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using System;
namespace VersOne.Epub.Internal
{
internal static class ContentPathUtils
{
private const string DIRECTORY_UP = "../";
public static bool IsLocalPath(string path) => path != null ? !path.Contains("://") : throw new ArgumentNullException(nameof(path));
public static string GetDirectoryPath(string filePath)
{
int lastSlashIndex = filePath.LastIndexOf('/');
if (lastSlashIndex == -1)
{
return String.Empty;
}
else
{
return filePath.Substring(0, lastSlashIndex);
}
}
public static string Combine(string directory, string fileName)
{
directory = RemoveRepeatingSlashes(directory);
fileName = RemoveRepeatingSlashes(fileName);
if (String.IsNullOrEmpty(directory))
{
return fileName;
}
else if (String.IsNullOrEmpty(fileName))
{
return directory;
}
else
{
while (fileName.StartsWith(DIRECTORY_UP))
{
int lastDirectorySlashIndex = directory.LastIndexOf('/');
directory = lastDirectorySlashIndex != -1 ? directory.Substring(0, lastDirectorySlashIndex) : String.Empty;
fileName = fileName.Substring(DIRECTORY_UP.Length);
}
return String.IsNullOrEmpty(directory) ? fileName : String.Concat(directory, '/', fileName);
}
}
private static string RemoveRepeatingSlashes(string path)
{
if (String.IsNullOrEmpty(path))
{
return path;
}
while (path.Contains("//"))
{
path = path.Replace("//", "/");
}
return path;
}
}
}
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