Hi everyone, I'm interesting in dynamically defining grammar components. I have a big list of nouns, I'd like to incorporate them into my grammar without too much crazy. Is there some way I can add in a dynamic rule with something like nouns = coll?

You probably want instaparse.combinators

thanks!

i shall take a gander

https://github.com/engelberg/instaparse#combinators

Would it be ok to do something like (str/join "|" nouns-seq) in the grammar def

that might be more error-prone and hard to read, but it wouldn’t be more or less efficient than the combinator version

Okay cool

How many nouns are we talking? I’d be wary of putting too many into a parser rule

Because to parse text that satisfies the rule, it ultimately has to iterate through every option at every point in your text that could potentially be a noun

And if you pass a string to the parser that doesn’t successfully parse, the “failure” message will be really long

I'm using about 5-20 nouns

ah ok, that’s definitely manageable

I'm trying to just do string join on the nouns list I have, but they lose their quotes

maybe (apply str/join "|" (map #(str "'" % "'") nouns-seq))

ah beautiful

thank you very much

almost perfect, it gives me a ('list' 'of' 'nouns') .. not sure how to make it digestible for the parser

I think that’s where the apply str/join comes in

oops, I was wrong, you don’t need apply

just (str/join "|" …)

Excellent! Thank you.

I'm looking forward to showing you guys what I've come up with, once it's done! 😃

can’t wait to see!

it's a great wonder to have the power of magic at your fingertips! 😄

I keep ending up with a vector although I would like to use a map... I don't know if it's clojurescript

you mean for the input or the output?

the output of insta/parse

you can set :output-format :enlive to get a map out of the parser

wizardry

Hmm, not bad, but it has :tag and :content, I could do with simply swapping [] with {}

Thanks for all the help, I'll scratch around

Can instaparse flatten a recursive structure with a rule?