// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

#nullable disable

using System;

namespace Microsoft.AspNetCore.Razor.Language.Legacy;

// Flags:
//  Provisional, ContextChanged, Accepted, Rejected
//  000001 1  - Rejected,
//  000010 2  - Accepted
//  000100 4  - Provisional
//  001000 8  - Context Changed
//  010000 16 - Auto Complete Block

/// <summary>
/// The result of attempting an incremental parse
/// </summary>
/// <remarks>
/// Either the Accepted or Rejected flag is ALWAYS set.
/// Additionally, Provisional may be set with Accepted and SpanContextChanged may be set with Rejected.
/// Provisional may NOT be set with Rejected and SpanContextChanged may NOT be set with Accepted.
/// </remarks>
[Flags]
internal enum PartialParseResultInternal
{
    /// <summary>
    /// Indicates that the edit could not be accepted and that a reparse is underway.
    /// </summary>
    Rejected = 1,

    /// <summary>
    /// Indicates that the edit was accepted and has been added to the parse tree
    /// </summary>
    Accepted = 2,

    /// <summary>
    /// Indicates that the edit was accepted, but that a reparse should be forced when idle time is available
    /// since the edit may be misclassified
    /// </summary>
    /// <remarks>
    /// This generally occurs when a "." is typed in an Implicit Expression, since editors require that this
    /// be assigned to Code in order to properly support features like IntelliSense.  However, if no further edits
    /// occur following the ".", it should be treated as Markup.
    /// </remarks>
    Provisional = 4,

    /// <summary>
    /// Indicates that the edit caused a change in the span's context and that if any statement completions were active prior to starting this
    /// partial parse, they should be reinitialized.
    /// </summary>
    SpanContextChanged = 8,

    /// <summary>
    /// Indicates that the edit requires an auto completion to occur
    /// </summary>
    AutoCompleteBlock = 16
}