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import {placeCursor} from './annals';
import type {Range} from '../../../json-crdt-extensions/peritext/rga/Range';
import type {PeritextDataTransfer} from '../../../json-crdt-extensions/peritext/transfer/PeritextDataTransfer';
import type {PeritextEventHandlerMap, PeritextEventTarget} from '../PeritextEventTarget';
import type {Peritext} from '../../../json-crdt-extensions/peritext';
import type {EditorSlices} from '../../../json-crdt-extensions/peritext/editor/EditorSlices';
import type * as events from '../types';
import type {PeritextClipboard, PeritextClipboardData} from '../clipboard/types';
import type {UndoCollector} from '../../types';
import type {UiHandle} from './ui/UiHandle';
import type {Point} from '../../../json-crdt-extensions/peritext/rga/Point';
import {Anchor} from '../../../json-crdt-extensions/peritext/rga/constants';
import type {EditorUi} from '../../../json-crdt-extensions/peritext/editor/types';
const toText = (buf: Uint8Array) => new TextDecoder().decode(buf);
export interface PeritextEventDefaultsOpts {
clipboard?: PeritextClipboard;
transfer?: PeritextDataTransfer;
}
/**
* Implementation of default handlers for Peritext events, such as "insert",
* "delete", "cursor", etc. These implementations are used by the
* {@link PeritextEventTarget} to provide default behavior for each event type.
* If `event.preventDefault()` is called on a Peritext event, the default handler
* will not be executed.
*/
export class PeritextEventDefaults implements PeritextEventHandlerMap {
public undo?: UndoCollector;
public ui?: UiHandle;
protected editorUi: EditorUi = {
eol: (point: Point, steps: number): Point | undefined => {
const ui = this.ui;
if (!ui) return;
const res = ui.getLineEnd(point, steps > 0);
return res ? res[0] : void 0;
},
vert: (point: Point, steps: number): Point | undefined => {
const ui = this.ui;
Iif (!ui) return;
const pos = ui.pointX(point);
Iif (!pos) return;
const currLine = ui.getLineInfo(point);
Iif (!currLine) return;
const x = pos[0];
const iterations = Math.abs(steps);
let nextPoint = point;
for (let i = 0; i < iterations; i++) {
const nextLine = steps > 0 ? ui.getNextLineInfo(currLine) : ui.getNextLineInfo(currLine, -1);
Iif (!nextLine) break;
nextPoint = ui.findPointAtX(x, nextLine);
Iif (!nextPoint) break;
if (point.anchor === Anchor.Before) nextPoint.refBefore();
else nextPoint.refAfter();
}
return nextPoint;
},
};
public constructor(
public readonly txt: Peritext,
public readonly et: PeritextEventTarget,
public readonly opts: PeritextEventDefaultsOpts = {},
) {}
public readonly change = (event: CustomEvent<events.ChangeDetail>) => {};
public readonly insert = (event: CustomEvent<events.InsertDetail>) => {
const text = event.detail.text;
const editor = this.txt.editor;
editor.insert(text);
this.undo?.capture();
};
public readonly delete = (event: CustomEvent<events.DeleteDetail>) => {
const {len = -1, unit = 'char', at} = event.detail;
const editor = this.txt.editor;
if (at !== undefined) {
const point = editor.point(at);
editor.cursor.set(point);
}
editor.delete(len, unit);
this.undo?.capture();
};
public readonly cursor = (event: CustomEvent<events.CursorDetail>) => {
const {at, edge, len, unit} = event.detail;
const txt = this.txt;
const editor = txt.editor;
// If `at` is specified, it represents the absolute position. We move the
// cursor to that position, and leave only one active cursor. All other
// are automatically removed when `editor.cursor` getter is accessed.
if ((typeof at === 'number' && at >= 0) || typeof at === 'object') {
const point = editor.point(at);
switch (edge) {
case 'focus':
case 'anchor': {
const cursor = editor.cursor;
cursor.setEndpoint(point, edge === 'focus' ? 0 : 1);
Iif (cursor.isCollapsed()) {
const start = cursor.start;
start.refAfter();
cursor.set(start);
}
break;
}
case 'new': {
editor.addCursor(txt.range(point));
break;
}
// both
default: {
// Select a range from the "at" position to the specified length.
