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using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Text.RegularExpressions;
namespace Emby.Naming.Video
{
/// <summary>
/// <see href="http://kodi.wiki/view/Advancedsettings.xml#video" />.
/// </summary>
public static class CleanStringParser
{
/// <summary>
/// Attempts to extract clean name with regular expressions.
/// </summary>
/// <param name="name">Name of file.</param>
/// <param name="expressions">List of regex to parse name and year from.</param>
/// <param name="newName">Parsing result string.</param>
/// <returns>True if parsing was successful.</returns>
public static bool TryClean([NotNullWhen(true)] string? name, IReadOnlyList<Regex> expressions, out ReadOnlySpan<char> newName)
{
if (string.IsNullOrEmpty(name))
{
newName = ReadOnlySpan<char>.Empty;
return false;
}
// Iteratively remove extra cruft until we're left with the string
// we want.
newName = ReadOnlySpan<char>.Empty;
const int maxTries = 100; // This is just a precautionary
// measure. Should not be neccesary.
var loopCounter = 0;
for (; loopCounter < maxTries; loopCounter++)
{
bool cleaned = false;
var len = expressions.Count;
for (int i = 0; i < len; i++)
{
if (TryClean(name, expressions[i], out newName))
{
cleaned = true;
name = newName.ToString();
break;
}
}
if (!cleaned)
{
break;
}
}
if (loopCounter > 0)
{
newName = name.AsSpan();
}
return newName != ReadOnlySpan<char>.Empty;
}
private static bool TryClean(string name, Regex expression, out ReadOnlySpan<char> newName)
{
var match = expression.Match(name);
int index = match.Index;
if (match.Success)
{
var found = match.Groups.TryGetValue("cleaned", out var cleaned);
if (!found || cleaned == null)
{
newName = ReadOnlySpan<char>.Empty;
return false;
}
newName = name.AsSpan().Slice(cleaned.Index, cleaned.Length);
return true;
}
newName = ReadOnlySpan<char>.Empty;
return false;
}
}
}
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