create own simple programming language in csharp

To create a simple programming language in C#, we need to write an interpreter that can execute programs written in our language. To do this, we need to create a parser and a lexer to read and interpret the source code.

Here are the basic steps to create a simple programming language in C#:

Define the syntax of your programming language using backus-naur form (BNF).
Create a lexer to tokenize the input source code.
Create a parser to analyze the tokens and generate an abstract syntax tree (AST).
Write an interpreter to execute the AST.

Here's some sample C# code to get you started with creating a lexer:


main.cs
public class Token
{
    public TokenType Type { get; set; }
    public string Value { get; set; }
}

public enum TokenType
{
    Integer,
    Plus,
    Minus,
    Multiply,
    Divide,
    LParen,
    RParen
}

public class Lexer
{
    private readonly string _input;
    private int _position;

    public Lexer(string input)
    {
        _input = input;
        _position = 0;
    }

    public Token NextToken()
    {
        if (_position >= _input.Length)
        {
            return null;
        }

        var currentChar = _input[_position];

        if (char.IsDigit(currentChar))
        {
            return new Token
            {
                Type = TokenType.Integer,
                Value = ReadInteger()
            };
        }

        if (currentChar == '+')
        {
            _position++;
            return new Token { Type = TokenType.Plus };
        }

        // Handle other token types here...

        throw new InvalidOperationException($"Unrecognized character: {currentChar}");
    }

    private string ReadInteger()
    {
        var sb = new StringBuilder();

        while (_position < _input.Length && char.IsDigit(_input[_position]))
        {
            sb.Append(_input[_position]);
            _position++;
        }

        return sb.ToString();
    }
}
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This code defines a Token class to hold information about each token in the input source code, and a TokenType enumeration to represent the different types of tokens. The Lexer class reads each character in the input source code and generates tokens based on the recognized patterns.

Once you have a working lexer, you can move on to creating a parser and interpreter to execute the source code.

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