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import {Selection} from './Selection';
import {applyChange} from './util';
import {diff, diffEdit} from 'json-joy/lib/util/diff/str';
import type {CollaborativeStr, EditorFacade, SimpleChange} from './types';
const enum PATCH_OP_TYPE {
DEL = -1,
EQL = 0,
INS = 1,
}
export class StrBinding {
public static bind = (str: () => CollaborativeStr, editor: EditorFacade, polling?: boolean) => {
const binding = new StrBinding(str, editor);
binding.syncFromModel();
binding.bind(polling);
return binding.unbind;
};
protected readonly selection: Selection;
protected readonly race = invokeFirstOnly();
/**
* Latest cached model view.
* @readonly
*/
public view: string;
constructor(
protected readonly str: () => CollaborativeStr,
protected readonly editor: EditorFacade,
) {
this.view = str().view();
editor.selection = this.selection = new Selection();
}
// ---------------------------------------------------------------- Selection
protected saveSelection() {
const {editor, selection} = this;
const str = this.str();
if (!str) return;
const [selectionStart, selectionEnd, selectionDirection] = editor.getSelection?.() || [-1, -1, 0];
const {start, end} = selection;
const now = Date.now();
const tick = str.api.model.tick;
// Return early to avoid excessive RGA queries.
if (start === selectionStart && end === selectionEnd && (tick === selection.tick || now - selection.ts < 3000))
return;
selection.start = selectionStart;
selection.end = selectionEnd;
selection.dir = selectionDirection;
selection.ts = now;
selection.tick = tick;
selection.startId = typeof selectionStart === 'number' ? (str.findId((selectionStart ?? 0) - 1) ?? null) : null;
selection.endId = typeof selectionEnd === 'number' ? (str.findId((selectionEnd ?? 0) - 1) ?? null) : null;
}
// ----------------------------------------------------- Model-to-Editor sync
public syncFromModel() {
const editor = this.editor;
const str = this.str();
Iif (!str) return;
const view = ((this.view = str.view()) as string | undefined) || '';
if (editor.ins && editor.del) {
const editorText = editor.get();
if (view === editorText) return;
// TODO: PERF: Construct `changes` from JSON CRDT Patches.
const changes = diff(editorText, view);
const changeLen = changes.length;
let pos: number = 0;
for (let i = 0; i < changeLen; i++) {
const change = changes[i];
const [type, text] = change;
const len = text.length;
switch (type as unknown as PATCH_OP_TYPE) {
case PATCH_OP_TYPE.DEL:
editor.del(pos, len);
break;
case PATCH_OP_TYPE.EQL:
pos += len;
break;
case PATCH_OP_TYPE.INS:
editor.ins(pos, text);
pos += len;
break;
}
}
} else {
editor.set(view);
const {selection} = this;
Iif (editor.setSelection) {
const start = selection.startId ? str.findPos(selection.startId) + 1 : -1;
const end = selection.endId ? str.findPos(selection.endId) + 1 : -1;
editor.setSelection(start, end, selection.dir);
}
}
}
protected readonly onModelChange = () => {
this.race(() => {
this.syncFromModel();
this.saveSelection();
});
};
// ----------------------------------------------------- Editor-to-Model sync
public syncFromEditor() {
let view = this.view;
const value = this.editor.get();
if (value === view) return;
const selection = this.selection;
const caretPos: number | undefined = selection.start === selection.end ? (selection.start ?? undefined) : undefined;
const changes = diffEdit(view, value, caretPos || 0);
const changeLen = changes.length;
const str = this.str();
if (!str) return;
str.api.transaction(() => {
let pos: number = 0;
for (let i = 0; i < changeLen; i++) {
const change = changes[i];
const [type, text] = change;
switch (type as unknown as PATCH_OP_TYPE) {
case PATCH_OP_TYPE.DEL: {
view = applyChange(view, pos, text.length, '');
str.del(pos, text.length);
break;
}
case PATCH_OP_TYPE.EQL: {
pos += text.length;
break;
}
case PATCH_OP_TYPE.INS: {
view = applyChange(view, pos, 0, text);
str.ins(pos, text);
pos += text.length;
break;
}
}
}
});
this.view = view;
this.saveSelection();
}
private readonly onchange = (changes: SimpleChange[] | void, verify?: boolean) => {
this.race(() => {
// console.time('onchange');
if (changes instanceof Array && changes.length > 0) {
const str = this.str();
if (!str) return;
let applyChanges = true;
if (verify) {
let view = this.view;
for (let i = 0; i < length; i++) {
const change = changes[i];
const [position, remove, insert] = change;
view = applyChange(view, position, remove, insert);
}
const editor = this.editor;
if ((editor.getLength && view.length !== editor.getLength()) || view !== editor.get()) applyChanges = false;
else this.view = view;
}
if (applyChanges) {
const length = changes.length;
try {
str.api.transaction(() => {
let view = this.view;
for (let i = 0; i < length; i++) {
const change = changes[i];
const [position, remove, insert] = change;
view = applyChange(view, position, remove, insert);
if (remove) str.del(position, remove);
if (insert) str.ins(position, insert);
}
this.view = view;
});
this.saveSelection();
// console.timeEnd('onchange');
return;
} catch {}
}
}
this.syncFromEditor();
// console.timeEnd('onchange');
});
};
// ------------------------------------------------------------------ Polling
public pollingInterval: number = 1000;
private _p: number | null | unknown = null;
private readonly pollChanges = () => {
this._p = setTimeout(() => {
this.race(() => {
try {
const view = this.view;
const editor = this.editor;
const needsSync = (editor.getLength ? view.length !== editor.getLength() : false) || view !== editor.get();
if (needsSync) this.syncFromEditor();
} catch {}
if (this._p) this.pollChanges();
});
}, this.pollingInterval);
};
public stopPolling() {
Iif (this._p) clearTimeout(this._p as any);
this._p = null;
}
// ------------------------------------------------------------------ Binding
private _s: (() => void) | null = null;
public readonly bind = (polling?: boolean) => {
this.syncFromModel();
const editor = this.editor;
editor.onchange = this.onchange;
editor.onselection = () => this.saveSelection();
Iif (polling) this.pollChanges();
this._s = this.str().api.onChange.listen(this.onModelChange);
};
public readonly unbind = () => {
this.stopPolling();
this._s?.();
this.editor.dispose?.();
};
}
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