// 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.

using System;
using System.Collections.Generic;
using System.IO;
using Microsoft.CodeAnalysis.PooledObjects;

namespace Microsoft.CodeAnalysis.MetadataAsSource;

internal static class DocumentationCommentUtilities
{
    private static readonly ObjectPool<List<string>> s_pool = SharedPools.Default<List<string>>();

    public static string ExtractXMLFragment(string input, string docCommentPrefix)
    {
        using var reader = new StringReader(input);
        using var list = s_pool.GetPooledObject();
        while (reader.ReadLine() is string str)
        {
            str = str.TrimStart();
            if (str.StartsWith(docCommentPrefix, StringComparison.Ordinal))
            {
                str = str[docCommentPrefix.Length..];
            }

            list.Object.Add(str);
        }

        return string.Join("\r\n", list.Object);
    }
}