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require 'arel/visitors/visitor'
module Arel
module Visitors
class Reduce < Arel::Visitors::Visitor
def accept object, collector
visit object, collector
end
private
def visit object, collector
send dispatch[object.class], object, collector
rescue NoMethodError => e
raise e if respond_to?(dispatch[object.class], true)
superklass = object.class.ancestors.find { |klass|
respond_to?(dispatch[klass], true)
}
raise(TypeError, "Cannot visit #{object.class}") unless superklass
dispatch[object.class] = dispatch[superklass]
retry
end
end
end
end
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