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41509x 30927x 76434x 76434x 76434x 10340x 7076x 6909x 6909x 76434x | import {
compare,
tick,
type ITimestampStruct,
type ITimespanStruct,
tss,
printTs,
containsId,
Timestamp,
} from '../../../json-crdt-patch/clock';
import {isUint8Array} from '@jsonjoy.com/util/lib/buffers/isUint8Array';
import {rSplay, lSplay, llSplay, rrSplay, lrSplay, rlSplay} from 'sonic-forest/lib/splay/util';
import {splay2} from 'sonic-forest/lib/splay/util2';
import {insert2, remove2} from 'sonic-forest/lib/util2';
import {ORIGIN} from '../../../json-crdt-patch/constants';
import {printTree} from 'tree-dump/lib/printTree';
import {printBinary} from 'tree-dump/lib/printBinary';
import {printOctets} from '@jsonjoy.com/util/lib/buffers/printOctets';
/**
* @category CRDT Node
*/
export interface Chunk<T> {
/** Unique sortable ID of this chunk and its span. */
id: ITimestampStruct;
/** Length of the logical clock interval of this chunk. */
span: number;
/** Whether this chunk is deleted. */
del: boolean;
/** Actual content of the chunk, may be undefined if chunk is deleted. */
data: T | undefined;
/** Length of content in this subtree (this node and its children). */
len: number;
/** Parent. */
p: Chunk<T> | undefined;
/** Left. */
l: Chunk<T> | undefined;
/** Right. */
r: Chunk<T> | undefined;
/** Parent 2. */
p2: Chunk<T> | undefined;
/** Left 2. */
l2: Chunk<T> | undefined;
/** Right 2. */
r2: Chunk<T> | undefined;
/** Split link, next chunk which was split from this chunk. */
s: Chunk<T> | undefined;
/** Add more content to this chunk. */
merge(content: T): void;
/**
* Split this chunk after given clock ticks. Minimal `ticks` is 1.
*/
split(ticks: number): Chunk<T>;
/** Mark chunk as deleted. */
delete(): void;
/** Return a deep copy of itself. */
clone(): Chunk<T>;
/** Return the data of the chunk, if not deleted. */
view(): T & {slice: (start: number, end: number) => T};
}
const compareById = (c1: Chunk<unknown>, c2: Chunk<unknown>): number => {
const ts1 = c1.id;
const ts2 = c2.id;
return ts1.sid - ts2.sid || ts1.time - ts2.time;
};
const updateLenOne = (chunk: Chunk<unknown>): void => {
const l = chunk.l;
const r = chunk.r;
chunk.len = (chunk.del ? 0 : chunk.span) + (l ? l.len : 0) + (r ? r.len : 0);
};
const updateLenOneLive = (chunk: Chunk<unknown>): void => {
const l = chunk.l;
const r = chunk.r;
chunk.len = chunk.span + (l ? l.len : 0) + (r ? r.len : 0);
};
const dLen = (chunk: Chunk<unknown> | undefined, delta: number): void => {
while (chunk) {
chunk.len += delta;
chunk = chunk.p;
}
};
const next = <T>(curr: Chunk<T>): Chunk<T> | undefined => {
const r = curr.r;
if (r) {
curr = r;
let tmp: Chunk<T> | undefined;
while ((tmp = curr.l)) curr = tmp;
return curr;
}
let p = curr.p;
while (p && p.r === curr) {
curr = p;
p = p.p;
}
return p;
};
const prev = <T>(curr: Chunk<T>): Chunk<T> | undefined => {
const l = curr.l;
if (l) {
curr = l;
let tmp: Chunk<T> | undefined;
while ((tmp = curr.r)) curr = tmp;
return curr;
}
let p = curr.p;
while (p && p.l === curr) {
curr = p;
p = p.p;
}
return p;
};
/**
* @category CRDT Node
*/
export abstract class AbstractRga<T> {
public root: Chunk<T> | undefined = undefined;
public ids: Chunk<T> | undefined = undefined;
public count: number = 0;
public abstract view(): unknown;
protected abstract createChunk(id: ITimestampStruct, content: T | undefined): Chunk<T>;
protected abstract onChange(): void;
constructor(public readonly id: ITimestampStruct) {}
// --------------------------------------------------------------- Public API
public ins(after: ITimestampStruct, id: ITimestampStruct, content: T): void {
const rootId = this.id;
const afterTime = after.time;
const afterSid = after.sid;
// TODO: perf: sid equality check is redundant? As it is implied by time equality.
