See GlycoDeNovo - an Efficient Algorithm for Accurate de novo Glycan Topology Reconstruction from Tandem Mass Spectra. (https://www.ncbi.nlm.nih.gov/pubmed/28786094) for details regarding this algorithm.
We are integrating this plug-in into the Grits Toolbox (http://www.grits-toolbox.org). This repository contains code for our plug-in. It depends on Grits-Toolbox to run. If you want to use the command-line version, you could find it at https://github.com/hongpengyu/GlycoDeNovo.