656 lines
25 KiB
C#
656 lines
25 KiB
C#
#region License
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// Copyright (c) 2007 James Newton-King
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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using System.IO;
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#if HAVE_ASYNC
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using System.Threading;
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using System.Threading.Tasks;
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#endif
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Runtime.CompilerServices;
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using System.Diagnostics.CodeAnalysis;
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#if !HAVE_LINQ
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using LC.Newtonsoft.Json.Utilities.LinqBridge;
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#else
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using System.Linq;
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#endif
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namespace LC.Newtonsoft.Json.Utilities
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{
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internal static class BufferUtils
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{
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public static char[] RentBuffer(IArrayPool<char>? bufferPool, int minSize)
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{
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if (bufferPool == null)
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{
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return new char[minSize];
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}
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char[] buffer = bufferPool.Rent(minSize);
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return buffer;
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}
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public static void ReturnBuffer(IArrayPool<char>? bufferPool, char[]? buffer)
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{
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bufferPool?.Return(buffer);
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}
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public static char[] EnsureBufferSize(IArrayPool<char>? bufferPool, int size, char[]? buffer)
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{
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if (bufferPool == null)
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{
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return new char[size];
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}
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if (buffer != null)
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{
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bufferPool.Return(buffer);
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}
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return bufferPool.Rent(size);
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}
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}
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internal static class JavaScriptUtils
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{
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internal static readonly bool[] SingleQuoteCharEscapeFlags = new bool[128];
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internal static readonly bool[] DoubleQuoteCharEscapeFlags = new bool[128];
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internal static readonly bool[] HtmlCharEscapeFlags = new bool[128];
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private const int UnicodeTextLength = 6;
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static JavaScriptUtils()
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{
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IList<char> escapeChars = new List<char>
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{
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'\n', '\r', '\t', '\\', '\f', '\b',
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};
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for (int i = 0; i < ' '; i++)
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{
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escapeChars.Add((char)i);
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}
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foreach (char escapeChar in escapeChars.Union(new[] { '\'' }))
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{
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SingleQuoteCharEscapeFlags[escapeChar] = true;
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}
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foreach (char escapeChar in escapeChars.Union(new[] { '"' }))
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{
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DoubleQuoteCharEscapeFlags[escapeChar] = true;
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}
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foreach (char escapeChar in escapeChars.Union(new[] { '"', '\'', '<', '>', '&' }))
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{
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HtmlCharEscapeFlags[escapeChar] = true;
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}
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}
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private const string EscapedUnicodeText = "!";
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public static bool[] GetCharEscapeFlags(StringEscapeHandling stringEscapeHandling, char quoteChar)
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{
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if (stringEscapeHandling == StringEscapeHandling.EscapeHtml)
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{
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return HtmlCharEscapeFlags;
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}
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if (quoteChar == '"')
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{
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return DoubleQuoteCharEscapeFlags;
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}
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return SingleQuoteCharEscapeFlags;
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}
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public static bool ShouldEscapeJavaScriptString(string? s, bool[] charEscapeFlags)
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{
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if (s == null)
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{
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return false;
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}
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for (int i = 0; i < s.Length; i++)
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{
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char c = s[i];
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if (c >= charEscapeFlags.Length || charEscapeFlags[c])
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{
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return true;
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}
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}
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return false;
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}
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public static void WriteEscapedJavaScriptString(TextWriter writer, string? s, char delimiter, bool appendDelimiters,
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bool[] charEscapeFlags, StringEscapeHandling stringEscapeHandling, IArrayPool<char>? bufferPool, ref char[]? writeBuffer)
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{
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// leading delimiter
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if (appendDelimiters)
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{
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writer.Write(delimiter);
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}
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if (!StringUtils.IsNullOrEmpty(s))
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{
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int lastWritePosition = FirstCharToEscape(s, charEscapeFlags, stringEscapeHandling);
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if (lastWritePosition == -1)
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{
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writer.Write(s);
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}
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else
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{
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if (lastWritePosition != 0)
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{
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if (writeBuffer == null || writeBuffer.Length < lastWritePosition)
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{
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writeBuffer = BufferUtils.EnsureBufferSize(bufferPool, lastWritePosition, writeBuffer);
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}
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// write unchanged chars at start of text.
