module MultiJson::ConvertibleHashKeys

Mixin for converting hash keys between symbols and strings

@api private

Constants

SIMPLE_OBJECT_CLASSES

Private Instance Methods

convert_hash_keys(value, &key_modifier) click to toggle source

Recursively converts hash keys using the given block

@api private @param value [Object] value to convert @yield [key] block to transform each key @return [Object] converted value

# File lib/multi_json/convertible_hash_keys.rb, line 35
def convert_hash_keys(value, &key_modifier)
  case value
  when Hash
    value.to_h { |k, v| [key_modifier.call(k), convert_hash_keys(v, &key_modifier)] }
  when Array
    value.map { |v| convert_hash_keys(v, &key_modifier) }
  else
    convert_simple_object(value)
  end
end

convert_simple_object(obj) click to toggle source

Converts non-hash objects to a JSON-safe format

@api private @param obj [Object] object to convert @return [Object] converted object

# File lib/multi_json/convertible_hash_keys.rb, line 51
def convert_simple_object(obj)
  return obj if simple_object?(obj) || obj.respond_to?(:to_json)

  obj.respond_to?(:to_s) ? obj.to_s : obj
end

simple_object?(obj) click to toggle source

Checks if an object is a simple JSON-safe type

@api private @param obj [Object] object to check @return [Boolean] true if object is a simple type

# File lib/multi_json/convertible_hash_keys.rb, line 62
def simple_object?(obj)
  SIMPLE_OBJECT_CLASSES.any? { |klass| obj.is_a?(klass) }
end

stringify_keys(value) click to toggle source

Converts hash keys to strings recursively

@api private @param value [Object] value to convert @return [Object] value with stringified keys

# File lib/multi_json/convertible_hash_keys.rb, line 25
def stringify_keys(value)
  convert_hash_keys(value) { |key| key.respond_to?(:to_s) ? key.to_s : key }
end

symbolize_keys(value) click to toggle source

Converts hash keys to symbols recursively

@api private @param value [Object] value to convert @return [Object] value with symbolized keys

# File lib/multi_json/convertible_hash_keys.rb, line 16
def symbolize_keys(value)
  convert_hash_keys(value) { |key| key.respond_to?(:to_sym) ? key.to_sym : key }
end