Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import {CONST, updateJson, updateNum} from '../../../json-hash';
import {MarkerOverlayPoint} from '../overlay/MarkerOverlayPoint';
import {UndefEndIter, type UndefIterator} from '../../../util/iterator';
import {Inline} from './Inline';
import {formatType} from '../slice/util';
import {Range} from '../rga/Range';
import type {Point} from '../rga/Point';
import type {OverlayPoint} from '../overlay/OverlayPoint';
import type {Printable} from 'tree-dump';
import type {Peritext} from '../Peritext';
import type {Stateful} from '../types';
import type {OverlayTuple} from '../overlay/types';
import type {PeritextMlAttributes, PeritextMlElement} from './types';
import type {SliceTypeSteps} from '../slice';
export interface IBlock {
readonly path: SliceTypeSteps;
readonly parent: IBlock | null;
}
export class Block<T = string, Attr = unknown> extends Range<T> implements IBlock, Printable, Stateful {
public parent: Block<T> | null = null;
public children: Block<T>[] = [];
constructor(
public readonly txt: Peritext<T>,
public readonly path: SliceTypeSteps,
public readonly marker: MarkerOverlayPoint<T> | undefined,
public start: Point<T>,
public end: Point<T>,
) {
super(txt.str, start, end);
}
/**
* @returns Stable unique identifier within a list of blocks. Used for React
* or other rendering library keys.
*/
public key(): number | string {
Iif (!this.marker) return this.tag();
const id = this.marker.id;
return id.sid.toString(36) + id.time.toString(36);
}
public tag(): number | string {
const path = this.path;
const length = path.length;
if (!length) return '';
const step = path[length - 1];
return Array.isArray(step) ? step[0] : step;
}
public attr(): Attr | undefined {
return this.marker?.data() as Attr | undefined;
}
public isLeaf(): boolean {
return false;
}
/**
* Iterate through all overlay points of this block, until the next marker
* (regardless if that marker is a child or not).
*/
public points0(withMarker: boolean = false): UndefIterator<OverlayPoint<T>> {
const txt = this.txt;
const overlay = txt.overlay;
const iterator = overlay.points0(this.marker);
let closed = false;
return () => {
if (withMarker) {
withMarker = false;
return this.marker ?? overlay.START;
}
Iif (closed) return;
const point = iterator();
if (!point) return;
if (point instanceof MarkerOverlayPoint) {
closed = true;
return;
}
return point;
};
}
public points(withMarker?: boolean): IterableIterator<OverlayPoint<T>> {
return new UndefEndIter(this.points0(withMarker));
}
protected tuples0(): UndefIterator<OverlayTuple<T>> {
const overlay = this.txt.overlay;
const marker = this.marker;
const iterator = overlay.tuples0(marker);
let closed = false;
return () => {
if (closed) return;
let pair = iterator();
while (!marker && pair && pair[1] && pair[1].cmpSpatial(this.start) < 0) pair = iterator();
if (!pair) return (closed = true), void 0;
if (!pair[1] || pair[1] instanceof MarkerOverlayPoint) closed = true;
return pair;
};
}
/**
* @todo Consider moving inline-related methods to {@link LeafBlock}.
*/
public texts0(): UndefIterator<Inline<T>> {
const txt = this.txt;
const iterator = this.tuples0();
const start = this.start;
const end = this.end;
const startIsMarker = txt.overlay.isMarker(start.id);
const endIsMarker = txt.overlay.isMarker(end.id);
let isFirst = true;
let next = iterator();
let closed = false;
return () => {
if (closed) return;
const pair = next;
next = iterator();
if (!pair) return;
const [overlayPoint1, overlayPoint2] = pair;
let point1: Point<T> = overlayPoint1;
let point2: Point<T> = overlayPoint2;
if (isFirst) {
isFirst = false;
if (start.cmpSpatial(overlayPoint1) > 0) point1 = start;
if (startIsMarker) {
point1 = point1.clone();
point1.step(1);
}
}
if (!endIsMarker && end.cmpSpatial(overlayPoint2) < 0) {
closed = true;
point2 = end;
}
return new Inline(txt, overlayPoint1, overlayPoint2, point1, point2);
};
}
/**
* @todo Consider moving inline-related methods to {@link LeafBlock}.
*/
public texts(): IterableIterator<Inline<T>> {
return new UndefEndIter(this.texts0());
}
public text(): string {
let str = '';
const children = this.children;
const length = children.length;
for (let i = 0; i < length; i++) str += children[i].text();
return str;
}
// ------------------------------------------------------------------- export
public toJson(): PeritextMlElement {
const data = this.attr();
const attr: PeritextMlAttributes | null = data !== void 0 ? {data} : null;
const node: PeritextMlElement = [this.tag(), attr];
const children = this.children;
const length = children.length;
for (let i = 0; i < length; i++) node.push(children[i].toJson());
return node;
}
// ----------------------------------------------------------------- Stateful
public hash: number = 0;
public refresh(): number {
const {path, children} = this;
let state = CONST.START_STATE;
state = updateJson(state, path);
const marker = this.marker;
if (marker) {
state = updateNum(state, marker.marker.refresh());
state = updateNum(state, marker.textHash);
} else {
state = updateNum(state, this.txt.overlay.leadingTextHash);
}
for (let i = 0; i < children.length; i++) state = updateNum(state, children[i].refresh());
return (this.hash = state);
}
// ---------------------------------------------------------------- Printable
public toStringName(): string {
return 'Block';
}
protected toStringHeader(): string {
const hash = `#${this.hash.toString(36).slice(-4)}`;
const tag = this.path.map((step) => formatType(step)).join('.');
const header = `${super.toString('', true)} ${hash} ${tag} `;
return header;
}
public toString(tab: string = ''): string {
const header = this.toStringHeader();
const hasChildren = !!this.children.length;
return (
header +
printTree(tab, [
this.marker ? (tab) => this.marker!.toString(tab) : null,
this.marker && hasChildren ? () => '' : null,
hasChildren
? (tab) =>
'children' +
printTree(
tab,
this.children.map(
(child, i) => (tab) => `${i + 1}. ` + child.toString(tab + ' ' + ' '.repeat(String(i + 1).length)),
),
)
: null,
])
);
}
}
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