607 lines
23 KiB
C#
607 lines
23 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Diagnostics.CodeAnalysis;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Web;
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namespace Umbraco.Core
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{
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///<summary>
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/// String extension methods
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///</summary>
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public static class StringExtensions
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{
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/// <summary>
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/// Trims the specified value from a string; accepts a string input whereas the in-built implementation only accepts char or char[].
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/// </summary>
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/// <param name="value">The value.</param>
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/// <param name="forRemoving">For removing.</param>
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/// <returns></returns>
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public static string Trim(this string value, string forRemoving)
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{
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if (string.IsNullOrEmpty(value)) return value;
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return value.TrimEnd(forRemoving).TrimStart(forRemoving);
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}
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public static string TrimEnd(this string value, string forRemoving)
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{
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if (string.IsNullOrEmpty(value)) return value;
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while (value.EndsWith(forRemoving, StringComparison.InvariantCultureIgnoreCase))
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{
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value = value.Remove(value.LastIndexOf(forRemoving, StringComparison.InvariantCultureIgnoreCase));
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}
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return value;
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}
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public static string TrimStart(this string value, string forRemoving)
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{
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if (string.IsNullOrEmpty(value)) return value;
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while (value.StartsWith(forRemoving, StringComparison.InvariantCultureIgnoreCase))
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{
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value = value.Substring(forRemoving.Length);
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}
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return value;
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}
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public static string EnsureStartsWith(this string input, string toStartWith)
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{
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if (input.StartsWith(toStartWith)) return input;
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return toStartWith + input.TrimStart(toStartWith.ToArray()); // Ensure each char is removed first from input, e.g. ~/ plus /Path will equal ~/Path not ~//Path
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}
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public static bool IsLowerCase(this char ch)
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{
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return ch.ToString(CultureInfo.InvariantCulture) == ch.ToString(CultureInfo.InvariantCulture).ToLower();
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}
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/// <summary>Is null or white space.</summary>
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/// <param name="str">The str.</param>
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/// <returns>The is null or white space.</returns>
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public static bool IsNullOrWhiteSpace(this string str)
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{
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return (str == null) || (str.Trim().Length == 0);
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}
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public static string IfNullOrWhiteSpace(this string str, string defaultValue)
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{
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return str.IsNullOrWhiteSpace() ? defaultValue : str;
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}
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/// <summary>The to delimited list.</summary>
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/// <param name="list">The list.</param>
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/// <param name="delimiter">The delimiter.</param>
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/// <returns>the list</returns>
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[SuppressMessage("Microsoft.Design", "CA1026:DefaultParametersShouldNotBeUsed", Justification = "By design")]
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public static IList<string> ToDelimitedList(this string list, string delimiter = ",")
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{
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var delimiters = new[] { delimiter };
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return !list.IsNullOrWhiteSpace()
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? list.Split(delimiters, StringSplitOptions.RemoveEmptyEntries)
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.Select(i => i.Trim())
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.ToList()
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: new List<string>();
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}
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/// <summary>enum try parse.</summary>
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/// <param name="strType">The str type.</param>
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/// <param name="ignoreCase">The ignore case.</param>
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/// <param name="result">The result.</param>
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/// <typeparam name="T">The type</typeparam>
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/// <returns>The enum try parse.</returns>
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[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "By Design")]
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[SuppressMessage("Microsoft.Design", "CA1021:AvoidOutParameters", MessageId = "2#", Justification = "By Design")]
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public static bool EnumTryParse<T>(this string strType, bool ignoreCase, out T result)
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{
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try
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{
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result = (T)Enum.Parse(typeof(T), strType, ignoreCase);
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return true;
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}
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catch
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{
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result = default(T);
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return false;
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}
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}
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/// <summary>
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/// Strips all html from a string.
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/// </summary>
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/// <param name="text">The text.</param>
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/// <returns>Returns the string without any html tags.</returns>
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public static string StripHtml(this string text)
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{
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const string pattern = @"<(.|\n)*?>";
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return Regex.Replace(text, pattern, String.Empty);
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}
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/// <summary>
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/// Converts string to a URL alias.
