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Editing File: /home/ubuntu/code_review/arcanist/src/ref/user/ArcanistUserSymbolRef.php

<?php

final class ArcanistUserSymbolRef
  extends ArcanistSymbolRef {

private $type;

const TYPE_ID = 'id';
  const TYPE_PHID = 'phid';
  const TYPE_USERNAME = 'username';
  const TYPE_FUNCTION = 'function';

public function getRefDisplayName() {
    return pht('User Symbol "%s"', $this->getSymbol());
  }

protected function newCacheKeyParts() {
    return array(
      sprintf('type(%s)', $this->type),
    );
  }

public function getSymbolType() {
    return $this->type;
  }

protected function resolveSymbol($symbol) {
    $matches = null;

$is_id = preg_match('/^([1-9]\d*)\z/', $symbol, $matches);
    if ($is_id) {
      $this->type = self::TYPE_ID;
      return (int)$matches[1];
    }

$is_phid = preg_match('/^PHID-USER-\S+\z/', $symbol, $matches);
    if ($is_phid) {
      $this->type = self::TYPE_PHID;
      return $matches[0];
    }

$is_function = preg_match('/^\S+\(\s*\)\s*\z/', $symbol, $matches);
    if ($is_function) {
      $this->type = self::TYPE_FUNCTION;
      return $matches[0];
    }

$is_username = preg_match('/^@?(\S+)\z/', $symbol, $matches);
    if ($is_username) {
      $this->type = self::TYPE_USERNAME;
      return $matches[1];
    }

throw new PhutilArgumentUsageException(
      pht(
        'The format of user symbol "%s" is unrecognized. Expected a '.
        'username like "alice" or "@alice", or a user PHID, or a user '.
        'ID, or a special function like "viewer()".',
        $symbol));
  }

}

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