77 lines
1.9 KiB
Ruby
77 lines
1.9 KiB
Ruby
class Reline::History < Array
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def initialize(config)
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@config = config
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end
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def to_s
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'HISTORY'
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end
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def delete_at(index)
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index = check_index(index)
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super(index)
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end
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def [](index)
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index = check_index(index) unless index.is_a?(Range)
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super(index)
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end
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def []=(index, val)
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index = check_index(index)
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super(index, String.new(val, encoding: Reline.encoding_system_needs))
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end
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def concat(*val)
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val.each do |v|
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push(*v)
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end
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end
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def push(*val)
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# If history_size is zero, all histories are dropped.
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return self if @config.history_size.zero?
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# If history_size is negative, history size is unlimited.
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if @config.history_size.positive?
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diff = size + val.size - @config.history_size
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if diff > 0
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if diff <= size
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shift(diff)
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else
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diff -= size
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clear
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val.shift(diff)
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end
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end
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end
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super(*(val.map{ |v|
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String.new(v, encoding: Reline.encoding_system_needs)
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}))
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end
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def <<(val)
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# If history_size is zero, all histories are dropped.
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return self if @config.history_size.zero?
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# If history_size is negative, history size is unlimited.
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if @config.history_size.positive?
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shift if size + 1 > @config.history_size
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end
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super(String.new(val, encoding: Reline.encoding_system_needs))
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end
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private def check_index(index)
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index += size if index < 0
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if index < -2147483648 or 2147483647 < index
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raise RangeError.new("integer #{index} too big to convert to `int'")
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end
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# If history_size is negative, history size is unlimited.
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if @config.history_size.positive?
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if index < -@config.history_size or @config.history_size < index
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raise RangeError.new("index=<#{index}>")
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end
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end
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raise IndexError.new("index=<#{index}>") if index < 0 or size <= index
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index
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end
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end
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