const isRootInsert = rootId.time === afterTime && rootId.sid === afterSid;
if (isRootInsert) {
this.insAfterRoot(after, id, content);
return;
}
let curr: Chunk<T> | undefined = this.ids;
let chunk: Chunk<T> | undefined = curr;
while (curr) {
const currId = curr.id;
const currIdSid = currId.sid;
if (currIdSid > afterSid) {
curr = curr.l2;
} else if (currIdSid < afterSid) {
chunk = curr;
curr = curr.r2;
} else {
const currIdTime = currId.time;
if (currIdTime > afterTime) {
curr = curr.l2;
} else if (currIdTime < afterTime) {
chunk = curr;
curr = curr.r2;
} else {
chunk = curr;
break;
}
}
}
if (!chunk) return;
const atId = chunk.id;
const atIdTime = atId.time;
const atIdSid = atId.sid;
const atSpan = chunk.span;
Iif (atIdSid !== afterSid) return;
const offset = afterTime - atIdTime;
if (offset >= atSpan) return;
const offsetInInsertAtChunk = afterTime - atIdTime;
this.insAfterChunk(after, chunk, offsetInInsertAtChunk, id, content);
}
public insAt(position: number, id: ITimestampStruct, content: T): ITimestampStruct | undefined {
if (!position) {
const rootId = this.id;
this.insAfterRoot(rootId, id, content);
return rootId;
}
const found = this.findChunk(position - 1);
Iif (!found) return undefined;
const [at, offset] = found;
const atId = at.id;
const after = offset === 0 ? atId : new Timestamp(atId.sid, atId.time + offset);
this.insAfterChunk(after, at, offset, id, content);
return after;
}
protected insAfterRoot(after: ITimestampStruct, id: ITimestampStruct, content: T): void {
const chunk = this.createChunk(id, content);
const first = this.first();
if (!first) this.setRoot(chunk);
else if (compare(first.id, id) < 0) this.insertBefore(chunk, first);
else {
if (containsId(first.id, first.span, id)) return;
this.insertAfterRef(chunk, after, first);
}
}
protected insAfterChunk(
after: ITimestampStruct,
chunk: Chunk<T>,
chunkOffset: number,
id: ITimestampStruct,
content: T,
): void {
const atId = chunk.id;
const atIdTime = atId.time;
const atIdSid = atId.sid;
const atSpan = chunk.span;
const newChunk = this.createChunk(id, content);
const needsSplit = chunkOffset + 1 < atSpan;
if (needsSplit) {
const idSid = id.sid;
const idTime = id.time;
if (atIdSid === idSid && atIdTime <= idTime && atIdTime + atSpan - 1 >= idTime) return;
if (idTime > after.time + 1 || idSid > after.sid) {
this.insertInside(newChunk, chunk, chunkOffset + 1);
this.splay(newChunk);
return;
}
}
this.insertAfterRef(newChunk, after, chunk);
this.splay(newChunk);
}
public delete(spans: ITimespanStruct[]): void {
const length = spans.length;
for (let i = 0; i < length; i++) this.deleteSpan(spans[i]);
this.onChange();
}
protected deleteSpan(span: ITimespanStruct): void {
const len = span.span;
const t1 = span.time;
const t2 = t1 + len - 1;
const start = this.findById(span);
if (!start) return;
let chunk: Chunk<T> | undefined = start;
let last: Chunk<T> | undefined = chunk;
while (chunk) {
last = chunk;
const id = chunk.id;
const chunkSpan = chunk.span;
const c1 = id.time;
const c2 = c1 + chunkSpan - 1;
if (chunk.del) {
if (c2 >= t2) break;
chunk = chunk.s;
continue;
}
const deleteStartsFromLeft = t1 <= c1;
const deleteStartsInTheMiddle = t1 <= c2;
if (deleteStartsFromLeft) {
const deleteFullyContainsChunk = t2 >= c2;
if (deleteFullyContainsChunk) {
