CoNLL-U Parser in .NET Core

This repository contains a lightweight, well-tested CoNLL-U parser written in C# .NET Core and parses according to the CoNLL-U format as specified by Universal Dependencies.

Quick Start

CoNLL-U is available as a NuGet package. Once installed, you can start as follows:

var filePath = ...
var sentences = ConlluParser.ParseFile(filePath);

Each Sentence contains a list of Token which contain all the information as specified in the CoNLL-U format. Below is a short overview of some of the fields that are available in the Token class:

public class Token
{
    // CoNLL-U Properties
    int Id;
    string Form;
    string Lemma;
    string Upos;
    string Xpos;
    Dictionary<string, string> Feats;
    int? Head;
    string DepRel;
    Dictionary<TokenIdentifier, string> Deps;
    string Misc;
    
    // Other properties
    TokenIdentifier Identifier;
    string RawLine;
    bool IsMultiwordToken;
    bool IsEmptyNode;
}

In addition, there is a TokenIdentifier class which wraps the different possibilities for word ID such as multi word tokens or empty nodes.

You can also serialize a Sentence back into a CoNLL-U file format. You can simply do this as follows:

Sentence s;
var text =  ConlluParser.Serialize(s);
System.IO.File.WriteAllText(@"C:\path\to\file.conllu", text);

To-do

Below is a list of items that are still planned for the package. Feel free to open an issue or pull request for any other additional functionalities and/or bugfixes.

• Support empty nodes
• Add serialization support to generate .conllu files
• Add tree parsing helper functions

License

Copyright (c) 2021 Arthur Hemmer

Distributed under the MIT License (MIT).