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<?php |
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namespace Jerodev\Diglett; |
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use Jerodev\Diglett\CssFilters\ICssFilter; |
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use Jerodev\Diglett\Models\ParsedSelector; |
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class CssFilterParser |
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{ |
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/** |
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* The css filters to parse. |
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* |
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* @var array |
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*/ |
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private $cssFilters; |
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/** |
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* Create CssFilterParser and set the chosen css filters. |
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* |
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* @param array $cssFilters An array of css filters to use |
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*/ |
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public function __construct(array $cssFilters = []) |
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{ |
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$this->cssFilters = []; |
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$this->addCssFilters([ |
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CssFilters\ContainsTextFilter::class, |
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CssFilters\ExactTextFilter::class, |
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CssFilters\FirstFilter::class, |
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CssFilters\LastFilter::class, |
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CssFilters\NextFilter::class, |
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CssFilters\NthFilter::class, |
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CssFilters\PrevFilter::class, |
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CssFilters\RegexTextFilter::class, |
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]); |
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if (!empty($cssFilters)) { |
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$this->addCssFilters($cssFilters); |
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} |
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} |
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/** |
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* Add extra css filters. |
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* |
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* @param array|string $cssFilter |
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*/ |
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public function addCssFilters($cssFilter): void |
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{ |
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if (is_array($cssFilter)) { |
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foreach ($cssFilter as $filter) { |
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$this->addCssFilters($filter); |
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} |
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} else { |
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if (!class_exists($cssFilter) || !in_array(ICssFilter::class, class_implements($cssFilter))) { |
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throw new \ErrorException("`$cssFilter` does not implement ICssFilter."); |
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} |
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$this->cssFilters[$cssFilter::getFunctionName()] = $cssFilter; |
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} |
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} |
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/** |
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* Parse a string to an array containing selectors and special functions. |
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* |
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* @param string $line The filter to parser |
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* |
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* @return array |
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*/ |
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public function parse(string $line): array |
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{ |
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$line = trim($line); |
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$parts = []; |
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$selector = null; |
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$functions = []; |
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for ($i = 0; $i < strlen($line); $i++) { |
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$char = $line[$i]; |
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if (empty(trim($char)) && empty(trim($selector))) { |
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continue; |
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} |
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if ($char !== ':') { |
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$selector .= $char; |
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} else { |
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do { |
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$brackets = 0; |
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$functionLine = ''; |
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for (; ++$i < strlen($line);) { |
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$char = $line[$i]; |
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$functionLine .= $char; |
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if ($char === '(') { |
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$brackets++; |
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} elseif ($char === ')' && --$brackets === 0) { |
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break; |
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} |
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} |
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$functions[] = $this->parseFunctionString($functionLine); |
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} while (++$i < strlen($line) && $line[$i] === ':'); |
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$parts[] = new ParsedSelector($selector, $functions); |
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$selector = null; |
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$functions = []; |
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} |
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} |
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if (!empty(trim($selector)) || !empty($functions)) { |
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$parts[] = new ParsedSelector($selector, $functions); |
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} |
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return $parts; |
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} |
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/** |
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* Parse a string to a CssFilter object. |
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* |
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* @param string $line The part of the selector presenting the filter function |
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*/ |
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private function parseFunctionString(string $line): ICssFilter |
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{ |
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if (!preg_match('/^([^\(]+)\((.*?)\)$/', $line, $matches)) { |
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throw new \ErrorException("`$line` is not a valid function string."); |
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} |
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$functionName = $matches[1]; |
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if (!array_key_exists($functionName, $this->cssFilters)) { |
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throw new \ErrorException("The ICssFilter `$functionName` does not exist."); |
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} |
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return new $this->cssFilters[$functionName](preg_split('/,/', $matches[2])); |
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} |
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} |
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jerodev /
diglett
