interpreter/index.js
function step(inst, raw, argv, event, fin) {
    if (!_isPresent(raw)) return fin(_wrapError(_badInput(inst), inst, raw), null);
    var flat = _denestList(raw);
    preproc(inst, flat, argv, event, function postPreproc(err, data) {
        if (err) return fin(err);
        var list = _safeObject(data);
        return branch(inst, list, argv, event, fin);
    });
}
function step(inst, raw, argv, event, fin) {
    if (!_isPresent(raw)) return fin(_wrapError(_badInput(inst), inst, raw), null);
    var flat = _denestList(raw);
    preproc(inst, flat, argv, event, function postPreproc(err, data) {
        if (err) return fin(err);
        var list = _safeObject(data);
        return branch(inst, list, argv, event, fin);
    });
}
function step ( inst , raw , argv , event , fin ) { if ( ! _isPresent ( raw ) ) return fin ( _wrapError ( _badInput ( inst ) , inst , raw ) , null ) ; var flat = _denestList ( raw ) ; preproc ( inst , flat , argv , event , function postPreproc ( err , data ) { if ( err ) return fin ( err ) ; var list = _safeObject ( data ) ; return branch ( inst , list , argv , event , fin ) ; } ) ; }
Perform one step of execution to the given list, and return the AST.
Perform one step of execution to the given list and return the AST .