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PhabricatorFerretSearchEngineExtension.php
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			<?php

			final class PhabricatorFerretSearchEngineExtension
			extends PhabricatorSearchEngineExtension {

			const EXTENSIONKEY = 'ferret';

			public function isExtensionEnabled() {
			return true;
			}

			public function getExtensionName() {
			return pht('Fulltext Search');
			}

			public function getExtensionOrder() {
			return 1000;
			}

			public function supportsObject($object) {
			return ($object instanceof PhabricatorFerretInterface);
			}

			public function applyConstraintsToQuery(
			$object,
			$query,
			PhabricatorSavedQuery $saved,
			array $map) {

			if (!(isset($map['query']) && strlen($map['query']))) {
			return;
			}

			$engine = $object->newFerretEngine();

			$raw_query = $map['query'];

			$compiler = id(new PhutilSearchQueryCompiler())
			->setEnableFunctions(true);

			$raw_tokens = $compiler->newTokens($raw_query);

			$fulltext_tokens = array();
			foreach ($raw_tokens as $raw_token) {
			$fulltext_token = id(new PhabricatorFulltextToken())
			->setToken($raw_token);

			$fulltext_tokens[] = $fulltext_token;
			}

			$query->withFerretConstraint($engine, $fulltext_tokens);
			}

			public function getSearchFields($object) {
			$fields = array();

			$fields[] = id(new PhabricatorSearchTextField())
			->setKey('query')
			->setLabel(pht('Query'))
			->setDescription(
			pht(
			'Find objects matching a fulltext search query. See '.
			'"Search User Guide" in the documentation for details.'));

			return $fields;
			}

			public function getSearchAttachments($object) {
			return array();
			}


			}