chunk.delete();
dLen(chunk, -chunk.span);
if (t2 <= c2) break;
} else {
const range = t2 - c1 + 1;
const newChunk = this.split(chunk, range);
chunk.delete();
updateLenOne(newChunk);
dLen(chunk, -chunk.span);
break;
}
} else if (deleteStartsInTheMiddle) {
const deleteContainsRightSide = t2 >= c2;
if (deleteContainsRightSide) {
const offset = t1 - c1;
const newChunk = this.split(chunk, offset);
newChunk.delete();
newChunk.len = newChunk.r ? newChunk.r.len : 0;
dLen(chunk, -newChunk.span);
if (t2 <= c2) break;
} else {
const right = this.split(chunk, t2 - c1 + 1);
const mid = this.split(chunk, t1 - c1);
mid.delete();
updateLenOne(right);
updateLenOne(mid);
dLen(chunk, -mid.span);
break;
}
}
chunk = chunk.s;
}
if (last) this.mergeTombstones2(start, last);
}
public find(position: number): undefined | ITimestampStruct {
let curr = this.root;
while (curr) {
const l = curr.l;
const leftLength = l ? l.len : 0;
let span: number;
if (position < leftLength) curr = l;
else if (curr.del) {
position -= leftLength;
curr = curr.r;
} else if (position < leftLength + (span = curr.span)) {
const ticks = position - leftLength;
const id = curr.id;
return !ticks ? id : new Timestamp(id.sid, id.time + ticks);
} else {
position -= leftLength + span;
curr = curr.r;
}
}
return;
}
public findChunk(position: number): undefined | [chunk: Chunk<T>, offset: number] {
let curr = this.root;
while (curr) {
const l = curr.l;
const leftLength = l ? l.len : 0;
let span: number;
if (position < leftLength) curr = l;
else if (curr.del) {
position -= leftLength;
curr = curr.r;
} else if (position < leftLength + (span = curr.span)) {
return [curr, position - leftLength];
} else {
position -= leftLength + span;
curr = curr.r;
}
}
return;
}
public findInterval(position: number, length: number): ITimespanStruct[] {
const ranges: ITimespanStruct[] = [];
if (!length) return ranges;
let curr = this.root;
let offset: number = 0;
while (curr) {
const leftLength = curr.l ? curr.l.len : 0;
if (position < leftLength) curr = curr.l;
else if (curr.del) {
position -= leftLength;
curr = curr.r;
} else if (position < leftLength + curr.span) {
offset = position - leftLength;
break;
} else {
position -= leftLength + curr.span;
curr = curr.r;
}
}
if (!curr) return ranges;
if (curr.span >= length + offset) {
const id = curr.id;
ranges.push(tss(id.sid, id.time + offset, length));
return ranges;
}
const len = curr.span - offset;
const id = curr.id;
ranges.push(tss(id.sid, id.time + offset, len));
length -= len;
curr = next(curr);
if (!curr) return ranges;
do {
if (curr.del) continue;
const id = curr.id;
const span = curr.span;
if (length <= span) {
ranges.push(tss(id.sid, id.time, length));
return ranges;
}
ranges.push(tss(id.sid, id.time, span));
length -= span;
} while ((curr = next(curr)) && length > 0);
return ranges;
}
/** Rename to .rangeX() method? */
public findInterval2(from: ITimestampStruct, to: ITimestampStruct): ITimespanStruct[] {
const ranges: ITimespanStruct[] = [];
this.range0(undefined, from, to, (chunk, off, len) => {
const id = chunk.id;
ranges.push(tss(id.sid, id.time + off, len));
});
return ranges;
}
/**
* @note All ".rangeX()" method are not performance optimized. For hot paths
* it is better to hand craft the loop.
