Assetic and yui_css generating empty files

[ajfranzoia]

Hi. I'm using Assetic with yui_css and I'm having some trouble.

Assetic ver.: 1.0.1 (Commit: 3e45781 - aug 10)
yuicompressor ver: 2.4.6

config.yml

assetic:
    debug:          %kernel.debug%
    use_controller: false
    filters:
        cssrewrite: ~
        yui_css:
            jar: "%kernel.root_dir%/Resources/java/yuicompressor.jar"

config_dev.yml

assetic:
    use_controller: true

base.html.twig

{% stylesheets 'bundles/miapp/css/layout.css' filter='yui_css' %}
    <link href="{{ asset_url }}" type="text/css" rel="stylesheet" />
{% endstylesheets %}

The generated css ("XXXXXX_layout_1.css") is fetched OK by the browser, but it is empty. The file generated under web/css is empty as well.
Proccessing the css wfile ith "java -jar yuicompressor layout.css" produces the right result.

Am I missing any configuration?

[ajfranzoia]

After some hours of debugging and struggling, I´ve found that this problem is related to this PHP bug ocurring under windows: https://bugs.php.net/bug.php?id=50503. Seems it has not been fixed yet. (my os is XP 32bit, my phpinfo is available here: http://tararira.hostei.com/)

The problem is related to the proc_open function and the $env parameter.

File assetic\src\Assetic\Util\Proccess.php - Line 124

$process = proc_open($this->commandline, $descriptors, $pipes, $this->cwd, $this->env, $this->options);

It produces and empty output...
It must be changed to this to get it to work...

$process = proc_open($this->commandline, $descriptors, $pipes, $this->cwd, null, $this->options);

Apparently this isn´t harmful to modify using the yuicompressor filter because it seems it does not direct make use of the $env variable, but Compass, Less and Stylus seems to do...

Too bad there is very little information about this bug... Is there any possible workaround to this problem?

[kriswallsmith]

Please try v1.0.2.

[kriswallsmith]

I haven't heard back so I'm closing this issue. Please reopen if the issue persists.

[jakzal]

I experienced the same issue with PHP 5.3.3. It looks like it's a problem with how regular expressions work (PCRE was updated since 5.3.3). Everything works fine with PHP>=5.3.8. I didn't verify other versions.

In PHP 5.3.3 BaseCssFilter::filterUrls() and BaseCssFilter::filterImports() methods return null.