91 lines
2.8 KiB
PHP
91 lines
2.8 KiB
PHP
<?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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