pos/is4c-nf/scale-drivers/drivers/NewMagellan/Newtonsoft.Json/Utilities/JavaScriptUtils.cs
#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;
#if NET20
using Newtonsoft.Json.Utilities.LinqBridge;
#else
using System.Linq;
#endif
namespace Newtonsoft.Json.Utilities
{
internal static class JavaScriptUtils
{
internal static readonly bool[] SingleQuoteCharEscapeFlags = new bool[128];
internal static readonly bool[] DoubleQuoteCharEscapeFlags = new bool[128];
internal static readonly bool[] HtmlCharEscapeFlags = new bool[128];
static JavaScriptUtils()
{
IList<char> escapeChars = new List<char>
{
'\n', '\r', '\t', '\\', '\f', '\b',
};
for (int i = 0; i < ' '; i++)
{
escapeChars.Add((char)i);
}
foreach (var escapeChar in escapeChars.Union(new[] { '\'' }))
{
SingleQuoteCharEscapeFlags[escapeChar] = true;
}
foreach (var escapeChar in escapeChars.Union(new[] { '"' }))
{
DoubleQuoteCharEscapeFlags[escapeChar] = true;
}
foreach (var escapeChar in escapeChars.Union(new[] { '"', '\'', '<', '>', '&' }))
{
HtmlCharEscapeFlags[escapeChar] = true;
}
}
private const string EscapedUnicodeText = "!";
public static bool[] GetCharEscapeFlags(StringEscapeHandling stringEscapeHandling, char quoteChar)
{
if (stringEscapeHandling == StringEscapeHandling.EscapeHtml)
return HtmlCharEscapeFlags;
if (quoteChar == '"')
return DoubleQuoteCharEscapeFlags;
return SingleQuoteCharEscapeFlags;
}
public static bool ShouldEscapeJavaScriptString(string s, bool[] charEscapeFlags)
{
if (s == null)
return false;
foreach (char c in s)
{
if (c >= charEscapeFlags.Length || charEscapeFlags[c])
return true;
}
return false;
}
public static void WriteEscapedJavaScriptString(TextWriter writer, string s, char delimiter, bool appendDelimiters,
bool[] charEscapeFlags, StringEscapeHandling stringEscapeHandling, ref char[] writeBuffer)
{
// leading delimiter
if (appendDelimiters)
writer.Write(delimiter);
if (s != null)
{
int lastWritePosition = 0;
for (int i = 0; i < s.Length; i++)
{
var c = s[i];
if (c < charEscapeFlags.Length && !charEscapeFlags[c])
continue;
string escapedValue;
switch (c)
{
case '\t':
escapedValue = @"\t";
break;
case '\n':
escapedValue = @"\n";
break;
case '\r':
escapedValue = @"\r";
break;
case '\f':
escapedValue = @"\f";
break;
case '\b':
escapedValue = @"\b";
break;
case '\\':
escapedValue = @"\\";
break;
case '\u0085': // Next Line
escapedValue = @"\u0085";
break;
case '\u2028': // Line Separator
escapedValue = @"\u2028";
break;
case '\u2029': // Paragraph Separator
escapedValue = @"\u2029";
break;
default:
if (c < charEscapeFlags.Length || stringEscapeHandling == StringEscapeHandling.EscapeNonAscii)
{
if (c == '\'' && stringEscapeHandling != StringEscapeHandling.EscapeHtml)
{
escapedValue = @"\'";
}
else if (c == '"' && stringEscapeHandling != StringEscapeHandling.EscapeHtml)
{
escapedValue = @"\""";
}
else
{
if (writeBuffer == null)
writeBuffer = new char[6];
StringUtils.ToCharAsUnicode(c, writeBuffer);
// slightly hacky but it saves multiple conditions in if test
escapedValue = EscapedUnicodeText;
}
}
else
{
escapedValue = null;
}
break;
}
if (escapedValue == null)
continue;
bool isEscapedUnicodeText = string.Equals(escapedValue, EscapedUnicodeText);
if (i > lastWritePosition)
{
int length = i - lastWritePosition + ((isEscapedUnicodeText) ? 6 : 0);
int start = (isEscapedUnicodeText) ? 6 : 0;
if (writeBuffer == null || writeBuffer.Length < length)
{
char[] newBuffer = new char[length];
// the unicode text is already in the buffer
// copy it over when creating new buffer
if (isEscapedUnicodeText)
Array.Copy(writeBuffer, newBuffer, 6);
writeBuffer = newBuffer;
}
s.CopyTo(lastWritePosition, writeBuffer, start, length - start);
// write unchanged chars before writing escaped text
writer.Write(writeBuffer, start, length - start);
}
lastWritePosition = i + 1;
if (!isEscapedUnicodeText)
writer.Write(escapedValue);
else
writer.Write(writeBuffer, 0, 6);
}
if (lastWritePosition == 0)
{
// no escaped text, write entire string
writer.Write(s);
}
else
{
int length = s.Length - lastWritePosition;
if (writeBuffer == null || writeBuffer.Length < length)
writeBuffer = new char[length];
s.CopyTo(lastWritePosition, writeBuffer, 0, length);
// write remaining text
writer.Write(writeBuffer, 0, length);
}
}
// trailing delimiter
if (appendDelimiters)
writer.Write(delimiter);
}
public static string ToEscapedJavaScriptString(string value, char delimiter, bool appendDelimiters)
{
return ToEscapedJavaScriptString(value, delimiter, appendDelimiters, StringEscapeHandling.Default);
}
public static string ToEscapedJavaScriptString(string value, char delimiter, bool appendDelimiters, StringEscapeHandling stringEscapeHandling)
{
bool[] charEscapeFlags = GetCharEscapeFlags(stringEscapeHandling, delimiter);
using (StringWriter w = StringUtils.CreateStringWriter(StringUtils.GetLength(value) ?? 16))
{
char[] buffer = null;
WriteEscapedJavaScriptString(w, value, delimiter, appendDelimiters, charEscapeFlags, stringEscapeHandling, ref buffer);
return w.ToString();
}
}
}
}