Added support of one or more of choice clauses to EBNF parser:

[jlittorin]

[A | B | C]+

Resolves #160

[b3b00]

Great job @jlittorin !
Nevertheless when running unit tests on my computer (Linux mint 19.1, dotnet sdk 3.0.1) I get following output in console :

Outil en ligne de commande d'exécution de tests Microsoft (R), version 16.3.0
Copyright (c) Microsoft Corporation. Tous droits réservés.

Démarrage de l'exécution de tests, patientez...

Au total, 1 fichiers de test ont correspondu au modèle spécifié.
ERROR : Unable to cast object of type 'System.Double' to type 'System.Int32'. calling primary_value =>  OperandInt
ERROR : Parameter count mismatch. calling operand =>  OperandValue
ERROR : Unable to cast object of type 'System.Double' to type 'System.Int32'. calling primary_value =>  OperandInt
ERROR : Parameter count mismatch. calling operand =>  OperandValue
ERROR : Parameter count mismatch. calling expr_10_PLUS_MINUS =>  BinaryTermExpression
1
1
2

Do you also have those ERROR messages. I do not have them when running tests on my repo (branch dev).
Could you check please ?

I can see it on appveyor ubuntu build so it surely is a linux dotnet issue.

thanks anyway.

[jlittorin]

The test runner in visual studio doesn't show this output, I guess I relied on that and all tests passing before I created the PR. The "parameter count mismatch" does look like something I could have caused though. I'll look into it.

[jlittorin]

These problems were unrelated to my PR, they appeared in commit 137b304. Putting up a fix in a new PR.