feat: add PageTitle accessibility rule (WCAG 2.4.2)

demo/broken.html

@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <html>
 <head>
-    <title>Broken Page</title>
+    <title></title>
 </head>
 <body>
     <h1 id="main-content">Welcome to a broken page</h1>
@@ -30,6 +30,25 @@
     <!-- Missing Iframe Title -->
     <iframe src="https://www.youtube.com/embed/dQw4w9WgXcQ" width="560" height="315"></iframe>
 
+    <!-- New WCAG Rule Violations for testing -->
+    
+    <!-- LinkTextGeneric: Generic text without context -->
+    <a href="/read-more">Click here</a>
+    <a href="/devam-oku">devamını oku</a>
+    
+    <!-- PlaceholderAsLabel: Input relying only on placeholder -->
+    <input type="text" placeholder="Search website...">
+
+    <!-- ImageAltRedundant: Redundant words in alt text -->
+    <img src="logo2.png" alt="logo of our company">
+    <img src="profile.jpg" alt="profile photo of john doe">
+
+    <!-- AriaHiddenFocusable: Focusable element hidden with aria-hidden="true" -->
+    <div aria-hidden="true">
+        <button type="button">Hidden click</button>
+    </div>
+    <a href="#" aria-hidden="true">Hidden link</a>
+
     <p>This page has multiple accessibility issues.</p>
 </body>
 </html>

src/Rules/AriaHiddenFocusable.php

@@ -0,0 +1,87 @@
+<?php
+
+namespace YakNet\AccessibilityConsole\Rules;
+
+use DOMElement;
+use YakNet\AccessibilityConsole\Core\Severity;
+use YakNet\AccessibilityConsole\Core\Violation;
+use YakNet\AccessibilityConsole\Core\WCAGStandard;
+
+class AriaHiddenFocusable extends AbstractRule
+{
+    public function getId(): string { return 'WCAG_4_1_2_ARIA_HIDDEN_FOCUS'; }
+    public function getDescription(): string { return 'Focusable elements must not be hidden with aria-hidden="true".'; }
+    public function getStandard(): WCAGStandard { return WCAGStandard::A; }
+    public function getSeverity(): Severity { return Severity::ERROR; }
+
+    public function check(DOMElement $element): ?Violation
+    {
+        if ($element->getAttribute('aria-hidden') !== 'true') {
+            return null;
+        }
+
+        if ($this->isFocusable($element) || $this->hasFocusableDescendant($element)) {
+            return $this->createViolation(
+                $element,
+                $this->getDescription(),
+                'Remove aria-hidden="true" from the container or make its focusable elements non-focusable (e.g. by setting tabindex="-1" or disabled).'
+            );
+        }
+
+        return null;
+    }
+
+    private function isFocusable(DOMElement $element): bool
+    {
+        $tagName = strtolower($element->tagName);
+
+        if ($element->hasAttribute('tabindex')) {
+            $tabindex = (int)$element->getAttribute('tabindex');
+            if ($tabindex < 0) {
+                return false;
+            }
+            return true;
+        }
+
+        if ($tagName === 'a' && $element->hasAttribute('href')) {
+            return true;
+        }
+
+        if (in_array($tagName, ['button', 'select', 'textarea'], true)) {
+            return !$element->hasAttribute('disabled');
+        }
+
+        if ($tagName === 'input') {
+            $type = strtolower($element->getAttribute('type'));
+            return $type !== 'hidden' && !$element->hasAttribute('disabled');
+        }
+
+        if ($tagName === 'iframe') {
+            return true;
+        }
+
+        return false;
+    }
+
+    private function hasFocusableDescendant(DOMElement $element): bool
+    {
+        $doc = $element->ownerDocument;
+        if ($doc === null) {
+            return false;
+        }
+
+        $xpath = new \DOMXPath($doc);
+        $descendants = $xpath->query('.//*', $element);
+        if ($descendants === false) {
+            return false;
+        }
+
+        foreach ($descendants as $descendant) {
+            if ($descendant instanceof DOMElement && $this->isFocusable($descendant)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}

