or_range)
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range.begin > @count ? nil : range.map { |n| @hash[n] }
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end
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end
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# @return [Integer] Amount of objects in the array
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def size
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@count
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end
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def each
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((@count - size)...@count).each do |n|
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yield @hash[n]
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end
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end
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def to_a
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((@count - size)...@count).map { |n| @hash[n] }
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end
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def inspect
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"#<#{self.class} size=#{size} first=#{@count - size} max_size=#{max_size}>"
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end
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# @return [Integer] Maximum amount of objects in the array
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attr_reader :max_size
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private
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def convert_index(n)
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n >= 0 ? n : @count + n
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end
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def convert_range(range)
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end_index = convert_index(range.end)
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end_index += 1 unless range.exclude_end?
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Range.new(convert_index(range.begin), [end_index, @count].min, true)
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end
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end
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end
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