class Phlex::Component

def tokens(*tokens, **conditional_tokens)
  conditional_tokens.each do |condition, token|
    case condition
    when Symbol then next unless send(condition)
    when Proc then next unless condition.call
    else raise ArgumentError,
      "The class condition must be a Symbol or a Proc."
    end
    case token
    when Symbol then tokens << token.name
    when String then tokens << token
    when Array then tokens.concat(t)
    else raise ArgumentError,
      "Conditional classes must be Symbols, Strings, or Arrays of Symbols or Strings."
    end
  end
  tokens.compact.join(" ")
end