// 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
 
namespace Microsoft.CodeAnalysis.Structure;
 
internal static class BlockTypes
{
    // Basic types.
    public const string Nonstructural = nameof(Nonstructural);
 
    // Trivia
    public const string Comment = nameof(Comment);
    public const string PreprocessorRegion = nameof(PreprocessorRegion);
 
    // Top level declarations.
    public const string Imports = nameof(Imports);
    public const string Namespace = nameof(Namespace);
    public const string Type = nameof(Type);
    public const string Member = nameof(Member);
 
    // Statements and expressions.
    public const string Statement = nameof(Statement);
    public const string Conditional = nameof(Conditional);
    public const string Loop = nameof(Loop);
 
    public const string Expression = nameof(Expression);
 
    internal static bool IsCommentOrPreprocessorRegion(string type)
    {
        switch (type)
        {
            case Comment:
            case PreprocessorRegion:
                return true;
        }
 
        return false;
    }
 
    internal static bool IsExpressionLevelConstruct(string type)
        => type == Expression;
 
    internal static bool IsStatementLevelConstruct(string type)
    {
        switch (type)
        {
            case Statement:
            case Conditional:
            case Loop:
                return true;
        }
 
        return false;
    }
 
    internal static bool IsCodeLevelConstruct(string type)
        => IsExpressionLevelConstruct(type) || IsStatementLevelConstruct(type);
 
    internal static bool IsDeclarationLevelConstruct(string type)
        => !IsCodeLevelConstruct(type) && !IsCommentOrPreprocessorRegion(type);
}