Class: Puppet::Pops::Types::PAnyType

Inherits:
TypedModelObject show all
Defined in:
lib/puppet/pops/types/types.rb

Overview

Base type for all types

Constant Summary collapse

DEFAULT =

The default instance of this type. Each type in the type system has this constant declared.

PAnyType.new

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from TypedModelObject

_pcore_type, create_ptype, register_ptypes

Methods included from PuppetObject

#_pcore_all_contents, #_pcore_contents, #_pcore_init_hash, #_pcore_type

Class Method Details

.create(*args) ⇒ Object 


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# File 'lib/puppet/pops/types/types.rb', line 82

def self.create(*args)
  # NOTE! Important to use self::DEFAULT and not just DEFAULT since the latter yields PAnyType::DEFAULT
  args.empty? ? self::DEFAULT : new(*args)
end

.new_function(type) ⇒ Function

This default implementation of of a new_function raises an Argument Error. Types for which creating a new instance is supported, should create and return a Puppet Function class by using Puppet:Loaders.create_loaded_function(:new, loader) and return that result.

Raises:

  • (ArgumentError) 

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# File 'lib/puppet/pops/types/types.rb', line 342

def self.new_function(type)
  raise ArgumentError.new("Creation of new instance of type '#{type}' is not supported")
end

.register_ptype(loader, ir) ⇒ Object 


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# File 'lib/puppet/pops/types/types.rb', line 78

def self.register_ptype(loader, ir)
  @type = Pcore::create_object_type(loader, ir, self, 'Pcore::AnyType', 'Any', EMPTY_HASH)
end

.simple_name ⇒ String

Strips the class name from all module prefixes, the leading 'P' and the ending 'Type'. I.e. an instance of PVariantType will return 'Variant'


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# File 'lib/puppet/pops/types/types.rb', line 296

def self.simple_name
  @simple_name ||= (
    n = name
    n[n.rindex(DOUBLE_COLON)+3..n.size-5].freeze
  )
end

Instance Method Details

#==(o) ⇒ Object 


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# File 'lib/puppet/pops/types/types.rb', line 285

def ==(o)
  eql?(o)
end

#accept(visitor, guard) ⇒ Object

Accept a visitor that will be sent the message `visit`, once with `self` as the argument. The visitor will then visit all types that this type contains.


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# File 'lib/puppet/pops/types/types.rb', line 90

def accept(visitor, guard)
  visitor.visit(self, guard)
end

#assignable?(o, guard = nil) ⇒ Boolean

Checks if o is a type that is assignable to this type. If o is a `Class` then it is first converted to a type. If o is a Variant, then it is considered assignable when all its types are assignable

The check for assignable must be guarded against self recursion since `self`, the given type o, or both, might be a `TypeAlias`. The initial caller of this method will typically never care about this and hence pass only the first argument, but as soon as a check of a contained type encounters a `TypeAlias`, then a `RecursionGuard` instance is created and passed on in all subsequent calls. The recursion is allowed to continue until self recursion has been detected in both `self` and in the given type. At that point the given type is considered to be assignable to `self` since all checks up to that point were positive.


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# File 'lib/puppet/pops/types/types.rb', line 110

def assignable?(o, guard = nil)
  case o
  when Class    # Safe to call _assignable directly since a Class never is a Unit or Variant

    _assignable?(TypeCalculator.singleton.type(o), guard)
  when PUnitType
    true
  when PTypeAliasType    # An alias may contain self recursive constructs.

    if o.self_recursion?
      guard ||= RecursionGuard.new
      if guard.add_that(o) == RecursionGuard::SELF_RECURSION_IN_BOTH        # Recursion detected both in self and other. This means that other is assignable
        # to self. This point would not have been reached otherwise

        true
      else
        assignable?(o.resolved_type, guard)
      end
    else
      assignable?(o.resolved_type, guard)
    end
  when PVariantType    # Assignable if all contained types are assignable, or if this is exactly Any

    return true if self.class == PAnyType    # An empty variant may be assignable to NotUndef[T] if T is assignable to empty variant

    return _assignable?(o, guard) if is_a?(PNotUndefType) && o.types.empty?
    !o.types.empty? && o.types.all? { |vt| assignable?(vt, guard) }
  when POptionalType    # Assignable if undef and contained type is assignable

    assignable?(PUndefType::DEFAULT) && (o.type.nil? || assignable?(o.type))
  when PNotUndefType
    if !(o.type.nil? || o.type.assignable?(PUndefType::DEFAULT))
      assignable?(o.type, guard)
    else
      _assignable?(o, guard)
    end
  else
    _assignable?(o, guard)
  end
end

#callable?(args_type, guard = nil) ⇒ Boolean

Returns `true` if this instance is a callable that accepts the given args_type type


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# File 'lib/puppet/pops/types/types.rb', line 156

def callable?(args_type, guard = nil)
  args_type.is_a?(PAnyType) && kind_of_callable? && args_type.callable_args?(self, guard)
end

#callable_args?(callable, guard) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns `true` if this instance is considered valid as arguments to the given `callable`


