feat!: align standard captures with upstream

Problem: Sharing highlight queries with upstream tree-sitter and
Helix is difficult.

Solution: Where reasonable, use capture names in tree-sitter's standard
list or Helix's Atom-style hierarchy.

Specifically:

* tree-sitter "standard capture names"
  (https://github.com/tree-sitter/tree-sitter/blob/3f44b896852eb7daaa6df4fb778c9bb52c70c815/highlight/src/lib.rs#L20-L72):

  - `@parameter` -> `@variable.parameter`
  - `@field` -> `@variable.member`
  - `@namespace` -> `@module`
  - `@float` -> `@number.float`
  - `@symbol` -> `@string.special.symbol`
  - `@string.regex` -> `@string.regexp`
  - `@text.*` -> `@markup.*` (`strong`, `italic`, `link`, `strikethrough`; with exceptions; see below)
  - `@text.title` -> `@markup.heading`
  - `@text.literal` -> `@markup.raw`
  - `@text.reference` -> `@markup.link`
  - `@text.uri` -> `@markup.link.url` (in markup links)
  - `@string.special` -> `@markup.link.label` (non-url links)
  - `@punctuation.special` -> `@markup.list` (markdown lists only; move subitems from `@text.todo`)

* Helix captures
  (https://docs.helix-editor.com/master/themes.html#syntax-highlighting):

  - `@method` -> `@function.method`
  - `@method.call` -> `@function.method.call`
  - `@text.{todo,warning,note,danger}` -> `@comment.{error,warning,hint,info,todo}`
  - `@text.diff.{add,delete,}` -> `@diff.{plus,minus,delta}`
  - `@text.uri` -> `@string.special.url` (outside markup)
  - `@preproc` -> `@keyword.directive`
  - `@define` -> `@keyword.directive`(`.define`?)
  - `@storageclass` -> `@keyword.storage`
  - `@conditional` -> `@keyword.conditional`
  - `@debug` -> `@keyword.debug`
  - `@exception` -> `@keyword.exception`
  - `@include` -> `@keyword.import`
  - `@repeat` -> `@keyword.repeat`

* cleanup

  - remove some redundant `@conceal` (but still allow it for conceal-only patterns)
  - remove obsolete `@error` (syntax linting is out of scope for this repo)
  - sort, cleanup capture list in `CONTRIBUTING.md`

1 files changed, 6 insertions, 6 deletions

diff --git a/queries/rego/highlights.scm b/queries/rego/highlights.scm
index 8d15d4fb4..5abaf0fd5 100644
--- a/queries/rego/highlights.scm
+++ b/queries/rego/highlights.scm
@@ -2,7 +2,7 @@
 [
   (import) 
   (package)
-] @include
+] @keyword.import
 
 [
   (with)
@@ -43,9 +43,9 @@
 
 (expr_call func_name: (fn_name (var) @function .))
 
-(expr_call func_arguments: (fn_args (expr) @parameter))
+(expr_call func_arguments: (fn_args (expr) @variable.parameter))
 
-(rule_args (term) @parameter)
+(rule_args (term) @variable.parameter)
 
 [
   (open_paren)
@@ -56,9 +56,9 @@
   (close_curly)
 ] @punctuation.bracket
 
-(rule (rule_head (var) @method))
+(rule (rule_head (var) @function.method))
 
 (rule 
-  (rule_head (term (ref (var) @namespace)))
-  (rule_body (query (literal (expr (expr_infix (expr (term (ref (var)) @_output)))))) (#eq? @_output @namespace))
+  (rule_head (term (ref (var) @module)))
+  (rule_body (query (literal (expr (expr_infix (expr (term (ref (var)) @_output)))))) (#eq? @_output @module))
 )