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using System.Text.RegularExpressions;
namespace Emby.Naming.Book
{
/// <summary>
/// Helper class to retrieve basic metadata from a book filename.
/// </summary>
public static class BookFileNameParser
{
private const string NameMatchGroup = "name";
private const string IndexMatchGroup = "index";
private const string YearMatchGroup = "year";
private const string SeriesNameMatchGroup = "seriesName";
private static readonly Regex[] _nameMatches =
[
// seriesName (seriesYear) #index (of count) (year) where only seriesName and index are required
new Regex(@"^(?<seriesName>.+?)((\s\((?<seriesYear>[0-9]{4})\))?)\s#(?<index>[0-9]+)((\s\(of\s(?<count>[0-9]+)\))?)((\s\((?<year>[0-9]{4})\))?)$"),
new Regex(@"^(?<name>.+?)\s\((?<seriesName>.+?),\s#(?<index>[0-9]+)\)((\s\((?<year>[0-9]{4})\))?)$"),
new Regex(@"^(?<index>[0-9]+)\s\-\s(?<name>.+?)((\s\((?<year>[0-9]{4})\))?)$"),
new Regex(@"(?<name>.*)\((?<year>[0-9]{4})\)"),
// last resort matches the whole string as the name
new Regex(@"(?<name>.*)")
];
/// <summary>
/// Parse a filename name to retrieve the book name, series name, index, and year.
/// </summary>
/// <param name="name">Book filename to parse for information.</param>
/// <returns>Returns <see cref="BookFileNameParserResult"/> object.</returns>
public static BookFileNameParserResult Parse(string? name)
{
var result = new BookFileNameParserResult();
if (name == null)
{
return result;
}
foreach (var regex in _nameMatches)
{
var match = regex.Match(name);
if (!match.Success)
{
continue;
}
if (match.Groups.TryGetValue(NameMatchGroup, out Group? nameGroup) && nameGroup.Success)
{
result.Name = nameGroup.Value.Trim();
}
if (match.Groups.TryGetValue(IndexMatchGroup, out Group? indexGroup) && indexGroup.Success && int.TryParse(indexGroup.Value, out var index))
{
result.Index = index;
}
if (match.Groups.TryGetValue(YearMatchGroup, out Group? yearGroup) && yearGroup.Success && int.TryParse(yearGroup.Value, out var year))
{
result.Year = year;
}
if (match.Groups.TryGetValue(SeriesNameMatchGroup, out Group? seriesGroup) && seriesGroup.Success)
{
result.SeriesName = seriesGroup.Value.Trim();
}
break;
}
return result;
}
}
}
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