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PhabricatorNgramsIndexEngineExtension.php
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			<?php

			final class PhabricatorNgramsIndexEngineExtension
			extends PhabricatorIndexEngineExtension {

			const EXTENSIONKEY = 'ngrams';

			public function getExtensionName() {
			return pht('Ngrams Engine');
			}

			public function getIndexVersion($object) {
			$ngrams = $object->newNgrams();
			$map = mpull($ngrams, 'getValue', 'getNgramKey');
			ksort($map);
			$serialized = serialize($map);

			return PhabricatorHash::digestForIndex($serialized);
			}

			public function shouldIndexObject($object) {
			return ($object instanceof PhabricatorNgramsInterface);
			}

			public function indexObject(
			PhabricatorIndexEngine $engine,
			$object) {

			foreach ($object->newNgrams() as $ngram) {
			$ngram->writeNgram($object->getID());
			}
			}

			}