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s.CopyTo(0, writeBuffer, 0, lastWritePosition);
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writer.Write(writeBuffer, 0, lastWritePosition);
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}
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int length;
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for (int i = lastWritePosition; i < s.Length; i++)
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{
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char c = s[i];
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if (c < charEscapeFlags.Length && !charEscapeFlags[c])
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{
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continue;
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}
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string? escapedValue;
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switch (c)
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{
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case '\t':
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escapedValue = @"\t";
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break;
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case '\n':
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escapedValue = @"\n";
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break;
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case '\r':
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escapedValue = @"\r";
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break;
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case '\f':
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escapedValue = @"\f";
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break;
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case '\b':
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escapedValue = @"\b";
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break;
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case '\\':
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escapedValue = @"\\";
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break;
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case '\u0085': // Next Line
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escapedValue = @"\u0085";
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break;
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case '\u2028': // Line Separator
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escapedValue = @"\u2028";
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break;
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case '\u2029': // Paragraph Separator
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escapedValue = @"\u2029";
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break;
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default:
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if (c < charEscapeFlags.Length || stringEscapeHandling == StringEscapeHandling.EscapeNonAscii)
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{
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if (c == '\'' && stringEscapeHandling != StringEscapeHandling.EscapeHtml)
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{
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escapedValue = @"\'";
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}
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else if (c == '"' && stringEscapeHandling != StringEscapeHandling.EscapeHtml)
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{
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escapedValue = @"\""";
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}
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else
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{
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if (writeBuffer == null || writeBuffer.Length < UnicodeTextLength)
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{
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writeBuffer = BufferUtils.EnsureBufferSize(bufferPool, UnicodeTextLength, writeBuffer);
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}
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StringUtils.ToCharAsUnicode(c, writeBuffer!);
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// slightly hacky but it saves multiple conditions in if test
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escapedValue = EscapedUnicodeText;
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}
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}
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else
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{
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escapedValue = null;
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}
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break;
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}
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if (escapedValue == null)
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{
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continue;
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}
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bool isEscapedUnicodeText = string.Equals(escapedValue, EscapedUnicodeText, StringComparison.Ordinal);
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if (i > lastWritePosition)
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{
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length = i - lastWritePosition + ((isEscapedUnicodeText) ? UnicodeTextLength : 0);
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int start = (isEscapedUnicodeText) ? UnicodeTextLength : 0;
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if (writeBuffer == null || writeBuffer.Length < length)
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{
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char[] newBuffer = BufferUtils.RentBuffer(bufferPool, length);
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// the unicode text is already in the buffer
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// copy it over when creating new buffer
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if (isEscapedUnicodeText)
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{
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MiscellaneousUtils.Assert(writeBuffer != null, "Write buffer should never be null because it is set when the escaped unicode text is encountered.");
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Array.Copy(writeBuffer, newBuffer, UnicodeTextLength);
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}
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BufferUtils.ReturnBuffer(bufferPool, writeBuffer);
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writeBuffer = newBuffer;
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}
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s.CopyTo(lastWritePosition, writeBuffer, start, length - start);
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// write unchanged chars before writing escaped text
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writer.Write(writeBuffer, start, length - start);
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}
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lastWritePosition = i + 1;
