Represents a hash key/value pair.
{ a => b }
^^^^^^
attr_reader operator_loc: Location?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 855
def initialize(key, value, operator_loc, location)
@key = key
@value = value
@operator_loc = operator_loc
@location = location
end
def initialize: (key: Node, value: Node?, operator_loc: Location?, location: Location) -> void
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 947
def self.type
:assoc_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 863
def accept(visitor)
visitor.visit_assoc_node(self)
end
def accept: (visitor: Visitor) -> void
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 868
def child_nodes
[key, value]
end
def child_nodes: () -> Array[nil | Node]
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 881
def comment_targets
[key, *value, *operator_loc]
end
def comment_targets: () -> Array[Node | Location]
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 873
def compact_child_nodes
compact = []
compact << key
compact << value if value
compact
end
def compact_child_nodes: () -> Array
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 886
def copy(**params)
AssocNode.new(
params.fetch(:key) { key },
params.fetch(:value) { value },
params.fetch(:operator_loc) { operator_loc },
params.fetch(:location) { location },
)
end
def copy: (**params) -> AssocNode
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 899
def deconstruct_keys(keys)
{ key: key, value: value, operator_loc: operator_loc, location: location }
end
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 909
def inspect(inspector = NodeInspector.new)
inspector << inspector.header(self)
inspector << "├── key:\n"
inspector << inspector.child_node(key, "│ ")
if (value = self.value).nil?
inspector << "├── value: ∅\n"
else
inspector << "├── value:\n"
inspector << value.inspect(inspector.child_inspector("│ ")).delete_prefix(inspector.prefix)
end
inspector << "└── operator_loc: #{inspector.location(operator_loc)}\n"
inspector.to_str
end
def inspect(inspector: NodeInspector) -> String
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 904
def operator
operator_loc&.slice
end
def operator: () -> String?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 937
def type
:assoc_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