Represents an ‘else` clause in a `case`, `if`, or `unless` statement.
if a then b else c end
^^^^^^^^^^
attr_reader else_keyword_loc: Location
attr_reader statements: StatementsNode?
attr_reader end_keyword_loc: Location?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 5575
def initialize(else_keyword_loc, statements, end_keyword_loc, location)
@else_keyword_loc = else_keyword_loc
@statements = statements
@end_keyword_loc = end_keyword_loc
@location = location
end
def initialize: (else_keyword_loc: Location, statements: StatementsNode?, end_keyword_loc: Location?, location: Location) -> void
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 5670
def self.type
:else_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-3.3.0/lib/prism/node.rb, line 5583
def accept(visitor)
visitor.visit_else_node(self)
end
def accept: (visitor: Visitor) -> void
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 5588
def child_nodes
[statements]
end
def child_nodes: () -> Array[nil | Node]
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 5600
def comment_targets
[else_keyword_loc, *statements, *end_keyword_loc]
end
def comment_targets: () -> Array[Node | Location]
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 5593
def compact_child_nodes
compact = []
compact << statements if statements
compact
end
def compact_child_nodes: () -> Array
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 5605
def copy(**params)
ElseNode.new(
params.fetch(:else_keyword_loc) { else_keyword_loc },
params.fetch(:statements) { statements },
params.fetch(:end_keyword_loc) { end_keyword_loc },
params.fetch(:location) { location },
)
end
def copy: (**params) -> ElseNode
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 5618
def deconstruct_keys(keys)
{ else_keyword_loc: else_keyword_loc, statements: statements, end_keyword_loc: end_keyword_loc, location: location }
end
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 5623
def else_keyword
else_keyword_loc.slice
end
def else_keyword: () -> String
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 5628
def end_keyword
end_keyword_loc&.slice
end
def end_keyword: () -> String?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 5633
def inspect(inspector = NodeInspector.new)
inspector << inspector.header(self)
inspector << "├── else_keyword_loc: #{inspector.location(else_keyword_loc)}\n"
if (statements = self.statements).nil?
inspector << "├── statements: ∅\n"
else
inspector << "├── statements:\n"
inspector << statements.inspect(inspector.child_inspector("│ ")).delete_prefix(inspector.prefix)
end
inspector << "└── end_keyword_loc: #{inspector.location(end_keyword_loc)}\n"
inspector.to_str
end
def inspect(inspector: NodeInspector) -> String
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 5660
def type
:else_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