Class: Puppet::Pops::Types::PTypeAliasType

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

Overview

Describes a named alias for another Type. The alias is created with a name and an unresolved type expression. The type expression may in turn contain other aliases (including the alias that contains it) which means that an alias might contain self recursion. Whether or not that is the case is computed and remembered when the alias is resolved since guarding against self recursive constructs is relatively expensive.

Defined Under Namespace

Classes: AssertOtherTypeAcceptor, AssertSelfRecursionStatusAcceptor

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from PAnyType

#==, #callable?, #callable_with?, #create, create, #generalize, new_function, #normalize, #roundtrip_with_string?, #simple_name, simple_name, #to_alias_expanded_s

Methods inherited from TypedModelObject

_pcore_type, create_ptype, register_ptypes

Methods included from PuppetObject

#_pcore_all_contents, #_pcore_contents, #_pcore_init_hash, #_pcore_type

Constructor Details

#initialize(name, type_expr, resolved_type = nil) ⇒ PTypeAliasType

Returns a new instance of PTypeAliasType.

Parameters:

  • name (String) —

    The name of the type

  • type_expr (Model::PopsObject) —

    The expression that describes the aliased type

  • resolved_type (PAnyType) (defaults to: nil) —

    the resolve type (only used for the DEFAULT initialization)


3371
3372
3373
3374
3375
3376
 
# File 'lib/puppet/pops/types/types.rb', line 3371

def initialize(name, type_expr, resolved_type = nil)
  @name = name
  @type_expr = type_expr
  @resolved_type = resolved_type
  @self_recursion = false
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *arguments, &block) ⇒ Object

Delegates to resolved type


3540
3541
3542
3543
 
# File 'lib/puppet/pops/types/types.rb', line 3540

def method_missing(name, *arguments, &block)
  super if @resolved_type.equal?(PTypeReferenceType::DEFAULT)
  resolved_type.send(name, *arguments, &block)
end

Instance Attribute Details

#loader ⇒ Object (readonly) 


3366
3367
3368
 
# File 'lib/puppet/pops/types/types.rb', line 3366

def loader
  @loader
end

#name ⇒ Object (readonly) 


3366
3367
3368
 
# File 'lib/puppet/pops/types/types.rb', line 3366

def name
  @name
end

Class Method Details

.register_ptype(loader, ir) ⇒ Object 


3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
 
# File 'lib/puppet/pops/types/types.rb', line 3355

def self.register_ptype(loader, ir)
  create_ptype(loader, ir, 'AnyType',
     'name' => PStringType::NON_EMPTY,
     'type_expr' => PAnyType::DEFAULT,
     'resolved_type' => {
       KEY_TYPE => POptionalType.new(PTypeType::DEFAULT),
       KEY_VALUE => nil
     }
  )
end

Instance Method Details

#accept(visitor, guard) ⇒ Object 


3515
3516
3517
3518
3519
3520
 
# File 'lib/puppet/pops/types/types.rb', line 3515

def accept(visitor, guard)
  guarded_recursion(guard, nil) do |g|
    super(visitor, g)
    @resolved_type.accept(visitor, g) unless @resolved_type.nil?
  end
end

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

Returns:

  • (Boolean) 

3378
3379
3380
3381
3382
3383
3384
3385
 
# File 'lib/puppet/pops/types/types.rb', line 3378

def assignable?(o, guard = nil)
  if @self_recursion
    guard ||= RecursionGuard.new
    guard.with_this(self) { |state| state == RecursionGuard::SELF_RECURSION_IN_BOTH ? true : super(o, guard) }
  else
    super(o, guard)
  end
end

#callable_args?(callable, guard) ⇒ Boolean

Returns:

  • (Boolean) 

3397
3398
3399
 
# File 'lib/puppet/pops/types/types.rb', line 3397

def callable_args?(callable, guard)
  guarded_recursion(guard, false) { |g| resolved_type.callable_args?(callable, g) }
end

#check_self_recursion(originator) ⇒ Object 


3401
3402
3403
 
# File 'lib/puppet/pops/types/types.rb', line 3401

def check_self_recursion(originator)
  resolved_type.check_self_recursion(originator) unless originator.equal?(self)
end

#eql?(o) ⇒ Boolean

Returns:

  • (Boolean) 

3511
3512
3513
 
# File 'lib/puppet/pops/types/types.rb', line 3511

def eql?(o)
  super && o.name == @name
end

#hash ⇒ Object 


3421
3422
3423
 
# File 'lib/puppet/pops/types/types.rb', line 3421

def hash
  @name.hash
end

#instance?(o, guard = nil) ⇒ Boolean

Returns:

  • (Boolean) 

3409
3410
3411
 
# File 'lib/puppet/pops/types/types.rb', line 3409

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

#iterable?(guard = nil) ⇒ Boolean

Returns:

  • (Boolean) 

3413
3414
3415
 
# File 'lib/puppet/pops/types/types.rb', line 3413

def iterable?(guard = nil)
  guarded_recursion(guard, false) { |g| resolved_type.iterable?(g) }
end

#iterable_type(guard = nil) ⇒ Object 


3417
3418
3419
 
# File 'lib/puppet/pops/types/types.rb', line 3417

def iterable_type(guard = nil)
  guarded_recursion(guard, nil) { |g| resolved_type.iterable_type(g) }
end

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

Returns:

  • (Boolean) 

3405
3406
3407
 
# File 'lib/puppet/pops/types/types.rb', line 3405

def kind_of_callable?(optional=true, guard = nil)
  guarded_recursion(guard, false) { |g| resolved_type.kind_of_callable?(optional, g) }
end

#really_instance?(o, 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.

