public void Test3()
{
using var builder = new StringBuilderSlim();
for (var i = 0; i < 256; ++i)
{
builder.Clear();
builder.Add("abcdefghijklmnopqrstuvwxyz"); Assert.Equal("abcdefghijklmnopqrstuvwxyz", builder.ToString());
}
}
/// <summary>
/// Converts the logged trace record int this instance to its equivalent string representation
/// using the specified culture-specific format information.
/// </summary>
/// <param name="format"></param>
/// <param name="formatProvider"></param>
/// <returns></returns>
/// <remarks>
/// <para>For this method, following style format is available:</para>
/// <para><c>%[<alignment>]<content-key>[(<format-string>)]</c></para>
/// <para>Each content-key is case insensitive.</para>
/// <para>Ampersand (U+0026) is escape sequence and the next one character is export as it is.</para>
/// <para>This format is equivalent to <c>{<content-key>[,<alignment>][:<format-string>]}</c> under .Net format string.</para>
/// <para>Following content keys are available'</para>
/// <list type="bullet">
/// <item>
/// <term>K</term>
/// <description>[<see cref="String"/>] Operator key.</description>
/// </item>
/// <item>
/// <term>S</term>
/// <description>[<see cref="Int64"/>] Subscription index.</description>
/// </item>
/// <item>
/// <term>I</term>
/// <description>[<see cref="Int64"/>] Value index.</description>
/// </item>
/// <item>
/// <term>P</term>
/// <description>[<see cref="Int32"/>] Managed thread ID.</description>
/// </item>
/// <item>
/// <term>T</term>
/// <description>[<see cref="TimeSpan"/>] Total duration.</description>
/// </item>
/// <item>
/// <term>L</term>
/// <description>[<see cref="TimeSpan"/>] Lap duration.</description>
/// </item>
/// <item>
/// <term>V</term>
/// <description>[<typeparamref name="T"/>] Value</description>
/// </item>
/// </list>
/// </remarks>
/// <example>
/// <para>Followings are examples of format and its result.</para>
/// <list type="bullet">
/// <item>
/// <term><c>%K-%04S(X)-%04I(X)</c></term>
/// <description><c>sometrace-0002-00C1</c></description>
/// </item>
/// <item>
/// <term><c>&%%T(d\Dhh\:mm\:ss\.fff)&%</c></term>
/// <description><c>%0D00:00:05.500%</c></description>
/// </item>
/// <item>
/// <term><c>%L(s\.fff)/%T(s\.fff)</c></term>
/// <description><c>0.342/5.586</c></description>
/// </item>
/// </list>
/// </example>
public string ToString(string format, IFormatProvider formatProvider)
{
const int raw = 0;
const int beginReplacement = 1;
const int elementSpecified = 2;
const int formatting = 3;
formatProvider ??= CultureInfo.CurrentCulture;
if (string.IsNullOrEmpty(format))
{
return(string.Format(
formatProvider,
"Observable trace {0}-{1}-{2}: thread={3}, total duration={4}, lap duration={5}, value={6}",
OperatorKey, SubscriptionIndex, ValueIndex,
ManagedThreadId, TotalDuration, LapDuration, Value));
}
var result = new StringBuilder();
var escaped = false;
var state = raw;
var elemKey = default(char);
var alignment = default(string);
var elemFmtStr = default(string);
var builder = new StringBuilderSlim();
void popCurrentFormat()
{
if (elemKey == '\0')
{
return;
}
var fmt = "{0";
if (!string.IsNullOrEmpty(alignment))
{
fmt += "," + alignment;
}
if (!string.IsNullOrEmpty(elemFmtStr))
{
fmt += ":" + elemFmtStr;
}
fmt += "}";
var retval = char.ToUpper(elemKey) switch
{
'K' => string.Format(formatProvider, fmt, OperatorKey),
'S' => string.Format(formatProvider, fmt, SubscriptionIndex),
'I' => string.Format(formatProvider, fmt, ValueIndex),
'P' => string.Format(formatProvider, fmt, ManagedThreadId),
'T' => string.Format(formatProvider, fmt, TotalDuration),
'L' => string.Format(formatProvider, fmt, LapDuration),
'V' => string.Format(formatProvider, fmt, Value),
_ => throw new InvalidOperationException(),
};
elemKey = default;
alignment = default;
elemFmtStr = default;
result.Append(retval);
}
foreach (var c in format)
{
if (escaped)
{
builder.Add(c);
escaped = false;
continue;
}
switch (state)
{
case raw:
switch (c)
{
case EscapePrefix:
escaped = true;
continue;
case '%':
result.Append(builder.ToString());
builder.Clear();
state = beginReplacement;
continue;
default:
builder.Add(c);
continue;
}
case beginReplacement:
switch (c)
{
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
builder.Add(c);
continue;
case '-':
if (builder.Length == 0)
{
goto case '0';
}
else
{
goto default;
}
case 'K':
case 'S':
case 'I':
case 'P':
case 'T':
case 'L':
case 'V':
case 'k':
case 's':
case 'i':
case 'p':
case 't':
case 'l':
case 'v':
alignment = builder.ToString();
builder.Clear();
elemKey = c;
state = elementSpecified;
continue;
default:
throw new FormatException();
}
case elementSpecified:
switch (c)
{
case EscapePrefix:
popCurrentFormat();
escaped = true;
state = raw;
continue;
case '(':
state = formatting;
continue;
default:
state = raw;
popCurrentFormat();
builder.Add(c);
continue;
}
case formatting:
switch (c)
{
case EscapePrefix:
escaped = true;
continue;
case ')':
elemFmtStr = builder.ToString();
builder.Clear();
state = raw;
popCurrentFormat();
continue;
default:
builder.Add(c);
continue;
}
default:
throw new InvalidOperationException();
}
}
switch (state)
{
case raw:
result.Append(builder.ToString());
builder.Clear();
break;
case elementSpecified:
popCurrentFormat();
break;
case beginReplacement:
case formatting:
default:
throw new FormatException();
}
return(result.ToString());
}