Automattic / jetpack

		$s = $this->seek();

		// speed shortcut

		if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] != "(") {

			return false;

		}

		$inParens = $this->inParens;

		if ($this->literal("(") &&

	// a bracketed value (contained within in a tag definition)

	protected function tagBracket(&$parts, &$hasExpression) {

		// speed shortcut

		if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] != "[") {

			return false;

		}

		$s = $this->seek();