PhutilRemarkupHighlightRule.php
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	<?php

	final class PhutilRemarkupHighlightRule extends PhutilRemarkupRule {

	public function getPriority() {
	return 1000.0;
	}

	public function apply($text) {
	if ($this->getEngine()->isTextMode()) {
	return $text;
	}

	return $this->replaceHTML(
	'@!!(.+?)(!{2,})@',
	array($this, 'applyCallback'),
	$text);
	}

	protected function applyCallback(array $matches) {
	// Remove the two exclamation points that represent syntax.
	$excitement = substr($matches[2], 2);

	// $excitement now has two fewer !'s than we started with.
	return hsprintf('<span class="remarkup-highlight">%s%s</span>',
	$matches[1], $excitement);

	}

	}