156 lines
3.7 KiB
Ruby
156 lines
3.7 KiB
Ruby
# frozen_string_literal: false
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#
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# history.rb -
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# $Release Version: 0.9.6$
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# $Revision$
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# by Keiju ISHITSUKA(keiju@ruby-lang.org)
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#
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# --
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#
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#
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#
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module IRB # :nodoc:
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class Context
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NOPRINTING_IVARS.push "@eval_history_values"
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# See #set_last_value
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alias _set_last_value set_last_value
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def set_last_value(value)
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_set_last_value(value)
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if defined?(@eval_history) && @eval_history
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@eval_history_values.push @line_no, @last_value
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@workspace.evaluate self, "__ = IRB.CurrentContext.instance_eval{@eval_history_values}"
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end
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@last_value
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end
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remove_method :eval_history= if method_defined?(:eval_history=)
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# The command result history limit. This method is not available until
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# #eval_history= was called with non-nil value (directly or via
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# setting <code>IRB.conf[:EVAL_HISTORY]</code> in <code>.irbrc</code>).
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attr_reader :eval_history
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# Sets command result history limit. Default value is set from
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# <code>IRB.conf[:EVAL_HISTORY]</code>.
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#
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# +no+ is an Integer or +nil+.
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#
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# Returns +no+ of history items if greater than 0.
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#
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# If +no+ is 0, the number of history items is unlimited.
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#
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# If +no+ is +nil+, execution result history isn't used (default).
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#
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# History values are available via <code>__</code> variable, see
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# IRB::History.
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def eval_history=(no)
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if no
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if defined?(@eval_history) && @eval_history
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@eval_history_values.size(no)
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else
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@eval_history_values = History.new(no)
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IRB.conf[:__TMP__EHV__] = @eval_history_values
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@workspace.evaluate(self, "__ = IRB.conf[:__TMP__EHV__]")
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IRB.conf.delete(:__TMP_EHV__)
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end
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else
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@eval_history_values = nil
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end
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@eval_history = no
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end
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end
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# Represents history of results of previously evaluated commands.
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#
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# Available via <code>__</code> variable, only if <code>IRB.conf[:EVAL_HISTORY]</code>
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# or <code>IRB::CurrentContext().eval_history</code> is non-nil integer value
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# (by default it is +nil+).
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#
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# Example (in `irb`):
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#
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# # Initialize history
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# IRB::CurrentContext().eval_history = 10
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# # => 10
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#
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# # Perform some commands...
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# 1 + 2
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# # => 3
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# puts 'x'
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# # x
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# # => nil
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# raise RuntimeError
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# # ...error raised
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#
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# # Inspect history (format is "<item number> <evaluated value>":
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# __
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# # => 1 10
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# # 2 3
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# # 3 nil
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#
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# __[1]
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# # => 10
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#
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class History
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def initialize(size = 16) # :nodoc:
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@size = size
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@contents = []
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end
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def size(size) # :nodoc:
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if size != 0 && size < @size
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@contents = @contents[@size - size .. @size]
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end
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@size = size
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end
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# Get one item of the content (both positive and negative indexes work).
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def [](idx)
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begin
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if idx >= 0
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@contents.find{|no, val| no == idx}[1]
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else
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@contents[idx][1]
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end
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rescue NameError
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nil
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end
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end
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def push(no, val) # :nodoc:
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@contents.push [no, val]
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@contents.shift if @size != 0 && @contents.size > @size
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end
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alias real_inspect inspect
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def inspect # :nodoc:
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if @contents.empty?
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return real_inspect
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end
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unless (last = @contents.pop)[1].equal?(self)
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@contents.push last
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last = nil
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end
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str = @contents.collect{|no, val|
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if val.equal?(self)
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"#{no} ...self-history..."
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else
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"#{no} #{val.inspect}"
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end
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}.join("\n")
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if str == ""
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str = "Empty."
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end
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@contents.push last if last
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str
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end
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end
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end
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