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Symfony 2 Twig Extension that truncates html and preserves tags stop at the end of the word
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| <?php | |
| /** | |
| * Truncate Html string without stripping tags | |
| * register in Resources/config/services.yml with: | |
| * services: | |
| * truncatehtml.twig.extension: | |
| * class: Radley\TwigExtensionBundle\Extension\TruncateHtmlExtension | |
| * tags: | |
| * - { name: twig.extension } | |
| * | |
| * Usage: | |
| * {{ htmlstring|truncatehtml(500)|raw }} | |
| */ | |
| namespace Radley\TwigExtensionBundle\Extension; | |
| class TruncateHtmlString { | |
| function __construct($string, $limit) { | |
| // create dom element using the html string | |
| $this->tempDiv = new \DomDocument(); | |
| $this->tempDiv->loadXML('<div>'.$string.'</div>'); | |
| // keep the characters count till now | |
| $this->charCount = 0; | |
| $this->encoding = 'UTF-8'; | |
| // character limit need to check | |
| $this->limit = $limit; | |
| } | |
| function cut() { | |
| // create empty document to store new html | |
| $this->newDiv = new \DomDocument(); | |
| // cut the string by parsing through each element | |
| $this->searchEnd($this->tempDiv->documentElement, $this->newDiv); | |
| $newhtml = $this->newDiv->saveHTML(); | |
| return $newhtml; | |
| } | |
| function deleteChildren($node) { | |
| while (isset($node->firstChild)) { | |
| $this->deleteChildren($node->firstChild); | |
| $node->removeChild($node->firstChild); | |
| } | |
| } | |
| function searchEnd($parseDiv, $newParent) { | |
| foreach($parseDiv->childNodes as $ele) { | |
| // not text node | |
| if($ele->nodeType != 3) { | |
| $newEle = $this->newDiv->importNode($ele, true); | |
| if(count($ele->childNodes) === 0) { | |
| $newParent->appendChild($newEle); | |
| continue; | |
| } | |
| $this->deleteChildren($newEle); | |
| $newParent->appendChild($newEle); | |
| $res = $this->searchEnd($ele, $newEle); | |
| if($res) | |
| return $res; | |
| else | |
| continue; | |
| } | |
| // the limit of the char count reached | |
| if(mb_strlen($ele->nodeValue, $this->encoding) + $this->charCount >= $this->limit) { | |
| $newEle = $this->newDiv->importNode($ele); | |
| $cutted = $this->findWordLastCharacters($newEle, $this->charCount, $this->limit); | |
| $newEle->nodeValue = substr($newEle->nodeValue, 0, $this->limit - $this->charCount + cutted); | |
| $newParent->appendChild($newEle); | |
| return true; | |
| } | |
| $newEle = $this->newDiv->importNode($ele); | |
| $newParent->appendChild($newEle); | |
| $this->charCount += mb_strlen($newEle->nodeValue, $this->encoding); | |
| } | |
| return false; | |
| } | |
| function findWordLastCharacters($element, $currentCount, $limit) { | |
| $splitted = str_split($element->nodeValue); | |
| $cutted = 0; | |
| for ($i = $limit - $currentCount; $i < count($splitted); $i++) { | |
| if($splitted[$i] == " ") break; | |
| $cutted++; | |
| } | |
| return $cutted; | |
| } | |
| } | |
| class TruncateHtmlExtension extends \Twig_Extension { | |
| public function getName() { | |
| return 'truncatehtml'; | |
| } | |
| public function getFilters() { | |
| return array('truncatehtml' => new \Twig_Filter_Method($this, 'truncatehtml')); | |
| } | |
| public function truncatehtml($html, $limit, $endchar = '…') { | |
| $output = new TruncateHtmlString($html, $limit); | |
| return $output->cut() . $endchar; | |
| } | |
| } |
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