Parsing problem

[Nicolas Capens]

Hi Alec,

I have some parsing code that looks like below. It is used for masking x, y, z and w components of a 4D vector:

        <DOT> {...}

        (
            (<X> {...})
            (<Y> {...})?
            (<Z> {...})?
            (<W> {...})?
        )
            |
        (
            (<Y> {...})
            (<Z> {...})?
            (<W> {...})?
        )
            |
        (
            (<Z> {...})
            (<W> {...})?
        )
            |
        (
            (<W> {.})
        )

The problem is that when it finds the DOT, it also wants to consume a X token. This isn't correct since this grammar should also accept code like ".yw", but then it throws a parsing error.

I probably defined this wrongly?

[Nicolas Capens]

My error, sorry!

I forgot about the operator precedence rules, some extra parentheses solved it...

CppCC rocks!