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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | 59x 59x 59x 59x 6325x 6325x 6325x 598x 598x 598x 5795x 5795x 6325x 7x 7x 7x 7x 7x 7x | import {CONST, updateNum} from '../../../json-hash';
import {updateId} from '../../../json-crdt/hash';
import {type ITimestampStruct, Timestamp, printTs} from '../../../json-crdt-patch/clock';
import type {IChunkSlice} from './types';
import type {Stateful} from '../types';
import type {Printable} from 'tree-dump/lib/types';
import type {Chunk} from '../../../json-crdt/nodes/rga';
export class ChunkSlice<T = string> implements IChunkSlice<T>, Stateful, Printable {
constructor(
/** Chunk from which slice is computed. */
chunk: Chunk<T>,
/** Start offset of the slice within the chunk. */
public off: number,
/** Length of the slice. */
public len: number,
) {
this.chunk = chunk;
}
// -------------------------------------------------------------- IChunkSlice
public readonly chunk: Chunk<T>;
public id(): ITimestampStruct {
const id = this.chunk.id;
const off = this.off;
return !off ? id : new Timestamp(id.sid, id.time + off);
}
public key(): string {
const id = this.chunk.id;
const sid = id.sid;
const time = id.time + this.off;
return sid.toString(36) + time.toString(36);
}
public view(): T {
const offset = this.off;
return this.chunk.view().slice(offset, offset + this.len);
}
// ----------------------------------------------------------------- Stateful
public hash: number = 0;
public refresh(): number {
const {chunk, off, len} = this;
const delOffLenState = (((off << 16) + len) << 1) + +chunk.del;
let state = CONST.START_STATE;
state = updateId(state, chunk.id);
state = updateNum(state, delOffLenState);
return (this.hash = state);
}
// ---------------------------------------------------------------- Printable
public toString(tab: string = ''): string {
const name = 'ChunkSlice';
const off = this.off;
const len = this.len;
const str = this.view() + '';
const truncate = str.length > 32;
const view = JSON.stringify(truncate ? str.slice(0, 32) : str) + (truncate ? ' …' : '');
const id = printTs(this.chunk.id);
return `${name} ${id} [${off}..${off + len}) ${view}`;
}
}
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