class Prism::RescueModifierNode
Represents an expression modified with a rescue.
foo rescue nil ^^^^^^^^^^^^^^
Attributes
attr_reader expression: Node
attr_reader keyword_loc
: Location
attr_reader rescue_expression
: Node
Public Class Methods
def initialize: (expression: Node
, keyword_loc
: Location
, rescue_expression
: Node
, location: Location
) -> void
# File prism/node.rb, line 14660 def initialize(expression, keyword_loc, rescue_expression, location) @expression = expression @keyword_loc = keyword_loc @rescue_expression = rescue_expression @location = location 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 prism/node.rb, line 14749 def self.type :rescue_modifier_node end
Public Instance Methods
def accept: (visitor: Visitor
) -> void
# File prism/node.rb, line 14668 def accept(visitor) visitor.visit_rescue_modifier_node(self) end
def child_nodes
: () -> Array[nil | Node]
# File prism/node.rb, line 14677 def child_nodes [expression, rescue_expression] end
def comment_targets
: () -> Array[Node | Location]
# File prism/node.rb, line 14687 def comment_targets [expression, keyword_loc, rescue_expression] end
def compact_child_nodes
: () -> Array
# File prism/node.rb, line 14682 def compact_child_nodes [expression, rescue_expression] end
def copy: (**params) -> RescueModifierNode
# File prism/node.rb, line 14692 def copy(**params) RescueModifierNode.new( params.fetch(:expression) { expression }, params.fetch(:keyword_loc) { keyword_loc }, params.fetch(:rescue_expression) { rescue_expression }, params.fetch(:location) { location }, ) end
def inspect(inspector: NodeInspector) -> String
# File prism/node.rb, line 14715 def inspect(inspector = NodeInspector.new) inspector << inspector.header(self) inspector << "├── expression:\n" inspector << inspector.child_node(expression, "│ ") inspector << "├── keyword_loc: #{inspector.location(keyword_loc)}\n" inspector << "└── rescue_expression:\n" inspector << inspector.child_node(rescue_expression, " ") inspector.to_str end
def keyword: () -> String
# File prism/node.rb, line 14710 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 14739 def type :rescue_modifier_node end