Represents a hash pattern in pattern matching.
foo => { a: 1, b: 2 }
^^^^^^^^^^^^^^
foo => { a: 1, b: 2, **c }
^^^^^^^^^^^^^^^^^^^
attr_reader opening_loc: Location?
attr_reader closing_loc: Location?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 7593
def initialize(constant, elements, rest, opening_loc, closing_loc, location)
@constant = constant
@elements = elements
@rest = rest
@opening_loc = opening_loc
@closing_loc = closing_loc
@location = location
end
def initialize: (constant: Node?, elements: Array, rest: Node?, opening_loc: Location?, closing_loc: Location?, location: Location) -> void
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 7701
def self.type
:hash_pattern_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 7603
def accept(visitor)
visitor.visit_hash_pattern_node(self)
end
def accept: (visitor: Visitor) -> void
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 7608
def child_nodes
[constant, *elements, rest]
end
def child_nodes: () -> Array[nil | Node]
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 7652
def closing
closing_loc&.slice
end
def closing: () -> String?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 7622
def comment_targets
[*constant, *elements, *rest, *opening_loc, *closing_loc]
end
def comment_targets: () -> Array[Node | Location]
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 7613
def compact_child_nodes
compact = []
compact << constant if constant
compact.concat(elements)
compact << rest if rest
compact
end
def compact_child_nodes: () -> Array
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 7627
def copy(**params)
HashPatternNode.new(
params.fetch(:constant) { constant },
params.fetch(:elements) { elements },
params.fetch(:rest) { rest },
params.fetch(:opening_loc) { opening_loc },
params.fetch(:closing_loc) { closing_loc },
params.fetch(:location) { location },
)
end
def copy: (**params) -> HashPatternNode
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 7642
def deconstruct_keys(keys)
{ constant: constant, elements: elements, rest: rest, opening_loc: opening_loc, closing_loc: closing_loc, location: location }
end
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 7657
def inspect(inspector = NodeInspector.new)
inspector << inspector.header(self)
if (constant = self.constant).nil?
inspector << "├── constant: ∅\n"
else
inspector << "├── constant:\n"
inspector << constant.inspect(inspector.child_inspector("│ ")).delete_prefix(inspector.prefix)
end
inspector << "├── elements: #{inspector.list("#{inspector.prefix}│ ", elements)}"
if (rest = self.rest).nil?
inspector << "├── rest: ∅\n"
else
inspector << "├── rest:\n"
inspector << rest.inspect(inspector.child_inspector("│ ")).delete_prefix(inspector.prefix)
end
inspector << "├── opening_loc: #{inspector.location(opening_loc)}\n"
inspector << "└── closing_loc: #{inspector.location(closing_loc)}\n"
inspector.to_str
end
def inspect(inspector: NodeInspector) -> String
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 7647
def opening
opening_loc&.slice
end
def opening: () -> String?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 7691
def type
:hash_pattern_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