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, 10 insertions, 10 deletions

diff --git a/queries/squirrel/highlights.scm b/queries/squirrel/highlights.scm
index b0b9caf56..5fa20881c 100644
--- a/queries/squirrel/highlights.scm
+++ b/queries/squirrel/highlights.scm
@@ -40,7 +40,7 @@
   "case"
   "default"
   "break"
-] @conditional
+] @keyword.conditional
 
 ; Repeats
 
@@ -50,7 +50,7 @@
   "do"
   "while"
   "continue"
-] @repeat
+] @keyword.repeat
 
 ; Exceptions
 
@@ -58,13 +58,13 @@
   "try"
   "catch"
   "throw"
-] @exception
+] @keyword.exception
 
 ; Storageclasses
 
 [
   "local"
-] @storageclass
+] @keyword.storage
 
 ; Qualifiers
 
@@ -90,7 +90,7 @@
 ; Parameters
 
 (parameter
-  . (identifier) @parameter)
+  . (identifier) @variable.parameter)
 
 ; Properties (Slots)
 
@@ -128,7 +128,7 @@
 
 (member_declaration
   (function_declaration
-    "::"? (_) @method . "(" (_)? ")"))
+    "::"? (_) @function.method . "(" (_)? ")"))
 
 ((function_declaration
    "::"? (_) @function . "(" (_)? ")")
@@ -150,7 +150,7 @@
   (identifier) @function
   "="
   (lambda_expression
-    "@" @symbol))
+    "@" @string.special.symbol))
 
 (call_expression 
   [
@@ -278,8 +278,8 @@
 ; Ternaries
 
 (ternary_expression
-  "?" @conditional.ternary
-  ":" @conditional.ternary)
+  "?" @keyword.conditional.ternary
+  ":" @keyword.conditional.ternary)
 
 ; Literals
 
@@ -293,7 +293,7 @@
 
 (integer) @number
 
-(float) @float
+(float) @number.float
 
 (bool) @boolean