Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 95 96 | 64x 64x 64x 64x 64x 64x 64x 4386x 4386x 4386x 724x 724x 724x 4386x 3068x 3068x 4831x 4831x 4831x 4831x 4831x 1477x 1477x 1477x 1477x 4831x 4831x 4831x 4831x 3068x 3068x 3068x 3068x 3068x 3068x 3068x 4886x 4886x 4886x 4831x 4831x 4831x 4831x | import {Block} from './Block';
import {commonLength} from '../util/commonLength';
import {printTree} from 'tree-dump/lib/printTree';
import {LeafBlock} from './LeafBlock';
import {Range} from '../rga/Range';
import {CommonSliceType, type SliceTypeSteps} from '../slice';
import type {MarkerOverlayPoint} from '../overlay/MarkerOverlayPoint';
import type {Stateful} from '../types';
import type {Printable} from 'tree-dump/lib/types';
import type {Peritext} from '../Peritext';
import type {Point} from '../rga/Point';
import type {PeritextMlElement} from './types';
/**
* A *fragment* represents a structural slice of a rich-text document. A
* fragment can be bound to a specific range of text contents, however it
* always constructs a tree of {@link Block}s, which represent the nested
* structure of the text contents.
*/
export class Fragment<T = string> extends Range<T> implements Printable, Stateful {
public readonly root: Block<T>;
constructor(
public readonly txt: Peritext<T>,
start: Point<T>,
end: Point<T>,
) {
super(txt.str, start, end);
this.root = new Block<T>(txt as Peritext<T>, [], void 0, start as Point<T>, end as Point<T>);
}
// ------------------------------------------------------------------- export
public toJson(): PeritextMlElement {
const node = this.root.toJson();
node[0] = '';
return node;
}
// ---------------------------------------------------------------- Printable
public toString(tab: string = ''): string {
return 'Fragment' + printTree(tab, [(tab) => this.root.toString(tab)]);
}
// ----------------------------------------------------------------- Stateful
public hash: number = 0;
public refresh(): number {
this.build();
return (this.hash = this.root.refresh());
}
private insertBlock(
parent: Block<T>,
path: SliceTypeSteps,
marker: undefined | MarkerOverlayPoint<T>,
end: Point<T> = this.end,
): Block<T> {
const txt = this.txt;
const common = commonLength(path, parent.path);
const start: Point<T> = marker ? marker : this.start;
while (parent.path.length > common && parent.parent) parent = parent.parent as Block<T>;
while (parent.path.length + 1 < path.length) {
const block = new Block<T>(txt, path.slice(0, parent.path.length + 1), void 0, start, end);
block.parent = parent;
parent.children.push(block);
parent = block;
}
const block = new LeafBlock<T>(txt, path, marker, start, end);
block.parent = parent;
parent.children.push(block);
return block;
}
protected build(): void {
const {root} = this;
root.children = [];
let parent = this.root;
const txt = this.txt;
const overlay = txt.overlay;
const iterator = overlay.markerPairs0(this.start, this.end);
let pair: ReturnType<typeof iterator>;
while ((pair = iterator())) {
const [p1, p2] = pair;
const skipFirstVirtualBlock = !p1 && this.start.isAbsStart() && p2 && p2.viewPos() === 0;
if (skipFirstVirtualBlock) continue;
const type = p1 ? p1.type() : CommonSliceType.p;
const path = type instanceof Array ? type : [type];
const block = this.insertBlock(parent, path, p1, p2);
if (block.parent) parent = block.parent;
}
}
}
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