public static T Initialize <T>([NotNull] ref T?target, T value) where T : class
{
RoslynDebug.Assert((object?)value != null);
return(Interlocked.CompareExchange(ref target, value, null) ?? value);
}
public V Single()
{
RoslynDebug.Assert(_value is V); // Implies value != null
return((V)_value);
}
internal static void AppendData(this IncrementalHash hash, ArraySegment <byte> segment)
{
RoslynDebug.AssertNotNull(segment.Array);
hash.AppendData(segment.Array, segment.Offset, segment.Count);
}
// String escaping implementation forked from System.Runtime.Serialization.Json to
// avoid a large dependency graph for this small amount of code:
//
// https://github.com/dotnet/corefx/blob/master/src/System.Private.DataContractSerialization/src/System/Runtime/Serialization/Json/JavaScriptString.cs
//
private static string EscapeString(string?value)
{
PooledStringBuilder?pooledBuilder = null;
StringBuilder? b = null;
if (RoslynString.IsNullOrEmpty(value))
{
return(string.Empty);
}
int startIndex = 0;
int count = 0;
for (int i = 0; i < value.Length; i++)
{
char c = value[i];
if (c == '\"' || c == '\\' || ShouldAppendAsUnicode(c))
{
if (b == null)
{
RoslynDebug.Assert(pooledBuilder == null);
pooledBuilder = PooledStringBuilder.GetInstance();
b = pooledBuilder.Builder;
}
if (count > 0)
{
b.Append(value, startIndex, count);
}
startIndex = i + 1;
count = 0;
switch (c)
{
case '\"':
b.Append("\\\"");
break;
case '\\':
b.Append("\\\\");
break;
default:
Debug.Assert(ShouldAppendAsUnicode(c));
AppendCharAsUnicode(b, c);
break;
}
}
else
{
count++;
}
}
if (b == null)
{
return(value);
}
else
{
RoslynDebug.Assert(pooledBuilder is object);
}
if (count > 0)
{
b.Append(value, startIndex, count);
}
return(pooledBuilder.ToStringAndFree());
}
