public SymPreProcessorWorkerEndif(SymParserWorkerContext aContext)
: base(aContext)
{
// When the endif token is reached, we must work back up the tree
// looking for the previous (i.e. most recent) conditional expression
// node.
SymNodeConditionalExpression condExpNode = SymParserWorkerConditionalExpression.FindMostRecentConditionalExpression(aContext.Document.CurrentNode);
if (condExpNode == null)
{
throw new Exception("Unable to locate most recent condition expression during ENDIF handling");
}
// There must always be a positive condition node and some kind of condition
if (condExpNode.ChildTypeExists(typeof(SymNodeCondition)) == false)
{
throw new Exception("No child condition node found during ENDIF handling");
}
// We change the current node to be the parent of the conditional expression.
// Any new tokens will appear as siblings
aContext.Document.CurrentNode = condExpNode.Parent;
// Make sure we tell the parser that it can pop off this conditional expression node.
SymPreProcessorParser parser = (SymPreProcessorParser)aContext.Parser;
SymNodeConditionalExpression poppedExpression = parser.ConditionalExpressionPop();
System.Diagnostics.Debug.Assert(poppedExpression == condExpNode);
// Job done - dequeue
RemoveSelf();
}
public SymPreProcessorWorkerElseIf(SymParserWorkerContext aContext)
: base(aContext)
{
// When the else token is reached, we must work back up the tree
// looking for the previous (i.e. most recent) conditional expression
// node.
SymNodeConditionalExpression condExpNode = SymParserWorkerConditionalExpression.FindMostRecentConditionalExpression(aContext.Document.CurrentNode);
if (condExpNode == null)
{
throw new Exception("Unable to locate most recent condition expression during ELSE IF handling");
}
// There must always be a positive condition node and some kind of condition
if (condExpNode.ChildTypeExists(typeof(SymNodeCondition)) == false)
{
throw new Exception("No child condition node found during ELSE IF handling");
}
// Make the conditional expression the current node
aContext.Document.CurrentNode = condExpNode;
// Make a new condition worker. The condition worker creates a new condition node
// which becomes the new current node.
SymParserWorkerContext context = new SymParserWorkerContext(aContext.Document.Context, this);
SymParserWorkerCondition conditionWorker = new SymParserWorkerCondition(context, new SymNodePreProcessorCondition(aContext.CurrentToken.Value));
AddChild(conditionWorker);
}
public void MakeConditionalArgumentCurrent(SymParserDocument aDocument)
{
SymNodeConditionalExpression condExpNode = SymParserWorkerConditionalExpression.FindMostRecentConditionalExpression(this);
if (condExpNode == null)
{
throw new Exception("Unable to locate conditional expression. Document is corrupt");
}
aDocument.CurrentNode = condExpNode;
}