build: upgrade PHPStan to level 9 and fix strict type errors

phpstan.neon

@@ -0,0 +1,4 @@
+parameters:
+    level: 9
+    paths:
+        - src

src/Console/Command/FixCommand.php

@@ -30,8 +30,16 @@ class FixCommand extends Command
     {
         $io = new SymfonyStyle($input, $output);
         $target = $input->getArgument('target');
-        $projectPath = $input->getOption('project-path') ?? getcwd();
-        $dryRun = $input->getOption('dry-run');
+        if (!is_string($target)) {
+            $io->error("Target must be a string URL or file path.");
+            return Command::FAILURE;
+        }
+        $projectPathOption = $input->getOption('project-path');
+        $projectPath = is_string($projectPathOption) ? $projectPathOption : getcwd();
+        if ($projectPath === false) {
+            $projectPath = '.';
+        }
+        $dryRun = (bool)$input->getOption('dry-run');
 
         $config = new Config();
         $apiKey = $config->getGeminiApiKey();
@@ -45,7 +53,7 @@ class FixCommand extends Command
 
         // 1. Fetch HTML
         $html = @file_get_contents($target);
-        if (!$html) {
+        if ($html === false || $html === '') {
             $io->error("Could not read target: $target");
             return Command::FAILURE;
         }

src/Console/Command/ScanCommand.php

@@ -16,7 +16,7 @@ use YakNet\AccessibilityConsole\Source\SourceLocator;
 
 class ScanCommand extends Command
 {
-    protected static $defaultName = 'scan';
+    protected static ?string $defaultName = 'scan';
 
     protected function configure(): void
     {
@@ -33,14 +33,22 @@ class ScanCommand extends Command
     {
         $io = new SymfonyStyle($input, $output);
         $target = $input->getArgument('target');
-        $enableAi = $input->getOption('ai');
-        $projectPath = $input->getOption('project-path') ?? getcwd();
+        if (!is_string($target)) {
+            $io->error("Target must be a string URL or file path.");
+            return Command::FAILURE;
+        }
+        $enableAi = (bool)$input->getOption('ai');
+        $projectPathOption = $input->getOption('project-path');
+        $projectPath = is_string($projectPathOption) ? $projectPathOption : getcwd();
+        if ($projectPath === false) {
+            $projectPath = '.';
+        }
 
         $io->title("Accessibility Console - Scanning: $target");
 
         // 1. Fetch HTML
         $html = @file_get_contents($target);
-        if (!$html) {
+        if ($html === false || $html === '') {
             $io->error("Could not read target: $target");
             return Command::FAILURE;
         }
@@ -97,7 +105,7 @@ class ScanCommand extends Command
 
         // Export Report
         $reportPath = $input->getOption('report');
-        if ($reportPath) {
+        if (is_string($reportPath) && $reportPath !== '') {
             $extension = pathinfo($reportPath, PATHINFO_EXTENSION);
             if ($extension === 'json') {
                 $data = array_map(fn($v) => $v->toArray(), $violations);

src/Core/AbstractRule.php

@@ -21,12 +21,21 @@ abstract class AbstractRule
 
     protected function createViolation(string $message, \DOMElement $element): Violation
     {
+        $doc = $element->ownerDocument;
+        $html = '';
+        if ($doc !== null) {
+            $htmlVal = $doc->saveHTML($element);
+            if (is_string($htmlVal)) {
+                $html = $htmlVal;
+            }
+        }
+
         return new Violation(
             ruleId: (new \ReflectionClass($this))->getShortName(),
             message: $message,
             severity: $this->getSeverity(),
             standard: $this->getStandard(),
-            htmlSnippet: $element->ownerDocument->saveHTML($element)
+            htmlSnippet: $html
         );
     }
 }

src/Core/Config.php

@@ -4,8 +4,12 @@ namespace YakNet\AccessibilityConsole\Core;
 
 class Config
 {
+    /** @var array<string, mixed> */
     private array $settings = [];
 
