private static bool TryReplaceChar(char c, out string replaceWith)
{
replaceWith = null;
switch (c)
{
case char.MinValue:
replaceWith = "\\0";
break;
case '\a':
replaceWith = "\\a";
break;
case '\b':
replaceWith = "\\b";
break;
case '\t':
replaceWith = "\\t";
break;
case '\n':
replaceWith = "\\n";
break;
case '\v':
replaceWith = "\\v";
break;
case '\f':
replaceWith = "\\f";
break;
case '\r':
replaceWith = "\\r";
break;
case '\\':
replaceWith = "\\\\";
break;
}
if (replaceWith != null)
{
return(true);
}
if (!ObjectDisplay.NeedsEscaping(CharUnicodeInfo.GetUnicodeCategory(c)))
{
return(false);
}
replaceWith = "\\u" + ((int)c).ToString("x4");
return(true);
}
public static string FormatLiteral(string value, ObjectDisplayOptions options)
{
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
StringBuilder builder = new StringBuilder();
bool flag1 = options.IncludesOption(ObjectDisplayOptions.UseQuotes);
bool flag2 = options.IncludesOption(ObjectDisplayOptions.EscapeNonPrintableCharacters);
bool flag3 = flag1 && !flag2 && ObjectDisplay.ContainsNewLine(value);
if (flag1)
{
if (flag3)
{
builder.Append('@');
}
builder.Append('"');
}
for (int index = 0; index < value.Length; ++index)
{
char ch = value[index];
if (flag2 && CharUnicodeInfo.GetUnicodeCategory(ch) == UnicodeCategory.Surrogate)
{
UnicodeCategory unicodeCategory = CharUnicodeInfo.GetUnicodeCategory(value, index);
if (unicodeCategory == UnicodeCategory.Surrogate)
{
builder.Append("\\u" + ((int)ch).ToString("x4"));
}
else if (ObjectDisplay.NeedsEscaping(unicodeCategory))
{
int utf32 = char.ConvertToUtf32(value, index);
builder.Append("\\U" + utf32.ToString("x8"));
++index;
}
else
{
builder.Append(ch);
builder.Append(value[++index]);
}
}
else
{
string replaceWith;
if (flag2 && ObjectDisplay.TryReplaceChar(ch, out replaceWith))
{
builder.Append(replaceWith);
}
else if (flag1 && ch == '"')
{
if (flag3)
{
builder.Append('"');
builder.Append('"');
}
else
{
builder.Append('\\');
builder.Append('"');
}
}
else
{
builder.Append(ch);
}
}
}
if (flag1)
{
builder.Append('"');
}
return(builder.ToString());
}