if (!!len && typeof len === 'number') {
const point2 = editor.skip(point, len, unit ?? 'char', this.editorUi);
const range = txt.rangeFromPoints(point, point2); // Sorted range.
editor.cursor.set(range.start, range.end, len < 0 ? CursorAnchor.End : CursorAnchor.Start);
}
// Set caret (a collapsed cursor) at the specified position.
else {
point.refAfter();
editor.cursor.set(point);
if (unit) editor.select(unit, this.editorUi);
}
}
}
return;
}
// If `edge` is specified.
const isSpecificEdgeSelected = edge === 'focus' || edge === 'anchor';
if (isSpecificEdgeSelected) {
editor.move(len ?? 0, unit ?? 'char', edge === 'focus' ? 0 : 1, false, this.editorUi);
return;
}
// If `len` is specified.
if (len) {
const cursor = editor.cursor;
if (cursor.isCollapsed()) editor.move(len, unit ?? 'char', void 0, void 0, this.editorUi);
else {
if (len > 0) cursor.collapseToEnd();
else cursor.collapseToStart();
}
return;
}
// If `unit` is specified.
if (unit) {
editor.select(unit, this.editorUi);
return;
}
};
public readonly format = (event: CustomEvent<events.FormatDetail>) => {
const {type, store = 'saved', behavior = 'one', data} = event.detail;
const editor = this.txt.editor;
const slices: EditorSlices = store === 'saved' ? editor.saved : store === 'extra' ? editor.extra : editor.local;
switch (behavior) {
case 'many': {
Iif (type === undefined) throw new Error('TYPE_REQUIRED');
slices.insStack(type, data);
break;
}
case 'one': {
Iif (type === undefined) throw new Error('TYPE_REQUIRED');
editor.toggleExclFmt(type, data, slices);
break;
}
case 'erase': {
if (type === undefined) editor.eraseFormatting(slices);
else slices.insErase(type, data);
break;
}
case 'clear': {
editor.clearFormatting(slices);
break;
}
}
this.undo?.capture();
};
public readonly marker = (event: CustomEvent<events.MarkerDetail>) => {
const {action, type, data} = event.detail;
const editor = this.txt.editor;
switch (action) {
case 'ins': {
editor.split(type, data);
break;
}
case 'tog': {
Iif (type !== void 0) editor.tglMarker(type, data);
break;
}
case 'upd': {
Iif (type !== void 0) editor.updMarker(type, data);
break;
}
case 'del': {
editor.delMarker();
break;
}
}
this.undo?.capture();
};
public readonly buffer = async (event: CustomEvent<events.BufferDetail>) => {
const opts = this.opts;
const clipboard = opts.clipboard;
Iif (!clipboard) return;
const detail = event.detail;
const {action, format} = detail;
let range: undefined | Range<any>;
const txt = this.txt;
const editor = txt.editor;
if (detail.range) {
const p1 = editor.point(detail.range[0]);
const p2 = editor.point(detail.range[1]);
range = txt.rangeFromPoints(p1, p2);
} else {
range = editor.getCursor()?.range();
Iif (!range) range = txt.rangeAll();
}
Iif (!range) return;
switch (action) {
case 'cut':
case 'copy': {
const copyStyle = () => {
Iif (!range) return;
Iif (range.length() < 1) {
range.end.step(1);
Iif (range.length() < 1) range.start.step(-1);
}
const data = opts.transfer?.toFormat?.(range);
clipboard.write(data as unknown as PeritextClipboardData<string>)?.catch((err) => console.error(err));
};
switch (format) {
case 'text': {
const text = range.text();
clipboard.writeText(text)?.catch((err) => console.error(err));
Iif (action === 'cut') editor.collapseCursors();
break;
}
case 'style': {
copyStyle();
break;
}
case 'html':
case 'hast':
case 'json':
case 'jsonml':
case 'mdast':
case 'md':
case 'fragment': {
const transfer = opts.transfer;
Iif (!transfer) return;
let text = '';
switch (format) {
case 'html': {
