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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\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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* @author Nikita Kotenko <[email protected]> |
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*/ |
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class Module extends ExternalModule |
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{ |
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/** LESS variable declaration pattern */ |
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const P_VARIABLE_DECLARATION = '/^(\s|\n)?\@(?<name>[^\s:]+)\:(?<value>[^;]+);/'; |
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/** LESS mixin declaration pattern */ |
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const P_MIXIN_DECLARATION = '/^\s*\.(?<name>[^\s(]+)\s*(?<params>\([^)]+\))?\s*(?<code>\{[^}]+\})/'; |
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2 |
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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 $mixins = []; |
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/** SamsonFramework load preparation stage handler */ |
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public function prepare() |
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{ |
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Event::subscribe(Router::E_RESOURCE_PRELOAD, [$this, 'analyzer']); |
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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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* LESS resource analyzer. |
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* |
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* @param string $resource Resource full path |
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* @param string $extension Resource extension |
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*/ |
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public function analyzer($resource, $extension) |
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{ |
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if ($extension === 'less') { |
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$contents = file_get_contents($resource); |
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// Find variable declaration |
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if (preg_match_all(self::P_VARIABLE_DECLARATION, $contents, $matches)) { |
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// Gather variables in collection key => value |
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for ($i = 0, $max = count($matches['name']); $i < $max; $i++) { |
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if (!array_key_exists($matches['name'][$i], $this->variables)) { |
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$this->variables[$matches['name'][$i]] = $matches[0][$i]; |
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} |
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} |
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} |
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// Find variable declaration |
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if (preg_match_all(self::P_MIXIN_DECLARATION, $contents, $matches)) { |
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// Gather variables in collection key => value |
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for ($i = 0, $max = count($matches[0]); $i < $max; $i++) { |
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$this->mixins[$matches['name'][$i]] = $matches[0][$i]; |
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} |
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} |
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return [$this->variables, $this->mixins]; |
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} |
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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 $output Compiled output resource content |
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* |
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* @throws \Exception |
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*/ |
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public function compiler($resource, &$extension, &$output) |
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{ |
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if ($extension === 'less') { |
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try { |
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// Read updated CSS resource file and compile it with mixins |
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$output = $this->less->compile( |
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implode("\n", $this->variables) |
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. implode("\n", $this->mixins) |
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. file_get_contents($resource) |
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); |
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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[' . $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
