{% macro formatted_list(
  items,
  conjunction='and',
  before_each='‘',
  after_each='’',
  separator=', ',
  prefix='',
  prefix_plural=''
) %}
  {% if items|length == 1 %}
    {{ prefix }} {{ before_each|safe }}{{ (items|list)[0] }}{{ after_each|safe }}
  {% elif items %}
    {{ prefix_plural }}
    {% for item in (items|list)[0:-1] -%}
      {{ before_each|safe -}}
      {{ item -}}
      {{ after_each|safe -}}
      {% if not loop.last -%}
        {{ separator -}}
      {% endif -%}
    {% endfor %}
    {{ conjunction }}
    {{ before_each|safe -}}
    {{ (items|list)[-1] -}}
    {{ after_each|safe }}
  {%- endif %}
{%- endmacro %}


{% macro list_of_placeholders(placeholders) %}
  {{ formatted_list(
    placeholders,
    before_each="<span class='placeholder'>((",
    after_each='))</span>',
    separator=' '
  ) }}
{%- endmacro %}