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