--- /dev/null
+``escape``
+==========
+
+.. versionadded:: 1.9.0
+ The ``css``, ``url``, and ``html_attr`` strategies were added in Twig
+ 1.9.0.
+
+.. versionadded:: 1.14.0
+ The ability to define custom escapers was added in Twig 1.14.0.
+
+The ``escape`` filter escapes a string for safe insertion into the final
+output. It supports different escaping strategies depending on the template
+context.
+
+By default, it uses the HTML escaping strategy:
+
+.. code-block:: jinja
+
+ {{ user.username|escape }}
+
+For convenience, the ``e`` filter is defined as an alias:
+
+.. code-block:: jinja
+
+ {{ user.username|e }}
+
+The ``escape`` filter can also be used in other contexts than HTML thanks to
+an optional argument which defines the escaping strategy to use:
+
+.. code-block:: jinja
+
+ {{ user.username|e }}
+ {# is equivalent to #}
+ {{ user.username|e('html') }}
+
+And here is how to escape variables included in JavaScript code:
+
+.. code-block:: jinja
+
+ {{ user.username|escape('js') }}
+ {{ user.username|e('js') }}
+
+The ``escape`` filter supports the following escaping strategies:
+
+* ``html``: escapes a string for the **HTML body** context.
+
+* ``js``: escapes a string for the **JavaScript context**.
+
+* ``css``: escapes a string for the **CSS context**. CSS escaping can be
+ applied to any string being inserted into CSS and escapes everything except
+ alphanumerics.
+
+* ``url``: escapes a string for the **URI or parameter contexts**. This should
+ not be used to escape an entire URI; only a subcomponent being inserted.
+
+* ``html_attr``: escapes a string for the **HTML attribute** context.
+
+.. note::
+
+ Internally, ``escape`` uses the PHP native `htmlspecialchars`_ function
+ for the HTML escaping strategy.
+
+.. caution::
+
+ When using automatic escaping, Twig tries to not double-escape a variable
+ when the automatic escaping strategy is the same as the one applied by the
+ escape filter; but that does not work when using a variable as the
+ escaping strategy:
+
+ .. code-block:: jinja
+
+ {% set strategy = 'html' %}
+
+ {% autoescape 'html' %}
+ {{ var|escape('html') }} {# won't be double-escaped #}
+ {{ var|escape(strategy) }} {# will be double-escaped #}
+ {% endautoescape %}
+
+ When using a variable as the escaping strategy, you should disable
+ automatic escaping:
+
+ .. code-block:: jinja
+
+ {% set strategy = 'html' %}
+
+ {% autoescape 'html' %}
+ {{ var|escape(strategy)|raw }} {# won't be double-escaped #}
+ {% endautoescape %}
+
+Custom Escapers
+---------------
+
+You can define custom escapers by calling the ``setEscaper()`` method on the
+``core`` extension instance. The first argument is the escaper name (to be
+used in the ``escape`` call) and the second one must be a valid PHP callable:
+
+.. code-block:: php
+
+ $twig = new Twig_Environment($loader);
+ $twig->getExtension('Twig_Extension_Core')->setEscaper('csv', 'csv_escaper');
+
+ // before Twig 1.26
+ $twig->getExtension('core')->setEscaper('csv', 'csv_escaper');
+
+When called by Twig, the callable receives the Twig environment instance, the
+string to escape, and the charset.
+
+.. note::
+
+ Built-in escapers cannot be overridden mainly they should be considered as
+ the final implementation and also for better performance.
+
+Arguments
+---------
+
+* ``strategy``: The escaping strategy
+* ``charset``: The string charset
+
+.. _`htmlspecialchars`: http://php.net/htmlspecialchars