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/// </summary>
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/// <param name="value">The value.</param>
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/// <param name="charReplacements">The char replacements.</param>
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/// <param name="replaceDoubleDashes">if set to <c>true</c> replace double dashes.</param>
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/// <param name="stripNonAscii">if set to <c>true</c> strip non ASCII.</param>
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/// <param name="urlEncode">if set to <c>true</c> URL encode.</param>
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/// <returns></returns>
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/// <remarks>
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/// This ensures that ONLY ascii chars are allowed and of those ascii chars, only digits and lowercase chars, all
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/// punctuation, etc... are stripped out, however this method allows you to pass in string's to replace with the
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/// specified replacement character before the string is converted to ascii and it has invalid characters stripped out.
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/// This allows you to replace strings like & , etc.. with your replacement character before the automatic
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/// reduction.
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/// </remarks>
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public static string ToUrlAlias(this string value, IDictionary<string, string> charReplacements, bool replaceDoubleDashes, bool stripNonAscii, bool urlEncode)
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{
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//first to lower case
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value = value.ToLowerInvariant();
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//then replacement chars
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value = charReplacements.Aggregate(value, (current, kvp) => current.Replace(kvp.Key, kvp.Value));
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//then convert to only ascii, this will remove the rest of any invalid chars
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if (stripNonAscii)
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{
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value = Encoding.ASCII.GetString(
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Encoding.Convert(
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Encoding.UTF8,
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Encoding.GetEncoding(
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Encoding.ASCII.EncodingName,
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new EncoderReplacementFallback(String.Empty),
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new DecoderExceptionFallback()),
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Encoding.UTF8.GetBytes(value)));
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//remove all characters that do not fall into the following categories (apart from the replacement val)
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var validCodeRanges =
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//digits
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Enumerable.Range(48, 10).Concat(
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//lowercase chars
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Enumerable.Range(97, 26));
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var sb = new StringBuilder();
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foreach (var c in value.Where(c => charReplacements.Values.Contains(c.ToString()) || validCodeRanges.Contains(c)))
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{
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sb.Append(c);
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}
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value = sb.ToString();
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}
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//trim dashes from end
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value = value.Trim('-', '_');
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//replace double occurances of - or _
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value = replaceDoubleDashes ? Regex.Replace(value, @"([-_]){2,}", "$1", RegexOptions.Compiled) : value;
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//url encode result
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return urlEncode ? HttpUtility.UrlEncode(value) : value;
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}
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/// <summary>
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/// Converts a string for use with an entity alias which is camel case and without invalid characters
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/// </summary>
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/// <param name="phrase">The phrase.</param>
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/// <param name="caseType">By default this is camel case</param>
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/// <param name="removeSpaces">if set to <c>true</c> [remove spaces].</param>
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/// <returns></returns>
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public static string ToUmbracoAlias(this string phrase, StringAliasCaseType caseType = StringAliasCaseType.CamelCase, bool removeSpaces = false)
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{
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if (string.IsNullOrEmpty(phrase)) return string.Empty;
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//convert case first
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var tmp = phrase.ConvertCase(caseType);
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//remove non-alphanumeric chars
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var result = Regex.Replace(tmp, @"[^a-zA-Z0-9\s\.-]+", "", RegexOptions.Compiled);
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if (removeSpaces)
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result = result.Replace(" ", "");
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return result;
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}
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/// <summary>
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/// Converts the phrase to specified convention.
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/// </summary>
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/// <param name="phrase"></param>
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/// <param name="cases">The cases.</param>
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/// <returns>string</returns>
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public static string ConvertCase(this string phrase, StringAliasCaseType cases)
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{
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var splittedPhrase = Regex.Split(phrase, @"[^a-zA-Z0-9\']", RegexOptions.Compiled);
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if (cases == StringAliasCaseType.Unchanged)
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return string.Join("", splittedPhrase);
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//var splittedPhrase = phrase.Split(' ', '-', '.');
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var sb = new StringBuilder();
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foreach (var splittedPhraseChars in splittedPhrase.Select(s => s.ToCharArray()))
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{
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if (splittedPhraseChars.Length > 0)
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{
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splittedPhraseChars[0] = ((new String(splittedPhraseChars[0], 1)).ToUpper().ToCharArray())[0];
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}
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sb.Append(new String(splittedPhraseChars));
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}
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var result = sb.ToString();
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if (cases == StringAliasCaseType.CamelCase)
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{
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if (result.Length > 1)
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{
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var pattern = new Regex("^([A-Z]*)([A-Z].*)$", RegexOptions.Singleline | RegexOptions.Compiled);
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var match = pattern.Match(result);
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if (match.Success)
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{
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result = match.Groups[1].Value.ToLower() + match.Groups[2].Value;
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return result.Substring(0, 1).ToLower() + result.Substring(1);
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}
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return result;
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}
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return result.ToLower();
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}
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return result;
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}
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/// <summary>
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/// Encodes as GUID.
