ISemantic E(EqualExpression x, ISemantic lValue = null, ISemantic rValue = null)
{
var l = TryGetValue(lValue ?? E(x.LeftOperand));
var r = TryGetValue(rValue ?? E(x.RightOperand));
var isEq = SymbolValueComparer.IsEqual(l, r);
return(new PrimitiveValue(x.OperatorToken == DTokens.Equal ? isEq : !isEq, x));
}
public override void Set(AbstractSymbolValueProvider vp, ISymbolValue value)
{
var oldV = vp[Variable];
if (oldV is AssociativeArrayValue)
{
if (Key != null)
{
var aa = (AssociativeArrayValue)oldV;
int itemToReplace = -1;
for (int i = 0; i < aa.Elements.Count; i++)
{
if (SymbolValueComparer.IsEqual(aa.Elements[i].Key, Key))
{
itemToReplace = i;
break;
}
}
// If we haven't found a matching key, add it to the array
var newElements = new KeyValuePair <ISymbolValue, ISymbolValue> [aa.Elements.Count + (itemToReplace == -1 ? 1: 0)];
aa.Elements.CopyTo(newElements, 0);
if (itemToReplace != -1)
{
newElements[itemToReplace] = new KeyValuePair <ISymbolValue, ISymbolValue>(newElements[itemToReplace].Key, value);
}
else
{
newElements[newElements.Length - 1] = new KeyValuePair <ISymbolValue, ISymbolValue>(Key, value);
}
// Finally, make a new associative array containing the new elements
vp[Variable] = new AssociativeArrayValue(aa.RepresentedType as AssocArrayType, newElements);
}
else
{
if (vp.ev != null)
{
vp.ev.EvalError(null, "Key expression must not be null", Key);
}
}
}
else
{
if (vp.ev != null)
{
vp.ev.EvalError(null, "Type of accessed item must be an associative array", oldV);
}
}
}
public virtual bool Equals(ISymbolValue other)
{
return(SymbolValueComparer.IsEqual(this, other));
}