private void EnqueOperation(ExpressionOperation operation)
{
while (operatorStack.Count > 0 && operation.Precedence <= operatorStack.Peek().Precedence)
{
outputQueue.Enqueue(operatorStack.Pop());
}
operatorStack.Push(operation);
}
public override void EndNode(ParserContext context)
{
switch (context.NodeKind)
{
case SyntaxNodeKind.Expression:
while (operatorStack.Count > 0)
{
var op = operatorStack.Pop();
if (op.Kind == ExpressionOperationKind.Expression)
break;
outputQueue.Enqueue(op);
}
break;
case SyntaxNodeKind.UnaryOperator:
var unaryOp = new ExpressionOperation(ConvertUnaryToOperationKind(context.Span));
EnqueOperation(unaryOp);
break;
case SyntaxNodeKind.Operator:
var op1 = new ExpressionOperation(ConvertToOperationKind(context.Span));
EnqueOperation(op1);
break;
case SyntaxNodeKind.Constant:
outputQueue.Enqueue(
new ExpressionOperation(ExpressionOperationKind.Number, ToNumber(context.Span.Text)));
break;
case SyntaxNodeKind.ExpressionIdentifier:
Label label;
var labelName = context.Span.Text;
var found = labelStore.TryGetLabel(labelName, out label);
var topOperatorKind = operatorStack.Peek().Kind;
switch (topOperatorKind)
{
case ExpressionOperationKind.Def:
labelStore.AddReferencedLabel(labelName, lineNumber);
operatorStack.Pop();
outputQueue.Enqueue(new ExpressionOperation(ExpressionOperationKind.Number, found ? 1 : 0));
break;
case ExpressionOperationKind.Ref:
operatorStack.Pop();
ISet<int> referencingLines;
bool anyReference = labelStore.TryGetReferencingLines(labelName, out referencingLines);
int refOperatorResult = (anyReference &&
(referencingLines.Count != 1 || !referencingLines.Contains(lineNumber)))
? 1
: 0;
outputQueue.Enqueue(new ExpressionOperation(ExpressionOperationKind.Number, refOperatorResult));
break;
default:
labelStore.AddReferencedLabel(labelName, lineNumber);
outputQueue.Enqueue(
found
? new ExpressionOperation(ExpressionOperationKind.Number, label.Value)
: new ExpressionOperation(ExpressionOperationKind.Number, 0));
break;
}
break;
}
}