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if (!isEscapedUnicodeText)
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{
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writer.Write(escapedValue);
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}
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else
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{
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writer.Write(writeBuffer, 0, UnicodeTextLength);
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}
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}
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MiscellaneousUtils.Assert(lastWritePosition != 0);
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length = s.Length - lastWritePosition;
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if (length > 0)
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{
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if (writeBuffer == null || writeBuffer.Length < length)
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{
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writeBuffer = BufferUtils.EnsureBufferSize(bufferPool, length, writeBuffer);
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}
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s.CopyTo(lastWritePosition, writeBuffer, 0, length);
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// write remaining text
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writer.Write(writeBuffer, 0, length);
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}
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}
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}
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// trailing delimiter
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if (appendDelimiters)
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{
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writer.Write(delimiter);
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}
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}
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public static string ToEscapedJavaScriptString(string? value, char delimiter, bool appendDelimiters, StringEscapeHandling stringEscapeHandling)
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{
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bool[] charEscapeFlags = GetCharEscapeFlags(stringEscapeHandling, delimiter);
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using (StringWriter w = StringUtils.CreateStringWriter(value?.Length ?? 16))
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{
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char[]? buffer = null;
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WriteEscapedJavaScriptString(w, value, delimiter, appendDelimiters, charEscapeFlags, stringEscapeHandling, null, ref buffer);
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return w.ToString();
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}
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}
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private static int FirstCharToEscape(string s, bool[] charEscapeFlags, StringEscapeHandling stringEscapeHandling)
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{
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for (int i = 0; i != s.Length; i++)
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{
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char c = s[i];
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if (c < charEscapeFlags.Length)
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{
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if (charEscapeFlags[c])
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{
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return i;
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}
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}
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else if (stringEscapeHandling == StringEscapeHandling.EscapeNonAscii)
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{
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return i;
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}
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else
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{
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switch (c)
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{
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case '\u0085':
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case '\u2028':
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case '\u2029':
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return i;
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}
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}
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}
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return -1;
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}
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#if HAVE_ASYNC
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public static Task WriteEscapedJavaScriptStringAsync(TextWriter writer, string s, char delimiter, bool appendDelimiters, bool[] charEscapeFlags, StringEscapeHandling stringEscapeHandling, JsonTextWriter client, char[] writeBuffer, CancellationToken cancellationToken = default)
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{
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if (cancellationToken.IsCancellationRequested)
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{
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return cancellationToken.FromCanceled();
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}
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if (appendDelimiters)
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{
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return WriteEscapedJavaScriptStringWithDelimitersAsync(writer, s, delimiter, charEscapeFlags, stringEscapeHandling, client, writeBuffer, cancellationToken);
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}
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if (StringUtils.IsNullOrEmpty(s))
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{
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return cancellationToken.CancelIfRequestedAsync() ?? AsyncUtils.CompletedTask;
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}
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return WriteEscapedJavaScriptStringWithoutDelimitersAsync(writer, s, charEscapeFlags, stringEscapeHandling, client, writeBuffer, cancellationToken);
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}
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private static Task WriteEscapedJavaScriptStringWithDelimitersAsync(TextWriter writer, string s, char delimiter,
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bool[] charEscapeFlags, StringEscapeHandling stringEscapeHandling, JsonTextWriter client, char[] writeBuffer, CancellationToken cancellationToken)
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{
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Task task = writer.WriteAsync(delimiter, cancellationToken);
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if (!task.IsCompletedSucessfully())