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/// </summary>
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/// <param name="input">The input.</param>
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/// <returns></returns>
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public static Guid EncodeAsGuid(this string input)
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{
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if (string.IsNullOrWhiteSpace(input)) throw new ArgumentNullException("input");
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var convertToHex = input.ConvertToHex();
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var hexLength = convertToHex.Length < 32 ? convertToHex.Length : 32;
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var hex = convertToHex.Substring(0, hexLength).PadLeft(32, '0');
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var output = Guid.Empty;
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return Guid.TryParse(hex, out output) ? output : Guid.Empty;
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}
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/// <summary>
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/// Converts to hex.
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/// </summary>
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/// <param name="input">The input.</param>
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/// <returns></returns>
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public static string ConvertToHex(this string input)
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{
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if (String.IsNullOrEmpty(input)) return String.Empty;
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var sb = new StringBuilder(input.Length);
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foreach (char c in input)
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{
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int tmp = c;
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sb.AppendFormat("{0:x2}", Convert.ToUInt32(c));
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}
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return sb.ToString();
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}
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///<summary>
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/// Encodes a string to a safe URL base64 string
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///</summary>
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///<param name="input"></param>
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///<returns></returns>
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public static string ToUrlBase64(this string input)
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{
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if (input == null) throw new ArgumentNullException("input");
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if (String.IsNullOrEmpty(input)) return String.Empty;
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var bytes = Encoding.UTF8.GetBytes(input);
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return UrlTokenEncode(bytes);
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//return Convert.ToBase64String(bytes).Replace(".", "-").Replace("/", "_").Replace("=", ",");
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}
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/// <summary>
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/// Decodes a URL safe base64 string back
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/// </summary>
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/// <param name="input"></param>
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/// <returns></returns>
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public static string FromUrlBase64(this string input)
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{
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if (input == null) throw new ArgumentNullException("input");
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//if (input.IsInvalidBase64()) return null;
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try
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{
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//var decodedBytes = Convert.FromBase64String(input.Replace("-", ".").Replace("_", "/").Replace(",", "="));
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byte[] decodedBytes = UrlTokenDecode(input);
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return decodedBytes != null ? Encoding.UTF8.GetString(decodedBytes) : null;
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}
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catch (FormatException ex)
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{
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return null;
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}
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}
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/// <summary>
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/// formats the string with invariant culture
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/// </summary>
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/// <param name="format">The format.</param>
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/// <param name="args">The args.</param>
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/// <returns></returns>
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public static string InvariantFormat(this string format, params object[] args)
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{
