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<?php |
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namespace samsonphp\less; |
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use samson\core\ExternalModule; |
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use samsonphp\event\Event; |
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use samsonphp\resource\exception\ResourceNotFound; |
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use samsonphp\resource\Router; |
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/** |
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* SamsonPHP LESS compiler module. |
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* TODO: Change to file operations to FileManagerInterface |
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* |
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* @author Vitaly Iegorov <[email protected]> |
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*/ |
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class Module extends ExternalModule |
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{ |
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/** LESS mixin declaration pattern */ |
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const P_IMPORT_DECLARATION = '/@import\s+(\'|\")(?<path>[^\'\"]+)(\'|\");/'; |
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/** LESS resource importing dependencies file name */ |
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const DEPENDENCY_CACHE = 'dependencies'; |
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/** @var array LESS resources dependencies */ |
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public $dependencies = []; |
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/** @var string Path to LESS resources dependencies cache file */ |
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protected $dependencyCache; |
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/** @var \lessc LESS compiler */ |
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protected $less; |
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/** SamsonFramework load preparation stage handler */ |
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public function prepare(array $params = []) |
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{ |
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$moduleCachePath = array_key_exists('cachePath', $params) ? $params['cachePath'] : $this->cache_path; |
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$this->dependencyCache = $moduleCachePath.self::DEPENDENCY_CACHE; |
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// Read previous cache file |
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if (file_exists($this->dependencyCache)) { |
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$this->dependencies = unserialize(file_get_contents($this->dependencyCache)); |
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} |
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$this->less = new \lessc; |
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Event::subscribe(Router::E_RESOURCE_COMPILE, [$this, 'compiler']); |
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Event::subscribe(Router::E_FINISHED, [$this, 'cacheDependencies']); |
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return parent::prepare(); |
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} |
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/** |
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* Cache LESS resources importing dependency trees. |
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*/ |
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public function cacheDependencies() |
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{ |
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// Create folder |
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if (!file_exists(dirname($this->dependencyCache))) { |
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@mkdir(dirname($this->dependencyCache), 0777, true); |
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} |
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file_put_contents($this->dependencyCache, serialize($this->dependencies)); |
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} |
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/** |
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* Recursively replace @import in content of the LESS file |
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* |
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* @param string $resource Resource full path |
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* @param string $content less file content |
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* |
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* @return string Content of LESS file with included @imported resources |
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* @throws ResourceNotFound If importing resource could not be found |
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*/ |
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protected function readImport($resource, $content) |
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{ |
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// Rewrite imports |
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$matches = []; |
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if (preg_match_all(self::P_IMPORT_DECLARATION, $content, $matches)) { |
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for ($i=0, $size = count($matches[0]); $i < $size; $i++) { |
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// Build absolute path to imported resource |
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$path = dirname($resource).DIRECTORY_SEPARATOR.$matches['path'][$i]; |
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// Append .less extension according to standard |
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if (false === ($path = realpath(is_file($path)?$path:$path.'.less'))) { |
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throw new ResourceNotFound('Cannot import file: '.$matches['path'][$i]); |
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} |
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// Add parent to child dependency |
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$this->dependencies[$path][$resource] = []; |
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// Replace path in LESS @import command with recursive call to this function |
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$content = str_replace($matches[0][$i], $this->readImport($path, file_get_contents($path)), $content); |
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} |
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} |
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return $content; |
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} |
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/** |
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* LESS resource compiler. |
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* |
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* @param string $resource Resource full path |
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* @param string $extension Resource extension |
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* @param string $content Compiled output resource content |
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* @param array $dependencies Collection of compiled resource dependent modules |
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* |
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* @throws \Exception |
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*/ |
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public function compiler($resource, &$extension, &$content, &$dependencies) |
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{ |
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if ($extension === 'less') { |
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try { |
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// Rewrite imports |
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$content = $this->readImport($resource, $content); |
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// Compile LESS content to CSS |
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$content = $this->less->compile($content); |
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// Switch extension |
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$extension = 'css'; |
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// Return dependencies for this resource |
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$dependencies = array_key_exists($resource, $this->dependencies) |
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? $this->dependencies[$resource] |
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: []; |
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} catch (\Exception $e) { |
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//$errorFile = 'cache/error_resourcer'.microtime(true).'.less'; |
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//file_put_contents($errorFile, $output); |
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throw new \Exception('Failed compiling LESS in "' . $resource . '":' . "\n" . $e->getMessage()); |
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} |
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} |
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} |
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} |
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SamsonPHP /
less
If you suppress an error, we recommend checking for the error condition explicitly: