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Visitor.cs
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Visitor.cs
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using System;
using System.Linq.Expressions;
namespace ExpressionVisitor
{
public abstract class Visitor
{
private readonly Expression node;
protected Visitor(Expression node)
{
this.node = node;
}
public abstract void Visit(string prefix);
public ExpressionType NodeType => this.node.NodeType;
public static Visitor CreateFromExpression(Expression node)
{
switch (node.NodeType)
{
case ExpressionType.Constant:
return new ConstantVisitor((ConstantExpression)node);
case ExpressionType.Lambda:
return new LambdaVisitor((LambdaExpression)node);
case ExpressionType.Parameter:
return new ParameterVisitor((ParameterExpression)node);
// Lots of Binary Expression Types:
case ExpressionType.Add:
case ExpressionType.Equal:
case ExpressionType.Multiply:
case ExpressionType.GreaterThan:
case ExpressionType.Assign:
return new BinaryVisitor((BinaryExpression)node);
case ExpressionType.Conditional:
return new ConditionalVisitor((ConditionalExpression)node);
case ExpressionType.Call:
return new MethodCallVisitor((MethodCallExpression)node);
case ExpressionType.Block:
return new BlockVisitor((BlockExpression)node);
case ExpressionType.Loop:
return new LoopVisitor((LoopExpression)node);
case ExpressionType.PostDecrementAssign:
return new UnaryVisitor((UnaryExpression)node);
case ExpressionType.Goto:
return new GoToVisitor((GotoExpression)node);
default:
Console.Error.WriteLine($"Node not processed yet: {node.NodeType}");
return default(Visitor);
}
}
}
}