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<?php |
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namespace SilverStripe\TextExtraction\Extractor; |
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use SilverStripe\Assets\File; |
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/** |
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* Text extractor that uses php function strip_tags to get just the text. OK for indexing, not |
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* the best for readable text. |
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* |
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* @author mstephens |
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*/ |
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class HTMLTextExtractor extends FileTextExtractor |
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{ |
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/** |
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* Lower priority because its not the most clever HTML extraction. If there is something better, use it |
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* |
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* @config |
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* @var integer |
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*/ |
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private static $priority = 10; |
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/** |
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* @return boolean |
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*/ |
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public function isAvailable() |
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{ |
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return true; |
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} |
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/** |
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* @param string $extension |
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* @return array |
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*/ |
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public function supportsExtension($extension) |
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{ |
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return in_array(strtolower($extension), ["html", "htm", "xhtml"]); |
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} |
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/** |
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* @param string $mime |
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* @return string |
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*/ |
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public function supportsMime($mime) |
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{ |
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return strtolower($mime) === 'text/html'; |
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} |
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/** |
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* Extracts content from regex, by using strip_tags() |
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* combined with regular expressions to remove non-content tags like <style> or <script>, |
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* as well as adding line breaks after block tags. |
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* |
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* @param File $file |
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* @return string |
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*/ |
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public function getContent($file) |
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{ |
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$content = $file instanceof File ? $file->getString() : file_get_contents($file); |
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// Yes, yes, regex'ing HTML is evil. |
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// Since we don't care about well-formedness or markup here, it does the job. |
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$content = preg_replace( |
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[ |
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// Remove invisible content |
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'@<head[^>]*?>.*?</head>@siu', |
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'@<style[^>]*?>.*?</style>@siu', |
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'@<script[^>]*?.*?</script>@siu', |
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'@<object[^>]*?.*?</object>@siu', |
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'@<embed[^>]*?.*?</embed>@siu', |
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'@<applet[^>]*?.*?</applet>@siu', |
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'@<noframes[^>]*?.*?</noframes>@siu', |
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'@<noscript[^>]*?.*?</noscript>@siu', |
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'@<noembed[^>]*?.*?</noembed>@siu', |
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// Add line breaks before and after blocks |
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'@</?((address)|(blockquote)|(center)|(del))@iu', |
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'@</?((div)|(h[1-9])|(ins)|(isindex)|(p)|(pre))@iu', |
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'@</?((dir)|(dl)|(dt)|(dd)|(li)|(menu)|(ol)|(ul))@iu', |
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'@</?((table)|(th)|(td)|(caption))@iu', |
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'@</?((form)|(button)|(fieldset)|(legend)|(input))@iu', |
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'@</?((label)|(select)|(optgroup)|(option)|(textarea))@iu', |
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'@</?((frameset)|(frame)|(iframe))@iu', |
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], |
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[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', "$0", "$0", "$0", "$0", "$0", "$0", "$0", "$0"], |
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$content |
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); |
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return strip_tags($content); |
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} |
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} |
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silverstripe /
silverstripe-textextraction
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