Class: T::Types::TypedEnumerable

Inherits:
Base
  • Object
show all
Defined in:
lib/types/types/typed_enumerable.rb

Overview

Note: All subclasses of Enumerable should add themselves to the ‘case` statement below in `describe_obj` in order to get better error messages.

Defined Under Namespace

Classes: Untyped

Instance Method Summary collapse

Methods inherited from Base

#==, #error_message_for_obj, #error_message_for_obj_recursive, #hash, method_added, #subtype_of?, #to_s, #validate!

Constructor Details

#initialize(type) ⇒ TypedEnumerable

Returns a new instance of TypedEnumerable.



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# File 'lib/types/types/typed_enumerable.rb', line 9

def initialize(type)
  @inner_type = type
end

Instance Method Details

#build_type ⇒ Object 



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# File 'lib/types/types/typed_enumerable.rb', line 17

def build_type
  type
  nil
end

#describe_obj(obj) ⇒ Object

overrides Base



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# File 'lib/types/types/typed_enumerable.rb', line 109

def describe_obj(obj)
  return super unless obj.is_a?(Enumerable)
  type_from_instance(obj).name
end

#name ⇒ Object

overrides Base



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# File 'lib/types/types/typed_enumerable.rb', line 27

def name
  "T::Enumerable[#{type.name}]"
end

#recursively_valid?(obj) ⇒ Boolean

overrides Base

Returns:



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# File 'lib/types/types/typed_enumerable.rb', line 37

def recursively_valid?(obj)
  return false unless obj.is_a?(Enumerable)
  case obj
  when Array
    begin
      it = 0
      while it < obj.count
        return false unless type.recursively_valid?(obj[it])
        it += 1
      end
      true
    end
  when Hash
    return false unless type.is_a?(FixedArray)
    types = type.types
    return false if types.count != 2
    key_type = types[0]
    value_type = types[1]
    obj.each_pair do |key, val|
      # Some objects (I'm looking at you Rack::Utils::HeaderHash) don't
      # iterate over a [key, value] array, so we can't just use the type.recursively_valid?(v)
      return false if !key_type.recursively_valid?(key) || !value_type.recursively_valid?(val)
    end
    true
  when Enumerator::Lazy
    # Enumerators can be unbounded: see `[:foo, :bar].cycle`
    true
  when Enumerator::Chain
    # Enumerators can be unbounded: see `[:foo, :bar].cycle`
    true
  when Enumerator
    # Enumerators can be unbounded: see `[:foo, :bar].cycle`
    true
  when Range
    # A nil beginning or a nil end does not provide any type information. That is, nil in a range represents
    # boundlessness, it does not express a type. For example `(nil...nil)` is not a T::Range[NilClass], its a range
    # of unknown types (T::Range[T.untyped]).
    # Similarly, `(nil...1)` is not a `T::Range[T.nilable(Integer)]`, it's a boundless range of Integer.
    (obj.begin.nil? || type.recursively_valid?(obj.begin)) && (obj.end.nil? || type.recursively_valid?(obj.end))
  when Set
    obj.each do |item|
      return false unless type.recursively_valid?(item)
    end

    true
  else
    # We don't check the enumerable since it isn't guaranteed to be
    # rewindable (e.g. STDIN) and it may be expensive to enumerate
    # (e.g. an enumerator that makes an HTTP request)"
    true
  end
end

#type ⇒ Object 



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# File 'lib/types/types/typed_enumerable.rb', line 13

def type
  @type ||= T::Utils.coerce(@inner_type)
end

#underlying_class ⇒ Object 



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# File 'lib/types/types/typed_enumerable.rb', line 22

def underlying_class
  Enumerable
end

#valid?(obj) ⇒ Boolean

overrides Base

Returns:



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# File 'lib/types/types/typed_enumerable.rb', line 32

def valid?(obj)
  obj.is_a?(Enumerable)
end