+    /**
+     * @param array<string, mixed> $settings
+     */
     public function __construct(array $settings = [])
     {
         $this->settings = $settings;

src/Core/RuleEngine.php

@@ -4,7 +4,7 @@ namespace YakNet\AccessibilityConsole\Core;
 
 class RuleEngine
 {
-    /** @var array */
+    /** @var array<int, mixed> */
     private array $rules = [];
 
     public function addRule(mixed $rule): void
@@ -19,22 +19,17 @@ class RuleEngine
     {
         $allViolations = [];
         foreach ($this->rules as $rule) {
-            if (method_exists($rule, 'check')) {
-                // Determine if it's a document-level rule or element-level rule
-                $reflection = new \ReflectionMethod($rule, 'check');
-                $params = $reflection->getParameters();
-                
-                $type = $params[0]->getType();
-                if (isset($params[0]) && $type instanceof \ReflectionNamedType && $type->getName() === 'DOMDocument') {
+            if ($rule instanceof AbstractRule) {
                 // Document-level rule (Core\AbstractRule style)
                 $violations = $rule->check($doc);
                 $allViolations = array_merge($allViolations, $violations);
-                } else {
+            } elseif ($rule instanceof \YakNet\AccessibilityConsole\Rules\RuleInterface) {
                 // Element-level rule (Rules\RuleInterface style)
-                    // We need to iterate over all elements
                 $xpath = new \DOMXPath($doc);
                 $elements = $xpath->query('//*');
+                if ($elements !== false) {
                     foreach ($elements as $element) {
+                        if ($element instanceof \DOMElement) {
                             $violation = $rule->check($element);
                             if ($violation) {
                                 $allViolations[] = $violation;
@@ -43,6 +38,7 @@ class RuleEngine
                     }
                 }
             }
+        }
         return $allViolations;
     }
 }

src/Core/Scanner.php

@@ -4,11 +4,11 @@ namespace YakNet\AccessibilityConsole\Core;
 
 class Scanner
 {
-    public function __construct(private ?RuleEngine $engine = null)
+    private RuleEngine $engine;
+
+    public function __construct(?RuleEngine $engine = null)
     {
-        if ($this->engine === null) {
-            $this->engine = new RuleEngine();
-        }
+        $this->engine = $engine ?? new RuleEngine();
     }
 
     public function addRule(mixed $rule): void

src/Core/Violation.php

@@ -4,6 +4,9 @@ namespace YakNet\AccessibilityConsole\Core;
 
 class Violation
 {
+    /**
+     * @param array{file: string, line: int}|null $location
+     */
     public function __construct(
         public string $ruleId,
         public string $message,
@@ -14,6 +17,9 @@ class Violation
         public ?string $fixSuggestion = null
     ) {}
 
+    /**
+     * @return array{ruleId: string, message: string, severity: string, standard: string, htmlSnippet: string, location: array{file: string, line: int}|null, fixSuggestion: string|null}
+     */
     public function toArray(): array
     {
         return [

src/Rules/AbstractRule.php

@@ -16,12 +16,21 @@ abstract class AbstractRule implements RuleInterface
 
     protected function createViolation(DOMElement $element, string $message, ?string $suggestion = null): Violation
     {
+        $doc = $element->ownerDocument;
+        $html = '';
+        if ($doc !== null) {
+            $htmlVal = $doc->saveHTML($element);
+            if (is_string($htmlVal)) {
+                $html = $htmlVal;
+            }
+        }
+
         return new Violation(
             ruleId: $this->getId(),
             message: $message,
             severity: $this->getSeverity(),
             standard: $this->getStandard(),
-            htmlSnippet: $element->ownerDocument->saveHTML($element),
+            htmlSnippet: $html,
             fixSuggestion: $suggestion
         );
     }

src/Rules/AriaRole.php

@@ -8,6 +8,7 @@ use YakNet\AccessibilityConsole\Core\WCAGStandard;
 
 class AriaRole extends AbstractRule
 {
+    /** @var array<int, string> */
     private static array $validRoles = [
         'alert', 'alertdialog', 'application', 'article', 'banner', 'button', 'cell', 'checkbox',
         'columnheader', 'combobox', 'complementary', 'contentinfo', 'definition', 'dialog', 'directory',
@@ -27,6 +28,7 @@ class AriaRole extends AbstractRule
         
