Subject: Re: 29.0.60; rust-ts-mode does not show function-invocation on field-properties

From: Randy Taylor <[email-masked]>
Date: Sun, 05 Feb 2023 21:30:59 +0000

On Sunday, February 5th, 2023 at 15:15, Jostein Kjønigsen <[email-masked]> wrote:

> Steps to reproduce:
>
> - set font-lock level 4 to enable highlighting of function-invocations
> - create a new buffer and activate rust-ts-mode
>
> Try writing a function which invokes functions indirectly trough field-properties. Example below:
>
> pub fn should_handle(url: String) -> bool {
> if url.ends_with(".css")
> || url.ends_with(".js")
> || url.ends_with(".png")
> || url.ends_with(".jpg")
> {
> false
> } else {
> true
> }
> }
> Observe that:
>
> - ends_with() is fontified as a property-access, not as a function-invocation.
> - (plain function invocation is highlighted as expected though)
>
> From my preliminary inspection of the rust-ts-mode source-code, this seems to be because of a very general override later in the file:
>
> rust-ts-mode.el, line 248 or so:
>
> :language 'rust
> :feature 'property
> :override t
> '((field_identifier) @font-lock-property-face
> (shorthand_field_initializer (identifier) @font-lock-property-face))
>
> Dissabling "override" for this feature fixes the fontification of method invocations, but I haven't done enough testing to see if there are other unexpected side-effects.

That's expected (at least to me) because it's a property. The same applies to c-ts-mode and go-ts-mode as well.