Processes CSS file and adds base URLs to any relative resource paths.

Parameters

array $css_asset: A CSS asset. The array should contain the `data` key where the value should be the path to the CSS file relative to the Drupal root. This is an example of the `data` key's value, "core/assets/vendor/normalize-css/normalize.css".

Return value

string The asset's cleaned/optimized contents.

1 call to CssOptimizer::processFile()

CssOptimizer::optimize in core/lib/Drupal/Core/Asset/CssOptimizer.php

Optimizes an asset.

File

core/lib/Drupal/Core/Asset/CssOptimizer.php, line 85

Class

CssOptimizer

Optimizes a CSS asset.

Namespace

Drupal\Core\Asset

Code

protected function processFile($css_asset) {
  $contents = $this->loadFile($css_asset['data'], TRUE);
  $contents = $this->clean($contents);
  // Get the parent directory of this file, relative to the Drupal root.
  $css_base_path = substr($css_asset['data'], 0, strrpos($css_asset['data'], '/'));
  // Store base path.
  $this->rewriteFileURIBasePath = $css_base_path . '/';
  // Anchor all paths in the CSS with its base URL, ignoring external and absolute paths.
  return preg_replace_callback('/url\\(\\s*[\'"]?(?![a-z]+:|\\/+)([^\'")]+)[\'"]?\\s*\\)/i', [
    $this,
    'rewriteFileURI',
  ], $contents);
}

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