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#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;
using System.Globalization;
namespace Newtonsoft.Json.Utilities
{
internal static class StringUtils
{
public const string CarriageReturnLineFeed = "\r\n";
public const string Empty = "";
public const char CarriageReturn = '\r';
public const char LineFeed = '\n';
public const char Tab = '\t';
public static string FormatWith(this string format, IFormatProvider provider, params object[] args)
{
ValidationUtils.ArgumentNotNull(format, "format");
return string.Format(provider, format, args);
}
/// <summary>
/// Determines whether the string is all white space. Empty string will return false.
/// </summary>
/// <param name="s">The string to test whether it is all white space.</param>
/// <returns>
/// <c>true</c> if the string is all white space; otherwise, <c>false</c>.
/// </returns>
public static bool IsWhiteSpace(string s)
{
if (s == null)
throw new ArgumentNullException("s");
if (s.Length == 0)
return false;
for (int i = 0; i < s.Length; i++)
{
if (!char.IsWhiteSpace(s[i]))
return false;
}
return true;
}
/// <summary>
/// Nulls an empty string.
/// </summary>
/// <param name="s">The string.</param>
/// <returns>Null if the string was null, otherwise the string unchanged.</returns>
public static string NullEmptyString(string s)
{
return (string.IsNullOrEmpty(s)) ? null : s;
}
public static StringWriter CreateStringWriter(int capacity)
{
StringBuilder sb = new StringBuilder(capacity);
StringWriter sw = new StringWriter(sb, CultureInfo.InvariantCulture);
return sw;
}
public static int? GetLength(string value)
{
if (value == null)
return null;
else
return value.Length;
}
public static string ToCharAsUnicode(char c)
{
char h1 = MathUtils.IntToHex((c >> 12) & '\x000f');
char h2 = MathUtils.IntToHex((c >> 8) & '\x000f');
char h3 = MathUtils.IntToHex((c >> 4) & '\x000f');
char h4 = MathUtils.IntToHex(c & '\x000f');
return new string(new[] { '\\', 'u', h1, h2, h3, h4 });
}
public static TSource ForgivingCaseSensitiveFind<TSource>(this IEnumerable<TSource> source, Func<TSource, string> valueSelector, string testValue)
{
if (source == null)
throw new ArgumentNullException("source");
if (valueSelector == null)
throw new ArgumentNullException("valueSelector");
var caseInsensitiveResults = source.Where(s => string.Equals(valueSelector(s), testValue, StringComparison.OrdinalIgnoreCase));
if (caseInsensitiveResults.Count() <= 1)
{
return caseInsensitiveResults.SingleOrDefault();
}
else
{
// multiple results returned. now filter using case sensitivity
var caseSensitiveResults = source.Where(s => string.Equals(valueSelector(s), testValue, StringComparison.Ordinal));
return caseSensitiveResults.SingleOrDefault();
}
}
public static string ToCamelCase(string s)
{
if (string.IsNullOrEmpty(s))
return s;
if (!char.IsUpper(s[0]))
return s;
string camelCase = null;
#if !NETFX_CORE
camelCase = char.ToLower(s[0], CultureInfo.InvariantCulture).ToString(CultureInfo.InvariantCulture);
#else
camelCase = char.ToLower(s[0]).ToString();
#endif
if (s.Length > 1)
camelCase += s.Substring(1);
return camelCase;
}
}
}
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