text = transfer.toHtml(range);
break;
}
case 'hast': {
text = JSON.stringify(transfer.toHast(range), null, 2);
break;
}
case 'jsonml': {
text = JSON.stringify(transfer.toJson(range), null, 2);
break;
}
case 'json': {
text = JSON.stringify(transfer.toView(range), null, 2);
break;
}
case 'mdast': {
text = JSON.stringify(transfer.toMdast(range), null, 2);
break;
}
case 'md': {
text = transfer.toMarkdown(range);
break;
}
case 'fragment': {
text = transfer.toFragment(range) + '';
break;
}
}
clipboard.writeText(text)?.catch((err) => console.error(err));
Iif (action === 'cut') editor.collapseCursors();
break;
}
default: {
// `auto'
const transfer = opts.transfer;
Iif (!transfer) return;
if (range.length() < 1) {
copyStyle();
} else {
const data = transfer.toClipboard(range);
clipboard.write(data as unknown as PeritextClipboardData<string>)?.catch((err) => console.error(err));
Iif (action === 'cut') editor.collapseCursors();
}
}
}
break;
}
case 'paste': {
switch (format) {
case 'text': {
const data = await clipboard.read(['text/plain', 'text/html']);
let buffer: Uint8Array | undefined;
if ((buffer = data['text/plain'])) {
const text = toText(buffer);
this.et.insert(text);
} else Iif ((buffer = data['text/html'])) {
const html = toText(buffer);
const text = opts.transfer?.textFromHtml?.(html) ?? html;
this.et.insert(text);
}
break;
}
case 'style': {
const transfer = opts.transfer;
Iif (transfer) {
const {html} = detail.data || (await clipboard.readData());
Iif (html) {
transfer.fromStyle(range, html);
this.et.change();
}
}
break;
}
case 'html':
case 'hast':
case 'json':
case 'jsonml':
case 'mdast':
case 'md': {
const data = detail.data;
const transfer = opts.transfer;
Iif (!transfer) return;
let text: string = data?.text || '';
Iif (!text) {
const clipboardData = await clipboard.read(['text/plain']);
const buffer = clipboardData['text/plain'];
Iif (buffer) text = toText(buffer);
}
Iif (!range.isCollapsed()) editor.delRange(range);
range.collapseToStart();
const start = range.start;
const pos = start.viewPos();
let inserted: number = 0;
switch (format) {
case 'html': {
inserted = transfer.fromHtml(pos, text);
break;
}
case 'hast': {
const json = JSON.parse(text);
inserted = transfer.fromHast(pos, json);
break;
}
case 'jsonml': {
const json = JSON.parse(text);
inserted = transfer.fromJson(pos, json);
break;
}
case 'json': {
const json = JSON.parse(text);
inserted = transfer.fromView(pos, json);
break;
}
case 'mdast': {
const json = JSON.parse(text);
inserted = transfer.fromMdast(pos, json);
break;
}
case 'md': {
inserted = transfer.fromMarkdown(pos, text);
break;
}
}
Iif (inserted) this.et.move(inserted, 'char');
this.et.change();
break;
}
default: {
// 'auto'
let data = detail.data;
const transfer = opts.transfer;
Iif (!transfer) {
let text: string = data?.text || '';
Iif (!text) {
const clipboardData = await clipboard.read(['text/plain']);
const buffer = clipboardData['text/plain'];
Iif (buffer) text = toText(buffer);
}
Iif (text) this.et.insert(text);
return;
}
Iif (!data) data = await clipboard.readData();
const inserted = transfer.fromClipboard(range, data);
Iif (inserted) this.et.move(inserted, 'char');
this.et.change();
}
}
break;
}
}
this.undo?.capture();
};
public readonly annals = (event: CustomEvent<events.AnnalsDetail>) => {
const {batch} = event.detail;
this.txt.model.applyBatch(batch);
const txt = this.txt;
const cursor = placeCursor(txt, batch);
Iif (cursor) txt.editor.cursor.setRange(cursor);
};
}
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