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wp-content/plugins/smart-slider-3/Nextend/Framework/WordPress/AssetInjector.php

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+<?php
+
+
+namespace Nextend\Framework\WordPress;
+
+
+use Nextend\Framework\Asset\AssetManager;
+use Nextend\Framework\Pattern\SingletonTrait;
+use Nextend\WordPress\OutputBuffer;
+
+class AssetInjector {
+
+    use SingletonTrait;
+
+    private static $cssComment = '<!--n2css-->';
+
+    protected $js = '';
+    protected $css = '';
+
+    /**
+     * @var OutputBuffer
+     */
+    protected $outputBuffer;
+
+    private $headTokens = array();
+
+    private $useAlternativeAction = false;
+
+    protected function init() {
+        if (is_admin()) {
+            $this->useAlternativeAction = true;
+        }
+
+
+        if (defined('WP_CLI') && WP_CLI) {
+            //Do not start output buffering while WP_CLI active
+
+        } else {
+
+            $this->outputBuffer = OutputBuffer::getInstance();
+            if (defined('SMART_SLIDER_OB_START') && SMART_SLIDER_OB_START >= 0) {
+                $this->outputBuffer->setExtraObStart(SMART_SLIDER_OB_START);
+            }
+
+            $this->addInjectCSSComment();
+
+            add_filter('wordpress_prepare_output', array(
+                $this,
+                'prepareOutput'
+            ));
+        }
+    }
+
+    public function prepareOutput($buffer) {
+        static $once = false;
+        if (!$once) {
+            $once = true;
+            $this->finalizeCssJs();
+
+            if (!empty($this->css)) {
+                $n2cssPos = strpos($buffer, self::$cssComment);
+                if ($n2cssPos !== false) {
+                    $buffer    = substr_replace($buffer, $this->css, $n2cssPos, strlen(self::$cssComment));
+                    $this->css = '';
+                } else {
+                    $parts = preg_split('/<\/head[\s]*>/i', $buffer, 2);
+                    // There might be no head and it would result a notice.
+                    if (count($parts) == 2) {
+                        list($head, $body) = $parts;
+                        /**
+                         * We must tokenize the HTML comments in the head to prepare for condition CSS/scripts
+                         * Eg.: <!--[if lt IE 9]><link rel='stylesheet' href='ie8.css?ver=1.0' type='text/css' media='all'> <![endif]-->
+                         */
+                        $head = preg_replace_callback('/<!--.*?-->/s', array(
+                            $this,
+                            'tokenizeHead'
+                        ), $head);
+
+                        $head = preg_replace_callback('/<noscript>.*?<\/noscript>/s', array(
+                            $this,
+                            'tokenizeHead'
+                        ), $head);
+
+                        $lastStylesheetPosition = strrpos($head, "<link rel='stylesheet'");
+                        if ($lastStylesheetPosition === false) {
+                            $lastStylesheetPosition = strrpos($head, "<link rel=\"stylesheet\"");
+                            if ($lastStylesheetPosition === false) {
+                                $lastStylesheetPosition = strrpos($head, "<link");
+                            }
+                        }
+                        if ($lastStylesheetPosition !== false) {
+
+                            /**
+                             * Find the end of the tag <link tag
+                             */
+                            $lastStylesheetPositionEnd = strpos($head, ">", $lastStylesheetPosition);
+                            if ($lastStylesheetPositionEnd !== false) {
+
+                                /**
+                                 * Insert CSS after the ending >
+                                 */
+                                $head      = substr_replace($head, $this->css, $lastStylesheetPositionEnd + 1, 0);
+                                $this->css = '';
+
+                                /**
+                                 * Restore HTML comments
+                                 */
+                                $head = preg_replace_callback('/<!--TOKEN([0-9]+)-->/', array(
+                                    $this,
+                                    'restoreHeadTokens'
+                                ), $head);
+
+                                $buffer = $head . '</head>' . $body;
+                            }
+
+                        }
+                    }
+                }
+            }
+
+            if ($this->css != '' || $this->js != '') {
+                $parts = preg_split('/<\/head[\s]*>/', $buffer, 2);
+
+                return implode($this->css . $this->js . '</head>', $parts);
+            }
+        }
+
+        return $buffer;
+    }
+
+    public function tokenizeHead($matches) {
+
+        $index = count($this->headTokens);
+
+        $this->headTokens[$index] = $matches[0];
+
+        return '<!--TOKEN' . $index . '-->';
+    }
+
+    public function restoreHeadTokens($matches) {
+
+        return $this->headTokens[$matches[1]];
+    }
+
+    private function finalizeCssJs() {
+        static $finalized = false;
+        if (!$finalized) {
+            $finalized = true;
+
+            if (class_exists('\\Nextend\\Framework\\Asset\\AssetManager', false)) {
+                $this->css = AssetManager::getCSS();
+                $this->js  = AssetManager::getJs();
+            }
+        }
+
+        return true;
+    }
+
+    public function addInjectCSSComment() {
+        if (!$this->useAlternativeAction) {
+            add_action('wp_print_scripts', array(
+                $this,
+                'injectCSSComment'
+            ));
+        } else {
+            /**
+             * @see SSDEV-3909
+             * The Site editor fires the wp_print_scripts action inside a the wp.editSite.initializeEditor script.
+             * The Widgets editor fires the wp_print_scripts action inside a the wp.editWidgets.initialize script.
+             * The Customizer fires the wp_print_scripts action inside a the wp.customizeWidgets.initialize script.
+             */
+            add_action('admin_head', array(
+                $this,
+                'injectCSSComment'
+            ));
+        }
+    }
+
+    public function removeInjectCSSComment() {
+        if (!$this->useAlternativeAction) {
+            remove_action('wp_print_scripts', array(
+                $this,
+                'injectCSSComment'
+            ));
+        } else {
+            /**
+             * @see SSDEV-3909
+             * The Site editor fires the wp_print_scripts action inside a the wp.editSite.initializeEditor script.
+             * The Widgets editor fires the wp_print_scripts action inside a the wp.editWidgets.initialize script.
+             * The Customizer fires the wp_print_scripts action inside a the wp.customizeWidgets.initialize script.
+             */
+            remove_action('admin_head', array(
+                $this,
+                'injectCSSComment'
+            ));
+        }
+    }
+
+    public function injectCSSComment() {
+        static $once;
+        if (!$once) {
+            echo wp_kses(self::$cssComment, array());
+            $once = true;
+        }
+    }
+}