Class: Orthoses::Utils::TypeList

Inherits:
Object
  • Object
show all
Defined in:
lib/orthoses/utils/type_list.rb

Overview

internal

Constant Summary collapse

UNTYPED = 
::RBS::Types::Bases::Any.new(location: nil)
NIL_TYPE = 
::RBS::Types::Bases::Nil.new(location: nil)
TRUE_TYPE = 
::RBS::Types::Literal.new(literal: true, location: nil)
FALSE_TYPE = 
::RBS::Types::Literal.new(literal: false, location: nil)
BOOL_TYPE = 
::RBS::Types::Bases::Bool.new(location: nil)

Instance Method Summary collapse

Constructor Details

#initialize(types) ⇒ TypeList

Returns a new instance of TypeList.



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# File 'lib/orthoses/utils/type_list.rb', line 13

def initialize(types)
  @types = types
end

Instance Method Details

#inject ⇒ Object 



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# File 'lib/orthoses/utils/type_list.rb', line 17

def inject
  normalize

  uniqed = @types.uniq

  return UNTYPED if uniqed.find { |t| t == UNTYPED }

  has_true = uniqed.delete(TRUE_TYPE)
  has_false = uniqed.delete(FALSE_TYPE)
  if has_true || has_false
    uniqed << BOOL_TYPE
  end

  return UNTYPED if uniqed.empty?
  return uniqed.first if uniqed.length == 1

  args_or_other = uniqed.group_by do |type|
    type.respond_to?(:args) && !type.args.empty?
  end
  if args_or_other[true]
    # { Array => [Array[Intger], Array[String]], Hash => [Hash[untyped, untyped]], ... }
    type_by_name = args_or_other[true].group_by do |type|
      type.name
    end
    type_by_name.each do |name, types|
      if with_untyped_type = types.find { |type| type.args.include?(UNTYPED) }
        types.replace([with_untyped_type])
      end
    end
    args_injected = type_by_name.values.flatten
    args_injected.concat(args_or_other[false]) if args_or_other[false]
    uniqed = args_injected
  end

  after_optional = uniqed.delete(NIL_TYPE)
  injected = uniqed.inject do |r, type|
    case r
    when ::RBS::Types::Union
      r.tap { r.types << type }
    else
      ::RBS::Types::Union.new(types: [r, type], location: nil)
    end
  end

  if after_optional
    return ::RBS::Types::Optional.new(type: injected, location: nil)
  end

  injected
end