// 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.Threading;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Simplification.Simplifiers;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.PooledObjects;
using Microsoft.CodeAnalysis.Simplification;
 
namespace Microsoft.CodeAnalysis.CSharp.Simplification
{
    internal partial class CSharpCastReducer : AbstractCSharpReducer
    {
        private static readonly ObjectPool<IReductionRewriter> s_pool = new(
            () => new Rewriter(s_pool));
 
        public CSharpCastReducer() : base(s_pool)
        {
        }
 
        protected override bool IsApplicable(CSharpSimplifierOptions options)
            => true;
 
        private static readonly Func<CastExpressionSyntax, SemanticModel, SimplifierOptions, CancellationToken, ExpressionSyntax> s_simplifyCast = SimplifyCast;
 
        private static ExpressionSyntax SimplifyCast(CastExpressionSyntax node, SemanticModel semanticModel, SimplifierOptions options, CancellationToken cancellationToken)
        {
            if (!CastSimplifier.IsUnnecessaryCast(node, semanticModel, cancellationToken))
            {
                return node;
            }
 
            return node.Uncast();
        }
    }
}