private static bool _tryConvertToPair(
StackContext sctx, PValue inpv, out PValueKeyValuePair result)
{
PValue res;
result = null;
if (!inpv.TryConvertTo(sctx, typeof (PValueKeyValuePair), out res))
return false;
else
result = (PValueKeyValuePair) res.Value;
return true;
}
private static bool _tryConvertToInt(
StackContext sctx, PValue operand, out int value, bool allowNull)
{
value = -1337; //should never surface as value is only used if the method returns true
switch (operand.Type.ToBuiltIn())
{
case BuiltIn.Int:
value = Convert.ToInt32(operand.Value);
return true;
/*
case BuiltIn.String:
string rawRight = operand.Value as string;
if (!int.TryParse(rawRight, out value))
value = 0;
return true; //*/
case BuiltIn.Object:
PValue pvRight;
if (operand.TryConvertTo(sctx, Int, out pvRight))
{
value = (int) pvRight.Value;
return true;
}
break;
case BuiltIn.Null:
value = 0;
return allowNull;
default:
break;
}
return false;
}
private bool _tryConvert(StackContext sctx, PValue pv, out char c)
{
c = '\0';
switch (pv.Type.ToBuiltIn())
{
case BuiltIn.Char:
c = (char) pv.Value;
return true;
case BuiltIn.Int:
c = (char) (int) pv.Value;
return true;
case BuiltIn.Null:
return true;
case BuiltIn.String:
var s = (string) pv.Value;
if (s.Length == 1)
{
c = s[0];
return true;
}
else
{
return false;
}
case BuiltIn.Object:
if (pv.TryConvertTo(sctx, Char, false, out pv))
return _tryConvert(sctx, pv, out c);
else
return false;
case BuiltIn.Structure:
case BuiltIn.Hash:
case BuiltIn.List:
case BuiltIn.Bool:
case BuiltIn.None:
case BuiltIn.Real:
return false;
default:
throw new ArgumentOutOfRangeException();
}
}
/// <summary>
/// Tries to turn a generic PValue object into an <see cref = "IEnumerable{PValue}" /> if possible. Returns null if <paramref
/// name = "psource" /> cannot be enumerated over.
/// </summary>
/// <param name = "sctx"></param>
/// <param name = "psource"></param>
/// <returns></returns>
internal static IEnumerable<PValue> _ToEnumerable(StackContext sctx, PValue psource)
{
switch (psource.Type.ToBuiltIn())
{
case PType.BuiltIn.List:
return (IEnumerable<PValue>) psource.Value;
case PType.BuiltIn.Object:
var clrType = ((ObjectPType) psource.Type).ClrType;
if (typeof (IEnumerable<PValue>).IsAssignableFrom(clrType))
goto case PType.BuiltIn.List;
else if (typeof (IEnumerable).IsAssignableFrom(clrType))
return _wrapNonGenericIEnumerable(sctx, (IEnumerable) psource.Value);
break;
}
IEnumerable<PValue> set;
IEnumerable nset;
if (psource.TryConvertTo(sctx, true, out set))
return set;
else if (psource.TryConvertTo(sctx, true, out nset))
return _wrapNonGenericIEnumerable(sctx, nset);
else
return _wrapDynamicIEnumerable(sctx, psource);
}
private static EntityRef _getMacroRef(StackContext sctx, PValue rawMacro)
{
PFunction func;
MacroCommand mcmd;
if (rawMacro.TryConvertTo(sctx, out func))
return EntityRef.Function.Create(func.Id, func.ParentApplication.Module.Name);
else if (rawMacro.TryConvertTo(sctx, out mcmd))
return EntityRef.MacroCommand.Create(mcmd.Id);
else
return rawMacro.ConvertTo<EntityRef>(sctx);
}
private static bool _tryConvertToBool(StackContext sctx, PValue operand, out bool value)
{
value = false;
switch (operand.Type.ToBuiltIn())
{
case BuiltIn.Real:
case BuiltIn.Int:
case BuiltIn.Bool:
value = (bool) operand.Value;
return true;
case BuiltIn.String:
if (!bool.TryParse(operand.Value as string, out value))
{
value = false;
return true;
}
break;
case BuiltIn.Object:
PValue asBool;
if (operand.TryConvertTo(sctx, Bool, out asBool))
{
value = (bool) asBool.Value;
return true;
}
break;
case BuiltIn.Null:
value = false;
return true;
}
return false;
}
public static PValue RunStatically(PValue arg0, PValue arg1, StackContext sctx)
{
var x = (double) arg0.ConvertTo(sctx, PType.Real, true).Value;
int d;
PValue pd;
if (arg1 != null && arg1.TryConvertTo(sctx, PType.Int, true, out pd))
d = System.Math.Abs((int) pd.Value);
else
d = 0;
return System.Math.Round(x, d, MidpointRounding.AwayFromZero);
}
