Src/Newtonsoft.Json/Utilities/JavaScriptUtils.cs

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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;
using System.Globalization;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Collections.Generic;

namespace Newtonsoft.Json.Utilities
{
  internal static class JavaScriptUtils
  {
    public static void WriteEscapedJavaScriptString(TextWriter writer, string s, char delimiter, bool appendDelimiters)
    {
      // leading delimiter
      if (appendDelimiters)
        writer.Write(delimiter);

      if (s != null)
      {
        char[] chars = null;
        int lastWritePosition = 0;

        for (int i = 0; i < s.Length; i++)
        {
          var c = s[i];

          // don't escape standard text/numbers except '\' and the text delimiter
          if (c >= ' ' && c < 128 && c != '\\' && c != delimiter)
            continue;

          string escapedValue;

          switch (c)
          {