*
* @param startChunk Chunk from which to start the range. If undefined, the
* chunk containing `from` will be used. This is an optimization
* to avoid a lookup.
* @param from ID of the first element in the range.
* @param to ID of the last element in the range.
* @param callback Function to call for each chunk slice in the range. If it
* returns truthy value, the iteration will stop.
* @returns Reference to the last chunk in the range.
*/
public range0(
startChunk: Chunk<T> | undefined,
from: ITimestampStruct,
to: ITimestampStruct,
callback: (chunk: Chunk<T>, off: number, len: number) => boolean | void,
): Chunk<T> | void {
let chunk: Chunk<T> | undefined = startChunk ? startChunk : this.findById(from);
if (startChunk) while (chunk && !containsId(chunk.id, chunk.span, from)) chunk = next(chunk);
Iif (!chunk) return;
if (!chunk.del) {
const off: number = from.time - chunk.id.time;
const toContainedInChunk = containsId(chunk.id, chunk.span, to);
if (toContainedInChunk) {
const len = to.time - from.time + 1;
callback(chunk, off, len);
return chunk;
}
const len = chunk.span - off;
if (callback(chunk, off, len)) return chunk;
} else {
if (containsId(chunk.id, chunk.span, to)) return;
}
chunk = next(chunk);
while (chunk) {
const toContainedInChunk = containsId(chunk.id, chunk.span, to);
// TODO: fast path for chunk.del
if (toContainedInChunk) {
if (!chunk.del) Iif (callback(chunk, 0, to.time - chunk.id.time + 1)) return chunk;
return chunk;
}
if (!chunk.del) Iif (callback(chunk, 0, chunk.span)) return chunk;
chunk = next(chunk);
}
return chunk;
}
// ---------------------------------------------------------------- Retrieval
public first(): Chunk<T> | undefined {
let curr = this.root;
while (curr) {
const l = curr.l;
if (l) curr = l;
else return curr;
}
return curr;
}
public last(): Chunk<T> | undefined {
let curr = this.root;
while (curr) {
const r = curr.r;
if (r) curr = r;
else return curr;
}
return curr;
}
public lastId(): ITimestampStruct | undefined {
const chunk = this.last();
Iif (!chunk) return undefined;
const id = chunk.id;
const span = chunk.span;
return span === 1 ? id : new Timestamp(id.sid, id.time + span - 1);
}
/** @todo Maybe use implementation from tree utils, if does not impact performance. */
/** @todo Or better remove this method completely, as it does not require "this". */
public next(curr: Chunk<T>): Chunk<T> | undefined {
return next(curr);
}
/** @todo Maybe use implementation from tree utils, if does not impact performance. */
/** @todo Or better remove this method completely, as it does not require "this". */
public prev(curr: Chunk<T>): Chunk<T> | undefined {
return prev(curr);
}
/** Content length. */
public length(): number {
const root = this.root;
return root ? root.len : 0;
}
/** Number of chunks. */
public size(): number {
return this.count;
}
/** Returns the position of the first element in the chunk. */
public pos(chunk: Chunk<T>): number {
const p = chunk.p;
const l = chunk.l;
if (!p) return l ? l.len : 0;
const parentPos = this.pos(p);
const isRightChild = p.r === chunk;
if (isRightChild) return parentPos + (p.del ? 0 : p.span) + (l ? l.len : 0);
const r = chunk.r;
