json-joy
Version:
Collection of libraries for building collaborative editing apps.
57 lines (56 loc) • 1.99 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ChunkSlice = void 0;
const json_hash_1 = require("../../../json-hash");
const hash_1 = require("../../../json-crdt/hash");
const clock_1 = require("../../../json-crdt-patch/clock");
class ChunkSlice {
constructor(
/** Chunk from which slice is computed. */
chunk,
/** Start offset of the slice within the chunk. */
off,
/** Length of the slice. */
len) {
this.off = off;
this.len = len;
// ----------------------------------------------------------------- Stateful
this.hash = 0;
this.chunk = chunk;
}
id() {
const id = this.chunk.id;
const off = this.off;
return !off ? id : new clock_1.Timestamp(id.sid, id.time + off);
}
key() {
const id = this.chunk.id;
const sid = id.sid;
const time = id.time + this.off;
return sid.toString(36) + time.toString(36);
}
view() {
const offset = this.off;
return this.chunk.view().slice(offset, offset + this.len);
}
refresh() {
const { chunk, off, len } = this;
const delOffLenState = (((off << 16) + len) << 1) + +chunk.del;
let state = json_hash_1.CONST.START_STATE;
state = (0, hash_1.updateId)(state, chunk.id);
state = (0, json_hash_1.updateNum)(state, delOffLenState);
return (this.hash = state);
}
// ---------------------------------------------------------------- Printable
toString(tab = '') {
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 = (0, clock_1.printTs)(this.chunk.id);
return `${name} ${id} [${off}..${off + len}) ${view}`;
}
}
exports.ChunkSlice = ChunkSlice;