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Treesitter query question, matching only substring of a node
From: |
Danny Freeman |
Subject: |
Treesitter query question, matching only substring of a node |
Date: |
Sun, 04 Dec 2022 13:27:07 -0500 |
Hello,
I am currently seeing what it will look like to add treesitter support
for clojure-mode. I am using this grammer:
https://github.com/sogaiu/tree-sitter-clojure
and it is working great so far.
It has definitions for nodes that match full namespaced keywords and
symbols, such that
:plain-keyword matches (kwd_lit) node
:namespace/keyword matches (kwd_lit) node
and similarly for symbols
'plain-symbol matches (sym_lit) node
'namespaced/symbol matches (sym_lit) node
In clojure, the part before the / character is the NAMESPACE, and the
part after the / character is the NAME.
The current clojure-mode highlights the namespaced part with a different
face than the name part.
I am trying to use this existing grammer to apply different faces to the
namespaced and named part. I can write a query that matches the whole
keyword easily, using `treesit-font-lock-rules`
```
(treesit-font-lock-rules
...
:feature 'keyword
:language 'clojure
'((kwd_lit) @clojure-keyword-face)
...
)
```
This works fine.
What I'm trying to do now is capture a substring of that node, the
namespaced part.
I can use the `:match` predicate to identify the namespace part, but the
matched group doesn't get captured by anything
```
(defvar kw-query
`((((kwd_lit) @kw)
(:match "^:.*/" @kw) ;; Can I capture this??
)))
(treesit-query-string ":namespaced/keyword" kw-query 'clojure)
```
Is something like this possible with the treesitter query engine in
Emacs? Or do I need to handle this at the grammer level? Perhaps with a
field?
There is an issue that was closed in the grammer's repository asking
about this, but their advise was to do some substring matching in the
editor, so here I am
https://github.com/sogaiu/tree-sitter-clojure/issues/28
--
Danny Freeman
- Treesitter query question, matching only substring of a node,
Danny Freeman <=