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return String.Format(CultureInfo.InvariantCulture, format, args);
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}
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/// <summary>
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/// Compares 2 strings with invariant culture and case ignored
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/// </summary>
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/// <param name="compare">The compare.</param>
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/// <param name="compareTo">The compare to.</param>
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/// <returns></returns>
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public static bool InvariantEquals(this string compare, string compareTo)
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{
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return String.Equals(compare, compareTo, StringComparison.InvariantCultureIgnoreCase);
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}
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public static bool InvariantContains(this IEnumerable<string> compare, string compareTo)
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{
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|
|
return compare.Contains(compareTo, new DelegateEqualityComparer<string>((source, dest) => source.Equals(dest, StringComparison.InvariantCultureIgnoreCase), x => x.GetHashCode()));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Determines if the string is a Guid
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="str"></param>
|
|||
|
|
/// <param name="withHyphens"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static bool IsGuid(this string str, bool withHyphens)
|
|||
|
|
{
|
|||
|
|
var isGuid = false;
|
|||
|
|
|
|||
|
|
if (!String.IsNullOrEmpty(str))
|
|||
|
|
{
|
|||
|
|
Regex guidRegEx;
|
|||
|
|
if (withHyphens)
|
|||
|
|
{
|
|||
|
|
guidRegEx = new Regex(@"^(\{{0,1}([0-9a-fA-F]){8}-([0-9a-fA-F]){4}-([0-9a-fA-F]){4}-([0-9a-fA-F]){4}-([0-9a-fA-F]){12}\}{0,1})$");
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
guidRegEx = new Regex(@"^(\{{0,1}([0-9a-fA-F]){8}([0-9a-fA-F]){4}([0-9a-fA-F]){4}([0-9a-fA-F]){4}([0-9a-fA-F]){12}\}{0,1})$");
|
|||
|
|
}
|
|||
|
|
isGuid = guidRegEx.IsMatch(str);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return isGuid;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Tries to parse a string into the supplied type by finding and using the Type's "Parse" method
|
|||
|
|
/// </summary>
|
|||
|
|
/// <typeparam name="T"></typeparam>
|
|||
|
|
/// <param name="val"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static T ParseInto<T>(this string val)
|
|||
|
|
{
|
|||
|
|
return (T)val.ParseInto(typeof(T));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Tries to parse a string into the supplied type by finding and using the Type's "Parse" method
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="val"></param>
|
|||
|
|
/// <param name="type"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static object ParseInto(this string val, Type type)
|
|||
|
|
{
|
|||
|
|
if (!String.IsNullOrEmpty(val))
|
|||
|
|
{
|
|||
|
|
TypeConverter tc = TypeDescriptor.GetConverter(type);
|
|||
|
|
return tc.ConvertFrom(val);
|
|||
|
|
}
|
|||
|
|
return val;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Converts the string to MD5
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="stringToConvert">referrs to itself</param>
|
|||
|
|
/// <returns>the md5 hashed string</returns>
|
|||
|
|
public static string ToMd5(this string stringToConvert)
|
|||
|
|
{
|
|||
|
|
//create an instance of the MD5CryptoServiceProvider
|
|||
|
|
var md5Provider = new MD5CryptoServiceProvider();
|
|||
|
|
|
|||
|
|
//convert our string into byte array
|
|||
|
|
var byteArray = Encoding.UTF8.GetBytes(stringToConvert);
|
|||
|
|
|
|||
|
|
//get the hashed values created by our MD5CryptoServiceProvider
|
|||
|
|
var hashedByteArray = md5Provider.ComputeHash(byteArray);
|
|||
|
|
|
|||
|
|
//create a StringBuilder object
|
|||
|
|
var stringBuilder = new StringBuilder();
|
|||
|
|
|
|||
|
|
//loop to each each byte
|
|||
|
|
foreach (var b in hashedByteArray)
|
|||
|
|
{
|
|||
|
|
//append it to our StringBuilder
|
|||
|
|
stringBuilder.Append(b.ToString("x2").ToLower());
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
//return the hashed value
|
|||
|
|
return stringBuilder.ToString();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Decodes a string that was encoded with UrlTokenEncode
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
internal static byte[] UrlTokenDecode(string input)
|
|||
|
|
{
|
|||
|
|
if (input == null)
|
|||
|
|
{
|
|||
|
|
throw new ArgumentNullException("input");
|
|||
|
|
}
|
|||
|
|
int length = input.Length;
|
|||
|
|
if (length < 1)
|
|||
|
|
{
|
|||
|
|
return new byte[0];
|
|||
|
|
}
|
|||
|
|
int num2 = input[length - 1] - '0';
|
|||
|
|
if ((num2 < 0) || (num2 > 10))
|
|||
|
|
{
|
|||
|
|
return null;
|
|||
|
|
}
|
|||
|
|
char[] inArray = new char[(length - 1) + num2];
|
|||
|
|
for (int i = 0; i < (length - 1); i++)
|
|||
|
|
{
|
|||
|
|
char ch = input[i];
|
|||
|
|
switch (ch)
|
|||
|
|
{
|
|||
|
|
case '-':
|
|||
|
|
inArray[i] = '+';
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
case '_':
|
|||
|
|
inArray[i] = '/';
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
default:
|
|||
|
|
inArray[i] = ch;
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
for (int j = length - 1; j < inArray.Length; j++)
|
|||
|
|
{
|
|||
|
|
inArray[j] = '=';
|
|||
|
|
}
|
|||
|
|
return Convert.FromBase64CharArray(inArray, 0, inArray.Length);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Encodes a string so that it is 'safe' for URLs, files, etc..
