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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
/// <exclude/>
/// <summary>
/// A collection of <see cref="String"/> extension methods.
/// </summary>
internal static class StringExtensions
{
private static Regex titleRegEx;
/// <summary>
/// Initializes the <see cref="StringExtensions"/> class.
/// </summary>
static StringExtensions()
{
titleRegEx = new Regex(@"
(?<=[A-Z])(?=[A-Z][a-z]) |
(?<=[^A-Z])(?=[A-Z]) |
(?<=[A-Za-z])(?=[^A-Za-z])", RegexOptions.IgnorePatternWhitespace);
}
/// <summary>
/// Returns true if the string is not null or contains white spaces.
/// </summary>
/// <param name="str">The string.</param>
/// <returns></returns>
internal static bool IsValid(this String str)
{
return !String.IsNullOrWhiteSpace(str);
}
/// <summary>
/// Determines whether the string contains an existing file path.
/// </summary>
/// <param name="path">The path.</param>
/// <returns></returns>
internal static bool IsFileExists(this String path)
{
return System.IO.File.Exists(path);
}
/// <summary>
/// Determines whether the string is valid as a file system path.
/// </summary>
/// <param name="path">The path.</param>
/// <returns></returns>
internal static bool IsPathValid(this String path)
{
return path.IsValid() && path.IndexOfAny(System.IO.Path.GetInvalidPathChars()) == -1;
}
/// <summary>
/// Returns a friendly file size of the file path.
/// </summary>
/// <param name="filePath">The file path.</param>
/// <returns></returns>
internal static String GetFileSizeString(this String filePath)
{
FileInfo f = new FileInfo(filePath);
double length = f.Length;
string[] sizes = { "B", "KB", "MB", "GB" };
double len = length;
int order = 0;
while (len >= 1024 && order + 1 < sizes.Length)
{
order++;
len = len / 1024;
}
// Adjust the format string to your preferences. For example "{0:0.#}{1}" would
// show a single decimal place, and no space.
return String.Format("{0:0.##} {1}", len, sizes[order]);
}
/// <summary>
/// If string is a path, returns the file name.
/// </summary>
/// <param name="filePath">The file path.</param>
/// <returns></returns>
internal static String GetFileName(this String filePath)
{
return Path.GetFileName(filePath);
}
/// <summary>
/// If string is a path, returns the file extension.
/// </summary>
/// <param name="filePath">The file path.</param>
/// <returns></returns>
internal static String GetFileExtension(this String filePath)
{
return Path.GetExtension(filePath);
}
internal static String ToTitle(this String str)
{
return titleRegEx.Replace(str, " ");
}
}
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