/// The field or value is read-only.
attribute readonly;

/// References other object (foreign key in RDBMS)
attribute references;

/// At most one record can have this value at any point in time (unique constraint in RDBMS)
attribute unique;

/// Meta type attribute.
attribute type;

/// Meta options attribute.
attribute options;

/// A NumPy one dimensional (`ndim=1`) `numpy.ndarray` container of items of the same type and size (`dtype.kind in ['b', 'i', 'u', 'f']`).
attribute ndarray;

/// (works around "error: only non-scalar fields in tables may be 'required'")
attribute arg;

attribute kwarg;


///////////// Attributes supported for integers

/// Timestamp: ns since Unix epoch (1970/1/1 UTC) (64 bit unsigned int).
attribute timestamp;


/// WAMP ID, that is an integer ``[1, 2^53]``, see https://wamp-proto.org/_static/gen/wamp_latest_ietf.html#ids
attribute wampid;

/// WAMP URI component (aka "name"), loose rules (minimum required to combine to dotted URIs), must match regular expression ``^[^\s\.#]+$``.
attribute wampname;

/// WAMP URI component (aka "name"), strict rules (can be used as identifier in most languages), must match regular expression ``^[\da-z_]+$``.
attribute wampname_s;

/// WAMP URI, loose rules, no empty URI components (aka "concrete or fully qualified URI"), must match regular expression ``^([^\s\.#]+\.)*([^\s\.#]+)$``.
attribute wampuri;

/// WAMP URI, strict rules, no empty URI components, must match regular expression ``^([\da-z_]+\.)*([\da-z_]+)$``.
attribute wampuri_s;

/// WAMP URI or URI (prefix or wildcard) pattern, loose rules (minimum required to combine to dotted URIs), must match regular expression ``^(([^\s\.#]+\.)|\.)*([^\s\.#]+)?$``.
attribute wampuri_p;

/// WAMP URI or URI (prefix or wildcard) pattern, strict rules (can be used as identifier in most languages), must match regular expression ``^(([\da-z_]+\.)|\.)*([\da-z_]+)?$``.
attribute wampuri_sp;

/// WAMP URI or URI prefix pattern, loose rules (minimum required to combine to dotted URIs), must match regular expression ``^([^\s\.#]+\.)*([^\s\.#]*)$``.
attribute wampuri_pp;

/// WAMP URI or URI prefix pattern, strict rules (can be used as identifier in most languages), must match regular expression ``^([\da-z_]+\.)*([\da-z_]*)$``.
attribute wampuri_spp;


///////////// Attributes supported for strings

/// WAMP URI resource name or resource name pattern for identifying WAMP resource like
/// procedures and topics. WAMP resource names are hierarchically structured consisting
/// of a sequence of path segments separated by dots, e.g. `com.example.add2` or
/// `com.example.public.`.
attribute wampuri;

/// A URL locating a Web resource, see https://url.spec.whatwg.org/.
attribute url;

/// Multihash string (eg IPFS), see https://github.com/multiformats/multihash.
attribute multihash;


///////////// Attributes supported for byte strings (`[uint8]`)

/// CBOR-serialized object or value.
attribute cbor;

/// Ethereum (off-chain EIP712) signature (65 bytes).
attribute ethsig;


///////////// Attributes supported for large integers

/// UUID (128 bit binary).
attribute uuid;

/// Ethereum address (160 bit binary).
attribute ethadr;

/// Ethereum value (256 bit binary).
attribute ethval;

/// Ethereum block number (256 bit binary).
attribute ethblock;

/// Ethereum (Keccak-256) hash (256 bit binary). See https://github.com/ethereum/wiki/wiki/Ethash.
attribute ethhash;

/*
Arrays are a convenience short-hand for a fixed-length collection of
elements. Arrays are currently only supported in a struct.
 */

/// An unsigned integer with 256 bits.
struct uint256_t {

    // Arrays are currently only supported in a struct.
    // FIXME: type_desc_str = FbsType.FBS2STR[field.type.basetype] KeyError: 17
    // w: [uint32:8];

