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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 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 | 65x 65x 65x 90x 90x 127x 127x 127x 127x 127x 127x 24x 24x 24x 19x 19x 19x 3x 3x 35x 35x 10x 10x 42x 42x 42x 12x 12x | import {s} from '../../../json-crdt-patch';
import {ConApi, ObjApi, VecApi} from '../../../json-crdt/model';
import type {ConNode, ObjNode, VecNode} from '../../../json-crdt/nodes';
import type {NestedType} from './NestedType';
/**
* Represents a single nested tag in a slice type. For example, in a slice type
* like `['<blockquote>', 0, {author: 'Alice'}, ['<p>', 0, {indent: 2}]]`, there
* is a tag for the blockquote and a tag for the paragraph. Each tag can
* contain a discriminant and data.
*/
export class NestedTag<T = string> {
constructor(
protected readonly type: NestedType<T>,
public readonly index: number,
) {}
/**
* Enforces current tag at `index` to be a "vec" node, which contains
* a tag, a discriminant and an object with data.
*/
public asVec(): VecApi<VecNode<[ConNode<number | string>, ConNode<number>, ObjNode]>> {
const arr = this.type.asArr();
const typeLen = arr.length();
let index: number = this.index;
if (typeof index !== 'number' || index > typeLen - 1) index = typeLen - 1;
const vec = arr.get(index);
if (vec instanceof VecApi) return vec;
const tag = vec instanceof ConApi ? vec.view() : 0;
arr.upd(index, s.vec(s.con(tag)));
return arr.get(index) as VecApi;
}
/**
* Returns the tag name at the current index, which is either a string or a number.
* If the tag is not set, it returns `0`.
*
* @returns The tag value.
*/
public name(): string | number {
const vec = this.asVec();
const tag = vec.select(0)?.view();
return typeof tag === 'string' || typeof tag === 'number' ? tag : 0;
}
/**
* Sets the tag name at the current index. If the tag is not a string or a number,
* it will be converted to a string.
*
* @param tag - The tag value to set.
*/
public setName(tag: string | number): void {
const vec = this.asVec();
vec.set([[0, s.con(tag)]]);
}
/**
* Returns the discriminant of the tag at the current index.
* If the discriminant is not set, it returns `0`.
*
* @returns The discriminant value.
*/
public discriminant(): number {
const disciminant = this.asVec().select(1)?.view() || 0;
return typeof disciminant === 'number' ? disciminant : 0;
}
/**
* Sets the discriminant of the tag at the current index.
*
* @param value - The discriminant value to set.
*/
public setDiscriminant(value: number): void {
const vec = this.asVec();
vec.set([[1, s.con(value)]]);
}
/**
* Returns the data object of the tag at the current index.
* If the data is not set, it returns an empty object. Enforces the
* data to be a {@link ObjApi} node, use this API to manipulate the data
* object.
*
* @returns The data object.
*/
public data(): ObjApi {
const vec = this.asVec();
const data = vec.select(2);
if (data instanceof ObjApi) return data;
vec.set([[2, s.obj({})]]);
return vec.get(2) as ObjApi;
}
}
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