class Prism::ParametersNode

def self.type
  :parameters_node
end

def ===(other)
  other.is_a?(ParametersNode) &&
    (requireds.length == other.requireds.length) &&
    requireds.zip(other.requireds).all? { |left, right| left === right } &&
    (optionals.length == other.optionals.length) &&
    optionals.zip(other.optionals).all? { |left, right| left === right } &&
    (rest === other.rest) &&
    (posts.length == other.posts.length) &&
    posts.zip(other.posts).all? { |left, right| left === right } &&
    (keywords.length == other.keywords.length) &&
    keywords.zip(other.keywords).all? { |left, right| left === right } &&
    (keyword_rest === other.keyword_rest) &&
    (block === other.block)
end

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

def child_nodes
  [*requireds, *optionals, rest, *posts, *keywords, keyword_rest, block]
end

def comment_targets
  [*requireds, *optionals, *rest, *posts, *keywords, *keyword_rest, *block] #: Array[Prism::node | Location]
end

def compact_child_nodes
  compact = [] #: Array[Prism::node]
  compact.concat(requireds)
  compact.concat(optionals)
  compact << rest if rest
  compact.concat(posts)
  compact.concat(keywords)
  compact << keyword_rest if keyword_rest
  compact << block if block
  compact
end

def copy(node_id: self.node_id, location: self.location, flags: self.flags, requireds: self.requireds, optionals: self.optionals, rest: self.rest, posts: self.posts, keywords: self.keywords, keyword_rest: self.keyword_rest, block: self.block)
  ParametersNode.new(source, node_id, location, flags, requireds, optionals, rest, posts, keywords, keyword_rest, block)
end

def deconstruct_keys(keys)
  { node_id: node_id, location: location, requireds: requireds, optionals: optionals, rest: rest, posts: posts, keywords: keywords, keyword_rest: keyword_rest, block: block }
end

def initialize(source, node_id, location, flags, requireds, optionals, rest, posts, keywords, keyword_rest, block)
  @source = source
  @node_id = node_id
  @location = location
  @flags = flags
  @requireds = requireds
  @optionals = optionals
  @rest = rest
  @posts = posts
  @keywords = keywords
  @keyword_rest = keyword_rest
  @block = block
end

def inspect
  InspectVisitor.compose(self)
end

def signature
  names = [] #: Array[[Symbol, Symbol] | [Symbol]]
  requireds.each do |param|
    names << (param.is_a?(MultiTargetNode) ? [:req] : [:req, param.name])
  end
  optionals.each { |param| names << [:opt, param.name] }
  if rest && rest.is_a?(RestParameterNode)
    names << [:rest, rest.name || :*]
  end
  posts.each do |param|
    case param
    when MultiTargetNode
      names << [:req]
    when NoKeywordsParameterNode, KeywordRestParameterNode, ForwardingParameterNode
      # Invalid syntax, e.g. "def f(**nil, ...)" moves the NoKeywordsParameterNode to posts
      raise "Invalid syntax"
    else
      names << [:req, param.name]
    end
  end
  # Regardless of the order in which the keywords were defined, the required
  # keywords always come first followed by the optional keywords.
  keyopt = [] #: Array[OptionalKeywordParameterNode]
  keywords.each do |param|
    if param.is_a?(OptionalKeywordParameterNode)
      keyopt << param
    else
      names << [:keyreq, param.name]
    end
  end
  keyopt.each { |param| names << [:key, param.name] }
  case keyword_rest
  when ForwardingParameterNode
    names.concat([[:rest, :*], [:keyrest, :**], [:block, :&]])
  when KeywordRestParameterNode
    names << [:keyrest, keyword_rest.name || :**]
  when NoKeywordsParameterNode
    names << [:nokey]
  end
  names << [:block, block.name || :&] if block
  names
end

def type
  :parameters_node
end