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https://github.com/inspec/inspec
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48 lines
1.3 KiB
Ruby
48 lines
1.3 KiB
Ruby
# author: Dominik Richter
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# author: Christoph Hartmann
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module ObjectTraverser
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def extract_value(keys, value)
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return nil if value.nil?
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key = keys.shift
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return nil if key.nil?
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# if the current value is not a Hash or Array, it is undefined
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# behavior so value will be assigned nil by default.
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value = if value.is_a?(Array)
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extract_from_array(key, value)
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elsif value.is_a?(Hash)
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extract_from_hash(key, value)
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end
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# if there are no more keys, just return the value
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return value if keys.first.nil?
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# if there are more keys, extract more
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extract_value(keys.clone, value)
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end
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private
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# If the values to return from is an Array, allow returning by index.
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# Otherwise, support methods on the Array itself.
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def extract_from_array(key, value)
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if key.is_a?(Integer)
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value[key]
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elsif value.respond_to?(key.to_sym)
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value.send(key.to_sym)
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end
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end
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# for Hashes, try to return the value by the key.
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# We first try to find by the raw key before we stringify
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# if the keys themselves are symbols, for example.
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#
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# This will return nil default if we can't find the key.
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def extract_from_hash(key, value)
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if value.key?(key)
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value[key]
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elsif value.key?(key.to_s)
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value[key.to_s]
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end
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end
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end
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