# class Prism::UnlessNode

Represents the use of the ‘unless` keyword, either in the block form or the modifier form.

    bar unless foo
    ^^^^^^^^^^^^^^

    unless foo then bar end
    ^^^^^^^^^^^^^^^^^^^^^^^

### Attributes

else_clause [R]

The else clause of the unless expression, if present.

    unless cond then bar else baz end
                         ^^^^^^^^

predicate [R]

The condition to be evaluated for the unless expression. It can be any [non-void expression](github.com/ruby/prism/blob/main/docs/parsing_rules.md#non-void-expression).

    unless cond then bar end
           ^^^^

    bar unless cond
               ^^^^

statements [R]

The body of statements that will executed if the unless condition is falsey. Will be ‘nil` if no body is provided.

    unless cond then bar end
                     ^^^

### Public Class Methods

new (source, node_id, location, flags, keyword_loc, predicate, then_keyword_loc, statements, else_clause, end_keyword_loc)
Source

    # File lib/prism/node.rb, line 17503
    def initialize(source, node_id, location, flags, keyword_loc, predicate, then_keyword_loc, statements, else_clause, end_keyword_loc)
      @source = source
      @node_id = node_id
      @location = location
      @flags = flags
      @keyword_loc = keyword_loc
      @predicate = predicate
      @then_keyword_loc = then_keyword_loc
      @statements = statements
      @else_clause = else_clause
      @end_keyword_loc = end_keyword_loc
    end

Initialize a new `UnlessNode` node.

type ()
Source

    # File lib/prism/node.rb, line 17664
    def self.type
      :unless_node
    end

Return a symbol representation of this node type. See ‘Node::type`.

### Public Instance Methods

=== (other)
Source

    # File lib/prism/node.rb, line 17670
    def ===(other)
      other.is_a?(UnlessNode) &&
        (keyword_loc.nil? == other.keyword_loc.nil?) &&
        (predicate === other.predicate) &&
        (then_keyword_loc.nil? == other.then_keyword_loc.nil?) &&
        (statements === other.statements) &&
        (else_clause === other.else_clause) &&
        (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.

accept (visitor)
Source

    # File lib/prism/node.rb, line 17517
    def accept(visitor)
      visitor.visit_unless_node(self)
    end

def accept: (`Visitor` visitor) -> void

child_nodes ()
Source

    # File lib/prism/node.rb, line 17522
    def child_nodes
      [predicate, statements, else_clause]
    end

def `child_nodes`: () -> Array[nil | Node]

Also aliased as: deconstruct
comment_targets ()
Source

    # File lib/prism/node.rb, line 17536
    def comment_targets
      [keyword_loc, predicate, *then_keyword_loc, *statements, *else_clause, *end_keyword_loc] #: Array[Prism::node | Location]
    end

def `comment_targets`: () -> Array[Node | Location]

compact_child_nodes ()
Source

    # File lib/prism/node.rb, line 17527
    def compact_child_nodes
      compact = [] #: Array[Prism::node]
      compact << predicate
      compact << statements if statements
      compact << else_clause if else_clause
      compact
    end

def `compact_child_nodes`: () -> Array

consequent ()
Source

    # File lib/prism/node_ext.rb, line 503
    def consequent
      deprecated("else_clause")
      else_clause
    end

Returns the else clause of the unless node. This method is deprecated in favor of `else_clause`.

copy (node_id: self.node_id, location: self.location, flags: self.flags, keyword_loc: self.keyword_loc, predicate: self.predicate, then_keyword_loc: self.then_keyword_loc, statements: self.statements, else_clause: self.else_clause, end_keyword_loc: self.end_keyword_loc)
Source

