AG-49899 Closing brackets are incorrectly highlighted in Element Hiding rules

Squashed commit of the following:

commit 7f04e04
Author: Kurbanali Ruslan <r.kurbanali@adguard.com>
Date:   Fri Jan 30 17:27:30 2026 +0500

    AG-49899 Closing brackets are incorrectly highlighted in Element Hiding rules

Author: kurrx

CHANGELOG.md

@@ -16,12 +16,14 @@ The format is based on [Keep a Changelog], and this project adheres to [Semantic
 ### Fixed
 
 - Highlighting for cosmetic rules modifiers [#134], [#151].
+- Highlighting nested selector in CSS pseudo-class [#156].
 
 [#120]: https://github.com/AdguardTeam/VscodeAdblockSyntax/issues/120
 [#131]: https://github.com/AdguardTeam/VscodeAdblockSyntax/issues/131
 [#134]: https://github.com/AdguardTeam/VscodeAdblockSyntax/issues/134
 [#137]: https://github.com/AdguardTeam/VscodeAdblockSyntax/issues/137
 [#151]: https://github.com/AdguardTeam/VscodeAdblockSyntax/issues/151
+[#156]: https://github.com/AdguardTeam/VscodeAdblockSyntax/issues/156
 
 ## [2.1.4] (prerelease) - 2025-12-26
 

syntaxes/adblock.yaml-tmlanguage

@@ -246,7 +246,7 @@ repository:
             name: keyword.control.adblock
           "4":
             patterns:
-              - include: "#cssSelector"
+              - include: "#htmlFilteringCssSelector"
 
   scriptletRules:
     patterns:
@@ -464,7 +464,7 @@ repository:
         match: "\\\\u[0-9A-Fa-f]{4}"
       - name: constant.character.escape.regexp
         match: "\\\\."
-      
+
       # Character class brackets
       - begin: "(\\[)(\\^)?"
         beginCaptures:
@@ -481,7 +481,7 @@ repository:
           - match: "\\\\[\\]\\-\\\\]"
             name: constant.character.escape.regexp
           - match: "[^\\]]"
-      
+
       # Groups and captures
       - begin: "(\\()(\\?[:=!<]|\\?<[=!]|\\?P?<[^>]+>)?"
         beginCaptures:
@@ -495,23 +495,23 @@ repository:
             name: punctuation.definition.group.regexp
         patterns:
           - include: "#regexp"
-      
+
       # Alternation
       - name: keyword.operator.or.regexp
         match: "\\|"
-      
+
       # Quantifiers
       - name: keyword.operator.quantifier.regexp
         match: "[*+?]\\??"
       - name: keyword.operator.quantifier.regexp
         match: "\\{\\d+(,\\d*)?\\}\\??"
-      
+
       # Anchors and boundaries
       - name: keyword.control.anchor.regexp
         match: "\\^|\\$"
       - name: keyword.control.anchor.regexp
         match: "\\\\[bB]"
-      
+
       # Backreferences
       - name: keyword.other.back-reference.regexp
         match: "\\\\[1-9]\\d*"
@@ -931,6 +931,11 @@ repository:
         match: ".*"
 
   cssSelector:
+    patterns:
+      - name: entity.name.function.adblock
+        match: ".+"
+
+  htmlFilteringCssSelector:
     patterns:
       # ID selector
       - match: |-
@@ -1087,7 +1092,25 @@ repository:
                   \s*                 #       Optional whitespace after regexp value
                 )
                 |(                    #     Group 13: unquoted value
-                  [^\)]+              #       Value is 1 or more non-) characters
+                  (?:                 #       Nested parentheses allowed up to 3 levels
+                    [^()]+            #       TODO: This can be improved to allow any level of nesting with recursion,
+                    |                 #       but to do so, the whole selector logic would need to be rewritten with begin/end.
+                    \(
+                      (?:
+                        [^()]+
+                        |
+                        \(
+                          (?:
+                            [^()]+
+                            |
+                            \(
+                              [^()]+
+                            \)
+                          )*
+                        \)
+                      )*
+                    \)
+                  )*
                 )
               )?
               (\))                    #   Group 14: Closing parenthesis

syntaxes/test/adblock/cosmetic/html.test.ts

@@ -554,6 +554,18 @@ describe('HTML filtering rules', () => {
                     { fragment: ')', scopes: PSEUDO_CLASS_CLOSE },
                 ],
             },
+            {
+                actual: '$$div:has(> div:not([class]) > a)',
+                expected: [
+                    { fragment: '$$', scopes: SEPARATOR },
+                    { fragment: 'div', scopes: TYPE_SELECTOR },
+                    { fragment: ':', scopes: PSEUDO_CLASS_PREFIX },
+                    { fragment: 'has', scopes: PSEUDO_CLASS },
+                    { fragment: '(', scopes: PSEUDO_CLASS_OPEN },
+                    { fragment: '> div:not([class]) > a', scopes: PSEUDO_CLASS_UNQUOTED },
+                    { fragment: ')', scopes: PSEUDO_CLASS_CLOSE },
+                ],
+            },
             {
                 actual: '$$tag > tag + tag ~ tag tag, tag + tag',
                 expected: [

test/static/rules/test_rules.txt

@@ -219,6 +219,7 @@ $$:class1(arg1), :class2("arg2"), :class3('arg3'), :class4(/arg4/i)
 $$:class1("arg \" 1"), :class2('arg \' 2'), :class3(/arg\/3/i)
 $$:class1( arg1 ), :class2( "arg2" ), :class3( 'arg3' ), :class4( /arg4/i )
 $$:class(arg with spaces), :class(multiple, args, here)
+$$div:has(> div:not([class]) > a)
 $$tag > tag + tag ~ tag tag, tag + tag
 example.org$$script[id="hello"][tag-content="hello"][max-length="100"]
 example.org,example.com$@$script[id="hello"][tag-content="something"]