A class that is able to parse the content of the flash messenger service in an HTML format. It uses the TemplateInterface to parse a partial, sending to the partial template the messages, the service and the renderer itself. There are also a twig extension provided in dot-twigrenderer, for easy parsing of messages blocks.
Partial template example:
{% set classes = {'error': 'danger', 'info': 'info', 'warning': 'warning', 'success' : 'success'} %}
{% if dismissible is not defined %}
{% set dismissible = false %}
{% endif %}
{% if messages is defined and messages is iterable %}
{% for namespace in messages|keys %}
{% if classes[namespace] is defined %}
<div class="alert alert-{{ classes[namespace] }} {% if dismissible %}alert-dismissible{% endif %}"
role="alert">
{% if dismissible %}
<button type="button" class="close" data-dismiss="alert" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
{% endif %}
<ul>
{% for message in messages[namespace] %}
{% set writeMessage = message|raw %}
<li>{% trans writeMessage %}</li>
{% endfor %}
</ul>
</div>
{% endif %}
{% endfor %}
{% endif %}