KeyValuePairHelper.cs

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// Copyright 2005-2015 Giacomo Stelluti Scala & Contributors. All rights reserved. See License.md in the project root for license information.
 
using System.Collections.Generic;
using System.Linq;
 
using CommandLine.Infrastructure;
 
using CSharpx;
 
namespace CommandLine.Core
{
    internal static class KeyValuePairHelper
    {
        public static IEnumerable<KeyValuePair<string, IEnumerable<string>>> ForSwitch(IEnumerable<Token> tokens)
        {
            return tokens.Select(t => t.Text.ToKeyValuePair("true"));
        }
 
        public static IEnumerable<KeyValuePair<string, IEnumerable<string>>> ForScalar(IEnumerable<Token> tokens)
        {
            return tokens
                   .Group(2)
                   .Select(g => g[0]
                                .Text.ToKeyValuePair(g[1].Text)
                          );
        }
 
        public static IEnumerable<KeyValuePair<string, IEnumerable<string>>> ForSequence(IEnumerable<Token> tokens)
        {
            return from t in tokens.Pairwise((f, s) =>
                                                 f.IsName()
                                                     ? f.Text.ToKeyValuePair(tokens.SkipWhile(t => !t.Equals(f))
                                                                                 .SkipWhile(t => t.Equals(f))
                                                                                 .TakeWhile(v => v.IsValue())
                                                                                 .Select(x => x.Text)
                                                                                 .ToArray()
                                                                            )
                                                     : string.Empty.ToKeyValuePair()
                                            )
                   where t.Key.Length > 0 && t.Value.Any()
                   select t;
        }
 
        private static KeyValuePair<string, IEnumerable<string>> ToKeyValuePair(
            this string value,
            params string[] values)
        {
            return new KeyValuePair<string, IEnumerable<string>>(value, values);
        }
    }
}