Behat\Behat\Gherkin\ServiceContainer\GherkinExtension::createFilterDefinition PHP Method

    private function createFilterDefinition($type, $filterString)
    {
        if ('role' === $type) {
            return new Definition('Behat\\Gherkin\\Filter\\RoleFilter', array($filterString));
        }
        if ('name' === $type) {
            return new Definition('Behat\\Gherkin\\Filter\\NameFilter', array($filterString));
        }
        if ('tags' === $type) {
            return new Definition('Behat\\Gherkin\\Filter\\TagFilter', array($filterString));
        }
        if ('narrative' === $type) {
            return new Definition('Behat\\Gherkin\\Filter\\NarrativeFilter', array($filterString));
        }
        throw new ExtensionException(sprintf('`%s` filter is not supported by the `filters` option of gherkin extension. Supported types are `%s`.', $type, implode('`, `', array('narrative', 'role', 'name', 'tags'))), 'gherkin');
    }