// 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.Collections.Generic;
using System.Linq;
using System.Threading;
 
namespace Microsoft.CodeAnalysis.Shared.Utilities
{
    internal partial class SemanticMap
    {
        private readonly Dictionary<SyntaxNode, SymbolInfo> _expressionToInfoMap =
            new();
 
        private readonly Dictionary<SyntaxToken, SymbolInfo> _tokenToInfoMap =
            new();
 
        private SemanticMap()
        {
        }
 
        internal static SemanticMap From(SemanticModel semanticModel, SyntaxNode node, CancellationToken cancellationToken)
        {
            var map = new SemanticMap();
            var walker = new Walker(semanticModel, map, cancellationToken);
            walker.Visit(node);
            return map;
        }
 
        public IEnumerable<ISymbol> AllReferencedSymbols
        {
            get
            {
                return _expressionToInfoMap.Values.Concat(_tokenToInfoMap.Values).Select(info => info.Symbol).Distinct();
            }
        }
    }
}