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System.cs
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System.cs
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using System.Collections.Generic;
using System.Linq;
using System.Text;
using JetBrains.Annotations;
namespace System
{
public static class StringExtensions
{
/// <summary>'\n'</summary>
static readonly char[] NewLineSeparator = new char[] { '\n' };
public static string SkipStr(this string str, string toSkip)
{
if (str == null)
return null;
int idx;
idx = str.IndexOf(toSkip);
if (idx != -1)
return str.Substring(idx + toSkip.Length);
else
return null;
}
public static String TakeUntilStr(this string str, String untilStr)
{
if (str == null)
return null;
int idx;
idx = str.IndexOf(untilStr);
if (idx != -1)
return str.Substring(0, idx);
else
return str;
}
public static string CommonPrefix(this string s, string other)
{
if (s.IsNullOrEmpty() || other.IsNullOrEmpty())
return string.Empty;
int prefixLength = 0;
foreach (char c in other)
{
if (s.Length <= prefixLength || s[prefixLength] != c)
return s.Substring(0, prefixLength);
prefixLength++;
}
return s;
}
public static bool IsNullOrEmpty(this string s)
{
return string.IsNullOrEmpty(s);
}
public static string Combine(this string left, string sep, string right)
{
if (left.IsNullOrEmpty())
return right;
else if (right.IsNullOrEmpty())
return left;
else
return left + sep + right;
}
/// <summary>
/// Quotes string if it is not null
/// </summary>
public static string Quote(this string s)
{
return s.Quote("\"");
}
public static string Quote(this string s, string quotationMark)
{
if (s == null)
return string.Empty;
return quotationMark + s + quotationMark;
}
/// <summary>
/// Quotes string if it is not null and not empty
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public static string QuoteNE(this string s)
{
return s.IsNullOrEmpty() ? s : s.Quote("\"");
}
/// <summary>
/// Adds parentheses if string is not null and not empty
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public static string AddParenthesesNE(this string s)
{
return s.IsNullOrEmpty() ? s : "(" + s + ")";
}
/// <summary>
/// Indicates whether a specified string is null, empty, or consists only of white-space characters.
/// </summary>
/// <param name="value">The string to test.</param>
/// <remarks>
/// This method is copied from .Net Framework 4.0 and should be deleted after leaving 3.5.
/// </remarks>
/// <returns>
/// true if the value parameter is null or <see cref="string.Empty"/>, or if value consists exclusively of white-space characters.
/// </returns>
[Pure]
public static bool IsNullOrWhiteSpace([CanBeNull] this string value)
{
return string.IsNullOrWhiteSpace(value);
}
/// <summary>Indicates whether the specified string is neither null, nor empty, nor has only whitespace.</summary>
public static bool IsNotNullOrWhitespace([CanBeNull] this string value)
{
return !value.IsNullOrWhiteSpace();
}
/// <summary>
/// Determines whether the beginning of this instance matches any of the specified strings.
/// </summary>
/// <param name="value"></param>
/// <param name="starts">array of strings to compare</param>
/// <returns>true if any starts element matches the beginning of this string; otherwise, false.</returns>
public static bool StartsWithAny([CanBeNull] this string value, string[] starts)
{
return value != null && starts.Any(s => value.StartsWith(s));
}
public static string RemoveLines(this string value, Func<string, bool> shouldRemoveLine)
{
if (value.IsNullOrEmpty())
return value;
if (value[value.Length - 1] == '\n')
value = value.Substring(0, value.Length - 1);
StringBuilder sb = new StringBuilder();
string[] lines = value.Split('\n');
foreach (string line in lines)
if (!shouldRemoveLine(line))
sb.Append(line + '\n');
return sb.ToString();
}
/// <summary>Split a string, removing empty entries, then trim whitespace.</summary>
public static IEnumerable<string> SplitThenTrim(this string value, params string[] separator)
{
return value
.Split(separator, StringSplitOptions.RemoveEmptyEntries)
.Select(s => s.Trim());
}
/// <summary>Split a string, removing empty entries, then trim whitespace.</summary>
public static IEnumerable<string> SplitThenTrim(this string value, params char[] separator)
{
return value
.Split(separator, StringSplitOptions.RemoveEmptyEntries)
.Select(s => s.Trim());
}
/// <summary>Split a string, delimited by line-breaks, excluding empty entries.</summary>
public static string[] SplitLines(this string value)
{
return value.Split(NewLineSeparator);
}
/// <summary>Split a string, delimited by line-breaks, excluding empty entries; then trim whitespace.</summary>
public static IEnumerable<string> SplitLinesThenTrim(this string value)
{
return value.SplitThenTrim(NewLineSeparator);
}
/// <summary>Gets the text after the last separator.
/// If NO separator OR ends with separator, returns the original value.</summary>
public static string SubstringAfterLastSafe(this string value, string separator)
{// ex: "origin/master" -> "master"
if (value.EndsWith(separator) || !value.Contains(separator))
{// "origin/master/" OR "master" -> return original
return value;
}
return value.Substring(1 + value.LastIndexOf(separator, StringComparison.InvariantCultureIgnoreCase));
}
public static string SubstringAfterFirst(this string value, string separator)
{
return value.Substring(1 + value.IndexOf(separator, StringComparison.InvariantCultureIgnoreCase));
}
}
public static class BoolExtensions
{
public static string AsForce(this bool force)
{
return force ? " -f " : string.Empty;
}
}
}