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opt/alt/ruby23/lib64/ruby/2.3.0/irb/ext/_[ Not.Writable ]

File://opt/alt/ruby23/lib64/ruby/2.3.0/irb/ext/history.rb

# frozen_string_literal: false
#
#   history.rb -
#   	$Release Version: 0.9.6$
#   	$Revision: 53141 $
#   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#

module IRB # :nodoc:

  class Context

    NOPRINTING_IVARS.push "@eval_history_values"

    # See #set_last_value
    alias _set_last_value set_last_value

    def set_last_value(value)
      _set_last_value(value)

      if @eval_history
        @eval_history_values.push @line_no, @last_value
        @workspace.evaluate self, "__ = IRB.CurrentContext.instance_eval{@eval_history_values}"
      end

      @last_value
    end

    # The command result history limit.
    attr_reader :eval_history
    # Sets command result history limit.
    #
    # +no+ is an Integer or +nil+.
    #
    # Returns +no+ of history items if greater than 0.
    #
    # If +no+ is 0, the number of history items is unlimited.
    #
    # If +no+ is +nil+, execution result history isn't used (default).
    def eval_history=(no)
      if no
        if defined?(@eval_history) && @eval_history
          @eval_history_values.size(no)
        else
          @eval_history_values = History.new(no)
          IRB.conf[:__TMP__EHV__] = @eval_history_values
          @workspace.evaluate(self, "__ = IRB.conf[:__TMP__EHV__]")
          IRB.conf.delete(:__TMP_EHV__)
        end
      else
        @eval_history_values = nil
      end
      @eval_history = no
    end
  end

  class History # :nodoc:

    def initialize(size = 16)
      @size = size
      @contents = []
    end

    def size(size)
      if size != 0 && size < @size
        @contents = @contents[@size - size .. @size]
      end
      @size = size
    end

    def [](idx)
      begin
        if idx >= 0
          @contents.find{|no, val| no == idx}[1]
        else
          @contents[idx][1]
        end
      rescue NameError
        nil
      end
    end

    def push(no, val)
      @contents.push [no, val]
      @contents.shift if @size != 0 && @contents.size > @size
    end

    alias real_inspect inspect

    def inspect
      if @contents.empty?
        return real_inspect
      end

      unless (last = @contents.pop)[1].equal?(self)
        @contents.push last
        last = nil
      end
      str = @contents.collect{|no, val|
        if val.equal?(self)
          "#{no} ...self-history..."
        else
          "#{no} #{val.inspect}"
        end
      }.join("\n")
      if str == ""
        str = "Empty."
      end
      @contents.push last if last
      str
    end
  end
end

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