class Prism::AliasMethodNode
Represents the use of the ‘alias` keyword to alias a method.
alias foo bar ^^^^^^^^^^^^^
Attributes
attr_reader keyword_loc
: Location
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 prism/node.rb, line 253 def self.type :alias_method_node end
Public Instance Methods
def accept: (visitor: Visitor
) -> void
# File prism/node.rb, line 176 def accept(visitor) visitor.visit_alias_method_node(self) end
def child_nodes
: () -> Array[nil | Node]
# File prism/node.rb, line 181 def child_nodes [new_name, old_name] end
def comment_targets
: () -> Array[Node | Location]
# File prism/node.rb, line 191 def comment_targets [new_name, old_name, keyword_loc] end
def compact_child_nodes
: () -> Array
# File prism/node.rb, line 186 def compact_child_nodes [new_name, old_name] end
def copy: (**params) -> AliasMethodNode
# File prism/node.rb, line 196 def copy(**params) AliasMethodNode.new( params.fetch(:new_name) { new_name }, params.fetch(:old_name) { old_name }, params.fetch(:keyword_loc) { keyword_loc }, params.fetch(:location) { location }, ) end
def inspect(inspector: NodeInspector) -> String
# File prism/node.rb, line 219 def inspect(inspector = NodeInspector.new) inspector << inspector.header(self) inspector << "├── new_name:\n" inspector << inspector.child_node(new_name, "│ ") inspector << "├── old_name:\n" inspector << inspector.child_node(old_name, "│ ") inspector << "└── keyword_loc: #{inspector.location(keyword_loc)}\n" inspector.to_str end
def keyword: () -> String
# File prism/node.rb, line 214 def keyword keyword_loc.slice 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 prism/node.rb, line 243 def type :alias_method_node end