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# File 'lib/puppet/pops/types/types.rb', line 174

def callable_args?(callable, guard)
  false
end

#callable_with?(args, block = nil) ⇒ Boolean

Returns `true` if this instance is a callable that accepts the given args


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# File 'lib/puppet/pops/types/types.rb', line 165

def callable_with?(args,  block = nil)
  false
end

#check_self_recursion(originator) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Called from the `PTypeAliasType` when it detects self recursion. The default is to do nothing but some self recursive constructs are illegal such as when a `PObjectType` somehow inherits itself

Raises:

  • Puppet::Error if an illegal self recursion is detected


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# File 'lib/puppet/pops/types/types.rb', line 183

def check_self_recursion(originator)
end

#create(*args) ⇒ Object 


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# File 'lib/puppet/pops/types/types.rb', line 318

def create(*args)
  Loaders.find_loader(nil).load(:function, 'new').call({}, self, *args)
end

#eql?(o) ⇒ Boolean 


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# File 'lib/puppet/pops/types/types.rb', line 281

def eql?(o)
  self.class == o.class
end

#generalize ⇒ PAnyType

Generalizes value specific types. Types that are not value specific will return `self` otherwise the generalized type is returned.


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# File 'lib/puppet/pops/types/types.rb', line 191

def generalize  # Applicable to all types that have no variables

  self
end

#hash ⇒ Object 


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# File 'lib/puppet/pops/types/types.rb', line 260

def hash
  self.class.hash
end

#instance?(o, guard = nil) ⇒ Boolean

Returns true if the given argument o is an instance of this type


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# File 'lib/puppet/pops/types/types.rb', line 268

def instance?(o, guard = nil)
  true
end

#iterable?(guard = nil) ⇒ Boolean

Returns `true` if an instance of this type is iterable, `false` otherwise The method #iterable_type must produce a `PIterableType` instance when this method returns `true`


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# File 'lib/puppet/pops/types/types.rb', line 240

def iterable?(guard = nil)
  false
end

#iterable_type(guard = nil) ⇒ PIterableType?

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns the `PIterableType` that this type should be assignable to, or `nil` if no such type exists. A type that returns a `PIterableType` must respond `true` to `#iterable?`.

Examples:

Any Collection[T] is assignable to an Iterable[T]
A String is assignable to an Iterable[String] iterating over the strings characters
An Integer is assignable to an Iterable[Integer] iterating over the 'times' enumerator
A Type[T] is assignable to an Iterable[Type[T]] if T is an Integer or Enum

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# File 'lib/puppet/pops/types/types.rb', line 256

def iterable_type(guard = nil)
  nil
end

#kind_of_callable?(optional = true, guard = nil) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Responds `true` for all callables, variants of callables and unless optional is false, all optional callables.


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# File 'lib/puppet/pops/types/types.rb', line 230

def kind_of_callable?(optional = true, guard = nil)
  false
end

#loader ⇒ Loaders::Loader

Returns the loader that loaded this type.


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# File 'lib/puppet/pops/types/types.rb', line 198

def loader
  Loaders.static_loader
end

#name ⇒ String

Returns the name of the type, without parameters


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# File 'lib/puppet/pops/types/types.rb', line 314

def name
  simple_name
end

#new_function ⇒ Function

Create an instance of this type. The default implementation will just dispatch the call to the class method with the same name and pass `self` as the first argument.


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# File 'lib/puppet/pops/types/types.rb', line 329

def new_function
  self.class.new_function(self)
end

#normalize(guard = nil) ⇒ PAnyType

Normalizes the type. This does not change the characteristics of the type but it will remove duplicates and constructs like NotUndef where T is not assignable from Undef and change Variant where all T are enums into an Enum.


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# File 'lib/puppet/pops/types/types.rb', line 209

def normalize(guard = nil)
  self
end

#really_instance?(o, guard = nil) ⇒ Integer

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

An object is considered to really be an instance of a type when something other than a TypeAlias or a Variant responds true to a call to #instance?.


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# File 'lib/puppet/pops/types/types.rb', line 277

def really_instance?(o, guard = nil)
  instance?(o, guard) ? 1 : -1
end

#resolve(loader) ⇒ PTypeAliasType

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Called from the TypeParser once it has found a type using the Loader to enable that this type can resolve internal type expressions using a loader. Presently, this method is a no-op for all types except the {PTypeAliasType}.


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# File 'lib/puppet/pops/types/types.rb', line 220

def resolve(loader)
  self
end

#roundtrip_with_string? ⇒ Boolean

Answers the question if instances of this type can represent themselves as a string that can then be passed to the create method


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# File 'lib/puppet/pops/types/types.rb', line 350

def roundtrip_with_string?
  false
end

#simple_name ⇒ Object 


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# File 'lib/puppet/pops/types/types.rb', line 289

def simple_name
  self.class.simple_name
end

#to_alias_expanded_s ⇒ Object 


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# File 'lib/puppet/pops/types/types.rb', line 303

def to_alias_expanded_s
  TypeFormatter.new.alias_expanded_string(self)
end

#to_s ⇒ Object 


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# File 'lib/puppet/pops/types/types.rb', line 307

def to_s
  TypeFormatter.string(self)
end