feat: Divi composer – short/full form to blocks with structure rules, presets and labels

Labels, background_color and preset ids go through the choke point (S13);
ambiguous preset names fail with their ids (S13a); fullwidth + rows is an
error. Carry-ins: control characters stripped before the marker check (S32),
kind override may only tighten, reference alt texts dropped, color check via
VariableRef::typeOf (S33).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

tests/Unit/Integrations/Divi/Compose/ComposeFixture.php

@@ -5,10 +5,13 @@ declare(strict_types=1);
 namespace LIT\MCP\Tests\Unit\Integrations\Divi\Compose;
 
 use LIT\MCP\Integrations\Divi\Compose\AttrWriter;
+use LIT\MCP\Integrations\Divi\Compose\Composer;
 use LIT\MCP\Integrations\Divi\Compose\MediaResolver;
 use LIT\MCP\Integrations\Divi\Compose\Placeholders;
 use LIT\MCP\Integrations\Divi\Compose\ShortformWriter;
+use LIT\MCP\Integrations\Divi\Compose\StructureRules;
 use LIT\MCP\Integrations\Divi\Compose\ValueSanitizer;
+use LIT\MCP\Integrations\Divi\Design\DesignSystem;
 use LIT\MCP\Tests\Unit\Integrations\Divi\Design\DesignSystemTest;
 use LIT\MCP\Tests\Unit\Integrations\Divi\Schema\ModuleCatalogTest;
 
@@ -19,6 +22,9 @@ use LIT\MCP\Tests\Unit\Integrations\Divi\Schema\ModuleCatalogTest;
  */
 final class ComposeFixture
 {
+    /** A valid content reference as an attachment's alt text (media ids 44 and 45). */
+    public const REFERENCE_ALT = '$variable({"type":"content","value":{"name":"post_title","settings":{}}})$';
+
     public static function sanitizer(bool $unfiltered = false): ValueSanitizer
     {
         return new class ($unfiltered) implements ValueSanitizer {
@@ -26,12 +32,26 @@ final class ComposeFixture
             {
             }
 
-            /** Like sanitize_text_field: NUL bytes, tags and %XX octets go, then trim. */
+            /**
+             * Like sanitize_text_field (_sanitize_text_fields): tags only go when there is a "<"
+             * (wp_strip_all_tags; PHP's strip_tags also drops NUL then), whitespace runs become one
+             * space, trim, %XX octets go repeatedly. Without a "<", NUL and other control
+             * characters stay – as in WordPress (ruling S32: AttrWriter strips them).
+             */
             public function text(string $value): string
             {
-                $value = strip_tags(str_replace(chr(0), '', $value));
+                if (str_contains($value, '<')) {
+                    $value = strip_tags((string) preg_replace('@<(script|style)[^>]*?>.*?</\\1>@si', '', $value));
+                }
 
-                return trim((string) preg_replace('/%[a-f0-9]{2}/i', '', $value));
+                $value = trim((string) preg_replace('/[\r\n\t ]+/', ' ', $value));
+                $found = false;
+                while (preg_match('/%[a-f0-9]{2}/i', $value, $match) === 1) {
+                    $value = str_replace($match[0], '', $value);
+                    $found = true;
+                }
+
+                return $found ? trim((string) preg_replace('/ +/', ' ', $value)) : $value;
             }
 
             /**
@@ -89,6 +109,10 @@ final class ComposeFixture
                 return match ($id) {
                     33 => ['url' => 'https://kunde.test/wp-content/uploads/team.jpg', 'alt' => 'Unser Team'],
                     12 => ['url' => 'https://kunde.test/wp-content/uploads/halle.jpg', 'alt' => ''],
+                    // Alt texts carrying a reference, whole or NUL-split (ruling S33b: dropped).
+                    44 => ['url' => 'https://kunde.test/wp-content/uploads/a.jpg', 'alt' => ComposeFixture::REFERENCE_ALT],
+                    45 => ['url' => 'https://kunde.test/wp-content/uploads/b.jpg', 'alt' => '$variable' . chr(0)
+                        . substr(ComposeFixture::REFERENCE_ALT, strlen('$variable'))],
                     default => null,
                 };
             }
@@ -113,4 +137,29 @@ final class ComposeFixture
     {
         return new ShortformWriter(self::placeholders(), self::media(), self::attrWriter($unfiltered), $modules);
     }
+
+    public static function rules(): StructureRules
+    {
+        return new StructureRules(ModuleCatalogTest::sampleCatalog());
+    }
+
+    /**
+     * Builder version 5.2.1. $design replaces the sample design system (one Placeholders instance
+     * shared by AttrWriter and ShortformWriter, like the live wiring – ruling S31).
+     */
+    public static function composer(bool $unfiltered = false, ?DesignSystem $design = null): Composer
+    {
+        $design ??= DesignSystemTest::sample();
+        $placeholders = new Placeholders($design);
+        $attrWriter = new AttrWriter(ModuleCatalogTest::sampleCatalog(), $placeholders, self::sanitizer($unfiltered));
+
+        return new Composer(
+            ModuleCatalogTest::sampleCatalog(),
+            self::rules(),
+            new ShortformWriter($placeholders, self::media(), $attrWriter),
+            $attrWriter,
+            $design,
+            '5.2.1'
+        );
+    }
 }