58 lines
1.3 KiB
Ruby
58 lines
1.3 KiB
Ruby
# frozen_string_literal: true
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module Arel
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module Nodes
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class Case < Arel::Nodes::Node
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include Arel::OrderPredications
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include Arel::Predications
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include Arel::AliasPredication
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attr_accessor :case, :conditions, :default
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def initialize expression = nil, default = nil
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@case = expression
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@conditions = []
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@default = default
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end
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def when condition, expression = nil
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@conditions << When.new(Nodes.build_quoted(condition), expression)
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self
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end
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def then expression
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@conditions.last.right = Nodes.build_quoted(expression)
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self
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end
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def else expression
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@default = Else.new Nodes.build_quoted(expression)
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self
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end
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def initialize_copy other
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super
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@case = @case.clone if @case
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@conditions = @conditions.map { |x| x.clone }
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@default = @default.clone if @default
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end
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def hash
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[@case, @conditions, @default].hash
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end
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def eql? other
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self.class == other.class &&
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self.case == other.case &&
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self.conditions == other.conditions &&
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self.default == other.default
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end
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alias :== :eql?
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end
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class When < Binary # :nodoc:
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end
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class Else < Unary # :nodoc:
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end
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end
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end
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