src/Rules/ImageAltRedundant.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace YakNet\AccessibilityConsole\Rules;
+
+use DOMElement;
+use YakNet\AccessibilityConsole\Core\Severity;
+use YakNet\AccessibilityConsole\Core\Violation;
+use YakNet\AccessibilityConsole\Core\WCAGStandard;
+
+class ImageAltRedundant extends AbstractRule
+{
+    public function getId(): string { return 'WCAG_1_1_1_ALT_REDUNDANT'; }
+    public function getDescription(): string { return 'Image alt text should not contain redundant words like "image" or "photo".'; }
+    public function getStandard(): WCAGStandard { return WCAGStandard::A; }
+    public function getSeverity(): Severity { return Severity::WARNING; }
+
+    /** @var array<int, string> */
+    private array $redundantWords = [
+        'resmi', 'görüntüsü', 'fotoğrafı', 'grafiği', 'logosu', 'ikonu',
+        'image of', 'photo of', 'picture of', 'graphic of', 'logo of', 'icon of'
+    ];
+
+    public function check(DOMElement $element): ?Violation
+    {
+        if (strtolower($element->tagName) !== 'img') {
+            return null;
+        }
+
+        if (!$element->hasAttribute('alt')) {
+            return null;
+        }
+
+        $alt = trim($element->getAttribute('alt'));
+        $cleanAlt = strtolower(preg_replace('/\s+/', ' ', $alt) ?? '');
+
+        if ($cleanAlt === '') {
+            return null;
+        }
+
+        foreach ($this->redundantWords as $word) {
+            if (str_starts_with($cleanAlt, $word) || str_contains($cleanAlt, ' ' . $word)) {
+                return $this->createViolation(
+                    $element,
+                    $this->getDescription(),
+                    'Remove redundant phrases like "' . $word . '" from the alt text. Screen readers already announce elements as images.'
+                );
+            }
+        }
+
+        return null;
+    }
+}

src/Rules/LinkTextGeneric.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace YakNet\AccessibilityConsole\Rules;
+
+use DOMElement;
+use YakNet\AccessibilityConsole\Core\Severity;
+use YakNet\AccessibilityConsole\Core\Violation;
+use YakNet\AccessibilityConsole\Core\WCAGStandard;
+
+class LinkTextGeneric extends AbstractRule
+{
+    public function getId(): string { return 'WCAG_2_4_4_LINK_GENERIC'; }
+    public function getDescription(): string { return 'Links must have descriptive text. Generic text like "click here" or "read more" is not accessible.'; }
+    public function getStandard(): WCAGStandard { return WCAGStandard::A; }
+    public function getSeverity(): Severity { return Severity::WARNING; }
+
+    /** @var array<int, string> */
+    private array $genericWords = [
+        'click here', 'click', 'read more', 'more', 'here', 'download', 'go', 'details', 'link', 'website', 'page', 'info',
+        'tıkla', 'tıklayın', 'devamı', 'devamını oku', 'indir', 'git', 'detay', 'detaylar', 'link', 'site', 'sayfa', 'bilgi'
+    ];
+
+    public function check(DOMElement $element): ?Violation
+    {
+        if (strtolower($element->tagName) !== 'a') {
+            return null;
+        }
+
+        $text = trim($element->textContent);
+        $cleanText = strtolower(preg_replace('/\s+/', ' ', $text) ?? '');
+
+        if (in_array($cleanText, $this->genericWords, true)) {
+            // Check for descriptive attributes
+            if ($element->hasAttribute('aria-label') || $element->hasAttribute('aria-labelledby') || $element->hasAttribute('title')) {
+                return null;
+            }
+
+            return $this->createViolation(
+                $element,
+                $this->getDescription(),
+                'Change the link text to describe its target, or add an aria-label attribute to provide context.'
+            );
+        }
+
+        return null;
+    }
+}

src/Rules/PageTitle.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace YakNet\AccessibilityConsole\Rules;
+
+use DOMElement;
+use YakNet\AccessibilityConsole\Core\Severity;
+use YakNet\AccessibilityConsole\Core\Violation;
+use YakNet\AccessibilityConsole\Core\WCAGStandard;
+
+class PageTitle extends AbstractRule
+{
+    public function getId(): string { return 'WCAG_2_4_2_PAGE_TITLE'; }
+    public function getDescription(): string { return 'Web pages must have a non-empty title element in the head.'; }
+    public function getStandard(): WCAGStandard { return WCAGStandard::A; }
+    public function getSeverity(): Severity { return Severity::ERROR; }
+
+    public function check(DOMElement $element): ?Violation
+    {
+        if (strtolower($element->tagName) !== 'head') {
+            return null;
+        }
+
+        $titles = $element->getElementsByTagName('title');
+        
+        if ($titles->length === 0) {
+            return $this->createViolation(
+                $element,
+                $this->getDescription(),
+                'Add a <title> element inside the <head>.'
+            );
+        }
+
+        $titleText = '';
+        $firstTitle = $titles->item(0);
+        if ($firstTitle !== null) {
+            $titleText = trim($firstTitle->textContent);
+        }
+
+        if ($titleText === '') {
+            return $this->createViolation(
+                $element,
+                $this->getDescription(),
+                'Provide descriptive text inside the <title> element.'
+            );
+        }
+
+        return null;
+    }
+}

