BnfTermExtensions.Helpers.cs

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// Copyright (c) 2014 Silicon Studio Corp. (http://siliconstudio.co.jp)
// This file is distributed under GPL v3. See LICENSE.md for details.
using Irony.Parsing;

namespace SiliconStudio.Shaders.Grammar
{
    /// <summary>
    /// Extensions to BnfTerm.
    /// </summary>
    public static class BnfTermExtensions
    {
        /// <summary>
        /// Makes a non terminal optional.
        /// </summary>
        /// <param name="term">The term.</param>
        /// <returns>An optional non terminal.</returns>
        public static NonTerminal Opt(this BnfTerm term)
        {
            var nonTerminal = term.Q();
            nonTerminal.SetFlag(TermFlags.NoAstNode);
            return nonTerminal;
        }

        /// <summary>
        /// Makes a list of non terminals.
        /// </summary>
        /// <param name="term">The term.</param>
        /// <returns>A list of non temrinal</returns>
        public static NonTerminal List(this BnfTerm term)
        {
            var nonTerminal = term.Plus();
            nonTerminal.SetFlag(TermFlags.NoAstNode);
            return nonTerminal;
        }

        /// <summary>
        /// Makes an optional list of non terminals.
        /// </summary>
        /// <param name="term">The term.</param>
        /// <returns>An optional list of non terminals.</returns>
        public static NonTerminal ListOpt(this BnfTerm term)
        {
            var nonTerminal = term.Star();
            nonTerminal.SetFlag(TermFlags.NoAstNode);
            return nonTerminal;
        }
    }
}