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<?php |
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/** |
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* HtmlProcessor.php |
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* |
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* @package Embera |
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* @author Michael Pratt <[email protected]> |
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* @link http://www.michael-pratt.com/ |
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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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*/ |
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namespace Embera; |
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/** |
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* This Class is in charge of replacing content, ignoring specific |
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* html tags. |
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*/ |
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class HtmlProcessor |
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{ |
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/** @var array with tags that should be ignored */ |
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protected $tags = array(); |
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/** @var array With url to html conversion code */ |
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protected $replacementTable = array(); |
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/** @var array with placeholders to be reserved/restored */ |
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protected $holder = array(); |
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/** |
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* Constructor |
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* |
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* @param array $tags The tags that should be ignored |
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* @param array $replacementTable Array with the conversions that should be made |
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* Normally in the url -> html mode. |
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* @return void |
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*/ |
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public function __construct(array $tags, array $replacementTable) |
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{ |
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$this->replacementTable = $replacementTable; |
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$this->tags = $tags; |
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} |
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/** |
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* Process the content and does the replacements |
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* |
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* @param string $content |
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* @return string |
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*/ |
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public function process($content) |
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{ |
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foreach ($this->tags as $t) { |
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$content = $this->reserveTag($content, $t); |
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} |
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$content = strtr($content, $this->replacementTable); |
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return $this->restoreHolders($content); |
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} |
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/** |
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* Reserves a tag, which in this case, all it does is replace the html tag |
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* with a placeholder. |
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* |
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* @param string $content |
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* @param string $tag |
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* @return string |
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*/ |
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protected function reserveTag($content, $tag) |
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{ |
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if (stripos($content, '<' . $tag) !== false) { |
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if (in_array(strtolower($tag), array('img'))) { |
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$pattern = '~(<' . preg_quote($tag, '~') . '[^>]+\>)~i'; |
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} else { |
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$pattern = '~(<' . preg_quote($tag, '~') . '\\b[^>]*?>[\\s\\S]*?<\\/' . preg_quote($tag, '~') . '>)~i'; |
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} |
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return preg_replace_callback($pattern, array($this, 'placeHolder'), $content); |
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} |
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return $content; |
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} |
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/** |
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* Assigns a placeholder to the matched content. Its used by preg_replace_callback |
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* |
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* @param array $matches |
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* @return string |
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*/ |
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protected function placeHolder(array $matches) |
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{ |
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$placeholder = '%{{' . md5(time() . count($this->holder) . mt_rand(0, 500)) . '}}%'; |
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$this->holder[$placeholder] = $matches['1']; |
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return $placeholder; |
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} |
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/** |
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* Restores all the dummy placeholders with the original content |
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* |
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* @param string $content |
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* @return string |
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*/ |
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protected function restoreHolders($content) |
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{ |
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if (!empty($this->holder)) { |
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/** |
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* Now the question that you might be asking yourself is, why use a 'for' loop instead |
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* of the plain 'str_replace' function once? |
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* |
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* Well, since html can be nested, there might be cases were a placeholder was placed inside |
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* another placeholder and if we do just one 'str_replace', we might not get the full original |
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* content. |
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* |
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* In order to ensure that no data is lost, we need to run 'str_replace' for each time a tag |
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* was registered in the constructor. That is the worst case scenario, most of the times, the loop |
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* is just going to run once and repeat the cycle only if there are signs that another placeholder is in |
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* the content. |
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*/ |
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for ($i=0; $i < count($this->tags); $i++) { |
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$content = str_replace(array_keys($this->holder), array_values($this->holder), $content); |
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if (strpos($content, '%{{') === false) { |
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break; |
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} |
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} |
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} |
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return $content; |
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} |
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} |
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?> |
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mpratt /
Embera
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Adding a
@returnannotation to a constructor is not recommended, since a constructor does not have a meaningful return value.Please refer to the PHP core documentation on constructors.