Cis/EC.Helper/RabbitFunc/RabbitFuncUtil.cs

using EC.Helper.RabbitFunc.Compiler;
using EC.Helper.RabbitFunc.Expressions;

namespace EC.Helper.RabbitFunc;

public class RabbitFuncUtil
{
    public static LambdaExpression CompileFromSource(string source)
    {
        if (source == null) throw new ArgumentNullException(nameof(source));

        LambdaExpression? lambda = null;
        using var reader = new StringReader(source);
        var tokenizer = new Tokenizer(reader);
        var parser = new Parser(tokenizer);
        while (!tokenizer.EndOfStream)
        {
            var expression = parser.Parse();
            if (expression == null) break;
            lambda = expression;
        }

        return lambda ?? throw new CompilerException(tokenizer.Position, "The formula was not found");
    }

    public static LambdaExpression CompileFromFile(string path)
    {
        if (path == null)
            throw new ArgumentNullException(nameof(path));

        LambdaExpression? lambda = null;
        using var stream = new FileStream(path, FileMode.Open, FileAccess.Read);
        using var reader = new StreamReader(stream, System.Text.Encoding.UTF8);
        var tokenizer = new Tokenizer(reader);
        var parser = new Parser(tokenizer);
        while (!tokenizer.EndOfStream)
        {
            var expression = parser.Parse();
            if (expression == null) break;
            lambda = expression;
        }

        return lambda ?? throw new CompilerException(tokenizer.Position, "The formula was not found");
    }
}