Parsing begins!

The PEG.js parser is now complete!!! Now all that is left to do is write the functions for the evaluator and control flow. For now I have locked the parser to only testing commands against MathExp as the root node. The function eval_math(tree) accepts a syntax tree with a root node marked as num for a plain numerical value, var for a reference to a variable, math for a simple add/sub/mult/div between two other math trees, or function which represents a call to a math function (built into the language). Below is an overview of the parse tree for a math expression (MathExp).

Math::Number

{ tag: "num", val: 0 }

Math::Variable

{
    tag: "var", 
    val: {
        id: "a",
        index: {
            // Another Math Expression
        }
    } 
}

Math::Math

{
    tag: "math", 
    val: {
        op: "+",
        left: {
            // Another Math Expression
        },
        right: {
            // Another Math Expression
        }
    } 
}

Math::Function

{
    tag: "function", 
    val: {
        func: "sqrt",
        param: {
            // Another Math Expression
        }
    } 
}

Math::Function (multiple params)

{
    tag: "function", 
    val: {
        func: "min",
        param: [
            {}, // Another Math Expression
            {}, // Another Math Expression
            {}  // Another Math Expression
        ]
    } 
}

Tags JOSS (Programming Language), PEG.js