{% set describedby = ((field.id ~ '-error') if error else None, (field.id ~ '-help') if field.help_text else None) | select | join(' ') %}
<div class="{% if error %}{{ field.error_class }}{% endif %}">
    {% if input_group_prepend or input_group_append %}
        <div class="input-group {% if input_group_flat %}input-group-flat{% endif %} {% if error %}has-validation{% endif %}">
            {% if input_group_prepend %}<span class="input-group-text">{{ input_group_prepend }}</span>{% endif %}
            <input id="{{ field.id }}"
                   name="{{ field.id }}"
                   class="{{ field.class_ }} {% if error %}{{ field.error_class }}{% endif %}"
                   value="{{ '' if data is none else data }}"
                   {% if error %}aria-invalid="true"{% endif %}
                   {% if describedby %}aria-describedby="{{ describedby }}"{% endif %}
                   {{ field.input_params() | safe }} />
            {% if input_group_append %}<span class="input-group-text">{{ input_group_append }}</span>{% endif %}
        </div>
    {% else %}
        <input id="{{ field.id }}"
               name="{{ field.id }}"
               class="{{ field.class_ }} {% if error %}{{ field.error_class }}{% endif %}"
               value="{{ '' if data is none else data }}"
               {% if error %}aria-invalid="true"{% endif %}
               {% if describedby %}aria-describedby="{{ describedby }}"{% endif %}
               {{ field.input_params() | safe }} />
    {% endif %}
    {% if field.help_text %}<small class="form-hint" id="{{ field.id }}-help">{{ field.help_text }}</small>{% endif %}
</div>
{% include "fields/form/_error.html" %}