contrib/trace too verbose

[jsawbbo]

Hi all.

I have just started using PEGTL, so I beg for patience - maybe I overlooked alternatives for this:

I try to implement a grammar for which I find the contrib/trace a bit too verbose in some cases.

I suggest to add a "nofollow" option which still traces the current node but not any child.

I attached a possible implementation. Usage:

struct my_rule : sor</* ... */>, trace_nofollow {};

This will still trace my_rule but nothing under it.

Cheers, George trace-nofollow.diff.gz

[ColinH]

We looked into this issue, it's a reasonable request for a useful feature! We'd like to take more time to choose a more flexible (disable tracing for sub-tree or individual rules) and/or simpler implementation (no additional vector in the tracer state), and also make it non-intrusive wrt. the grammar.