chriseppstein/compass

module Compass::Util
  extend self

  def compass_warn(*args)
    Sass::Util.sass_warn(*args)
  end

  def blank?(value)
    case value
    when NilClass, FalseClass
      true
    when String, Array
      value.length.zero?
    else
      false
    end
  end

  def assert_valid_keys(hash, *keys)
    keys = keys.inject([]) {|m, k| m << k; m << k.to_s if k.is_a?(Symbol); m}
    invalid_keys = hash.keys - keys
    if invalid_keys.any?
      raise ArgumentError, "Invalid key#{'s' if invalid_keys.size > 1} found: #{invalid_keys.map{|k| k.inspect}.sort.join(", ")}"
    end
  end

  def symbolize_keys!(hash)
    hash.keys.select {|k| k.is_a?(String)}.each do |k|
      hash[k.to_sym] = hash.delete(k)
    end
    nil
  end

end