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<?php |
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/** |
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* This file is part of the sauls/helpers package. |
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* |
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* @author Saulius Vaičeliūnas <[email protected]> |
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* @link http://saulius.vaiceliunas.lt |
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* @copyright 2018 |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Sauls\Component\Helper\Operation\StringOperation; |
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class TruncateHtml implements TruncateHtmlInterface |
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{ |
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private $truncateOperation; |
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private $truncateOperationMethod = 'truncate'; |
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private $truncateOperationMethods = [ |
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self::TRUNCATE_HTML_LETTER, |
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self::TRUNCATE_HTML_WORD, |
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self::TRUNCATE_HTML_SENTENCE, |
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]; |
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private $encoding = 'utf-8'; |
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private $truncateWordsOperation; |
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private $truncateSentencesOperation; |
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/** |
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* @var CountWordsInterface |
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*/ |
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private $countWordsOperation; |
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/** |
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* @var CountSentencesInterface |
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*/ |
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private $countSentencesOperation; |
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private $openTokens = []; |
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private $totalCount = 0; |
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private $depth = 0; |
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private $truncated = []; |
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public function __construct( |
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TruncateInterface $truncateOperation, |
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TruncateWordsInterface $truncateWordsOperation, |
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TruncateSentencesInterface $truncateSentencesOperation, |
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CountWordsInterface $countWordsOperation, |
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CountSentencesInterface $countSentencesOperation |
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) { |
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$this->truncateOperation = $truncateOperation; |
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$this->truncateWordsOperation = $truncateWordsOperation; |
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$this->truncateSentencesOperation = $truncateSentencesOperation; |
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$this->countWordsOperation = $countWordsOperation; |
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$this->countSentencesOperation = $countSentencesOperation; |
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} |
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public function execute(string $value, int $length, string $suffix = '...'): string |
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{ |
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$this->resetVariables(); |
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$config = \HTMLPurifier_Config::create(null); |
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$lexer = \HTMLPurifier_Lexer::create($config); |
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$tokens = $lexer->tokenizeHTML($value, $config, new \HTMLPurifier_Context()); |
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$this->processTokens($tokens, $length, $suffix); |
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$context = new \HTMLPurifier_Context(); |
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$generator = new \HTMLPurifier_Generator($config, $context); |
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return $generator->generateFromTokens($this->truncated).($this->totalCount >= $length ? $suffix : ''); |
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} |
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private function resetVariables(): void |
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{ |
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$this->openTokens = []; |
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$this->depth = 0; |
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$this->totalCount = 0; |
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$this->truncated = []; |
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} |
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private function processTokens(array $tokens, int $length, string $suffix): void |
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{ |
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foreach ($tokens as $token) { |
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$this->processTokenStart($token); |
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$this->processTokenText($token, $length, $suffix); |
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$this->processTokenEnd($token); |
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$this->processTokenEmpty($token); |
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if ($this->totalCount >= $length) { |
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$this->processOpenTokens(); |
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break; |
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} |
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} |
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} |
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private function processTokenStart($token): void |
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{ |
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if ($token instanceof \HTMLPurifier_Token_Start) { |
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$this->openTokens[$this->depth] = $token->name; |
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$this->truncated[] = $token; |
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++$this->depth; |
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} |
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} |
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private function processTokenText($token, int $length, string $suffix): void |
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{ |
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if ($token instanceof \HTMLPurifier_Token_Text && $this->totalCount <= $length) { |
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$currentLength = $this->truncateByMethod($token->data, $length - $this->totalCount, $suffix); |
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$this->totalCount += $currentLength; |
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$this->truncated[] = $token; |
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} |
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} |
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private function truncateByMethod(string &$value, int $length, string $suffix): int |
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{ |
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return $this->{$this->truncateOperationMethod}($value, $length, $suffix); |
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} |
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private function processTokenEnd($token): void |
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{ |
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if ($token instanceof \HTMLPurifier_Token_End) { |
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if ($token->name === $this->openTokens[$this->depth - 1]) { |
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--$this->depth; |
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unset($this->openTokens[$this->depth]); |
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$this->truncated[] = $token; |
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} |
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} |
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} |
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private function processTokenEmpty($token) |
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{ |
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if ($token instanceof \HTMLPurifier_Token_Empty) { |
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$this->truncated[] = $token; |
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} |
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} |
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private function processOpenTokens(): void |
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{ |
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if (0 < \count($this->openTokens)) { |
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\krsort($this->openTokens); |
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foreach ($this->openTokens as $name) { |
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$this->truncated[] = new \HTMLPurifier_Token_End($name); |
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} |
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} |
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} |
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/** |
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* @param string $truncateOperationMethod |
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* |
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* @return TruncateHtml |
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*/ |
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public function setTruncateOperationMethod(string $truncateOperationMethod): void |
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{ |
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if (!in_array($truncateOperationMethod, $this->truncateOperationMethods)) { |
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throw new \InvalidArgumentException(\sprintf('`%s` truncate operation method is not supported.', |
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$truncateOperationMethod)); |
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} |
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$this->truncateOperationMethod = $truncateOperationMethod; |
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} |
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private function truncate(string &$value, int $length, string $suffix): int |
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{ |
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$value = $this->truncateOperation->execute($value, $length, $suffix); |
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return \mb_strlen($value, $this->encoding); |
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} |
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private function truncateWords(string &$value, int $count, string $suffix): int |
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{ |
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$value = $this->truncateWordsOperation->execute($value, $count, $suffix); |
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return $this->countWordsOperation->execute($value); |
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} |
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private function truncateSentences(string &$value, int $count, string $suffix): int |
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{ |
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$value = $this->truncateSentencesOperation->execute($value, $count, $suffix); |
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return $this->countSentencesOperation->execute($value); |
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} |
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} |
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sauls /
helpers
