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PhabricatorSearchTokenizerField.php
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			<?php

			abstract class PhabricatorSearchTokenizerField
			extends PhabricatorSearchField {

			protected function getDefaultValue() {
			return array();
			}

			protected function getValueFromRequest(AphrontRequest $request, $key) {
			return $this->getListFromRequest($request, $key);
			}

			public function getValueForQuery($value) {
			return $this->newDatasource()
			->setViewer($this->getViewer())
			->evaluateTokens($value);
			}

			protected function newControl() {
			return id(new AphrontFormTokenizerControl())
			->setDatasource($this->newDatasource());
			}


			abstract protected function newDatasource();


			protected function getUsersFromRequest(
			AphrontRequest $request,
			$key,
			array $allow_types = array()) {
			$list = $this->getListFromRequest($request, $key);

			$phids = array();
			$names = array();
			$allow_types = array_fuse($allow_types);
			$user_type = PhabricatorPeopleUserPHIDType::TYPECONST;
			foreach ($list as $item) {
			$type = phid_get_type($item);
			if ($type == $user_type) {
			$phids[] = $item;
			} else if (isset($allow_types[$type])) {
			$phids[] = $item;
			} else {
			if (PhabricatorTypeaheadDatasource::isFunctionToken($item)) {
			// If this is a function, pass it through unchanged; we'll evaluate
			// it later.
			$phids[] = $item;
			} else {
			$names[] = $item;
			}
			}
			}

			if ($names) {
			$users = id(new PhabricatorPeopleQuery())
			->setViewer($this->getViewer())
			->withUsernames($names)
			->execute();
			foreach ($users as $user) {
			$phids[] = $user->getPHID();
			}
			$phids = array_unique($phids);
			}

			return $phids;
			}

			}