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
internal static string UrlTokenEncode(byte[] input)
|
|||
|
|
{
|
|||
|
|
if (input == null)
|
|||
|
|
{
|
|||
|
|
throw new ArgumentNullException("input");
|
|||
|
|
}
|
|||
|
|
if (input.Length < 1)
|
|||
|
|
{
|
|||
|
|
return String.Empty;
|
|||
|
|
}
|
|||
|
|
string str = null;
|
|||
|
|
int index = 0;
|
|||
|
|
char[] chArray = null;
|
|||
|
|
str = Convert.ToBase64String(input);
|
|||
|
|
if (str == null)
|
|||
|
|
{
|
|||
|
|
return null;
|
|||
|
|
}
|
|||
|
|
index = str.Length;
|
|||
|
|
while (index > 0)
|
|||
|
|
{
|
|||
|
|
if (str[index - 1] != '=')
|
|||
|
|
{
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
index--;
|
|||
|
|
}
|
|||
|
|
chArray = new char[index + 1];
|
|||
|
|
chArray[index] = (char)((0x30 + str.Length) - index);
|
|||
|
|
for (int i = 0; i < index; i++)
|
|||
|
|
{
|
|||
|
|
char ch = str[i];
|
|||
|
|
switch (ch)
|
|||
|
|
{
|
|||
|
|
case '+':
|
|||
|
|
chArray[i] = '-';
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
case '/':
|
|||
|
|
chArray[i] = '_';
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
case '=':
|
|||
|
|
chArray[i] = ch;
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
default:
|
|||
|
|
chArray[i] = ch;
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
return new string(chArray);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Ensures that the folder path endds with a DirectorySeperatorChar
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="currentFolder"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static string NormaliseDirectoryPath(this string currentFolder)
|
|||
|
|
{
|
|||
|
|
currentFolder = currentFolder
|
|||
|
|
.IfNull(x => String.Empty)
|
|||
|
|
.TrimEnd(Path.DirectorySeparatorChar) + Path.DirectorySeparatorChar;
|
|||
|
|
return currentFolder;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Truncates the specified text string.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="text">The text.</param>
|
|||
|
|
/// <param name="maxLength">Length of the max.</param>
|
|||
|
|
/// <param name="suffix">The suffix.</param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static string Truncate(this string text, int maxLength, string suffix = "...")
|
|||
|
|
{
|
|||
|
|
// replaces the truncated string to a ...
|
|||
|
|
var truncatedString = text;
|
|||
|
|
|
|||
|
|
if (maxLength <= 0) return truncatedString;
|
|||
|
|
var strLength = maxLength - suffix.Length;
|
|||
|
|
|
|||
|
|
if (strLength <= 0) return truncatedString;
|
|||
|
|
|
|||
|
|
if (text == null || text.Length <= maxLength) return truncatedString;
|
|||
|
|
|
|||
|
|
truncatedString = text.Substring(0, strLength);
|
|||
|
|
truncatedString = truncatedString.TrimEnd();
|
|||
|
|
truncatedString += suffix;
|
|||
|
|
|
|||
|
|
return truncatedString;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Strips carrage returns and line feeds from the specified text.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input">The input.</param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static string StripNewLines(this string input)
|
|||
|
|
{
|
|||
|
|
return input.Replace("\r", "").Replace("\n", "");
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static string OrIfNullOrWhiteSpace(this string input, string alternative)
|
|||
|
|
{
|
|||
|
|
return !string.IsNullOrWhiteSpace(input)
|
|||
|
|
? input
|
|||
|
|
: alternative;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|