// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
#nullable disable
 
using Microsoft.CodeAnalysis.PooledObjects;
 
namespace Microsoft.CodeAnalysis.Shared.Extensions;
 
internal static class SyntaxTokenListExtensions
{
    /// <summary>
    /// Gets the concatenated value text for the token list.
    /// </summary>
    /// <returns>The concatenated value text, or an empty string if there are no tokens in the list.</returns>
    internal static string GetValueText(this SyntaxTokenList tokens)
    {
        switch (tokens.Count)
        {
            case 0:
                return string.Empty;
 
            case 1:
                return tokens[0].ValueText;
 
            default:
                var pooledBuilder = PooledStringBuilder.GetInstance();
                foreach (var token in tokens)
                {
                    pooledBuilder.Builder.Append(token.ValueText);
                }
 
                return pooledBuilder.ToStringAndFree();
        }
    }
}