fix: run the same inline rules inside every nested token

src/Tokens/BoldAndItalicToken.php

@@ -3,6 +3,8 @@
 namespace Tempest\Markdown\Tokens;
 
 use Tempest\Markdown\Parser;
+use Tempest\Markdown\Rules\CodeRule;
+use Tempest\Markdown\Rules\ImageRule;
 use Tempest\Markdown\Rules\LinkRule;
 use Tempest\Markdown\Rules\SocialHandleRule;
 use Tempest\Markdown\Rules\StrikethroughRule;
@@ -20,8 +22,10 @@ public function parse(Parser $parser): string
         $content = $parser
             ->forToken($this, [
                 new StrikethroughRule(),
+                new CodeRule(),
                 new LinkRule(),
                 new SocialHandleRule(),
+                new ImageRule(),
                 new TextRule(),
             ])
             ->parse($this->content);

src/Tokens/BoldToken.php

@@ -3,6 +3,8 @@
 namespace Tempest\Markdown\Tokens;
 
 use Tempest\Markdown\Parser;
+use Tempest\Markdown\Rules\CodeRule;
+use Tempest\Markdown\Rules\ImageRule;
 use Tempest\Markdown\Rules\ItalicRule;
 use Tempest\Markdown\Rules\LinkRule;
 use Tempest\Markdown\Rules\SocialHandleRule;
@@ -22,8 +24,10 @@ public function parse(Parser $parser): string
             ->forToken($this, [
                 new ItalicRule(),
                 new StrikethroughRule(),
+                new CodeRule(),
                 new LinkRule(),
                 new SocialHandleRule(),
+                new ImageRule(),
                 new TextRule(),
             ])
             ->parse($this->content);

src/Tokens/DivToken.php

@@ -13,6 +13,7 @@
 use Tempest\Markdown\Rules\PreRule;
 use Tempest\Markdown\Rules\QuoteRule;
 use Tempest\Markdown\Rules\SocialHandleRule;
+use Tempest\Markdown\Rules\StrikethroughRule;
 use Tempest\Markdown\Rules\TextRule;
 use Tempest\Markdown\Token;
 
@@ -32,6 +33,7 @@ public function parse(Parser $parser): string
                 new BoldAndItalicRule(),
                 new BoldRule(),
                 new ItalicRule(),
+                new StrikethroughRule(),
                 new LinkRule(),
                 new SocialHandleRule(),
                 new ImageRule(),

src/Tokens/HeadingToken.php

@@ -6,6 +6,7 @@
 use Tempest\Markdown\Rules\BoldAndItalicRule;
 use Tempest\Markdown\Rules\BoldRule;
 use Tempest\Markdown\Rules\CodeRule;
+use Tempest\Markdown\Rules\ImageRule;
 use Tempest\Markdown\Rules\ItalicRule;
 use Tempest\Markdown\Rules\LinkRule;
 use Tempest\Markdown\Rules\SocialHandleRule;
@@ -39,6 +40,7 @@ public function parse(Parser $parser): string
                 new StrikethroughRule(),
                 new LinkRule(),
                 new SocialHandleRule(),
+                new ImageRule(),
                 new CodeRule(),
                 new TextRule(),
             ])

src/Tokens/ItalicToken.php

@@ -4,6 +4,8 @@
 
 use Tempest\Markdown\Parser;
 use Tempest\Markdown\Rules\BoldRule;
+use Tempest\Markdown\Rules\CodeRule;
+use Tempest\Markdown\Rules\ImageRule;
 use Tempest\Markdown\Rules\LinkRule;
 use Tempest\Markdown\Rules\SocialHandleRule;
 use Tempest\Markdown\Rules\StrikethroughRule;
@@ -22,8 +24,10 @@ public function parse(Parser $parser): string
             ->forToken($this, [
                 new BoldRule(),
                 new StrikethroughRule(),
+                new CodeRule(),
                 new LinkRule(),
                 new SocialHandleRule(),
+                new ImageRule(),
                 new TextRule(),
             ])
             ->parse($this->content);

src/Tokens/ListToken.php

@@ -10,6 +10,7 @@
 use Tempest\Markdown\Rules\ItalicRule;
 use Tempest\Markdown\Rules\LinkRule;
 use Tempest\Markdown\Rules\SocialHandleRule;
+use Tempest\Markdown\Rules\StrikethroughRule;
 use Tempest\Markdown\Rules\TextRule;
 use Tempest\Markdown\Token;
 
