class Crystal::Macros::TypeNode

Overview

Represents a type in the program, like Int32 or String.

Defined in:

compiler/crystal/macros.cr

Instance Method Summary

Instance methods inherited from class Crystal::Macros::ASTNode

!=(other : ASTNode) : BoolLiteral !=, ==(other : ASTNode) : BoolLiteral ==, class_name : StringLiteral class_name, column_number : StringLiteral | NilLiteral column_number, end_column_number : StringLiteral | NilLiteral end_column_number, end_line_number : StringLiteral | NilLiteral end_line_number, filename : StringLiteral | NilLiteral filename, id : MacroId id, line_number : StringLiteral | NilLiteral line_number, raise(message) : NoReturn raise, stringify : StringLiteral stringify, symbolize : SymbolLiteral symbolize

Instance methods inherited from class Reference

==(other : self)
==(other : JSON::Any)
==(other : YAML::Any)
==(other)
==
, dup dup, hash(hasher) hash, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference)
same?(other : Nil)
same?
, to_s(io : IO) : Nil to_s

Constructor methods inherited from class Reference

new new

Instance methods inherited from class Object

! : Bool !, !=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other)
===
, =~(other) =~, as(type : Class) as, as?(type : Class) as?, class class, dup dup, hash
hash(hasher)
hash
, inspect(io : IO) : Nil
inspect : String
inspect
, is_a?(type : Class) : Bool is_a?, itself itself, nil? : Bool nil?, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, responds_to?(name : Symbol) : Bool responds_to?, tap(&) tap, to_json(io : IO)
to_json
to_json
, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ")
to_pretty_json
, to_s : String
to_s(io : IO) : Nil
to_s
, to_yaml(io : IO)
to_yaml
to_yaml
, try(&) try, unsafe_as(type : T.class) forall T unsafe_as

Constructor methods inherited from class Object

from_json(string_or_io, root : String) : self
from_json(string_or_io) : self
from_json
, from_yaml(string_or_io : String | IO) : self from_yaml

Instance Method Detail

def <(other : TypeNode) : BoolLiteral #

Returns true if other is an ancestor of self.


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def <=(other : TypeNode) : BoolLiteral #

Returns true if self is the same as other or if other is an ancestor of self.


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def >(other : TypeNode) : BoolLiteral #

Returns true if self is an ancestor of other.


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def >=(other : TypeNode) : BoolLiteral #

Returns true if other is the same as self or if self is an ancestor of other.


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def [](key : SymbolLiteral | MacroId) : TypeNode | NilLiteral #

Returns the type for the given key in this named tuple type. Gives a compile error if this is not a named tuple type.


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def abstract? : BoolLiteral #

Returns true if this type is abstract.


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def all_subclasses : Crystal::Macros::ArrayLiteral(TypeNode) #

Returns all subclasses of this type.


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Returns all ancestors of this type.


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def annotation(type : TypeNode) : Annotation | NilLiteral #

Returns the last Annotation with the given type attached to this variable or NilLiteral if there are none.


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def annotations(type : TypeNode) : Crystal::Macros::ArrayLiteral(Annotation) #

Returns an array of annotations with the given type attached to this variable, or an empty ArrayLiteral if there are none.


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def class : TypeNode #

Returns the class of this type. With this you can, for example, obtain class methods by invoking type.class.methods.


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Returns the class variables of this type.


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def constant(name : StringLiteral | SymbolLiteral | MacroId) : ASTNode #

Returns a constant defined in this type.

If the constant is a constant (like A = 1), then its value as an ASTNode is returned. If the constant is a type, the type is returned as a TypeNode. Otherwise, NilLiteral is returned.


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Returns the constants and types defined by this type.


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def has_attribute?(name : StringLiteral | SymbolLiteral) : BoolLiteral #

Returns true if this type has an attribute. For example @[Flags] or @[Packed] (the name you pass to this method is "Flags" or "Packed" in these cases).


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def has_constant?(name : StringLiteral | SymbolLiteral) : BoolLiteral #

Returns true if this type has a constant. For example DEFAULT_OPTIONS (the name you pass to this method is "DEFAULT_OPTIONS" or :DEFAULT_OPTIONS in this cases).


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def has_method?(name : StringLiteral | SymbolLiteral) : BoolLiteral #

Returns true if this type has a method. For example default_options (the name you pass to this method is "default_options" or :default_options in this cases).


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def instance : TypeNode #

Returns the instance type of this type, if it's a class type, or self otherwise. This is the opposite of #class.


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def instance_vars : Crystal::Macros::ArrayLiteral(MetaVar) #

Returns the instance variables of this type.


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Returns the keys in this named tuple type. Gives a compile error if this is not a named tuple type.


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Returns the instance methods defined by this type, without including inherited methods.


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def name : MacroId #

Returns the fully qualified name of this type.


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def nilable? : BoolLiteral #

Returns true if this type is nilable (if it has Nil amongst its types).


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def overrides?(type : TypeNode, method : StringLiteral | SymbolLiteral | MacroId) : Bool #

Determines if self overrides any method named method from type type.

class Foo
  def one
    1
  end

  def two
    2
  end
end

class Bar < Foo
  def one
    11
  end
end

{{ Bar.overrides?(Foo, "one") }} # => true
{{ Bar.overrides?(Foo, "two") }} # => false

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def resolve : TypeNode #

Returns self. This method exists so you can safely call #resolve on a node and resolve it to a type, even if it's a type already.


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def resolve? : TypeNode #

Returns self. This method exists so you can safely call #resolve on a node and resolve it to a type, even if it's a type already.


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def size : NumberLiteral #

Returns the number of elements in this tuple type or tuple metaclass type. Gives a compile error if this is not one of those types.


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Returns the direct subclasses of this type.


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def superclass : TypeNode | NilLiteral #

Returns the direct superclass of this type.


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Returns the type variables of the generic type. If the type is not generic, an empty array is returned.


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def union? : BoolLiteral #

Returns true if this type is a union type, false otherwise.

See also: #union_types.


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Returns the types forming a union type, if this is a union type. Otherwise returns this single type inside an array literal (so you can safely call #union_types on any type and treat all types uniformly).

See also: #union?.


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