src/Rules/PlaceholderAsLabel.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace YakNet\AccessibilityConsole\Rules;
+
+use DOMElement;
+use YakNet\AccessibilityConsole\Core\Severity;
+use YakNet\AccessibilityConsole\Core\Violation;
+use YakNet\AccessibilityConsole\Core\WCAGStandard;
+
+class PlaceholderAsLabel extends AbstractRule
+{
+    public function getId(): string { return 'WCAG_3_3_2_PLACEHOLDER_LABEL'; }
+    public function getDescription(): string { return 'Inputs should not use placeholder text as their only label.'; }
+    public function getStandard(): WCAGStandard { return WCAGStandard::A; }
+    public function getSeverity(): Severity { return Severity::WARNING; }
+
+    public function check(DOMElement $element): ?Violation
+    {
+        $tags = ['input', 'select', 'textarea'];
+        if (!in_array(strtolower($element->tagName), $tags, true)) {
+            return null;
+        }
+
+        // Skip hidden inputs, buttons, etc.
+        $type = strtolower($element->getAttribute('type'));
+        if ($type === 'hidden' || $type === 'submit' || $type === 'button' || $type === 'reset') {
+            return null;
+        }
+
+        // If it doesn't have a placeholder, this rule doesn't apply (FormLabel handles general missing labels)
+        if (!$element->hasAttribute('placeholder')) {
+            return null;
+        }
+
+        // Check if there is an aria-label or aria-labelledby
+        if ($element->hasAttribute('aria-label') || $element->hasAttribute('aria-labelledby')) {
+            return null;
+        }
+
+        // Check for associated label element
+        if ($element->hasAttribute('id')) {
+            $id = $element->getAttribute('id');
+            $doc = $element->ownerDocument;
+            if ($doc !== null) {
+                $xpath = new \DOMXPath($doc);
+                $labels = $xpath->query("//label[@for='$id']");
+                if ($labels !== false && $labels->length > 0) {
+                    return null;
+                }
+            }
+        }
+
+        // Check if wrapped in label
+        $parent = $element->parentNode;
+        while ($parent) {
+            if ($parent instanceof DOMElement && strtolower($parent->tagName) === 'label') {
+                return null;
+            }
+            $parent = $parent->parentNode;
+        }
+
+        return $this->createViolation(
+            $element,
+            $this->getDescription(),
+            'Add a <label for="..."> or an aria-label attribute. Placeholder text is not a reliable label replacement.'
+        );
+    }
+}

src/Rules/StandardRuleSet.php

@@ -24,6 +24,11 @@ class StandardRuleSet
             new DuplicateId(),
             new AriaRole(),
             new IframeTitle(),
+            new LinkTextGeneric(),
+            new PlaceholderAsLabel(),
+            new ImageAltRedundant(),
+            new AriaHiddenFocusable(),
+            new PageTitle(),
         ];
         return $rules;
     }

src/Source/SourceLocator.php

@@ -34,7 +34,17 @@ class SourceLocator
 
         try {
             $directory = new RecursiveDirectoryIterator($this->searchPath, \FilesystemIterator::SKIP_DOTS);
-            $iterator = new RecursiveIteratorIterator($directory, RecursiveIteratorIterator::SELF_FIRST);
+            $filter = new \RecursiveCallbackFilterIterator($directory, function ($current) {
+                /** @var SplFileInfo $current */
+                if ($current->isDir()) {
+                    $filename = $current->getFilename();
+                    if ($filename === 'vendor' || $filename === '.git' || $filename === 'node_modules') {
+                        return false;
+                    }
+                }
+                return true;
+            });
+            $iterator = new RecursiveIteratorIterator($filter, RecursiveIteratorIterator::SELF_FIRST);
         } catch (\UnexpectedValueException) {
             return null;
         }