class Prism::KeywordHashNode
Represents a hash literal without opening and closing braces.
foo(a: b) ^^^^
Attributes
attr_reader elements: Array[AssocNode | AssocSplatNode]
private attr_reader flags: Integer
Public Class Methods
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 lib/prism/node.rb, line 11429 def self.type :keyword_hash_node end
Public Instance Methods
def accept: (Visitor
visitor) -> void
# File lib/prism/node.rb, line 11351 def accept(visitor) visitor.visit_keyword_hash_node(self) end
def child_nodes
: () -> Array[nil | Node]
# File lib/prism/node.rb, line 11356 def child_nodes [*elements] end
def comment_targets
: () -> Array[Node | Location]
# File lib/prism/node.rb, line 11366 def comment_targets [*elements] #: Array[Prism::node | Location] end
def compact_child_nodes
: () -> Array
# File lib/prism/node.rb, line 11361 def compact_child_nodes [*elements] end
def copy: (?flags: Integer
, ?elements: Array[AssocNode | AssocSplatNode], ?location: Location
) -> KeywordHashNode
# File lib/prism/node.rb, line 11371 def copy(flags: self.flags, elements: self.elements, location: self.location) KeywordHashNode.new(source, flags, elements, location) end
def deconstruct_keys
: (Array keys) -> { flags: Integer
, elements: Array[AssocNode | AssocSplatNode], location: Location
}
# File lib/prism/node.rb, line 11379 def deconstruct_keys(keys) { flags: flags, elements: elements, location: location } end
def inspect(NodeInspector inspector) -> String
# File lib/prism/node.rb, line 11397 def inspect(inspector = NodeInspector.new) inspector << inspector.header(self) flags = [("symbol_keys" if symbol_keys?)].compact inspector << "├── flags: #{flags.empty? ? "∅" : flags.join(", ")}\n" inspector << "└── elements: #{inspector.list("#{inspector.prefix} ", elements)}" inspector.to_str end
def symbol_keys?: () -> bool
# File lib/prism/node.rb, line 11392 def symbol_keys? flags.anybits?(KeywordHashNodeFlags::SYMBOL_KEYS) 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
# File lib/prism/node.rb, line 11419 def type :keyword_hash_node end