class Prism::RescueNode
Represents a rescue statement.
begin rescue Foo, *splat, Bar => ex foo ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ end
‘Foo, *splat, Bar` are in the `exceptions` field. `ex` is in the `exception` field.
Attributes
attr_reader consequent: RescueNode
?
attr_reader exceptions: Array
attr_reader reference: Prism::node?
attr_reader statements: StatementsNode
?
Public Class Methods
def initialize: (Location
keyword_loc
, Array exceptions, Location
? operator_loc
, Prism::node? reference, StatementsNode
? statements, RescueNode
? consequent, Location
location) -> void
# File prism/node.rb, line 16111 def initialize(source, keyword_loc, exceptions, operator_loc, reference, statements, consequent, location) @source = source @location = location @keyword_loc = keyword_loc @exceptions = exceptions @operator_loc = operator_loc @reference = reference @statements = statements @consequent = consequent 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 16231 def self.type :rescue_node end
Public Instance Methods
Implements case-equality for the node. This is effectively == but without comparing the value of locations. Locations are checked only for presence.
# File prism/node.rb, line 16237 def ===(other) other.is_a?(RescueNode) && (keyword_loc.nil? == other.keyword_loc.nil?) && (exceptions.length == other.exceptions.length) && exceptions.zip(other.exceptions).all? { |left, right| left === right } && (operator_loc.nil? == other.operator_loc.nil?) && (reference === other.reference) && (statements === other.statements) && (consequent === other.consequent) end
def accept: (Visitor
visitor) -> void
# File prism/node.rb, line 16123 def accept(visitor) visitor.visit_rescue_node(self) end
def child_nodes
: () -> Array[nil | Node]
# File prism/node.rb, line 16128 def child_nodes [*exceptions, reference, statements, consequent] end
def comment_targets
: () -> Array[Node | Location]
# File prism/node.rb, line 16143 def comment_targets [keyword_loc, *exceptions, *operator_loc, *reference, *statements, *consequent] #: Array[Prism::node | Location] end
def compact_child_nodes
: () -> Array
# File prism/node.rb, line 16133 def compact_child_nodes compact = [] #: Array[Prism::node] compact.concat(exceptions) compact << reference if reference compact << statements if statements compact << consequent if consequent compact end
def copy: (?keyword_loc: Location
, ?exceptions: Array, ?operator_loc: Location
?, ?reference: Prism::node?, ?statements: StatementsNode
?, ?consequent: RescueNode
?, ?location: Location
) -> RescueNode
# File prism/node.rb, line 16148 def copy(keyword_loc: self.keyword_loc, exceptions: self.exceptions, operator_loc: self.operator_loc, reference: self.reference, statements: self.statements, consequent: self.consequent, location: self.location) RescueNode.new(source, keyword_loc, exceptions, operator_loc, reference, statements, consequent, location) end
def deconstruct_keys
: (Array keys) -> { keyword_loc
: Location
, exceptions: Array, operator_loc
: Location
?, reference: Prism::node?, statements: StatementsNode
?, consequent: RescueNode
?, location: Location
}
# File prism/node.rb, line 16156 def deconstruct_keys(keys) { keyword_loc: keyword_loc, exceptions: exceptions, operator_loc: operator_loc, reference: reference, statements: statements, consequent: consequent, location: location } end
def inspect -> String
# File prism/node.rb, line 16203 def inspect InspectVisitor.compose(self) end
def keyword: () -> String
# File prism/node.rb, line 16193 def keyword keyword_loc.slice end
attr_reader keyword_loc
: Location
# File prism/node.rb, line 16161 def keyword_loc location = @keyword_loc return location if location.is_a?(Location) @keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF) end
def operator: () -> String?
# File prism/node.rb, line 16198 def operator operator_loc&.slice end
attr_reader operator_loc
: Location
?
# File prism/node.rb, line 16171 def operator_loc location = @operator_loc case location when nil nil when Location location else @operator_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF) end 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 16221 def type :rescue_node end