Utils.cs

// This file is part of the DSharpPlus project.
//
// Copyright (c) 2015 Mike Santiago
// Copyright (c) 2016-2022 DSharpPlus Contributors
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

using System;
using System.Collections.Generic;
using System.Linq;

namespace DSharpPlusDocs
{
    public static class Utils
    {
        public static IEnumerable<T> RandomShuffle<T>(this IEnumerable<T> source) => source.Select(t => new { Index = Guid.NewGuid(), Value = t }).OrderBy(p => p.Index).Select(p => p.Value);

        public static string BuildType(Type type)
        {
            string typeName = type.Name, typeGeneric = "";
            int idx;
            if ((idx = typeName.IndexOf('`')) != -1)
            {
                typeName = typeName[..idx];
                Type[] generics = type.GetGenericArguments();
                if (generics.Any())
                {
                    typeGeneric = string.Join(", ", generics.Select(x => BuildType(x)));
                }
            }
            return GetTypeName(type, typeName, typeGeneric);
        }

        private static string GetTypeName(Type type, string name, string generic) => Nullable.GetUnderlyingType(type) != null
                ? $"{generic}?"
                : type.IsByRef
                ? BuildType(type.GetElementType())
                : Aliases.ContainsKey(type) ? Aliases[type] : $"{name}{(string.IsNullOrEmpty(generic) ? "" : $"<{generic}>")}";

        private static readonly Dictionary<Type, string> Aliases = new()
        {
            { typeof(byte), "byte" },
            { typeof(sbyte), "sbyte" },
            { typeof(short), "short" },
            { typeof(ushort), "ushort" },
            { typeof(int), "int" },
            { typeof(uint), "uint" },
            { typeof(long), "long" },
            { typeof(ulong), "ulong" },
            { typeof(float), "float" },
            { typeof(double), "double" },
            { typeof(decimal), "decimal" },
            { typeof(object), "object" },
            { typeof(bool), "bool" },
            { typeof(char), "char" },
            { typeof(string), "string" },
            { typeof(void), "void" }
        };
    }
}