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using System;
using System.Diagnostics.CodeAnalysis;
namespace VersOne.Epub.Schema
{
/// <summary>
/// <para>Text direction of the content.</para>
/// <para>See <see href="https://www.w3.org/TR/epub-33/#attrdef-dir" /> for more information.</para>
/// </summary>
public enum EpubTextDirection
{
/// <summary>
/// Left-to-right text direction.
/// </summary>
LEFT_TO_RIGHT,
/// <summary>
/// Right-to-left text direction.
/// </summary>
RIGHT_TO_LEFT,
/// <summary>
/// Direction is determined using the Unicode Bidirectional Algorithm.
/// </summary>
AUTO,
/// <summary>
/// A text 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 EpubTextDirectionParser
{
public static EpubTextDirection Parse(string stringValue)
{
if (String.IsNullOrEmpty(stringValue))
{
return EpubTextDirection.UNKNOWN;
}
return stringValue.ToLowerInvariant() switch
{
"ltr" => EpubTextDirection.LEFT_TO_RIGHT,
"rtl" => EpubTextDirection.RIGHT_TO_LEFT,
"auto" => EpubTextDirection.AUTO,
_ => EpubTextDirection.UNKNOWN
};
}
}
}
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