class ChefCLI::Policyfile::DSL

def validate_run_list_items(items, run_list_name = nil)
  items.each do |item|
    run_list_desc = run_list_name.nil? ? "Run List Item '#{item}'" : "Named Run List '#{run_list_name}' Item '#{item}'"
    item_name = Chef::RunList::RunListItem.new(item).name
    cookbook, separator, recipe = item_name.partition("::")
    if RUN_LIST_ITEM_COMPONENT.match(cookbook).nil?
      message = "#{run_list_desc} has invalid cookbook name '#{cookbook}'.\nCookbook names can only contain alphanumerics, hyphens, and underscores."
      # Special case when there's only one colon instead of two:
      if /[^:]:[^:]/.match?(cookbook)
        message << "\nDid you mean '#{item.sub(":", "::")}'?"
      end
      @errors << message
    end
    unless separator.empty?
      # we have a cookbook and recipe
      if RUN_LIST_ITEM_COMPONENT.match(recipe).nil?
        @errors << "#{run_list_desc} has invalid recipe name '#{recipe}'.\nRecipe names can only contain alphanumerics, hyphens, and underscores."
      end
    end
  end
end