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{
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return WriteEscapedJavaScriptStringWithDelimitersAsync(task, writer, s, delimiter, charEscapeFlags, stringEscapeHandling, client, writeBuffer, cancellationToken);
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}
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if (!StringUtils.IsNullOrEmpty(s))
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{
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task = WriteEscapedJavaScriptStringWithoutDelimitersAsync(writer, s, charEscapeFlags, stringEscapeHandling, client, writeBuffer, cancellationToken);
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if (task.IsCompletedSucessfully())
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{
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return writer.WriteAsync(delimiter, cancellationToken);
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}
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}
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return WriteCharAsync(task, writer, delimiter, cancellationToken);
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}
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private static async Task WriteEscapedJavaScriptStringWithDelimitersAsync(Task task, TextWriter writer, string s, char delimiter,
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bool[] charEscapeFlags, StringEscapeHandling stringEscapeHandling, JsonTextWriter client, char[] writeBuffer, CancellationToken cancellationToken)
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{
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await task.ConfigureAwait(false);
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if (!StringUtils.IsNullOrEmpty(s))
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{
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await WriteEscapedJavaScriptStringWithoutDelimitersAsync(writer, s, charEscapeFlags, stringEscapeHandling, client, writeBuffer, cancellationToken).ConfigureAwait(false);
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}
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await writer.WriteAsync(delimiter).ConfigureAwait(false);
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}
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public static async Task WriteCharAsync(Task task, TextWriter writer, char c, CancellationToken cancellationToken)
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{
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await task.ConfigureAwait(false);
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await writer.WriteAsync(c, cancellationToken).ConfigureAwait(false);
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}
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private static Task WriteEscapedJavaScriptStringWithoutDelimitersAsync(
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TextWriter writer, string s, bool[] charEscapeFlags, StringEscapeHandling stringEscapeHandling,
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JsonTextWriter client, char[] writeBuffer, CancellationToken cancellationToken)
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{
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int i = FirstCharToEscape(s, charEscapeFlags, stringEscapeHandling);
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return i == -1
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? writer.WriteAsync(s, cancellationToken)
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: WriteDefinitelyEscapedJavaScriptStringWithoutDelimitersAsync(writer, s, i, charEscapeFlags, stringEscapeHandling, client, writeBuffer, cancellationToken);
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}
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private static async Task WriteDefinitelyEscapedJavaScriptStringWithoutDelimitersAsync(
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TextWriter writer, string s, int lastWritePosition, bool[] charEscapeFlags,
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StringEscapeHandling stringEscapeHandling, JsonTextWriter client, char[] writeBuffer,
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CancellationToken cancellationToken)
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{
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if (writeBuffer == null || writeBuffer.Length < lastWritePosition)
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{
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writeBuffer = client.EnsureWriteBuffer(lastWritePosition, UnicodeTextLength);
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}
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if (lastWritePosition != 0)
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{
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s.CopyTo(0, writeBuffer, 0, lastWritePosition);
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// write unchanged chars at start of text.
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await writer.WriteAsync(writeBuffer, 0, lastWritePosition, cancellationToken).ConfigureAwait(false);
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}
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int length;
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bool isEscapedUnicodeText = false;
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string? escapedValue = null;
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for (int i = lastWritePosition; i < s.Length; i++)
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{
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char c = s[i];
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if (c < charEscapeFlags.Length && !charEscapeFlags[c])
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{
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continue;
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}
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switch (c)
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{
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case '\t':
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escapedValue = @"\t";
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break;
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case '\n':
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escapedValue = @"\n";
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break;
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case '\r':
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escapedValue = @"\r";
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break;
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case '\f':
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escapedValue = @"\f";
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break;
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case '\b':
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escapedValue = @"\b";
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break;
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case '\\':
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escapedValue = @"\\";
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break;
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case '\u0085': // Next Line
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escapedValue = @"\u0085";
