Represents a singleton class declaration involving the ‘class` keyword.
class << self end ^^^^^^^^^^^^^^^^^
attr_reader expression: Prism::node
attr_reader body: Prism::node?
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16780
def initialize(source, locals, class_keyword_loc, operator_loc, expression, body, end_keyword_loc, location)
@source = source
@location = location
@locals = locals
@class_keyword_loc = class_keyword_loc
@operator_loc = operator_loc
@expression = expression
@body = body
@end_keyword_loc = end_keyword_loc
end
def initialize: (Array locals, Location class_keyword_loc, Location operator_loc, Prism::node expression, Prism::node? body, Location end_keyword_loc, Location location) -> void
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16901
def self.type
:singleton_class_node
end
Similar to type, this method returns a symbol that you can use for splitting on the type of the node without having to do a long === chain. Note that like type, it will still be slower than using == for a single class, but should be faster in a case statement or an array comparison.
def self.type: () -> Symbol
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16907
def ===(other)
other.is_a?(SingletonClassNode) &&
(locals.length == other.locals.length) &&
locals.zip(other.locals).all? { |left, right| left === right } &&
(class_keyword_loc.nil? == other.class_keyword_loc.nil?) &&
(operator_loc.nil? == other.operator_loc.nil?) &&
(expression === other.expression) &&
(body === other.body) &&
(end_keyword_loc.nil? == other.end_keyword_loc.nil?)
end
Implements case-equality for the node. This is effectively == but without comparing the value of locations. Locations are checked only for presence.
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16792
def accept(visitor)
visitor.visit_singleton_class_node(self)
end
def accept: (Visitor visitor) -> void
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16797
def child_nodes
[expression, body]
end
def child_nodes: () -> Array[nil | Node]
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16858
def class_keyword
class_keyword_loc.slice
end
def class_keyword: () -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16831
def class_keyword_loc
location = @class_keyword_loc
return location if location.is_a?(Location)
@class_keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
attr_reader class_keyword_loc: Location
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16810
def comment_targets
[class_keyword_loc, operator_loc, expression, *body, end_keyword_loc] #: Array[Prism::node | Location]
end
def comment_targets: () -> Array[Node | Location]
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16802
def compact_child_nodes
compact = [] #: Array[Prism::node]
compact << expression
compact << body if body
compact
end
def compact_child_nodes: () -> Array
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16815
def copy(locals: self.locals, class_keyword_loc: self.class_keyword_loc, operator_loc: self.operator_loc, expression: self.expression, body: self.body, end_keyword_loc: self.end_keyword_loc, location: self.location)
SingletonClassNode.new(source, locals, class_keyword_loc, operator_loc, expression, body, end_keyword_loc, location)
end
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16823
def deconstruct_keys(keys)
{ locals: locals, class_keyword_loc: class_keyword_loc, operator_loc: operator_loc, expression: expression, body: body, end_keyword_loc: end_keyword_loc, location: location }
end
def deconstruct_keys: (Array keys) -> { locals: Array, class_keyword_loc: Location, operator_loc: Location, expression: Prism::node, body: Prism::node?, end_keyword_loc: Location, location: Location }
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16868
def end_keyword
end_keyword_loc.slice
end
def end_keyword: () -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16851
def end_keyword_loc
location = @end_keyword_loc
return location if location.is_a?(Location)
@end_keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
attr_reader end_keyword_loc: Location
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16873
def inspect
InspectVisitor.compose(self)
end
def inspect -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16863
def operator
operator_loc.slice
end
def operator: () -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16838
def operator_loc
location = @operator_loc
return location if location.is_a?(Location)
@operator_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
attr_reader operator_loc: Location
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 16891
def type
:singleton_class_node
end
Sometimes you want to check an instance of a node against a list of classes to see what kind of behavior to perform. Usually this is done by calling ‘[cls1, cls2].include?(node.class)` or putting the node into a case statement and doing `case node; when cls1; when cls2; end`. Both of these approaches are relatively slow because of the constant lookups, method calls, and/or array allocations.
Instead, you can call type, which will return to you a symbol that you can use for comparison. This is faster than the other approaches because it uses a single integer comparison, but also because if you’re on CRuby you can take advantage of the fact that case statements with all symbol keys will use a jump table.
def type: () -> Symbol