class Prism::ConstantPathTargetNode

Represents writing to a constant path in a context that doesn’t have an explicit value.

Foo::Foo, Bar::Bar = baz
^^^^^^^^  ^^^^^^^^

Attributes

child[R]

attr_reader child: ConstantReadNode | MissingNode

parent[R]

attr_reader parent: Prism::node?

Public Class Methods

new(source, parent, child, delimiter_loc, location) click to toggle source

def initialize: (Prism::node? parent, ConstantReadNode | MissingNode child, Location delimiter_loc, Location location) -> void

# File lib/prism/node.rb, line 5234
def initialize(source, parent, child, delimiter_loc, location)
  @source = source
  @newline = false
  @location = location
  @parent = parent
  @child = child
  @delimiter_loc = delimiter_loc
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 5326
def self.type
  :constant_path_target_node
end

Public Instance Methods

===(other) click to toggle source

Implements case-equality for the node. This is effectively == but without comparing the value of locations. Locations are checked only for presence.

# File lib/prism/node.rb, line 5332
def ===(other)
  other.is_a?(ConstantPathTargetNode) &&
    (parent === other.parent) &&
    (child === other.child) &&
    (delimiter_loc.nil? == other.delimiter_loc.nil?)
end

accept(visitor) click to toggle source

def accept: (Visitor visitor) -> void

# File lib/prism/node.rb, line 5244
def accept(visitor)
  visitor.visit_constant_path_target_node(self)
end

child_nodes() click to toggle source

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

# File lib/prism/node.rb, line 5249
def child_nodes
  [parent, child]
end

Also aliased as: deconstruct

comment_targets() click to toggle source

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

# File lib/prism/node.rb, line 5262
def comment_targets
  [*parent, child, delimiter_loc] #: Array[Prism::node | Location]
end

compact_child_nodes() click to toggle source

def compact_child_nodes: () -> Array

# File lib/prism/node.rb, line 5254
def compact_child_nodes
  compact = [] #: Array[Prism::node]
  compact << parent if parent
  compact << child
  compact
end

copy(parent: self.parent, child: self.child, delimiter_loc: self.delimiter_loc, location: self.location) click to toggle source

def copy: (?parent: Prism::node?, ?child: ConstantReadNode | MissingNode, ?delimiter_loc: Location, ?location: Location) -> ConstantPathTargetNode

# File lib/prism/node.rb, line 5267
def copy(parent: self.parent, child: self.child, delimiter_loc: self.delimiter_loc, location: self.location)
  ConstantPathTargetNode.new(source, parent, child, delimiter_loc, location)
end

deconstruct()

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

Alias for: child_nodes

deconstruct_keys(keys) click to toggle source

def deconstruct_keys: (Array keys) -> { parent: Prism::node?, child: ConstantReadNode | MissingNode, delimiter_loc: Location, location: Location }

# File lib/prism/node.rb, line 5275
def deconstruct_keys(keys)
  { parent: parent, child: child, delimiter_loc: delimiter_loc, location: location }
end

delimiter() click to toggle source

def delimiter: () -> String

# File lib/prism/node.rb, line 5293
def delimiter
  delimiter_loc.slice
end

delimiter_loc() click to toggle source

attr_reader delimiter_loc: Location

# File lib/prism/node.rb, line 5286
def delimiter_loc
  location = @delimiter_loc
  return location if location.is_a?(Location)
  @delimiter_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end

full_name() click to toggle source

Returns the full name of this constant path. For example: “Foo::Bar”

# File lib/prism/node_ext.rb, line 190
def full_name
  full_name_parts.join("::")
end

full_name_parts() click to toggle source

Returns the list of parts for the full name of this constant path. For example: [:Foo, :Bar]

# File lib/prism/node_ext.rb, line 170
def full_name_parts
  parts =
    case parent
    when ConstantPathNode, ConstantReadNode
      parent.full_name_parts
    when nil
      [:""]
    else
      # e.g. self::Foo, (var)::Bar = baz
      raise ConstantPathNode::DynamicPartsInConstantPathError, "Constant target path contains dynamic parts. Cannot compute full name"
    end

  if child.is_a?(MissingNode)
    raise ConstantPathNode::MissingNodesInConstantPathError, "Constant target path contains missing nodes. Cannot compute full name"
  end

  parts.push(child.name)
end

inspect() click to toggle source

def inspect -> String

# File lib/prism/node.rb, line 5298
def inspect
  InspectVisitor.compose(self)
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 5316
def type
  :constant_path_target_node
end