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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\Extension\AbstractExtension; |
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use Twig\Markup; |
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use Twig\TwigFunction; |
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class Yall extends AbstractExtension |
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{ |
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/** @var array Configuration */ |
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protected $config = []; |
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/** |
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* Constructor |
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* |
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* @param array $config Optinal configuration |
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*/ |
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public function __construct(array $config = []) |
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{ |
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$this->config = $config + [ |
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'polyfillJs' => 'https://polyfill.io/%s/polyfill.min.js?features=IntersectionObserver', |
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// @see: https://stackoverflow.com/a/15960901 |
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'placeholder' => 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEAAAAALAAAAAABAAEAAAI=', |
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'yallJs' => 'https://unpkg.com/yall-js@%s/dist/yall.min.js', |
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'lazyClass' => 'lazy', |
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]; |
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} |
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/** |
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* Get twig functions defined by this extension. |
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* |
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* @return array |
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*/ |
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public function getFunctions(): array |
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{ |
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return [ |
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new TwigFunction('lazify', [$this, 'lazify']), |
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new TwigFunction('yallify', [$this, 'yallify']), |
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]; |
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} |
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/** |
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* Get token parsers defined by this extension. |
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* |
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* @return array |
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*/ |
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public function getTokenParsers(): array |
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{ |
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return [new Parser($this->config['lazyClass'], $this->config['placeholder'])]; |
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} |
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/** |
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* Loads yall and polyfill scripts then triggers lazy loading. |
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* |
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* @param string|null $yall Yall version |
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* @param string|null $polyfill Polyfill version ('' = off) |
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* @param array $options Options for `yall({})` callback |
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* |
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* @return Markup |
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*/ |
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public function yallify(string $yall = null, string $polyfill = null, array $options = []): Markup |
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{ |
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$yallJs = \sprintf($this->config['yallJs'], $yall ?: '3.1.7'); |
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$options += ['lazyClass' => $this->config['lazyClass']]; |
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$jsonFlag = \JSON_UNESCAPED_SLASHES | \JSON_FORCE_OBJECT; |
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$jsonOpts = \json_encode($options, $jsonFlag); |
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$jsonOpts = \str_replace(['"<raw>', '</raw>"'], ['', ''], $jsonOpts); |
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$markup = [ |
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$polyfill ?? 'v2' |
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? \sprintf('<script src="%s" async></script>', \sprintf($this->config['polyfillJs'], $polyfill ?? 'v2')) |
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: '', |
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\sprintf('<script src="%s" async></script>', $yallJs), |
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'<script type="text/javascript">', |
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'document.addEventListener("DOMContentLoaded", function() {', |
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\sprintf(' window.setTimeout(function () { yall(%s); }, 99);', $jsonOpts), |
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'});', |
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'</script>', |
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]; |
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return new Markup(\implode("\n", $markup), 'UTF-8'); |
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} |
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/** |
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* Lazify resources. |
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* |
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* @param string|string[] $src The sources to lazy load |
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* @param string $classes The optional element classes |
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* @param string $dummy The optional placeholder image |
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* |
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* @return Markup |
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*/ |
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public function lazify($src, string $classes = '', string $dummy = ''): Markup |
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{ |
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$attr = 'src'; |
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if (\is_array($src)) { |
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list($attr, $src) = $this->normalizeSrc($src); |
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} |
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$classes = \trim("$classes {$this->config['lazyClass']} yall"); |
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if ('srcset' !== $attr) { |
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$dummy = \sprintf(' %s="%s"', $attr, $dummy ?: $this->config['placeholder']); |
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} |
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$markup = \sprintf('class="%s"%s data-%s="%s"', $classes, $dummy, $attr, $src); |
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return new Markup($markup, 'UTF-8'); |
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} |
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protected function normalizeSrc(array $src): array |
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{ |
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if ($src['poster'] ?? false) { |
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return ['poster', $src['poster']]; |
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} |
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if ($src['srcset'] ?? false) { |
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return ['srcset', $src['srcset']]; |
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} |
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$srcset = $src; |
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$src = \array_shift($srcset); |
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return ['src', $src . '" data-srcset="' . \implode(', ', $srcset)]; |
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} |
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} |
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adhocore /
twig-yall
