// 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 Microsoft.CodeAnalysis.Formatting.Rules;

namespace Microsoft.CodeAnalysis.CSharp.Formatting
{
    internal class EndOfFileTokenFormattingRule : BaseFormattingRule
    {
        internal const string Name = "CSharp End Of File Token Formatting Rule";

        public override AdjustNewLinesOperation? GetAdjustNewLinesOperation(in SyntaxToken previousToken, in SyntaxToken currentToken, in NextGetAdjustNewLinesOperation nextOperation)
        {
            // * <End Of File> case for C#, make sure we don't insert new line between * and <End of
            // File> tokens.
            if (currentToken.Kind() == SyntaxKind.EndOfFileToken)
            {
                return CreateAdjustNewLinesOperation(0, AdjustNewLinesOption.PreserveLines);
            }

            return nextOperation.Invoke(in previousToken, in currentToken);
        }

        public override AdjustSpacesOperation? GetAdjustSpacesOperation(in SyntaxToken previousToken, in SyntaxToken currentToken, in NextGetAdjustSpacesOperation nextOperation)
        {
            // * <End Of File) case
            // for C#, make sure we have nothing between these two tokens
            if (currentToken.Kind() == SyntaxKind.EndOfFileToken)
            {
                return CreateAdjustSpacesOperation(0, AdjustSpacesOption.ForceSpacesIfOnSingleLine);
            }

            return nextOperation.Invoke(in previousToken, in currentToken);
        }
    }
}
