app.request.get('_route')
is probably what you are looking for:
{% if app.request.get('_route') == 'current_route' %}
<a href="{{ path('current_route') }}" class="YouAreHere">My Link</a>
{% else %}
<a href="{{ path('some_other_route') }}">My Link</a>
{% endif %}
In case you want to use uri instead, you can use app.request.uri
.
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