feat: add support for posix character classes

Author: amaanq

Package.resolved

@@ -0,0 +1,16 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "SwiftTreeSitter",
+        "repositoryURL": "https://github.com/ChimeHQ/SwiftTreeSitter",
+        "state": {
+          "branch": null,
+          "revision": "2599e95310b3159641469d8a21baf2d3d200e61f",
+          "version": "0.8.0"
+        }
+      }
+    ]
+  },
+  "version": 1
+}

grammar.js

@@ -59,6 +59,7 @@ module.exports = grammar({
         $.lookaround_assertion,
         $.pattern_character,
         $.character_class,
+        $.posix_character_class,
         $.any_character,
         $.decimal_escape,
         $.character_class_escape,
@@ -104,13 +105,23 @@ module.exports = grammar({
     character_class: $ => seq(
       '[',
       optional('^'),
-      repeat(choice(
-        $.class_range,
-        $._class_atom,
-      )),
+      choice(
+        repeat(choice(
+          $.class_range,
+          $._class_atom,
+        )),
+      ),
       ']',
     ),
 
+    posix_character_class: $ => seq(
+      '[:',
+      $.posix_class_name,
+      ':]',
+    ),
+
+    posix_class_name: _ => /[a-zA-Z]+/,
+
     class_range: $ => prec.right(
       seq($._class_atom, '-', $._class_atom),
     ),
@@ -121,6 +132,7 @@ module.exports = grammar({
       alias('\\-', $.identity_escape),
       $.character_class_escape,
       $._character_escape,
+      $.posix_character_class,
     ),
 
     class_character: _ => // NOT: \ ] or -

queries/highlights.scm

@@ -9,6 +9,8 @@
   "]"
   "{"
   "}"
+  "[:"
+  ":]"
 ] @punctuation.bracket
 
 (group_name) @property
@@ -45,6 +47,9 @@
     (class_range "-" @operator)
   ])
 
-(class_character) @constant.character
+[
+  (class_character)
+  (posix_class_name)
+] @constant.character
 
 (pattern_character) @string