fix(wit-grammar) handle inline comments

[mkatychev]

Handle inline comments and trailing commas in WIT

Resolves #XXX
References #YYY
Depends on #ZZZ

Description

[PR Description]

Checklist

Checklist before merging, wherever relevant:

• CHANGELOG.md updated
• Documentation (The Topiary Book, README.md, etc.) up-to-date

• Updated regression tests

[mkatychev]

getting some strange logic for newline separations, @Xophmeister any thoughts?

thread 'test_fmt::fmt_input_wit' panicked at topiary-core/src/test_utils.rs:6:9:

...
  2 // Packages and Comments
  3 // ==================

  4 // WIT grammar for tree-sitter
  5 //// WIT grammar for tree-sitter
...
 16 package wasmi:io:hello;
 17 package wasmi:io:hello/[email protected];
 18
 19 /// `stream` (no _s_) is a *type* that
 20 /// - can include a `<T>`
...
 62     import a: func();
 63 }
 64
 65 world world-two {
 66     import a: func();
...
186 // Gates
187 // ==================

188 @since(version = 0.1.0)
189 world imports {
...

[Xophmeister]

getting some strange logic for newline separations, @Xophmeister any thoughts?

The preserved blank line on L4 makes sense. You have the blank in the input and you have @allow_blank_line_before on (line_comment) nodes. (The same thing happens with the Gates section at the end: the blank on L180 is preserved.)

On L20-21 in the input (L18-19 in the output): you have a (package_decl) followed by a (line_comment), but no blank in the input...which I think makes sense given this rule:

(
  [
    (export_item)
    (func_item)
    (import_item)
    (include_item)
    (interface_item)
    (package_decl)
    (resource_item)
    (type_item)
    (resource_method)
    (since_gate)
    (deprecated_gate)
    (unstable_gate)
  ] @append_spaced_softline
  .
  [
    (block_comment)
    (line_comment)
  ]* @do_nothing
)

I guess those world world-one and world world-two on L65-66 in the input are ultimately using this rule:

(body
  .
  "{" @append_hardline @append_indent_start @prepend_space
  _
  "}" @append_hardline @prepend_hardline @prepend_indent_end
  .
) @append_hardline

I'm pretty sure the two @append_hardlines -- after } and at the end of the (body) -- will get merged together, so you lose the blank between functions.