    /// Least significand 32 bits.
    w0: uint32;

    /// 2nd significand 32 bits.
    w1: uint32;

    /// 3rd significand 32 bits.
    w2: uint32;

    /// 4th significand 32 bits.
    w3: uint32;

    /// 5th significand 32 bits.
    w4: uint32;

    /// 6th significand 32 bits.
    w5: uint32;

    /// 7th significand 32 bits.
    w6: uint32;

    /// Most significand 32 bits.
    w7: uint32;
}

/// An unsigned integer with 160 bits.
struct uint160_t (arg) {
    /// Least significand 32 bits.
    w0: uint32;

    /// 2nd significand 32 bits.
    w1: uint32;

    /// 3rd significand 32 bits.
    w2: uint32;

    /// 4th significand 32 bits.
    w3: uint32;

    /// Most significand 32 bits.
    w4: uint32;
}

/// An unsigned integer with 128 bits.
struct uint128_t {
    /// Least significand 32 bits.
    w0: uint32;

    /// 2nd significand 32 bits.
    w1: uint32;

    /// 3rd significand 32 bits.
    w2: uint32;

    /// Most significand 32 bits.
    w3: uint32;
}

/// Object version reference.
struct objref_t
{
    /// OID of the referenced object: 128 bit with UUID.
    oid: uint128_t (uuid);

    /// Version of the referenced object, starting with 1, and incremented
    // by 1 on each object modification.
    version: uint32;
}

/// The void type containing no value at all.
table Void
{
}

/// A key-value pair with (string typed keys and values).
table KeyValue
{
    /// UTF8 encoded key of KV pair.
    key: string (required, key, arg);

    /// UTF8 encoded value of KV pair.
    value: string (arg);
}

/// A list of key-value pairs (with string typed keys and values).
table KeyValues
{
    /// List of key-value pairs.
    value: [KeyValue] (arg);
}

/// A single WAMP ID.
table WampId
{
    /// WAMP ID (integers [1, 2^53]), see https://wamp-proto.org/_static/gen/wamp_latest_ietf.html#ids
    value: uint64 (arg, wampid);
}

/// A list of WAMP IDs.
table WampIds
{
    /// List of WAMP IDs.
    value: [uint64] (arg, wampid);
}

/// A single WAMP resource name (URI).
table WampUri
{
    /// WAMP resource name (URI), such as ``realm1`` or ``com.example.add2``,
    /// or a name pattern, such as ``com.example.`` or ``com.example.<myapp:str>.get_info``.
    /// Must match regular expression ``^(([^\s\.#]+\.)|\.)*([^\s\.#]+)?$``.
    value: string (arg, wampuri);
}

/// A list of WAMP resource names (URIs).
table WampUris
{
    /// List of WAMP resource names (URIs).
    value: [string] (arg, wampuri);
}

/// A single WAMP URI component.
table WampName
{
    /// WAMP URI component, such as ``realm1``, ``intel-nuci7-14875`` or ``11bf2dd0-432e-460e-9df0-55d497fa1cd1``.
    /// Must match regular expression ``^[^\s\.#]+$``.
    value: string (arg, wampname);
}

/// A list of WAMP URI components.
table WampNames
{
    /// List of WAMP URI components.
    value: [string] (arg, wampname);
}

/// A single object UUID.
table Oid
{
    /// Object UUID.
    value: uint128_t (arg, uuid);
}

/// A list of object UUIDs
table Oids
{
    /// List of object UUIDs.
    value: [uint128_t] (arg, uuid);
}

/// A single Ethereum address.
table EthAddress
{
    /// The address binary value.
    value: uint160_t (arg, ethadr);
}

/// A list of Ethereum addresses.
table EthAddresses
{
    /// List of addresses.
    value: [uint160_t] (arg, ethadr);
}

/// A single unsigned integer, wrapped as a table.
table Uint
{
    /// Unsigned integer value.
    value: uint64 (arg);
}

/// A list of unsigned integers, wrapped as a table.
table Uints
{
    /// List of unsigned integer values.
    value: [uint64] (arg);
}
