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@@ -0,0 +1,24 @@
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+# frozen_string_literal: true
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+
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+module ActivityPub::CaseTransform
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+ class << self
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+ def camel_lower_cache
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+ @camel_lower_cache ||= {}
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+ end
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+
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+ def camel_lower(value)
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+ case value
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+ when Array then value.map { |item| camel_lower(item) }
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+ when Hash then value.deep_transform_keys! { |key| camel_lower(key) }
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+ when Symbol then camel_lower(value.to_s).to_sym
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+ when String
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+ camel_lower_cache[value] ||= if value.start_with?('_:')
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+ '_:' + value.gsub(/\A_:/, '').underscore.camelize(:lower)
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+ else
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+ value.underscore.camelize(:lower)
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+ end
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+ else value
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+ end
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+ end
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+ end
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+end
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