public static void Go(ScalaWriter writer, CastExpressionSyntax expression)
{
var model = Program.GetModel(expression);
var symbol = model.GetSymbolInfo(expression);
var castingFrom = model.GetTypeInfo(expression.Expression).Type;
if (castingFrom == null)
{
castingFrom = model.GetTypeInfo(expression).Type;
}
var srcTypeScala = TypeProcessor.ConvertType((ITypeSymbol)castingFrom);
var destType = model.GetTypeInfo(expression.Type).Type;
var destTypeScala = TypeProcessor.TryConvertType(expression.Type);
if (destTypeScala == srcTypeScala)
{
//Eat casts where the types are identical. Enums getting casted to int fall here, and since we use ints to represent enums anyway, it's not necessary.
Core.Write(writer, expression.Expression);
}
else if (symbol.Symbol != null && srcTypeScala != "Int" && srcTypeScala != "String" && srcTypeScala != "Bool")
{
//when the symbol is non-null, this indicates we're calling a cast operator function
writer.Write(TypeProcessor.ConvertType(symbol.Symbol.ContainingType));
writer.Write(".op_Explicit_");
writer.Write(destTypeScala.TrySubstringBeforeFirst('[').Replace('.', '_'));
writer.Write("(");
Core.Write(writer, expression.Expression);
writer.Write(")");
}
else if (TypeProcessor.IsPrimitiveType(srcTypeScala) && TypeProcessor.IsPrimitiveType(destTypeScala))
{
if (srcTypeScala == "Byte")
{
//JVM's bytes are signed, so we must take care when upcasting
writer.Write("System.CsScala.ByteTo");
writer.Write(destTypeScala);
writer.Write("(");
Core.Write(writer, expression.Expression);
writer.Write(")");
}
else
{
//Casting between primitives is handled in scala bo the .toXX functions
Core.Write(writer, expression.Expression);
writer.Write(".to");
writer.Write(destTypeScala);
}
}
else
{
Core.Write(writer, expression.Expression);
writer.Write(".asInstanceOf[");
writer.Write(destTypeScala);
writer.Write("]");
}
}