11 unstable releases (5 breaking)

0.6.0 Jul 18, 2023
0.4.0 Sep 17, 2021
0.3.4 Mar 11, 2021
0.3.2 Aug 29, 2020
0.2.1 Nov 4, 2018

#2858 in Parser implementations

Used in 2 crates


986 lines


A library for interacting with files in the Les Houches Event File (LHEF) format.

Lhef supports both reading and writing via the Reader and Writer structs. Information about the generator run is provided in a HEPRUP object and each event is stored in a HEPEUP object. These structs correspond to the Fortran common blocks of the same names in the original proposal, but contain extra info fields corresponding to the "optional information" specified in the LHEF standard.

As of now, only version 1.0 of the LHEF format is fully supported. Files in version 2.0 and 3.0 are parsed exactly like for version 1.0. This means that the additional XML tags have to be extracted manually from the info fields of the HEPRUP and HEPEUP objects.


use lhef::Reader;
use std::fs::File;
use std::io::BufReader;

let input = BufReader::new(File::open("events.lhe")?);

let mut reader = Reader::new(input)?;

println!("Information in comment header:\n{}", reader.header());
println!("Information in xml header:\n{:?}", reader.xml_header());
println!("Generator run information:\n{:?}", reader.heprup());

let event = reader.hepeup()?;
if let Some(event) = event {
    println!("Found an event: {:?}", event);

License: GPL-3.0-or-later


~37K SLoC