// 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 System;
using System.Collections.Immutable;
using Microsoft.CodeAnalysis.Text;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.ExternalAccess.FSharp;
 
/// <summary>
/// Represents a <see cref="TextSpan"/> location in a <see cref="Document"/>.
/// </summary>
internal readonly struct FSharpDocumentSpan : IEquatable<FSharpDocumentSpan>
{
    public Document Document { get; }
    public TextSpan SourceSpan { get; }
 
    /// <summary>
    /// Additional information attached to a document span by it creator.
    /// </summary>
    public ImmutableDictionary<string, object> Properties { get; } = ImmutableDictionary<string, object>.Empty;
 
    public FSharpDocumentSpan(Document document, TextSpan sourceSpan)
    {
        Document = document;
        SourceSpan = sourceSpan;
    }
 
    public override bool Equals(object obj)
        => Equals((FSharpDocumentSpan)obj);
 
    public bool Equals(FSharpDocumentSpan obj)
        => this.Document == obj.Document && this.SourceSpan == obj.SourceSpan;
 
    public static bool operator ==(FSharpDocumentSpan d1, FSharpDocumentSpan d2)
        => d1.Equals(d2);
 
    public static bool operator !=(FSharpDocumentSpan d1, FSharpDocumentSpan d2)
        => !(d1 == d2);
 
    public override int GetHashCode()
        => Hash.Combine(
            this.Document,
            this.SourceSpan.GetHashCode());
 
    internal DocumentSpan ToRoslynDocumentSpan()
    {
        return new DocumentSpan(this.Document, this.SourceSpan);
    }
}