﻿// 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);
    }
}
