public static bool CoerceArgument(out object clr, Type ty, Variable var)
{
P6any obj = var.Fetch();
clr = null;
// type objects are typed nulls
if (!obj.IsDefined())
{
if (obj is BoxObject <object> )
{
Type t = obj.mo.box_type;
// is this enough?
return(ty.IsAssignableFrom(t) && !ty.IsValueType &&
ty != typeof(void));
}
else if (obj.mo == Kernel.MuMO || obj.mo == Kernel.AnyMO)
{
// untyped-ish null
return(!ty.IsValueType && ty != typeof(void));
}
else
{
// we'll pass this by value anyway
clr = obj;
return(ty.IsAssignableFrom(obj.GetType()));
}
}
// in all other cases we're definitely passing a non-null value
// Boolean values marshal to bool
if (obj.Does(Kernel.BoolMO))
{
clr = Kernel.UnboxAny <int>(obj) != 0;
}
// note, Bool ~~ Int ~~ Integral
else if (obj.Does(Kernel.IntegralMO))
{
// important type directed case!
int small;
BigInteger big;
bool use_big = Builtins.GetAsInteger(var, out small, out big);
if (ty == typeof(sbyte))
{
clr = (!use_big && small >= sbyte.MinValue && small <= sbyte.MaxValue) ? (object)(sbyte)small : null;
}
else if (ty == typeof(byte))
{
clr = (!use_big && small >= byte.MinValue && small <= byte.MaxValue) ? (object)(byte)small : null;
}
else if (ty == typeof(short))
{
clr = (!use_big && small >= short.MinValue && small <= short.MaxValue) ? (object)(short)small : null;
}
else if (ty == typeof(ushort))
{
clr = (!use_big && small >= ushort.MinValue && small <= ushort.MaxValue) ? (object)(ushort)small : null;
}
else
{
big = use_big ? big : (BigInteger)small;
if (ty == typeof(int))
{
clr = (big >= int.MinValue && big <= int.MaxValue) ? (object)(int)big : null;
}
else if (ty == typeof(uint))
{
clr = (big >= uint.MinValue && big <= uint.MaxValue) ? (object)(uint)big : null;
}
else if (ty == typeof(long))
{
clr = (big >= long.MinValue && big <= long.MaxValue) ? (object)(long)big : null;
}
else if (ty == typeof(ulong))
{
clr = (big >= ulong.MinValue && big <= ulong.MaxValue) ? (object)(ulong)big : null;
}
else if (ty == typeof(float))
{
clr = (object)(float)big;
}
else if (ty == typeof(double))
{
clr = (object)(double)big;
}
else if (ty == typeof(decimal))
{
clr = big.GetWords().Length <= 3 ? (object)(decimal)big : null;
}
else if (ty == typeof(object))
{
clr = use_big ? null : (object)small;
}
else
{
clr = obj;
}
}
}
else if (obj.Does(Kernel.RealMO))
{
// fractional value
if (ty == typeof(decimal))
{
// decimal is for people who care about exactness
int rk;
P6any n = Builtins.GetNumber(var, obj, out rk);
BigInteger num, den;
if (rk == Builtins.NR_FATRAT)
{
FatRat r = Kernel.UnboxAny <FatRat>(n);
num = r.num; den = r.den;
}
else if (rk == Builtins.NR_FIXRAT)
{
Rat r = Kernel.UnboxAny <Rat>(n);
num = r.num; den = r.den;
}
else if (rk == Builtins.NR_BIGINT)
{
num = Kernel.UnboxAny <BigInteger>(n); den = BigInteger.One;
}
else if (rk == Builtins.NR_FIXINT)
{
num = Kernel.UnboxAny <int>(n); den = BigInteger.One;
}
else
{
return(false);
}
BigInteger div, rem;
int scale = 0;
while (true)
{
div = BigInteger.DivRem(den, 10, out rem);
if (rem.Sign != 0)
{
break;
}
den = div;
scale++;
}
while (true)
{
div = BigInteger.DivRem(den, 5, out rem);
if (rem.Sign != 0)
{
break;
}
den = div;
num *= 2;
scale++;
}
while (true)
{
div = BigInteger.DivRem(den, 2, out rem);
if (rem.Sign != 0)
{
break;
}
den = div;
num *= 5;
scale++;
}
if (den != BigInteger.One)
{
return(false);
}
if (scale > 28)
{
return(false);
}
int[] bits = decimal.GetBits((decimal)num);
bits[3] = scale << 16;
clr = new decimal(bits);
}
else
{
double val = obj.mo.mro_raw_Numeric.Get(var);
if (ty == typeof(float))
{
clr = (object)(float)val;
}
else if (ty == typeof(double) || ty == typeof(object))
{
clr = (object)val;
}
}
}
else if (obj.Does(Kernel.StrMO))
{
string s = Kernel.UnboxAny <string>(obj);
if (ty == typeof(char) && s.Length == 1)
{
clr = s[0];
}
else if (ty == typeof(string))
{
clr = s;
}
else if (ty == typeof(object))
{
clr = s;
}
else
{
clr = obj;
}
}
// "Callable"
else if (typeof(Delegate).IsAssignableFrom(ty))
{
MethodInfo needed = ty.GetMethod("Invoke");
ParameterInfo[] pi = needed.GetParameters();
if (pi.Length >= 10)
{
clr = null;
}
else if (needed.ReturnType != typeof(void))
{
Type[] args = new Type[pi.Length + 1];
args[0] = needed.ReturnType;
for (int i = 0; i < pi.Length; i++)
{
args[i + 1] = pi[i].ParameterType;
}
MethodInfo compat = delegate_methods[pi.Length * 2 + 1].
MakeGenericMethod(args);
clr = Delegate.CreateDelegate(ty, obj, compat);
}
else
{
Type[] args = new Type[pi.Length];
for (int i = 0; i < pi.Length; i++)
{
args[i] = pi[i].ParameterType;
}
MethodInfo compat = delegate_methods[pi.Length * 2];
if (args.Length != 0)
{
compat = compat.MakeGenericMethod(args);
}
clr = Delegate.CreateDelegate(ty, obj, compat);
}
}
else if (obj is BoxObject <object> )
{
clr = Kernel.UnboxAny <object>(obj);
}
else
{
clr = obj;
}
return(clr != null && ty.IsAssignableFrom(clr.GetType()));
}