Dom Laravel Package

Getting Started

Minimal Setup

1. Installation:

   composer require phpgt/dom
   

   No additional configuration is required—just autoload via Composer.

2. First Use Case: Parse and manipulate HTML/XML with a modern, chainable API:

   use Phpgt\Dom\Document;
   
   $html = '<div class="container"><h1>Hello</h1><p>World</p></div>';
   $dom = Document::loadHtml($html);
   
   // Query and modify
   $dom->query('h1')->setText('Updated Title');
   echo $dom->saveHtml();
   

3. Key Entry Points:

   • Document::loadHtml() / Document::loadXml() – Parse strings or files.
   • $dom->query() – Select elements (CSS selectors or XPath).
   • $element->setAttribute() / $element->remove() – Modify structure/content.

Implementation Patterns

Common Workflows

1. Scraping & Data Extraction:

   $dom = Document::loadHtml(file_get_contents('https://example.com'));
   $titles = $dom->query('article h2')->map(fn($el) => $el->textContent);
   

2. Dynamic HTML Generation:

   $dom = new Document();
   $dom->appendChild($dom->createElement('div'))
       ->setAttribute('id', 'dynamic-content')
       ->appendChild($dom->createTextNode('Dynamic!'));
   

3. Integration with Laravel:

   • Blade Templates: Use Document to pre-process HTML before rendering:

     $dom = Document::loadHtml(view('partials.header')->render());
     $dom->query('.logo')->setAttribute('src', asset('new-logo.png'));
     echo $dom->saveHtml();
     

   • Form Handling: Sanitize/modify user-submitted HTML:

     $cleaned = Document::loadHtml($request->input('html_content'))
         ->query('script')->remove()
         ->saveHtml();
     

4. Testing:

   $this->assertEquals(
       '<div>Test</div>',
       Document::loadHtml('<div>Test</div>')->saveHtml()
   );
   

Performance Tips

• Reuse Documents: Instantiate once and reuse for multiple operations.
• Batch Queries: Chain queries to avoid repeated parsing:

  $dom->query('.item')->each(fn($el) => $el->setAttribute('data-id', $el->id));
  

Gotchas and Tips

Pitfalls

1. XPath vs. CSS Selectors:

   • CSS selectors (e.g., query('div > p')) are faster but less powerful than XPath.
   • Use XPath for complex queries (e.g., query('//div[@class="nested"]//a')).

2. Namespace Handling:

   • XML namespaces require explicit declaration:

     $dom = Document::loadXml('<svg xmlns="http://www.w3.org/2000/svg">...</svg>');
     $dom->registerNamespace('svg', 'http://www.w3.org/2000/svg');
     $dom->query('svg|circle')->remove();
     

3. HTML5 Quirks:

   • Self-closing tags (e.g., <img />) may render differently in saveHtml(). Use:

     $dom->setFormatOutput(true); // Pretty-print with proper tag closing.
     

4. Memory Usage:

   • Large documents (e.g., 10MB+) may cause high memory usage. Stream parsing with DOMDocument::loadHTMLFile() (native) as a fallback.

Debugging

• Inspect Elements:

  $dom->query('body')->each(fn($el) => dump($el->outerHTML));
  

• Validate XML:

  $dom->validate(); // Throws exception on malformed XML.
  

Extension Points

1. Custom Elements: Extend Phpgt\Dom\Element for domain-specific methods:

   class ArticleElement extends Element {
       public function getTitle(): string {
           return $this->query('h1')->textContent;
       }
   }
   

2. Event Listeners: Hook into DOM events (e.g., post-load) via traits or decorators.

3. Integration with Guzzle: Combine with HTTP clients for headless scraping:

   $html = $client->request('GET', $url)->getBody();
   $dom = Document::loadHtml($html);
   

Configuration Quirks

• Default Doctype: Document::loadHtml() auto-detects HTML5; force a doctype with:

  $dom = new Document();
  $dom->appendChild($dom->createProcessingInstruction('xml', 'version="1.0"'));