private function resolveArcRule()

in src/parser/ArcanistBaseCommitParser.php [124:193]
63 lines of code
21 McCabe index (conditional complexity)

  private function resolveArcRule($rule, $name, $source) {
    $name = $this->updateLegacyRuleName($name);

    switch ($name) {
      case 'verbose':
        $this->verbose = true;
        $this->log(pht('Enabled verbose mode.'));
        break;
      case 'prompt':
        $reason = pht('it is what you typed when prompted.');
        $this->api->setBaseCommitExplanation($reason);
        $result = phutil_console_prompt(pht('Against which commit?'));
        if (!strlen($result)) {
          // Allow the user to continue to the next rule by entering no
          // text.
          return null;
        }
        return $result;
      case 'local':
      case 'user':
      case 'project':
      case 'runtime':
      case 'system':
        // Push the other source on top of the list.
        array_unshift($this->try, $name);
        $this->log(pht("Switching to source '%s'.", $name));
        return false;
      case 'yield':
        // Cycle this source to the end of the list.
        $this->try[] = array_shift($this->try);
        $this->log(pht("Yielding processing of rules from '%s'.", $source));
        return false;
      case 'halt':
        // Dump the whole stack.
        $this->try = array();
        $this->log(pht('Halting all rule processing.'));
        return false;
      case 'skip':
        return null;
      case 'empty':
      case 'upstream':
      case 'outgoing':
      case 'bookmark':
      case 'amended':
      case 'this':
        return $this->api->resolveBaseCommitRule($rule, $source);
      default:
        $matches = null;
        if (preg_match('/^exec\((.*)\)$/', $name, $matches)) {
          $root = $this->api->getWorkingCopyIdentity()->getProjectRoot();
          $future = new ExecFuture('%C', $matches[1]);
          $future->setCWD($root);
          list($err, $stdout) = $future->resolve();
          if (!$err) {
            return trim($stdout);
          } else {
            return null;
          }
        } else if (preg_match('/^nodiff\((.*)\)$/', $name, $matches)) {
          return $this->api->resolveBaseCommitRule($rule, $source);
        }

        throw new ArcanistUsageException(
          pht(
            "Base commit rule '%s' (from source '%s') ".
            "is not a recognized rule.",
            $rule,
            $source));
    }
  }