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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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* |
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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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/** @var \lessc LESS compiler */ |
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protected $less; |
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/** @var array Collection of LESS variables */ |
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protected $variables = []; |
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/** @var array Collection of LESS mixins */ |
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protected $mixins = []; |
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/** @var string Cached LESS code */ |
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protected $lessCode; |
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/** SamsonFramework load preparation stage handler */ |
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public function prepare() |
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{ |
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Event::subscribe(Router::E_RESOURCE_COMPILE, [$this, 'compiler']); |
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$this->less = new \lessc; |
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return true; |
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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'][$i]); |
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} |
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// Replace path in LESS @import command with recursive call to this function |
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$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 $content Compiled output resource content |
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* |
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* @throws \Exception |
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*/ |
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public function compiler($resource, &$extension, &$content) |
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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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} 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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1 |
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} |
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} |
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SamsonPHP /
less