return parentPos - (chunk.del ? 0 : chunk.span) - (r ? r.len : 0);
}
// --------------------------------------------------------------- Insertions
public setRoot(chunk: Chunk<T>): void {
this.root = chunk;
this.insertId(chunk);
this.onChange();
}
public insertBefore(chunk: Chunk<T>, before: Chunk<T>): void {
const l = before.l;
before.l = chunk;
chunk.l = l;
chunk.p = before;
let lLen = 0;
Iif (l) {
l.p = chunk;
lLen = l.len;
}
chunk.len = chunk.span + lLen;
dLen(before, chunk.span);
this.insertId(chunk);
this.onChange();
}
public insertAfter(chunk: Chunk<T>, after: Chunk<T>): void {
const r = after.r;
after.r = chunk;
chunk.r = r;
chunk.p = after;
let rLen = 0;
if (r) {
r.p = chunk;
rLen = r.len;
}
chunk.len = chunk.span + rLen;
dLen(after, chunk.span);
this.insertId(chunk);
this.onChange();
}
protected insertAfterRef(chunk: Chunk<T>, ref: ITimestampStruct, left: Chunk<T>): void {
const id = chunk.id;
const sid = id.sid;
const time = id.time;
let isSplit: boolean = false;
for (;;) {
const leftId = left.id;
const leftNextTick = leftId.time + left.span;
if (!left.s) {
isSplit = leftId.sid === sid && leftNextTick === time && leftNextTick - 1 === ref.time;
if (isSplit) left.s = chunk;
}
const right = next(left);
if (!right) break;
const rightId = right.id;
const rightIdTime = rightId.time;
const rightIdSid = rightId.sid;
if (rightIdTime < time) break;
if (rightIdTime === time) {
if (rightIdSid === sid) return;
if (rightIdSid < sid) break;
}
left = right;
}
if (isSplit && !left.del) {
this.mergeContent(left, chunk.data!);
left.s = undefined;
} else this.insertAfter(chunk, left);
}
protected mergeContent(chunk: Chunk<T>, content: T): void {
const span1 = chunk.span;
chunk.merge(content);
dLen(chunk, chunk.span - span1);
this.onChange();
return;
}
protected insertInside(chunk: Chunk<T>, at: Chunk<T>, offset: number): void {
const p = at.p;
const l = at.l;
const r = at.r;
const s = at.s;
const len = at.len;
const at2 = at.split(offset);
at.s = at2;
at2.s = s;
at.l = at.r = at2.l = at2.r = undefined;
at2.l = undefined;
chunk.p = p;
if (!l) {
chunk.l = at;
at.p = chunk;
} else {
chunk.l = l;
l.p = chunk;
const a = l.r;
l.r = at;
at.p = l;
at.l = a;
if (a) a.p = at;
}
if (!r) {
chunk.r = at2;
at2.p = chunk;
} else {
chunk.r = r;
r.p = chunk;
const b = r.l;
r.l = at2;
at2.p = r;
at2.r = b;
if (b) b.p = at2;
}
if (!p) this.root = chunk;
else if (p.l === at) p.l = chunk;
else p.r = chunk;
updateLenOne(at);
updateLenOne(at2);
if (l) l.len = (l.l ? l.l.len : 0) + at.len + (l.del ? 0 : l.span);
if (r) r.len = (r.r ? r.r.len : 0) + at2.len + (r.del ? 0 : r.span);
chunk.len = len + chunk.span;
const span = chunk.span;
let curr = chunk.p;
while (curr) {
curr.len += span;
curr = curr.p;
}
// TODO: perf: could insert these two ids in one go
this.insertId(at2);
this.insertIdFast(chunk);
this.onChange();
}
protected split(chunk: Chunk<T>, ticks: number): Chunk<T> {
const s = chunk.s;
const newChunk = chunk.split(ticks);
const r = chunk.r;
chunk.s = newChunk;
newChunk.r = r;
newChunk.s = s;
chunk.r = newChunk;
newChunk.p = chunk;
this.insertId(newChunk);
if (r) r.p = newChunk;
return newChunk;
}
protected mergeTombstones(ch1: Chunk<T>, ch2: Chunk<T>): boolean {
