class TomlRB::Keyvalue

def accept_visitor(parser)
  parser.visit_keyvalue self
end

def assign(hash, fully_defined_keys, symbolize_keys = false)
  @symbolize_keys = symbolize_keys
  dotted_keys_str = @dotted_keys.join(".")
  keys = symbolize_keys ? @dotted_keys.map(&:to_sym) : @dotted_keys
  update = keys.reverse.inject(visit_value(@value)) { |k1, k2| {k2 => k1} }
  if @value.is_a?(InlineTable)
    fully_defined_keys << dotted_keys_str
    hash.merge!(update) { |key, _, _| fail ValueOverwriteError.new(key) }
  elsif fully_defined_keys.find { |k| update.dig(*k) }
    hash.merge!(update) { |key, _, _| fail ValueOverwriteError.new(key) }
  else
    dotted_key_merge(hash, update)
  end
end

def dotted_key_merge(hash, update)
  hash.merge!(update) { |key, old, new|
    if old.is_a?(Hash) && new.is_a?(Hash)
      dotted_key_merge(old, new)
    else
      fail ValueOverwriteError.new(key)
    end
  }
end

def initialize(dotted_keys, value)
  @dotted_keys = dotted_keys
  @value = value
  @symbolize_keys = false
end

def visit_value(a_value)
  return a_value unless a_value.respond_to? :accept_visitor
  a_value.accept_visitor self
end