private static ParameterSyntax DecorateWithQualifiers(this ParameterSyntax @this,
ITypeSymbol parameterType, IParameterSymbol parameterSymbol, string returnType)
{
var parameterTypeKind = parameterType.TypeKind;
switch (parameterTypeKind)
{
case TypeKind.Unknown:
case TypeKind.Class:
case TypeKind.Delegate:
case TypeKind.Dynamic:
case TypeKind.Enum:
case TypeKind.Error:
case TypeKind.Interface:
case TypeKind.Module:
case TypeKind.Struct:
case TypeKind.TypeParameter:
case TypeKind.Submission:
@this = @this.WithType(IdentifierName(returnType.ToIdentifier()));
break;
case TypeKind.Array:
var arrayTypeSymbol = (IArrayTypeSymbol)parameterType;
var elementType = arrayTypeSymbol.ElementType.SimplifyTypeName();
if (parameterSymbol.IsParams)
{
@this = @this.DecorateWithArray(elementType);
}
else
{
var rank = arrayTypeSymbol.Rank;
if (rank >= 2)
{
var rankTokens = GetRankTokens(rank);
@this = @this.WithType(
ArrayType(
IdentifierName(elementType)
)
.WithRankSpecifiers(
SingletonList(
ArrayRankSpecifier(
SeparatedList <ExpressionSyntax>(
rankTokens
)
)
.WithCloseBracketToken(
SyntaxKind.CloseBracketToken.BuildToken(Array.Empty <SyntaxTrivia>(),
new[] { Space }))
)
)
);
}
else
{
@this = @this.DecorateWithArray(elementType);
}
}
break;
case TypeKind.Pointer:
var pointerTypeSymbol = (IPointerTypeSymbol)parameterType;
var pointedType = pointerTypeSymbol.PointedAtType.SimplifyTypeName();
@this = @this.WithType(
PointerType(
IdentifierName(Identifier(pointedType))
)
.WithAsteriskToken(SyntaxKind.AsteriskToken.BuildToken(Array.Empty <SyntaxTrivia>(), new[] { Space }))
);
break;
default:
throw new ArgumentOutOfRangeException(nameof(parameterTypeKind));
}
return(@this);
}