if (!ch1.del || !ch2.del) return false;
const id1 = ch1.id;
const id2 = ch2.id;
if (id1.sid !== id2.sid) return false;
if (id1.time + ch1.span !== id2.time) return false;
ch1.s = ch2.s;
ch1.span += ch2.span;
this.deleteChunk(ch2);
return true;
}
protected mergeTombstones2(start: Chunk<T>, end: Chunk<T>): void {
let curr: Chunk<T> | undefined = start;
while (curr) {
const nextCurr = next(curr);
if (!nextCurr) break;
const merged = this.mergeTombstones(curr, nextCurr);
if (!merged) {
Iif (nextCurr === end) {
Iif (nextCurr) {
const n = next(nextCurr);
Iif (n) this.mergeTombstones(nextCurr, n);
}
break;
}
curr = curr.s;
}
}
const left = prev(start);
if (left) this.mergeTombstones(left, start);
}
public removeTombstones(): void {
let curr = this.first();
const list: Chunk<T>[] = [];
while (curr) {
if (curr.del) list.push(curr);
curr = next(curr);
}
for (let i = 0; i < list.length; i++) this.deleteChunk(list[i]);
}
public deleteChunk(chunk: Chunk<T>): void {
this.deleteId(chunk);
const p = chunk.p;
const l = chunk.l;
const r = chunk.r;
chunk.id = ORIGIN; // mark chunk as disposed
// TODO: perf: maybe set .p, .l, .r to undefined to help GC?
if (!l && !r) {
if (!p) this.root = undefined;
else {
if (p.l === chunk) p.l = undefined;
else p.r = undefined;
}
} else if (l && r) {
let mostRightChildFromLeft = l;
while (mostRightChildFromLeft.r) mostRightChildFromLeft = mostRightChildFromLeft.r;
mostRightChildFromLeft.r = r;
r.p = mostRightChildFromLeft;
const rLen = r.len;
let curr: undefined | Chunk<T>;
curr = mostRightChildFromLeft;
if (!p) {
this.root = l;
l.p = undefined;
} else {
if (p.l === chunk) p.l = l;
else p.r = l;
l.p = p;
}
while (curr && curr !== p) {
curr.len += rLen;
curr = curr.p;
}
} else {
const child = (l || r)!;
child.p = p;
if (!p) this.root = child;
else if (p.l === chunk) p.l = child;
else p.r = child;
}
}
public insertId(chunk: Chunk<T>): void {
this.ids = insert2(this.ids, chunk, compareById);
this.count++;
this.ids = splay2(this.ids, chunk);
}
public insertIdFast(chunk: Chunk<T>): void {
this.ids = insert2(this.ids, chunk, compareById);
this.count++;
}
protected deleteId(chunk: Chunk<T>): void {
this.ids = remove2(this.ids, chunk);
this.count--;
}
public findById(after: ITimestampStruct): undefined | Chunk<T> {
const afterSid = after.sid;
const afterTime = after.time;
let curr: Chunk<T> | undefined = this.ids;
let chunk: Chunk<T> | undefined = curr;
while (curr) {
const currId = curr.id;
const currIdSid = currId.sid;
if (currIdSid > afterSid) {
curr = curr.l2;
} else if (currIdSid < afterSid) {
chunk = curr;
curr = curr.r2;
} else {
const currIdTime = currId.time;
if (currIdTime > afterTime) {
curr = curr.l2;
} else if (currIdTime < afterTime) {
chunk = curr;
curr = curr.r2;
} else {
chunk = curr;
break;
}
}
}
if (!chunk) return;
const atId = chunk.id;
const atIdTime = atId.time;
const atIdSid = atId.sid;
const atSpan = chunk.span;
if (atIdSid !== afterSid) return;
if (afterTime < atIdTime) return;
const offset = afterTime - atIdTime;
if (offset >= atSpan) return;
return chunk;
}
// ---------------------------------------------------------- Splay balancing
public splay(chunk: Chunk<T>): void {
