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wp-content/plugins/debloat/inc/delay-load/delay-load.php

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+<?php
+
+namespace Sphere\Debloat;
+
+use Sphere\Debloat\OptimizeCss\Stylesheet;
+use Sphere\Debloat\OptimizeJs\Script;
+
+/**
+ * Delay load assets singleton.
+ * 
+ * @author  asadkn
+ * @since   1.0.0
+ */
+class DelayLoad
+{
+	public $enabled = true;
+	public $use_js = false;
+	public $js_type;
+
+	public $preload = [];
+	
+	/**
+	 * Note: Should be used a singleton.
+	 */
+	public function __construct()
+	{
+		$this->register_hooks();
+	}
+
+	public function register_hooks()
+	{
+		// add_action('wp_enqueue_scripts', [$this, 'register_assets']);
+	}
+
+	/**
+	 * Enable injection of required scripts and preloads, as needed. 
+	 *
+	 * @param null|true $use_js Whether to inject delay/defer JS. null keeps the current.
+	 * @return void
+	 */
+	public function enable($use_js = null)
+	{
+		$this->enabled = true;
+
+        if ($use_js === true) {
+            $this->use_js = $use_js;
+        }
+	}
+
+	public function disable()
+	{
+		$this->enabled = false;
+	}
+
+	/**
+	 * Enqueue a preload.
+	 *
+	 * @param Stylesheet|Script $asset
+	 * @return void
+	 */
+	public function add_preload($asset)
+	{
+		$this->preload[] = $asset;
+	}
+
+	/**
+	 * Add extras to the provided HTML buffer.
+	 *
+	 * @param string $html
+	 * @return string
+	 */
+	public function render($html)
+	{
+		if (!$this->enabled) {
+			return $html;
+		}
+
+		$js = $this->render_js();
+		$preloads = $this->render_preloads();
+
+		$append = $preloads . $js;
+
+		// Add to body or at the end.
+		// Note: Has to be at the end to ensure all <script> tags with defer has been added.
+		if (strpos($html, '</body>') !== false) {
+			$html = str_replace('</body>', $append . "\n</body>", $html);
+		} else {
+			$html .=  $append;
+		}
+
+
+		return $html;
+	}
+
+	protected function render_preloads()
+	{
+		$preloads = [];
+		foreach ($this->preload as $preload) {
+			$media = 'all';
+			$type  = ($preload instanceof Stylesheet) ? 'style' : 'script';
+
+			if ($type === 'style') {
+				$media = $preload->media ?: $media;
+			}
+
+			$preloads[] = sprintf(
+				'<link rel="prefetch" href="%1$s" as="%2$s" media="%3$s" />',
+				esc_url($preload->get_content_url()),
+				$type,
+				esc_attr($media)
+			);
+		}
+
+		return implode('', $preloads);
+	}
+
+	/**
+	 * Get JS enqueues and inline scripts as needed.
+	 *
+	 * @return string
+	 */
+	protected function render_js()
+	{
+		if (!$this->use_js) {
+			return '';
+		}
+
+		$js  = '';
+		$min = Plugin::get_instance()->env !== 'dev' ? '.min' : '';
+
+		// Defer JS is always inline.
+		$js .= sprintf(
+			'<script data-cfasync="false">%s</script>',
+			Plugin::file_system()->get_contents(
+				Plugin::get_instance()->dir_path . 'inc/delay-load/js/defer-load'. $min .'.js'
+			)
+		);
+
+		// Delay load JS comes after, just in case, to not mess up readyState.
+		if ($this->js_type === 'inline') {
+			$js .= sprintf(
+				'<script data-cfasync="false">%s</script>',
+				Plugin::file_system()->get_contents(
+					Plugin::get_instance()->dir_path . 'inc/delay-load/js/delay-load'. $min .'.js'
+				)
+			);
+
+		} else {
+
+			$js .= sprintf(
+				'<script type="text/javascript" src="%s" data-cfasync="false"></script>',
+				esc_url(Plugin::get_instance()->dir_url . 'inc/delay-load/js/delay-load'. $min .'.js?ver=' . Plugin::VERSION)
+			);
+		}
+
+		if (!$js) {
+			return '';
+		}
+
+		/**
+		 * Add configs.
+		 */
+		$configs = [
+			'cssDelayType' => Plugin::options()->delay_css_type,
+			'jsDelayType'  => Plugin::options()->delay_js_type,
+			'jsDelayMax'   => Plugin::options()->delay_js_max
+		];
+
+		$js = sprintf(
+			'<script>var debloatConfig = %1$s;</script>%2$s',
+			json_encode($configs),
+			$js
+		);
+
+		return $js;
+	}
+	
+	/**
+	 * Check for conditionals for delay load.
+	 *
+	 * @return boolean
+	 */
+	public function should_delay_css()
+	{
+		if (!Plugin::options()->delay_css_load) {
+			return false;
+		}
+
+		$valid = Plugin::process()->check_enabled(Plugin::options()->delay_css_on);
+
+		return apply_filters('debloat/should_delay_css', $valid);
+	}
+}