public double CastDouble(double encoded)
{
var type = NanTags.TypeOf(encoded);
double result;
switch (type)
{
case DataType.Number:
return(encoded);
case DataType.ValInt32:
return(NanTags.DecodeInt32(encoded));
case DataType.ValUInt32:
return(NanTags.DecodeUInt32(encoded));
case DataType.VariableRef:
// Follow scope
var next = Variables.Resolve(NanTags.DecodeVariableRef(encoded));
return(CastDouble(next));
case DataType.ValSmallString:
double.TryParse(NanTags.DecodeShortStr(encoded), out result);
return(result);
case DataType.PtrStaticString:
case DataType.PtrString:
NanTags.DecodePointer(encoded, out var target, out _);
double.TryParse(DereferenceString(target), out result);
return(result);
// All the things that can't be meaningfully cast
default: return(0.0d);
}
}
private string Stringify(double token, DataType type, HashLookup <string> debugSymbols)
{
switch (type)
{
case DataType.Invalid: return("");
case DataType.NoValue: return("");
case DataType.VariableRef:
var rref = NanTags.DecodeVariableRef(token);
if (debugSymbols?.ContainsKey(rref) == true)
{
return("'" + debugSymbols[rref] + "' (" + rref.ToString("X") + ")");
}
return(rref.ToString("X"));
case DataType.Opcode:
NanTags.DecodeLongOpCode(token, out var ccls, out var cact, out var refr);
if (ccls == 'm')
{
if (debugSymbols?.ContainsKey(refr) == true)
{
return(ccls + "" + cact + " '" + debugSymbols[refr] + "' (" + refr.ToString("X") + ")");
}
}
if (ccls == 'i')
{
if (debugSymbols?.ContainsKey(refr) == true)
{
return("Incr " + ((sbyte)cact) + " '" + debugSymbols[refr] + "' (" + refr.ToString("X") + ")");
}
}
NanTags.DecodeOpCode(token, out _, out _, out var p1, out var p2);
return(ccls + "" + cact + " (" + p1 + ", " + p2 + ")");
case DataType.ValSmallString:
return("[" + NanTags.DecodeShortStr(token) + "]");
case DataType.PtrHashtable:
case DataType.PtrGrid:
case DataType.PtrSet:
case DataType.PtrVector:
case DataType.PtrString:
case DataType.PtrStaticString:
NanTags.DecodePointer(token, out var targ, out _);
return(" -> " + targ);
case DataType.ValInt32: return(NanTags.DecodeInt32(token).ToString());
case DataType.ValUInt32: return(NanTags.DecodeUInt32(token).ToString());
case DataType.Number: return(token.ToString(CultureInfo.InvariantCulture));
default:
throw new ArgumentOutOfRangeException(nameof(type), type, null);
}
}
public void int32_overflows_the_same_way_as_native()
{
unchecked {
for (int i = 1; i > 0; i += i)
{
int original = i * 2;
double enc = NanTags.EncodeInt32(original);
int result = NanTags.DecodeInt32(enc);
Assert.That(result, Is.EqualTo(original));
}
}
}
public int CastInt(double encoded)
{
int result;
var type = NanTags.TypeOf(encoded);
switch (type)
{
case DataType.Invalid:
case DataType.Opcode:
case DataType.NoValue:
return(0);
case DataType.VariableRef:
// Follow scope
var next = Variables.Resolve(NanTags.DecodeVariableRef(encoded));
return(CastInt(next));
case DataType.ValSmallString:
int.TryParse(NanTags.DecodeShortStr(encoded), out result);
return(result);
case DataType.PtrStaticString:
case DataType.PtrString:
NanTags.DecodePointer(encoded, out var target, out _);
int.TryParse(DereferenceString(target), out result);
return(result);
case DataType.PtrHashtable:
case DataType.PtrGrid:
case DataType.PtrSet:
case DataType.PtrVector:
return(0);
case DataType.Number: return((int)encoded);
case DataType.ValInt32: return(NanTags.DecodeInt32(encoded));
case DataType.ValUInt32: return((int)NanTags.DecodeUInt32(encoded));
default:
throw new ArgumentOutOfRangeException();
}
}
public string CastString(double encoded)
{
var type = NanTags.TypeOf(encoded);
switch (type)
{
case DataType.Invalid: return("<invalid value>");
case DataType.Number: return(encoded.ToString(CultureInfo.InvariantCulture));
case DataType.Opcode: return("<Op Code>");
case DataType.NoValue: return("");
case DataType.VariableRef:
// Follow scope
var next = Variables.Resolve(NanTags.DecodeVariableRef(encoded));
return(CastString(next));
case DataType.ValSmallString:
return(NanTags.DecodeShortStr(encoded));
case DataType.PtrStaticString:
case DataType.PtrString:
NanTags.DecodePointer(encoded, out var target, out _);
return(DereferenceString(target));
case DataType.PtrHashtable:
case DataType.PtrGrid:
case DataType.PtrSet:
case DataType.PtrVector:
return("<complex type>");
case DataType.ValInt32: return(NanTags.DecodeInt32(encoded).ToString());
case DataType.ValUInt32: return(NanTags.DecodeUInt32(encoded).ToString());
default:
throw new ArgumentOutOfRangeException();
}
}
public bool CastBoolean(double encoded)
{
var type = NanTags.TypeOf(encoded);
switch (type)
{
case DataType.Number:
return(Math.Abs(encoded) > double.Epsilon);
case DataType.ValInt32:
return(NanTags.DecodeInt32(encoded) != 0);
case DataType.ValUInt32:
return(NanTags.DecodeUInt32(encoded) != 0);
case DataType.ValSmallString:
{
var strVal = NanTags.DecodeShortStr(encoded);
return(StringTruthyness(strVal));
}
case DataType.PtrString:
case DataType.PtrStaticString:
{
NanTags.DecodePointer(encoded, out var ptr, out _);
var strVal = DereferenceString(ptr);
return(StringTruthyness(strVal));
}
case DataType.VariableRef:
// Follow scope
var next = Variables.Resolve(NanTags.DecodeVariableRef(encoded));
return(CastBoolean(next));
// All the things that can't be meaningfully cast are 'false'
default: return(false);
}
}