Represents the use of the ‘in` keyword in a case statement.
case a; in b then c end
^^^^^^^^^^^
attr_reader statements: StatementsNode?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 8144
def initialize(pattern, statements, in_loc, then_loc, location)
@pattern = pattern
@statements = statements
@in_loc = in_loc
@then_loc = then_loc
@location = location
end
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 8244
def self.type
:in_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 8153
def accept(visitor)
visitor.visit_in_node(self)
end
def accept: (visitor: Visitor) -> void
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 8158
def child_nodes
[pattern, statements]
end
def child_nodes: () -> Array[nil | Node]
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 8171
def comment_targets
[pattern, *statements, in_loc, *then_loc]
end
def comment_targets: () -> Array[Node | Location]
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 8163
def compact_child_nodes
compact = []
compact << pattern
compact << statements if statements
compact
end
def compact_child_nodes: () -> Array
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 8176
def copy(**params)
InNode.new(
params.fetch(:pattern) { pattern },
params.fetch(:statements) { statements },
params.fetch(:in_loc) { in_loc },
params.fetch(:then_loc) { then_loc },
params.fetch(:location) { location },
)
end
def copy: (**params) -> InNode
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 8190
def deconstruct_keys(keys)
{ pattern: pattern, statements: statements, in_loc: in_loc, then_loc: then_loc, location: location }
end
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 8195
def in
in_loc.slice
end
def in: () -> String
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 8205
def inspect(inspector = NodeInspector.new)
inspector << inspector.header(self)
inspector << "├── pattern:\n"
inspector << inspector.child_node(pattern, "│ ")
if (statements = self.statements).nil?
inspector << "├── statements: ∅\n"
else
inspector << "├── statements:\n"
inspector << statements.inspect(inspector.child_inspector("│ ")).delete_prefix(inspector.prefix)
end
inspector << "├── in_loc: #{inspector.location(in_loc)}\n"
inspector << "└── then_loc: #{inspector.location(then_loc)}\n"
inspector.to_str
end
def inspect(inspector: NodeInspector) -> String
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 8200
def then
then_loc&.slice
end
def then: () -> String?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 8234
def type
:in_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