public virtual object VisitYieldStatement(YieldStatement yieldStatement, object data)
{
stackMap.Push(yieldStatement);
if (yieldStatement.ReturnValue != null)
{
yieldStatement.ReturnValue.AcceptVisitor(this, data);
}
stackMap.Pop();
return(null);
}
private YieldStatement ParseYieldStatement()
{
YieldStatement node = null;
if (isAnonynous > 0)
{
ReportError("yield not be authorized in anonymous method.");
}
if (curIterator != null)
{
//double check ...
if (!curIterator.CouldBeIterator)
{
ReportError("yield is permitted only in iterator's body.");
}
else
{
curIterator.IsIterator = true;
}
}
else
{
ReportError("yield is permitted only in iterator's body.");
}
AssertAndAdvance(TokenID.Yield);
switch (curtok.ID)
{
case TokenID.Return:
node = new YieldStatement(false, true, curtok);
Advance();
node.ReturnValue = ParseExpression();
break;
case TokenID.Break:
node = new YieldStatement(true, false, curtok);
Advance();
break;
default:
//TODO: Wait, but 'node' will still be null!
ReportError("Expected return or break. Found '" + curtok.ID.ToString().ToLower() + "'.");
Advance();
break;
}
//try .. catch .. finally checks
if (isTry>0
&& node.IsReturn )
{
hasYieldReturnInTry = true;
}
if(isCatch>0)
{
ReportError("'yield return' and 'yield break' are not permitted in catch block.");
if (hasYieldReturnInTry)
{
ReportError("'yield return' is not permitted in try block with catch block.");
}
}
if(isFinally>0)
{
ReportError("'yield return' and 'yield break' are not permitted in finally block.");
}
AssertAndAdvance(TokenID.Semi);
return node;
}
public virtual object VisitYieldStatement(YieldStatement yieldStatement, object data)
{
stackMap.Push(yieldStatement);
if (yieldStatement.ReturnValue != null)
{
yieldStatement.ReturnValue.AcceptVisitor(this, data);
}
stackMap.Pop();
return null;
}