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