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@JamesNK @TylerBrinkley @stakx @fgreinacher
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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.Globalization;
using System.Diagnostics.CodeAnalysis;
#if !HAVE_LINQ
using Newtonsoft.Json.Utilities.LinqBridge;
#else
using System.Linq;
#endif
using Newtonsoft.Json.Serialization;
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 bool IsNullOrEmpty([NotNullWhen(false)] string? value)
{
return string.IsNullOrEmpty(value);
}
public static string FormatWith(this string format, IFormatProvider provider, object? arg0)
{
return format.FormatWith(provider, new object?[] { arg0 });
}
public static string FormatWith(this string format, IFormatProvider provider, object? arg0, object? arg1)
{
return format.FormatWith(provider, new object?[] { arg0, arg1 });
}
public static string FormatWith(this string format, IFormatProvider provider, object? arg0, object? arg1, object? arg2)
{
return format.FormatWith(provider, new object?[] { arg0, arg1, arg2 });
}
public static string FormatWith(this string format, IFormatProvider provider, object? arg0, object? arg1, object? arg2, object? arg3)
{
return format.FormatWith(provider, new object?[] { arg0, arg1, arg2, arg3 });
}
private static string FormatWith(this string format, IFormatProvider provider, params object?[] args)
{
// leave this a private to force code to use an explicit overload
// avoids stack memory being reserved for the object array
ValidationUtils.ArgumentNotNull(format, nameof(format));
return string.Format(provider, format, args);
}
/// <summary>
/// Determines whether the string is all white space. Empty string will return <c>false</c>.
/// </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(nameof(s));
}
if (s.Length == 0)
{
return false;
}
for (int i = 0; i < s.Length; i++)
{
if (!char.IsWhiteSpace(s[i]))
{
return false;
}
}
return true;
}
public static StringWriter CreateStringWriter(int capacity)
{
StringBuilder sb = new StringBuilder(capacity);
StringWriter sw = new StringWriter(sb, CultureInfo.InvariantCulture);
return sw;
}
public static void ToCharAsUnicode(char c, char[] buffer)
{
buffer[0] = '\\';
buffer[1] = 'u';
buffer[2] = MathUtils.IntToHex((c >> 12) & '\x000f');
buffer[3] = MathUtils.IntToHex((c >> 8) & '\x000f');
buffer[4] = MathUtils.IntToHex((c >> 4) & '\x000f');
buffer[5] = MathUtils.IntToHex(c & '\x000f');
}
public static TSource ForgivingCaseSensitiveFind<TSource>(this IEnumerable<TSource> source, Func<TSource, string> valueSelector, string testValue)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (valueSelector == null)
{
throw new ArgumentNullException(nameof(valueSelector));
}
IEnumerable<TSource> 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
IEnumerable<TSource> caseSensitiveResults = source.Where(s => string.Equals(valueSelector(s), testValue, StringComparison.Ordinal));
return caseSensitiveResults.SingleOrDefault();
}
}
public static string ToCamelCase(string s)
{
if (StringUtils.IsNullOrEmpty(s) || !char.IsUpper(s[0]))
{
return s;
}
char[] chars = s.ToCharArray();
for (int i = 0; i < chars.Length; i++)
{
if (i == 1 && !char.IsUpper(chars[i]))
{
break;
}
bool hasNext = (i + 1 < chars.Length);
if (i > 0 && hasNext && !char.IsUpper(chars[i + 1]))
{
// if the next character is a space, which is not considered uppercase
// (otherwise we wouldn't be here...)
// we want to ensure that the following:
// 'FOO bar' is rewritten as 'foo bar', and not as 'foO bar'
// The code was written in such a way that the first word in uppercase
// ends when if finds an uppercase letter followed by a lowercase letter.
// now a ' ' (space, (char)32) is considered not upper
// but in that case we still want our current character to become lowercase
if (char.IsSeparator(chars[i + 1]))
{
chars[i] = ToLower(chars[i]);
}
break;
}
chars[i] = ToLower(chars[i]);
}
return new string(chars);
}
private static char ToLower(char c)
{
#if HAVE_CHAR_TO_STRING_WITH_CULTURE
c = char.ToLower(c, CultureInfo.InvariantCulture);
#else
c = char.ToLowerInvariant(c);
#endif
return c;
}
public static string ToSnakeCase(string s) => ToSeparatedCase(s, '_');
public static string ToKebabCase(string s) => ToSeparatedCase(s, '-');
private enum SeparatedCaseState
{
Start,
Lower,
Upper,
NewWord
}
private static string ToSeparatedCase(string s, char separator)
{
if (StringUtils.IsNullOrEmpty(s))
{
return s;
}
StringBuilder sb = new StringBuilder();
SeparatedCaseState state = SeparatedCaseState.Start;
for (int i = 0; i < s.Length; i++)
{
if (s[i] == ' ')
{
if (state != SeparatedCaseState.Start)
{
state = SeparatedCaseState.NewWord;
}
}
else if (char.IsUpper(s[i]))
{
switch (state)
{
case SeparatedCaseState.Upper:
bool hasNext = (i + 1 < s.Length);
if (i > 0 && hasNext)
{
char nextChar = s[i + 1];
if (!char.IsUpper(nextChar) && nextChar != separator)
{
sb.Append(separator);
}
}
break;
case SeparatedCaseState.Lower:
case SeparatedCaseState.NewWord:
sb.Append(separator);
break;
}
char c;
#if HAVE_CHAR_TO_LOWER_WITH_CULTURE
c = char.ToLower(s[i], CultureInfo.InvariantCulture);
#else
c = char.ToLowerInvariant(s[i]);
#endif
sb.Append(c);
state = SeparatedCaseState.Upper;
}
else if (s[i] == separator)
{
sb.Append(separator);
state = SeparatedCaseState.Start;
}
else
{
if (state == SeparatedCaseState.NewWord)
{
sb.Append(separator);
}
sb.Append(s[i]);
state = SeparatedCaseState.Lower;
}
}
return sb.ToString();
}
public static bool IsHighSurrogate(char c)
{
#if HAVE_UNICODE_SURROGATE_DETECTION
return char.IsHighSurrogate(c);
#else
return (c >= 55296 && c <= 56319);
#endif
}
public static bool IsLowSurrogate(char c)
{
#if HAVE_UNICODE_SURROGATE_DETECTION
return char.IsLowSurrogate(c);
#else
return (c >= 56320 && c <= 57343);
#endif
}
public static bool StartsWith(this string source, char value)
{
return (source.Length > 0 && source[0] == value);
}
public static bool EndsWith(this string source, char value)
{
return (source.Length > 0 && source[source.Length - 1] == value);
}
public static string Trim(this string s, int start, int length)
{
// References: https://referencesource.microsoft.com/#mscorlib/system/string.cs,2691
// https://referencesource.microsoft.com/#mscorlib/system/string.cs,1226
if (s == null)
{
throw new ArgumentNullException();
}
if (start < 0)
{
throw new ArgumentOutOfRangeException(nameof(start));
}
if (length < 0)
{
throw new ArgumentOutOfRangeException(nameof(length));
}
int end = start + length - 1;
if (end >= s.Length)
{
throw new ArgumentOutOfRangeException(nameof(length));
}
for (; start < end; start++)
{
if (!char.IsWhiteSpace(s[start]))
{
break;
}
}
for (; end >= start; end--)
{
if (!char.IsWhiteSpace(s[end]))
{
break;
}
}
return s.Substring(start, end - start + 1);
}
}
}
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