private static bool?GetEmitDefaultValueFromAttributes(AttributedMembers attrMembers, Location?location, ImmutableArray <AttributeSyntax> attrs, ref ImmutableArray <Diagnostic> diags)
{
var(emitsByte, emitsBool) = Utils.GetConstantsWithName <byte, bool>(attrMembers, attrs, "EmitDefaultValue", ref diags);
var total = emitsByte.Length + emitsBool.Length;
if (total > 1)
{
var diag = Diagnostics.EmitDefaultValueSpecifiedMultipleTimes(location);
diags = diags.Add(diag);
return(null);
}
if (total == 0)
{
return(null);
}
if (emitsByte.Length == 1)
{
var byteVal = emitsByte.Single();
var logicalVal =
byteVal switch
{
1 => true,
2 => false,
_ => default(bool?)
};
if (logicalVal == null)
{
var diag = Diagnostics.UnexpectedConstantValue(location, byteVal.ToString(), new[] { "Yes", "No" });
diags = diags.Add(diag);
return(null);
}
return(logicalVal);
}
var boolVal = emitsBool.Single();
return(boolVal);
}
}
