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# frozen_string_literal: true
#
# history.rb -
# 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 "__ = 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).
#
# EvalHistory values are available via <code>__</code> variable, see
# IRB::EvalHistory.
def eval_history=(no)
if no
if defined?(@eval_history) && @eval_history
@eval_history_values.size(no)
else
@eval_history_values = EvalHistory.new(no)
IRB.conf[:__TMP__EHV__] = @eval_history_values
workspace.evaluate("__ = 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 EvalHistory
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
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