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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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class CssFilterParser { |
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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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$this->addCssFilters([ |
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CssFilters\FirstFilter::class, |
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CssFilters\NthFilter::class |
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]); |
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if (!empty($cssFilters)) |
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{ |
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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($cssFilter)) |
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{ |
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foreach ($cssFilter as $filter) |
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{ |
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$this->addCssFilters($filter); |
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} |
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} |
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else |
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{ |
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if (!class_exists($cssFilter) || !in_array(ICssFilter::class, class_implements($cssFilter))) |
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throw new \ErrorException("`$cssFilter` does not implement ICssFilter."); |
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$this->cssFilters[$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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* @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); $i++) |
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{ |
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$char = $line[$i]; |
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if (empty(trim($char)) && empty(trim($selector))) |
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continue; |
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if ($char !== ':') |
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{ |
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$selector .= $char; |
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} |
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else |
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{ |
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do |
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{ |
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$brackets = 0; |
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$functionLine = ''; |
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for (;++$i < strlen($line);) |
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{ |
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$char = $line[$i]; |
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$functionLine .= $char; |
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if ($char === '(') |
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{ |
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$brackets++; |
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} |
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elseif ($char === ')' && --$brackets === 0) |
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{ |
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break; |
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} |
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} |
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$functions[] = $this->parseFunctionString($functionLine); |
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} |
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while (++$i < strlen($line) && $line[$i] === ':'); |
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$parts[] = ['selector' => $selector, 'functions' => $functions]; |
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$selector = null; |
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$functions = []; |
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} |
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} |
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if (!empty(trim($selector))) |
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$parts[] = ['selector' => $selector, 'functions' => $functions]; |
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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, $matches)) |
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{ |
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throw new \ErrorException("`$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, $this->cssFilters)) |
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{ |
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throw new \ErrorException("The ICssFilter `$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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} |
jerodev /
diglett
