public static void Release(TempValString temp)
{
lock (lockObj) {
temp.next = _tempPoolHead;
_tempPoolHead = temp;
}
}
/// <summary>
/// Look up the given identifier as quickly as possible, without
/// walking the __isa chain or doing anything fancy. (This is used
/// when looking up local variables.)
/// </summary>
/// <param name="identifier">identifier to look up</param>
/// <returns>true if found, false if not</returns>
public bool TryGetValue(string identifier, out Value value)
{
var idVal = TempValString.Get(identifier);
bool result = map.TryGetValue(idVal, out value);
TempValString.Release(idVal);
return(result);
}
/// <summary>
/// Convenience method to check whether the map contains a given string key.
/// </summary>
/// <param name="identifier">string key to check for</param>
/// <returns>true if the map contains that key; false otherwise</returns>
public bool ContainsKey(string identifier)
{
var idVal = TempValString.Get(identifier);
bool result = map.ContainsKey(idVal);
TempValString.Release(idVal);
return(result);
}
/// <summary>
/// Accessor to get/set on element of this map by a string key, walking
/// the __isa chain as needed. (Note that if you want to avoid that, then
/// simply look up your value in .map directly.)
/// </summary>
/// <param name="identifier">string key to get/set</param>
/// <returns>value associated with that key</returns>
public Value this [string identifier] {
get {
var idVal = TempValString.Get(identifier);
Value result = Lookup(idVal);
TempValString.Release(idVal);
return(result);
}
set { map[new ValString(identifier)] = value; }
}
public static TempValString Get(string s)
{
lock (lockObj) {
if (_tempPoolHead == null)
{
return(new TempValString(s));
}
else
{
var result = _tempPoolHead;
_tempPoolHead = _tempPoolHead.next;
result.value = s;
return(result);
}
}
}
private TempValString(string s) : base(s)
{
this.next = 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, 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);
}
