internal static DeclarationModifiers CheckModifiers(
DeclarationModifiers modifiers,
DeclarationModifiers allowedModifiers,
Location errorLocation,
BindingDiagnosticBag diagnostics,
SyntaxTokenList?modifierTokens,
out bool modifierErrors)
{
modifierErrors = false;
DeclarationModifiers reportStaticNotVirtualForModifiers = DeclarationModifiers.None;
if ((modifiers & allowedModifiers & DeclarationModifiers.Static) != 0)
{
reportStaticNotVirtualForModifiers = allowedModifiers & (DeclarationModifiers.Override | DeclarationModifiers.Virtual);
allowedModifiers &= ~reportStaticNotVirtualForModifiers;
}
DeclarationModifiers errorModifiers = modifiers & ~allowedModifiers;
DeclarationModifiers result = modifiers & allowedModifiers;
while (errorModifiers != DeclarationModifiers.None)
{
DeclarationModifiers oneError = errorModifiers & ~(errorModifiers - 1);
Debug.Assert(oneError != DeclarationModifiers.None);
errorModifiers = errorModifiers & ~oneError;
switch (oneError)
{
case DeclarationModifiers.Partial:
// Provide a specialized error message in the case of partial.
ReportPartialError(errorLocation, diagnostics, modifierTokens);
break;
case DeclarationModifiers.Override:
case DeclarationModifiers.Virtual:
if ((reportStaticNotVirtualForModifiers & oneError) == 0)
{
goto default;
}
diagnostics.Add(ErrorCode.ERR_StaticNotVirtual, errorLocation, ModifierUtils.ConvertSingleModifierToSyntaxText(oneError));
break;
default:
diagnostics.Add(ErrorCode.ERR_BadMemberFlag, errorLocation, ConvertSingleModifierToSyntaxText(oneError));
break;
}
modifierErrors = true;
}
if ((result & DeclarationModifiers.PrivateProtected) != 0)
{
modifierErrors |= !Binder.CheckFeatureAvailability(errorLocation.SourceTree, MessageID.IDS_FeaturePrivateProtected, diagnostics, errorLocation);
}
return(result);
}
static bool reportBadMemberFlagIfAny(DeclarationModifiers result, DeclarationModifiers modifier, BindingDiagnosticBag diagnostics, SourceLocation errorLocation)
{
if ((result & modifier) != 0)
{
// The modifier '{0}' is not valid for this item
diagnostics.Add(ErrorCode.ERR_BadMemberFlag, errorLocation, ModifierUtils.ConvertSingleModifierToSyntaxText(modifier));
return(true);
}
return(false);
}
