class Sanitize

def initialize(config = {})
  # Sanitize configuration.
  @config = Config::DEFAULT.merge(config)
  @config[:transformers] = Array(@config[:transformers])
  # :remove_contents takes precedence over :escape_only.
  if @config[:remove_contents] && @config[:escape_only]
    @config[:escape_only] = false
  end
  # Convert the list of allowed elements to a Hash for faster lookup.
  @allowed_elements = {}
  @config[:elements].each {|el| @allowed_elements[el] = true }
  # Specific nodes to whitelist (along with all their attributes). This array
  # is generated at runtime by transformers, and is cleared before and after
  # a fragment is cleaned (so it applies only to a specific fragment).
  @whitelist_nodes = []
end