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history.rb
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# frozen_string_literal: false # # history.rb - # $Release Version: 0.9.6$ # $Revision$ # 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 defined?(@eval_history) && @eval_history @eval_history_values.push @line_no, @last_value @workspace.evaluate self, "__ = IRB.CurrentContext.instance_eval{@eval_history_values}" end @last_value end remove_method :eval_history= if method_defined?(:eval_history=) # The command result history limit. This method is not available until # #eval_history= was called with non-nil value (directly or via # setting <code>IRB.conf[:EVAL_HISTORY]</code> in <code>.irbrc</code>). attr_reader :eval_history # Sets command result history limit. Default value is set from # <code>IRB.conf[:EVAL_HISTORY]</code>. # # +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). # # History values are available via <code>__</code> variable, see # IRB::History. 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 # Represents history of results of previously evaluated commands. # # Available via <code>__</code> variable, only if <code>IRB.conf[:EVAL_HISTORY]</code> # or <code>IRB::CurrentContext().eval_history</code> is non-nil integer value # (by default it is +nil+). # # Example (in `irb`): # # # Initialize history # IRB::CurrentContext().eval_history = 10 # # => 10 # # # Perform some commands... # 1 + 2 # # => 3 # puts 'x' # # x # # => nil # raise RuntimeError # # ...error raised # # # Inspect history (format is "<item number> <evaluated value>": # __ # # => 1 10 # # 2 3 # # 3 nil # # __[1] # # => 10 # class History def initialize(size = 16) # :nodoc: @size = size @contents = [] end def size(size) # :nodoc: if size != 0 && size < @size @contents = @contents[@size - size .. @size] end @size = size end # Get one item of the content (both positive and negative indexes work). 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) # :nodoc: @contents.push [no, val] @contents.shift if @size != 0 && @contents.size > @size end alias real_inspect inspect def inspect # :nodoc: 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