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<?php
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/**
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* OutputFilter 'CssToHead'
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* @copyright Manuela v.d.Decken <manuela@isteam.de>
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* @author Manuela v.d.Decken <manuela@isteam.de>
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* @version 161223.3
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* @param string $content
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* @return string
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* @description step1) moves all css definitions from <body> to bottom of the <head> section
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* step2) do not move definitions which are already in <head>
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* step3) delete all css from <body>
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*/
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function doFilterCssToHead($sContent) {
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$aFilterSettings = getOutputFilterSettings();
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$key = \preg_replace('=^.*?filter([^\.\/\\\\]+)(\.[^\.]+)?$=is', '\1', __FILE__);
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if ($aFilterSettings[$key]) {}
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$aMatches = [];
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$sPattern = '/^(.*<head[^>]*>)(.*)(<\/head>.*<body[^>]*>)(.*)(<\/body>.*)$/siU';
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// 1 = .*<head..>
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// 2 = content of head
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// 3 = </head> * <body..>
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// 4 = content of body
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// 5 = </body>... end of document
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if (\preg_match($sPattern, $sContent, $aDocumentParts)) {
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unset($aDocumentParts[0]);
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$sPattern = '/(\<link[^>]*?"(text\/css|stylesheet)"[^>]*?\/?\>)|'
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. '(\<style[^>]*?"text\/css"[^>]*?\>.*?\<\/style\>)|'
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. '(\<style[^>]*?\>.*?\<\/style\>)/si';
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// search for pattern inside the <body>
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if (\preg_match_all($sPattern, $aDocumentParts[4], $aMatches)) {
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// remove duplicates from the matches and save result
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$aBodyMatches = $aMatches = \array_unique($aMatches[0]);
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// set elements to 'false' which already are in <head>
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\array_walk(
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$aMatches,
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function(&$value, $key) use (&$aDocumentParts) {
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if (\preg_match('/'.preg_quote($value, '/').'/siu', $aDocumentParts[2])) {
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$value = false;
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}
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}
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);
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// remove 'false' matches
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$aMatches = \array_filter($aMatches);
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if(\sizeof($aMatches) > 0) {
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// now attach all matches found in <body> to the <head>
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$aDocumentParts[2] .= "\n".\implode("\n", $aMatches)."\n";
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// remove the matches from <body>
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$aDocumentParts[4] = \str_replace($aBodyMatches, '', $aDocumentParts[4]);
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}
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//at least rebuild the document
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$sContent = \implode("\n", $aDocumentParts);
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}
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} else {
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throw new \Exception('malformed document created');
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}
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return $sContent;
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}
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