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7.1

Converting a prefix expression to an expression/syntax tree

Asked by hagur in Parsers, C# Programming Language

Tags: C#

Hi,

I'm experimenting with prefix notation, I need to convert it to an abstract syntax tree or expression tree as it's also called.

I've created a data structure for the tree, which are two classes and I've attached them both as code snippets.

An example of a prefix expression I need to read into my tree structure is: + * A B / C D

I don't seem to be able to figure out how to do this properly ... a solution or a pointer in the right direction would be much appreciated :-)

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             ASTree class:
 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using InfixPostfixPrefix.Converters;
 
namespace InfixPostfixPrefix
{
    public enum TokenCodes
    {
        INTEGER = 0,
        ADD_OPERATOR = 1,
        SUBTRACT_OPERATOR = 2,
        MULTIPLY_OPERATOR = 3
    }
 
    public class ASTree
    {
        public ASTreeNode RootNode { get; set; }
 
        public ASTree()
        {
            RootNode = new ASTreeNode();
        }
    }
}
 
ASTreeNode class:
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace InfixPostfixPrefix
{
    public class ASTreeNode
    {
        public string Root { get; set; }
        public TokenCodes TokenCode { get; set; }
        public ASTreeNode RightNode { get; set; }
        public ASTreeNode LeftNode { get; set; }
 
        public bool IsLeaf
        {
            get { return (RightNode == null && LeftNode == null); }
        }
    }
}
           
         

	Title
1	BATCH FILE
2	Batch File
3	Rename Batch Script for inserting into …

Converting a prefix expression to an expression/syntax tree

Asked by hagur in Parsers, C# Programming Language

Tags: C#

About this solution