Type¶

class dsviper.Type¶

Bases: object

The primitive types, and the utilities that act on any type.

Type.INT64, Type.STRING and the other scalars are read from here; the parameterized types are their own classes. Also encodes, decodes and sizes a type, and hashes it.

Note: Not directly instantiable.

ANY = any¶

ANY_CONCEPT = any_concept¶

BLOB = blob¶

BLOB_ID = blob_id¶

BOOL = bool¶

COMMIT_ID = commit_id¶

DOUBLE = double¶

FLOAT = float¶

INT16 = int16¶

INT32 = int32¶

INT64 = int64¶

INT8 = int8¶

STRING = string¶

UINT16 = uint16¶

UINT32 = uint32¶

UINT64 = uint64¶

UINT8 = uint8¶

UUID = uuid¶

VOID = void¶

static decode(blob: ValueBlob, definitions: DefinitionsConst, *, stream_codec_instancing: StreamCodecInstancing | None = None) → Type¶: Return a type by decoding the blob with Codec.STREAM_BINARY if not specified.

static encode(type: Type, *, stream_codec_instancing: StreamCodecInstancing | None = None) → ValueBlob¶: Return a blob that encodes the type with Codec.STREAM_BINARY if not specified.

static hexdigest(type: Type, *, hashing: Hashing | None = None) → str¶: Return the hexa digest of the type computed with the hashing interface if specified else use SHA1.

static is_sized(type: Type) → bool¶

Return True if the type has a fixed size and reads back alone.

A key is two uuids yet not sized: reading one back needs the definitions, which a pack-sized vector does not hold.

static read(stream_reading: StreamReading, definitions: DefinitionsConst) → Type¶: Read and return a type.

static size_of(type: Type, stream_sizing: StreamSizing) → int¶: Return the fixed size of the type or raise.

static use_blob_id(type: Type) → bool¶: Return True if the type uses the type blob_id.

static use_commit_id(type: Type) → bool¶: Return True if the type uses the type commit_id.

static write(type: Type, stream_writing: StreamWriting) → None¶: Write a type.