const p = chunk.p;
if (!p) return;
const pp = p.p;
const l2 = p.l === chunk;
if (!pp) {
if (l2) rSplay(chunk, p);
else lSplay(chunk, p);
this.root = chunk;
updateLenOne(p);
updateLenOneLive(chunk);
return;
}
const l1 = pp.l === p;
if (l1) {
if (l2) {
this.root = llSplay(this.root!, chunk, p, pp);
} else {
this.root = lrSplay(this.root!, chunk, p, pp);
}
} else {
if (l2) {
this.root = rlSplay(this.root!, chunk, p, pp);
} else {
this.root = rrSplay(this.root!, chunk, p, pp);
}
}
updateLenOne(pp);
updateLenOne(p);
updateLenOneLive(chunk);
this.splay(chunk);
}
// ---------------------------------------------------------- Export / Import
public iterator(): () => Chunk<T> | undefined {
let curr = this.first();
return () => {
const res = curr;
if (curr) curr = next(curr);
return res;
};
}
public ingest(size: number, next: () => Chunk<T>): void {
if (size < 1) return;
const splitLeftChunks = new Map<string, Chunk<T>>();
this.root = this._ingest(size, () => {
const chunk = next();
const id = chunk.id;
const key = id.sid + '.' + id.time;
const split = splitLeftChunks.get(key);
if (split) {
split.s = chunk;
splitLeftChunks.delete(key);
}
const nextStampAfterSpan = tick(id, chunk.span);
splitLeftChunks.set(nextStampAfterSpan.sid + '.' + nextStampAfterSpan.time, chunk);
return chunk;
});
}
private _ingest(size: number, next: () => Chunk<T>): Chunk<T> {
const leftSize = size >> 1;
const rightSize = size - leftSize - 1;
const c1 = leftSize > 0 ? this._ingest(leftSize, next) : undefined;
const c2 = next();
if (c1) {
c2.l = c1;
c1.p = c2;
}
const c3 = rightSize > 0 ? this._ingest(rightSize, next) : undefined;
if (c3) {
c2.r = c3;
c3.p = c2;
}
updateLenOne(c2);
// TODO: perf: splay only nodes with hight clock values and which are not tombstones?
this.insertId(c2);
return c2;
}
// ---------------------------------------------------------------- Printable
protected toStringName(): string {
return 'AbstractRga';
}
public toString(tab: string = ''): string {
const view = this.view();
let value = '';
if (isUint8Array(view)) value += ` { ${printOctets(view) || '∅'} }`;
else if (typeof view === 'string')
value += `{ ${view.length > 32 ? JSON.stringify(view.substring(0, 32)) + ' …' : JSON.stringify(view)} }`;
const header = `${this.toStringName()} ${printTs(this.id)} ${value}`;
return header + printTree(tab, [(tab) => (this.root ? this.printChunk(tab, this.root) : '∅')]);
}
protected printChunk(tab: string, chunk: Chunk<T>): string {
return (
this.formatChunk(chunk) +
printBinary(tab, [
chunk.l ? (tab) => this.printChunk(tab, chunk.l!) : null,
chunk.r ? (tab) => this.printChunk(tab, chunk.r!) : null,
])
);
}
protected formatChunk(chunk: Chunk<T>): string {
const id = printTs(chunk.id);
let str = `chunk ${id}:${chunk.span} .${chunk.len}.`;
if (chunk.del) str += ` [${chunk.span}]`;
else {
if (isUint8Array(chunk.data)) str += ` { ${printOctets(chunk.data) || '∅'} }`;
else if (typeof chunk.data === 'string') {
const data =
chunk.data.length > 32 ? JSON.stringify(chunk.data.substring(0, 32)) + ' …' : JSON.stringify(chunk.data);
str += ` { ${data} }`;
}
}
return str;
}
}
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