feat(v3.2.7): expand WCAG ruleset to 127 rules, add HTML syntax linter, single-pass rule engine, template preprocessor, and accessibility analytics

src/Rules/AccesskeyDuplicate.php

@@ -0,0 +1,76 @@
+<?php
+
+namespace YakNet\AccessibilityConsole\Rules;
+
+use DOMElement;
+use YakNet\AccessibilityConsole\Core\AbstractRule;
+use YakNet\AccessibilityConsole\Core\Severity;
+use YakNet\AccessibilityConsole\Core\WCAGStandard;
+
+class AccesskeyDuplicate extends AbstractRule
+{
+    public function getId(): string
+    {
+        return 'WCAG_2_1_1_ACCESSKEY_DUPLICATE';
+    }
+
+    public function getDescription(): string
+    {
+        return 'accesskey attribute values must be unique across the document.';
+    }
+
+    public function getStandard(): WCAGStandard
+    {
+        return WCAGStandard::A;
+    }
+
+    public function getSeverity(): Severity
+    {
+        return Severity::ERROR;
+    }
+
+    public function getLevel(): int
+    {
+        return 2;
+    }
+
+    public function check(\DOMDocument $doc): array
+    {
+        $violations = [];
+        $xpath = new \DOMXPath($doc);
+        $elements = $xpath->query('//*[@accesskey]');
+
+        if ($elements === false || $elements->length === 0) {
+            return [];
+        }
+
+        $keys = [];
+        foreach ($elements as $el) {
+            if (!$el instanceof DOMElement) {
+                continue;
+            }
+            $val = trim($el->getAttribute('accesskey'));
+            if ($val === '') {
+                continue;
+            }
+            if (!isset($keys[$val])) {
+                $keys[$val] = [];
+            }
+            $keys[$val][] = $el;
+        }
+
+        foreach ($keys as $key => $elementsWithKey) {
+            if (count($elementsWithKey) > 1) {
+                foreach ($elementsWithKey as $el) {
+                    $violations[] = $this->createViolation(
+                        "Duplicate accesskey=\"{$key}\" found. Access keys must be unique across the document.",
+                        $el,
+                        "Assign a unique accesskey to each interactive element, or avoid using accesskey entirely."
+                    );
+                }
+            }
+        }
+
+        return $violations;
+    }
+}