// 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.Collections.Immutable;
using Microsoft.CodeAnalysis.Text;
using Xunit;
 
namespace Microsoft.CodeAnalysis.EditAndContinue.UnitTests;
 
public sealed class SyntaxMapDescription
{
    // Spans from <N:major:minor> markers. Indexed by major and then minor.
    public readonly ImmutableArray<ImmutableArray<TextSpan>> OldSpans;
    public readonly ImmutableArray<ImmutableArray<TextSpan>> NewSpans;
 
    public SyntaxMapDescription(string oldSource, string newSource)
    {
        OldSpans = SourceMarkers.GetNodeSpans(oldSource);
        NewSpans = SourceMarkers.GetNodeSpans(newSource);
 
        Assert.Equal(OldSpans.Length, NewSpans.Length);
        for (var i = 0; i < OldSpans.Length; i++)
        {
            Assert.Equal(OldSpans[i].Length, NewSpans[i].Length);
        }
    }
 
    internal ImmutableArray<(TextSpan oldSpan, TextSpan newSpan)> this[int i]
        => OldSpans[i].ZipAsArray(NewSpans[i], static (oldSpan, newSpan) => (oldSpan, newSpan));
}