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PhutilSyntaxHighlighterEngine.php
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			<?php

			abstract class PhutilSyntaxHighlighterEngine extends Phobject {

			abstract public function setConfig($key, $value);
			abstract public function getHighlightFuture($language, $source);
			abstract public function getLanguageFromFilename($filename);

			final public function highlightSource($language, $source) {
			try {
			return $this->getHighlightFuture($language, $source)->resolve();
			} catch (PhutilSyntaxHighlighterException $ex) {
			return id(new PhutilDefaultSyntaxHighlighter())
			->getHighlightFuture($source)
			->resolve();
			}
			}

			}