    # File lib/prism/node.rb, line 17541
    def copy(node_id: self.node_id, location: self.location, flags: self.flags, keyword_loc: self.keyword_loc, predicate: self.predicate, then_keyword_loc: self.then_keyword_loc, statements: self.statements, else_clause: self.else_clause, end_keyword_loc: self.end_keyword_loc)
      UnlessNode.new(source, node_id, location, flags, keyword_loc, predicate, then_keyword_loc, statements, else_clause, end_keyword_loc)
    end

def copy: (?node_id: `Integer`, ?location: `Location`, ?flags: `Integer`, ?keyword_loc: `Location`, ?predicate: Prism::node, ?then_keyword_loc: `Location`?, ?statements: `StatementsNode`?, ?else_clause: `ElseNode`?, ?end_keyword_loc: `Location`?) -> `UnlessNode`

deconstruct ()

def deconstruct: () -> Array[nil | Node]

Alias for: child_nodes
deconstruct_keys (keys)
Source

    # File lib/prism/node.rb, line 17549
    def deconstruct_keys(keys)
      { node_id: node_id, location: location, keyword_loc: keyword_loc, predicate: predicate, then_keyword_loc: then_keyword_loc, statements: statements, else_clause: else_clause, end_keyword_loc: end_keyword_loc }
    end

def `deconstruct_keys`: (Array keys) -> { node_id: `Integer`, location: `Location`, `keyword_loc`: `Location`, predicate: Prism::node, `then_keyword_loc`: `Location`?, statements: `StatementsNode`?, `else_clause`: `ElseNode`?, `end_keyword_loc`: `Location`? }

end_keyword ()
Source

    # File lib/prism/node.rb, line 17649
    def end_keyword
      end_keyword_loc&.slice
    end

def `end_keyword`: () -> `String`?

end_keyword_loc ()
Source

    # File lib/prism/node.rb, line 17620
    def end_keyword_loc
      location = @end_keyword_loc
      case location
      when nil
        nil
      when Location
        location
      else
        @end_keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
      end
    end

The location of the ‘end` keyword, if present.

    unless cond then bar end
                         ^^^

inspect ()
Source

    # File lib/prism/node.rb, line 17654
    def inspect
      InspectVisitor.compose(self)
    end

def inspect -> `String`

keyword ()
Source

    # File lib/prism/node.rb, line 17639
    def keyword
      keyword_loc.slice
    end

def keyword: () -> `String`

keyword_loc ()
Source

    # File lib/prism/node.rb, line 17560
    def keyword_loc
      location = @keyword_loc
      return location if location.is_a?(Location)
      @keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
    end

The location of the ‘unless` keyword.

    unless cond then bar end
    ^^^^^^

    bar unless cond
        ^^^^^^

save_end_keyword_loc (repository)
Source

    # File lib/prism/node.rb, line 17634
    def save_end_keyword_loc(repository)
      repository.enter(node_id, :end_keyword_loc) unless @end_keyword_loc.nil?
    end

Save the `end_keyword_loc` location using the given saved source so that it can be retrieved later.

save_keyword_loc (repository)
Source

    # File lib/prism/node.rb, line 17568
    def save_keyword_loc(repository)
      repository.enter(node_id, :keyword_loc)
    end

Save the `keyword_loc` location using the given saved source so that it can be retrieved later.

save_then_keyword_loc (repository)
Source

    # File lib/prism/node.rb, line 17599
    def save_then_keyword_loc(repository)
      repository.enter(node_id, :then_keyword_loc) unless @then_keyword_loc.nil?
    end

Save the `then_keyword_loc` location using the given saved source so that it can be retrieved later.

then_keyword ()
Source

    # File lib/prism/node.rb, line 17644
    def then_keyword
      then_keyword_loc&.slice
    end

def `then_keyword`: () -> `String`?

then_keyword_loc ()
Source

    # File lib/prism/node.rb, line 17585
    def then_keyword_loc
      location = @then_keyword_loc
      case location
      when nil
        nil
      when Location
        location
      else
        @then_keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
      end
    end

The location of the ‘then` keyword, if present.

    unless cond then bar end
                ^^^^

type ()
Source

    # File lib/prism/node.rb, line 17659
    def type
      :unless_node
    end

Return a symbol representation of this node type. See ‘Node#type`.