63 lines
1.5 KiB
TypeScript
63 lines
1.5 KiB
TypeScript
import { Update } from "@codemirror/collab";
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import { Text } from "@codemirror/state";
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import { Socket } from "socket.io";
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import { Cursor } from "../webapp/cursorEffect";
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export class ClientPageState {
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constructor(public socket: Socket, public version: number) {}
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}
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export type PageMeta = {
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name: string;
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lastModified: number;
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version?: number;
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};
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export class Page {
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versionOffset = 0;
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updates: Update[] = [];
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cursors = new Map<string, Cursor>();
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clientStates = new Set<ClientPageState>();
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pending: ((value: any) => void)[] = [];
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text: Text;
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meta: PageMeta;
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saveTimer: NodeJS.Timeout | undefined;
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name: string;
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constructor(name: string, text: string, meta: PageMeta) {
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this.name = name;
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this.text = Text.of(text.split("\n"));
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this.meta = meta;
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}
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updatesSince(version: number): Update[] {
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return this.updates.slice(version - this.versionOffset);
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}
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get version(): number {
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return this.updates.length + this.versionOffset;
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}
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flushUpdates(version: number) {
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if (this.versionOffset > version) {
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throw Error("This should never happen");
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}
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if (this.versionOffset === version) {
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return;
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}
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this.updates = this.updates.slice(version - this.versionOffset);
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this.versionOffset = version;
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// console.log("Flushed updates, now got", this.updates.length, "updates");
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}
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toJSON() {
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return {
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text: this.text,
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version: this.version,
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cursors: Object.fromEntries(this.cursors.entries()),
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};
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}
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}
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