Returns:

  • (Boolean) 

3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
 
# File 'lib/puppet/pops/types/types.rb', line 3546

def really_instance?(o, guard = nil)
  if @self_recursion
    guard ||= RecursionGuard.new
    guard.with_that(o) do
      guard.with_this(self) { |state| state == RecursionGuard::SELF_RECURSION_IN_BOTH ? 0 : resolved_type.really_instance?(o, guard) }
    end
  else
    resolved_type.really_instance?(o, guard)
  end
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. The TypeParser will interpret the contained expression and the resolved type is remembered. This method also checks and remembers if the resolve type contains self recursion.

Parameters:

  • type_parser (TypeParser) —

    type parser that will interpret the type expression

  • loader (Loader::Loader) —

    loader to use when loading type aliases

Returns:


3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
 
# File 'lib/puppet/pops/types/types.rb', line 3471

def resolve(loader)
  @loader = loader
  if @resolved_type.nil?    # resolved to PTypeReferenceType::DEFAULT during resolve to avoid endless recursion

    @resolved_type = PTypeReferenceType::DEFAULT
    @self_recursion = true # assumed while it being found out below
    begin
      if @type_expr.is_a?(PTypeReferenceType)
        @resolved_type = @type_expr.resolve(loader)
      else
        @resolved_type = TypeParser.singleton.interpret(@type_expr, loader).normalize
      end

      # Find out if this type is recursive. A recursive type has performance implications
      # on several methods and this knowledge is used to avoid that for non-recursive
      # types.
      guard = RecursionGuard.new
      real_type_asserter = AssertOtherTypeAcceptor.new
      accept(real_type_asserter, guard)
      unless real_type_asserter.other_type_detected?
        raise ArgumentError, "Type alias '#{name}' cannot be resolved to a real type"
      end
      @self_recursion = guard.recursive_this?(self)      # All aliases involved must re-check status since this alias is now resolved

      if @self_recursion
        accept(AssertSelfRecursionStatusAcceptor.new, RecursionGuard.new)
        when_self_recursion_detected
      end
    rescue
      @resolved_type = nil
      raise
    end
  else
    # An alias may appoint an Object type that isn't resolved yet. The default type
    # reference is used to prevent endless recursion and should not be resolved here.
    @resolved_type.resolve(loader) unless @resolved_type.equal?(PTypeReferenceType::DEFAULT)
  end
  self
end

#resolved_type ⇒ PAnyType

Returns the resolved type. The type must have been resolved by a call prior to calls to this method or an error will be raised.

Returns:

  • (PAnyType) —

    The resolved type of this alias.

Raises:

  • (Puppet::Error) —

    unless the type has been resolved prior to calling this method


3392
3393
3394
3395
 
# File 'lib/puppet/pops/types/types.rb', line 3392

def resolved_type
  raise Puppet::Error, "Reference to unresolved type #{@name}" unless @resolved_type
  @resolved_type
end

#respond_to_missing?(name, include_private) ⇒ Boolean

Delegates to resolved type

Returns:

  • (Boolean) 

3535
3536
3537
 
# File 'lib/puppet/pops/types/types.rb', line 3535

def respond_to_missing?(name, include_private)
  resolved_type.respond_to?(name, include_private)
end

#self_recursion? ⇒ Boolean

Returns:

  • (Boolean) 

3522
3523
3524
 
# File 'lib/puppet/pops/types/types.rb', line 3522

def self_recursion?
  @self_recursion
end

#set_self_recursion_status ⇒ Object 


3454
3455
3456
3457
3458
3459
3460
3461
 
# File 'lib/puppet/pops/types/types.rb', line 3454

def set_self_recursion_status
  return if @self_recursion || @resolved_type.is_a?(PTypeReferenceType)
  @self_recursion = true
  guard = RecursionGuard.new
  accept(NoopTypeAcceptor::INSTANCE, guard)
  @self_recursion = guard.recursive_this?(self)
  when_self_recursion_detected if @self_recursion # no difference
end

#to_s ⇒ String

Returns the expanded string the form of the alias, e.g. <alias name> = <resolved type>

Returns:

  • (String) —

    the expanded form of this alias


3530
3531
3532
 
# File 'lib/puppet/pops/types/types.rb', line 3530

def to_s
  TypeFormatter.singleton.alias_expanded_string(self)
end

#type_expr ⇒ 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.

Returns `nil` to prevent serialization of the type_expr used when first initializing this instance.

Returns:

  • `nil` to prevent serialization of the type_expr used when first initializing this instance


3559
3560
3561
 
# File 'lib/puppet/pops/types/types.rb', line 3559

def type_expr
  nil
end