Parser combinators and utilities for GoldSrc demo files.

‼️ If you're looking for the demo file documentation, it is located here. ‼️

@cgdangelo/talent-parser-goldsrc is published to NPM. Install with your package manager (pnpm, npm, yarn) of choice:

npm install @cgdangelo/talent-parser-goldsrc

import { readFile } from "fs/promises";
import { parseDemo } from "@cgdangelo/talent-parser-goldsrc";

const fileContents = await readFile('./demo.dem');
const demo = parseDemo(fileContents); // Demo | undefined

Demos take quite a while to process, and the final parse result is not exactly tiny. A 20-minute demo can represent several hundred megabytes of JSON data.

To alleviate this, the parser combinator allows for an event bus implementation to be provided so that data can be emitted as the file is evaluated, instead of waiting for the full parsing to complete.

See @cgdangelo/talent-demo-analyzer application for more.

import { EventEmitter } from "events";
import { readFile } from "fs/promises";
import { parseDemo } from "@cgdangelo/talent-parser-goldsrc";

const demoEvents = new EventEmitter();

demoEvents.on('demo:frame', frame => console.log(frame));

const fileContents = await readFile('./demo.dem');

parseDemo(fileContents, demoEvents);

If you are working on a project within the fp-ts ecosystem, @cgdangelo/talent-parser-goldsrc exports a demo combinator constructor built with parser-ts. You should be able to use the combinator in your application the same way this library does.

See @cgdangelo/talent-demo-to-json application for more.

Similarly, the goldsrcParserIO and goldsrcParserEither constructors return instances that you can manipulate with IO.map, Either.chain, and so on.