PhabricatorInlineKaTeXRemarkupRule.php
f96a14e76e1bstable

PhabricatorInlineKaTeXRemarkupRule.php
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			<?php

			final class PhabricatorInlineKaTeXRemarkupRule extends PhabricatorRemarkupCustomInlineRule {

			public function getPriority() {
			return 300.0;
			}

			public function apply($text) {
			return preg_replace_callback(
			'@{tex\b([^{}]({[^{}]?([^{}]\|(?R))[^{}]?}[^{}])[^{}]*)}@m',
			array($this, 'markupNavigation'),
			$text);
			}

			public function markupNavigation(array $matches) {

			$future = id(new ExecFuture('node /opt/render2katex/index.js i'))
			->setTimeout(15)
			->write(trim($matches[1]));

			list($err, $stdout, $stderr) = $future->resolve();

			if ($err) {
			return
			pht(
			'Execution of `%s` failed (#%d), check your syntax: %s',
			'render2katex',
			$err,
			$stderr);
			}

			$result = $stdout;
			$engine = $this->getEngine();

			if ($engine->isTextMode()) {
			return $matches[1];
			}

			if ($engine->isHTMLMailMode()) {
			return phutil_safe_html($result);
			}

			return $this->getEngine()->storeText(phutil_safe_html($result));
			}
			}