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<?php |
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/** |
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* @copyright Copyright (c) 2016, ownCloud, Inc. |
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* |
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* @author Joas Schilling <[email protected]> |
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* @author Robin Appelman <[email protected]> |
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* @author Roeland Jago Douma <[email protected]> |
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* |
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* @license AGPL-3.0 |
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* |
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* This code is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License, version 3, |
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* as published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License, version 3, |
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* along with this program. If not, see <http://www.gnu.org/licenses/> |
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* |
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*/ |
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namespace OC\Preview; |
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use OCP\Files\File; |
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use OCP\IImage; |
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class MarkDown extends TXT { |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getMimeType(): string { |
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return '/text\/(x-)?markdown/'; |
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} |
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public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage { |
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$content = $file->fopen('r'); |
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if ($content === false) { |
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return null; |
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} |
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$content = stream_get_contents($content,3000); |
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//don't create previews of empty text files |
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if (trim($content) === '') { |
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return null; |
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} |
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// Merge text paragraph lines that might belong together |
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$content = preg_replace('/^(\s*)\*\s/mU', '$1- ', $content); |
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$content = preg_replace('/((?!^(\s*-|#)).*)(\w|\\|\.)(\r\n|\n|\r)(\w|\*)/mU', '$1 $3', $content); |
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// Remove markdown symbols that we cannot easily represent in rendered text in the preview |
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$content = preg_replace('/\*\*(.*)\*\*/U', '$1', $content); |
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$content = preg_replace('/\*(.*)\*/U', '$1', $content); |
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$content = preg_replace('/\_\_(.*)\_\_/U', '$1', $content); |
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$content = preg_replace('/\_(.*)\_/U', '$1', $content); |
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$content = preg_replace('/\~\~(.*)\~\~/U', '$1', $content); |
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$content = preg_replace('/\!?\[((.|\n)*)\]\((.*)\)/mU', '$1 ($3)', $content); |
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$content = preg_replace('/\n\n+/', "\n", $content); |
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$content = preg_replace('/[\x{10000}-\x{10FFFF}]/u', '', $content); |
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$lines = preg_split("/\r\n|\n|\r/", $content); |
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// Define text size of text file preview |
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$fontSize = $maxX ? (int) ((1 / ($maxX >= 512 ? 60 : 40) * $maxX)) : 10; |
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$image = imagecreate($maxX, $maxY); |
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imagecolorallocate($image, 255, 255, 255); |
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$textColor = imagecolorallocate($image, 0, 0, 0); |
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$fontFile = __DIR__ . '/../../../core/fonts/NotoSans-Regular.ttf'; |
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$fontFileBold = __DIR__ . '/../../../core/fonts/NotoSans-Bold.ttf'; |
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$canUseTTF = function_exists('imagettftext'); |
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$textOffset = (int)min($maxX * 0.05, $maxY * 0.05); |
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$nextLineStart = 0; |
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$y = $textOffset; |
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foreach ($lines as $line) { |
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$actualFontSize = $fontSize; |
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if (mb_strpos($line, '# ') === 0) { |
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$actualFontSize *= 2; |
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} |
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if (mb_strpos($line, '## ') === 0) { |
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$actualFontSize *= 1.8; |
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} |
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if (mb_strpos($line, '### ') === 0) { |
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$actualFontSize *= 1.6; |
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} |
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if (mb_strpos($line, '#### ') === 0) { |
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$actualFontSize *= 1.4; |
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} |
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if (mb_strpos($line, '##### ') === 0) { |
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$actualFontSize *= 1.2; |
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} |
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if (mb_strpos($line, '###### ') === 0) { |
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$actualFontSize *= 1.1; |
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} |
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// Add spacing before headlines |
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if ($actualFontSize !== $fontSize && $y !== $textOffset) { |
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$y += (int)($actualFontSize * 2); |
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} |
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$x = $textOffset; |
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$y += (int)($nextLineStart + $actualFontSize); |
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if ($canUseTTF === true) { |
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$wordWrap = (int)((1 / $actualFontSize * 1.3) * $maxX); |
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// Get rid of markdown symbols that we still needed for the font size |
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$line = preg_replace('/^#*\s/', '', $line); |
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$wrappedText = wordwrap($line, $wordWrap,"\n"); |
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$linesWrapped = count(explode("\n", $wrappedText)); |
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imagettftext($image, $actualFontSize, 0, $x, $y, $textColor, $actualFontSize === $fontSize ? $fontFile : $fontFileBold, $wrappedText); |
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$nextLineStart = (int)($linesWrapped * ceil($actualFontSize * 2)); |
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if ($actualFontSize !== $fontSize && $y !== $textOffset) { |
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$nextLineStart -= $actualFontSize; |
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} |
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} else { |
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$y -= (int)$fontSize; |
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imagestring($image, 1, $x, $y, $line, $textColor); |
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$nextLineStart = $fontSize; |
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} |
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if ($y >= $maxY) { |
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break; |
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} |
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} |
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$imageObject = new \OC_Image(); |
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$imageObject->setResource($image); |
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return $imageObject->valid() ? $imageObject : null; |
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} |
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} |
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nextcloud /
server
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