         // 1. Check WAI-ARIA Role Validity
         $roleElements = $xpath->query('//*[@role]');
+        if ($roleElements !== false) {
             foreach ($roleElements as $el) {
                 if (!$el instanceof \DOMElement) {
                     continue;
@@ -45,9 +47,11 @@ class AriaRole extends AbstractRule
                     }
                 }
             }
+        }
 
         // 2. Check aria-controls Targets Existence
         $controlsElements = $xpath->query('//*[@aria-controls]');
+        if ($controlsElements !== false) {
             foreach ($controlsElements as $el) {
                 if (!$el instanceof \DOMElement) {
                     continue;
@@ -59,7 +63,7 @@ class AriaRole extends AbstractRule
                 $targets = array_filter(explode(' ', $targetsStr));
                 foreach ($targets as $targetId) {
                     $targetQuery = $xpath->query('//*[@id="' . $targetId . '"]');
-                if ($targetQuery->length === 0) {
+                    if ($targetQuery !== false && $targetQuery->length === 0) {
                         $violations[] = $this->createViolation(
                             "Attribute aria-controls=\"{$targetId}\" targets an element that does not exist in the document.",
                             $el
@@ -67,6 +71,7 @@ class AriaRole extends AbstractRule
                     }
                 }
             }
+        }
 
         return $violations;
     }

src/Rules/ColorContrast.php

@@ -92,18 +92,21 @@ class ColorContrast extends AbstractRule
         return null;
     }
 
+    /**
+     * @return array{0: int, 1: int, 2: int}|null
+     */
     private function hexToRgb(string $hex): ?array
     {
         $hex = ltrim($hex, '#');
         if (strlen($hex) === 3) {
-            $r = hexdec(substr($hex, 0, 1) . substr($hex, 0, 1));
-            $g = hexdec(substr($hex, 1, 1) . substr($hex, 1, 1));
-            $b = hexdec(substr($hex, 2, 1) . substr($hex, 2, 1));
+            $r = (int)hexdec(substr($hex, 0, 1) . substr($hex, 0, 1));
+            $g = (int)hexdec(substr($hex, 1, 1) . substr($hex, 1, 1));
+            $b = (int)hexdec(substr($hex, 2, 1) . substr($hex, 2, 1));
             return [$r, $g, $b];
         } elseif (strlen($hex) === 6) {
-            $r = hexdec(substr($hex, 0, 2));
-            $g = hexdec(substr($hex, 2, 2));
-            $b = hexdec(substr($hex, 4, 2));
+            $r = (int)hexdec(substr($hex, 0, 2));
+            $g = (int)hexdec(substr($hex, 2, 2));
+            $b = (int)hexdec(substr($hex, 4, 2));
             return [$r, $g, $b];
         }
         return null;

src/Rules/DuplicateId.php

@@ -13,6 +13,9 @@ class DuplicateId extends AbstractRule
         $violations = [];
         $xpath = new \DOMXPath($doc);
         $elements = $xpath->query('//*[@id]');
+        if ($elements === false) {
+            return [];
+        }
         