@@ -26,6 +27,7 @@ public function parse(Parser $parser): string
             new BoldAndItalicRule(),
             new BoldRule(),
             new ItalicRule(),
+            new StrikethroughRule(),
             new LinkRule(),
             new SocialHandleRule(),
             new ImageRule(),

src/Tokens/OrderedListToken.php

@@ -10,6 +10,7 @@
 use Tempest\Markdown\Rules\ItalicRule;
 use Tempest\Markdown\Rules\LinkRule;
 use Tempest\Markdown\Rules\SocialHandleRule;
+use Tempest\Markdown\Rules\StrikethroughRule;
 use Tempest\Markdown\Rules\TextRule;
 use Tempest\Markdown\Token;
 
@@ -26,6 +27,7 @@ public function parse(Parser $parser): string
             new BoldAndItalicRule(),
             new BoldRule(),
             new ItalicRule(),
+            new StrikethroughRule(),
             new LinkRule(),
             new SocialHandleRule(),
             new ImageRule(),

src/Tokens/QuoteToken.php

@@ -5,11 +5,13 @@
 use Tempest\Markdown\Parser;
 use Tempest\Markdown\Rules\BoldAndItalicRule;
 use Tempest\Markdown\Rules\BoldRule;
+use Tempest\Markdown\Rules\CodeRule;
 use Tempest\Markdown\Rules\ImageRule;
 use Tempest\Markdown\Rules\ItalicRule;
 use Tempest\Markdown\Rules\LinkRule;
 use Tempest\Markdown\Rules\QuoteRule;
 use Tempest\Markdown\Rules\SocialHandleRule;
+use Tempest\Markdown\Rules\StrikethroughRule;
 use Tempest\Markdown\Rules\TextRule;
 use Tempest\Markdown\Token;
 
@@ -26,6 +28,8 @@ public function parse(Parser $parser): string
                 new BoldAndItalicRule(),
                 new BoldRule(),
                 new ItalicRule(),
+                new StrikethroughRule(),
+                new CodeRule(),
                 new QuoteRule(),
                 new LinkRule(),
                 new SocialHandleRule(),

src/Tokens/StrikethroughToken.php

@@ -5,6 +5,8 @@
 use Tempest\Markdown\Parser;
 use Tempest\Markdown\Rules\BoldAndItalicRule;
 use Tempest\Markdown\Rules\BoldRule;
+use Tempest\Markdown\Rules\CodeRule;
+use Tempest\Markdown\Rules\ImageRule;
 use Tempest\Markdown\Rules\ItalicRule;
 use Tempest\Markdown\Rules\LinkRule;
 use Tempest\Markdown\Rules\SocialHandleRule;
@@ -24,8 +26,10 @@ public function parse(Parser $parser): string
                 new BoldAndItalicRule(),
                 new BoldRule(),
                 new ItalicRule(),
+                new CodeRule(),
                 new LinkRule(),
                 new SocialHandleRule(),
+                new ImageRule(),
                 new TextRule(),
             ])
             ->parse($this->content);

src/Tokens/TableToken.php

@@ -10,6 +10,7 @@
 use Tempest\Markdown\Rules\ItalicRule;
 use Tempest\Markdown\Rules\LinkRule;
 use Tempest\Markdown\Rules\SocialHandleRule;
+use Tempest\Markdown\Rules\StrikethroughRule;
 use Tempest\Markdown\Rules\TextRule;
 use Tempest\Markdown\Token;
 
@@ -26,6 +27,7 @@ public function parse(Parser $parser): string
             new BoldAndItalicRule(),
             new BoldRule(),
             new ItalicRule(),
+            new StrikethroughRule(),
             new LinkRule(),
             new SocialHandleRule(),
             new CodeRule(),

