Module: LightMapper::Helper

Defined in:
lib/light_mapper.rb

Class Method Summary collapse

Class Method Details

.array_key_extractor(object, current, full_path, strict, _any_keys) ⇒ Object 



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# File 'lib/light_mapper.rb', line 49

def self.array_key_extractor(object, current, full_path, strict, _any_keys)
  index = current.to_s.match(/^(\d)+$/) ? current.to_i : nil

  if index
    raise_key_missing(current, full_path) if strict && index && object.size < index.next

    object[index]
  else
    method_name = current.to_s.to_sym
    raise_key_missing(current, full_path, "Array do not respond on #{method_name}") if strict && !object.respond_to?(method_name)

    object.public_send(method_name)
  end
end

.hash_key_extractor(object, current, full_path, strict, any_keys) ⇒ Object 



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# File 'lib/light_mapper.rb', line 42

def self.hash_key_extractor(object, current, full_path, strict, any_keys)
  keys = any_keys ? [current, current.to_s, current.to_s.to_sym] : [current]
  raise_key_missing(current, full_path) if strict && !keys.any? { |k| object.key?(k) }

  object.values_at(*keys).compact.first
end

.key_destructor(value) ⇒ Object 



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# File 'lib/light_mapper.rb', line 13

def self.key_destructor(value)
  case value
  in String
    value.split('.')
  in Symbol
    [value]
  in Array
    value
  else
    raise InvalidKey, "Invalid key type: #{value.class}"
  end
end

.raise_key_missing(current, full_path, additional_message = nil) ⇒ Object

Raises:



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# File 'lib/light_mapper.rb', line 8

def self.raise_key_missing(current, full_path, additional_message = nil)

  raise KeyMissing, ["#{current} key not found; Full path #{full_path.map(&:to_s).join('.')}", additional_message].compact.join('; ')
end

.value_extractor(object, current, path, full_path, strict = false, any_keys = false) ⇒ Object 



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# File 'lib/light_mapper.rb', line 26

def self.value_extractor(object, current, path, full_path, strict = false, any_keys = false)
  result = case object
           in Hash
             hash_key_extractor(object, current, full_path, strict, any_keys)
           in Array
             array_key_extractor(object, current, full_path, strict, any_keys)
          in NilClass
             nil
          else
            method_name = current.to_s.to_sym
            object.respond_to?(method_name) ? object.send(method_name) : !strict ? nil : raise_key_missing(current, full_path)
          end

  path.compact.empty? ? result : value_extractor(result, path.first, path[1..-1], full_path, strict, any_keys)
end