SharpEval

SharpEval is a library that allows you to parse & evaluate math expressions at runtime

Features

• Parses and evaluates expressions extremely fast
• Supports custom variables and functions
• Compatible with Unity 3.4.0 and newer
• Supports Unity IL2CPP
• No reflection
• No external dependencies

Usage

Parse & evaluate an expression:

using SharpEval;
using SharpEval.Tokens;
using SharpEval.Expressions;

internal static class Program
{
  internal static void Main()
  {
    Token[] tokens = new Tokenizer(" ( ( ( 2 + 2 ) ^ 2 + 16 ) - 2 ^ ( 4 + 4 ) ) / 2").ToArray();
  
    Expression expression = new Parser(tokens).ParseExpression();
  
    Ineterpreter.DictionaryContext context = new Ineterpreter.DictionaryContext();
  
    double result = Interpreter.Evaluate(expression);
    
    Console.WriteLine(result); // -112
  }
}

Define custom values and functions:

using SharpEval;
using SharpEval.Tokens;
using SharpEval.Expressions;

internal static class Program
{
  internal static void Main()
  {
    Interpreter.DictionaryContext context = Ineterpreter.DictionaryContext
    {
        Values =
        {
            ["x"] = 10.0d,
            ["y"] = 20.0d,
        },
        
        Functions =
        {
            ["sum"] = args => args.Sum(),
        },
    };
  
    Token[] tokens = new Tokenizer(" sum ( x , y ) ").ToArray();
    
    Expression expression = new Parser(tokens).ParseExpression();
    
    double result = Interpreter.Evaluate(expression, context);
    
    Console.WriteLine(result); // 30
  }
}

Contributing

Pull requests are welcome for the SharpEval project. If you would like to suggest a major change, please open an issue to discuss it before submitting the pull request.

Donation

If you like SharpEval, please consider supporting me by donating. Your generosity will be greatly appreciated. Click here to donate. Thank you for your support!