fix: don't wrap addition and deletion delimiters twice in embedded languages

src/Languages/Base/Patterns/AdditionEndTokenPattern.php

@@ -11,13 +11,15 @@
 use Tempest\Highlight\Tokens\TokenType;
 
 #[PatternTest('{+ pull_request_target: +}', '+}')]
+#[PatternTest('❷span class=❹ignore❹❸+}❷/span❸', null)]
 final readonly class AdditionEndTokenPattern implements Pattern
 {
     use IsPattern;
 
     public function getPattern(): string
     {
-        return '/(?<match>\+})/';
+        // A delimiter that is already ignored comes from code highlighted by a nested highlighter
+        return '/(?<!❹ignore❹❸)(?<match>\+})/';
     }
 
     public function getTokenType(): TokenType

src/Languages/Base/Patterns/AdditionStartTokenPattern.php

@@ -11,13 +11,15 @@
 use Tempest\Highlight\Tokens\TokenType;
 
 #[PatternTest('{+ pull_request_target: +}', '{+')]
+#[PatternTest('❷span class=❹ignore❹❸{+❷/span❸', null)]
 final readonly class AdditionStartTokenPattern implements Pattern
 {
     use IsPattern;
 
     public function getPattern(): string
     {
-        return '/(?<match>{\+)/';
+        // A delimiter that is already ignored comes from code highlighted by a nested highlighter
+        return '/(?<!❹ignore❹❸)(?<match>{\+)/';
     }
 
     public function getTokenType(): TokenType

src/Languages/Base/Patterns/DeletionEndTokenPattern.php

@@ -11,6 +11,7 @@
 use Tempest\Highlight\Tokens\TokenType;
 
 #[PatternTest('{- pull_request_target: -}', '-}')]
+#[PatternTest('❷span class=❹ignore❹❸-}❷/span❸', null)]
 #[PatternTest('{-- pull_request_target: --}', null)]
 #[PatternTest('{{- variable -}}', null)]
 final readonly class DeletionEndTokenPattern implements Pattern
@@ -19,7 +20,8 @@
 
     public function getPattern(): string
     {
-        return '/(?<!-)(?<match>\-})(?!})/';
+        // A delimiter that is already ignored comes from code highlighted by a nested highlighter
+        return '/(?<!-)(?<!❹ignore❹❸)(?<match>\-})(?!})/';
     }
 
     public function getTokenType(): TokenType

src/Languages/Base/Patterns/DeletionStartTokenPattern.php

@@ -13,13 +13,15 @@
 #[PatternTest('{- pull_request_target: -}', '{-')]
 #[PatternTest('{-- pull_request_target: --}', null)]
 #[PatternTest('{{- variable -}}', null)]
+#[PatternTest('❷span class=❹ignore❹❸{-❷/span❸', null)]
 final readonly class DeletionStartTokenPattern implements Pattern
 {
     use IsPattern;
 
     public function getPattern(): string
     {
-        return '/(?<!\{)(?<match>{\-)(?!-)/';
+        // A delimiter that is already ignored comes from code highlighted by a nested highlighter
+        return '/(?<!\{)(?<!❹ignore❹❸)(?<match>{\-)(?!-)/';
     }
 
     public function getTokenType(): TokenType

tests/Languages/Base/Injections/AdditionInjectionTest.php

@@ -36,4 +36,17 @@ public function test_null_content_is_prevented(): void
 
         $this->assertTrue(true);
     }
+
+    public function test_addition_ending_inside_an_embedded_language(): void
+    {
+        $content = "{+<script>+}\n    a;\n</script>";
+
+        $expected = <<<'TXT'
+<span class="hl-addition">&lt;<span class="hl-keyword">script</span>&gt;</span>
+    a;
+&lt;/<span class="hl-keyword">script</span>&gt;
+TXT;
+
+        $this->assertSame($expected, (new Highlighter())->parse($content, 'html'));
+    }
 }

tests/Languages/Base/Injections/DeletionInjectionTest.php

@@ -52,4 +52,17 @@ public function test_deletion_not_triggered_by_tag_whitespace_control()
 
         $this->assertSame($content, $parsedInjection->content);
     }
+
+    public function test_deletion_ending_inside_an_embedded_language(): void
+    {
+        $content = "{-<script>-}\n    a;\n</script>";
+
+        $expected = <<<'TXT'
+<span class="hl-deletion">&lt;<span class="hl-keyword">script</span>&gt;</span>
+    a;
+&lt;/<span class="hl-keyword">script</span>&gt;
+TXT;
+
+        $this->assertSame($expected, (new Highlighter())->parse($content, 'html'));
+    }
 }