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<?php |
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/* |
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* This file is part of the TWIG-YALL package. |
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* |
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* (c) Jitendra Adhikari <[email protected]> |
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* <https://github.com/adhocore> |
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* |
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* Licensed under MIT license. |
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*/ |
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namespace Ahc\TwigYall; |
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use Twig\Node\Node; |
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use Twig\Node\TextNode; |
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use Twig\Token; |
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use Twig\TokenParser\AbstractTokenParser; |
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class Parser extends AbstractTokenParser |
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{ |
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/** @var string yall lazyClass */ |
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protected $lazyClass; |
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/** @var string URI for placeholder image */ |
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protected $placeholder; |
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/** |
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* Constructor. |
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* |
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* @param string $lazyClass |
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* @param string $placeholder |
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*/ |
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public function __construct(string $lazyClass, string $placeholder) |
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{ |
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$this->lazyClass = $lazyClass; |
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$this->placeholder = $placeholder; |
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} |
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/** |
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* Parse `{% lazyload %}...{% endlazyload %}` block. |
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* |
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* @param Token $token |
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* |
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* @return Node |
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*/ |
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public function parse(Token $token): Node |
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{ |
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$stream = $this->parser->getStream(); |
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$stream->expect(Token::BLOCK_END_TYPE); |
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$body = $this->parser->subparse([$this, 'isLazyloadEnd'], true); |
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$stream->expect(Token::BLOCK_END_TYPE); |
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return $this->traverse($body); |
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} |
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protected function traverse(Node $node) |
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{ |
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if ($node instanceof TextNode) { |
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$node->setAttribute('data', $this->doLazyload($node->getAttribute('data'))); |
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} |
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foreach ($node as $sub) { |
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$this->traverse($sub); |
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} |
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return $node; |
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} |
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protected function doLazyload(string $html): string |
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{ |
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return \preg_replace_callback('/<(img|source|video)([^>]+)>/m', function ($match) { |
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list($all, $tag, $props) = $match; |
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if (empty(\trim($props, ' /')) || \strpos($props, "no-{$this->lazyClass}") !== false) { |
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return $all; |
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} |
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// Already there |
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if (\preg_match('/data-(src|poster)/i', $props)) { |
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return $all; |
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} |
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$needsSrc = $this->needsSrc($tag, $props); |
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if (\stripos($props, ' class') === false) { |
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$tag .= " class=\"{$this->lazyClass} yall\""; |
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} |
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if (\stripos($props, ' poster') !== false) { |
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$tag .= " poster=\"{$this->placeholder}\""; |
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} |
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$src = $needsSrc ? " src=\"{$this->placeholder}\"" : ''; |
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return "<$tag$src" . $this->doReplacements($props) . '>'; |
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}, $html); |
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} |
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protected function needsSrc(string $tag, string $props): bool |
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{ |
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// For source no need src, for video no need src if not already there! |
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if ($tag === 'source') { |
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return false; |
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} |
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return $tag !== 'video' || \stripos($props, 'src') !== false; |
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} |
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protected function doReplacements(string $props): string |
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{ |
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$replacements = [ |
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' src=' => ' data-src=', |
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' src =' => ' data-src=', |
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' srcset=' => ' data-srcset=', |
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' srcset =' => ' data-srcset=', |
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' class="' => " class=\"{$this->lazyClass} yall ", |
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' class ="' => " class=\"{$this->lazyClass} yall ", |
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' class = "' => " class=\"{$this->lazyClass} yall ", |
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" class='" => " class='{$this->lazyClass} yall ", |
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" class ='" => " class='{$this->lazyClass} yall ", |
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" class = '" => " class='{$this->lazyClass} yall ", |
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' poster=' => ' data-poster=', |
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' poster =' => ' data-poster=', |
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]; |
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return \strtr($props, $replacements); |
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} |
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/** |
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* @internal |
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*/ |
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public function isLazyloadEnd(Token $token): bool |
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{ |
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return $token->test('endlazyload'); |
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} |
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/** |
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* Gets the tag name used in block. |
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* |
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* @return string |
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*/ |
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public function getTag(): string |
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{ |
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return 'lazyload'; |
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} |
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} |
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adhocore /
twig-yall
