SimpleParser 1.0.0-VER-01.35

SimpleParser

This project solves serveral problems

• Parse expression to ast tree and the possibilty of calculating the result
• Parse conditions 5+3 = 8 & 2*3 = 6, support
  • support =, !=, >, <, >=, ⇐, &, |
• Use external variables in an expression
• Use external functions in an expression
• Parse view template $"string length = {2+2}", result is "string length = 4"
• Serialize ast tree to json

How to use (Example)

internal static class InternalFuncs
{
    [FuncName("len")]
    public static int Len(IFuncExecuteContext context, string str)
    {
        return str?.Length ?? default;
    }
}

var identifier = new Dictionary<string, object>
{
    [x] = 5,
    [str] = "hello"
};

var funcTable = FuncTableFactory.Create(typeof(InternalFuncs));

var tree = LineParser.Parse("len(str)+x*2", identifier, funcTable);

var result = AstCalculator.Calculate(tree, identifier, funcTable);

Assert.True(result.IsNumber());
Assert.Equal(15, result.ToNumber());

var treeCondition = LineParser.Parse("len(str) = 5", identifier, funcTable);
var result = AstCalculator.Calculate(treeCondition, identifier, funcTable);

Assert.True(result.IsBoolean());
Assert.True(result.ToBoolean());