Represents the use of the ‘alias` keyword to alias a global variable.
alias $foo $bar ^^^^^^^^^^^^^^^
Represents the new name of the global variable that can be used after aliasing. This can be either a global variable, a back reference, or a numbered reference.
alias $foo $bar
^^^^
Represents the old name of the global variable that could be used before aliasing. This can be either a global variable, a back reference, or a numbered reference.
alias $foo $bar
^^^^
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 178
def initialize(source, new_name, old_name, keyword_loc, location)
@source = source
@location = location
@new_name = new_name
@old_name = old_name
@keyword_loc = keyword_loc
end
def initialize: (Prism::node new_name, Prism::node old_name, Location keyword_loc, Location location) -> void
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 275
def self.type
:alias_global_variable_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-3.4.0-preview1/lib/prism/node.rb, line 281
def ===(other)
other.is_a?(AliasGlobalVariableNode) &&
(new_name === other.new_name) &&
(old_name === other.old_name) &&
(keyword_loc.nil? == other.keyword_loc.nil?)
end
Implements case-equality for the node. This is effectively == but without comparing the value of locations. Locations are checked only for presence.
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 187
def accept(visitor)
visitor.visit_alias_global_variable_node(self)
end
def accept: (Visitor visitor) -> void
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 192
def child_nodes
[new_name, old_name]
end
def child_nodes: () -> Array[nil | Node]
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 202
def comment_targets
[new_name, old_name, keyword_loc] #: Array[Prism::node | Location]
end
def comment_targets: () -> Array[Node | Location]
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 197
def compact_child_nodes
[new_name, old_name]
end
def compact_child_nodes: () -> Array
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 207
def copy(new_name: self.new_name, old_name: self.old_name, keyword_loc: self.keyword_loc, location: self.location)
AliasGlobalVariableNode.new(source, new_name, old_name, keyword_loc, location)
end
def copy: (?new_name: Prism::node, ?old_name: Prism::node, ?keyword_loc: Location, ?location: Location) -> AliasGlobalVariableNode
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 215
def deconstruct_keys(keys)
{ new_name: new_name, old_name: old_name, keyword_loc: keyword_loc, location: location }
end
def deconstruct_keys: (Array keys) -> { new_name: Prism::node, old_name: Prism::node, keyword_loc: Location, location: Location }
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 247
def inspect
InspectVisitor.compose(self)
end
def inspect -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 242
def keyword
keyword_loc.slice
end
def keyword: () -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 235
def keyword_loc
location = @keyword_loc
return location if location.is_a?(Location)
@keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
The location of the ‘alias` keyword.
alias $foo $bar ^^^^^
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 265
def type
:alias_global_variable_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