class SyntaxTree::DefNode


def object.method(param) result end
def method(param) result end
Def represents defining a regular method on the current self object.

def ===(other) 

def ===(other)
  other.is_a?(DefNode) && target === other.target &&
    operator === other.operator && name === other.name &&
    params === other.params && bodystmt === other.bodystmt
end

def accept(visitor) 

def accept(visitor)
  visitor.visit_def(self)
end

def arity 

def arity
  params = self.params
  case params
  when Params
    params.arity
  when Paren
    params.contents.arity
  else
    0..0
  end
end

def child_nodes 

def child_nodes
  [target, operator, name, params, bodystmt]
end

def copy( 

def copy(
  target: nil,
  operator: nil,
  name: nil,
  params: nil,
  bodystmt: nil,
  location: nil
)
  node =
    DefNode.new(
      target: target || self.target,
      operator: operator || self.operator,
      name: name || self.name,
      params: params || self.params,
      bodystmt: bodystmt || self.bodystmt,
      location: location || self.location
    )
  node.comments.concat(comments.map(&:copy))
  node
end

def deconstruct_keys(_keys) 

def deconstruct_keys(_keys)
  {
    target: target,
    operator: operator,
    name: name,
    params: params,
    bodystmt: bodystmt,
    location: location,
    comments: comments
  }
end

def endless?

method name and parameters.
i.e. where the method body is defined using the `=` operator after the
Returns true if the method was found in the source in the "endless" form, 
def endless?
  !bodystmt.is_a?(BodyStmt)
end

def format(q) 

def format(q)
  params = self.params
  bodystmt = self.bodystmt
  q.group do
    q.group do
      q.text("def")
      q.text(" ") if target || name.comments.empty?
      if target
        q.format(target)
        q.format(CallOperatorFormatter.new(operator), stackable: false)
      end
      q.format(name)
      case params
      when Paren
        q.format(params)
      when Params
        q.format(params) if !params.empty? || params.comments.any?
      end
    end
    if endless?
      q.text(" =")
      q.group do
        q.indent do
          q.breakable_space
          q.format(bodystmt)
        end
      end
    else
      unless bodystmt.empty?
        q.indent do
          q.breakable_force
          q.format(bodystmt)
        end
      end
      q.breakable_force
      q.text("end")
    end
  end
end

def initialize(target:, operator:, name:, params:, bodystmt:, location:) 

def initialize(target:, operator:, name:, params:, bodystmt:, location:)
  @target = target
  @operator = operator
  @name = name
  @params = params
  @bodystmt = bodystmt
  @location = location
  @comments = []
end