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Coding Standards
================
When writing Twig templates, we recommend you to follow these official coding
standards:
* Put one (and only one) space after the start of a delimiter (``{{``, ``{%``,
and ``{#``) and before the end of a delimiter (``}}``, ``%}``, and ``#}``):
.. code-block:: jinja
{{ foo }}
{# comment #}
{% if foo %}{% endif %}
When using the whitespace control character, do not put any spaces between
it and the delimiter:
.. code-block:: jinja
{{- foo -}}
{#- comment -#}
{%- if foo -%}{%- endif -%}
* Put one (and only one) space before and after the following operators:
comparison operators (``==``, ``!=``, ``<``, ``>``, ``>=``, ``<=``), math
operators (``+``, ``-``, ``/``, ``*``, ``%``, ``//``, ``**``), logic
operators (``not``, ``and``, ``or``), ``~``, ``is``, ``in``, and the ternary
operator (``?:``):
.. code-block:: jinja
{{ 1 + 2 }}
{{ foo ~ bar }}
{{ true ? true : false }}
* Put one (and only one) space after the ``:`` sign in hashes and ``,`` in
arrays and hashes:
.. code-block:: jinja
{{ [1, 2, 3] }}
{{ {'foo': 'bar'} }}
* Do not put any spaces after an opening parenthesis and before a closing
parenthesis in expressions:
.. code-block:: jinja
{{ 1 + (2 * 3) }}
* Do not put any spaces before and after string delimiters:
.. code-block:: jinja
{{ 'foo' }}
{{ "foo" }}
* Do not put any spaces before and after the following operators: ``|``,
``.``, ``..``, ``[]``:
.. code-block:: jinja
{{ foo|upper|lower }}
{{ user.name }}
{{ user[name] }}
{% for i in 1..12 %}{% endfor %}
* Do not put any spaces before and after the parenthesis used for filter and
function calls:
.. code-block:: jinja
{{ foo|default('foo') }}
{{ range(1..10) }}
* Do not put any spaces before and after the opening and the closing of arrays
and hashes:
.. code-block:: jinja
{{ [1, 2, 3] }}
{{ {'foo': 'bar'} }}
* Use lower cased and underscored variable names:
.. code-block:: jinja
{% set foo = 'foo' %}
{% set foo_bar = 'foo' %}
* Indent your code inside tags (use the same indentation as the one used for
the target language of the rendered template):
.. code-block:: jinja
{% block foo %}
{% if true %}
true
{% endif %}
{% endblock %}