// 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 System;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.CodeGeneration;
 
internal static class SyntaxAnnotationExtensions
{
    public static TSymbol AddAnnotationToSymbol<TSymbol>(
        this SyntaxAnnotation annotation,
        TSymbol symbol)
        where TSymbol : ISymbol
    {
        Contract.ThrowIfFalse(symbol is CodeGenerationSymbol);
        var codeGenSymbol = (CodeGenerationSymbol)(object)symbol;
        return (TSymbol)(object)codeGenSymbol.WithAdditionalAnnotations(annotation);
    }
 
    internal static SyntaxAnnotation[] CombineAnnotations(
        SyntaxAnnotation[] originalAnnotations,
        SyntaxAnnotation[] newAnnotations)
    {
        if (!originalAnnotations.IsNullOrEmpty())
        {
            // Make a new array (that includes the new annotations) and copy the original
            // annotations into it.
            var finalAnnotations = newAnnotations;
            Array.Resize(ref finalAnnotations, originalAnnotations.Length + newAnnotations.Length);
            Array.Copy(originalAnnotations, 0, finalAnnotations, newAnnotations.Length, originalAnnotations.Length);
 
            return finalAnnotations;
        }
 
        return newAnnotations;
    }
}