tests/NestedInlineRuleTest.php

@@ -0,0 +1,150 @@
+<?php
+
+namespace Tempest\Markdown\Tests;
+
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\Test;
+use Tempest\Markdown\Markdown;
+
+/**
+ * Every token that holds inline content runs the same set of inline rules, so
+ * the same Markdown renders the same way whichever container it sits in.
+ */
+final class NestedInlineRuleTest extends ParserTestCase
+{
+    #[Test]
+    #[DataProvider('provideNestedInline')]
+    public function inline_rules_apply_inside_every_container(
+        string $markdown,
+        string $expected,
+    ): void {
+        $this->assertSame(
+            $expected,
+            trim(new Markdown(highlighter: null)->parse($markdown)->html),
+        );
+    }
+
+    public static function provideNestedInline(): iterable
+    {
+        yield 'code in a paragraph' => [
+            '`code`',
+            '<p><code>code</code></p>',
+        ];
+
+        yield 'code in a heading' => [
+            '# `code`',
+            '<h1 id="code"><code>code</code></h1>',
+        ];
+
+        yield 'code in a blockquote' => [
+            '> `code`',
+            '<blockquote><code>code</code></blockquote>',
+        ];
+
+        yield 'code in bold' => [
+            '**`code`**',
+            '<p><strong><code>code</code></strong></p>',
+        ];
+
+        yield 'code in italic' => [
+            '*`code`*',
+            '<p><em><code>code</code></em></p>',
+        ];
+
+        yield 'code in bold italic' => [
+            '***`code`***',
+            '<p><strong><em><code>code</code></em></strong></p>',
+        ];
+
+        yield 'code in strikethrough' => [
+            '~~`code`~~',
+            '<p><s><code>code</code></s></p>',
+        ];
+
+        yield 'image in a paragraph' => [
+            '![alt](img.png)',
+            '<p><img src="img.png" alt="alt"></p>',
+        ];
+
+        yield 'image in a heading' => [
+            '# ![alt](img.png)',
+            '<h1 id="alt-img-png"><img src="img.png" alt="alt"></h1>',
+        ];
+
+        yield 'image in bold' => [
+            '**![alt](img.png)**',
+            '<p><strong><img src="img.png" alt="alt"></strong></p>',
+        ];
+
+        yield 'image in italic' => [
+            '*![alt](img.png)*',
+            '<p><em><img src="img.png" alt="alt"></em></p>',
+        ];
+
+        yield 'image in bold italic' => [
+            '***![alt](img.png)***',
+            '<p><strong><em><img src="img.png" alt="alt"></em></strong></p>',
+        ];
+
+        yield 'image in strikethrough' => [
+            '~~![alt](img.png)~~',
+            '<p><s><img src="img.png" alt="alt"></s></p>',
+        ];
+
+        yield 'strikethrough in a paragraph' => [
+            '~~struck~~',
+            '<p><s>struck</s></p>',
+        ];
+
+        yield 'strikethrough in a list item' => [
+            '- ~~struck~~',
+            '<ul><li><s>struck</s></li></ul>',
+        ];
+
+        yield 'strikethrough in an ordered list item' => [
+            '1. ~~struck~~',
+            '<ol><li><s>struck</s></li></ol>',
+        ];
+
+        yield 'strikethrough in a table cell' => [
+            "| h |\n| - |\n| ~~struck~~ |",
+            '<table><thead><tr><th>h</th></tr></thead>'
+                . '<tbody><tr><td><s>struck</s></td></tr></tbody></table>',
+        ];
+
+        yield 'strikethrough in a blockquote' => [
+            '> ~~struck~~',
+            '<blockquote><s>struck</s></blockquote>',
+        ];
+
+        yield 'strikethrough in a div' => [
+            ":::\n~~struck~~\n:::\n",
+            "<div><s>struck</s>\n</div>",
+        ];
+    }
+
+    #[Test]
+    #[DataProvider('provideSelfNesting')]
+    public function a_rule_does_not_nest_in_the_token_it_produces(
+        string $markdown,
+        string $expected,
+    ): void {
+        $this->assertSame(
+            $expected,
+            trim(new Markdown(highlighter: null)->parse($markdown)->html),
+        );
+    }
+
+    public static function provideSelfNesting(): iterable
+    {
+        yield 'a link does not nest in a link' => [
+            '[a [b](https://b.test) c](https://a.test)',
+            '<p><a href="https://a.test">a [b](https://b.test) c</a></p>',
+        ];
+
+        yield 'a social handle does not nest in a link' => [
+            '[{x:tempestphp}](https://a.test)',
+            '<p><a href="https://a.test">{x:tempestphp}</a></p>',
+        ];
+    }
+}