public ParserContext(ParserContext context, bool copyNames = false)
: this(context.Nodes)
{
if (copyNames)
{
NameStack.AddRange(context.NameStack);
}
}
protected IEnumerable <EnclosingNode <T> > GetEnclosingNodes <T> (Func <T, bool> selector = null, Func <JSNode, bool> halter = null)
where T : JSNode
{
JSNode previous = null;
string previousName = null;
// F**k the C# compiler and its busted enumerator transform
// https://connect.microsoft.com/VisualStudio/feedback/details/781746/c-compiler-produces-incorrect-code-for-use-of-enumerator-structs-inside-enumerator-functions
using (var eNodes = (IEnumerator <JSNode>)Stack.GetEnumerator())
using (var eNames = (IEnumerator <string>)NameStack.GetEnumerator())
while (eNodes.MoveNext() && eNames.MoveNext())
{
iterationStart:
var value = eNodes.Current as T;
var name = eNames.Current;
if (value == null)
{
previous = eNodes.Current;
previousName = name;
continue;
}
if ((selector == null) || selector(value))
{
yield return(new EnclosingNode <T> {
Node = value,
Child = previous,
ChildName = previousName
});
}
if ((halter != null) && halter(value))
{
yield break;
}
previous = eNodes.Current;
previousName = name;
}
}
public void VisitNode(JSVariable v)
{
if (CurrentName == "FunctionSignature")
{
// In argument list
return;
}
var parentBoe = ParentNode as JSBinaryOperatorExpression;
var parentDot = ParentNode as JSDotExpressionBase;
var parentInvocation = ParentNode as JSDelegateInvocationExpression;
var parentAccess = ParentNode as JSDotExpressionBase;
var escapeContext = Stack.FirstOrDefault(
n =>
n is JSReturnExpression ||
n is JSThrowExpression ||
n is JSOperatorExpressionBase ||
n is JSInvocationExpressionBase ||
n is JSNewExpression
);
var escapeBoe = escapeContext as JSBinaryOperatorExpression;
var isWriteTarget = (
(escapeBoe != null) &&
(escapeBoe.Operator is JSAssignmentOperator) &&
NameStack.FirstOrDefault(
n => (n == "Left") || (n == "Right")
) == "Left"
);
var isWriteSource = (
(escapeBoe != null) &&
(escapeBoe.Operator is JSAssignmentOperator) &&
NameStack.FirstOrDefault(
n => (n == "Left") || (n == "Right")
) == "Right"
);
var isReturned = escapeContext is JSReturnExpression;
var isThrown = escapeContext is JSThrowExpression;
var isArgument = escapeContext is JSInvocationExpressionBase ||
escapeContext is JSNewExpression;
var flags = SlotFlags.None;
if (
(parentBoe != null) &&
(parentBoe.Operator is JSAssignmentOperator) &&
(CurrentName == "Left")
)
{
flags |= SlotFlags.Assignment;
}
else if (
(parentDot != null) &&
(CurrentName == "Target")
)
{
flags |= isWriteTarget
? SlotFlags.Write | SlotFlags.Through
: SlotFlags.Read | SlotFlags.Through;
}
else if (
(parentInvocation != null) &&
(CurrentName == "Delegate")
)
{
flags |= SlotFlags.Invoke;
}
else
{
flags |= SlotFlags.Read;
}
if (isWriteSource || isReturned || isThrown || isArgument)
{
if (parentAccess == null)
{
flags |= SlotFlags.Escapes;
}
}
if (flags != SlotFlags.None)
{
CreateBarrier(new SlotDictionary {
{ v, flags }
});
}
VisitChildren(v);
}