How to Apply an Assetic Filter to a Specific File Extension
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How to Apply an Assetic Filter to a Specific File Extension
Assetic filters can be applied to individual files, groups of files or even, as you'll see here, files that have a specific extension. To show you how to handle each option, let's suppose that you want to use Assetic's CoffeeScript filter, which compiles CoffeeScript files into Javascript.
The main configuration is just the paths to coffee and node. These default
respectively to /usr/bin/coffee
and /usr/bin/node
:
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# app/config/config.yml
assetic:
filters:
coffee:
bin: /usr/bin/coffee
node: /usr/bin/node
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<!-- app/config/config.xml -->
<assetic:config>
<assetic:filter
name="coffee"
bin="/usr/bin/coffee"
node="/usr/bin/node" />
</assetic:config>
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// app/config/config.php
$container->loadFromExtension('assetic', array(
'filters' => array(
'coffee' => array(
'bin' => '/usr/bin/coffee',
'node' => '/usr/bin/node',
),
),
));
Filter a Single File
You can now serve up a single CoffeeScript file as JavaScript from within your templates:
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{% javascripts '@AcmeFooBundle/Resources/public/js/example.coffee' filter='coffee' %}
<script src="{{ asset_url }}" type="text/javascript"></script>
{% endjavascripts %}
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<?php foreach ($view['assetic']->javascripts(
array('@AcmeFooBundle/Resources/public/js/example.coffee'),
array('coffee')
) as $url): ?>
<script src="<?php echo $view->escape($url) ?>" type="text/javascript"></script>
<?php endforeach; ?>
This is all that's needed to compile this CoffeeScript file and server it as the compiled JavaScript.
Filter Multiple Files
You can also combine multiple CoffeeScript files into a single output file:
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{% javascripts '@AcmeFooBundle/Resources/public/js/example.coffee'
'@AcmeFooBundle/Resources/public/js/another.coffee'
filter='coffee' %}
<script src="{{ asset_url }}" type="text/javascript"></script>
{% endjavascripts %}
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<?php foreach ($view['assetic']->javascripts(
array(
'@AcmeFooBundle/Resources/public/js/example.coffee',
'@AcmeFooBundle/Resources/public/js/another.coffee',
),
array('coffee')
) as $url): ?>
<script src="<?php echo $view->escape($url) ?>" type="text/javascript"></script>
<?php endforeach; ?>
Both the files will now be served up as a single file compiled into regular JavaScript.
Filtering based on a File Extension
One of the great advantages of using Assetic is reducing the number of asset files to lower HTTP requests. In order to make full use of this, it would be good to combine all your JavaScript and CoffeeScript files together since they will ultimately all be served as JavaScript. Unfortunately just adding the JavaScript files to the files to be combined as above will not work as the regular JavaScript files will not survive the CoffeeScript compilation.
This problem can be avoided by using the apply_to
option in the config,
which allows you to specify that a filter should always be applied to particular
file extensions. In this case you can specify that the Coffee filter is
applied to all .coffee
files:
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# app/config/config.yml
assetic:
filters:
coffee:
bin: /usr/bin/coffee
node: /usr/bin/node
apply_to: "\.coffee$"
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<!-- app/config/config.xml -->
<assetic:config>
<assetic:filter
name="coffee"
bin="/usr/bin/coffee"
node="/usr/bin/node"
apply_to="\.coffee$" />
</assetic:config>
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// app/config/config.php
$container->loadFromExtension('assetic', array(
'filters' => array(
'coffee' => array(
'bin' => '/usr/bin/coffee',
'node' => '/usr/bin/node',
'apply_to' => '\.coffee$',
),
),
));
With this, you no longer need to specify the coffee
filter in the template.
You can also list regular JavaScript files, all of which will be combined
and rendered as a single JavaScript file (with only the .coffee
files
being run through the CoffeeScript filter):
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{% javascripts '@AcmeFooBundle/Resources/public/js/example.coffee'
'@AcmeFooBundle/Resources/public/js/another.coffee'
'@AcmeFooBundle/Resources/public/js/regular.js' %}
<script src="{{ asset_url }}" type="text/javascript"></script>
{% endjavascripts %}
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<?php foreach ($view['assetic']->javascripts(
array(
'@AcmeFooBundle/Resources/public/js/example.coffee',
'@AcmeFooBundle/Resources/public/js/another.coffee',
'@AcmeFooBundle/Resources/public/js/regular.js',
)
) as $url): ?>
<script src="<?php echo $view->escape($url) ?>" type="text/javascript"></script>
<?php endforeach; ?>