modifing binding power of the unary "plus" and "dash"

[table-harmony]

Sense the binding power of the prefix "dash" was unary, it was above the binding power of multiplicative.
Therefore it would have higher precedence: 10 * 10 - 10, for this case the dash would be parsed as a unary and not the correct additive.

As you can see the binary expression is parsed as a left for 10 and a right for the binary expression 10 - 10 which is wrong.
That is way in this commit I have changed the binding power of the token "dash" and added the token "plus" as prefix operations such as +10, -10 and modified their binding power to additive sense a "dash" prefix is identical to 0 - 10 and therefore should be parsed with the binding power of additive

[skandragon]

I don't think this has an actual effect.

The nud function looks like this:

func nud (kind lexer.TokenKind, bp binding_power, nud_fn nud_handler) {
	bp_lu[kind] = primary
	nud_lu[kind] = nud_fn
}

While it takes in a binding power, it doesn't use it.

I came here to see what the resulting code was, but while the video removed that param, the code here still has it, but it doesn't do anything from what I can see.

That said, this errors out:

stmt := `45.2 + 5 * 4 - -5;`

I'm not sure of the fix yet.

[table-harmony]

Hello actually I believe it is the solution sense I have made my own interpreter in go while following the base of this tutorial and it does work for me

while this is the parser