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30990006a9
This reduces chances of errors where consumers of strings mutate inputs and reduces memory usage of the app. Test suite passes now, but there may be some stuff left, so we will run a few sites on a branch prior to merging
58 lines
1.4 KiB
Ruby
58 lines
1.4 KiB
Ruby
# frozen_string_literal: true
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class Enum < Hash
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# Public: Initialize an enum.
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#
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# members - Array of enum members or Hash of enum members.
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# Array of enum members may also contain a hash of options:
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# :start - the number of first enum member. Defaults to 1.
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#
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# Examples
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#
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# FRUITS = Enum.new(:apple, :orange, :kiwi) # array
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# FRUITS = Enum.new(:apple, :orange, :kiwi, start: 0) # array
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# FRUITS = Enum.new(apple: 1, orange: 2, kiwi: 3) # hash
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def initialize(*members)
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super({})
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if members[0].is_a?(Hash)
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# hash
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update Hash[members[0]]
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else
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# array
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options = members.extract_options!
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start = options.fetch(:start) { 1 }
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update Hash[members.zip(start..members.count + start)]
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end
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end
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# Public: Access the number/value of member.
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#
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# ids_or_value - number or value of member.
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#
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# Returns value if number was provided, and number if value was provided.
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def [](id_or_value)
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fetch(id_or_value) { key(id_or_value) }
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end
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# Public: Check if supplied member is valid.
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def valid?(member)
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has_key?(member)
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end
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# Public: Create a subset of enum, only include specified keys.
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def only(*keys)
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dup.tap do |d|
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d.keep_if { |k| keys.include?(k) }
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end
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end
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# Public: Create a subset of enum, preserve all items but specified ones.
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def except(*keys)
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dup.tap do |d|
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d.delete_if { |k| keys.include?(k) }
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end
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end
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end
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