protected OperatorImplementation AddUnary(ExpressionType op, Type commonType, UnaryOperatorMethod unaryMethod)
{
var key = new OperatorDispatchKey(op, commonType);
var impl = new OperatorImplementation(key, commonType, null, unaryMethod, null, null);
OperatorImplementations[key] = impl;
return(impl);
}
protected OperatorImplementation AddConverter(Type fromType, Type toType, UnaryOperatorMethod method)
{
var key = new OperatorDispatchKey(ExpressionType.ConvertChecked, fromType, toType);
var impl = new OperatorImplementation(key, toType, method);
OperatorImplementations[key] = impl;
return(impl);
}
protected OperatorImplementation AddBinary(ExpressionType op, Type commonType, BinaryOperatorMethod binaryMethod,
UnaryOperatorMethod resultConverter)
{
var key = new OperatorDispatchKey(op, commonType, commonType);
var impl = new OperatorImplementation(key, commonType, binaryMethod, null, null, resultConverter);
OperatorImplementations[key] = impl;
return(impl);
}
protected OperatorImplementation CreateBinaryOperatorImplementation(ExpressionType op, Type arg1Type, Type arg2Type,
Type commonType, BinaryOperatorMethod method, UnaryOperatorMethod resultConverter)
{
OperatorDispatchKey key = new OperatorDispatchKey(op, arg1Type, arg2Type);
UnaryOperatorMethod arg1Converter = arg1Type == commonType ? null : GetConverter(arg1Type, commonType);
UnaryOperatorMethod arg2Converter = arg2Type == commonType ? null : GetConverter(arg2Type, commonType);
var impl = new OperatorImplementation(key, commonType, method,
arg1Converter, arg2Converter, resultConverter);
return(impl);
}
private static bool CanOverflow(OperatorImplementation impl)
{
if (!CanOverflow(impl.Key.Op))
{
return(false);
}
if (impl.CommonType == typeof(double) || impl.CommonType == typeof(float))
{
return(false);
}
return(true);
}
public object ExecuteUnaryOperator(ExpressionType op, object arg1, ref OperatorImplementation previousUsed)
{
Type arg1Type;
try
{
arg1Type = arg1.GetType();
}
catch (NullReferenceException)
{
CheckUnassigned(arg1);
throw;
}
OperatorDispatchKey key;
var currentImpl = previousUsed;
if (currentImpl != null && arg1Type != currentImpl.Key.Arg1Type)
{
currentImpl = null;
}
if (currentImpl == null)
{
key = new OperatorDispatchKey(op, arg1Type);
if (!OperatorImplementations.TryGetValue(key, out currentImpl))
{
throw new ScriptException($"Op(<{op}> <{arg1Type.Name}>) not defined!");
}
}
try
{
previousUsed = currentImpl;
return(currentImpl.Arg1Converter(arg1));
}
catch (OverflowException)
{
if (currentImpl.OverflowHandler == null)
{
throw;
}
previousUsed = currentImpl.OverflowHandler;
return(ExecuteUnaryOperator(op, arg1, ref previousUsed));
}
}