         $ids = [];
         foreach ($elements as $el) {

src/Rules/FormLabel.php

@@ -29,12 +29,15 @@ class FormLabel extends AbstractRule
 
         if ($element->hasAttribute('id')) {
             $id = $element->getAttribute('id');
-            $xpath = new \DOMXPath($element->ownerDocument);
+            $doc = $element->ownerDocument;
+            if ($doc !== null) {
+                $xpath = new \DOMXPath($doc);
                 $labels = $xpath->query("//label[@for='$id']");
-            if ($labels->length > 0) {
+                if ($labels !== false && $labels->length > 0) {
                     return null;
                 }
             }
+        }
 
         // Check for aria-label or aria-labelledby
         if ($element->hasAttribute('aria-label') || $element->hasAttribute('aria-labelledby')) {

src/Rules/HeadingOrderRule.php

@@ -13,6 +13,9 @@ class HeadingOrderRule extends AbstractRule
         $violations = [];
         $xpath = new \DOMXPath($doc);
         $headings = $xpath->query('//h1|//h2|//h3|//h4|//h5|//h6');
+        if ($headings === false) {
+            return [];
+        }
         
         $lastLevel = 0;
         foreach ($headings as $h) {

src/Rules/StandardRuleSet.php

@@ -9,7 +9,8 @@ class StandardRuleSet
      */
     public static function all(): array
     {
-        return [
+        /** @var RuleInterface[] $rules */
+        $rules = [
             new HtmlHasLang(),
             new ImgAltText(),
             new EmptyLink(),
@@ -24,5 +25,6 @@ class StandardRuleSet
             new AriaRole(),
             new IframeTitle(),
         ];
+        return $rules;
     }
 }

src/Source/SourceLocator.php

@@ -8,19 +8,24 @@ use SplFileInfo;
 
 class SourceLocator
 {
+    /** @var array<int, string> */
     private array $extensions = ['php', 'html', 'twig', 'blade.php'];
 
     public function __construct(
         private readonly string $searchPath
     ) {}
 
+    /**
+     * @return array{file: string, line: int}|null
+     */
     public function locate(string $snippet): ?array
     {
         if (!is_dir($this->searchPath) || !is_readable($this->searchPath)) {
             return null;
         }
 
-        $cleanSnippet = trim(preg_replace('/\s+/', ' ', $snippet));
+        $replaced = preg_replace('/\s+/', ' ', $snippet);
+        $cleanSnippet = is_string($replaced) ? trim($replaced) : '';
         if ($cleanSnippet === '') {
             return null;
         }
@@ -76,6 +81,9 @@ class SourceLocator
         return false;
     }
 
+    /**
+     * @return array{type: 'exact', location: array{file: string, line: int}}|array{type: 'fuzzy', score: float, location: array{file: string, line: int}}|array{type: 'none'}
+     */
     private function searchInFile(string $filepath, string $searchSnippet, string $fullSnippet): array
     {
         $content = file_get_contents($filepath);
@@ -91,7 +99,8 @@ class SourceLocator
 
         foreach ($lines as $index => $line) {
             $lineNumber = $index + 1;
-            $cleanLine = trim(preg_replace('/\s+/', ' ', $line));
+            $replacedLine = preg_replace('/\s+/', ' ', $line);
+            $cleanLine = is_string($replacedLine) ? trim($replacedLine) : '';
 
             if (str_contains($cleanLine, $searchSnippet)) {
                 return [
@@ -118,6 +127,9 @@ class SourceLocator
         return ['type' => 'none'];
     }
 
+    /**
+     * @return array{tag: string|null, attributes: array<string, string>}
+     */
     private function parseSnippet(string $snippet): array
     {
         preg_match('/<([a-zA-Z0-9]+)/', $snippet, $matches);
@@ -133,6 +145,9 @@ class SourceLocator
         return ['tag' => $tagName, 'attributes' => $attributes];
     }
 
+    /**
+     * @param array{tag: string|null, attributes: array<string, string>} $parsed
+     */
     private function calculateFuzzyScore(string $line, array $parsed): float
     {
         if (!$parsed['tag'] || !str_contains(strtolower($line), '<' . strtolower($parsed['tag']))) {