/// <summary>
/// Look up the given identifier in the given sequence, walking the type chain
/// until we either find it, or fail.
/// </summary>
/// <param name="sequence">Sequence (object) to look in.</param>
/// <param name="identifier">Identifier to look for.</param>
/// <param name="context">Context.</param>
public static Value Resolve(Value sequence, string identifier, TAC.Context context, out ValMap valueFoundIn)
{
var includeMapType = true;
valueFoundIn = null;
int loopsLeft = 1000; // (max __isa chain depth)
while (sequence != null)
{
if (sequence is ValTemp || sequence is ValVar)
{
sequence = sequence.Val(context);
}
if (sequence is ValMap)
{
// If the map contains this identifier, return its value.
Value result = null;
var idVal = TempValString.Get(identifier);
bool found = ((ValMap)sequence).map.TryGetValue(idVal, out result);
TempValString.Release(idVal);
if (found)
{
valueFoundIn = (ValMap)sequence;
return(result);
}
// Otherwise, if we have an __isa, try that next.
if (loopsLeft < 0)
{
return(null); // (unless we've hit the loop limit)
}
if (!((ValMap)sequence).map.TryGetValue(ValString.magicIsA, out sequence))
{
// ...and if we don't have an __isa, try the generic map type if allowed
if (!includeMapType)
{
throw new KeyException(identifier);
}
sequence = context.vm.mapType ?? Intrinsics.MapType();
includeMapType = false;
}
}
else if (sequence is ValList)
{
sequence = context.vm.listType ?? Intrinsics.ListType();
includeMapType = false;
}
else if (sequence is ValString)
{
sequence = context.vm.stringType ?? Intrinsics.StringType();
includeMapType = false;
}
else if (sequence is ValNumber)
{
sequence = context.vm.numberType ?? Intrinsics.NumberType();
includeMapType = false;
}
else if (sequence is ValFunction)
{
sequence = context.vm.functionType ?? Intrinsics.FunctionType();
includeMapType = false;
}
else
{
throw new TypeException("Type Error (while attempting to look up " + identifier + ")");
}
loopsLeft--;
}
return(null);
}
/// <summary>
/// Look up the given identifier in the given sequence, walking the type chain
/// until we either find it, or fail.
/// </summary>
/// <param name="sequence">Sequence (object) to look in.</param>
/// <param name="identifier">Identifier to look for.</param>
/// <param name="context">Context.</param>
public static Value Resolve(Value sequence, string identifier, Context context, out ValMap valueFoundIn)
{
var includeMapType = true;
valueFoundIn = null;
int loopsLeft = 1000; // (max __isa chain depth)
while (sequence != null)
{
int seqTypeInt = sequence.GetBaseMiniscriptType();
//if (sequence is ValTemp || sequence is ValVar)
if (seqTypeInt == MiniscriptTypeInts.ValTempTypeInt || seqTypeInt == MiniscriptTypeInts.ValVarTypeInt)
{
sequence = sequence.Val(context, false);
seqTypeInt = sequence == null ? -1 : sequence.GetBaseMiniscriptType();
}
//if (sequence is ValMap) {
if (seqTypeInt == MiniscriptTypeInts.ValMapTypeInt)
{
// If the map contains this identifier, return its value.
ValMap seqMap = sequence as ValMap;
Value result = null;
var idVal = ValString.Create(identifier);
bool found = seqMap.TryGetValue(idVal, out result);
idVal.Unref();
if (found)
{
valueFoundIn = seqMap;
return(result);
}
// Otherwise, if we have an __isa, try that next.
if (loopsLeft < 0)
{
return(null); // (unless we've hit the loop limit)
}
if (!seqMap.TryGetValue(ValString.magicIsA, out sequence))
{
// ...and if we don't have an __isa, try the generic map type if allowed
if (!includeMapType)
{
throw new KeyException(identifier);
}
sequence = context.vm.mapType ?? Intrinsics.MapType();
includeMapType = false;
}
//} else if (sequence is ValList) {
}
else if (seqTypeInt == MiniscriptTypeInts.ValListTypeInt)
{
sequence = context.vm.listType ?? Intrinsics.ListType();
includeMapType = false;
//} else if (sequence is ValString) {
}
else if (seqTypeInt == MiniscriptTypeInts.ValStringTypeInt)
{
sequence = context.vm.stringType ?? Intrinsics.StringType();
includeMapType = false;
//} else if (sequence is ValNumber) {
}
else if (seqTypeInt == MiniscriptTypeInts.ValNumberTypeInt)
{
sequence = context.vm.numberType ?? Intrinsics.NumberType();
includeMapType = false;
//} else if (sequence is ValFunction) {
}
else if (seqTypeInt == MiniscriptTypeInts.ValFunctionTypeInt)
{
sequence = context.vm.functionType ?? Intrinsics.FunctionType();
includeMapType = false;
}
else if (seqTypeInt == MiniscriptTypeInts.ValCustomTypeInt)
{
ValCustom custom = sequence as ValCustom;
if (custom.Resolve(identifier, out Value result))
{
//valueFoundIn
return(result);
}
return(null);
}
else
{
throw new TypeException("Type Error (while attempting to look up " + identifier + ")");
}
loopsLeft--;
}
return(null);
}