* refactor: encoding container id
* fix: container indexing when merged ops in encoding
* chore: add compress encode size for draw example
* fix: do not need cids in encoding
* chore: change name containerIdx to containerType in encoding
* fix: avoid enter invalid richtext state
* fix: only include the style when the doc contains both style start and style end
* fix: iter_range err in richtext state
* fix: richtext state iter range
* fix: iter range err
* fix: iter range
* chore: rm log
* fix: iter range
* fix: get affected range
* fix: return err if given checkout target is invalid
* refactor(wasm): extract VersionVector class and fix inconsistent PeerID in wasm
* fix: example type err
* fix: binding err
* fix: peer id repr should be consistent
* test: update tests
* refactor: use rich text style config
* chore: rm log
* feat: support config text style in wasm
* feat: overlapped styles
* chore: add warning style key cannot contain ':'
* test: refine test case for richtext
* test: refine test
* refactor: rm txn.abort and related undo behavior
* perf: simplify richtext state when there is not styles
* perf: reduce text cost when there is no style
* chore: refine logs
* perf: remove cid in states to reduce mem overhead
* refactor: reduce mem overhead by using a compacter mapvalue
* refactor: rm the box inside richtext state
This pull request fixes an issue in the Tracker module where only the target span was forwarded during forwarding instead of forwarding all content from vv to the target opid. This resulted in errors in current_vv. The issue is resolved by updating the forward function in the Tracker module to include the entire range of content to be forwarded.
It also fixed the inconsistent issue in richtext between style anchors and style ranges.
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Co-authored-by: leeeon233 <leeeon233@gmail.com>
* refactor: make container states can get their ids
* test: add utils to test consistency between the current states and diff calc
* test: add state diff calc consistency check
This PR implements a new encode schema that is more extendible and more compact. It’s also simpler and takes less binary size and maintaining effort. It is inspired by the [Automerge Encoding Format](https://automerge.org/automerge-binary-format-spec/).
The main motivation is the extensibility. When we integrate a new CRDT algorithm, we don’t want to make a breaking change to the encoding or keep multiple versions of the encoding schema in the code, as it will make our WASM size much larger. We need a stable and extendible encoding schema for our v1.0 version.
This PR also exposes the ops that compose the current container state. For example, now you can make a query about which operation a certain character quickly. This behavior is required in the new snapshot encoding, so it’s included in this PR.
# Encoding Schema
## Header
The header has 22 bytes.
- (0-4 bytes) Magic Bytes: The encoding starts with `loro` as magic bytes.
- (4-20 bytes) Checksum: MD5 checksum of the encoded data, including the header starting from 20th bytes. The checksum is encoded as a 16-byte array. The `checksum` and `magic bytes` fields are trimmed when calculating the checksum.
- (20-21 bytes) Encoding Method (2 bytes, big endian): Multiple encoding methods are available for a specific encoding version.
## Encode Mode: Updates
In this approach, only ops, specifically their historical record, are encoded, while document states are excluded.
Like Automerge's format, we employ columnar encoding for operations and changes.
Previously, operations were ordered by their Operation ID (OpId) before columnar encoding. However, sorting operations based on their respective containers initially enhance compression potential.
## Encode Mode: Snapshot
This mode simultaneously captures document state and historical data. Upon importing a snapshot into a new document, initialization occurs directly from the snapshot, bypassing the need for CRDT-based recalculations.
Unlike previous snapshot encoding methods, the current binary output in snapshot mode is compatible with the updates mode. This enhances the efficiency of importing snapshots into non-empty documents, where initialization via snapshot is infeasible.
Additionally, when feasible, we leverage the sequence of operations to construct state snapshots. In CRDTs, deducing the specific ops constituting the current container state is feasible. These ops are tagged in relation to the container, facilitating direct state reconstruction from them. This approach, pioneered by Automerge, significantly improves compression efficiency.
