public void Traverse(IAstNode astNode)
{
ProcessNode?.Invoke(astNode);
switch (astNode.AstNodeType)
{
case AstNodeTypes.VarStatement:
Traverse(astNode.AsVarStatement().Expression);
break;
case AstNodeTypes.PrintStatement:
foreach (var printExpr in astNode.AsPrintStatement().PrintExpressions)
{
Traverse(printExpr);
}
break;
case AstNodeTypes.PrintExpression:
Traverse(astNode.AsPrintExpression().Expression);
break;
case AstNodeTypes.UnaryOperator:
Traverse(astNode.AsUnaryOp().Operand);
break;
case AstNodeTypes.BinaryOperator:
Traverse(astNode.AsBinaryOp().LeftOperand);
Traverse(astNode.AsBinaryOp().RightOperand);
break;
case AstNodeTypes.NumberLiteral:
break;
case AstNodeTypes.StringLiteral:
break;
case AstNodeTypes.VarReference:
break;
}
PostProcessNode?.Invoke(astNode.AstNodeType);
}
/// <summary>
/// Raises the <see cref="E:PostProcessNode" /> event.
/// </summary>
/// <param name="e">The <see cref="PostProcessNodeEventArgs"/> instance containing the event data.</param>
protected virtual void OnPostProcessNode(PostProcessNodeEventArgs e)
{
PostProcessNode?.Invoke(this, e);
}
public void Traverse(IAstNode astNode)
{
ProcessNode?.Invoke(astNode);
_tracer.BeginTrace(astNode.AstNodeType.ToString());
switch (astNode.AstNodeType)
{
case AstNodeType.Syntax:
if (astNode.AsSyntax().PreActionNode != null)
{
Traverse(astNode.AsSyntax().PreActionNode);
}
foreach (var stmt in astNode.AsSyntax().Statements)
{
Traverse(stmt);
}
if (astNode.AsSyntax().PostActionNode != null)
{
Traverse(astNode.AsSyntax().PostActionNode);
}
break;
case AstNodeType.Statement:
if (astNode.AsStatement().PreActionNode != null)
{
Traverse(astNode.AsStatement().PreActionNode);
}
CheckForValue(astNode, "Expression", astNode.AsStatement().Expression);
Traverse(astNode.AsStatement().Expression);
if (astNode.AsStatement().PostActionNode != null)
{
Traverse(astNode.AsStatement().PostActionNode);
}
break;
case AstNodeType.Expression:
if (astNode.AsExpression().PreActionNode != null)
{
Traverse(astNode.AsExpression().PreActionNode);
}
foreach (var term in astNode.AsExpression().Terms)
{
Traverse(term);
}
if (astNode.AsExpression().PostActionNode != null)
{
Traverse(astNode.AsExpression().PreActionNode);
}
break;
case AstNodeType.Term:
if (astNode.AsTerm().PreActionNode != null)
{
Traverse(astNode.AsTerm().PreActionNode);
}
foreach (var factor in astNode.AsTerm().Factors)
{
Traverse(factor);
}
if (astNode.AsTerm().PostActionNode != null)
{
Traverse(astNode.AsTerm().PreActionNode);
}
break;
case AstNodeType.Factor:
if (astNode.AsFactor().PreActionNode != null)
{
Traverse(astNode.AsFactor().PreActionNode);
}
CheckForValue(astNode, "FactorExpr", astNode.AsFactor().FactorExpr);
Traverse(astNode.AsFactor().FactorExpr);
if (astNode.AsFactor().PostActionNode != null)
{
Traverse(astNode.AsFactor().PostActionNode);
}
break;
case AstNodeType.ProdRef:
_tracer.TraceLine($"{astNode.AsProdRef().ProdName}");
break;
case AstNodeType.Terminal:
_tracer.TraceLine($"{astNode.AsTerminal().TermName}");
break;
case AstNodeType.Action:
_tracer.TraceLine($"{astNode.AsAction().ActionName}");
break;
case AstNodeType.Paren:
CheckForValue(astNode, "Expression", astNode.AsParen().Expression);
Traverse(astNode.AsParen().Expression);
break;
case AstNodeType.Option:
CheckForValue(astNode, "Expression", astNode.AsOption().Expression);
Traverse(astNode.AsOption().Expression);
break;
case AstNodeType.KleeneStar:
CheckForValue(astNode, "Expression", astNode.AsKleene().Expression);
Traverse(astNode.AsKleene().Expression);
break;
}
_tracer.EndTrace(astNode.AstNodeType.ToString());
PostProcessNode?.Invoke();
}
