EpubReader/Source/VersOne.Epub/Schema/Opf/Spine/EpubPageProgressionDirection.cs

using System;
using System.Diagnostics.CodeAnalysis;

namespace VersOne.Epub.Schema
{
    /// <summary>
    /// <para>Page progression direction within the spine. Represents the global direction in which the content flows.</para>
    /// <para>See <see href="https://www.w3.org/TR/epub-33/#attrdef-spine-page-progression-direction" /> for more information.</para>
    /// </summary>
    public enum EpubPageProgressionDirection
    {
        /// <summary>
        /// Default page progression direction. The actual direction should be chosen based on the book's language.
        /// </summary>
        DEFAULT = 1,

        /// <summary>
        /// Left-to-right page progression direction.
        /// </summary>
        LEFT_TO_RIGHT,

        /// <summary>
        /// Right-to-left page progression direction.
        /// </summary>
        RIGHT_TO_LEFT,

        /// <summary>
        /// A page progression direction which is not present in this enumeration.
        /// </summary>
        UNKNOWN
    }

    [SuppressMessage("StyleCop.CSharp.DocumentationRules", "SA1649:File name should match first type name",
        Justification = "Enum and parser need to be close to each other to avoid issues when the enum was changed without changing the parser. The file needs to be named after enum.")]
    internal static class EpubPageProgressionDirectionParser
    {
        public static EpubPageProgressionDirection Parse(string stringValue)
        {
            if (String.IsNullOrEmpty(stringValue))
            {
                return EpubPageProgressionDirection.UNKNOWN;
            }
            return stringValue.ToLowerInvariant() switch
            {
                "default" => EpubPageProgressionDirection.DEFAULT,
                "ltr" => EpubPageProgressionDirection.LEFT_TO_RIGHT,
                "rtl" => EpubPageProgressionDirection.RIGHT_TO_LEFT,
                _ => EpubPageProgressionDirection.UNKNOWN
            };
        }
    }
}