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break;
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case '\u2028': // Line Separator
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escapedValue = @"\u2028";
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break;
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case '\u2029': // Paragraph Separator
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escapedValue = @"\u2029";
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break;
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default:
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if (c < charEscapeFlags.Length || stringEscapeHandling == StringEscapeHandling.EscapeNonAscii)
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{
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if (c == '\'' && stringEscapeHandling != StringEscapeHandling.EscapeHtml)
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{
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escapedValue = @"\'";
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}
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else if (c == '"' && stringEscapeHandling != StringEscapeHandling.EscapeHtml)
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{
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escapedValue = @"\""";
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}
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else
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{
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if (writeBuffer.Length < UnicodeTextLength)
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{
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writeBuffer = client.EnsureWriteBuffer(UnicodeTextLength, 0);
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}
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StringUtils.ToCharAsUnicode(c, writeBuffer);
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isEscapedUnicodeText = true;
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}
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}
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else
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{
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continue;
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}
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break;
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}
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if (i > lastWritePosition)
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{
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length = i - lastWritePosition + (isEscapedUnicodeText ? UnicodeTextLength : 0);
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int start = isEscapedUnicodeText ? UnicodeTextLength : 0;
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if (writeBuffer.Length < length)
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{
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writeBuffer = client.EnsureWriteBuffer(length, UnicodeTextLength);
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}
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s.CopyTo(lastWritePosition, writeBuffer, start, length - start);
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// write unchanged chars before writing escaped text
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await writer.WriteAsync(writeBuffer, start, length - start, cancellationToken).ConfigureAwait(false);
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}
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lastWritePosition = i + 1;
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if (!isEscapedUnicodeText)
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{
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await writer.WriteAsync(escapedValue!, cancellationToken).ConfigureAwait(false);
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}
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else
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{
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await writer.WriteAsync(writeBuffer, 0, UnicodeTextLength, cancellationToken).ConfigureAwait(false);
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isEscapedUnicodeText = false;
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}
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}
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length = s.Length - lastWritePosition;
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if (length != 0)
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{
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if (writeBuffer.Length < length)
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{
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writeBuffer = client.EnsureWriteBuffer(length, 0);
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}
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s.CopyTo(lastWritePosition, writeBuffer, 0, length);
|
|
|
|
// write remaining text
|
|
await writer.WriteAsync(writeBuffer, 0, length, cancellationToken).ConfigureAwait(false);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
public static bool TryGetDateFromConstructorJson(JsonReader reader, out DateTime dateTime, [NotNullWhen(false)]out string? errorMessage)
|
|
{
|
|
dateTime = default;
|
|
errorMessage = null;
|
|
|
|
if (!TryGetDateConstructorValue(reader, out long? t1, out errorMessage) || t1 == null)
|
|
{
|
|
errorMessage = errorMessage ?? "Date constructor has no arguments.";
|
|
return false;
|
|
}
|
|
if (!TryGetDateConstructorValue(reader, out long? t2, out errorMessage))
|
|
{
|
|
return false;
|
|
}
|
|
else if (t2 != null)
|
|
{
|
|
// Only create a list when there is more than one argument
|
|
List<long> dateArgs = new List<long>
|
|
{
|
|
t1.Value,
|
|
t2.Value
|
|
};
|
|
while (true)
|
|
{
|
|
if (!TryGetDateConstructorValue(reader, out long? integer, out errorMessage))
|
|
{
|
|
return false;
|
|
}
|
|
else if (integer != null)
|
|
{
|
|
dateArgs.Add(integer.Value);
|
|
}
|
|
else
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (dateArgs.Count > 7)
|
|
{
|
|
errorMessage = "Unexpected number of arguments when reading date constructor.";
|
|
return false;
|
|
}
|
|
|
|
// Pad args out to the number used by the ctor
|
|
while (dateArgs.Count < 7)
|
|
{
|
|
dateArgs.Add(0);
|
|
}
|
|
|
|
dateTime = new DateTime((int)dateArgs[0], (int)dateArgs[1] + 1, dateArgs[2] == 0 ? 1 : (int)dateArgs[2],
|
|
(int)dateArgs[3], (int)dateArgs[4], (int)dateArgs[5], (int)dateArgs[6]);
|
|
}
|
|
else
|
|
{
|
|
dateTime = DateTimeUtils.ConvertJavaScriptTicksToDateTime(t1.Value);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
private static bool TryGetDateConstructorValue(JsonReader reader, out long? integer, out string? errorMessage)
|
|
{
|
|
integer = null;
|
|
errorMessage = null;
|
|
|
|
if (!reader.Read())
|
|
{
|
|
errorMessage = "Unexpected end when reading date constructor.";
|
|
return false;
|
|
}
|
|
if (reader.TokenType == JsonToken.EndConstructor)
|
|
{
|
|
return true;
|
|
}
|
|
if (reader.TokenType != JsonToken.Integer)
|
|
{
|
|
errorMessage = "Unexpected token when reading date constructor. Expected Integer, got " + reader.TokenType;
|
|
return false;
|
|
}
|
|
|
|
integer = (long)reader.Value!;
|
|
return true;
|
|
}
|
|
}
|
|
} |