Module: SnakyHash::Snake::SnakyModulizer

Defined in:
lib/snaky_hash/snake.rb

Class Method Summary collapse

Class Method Details

.to_mod(key_type) ⇒ Object 



19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
 
# File 'lib/snaky_hash/snake.rb', line 19

def self.to_mod(key_type)
  Module.new do
    # Converts a key to a symbol, or a string, depending on key_type,
    #   but only if it is able to be converted to a symbol,
    #   and after underscoring it.
    #
    # @api private
    # @param [<K>] key the key to attempt convert to a symbol
    # @return [Symbol, K]

    case key_type
    when :string then
      define_method(:convert_key) { |key| key.respond_to?(:to_sym) ? underscore_string(key.to_s) : key }
    when :symbol then
      define_method(:convert_key) { |key| key.respond_to?(:to_sym) ? underscore_string(key.to_s).to_sym : key }
    else
      raise ArgumentError, "SnakyHash: Unhandled key_type: #{key_type}"
    end

    # Unlike its parent Mash, a SnakyHash::Snake will convert other
    #   Hashie::Hash values to a SnakyHash::Snake when assigning
    #   instead of respecting the existing subclass
    define_method :convert_value do |val, duping = false| #:nodoc:
      case val
      when self.class
        val.dup
      when ::Hash
        val = val.dup if duping
        self.class.new(val)
      when ::Array
        val.collect { |e| convert_value(e) }
      else
        val
      end
    end

    # converts a camel_cased string to a underscore string
    # subs spaces with underscores, strips whitespace
    # Same way ActiveSupport does string.underscore
    define_method :underscore_string do |str|
      str.to_s.strip
         .tr(" ", "_")
         .gsub(/::/, "/")
         .gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2')
         .gsub(/([a-z\d])([A-Z])/, '\1_\2')
         .tr("-", "_")
         .squeeze("_")
         .downcase
    end
  end
end