Module: Mangrove::TryFromExt

Extended by:
T::Helpers, T::Sig
Includes:
Kernel
Defined in:
lib/mangrove/try_from_ext.rb

Instance Method Summary collapse

Instance Method Details

#try_convert_from(from:, to:, err:, &block) ⇒ void

This method returns an undefined value.

Parameters:

  • from (T::Class[T.type_parameter(:I)])
  • to (T::Class[T.type_parameter(:O)])
  • err (T::Class[T.type_parameter(:E)])
  • block (T.proc.params(arg: T.type_parameter(:I)).returns(Mangrove::Result[T.type_parameter(:O), T.type_parameter(:E)])) 


21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
 
# File 'lib/mangrove/try_from_ext.rb', line 21

def try_convert_from(from:, to:, err:, &block)
  T.bind(self, T::Class[T.type_parameter(:O)])

  vars = from.instance_variable_get(:@convertable_to) || {}
  vars[self] = block
  from.instance_variable_set(:@convertable_to, vars)

  @convertable_from ||= {}
  @convertable_from[from] = [err, block]

  into_t = T.cast(self, Class)

  from.define_method("try_into_#{T.must_because(into_t.name) { "name is required" }.gsub(/::|([A-Z]+)([A-Z][a-z])/, '\1_\2').gsub(/([a-z\d])([A-Z])/, '\1_\2').downcase}") do
    proc = T.unsafe(self).class.ancestors.lazy.map { |klass| klass.instance_variable_get(:@convertable_to)&.[](into_t) }.find(&:itself)

    proc.call(self)
  end
end