import { openFile } from "https://root.cern/js/latest/modules/main.mjs";
import { TSelector, treeProcess } from "https://root.cern/js/latest/modules/tree.mjs";

class MySelector extends TSelector {

	constructor() {
		super();
		this.entry = 0;

		// add branches
		this.addBranch('px');
		this.addBranch('p');
	}

	Begin() {
		this.entry = 0;
	}

	Process() {
		if (this.entry < 1) {
			console.log(this);
			console.log(this.tgtobj.px, this.tgtobj.p);
			console.log(typeof(this.tgtobj.px));
		}
		++this.entry;
	}

	Terminate() {}
}

const file = await openFile('./example.root');
const tree = await file.readObject('tree;1');

treeProcess(tree, new MySelector);