QilScopedVisitor.cs

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namespace System.Xml.Xsl.Qil;
 
internal class QilScopedVisitor : QilVisitor
{
    protected virtual void BeginScope(QilNode node)
    {
    }
 
    protected virtual void EndScope(QilNode node)
    {
    }
 
    protected virtual void BeforeVisit(QilNode node)
    {
        switch (node.NodeType)
        {
        case QilNodeType.QilExpression:
        {
            QilExpression qilExpression = (QilExpression)node;
            foreach (QilNode globalParameter in qilExpression.GlobalParameterList)
            {
                BeginScope(globalParameter);
            }
            foreach (QilNode globalVariable in qilExpression.GlobalVariableList)
            {
                BeginScope(globalVariable);
            }
            {
                foreach (QilNode function in qilExpression.FunctionList)
                {
                    BeginScope(function);
                }
                break;
            }
        }
        case QilNodeType.Function:
        {
            foreach (QilNode argument in ((QilFunction)node).Arguments)
            {
                BeginScope(argument);
            }
            break;
        }
        case QilNodeType.Loop:
        case QilNodeType.Filter:
        case QilNodeType.Sort:
            BeginScope(((QilLoop)node).Variable);
            break;
        }
    }
 
    protected virtual void AfterVisit(QilNode node)
    {
        switch (node.NodeType)
        {
        case QilNodeType.QilExpression:
        {
            QilExpression qilExpression = (QilExpression)node;
            foreach (QilNode function in qilExpression.FunctionList)
            {
                EndScope(function);
            }
            foreach (QilNode globalVariable in qilExpression.GlobalVariableList)
            {
                EndScope(globalVariable);
            }
            {
                foreach (QilNode globalParameter in qilExpression.GlobalParameterList)
                {
                    EndScope(globalParameter);
                }
                break;
            }
        }
        case QilNodeType.Function:
        {
            foreach (QilNode argument in ((QilFunction)node).Arguments)
            {
                EndScope(argument);
            }
            break;
        }
        case QilNodeType.Loop:
        case QilNodeType.Filter:
        case QilNodeType.Sort:
            EndScope(((QilLoop)node).Variable);
            break;
        }
    }
 
    protected override QilNode Visit(QilNode n)
    {
        BeforeVisit(n);
        QilNode result = base.Visit(n);
        AfterVisit(n);
        return result;
    }
}