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

consequent[R]

attr_reader consequent: RescueNode?

exceptions[R]

attr_reader exceptions: Array

keyword_loc[R]

attr_reader keyword_loc: Location

operator_loc[R]

attr_reader operator_loc: Location?

reference[R]

attr_reader reference: Node?

statements[R]

attr_reader statements: StatementsNode?

Public Class Methods

new(keyword_loc, exceptions, operator_loc, reference, statements, consequent, location) click to toggle source

def initialize: (keyword_loc: Location, exceptions: Array, operator_loc: Location?, reference: Node?, statements: StatementsNode?, consequent: RescueNode?, location: Location) -> void

# File lib/prism/node.rb, line 14784
def initialize(keyword_loc, exceptions, operator_loc, reference, statements, consequent, location)
  @keyword_loc = keyword_loc
  @exceptions = exceptions
  @operator_loc = operator_loc
  @reference = reference
  @statements = statements
  @consequent = consequent
  @location = location
end

type() click to toggle source

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 14901
def self.type
  :rescue_node
end

Public Instance Methods

accept(visitor) click to toggle source

def accept: (visitor: Visitor) -> void

# File lib/prism/node.rb, line 14795
def accept(visitor)
  visitor.visit_rescue_node(self)
end

child_nodes() click to toggle source

def child_nodes: () -> Array[nil | Node]

# File lib/prism/node.rb, line 14800
def child_nodes
  [*exceptions, reference, statements, consequent]
end

Also aliased as: deconstruct

comment_targets() click to toggle source

def comment_targets: () -> Array[Node | Location]

# File lib/prism/node.rb, line 14815
def comment_targets
  [keyword_loc, *exceptions, *operator_loc, *reference, *statements, *consequent]
end

compact_child_nodes() click to toggle source

def compact_child_nodes: () -> Array

# File lib/prism/node.rb, line 14805
def compact_child_nodes
  compact = []
  compact.concat(exceptions)
  compact << reference if reference
  compact << statements if statements
  compact << consequent if consequent
  compact
end

copy(**params) click to toggle source

def copy: (**params) -> RescueNode

# File lib/prism/node.rb, line 14820
def copy(**params)
  RescueNode.new(
    params.fetch(:keyword_loc) { keyword_loc },
    params.fetch(:exceptions) { exceptions },
    params.fetch(:operator_loc) { operator_loc },
    params.fetch(:reference) { reference },
    params.fetch(:statements) { statements },
    params.fetch(:consequent) { consequent },
    params.fetch(:location) { location },
  )
end

deconstruct()

def deconstruct: () -> Array[nil | Node]

Alias for: child_nodes

deconstruct_keys(keys) click to toggle source

# File lib/prism/node.rb, line 14836
def deconstruct_keys(keys)
  { keyword_loc: keyword_loc, exceptions: exceptions, operator_loc: operator_loc, reference: reference, statements: statements, consequent: consequent, location: location }
end

inspect(inspector = NodeInspector.new) click to toggle source

def inspect(inspector: NodeInspector) -> String

# File lib/prism/node.rb, line 14851
def inspect(inspector = NodeInspector.new)
  inspector << inspector.header(self)
  inspector << "├── keyword_loc: #{inspector.location(keyword_loc)}\n"
  inspector << "├── exceptions: #{inspector.list("#{inspector.prefix}│   ", exceptions)}"
  inspector << "├── operator_loc: #{inspector.location(operator_loc)}\n"
  if (reference = self.reference).nil?
    inspector << "├── reference: ∅\n"
  else
    inspector << "├── reference:\n"
    inspector << reference.inspect(inspector.child_inspector("│   ")).delete_prefix(inspector.prefix)
  end
  if (statements = self.statements).nil?
    inspector << "├── statements: ∅\n"
  else
    inspector << "├── statements:\n"
    inspector << statements.inspect(inspector.child_inspector("│   ")).delete_prefix(inspector.prefix)
  end
  if (consequent = self.consequent).nil?
    inspector << "└── consequent: ∅\n"
  else
    inspector << "└── consequent:\n"
    inspector << consequent.inspect(inspector.child_inspector("    ")).delete_prefix(inspector.prefix)
  end
  inspector.to_str
end

keyword() click to toggle source

def keyword: () -> String

# File lib/prism/node.rb, line 14841
def keyword
  keyword_loc.slice
end

operator() click to toggle source

def operator: () -> String?

# File lib/prism/node.rb, line 14846
def operator
  operator_loc&.slice
end

type() click to toggle source

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 14891
def type
  :rescue_node
end