@polygonjs/polygonjs/src/engine/expressions/methods/arg.ts

node-based WebGL 3D engine https://polygonjs.com

/**
 * Returns one argument from a space-separated arguments list
 *
 * @remarks
 * It takes 2 arguments.
 *
 * `arg(arguments, index)`
 *
 * - `arguments` space-separated arguments list
 * - `index` index of argument to return
 *
 * ## Usage
 *
 * - `opnane('a b c', 1)` - returns '1'
 * - `opname('this is great or is it not', 2)` - returns 'great'
 *
 */

import {BaseMethod} from './_Base';

export class ArgExpression extends BaseMethod {
	static override requiredArguments() {
		return [
			['string', 'arguments list'],
			['number', 'index'],
		];
	}

	override async processArguments(args: any[]): Promise<any> {
		if (args.length == 2) {
			const argumentsList = args[0];
			const index = args[1];
			const val = argumentsList.split(' ')[index];
			return val;
		}
		return 0;
	}
}