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Versions: 6790
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Contents
# frozen_string_literal: true
class Pry
class Command
class WatchExpression
class Expression
attr_reader :target, :source, :value, :previous_value, :pry_instance
def initialize(pry_instance, target, source)
@pry_instance = pry_instance
@target = target
@source = Code.new(source).strip
end
def eval!
@previous_value = value
@value = Pry::ColorPrinter.pp(target_eval(target, source), ''.dup)
end
def to_s
"#{Code.new(source).highlighted.strip} => #{value}"
end
# Has the value of the expression changed?
#
# We use the pretty-printed string represenation to detect differences
# as this avoids problems with dup (causes too many differences) and ==
# (causes too few)
def changed?
(value != previous_value)
end
private
def target_eval(target, source)
target.eval(source)
rescue StandardError => e
e
end
end
end
end
end
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