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<?php |
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|
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namespace Getwid; |
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|
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class AssetsOptimization { |
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|
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/** |
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* @var AssetsOptimization |
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*/ |
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private static $instance = null; |
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|
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/** |
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* Flag to indicate if CSS is already minified |
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* |
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* @var bool |
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*/ |
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private $alreadyoptimized = false; |
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|
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/** |
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* @return AssetsOptimization |
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*/ |
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public static function getInstance() { |
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if ( is_null( self::$instance ) ) { |
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self::$instance = new self(); |
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} |
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|
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return self::$instance; |
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} |
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|
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/** |
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* AssetsOptimization constructor. |
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*/ |
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public function __construct() { |
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|
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getwid_maybe_add_option( 'getwid_load_assets_on_demand', false, true ); |
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getwid_maybe_add_option( 'getwid_move_css_to_head', false, true ); |
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|
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if ( FALSE == $this->load_assets_on_demand() || |
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FALSE == $this->move_css_to_head() ) { |
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return; |
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} |
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|
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add_action( 'template_redirect', array( $this, 'buffer_start' ), 1 ); |
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|
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add_filter( 'getwid/html/output', array( $this, 'filter_css' ) ); |
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add_filter( 'getwid/html/output', array( $this, 'filter_test' ) ); |
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|
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// Filter Autoptimize plugin output |
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add_filter( 'autoptimize_filter_html_before_minify', array( $this, 'filter_css' ) ); |
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|
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} |
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|
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/** |
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* Setup output buffering if needed. |
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* |
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* @return void |
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*/ |
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public function buffer_start() { |
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|
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if ( $this->should_buffer() ) { |
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ob_start( array( $this, 'buffer_end' ) ); |
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} |
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} |
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|
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/** |
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* Processes/optimizes the output-buffered content and returns it. |
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* If the content is not processable, it is returned unmodified. |
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* |
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* @param string $html Buffered content. |
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* |
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* @return string |
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*/ |
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public function buffer_end( $html ) { |
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|
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// Bail early without modifying anything if we can't handle the content. |
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if ( ! $this->is_valid_buffer( $html ) ) { |
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return $html; |
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} |
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|
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// Apply any filters to the final output |
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$html = apply_filters( 'getwid/html/output', $html ); |
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|
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return $html; |
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} |
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|
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/* |
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* Test replacement |
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* |
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* @param string $html Buffered content. |
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* |
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* @return string |
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*/ |
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public function filter_test( $html ) { |
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|
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if ( $this->alreadyoptimized ) { |
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$html .= PHP_EOL . '<!-- getwid optimized -->'; |
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} |
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|
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return $html; |
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} |
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|
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/* |
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* Find stylesheets of our blocks in original HTML and move them to Header |
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* |
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* @param string $html Buffered content. |
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* |
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* @return string |
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* |
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* Source \plugins\autoptimize\classes\autoptimizeStyles.php |
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*/ |
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public function filter_css( $html ) { |
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|
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if ( $this->alreadyoptimized ) { |
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return $html; |
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} |
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|
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$css = array(); |
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|
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$blocks = getwid()->blocksManager()->getBlocks(); |
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//var_dump($blocks);exit; |
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|
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$optimize_more = apply_filters( 'getwid/optimize/assets', [] ); |
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|
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/* |
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* Blocks array example: |
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* ["getwid/anchor"] => object(Getwid\Blocks\Anchor) {} |
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* |
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* Style tag example: |
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* <link rel='stylesheet' id='getwid/banner-css' href='https://.../wp-content/plugins/getwid/assets/blocks/banner/style.css' type='text/css' media='all' /> |
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*/ |
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|
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// Find stylesheets in original html |
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if ( preg_match_all( '#(<link[^>]*stylesheet[^>]*>)#Usmi', $html, $tag_matches ) ) { |
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|
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foreach ( $tag_matches[0] as $tag ) { |
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|
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if ( preg_match( '#<link.*id=("|\')(.*)-css("|\')#Usmi', $tag, $link_matches ) ) { |
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|
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$link_id = $link_matches[2]; |
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//var_dump($link_id); |
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|
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// Check if this is a stylesheet of our block |
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if ( |
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array_key_exists( $link_id, $blocks ) || |
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in_array( $link_id, $optimize_more ) |
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) { |
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//var_dump($link_id); |
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|
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// Save tag for next steps |
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$css[ $link_id ] = $tag; |
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|
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// Clear tag in original html |
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$html = str_replace( $tag, '<!-- #' . $link_id .' -->', $html ); |
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} |
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} |
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} |
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} |
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|
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// Process stylesheets if we found ones |
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if ( ! empty( $css ) ) { |
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|
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// move stylesheet to a new positon |
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$replace_tag = array( '</title>', 'after' ); |
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|
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// Debug |
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$css_scope = PHP_EOL . '<!-- getwid styles -->' . PHP_EOL . "\t"; |
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|
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// Print stylesheets |
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$css_scope .= implode( PHP_EOL . "\t", $css ); |
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|
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// Debug |
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$css_scope .= PHP_EOL . '<!-- /getwid styles -->' . PHP_EOL; |
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|
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//var_dump($css_scope);exit; |
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$html = $this->inject_in_html( $css_scope, $replace_tag, $html ); |
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|
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// Mark as optimized |
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$this->alreadyoptimized = true; |
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} |
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|
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return $html; |
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} |
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|
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/** |
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* Injects/replaces the given payload markup into `$html` |
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* at the specified location. |
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* If the specified tag cannot be found, the payload is appended into |
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* $html along with a warning wrapped inside <!--noptimize--> tags. |
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* |
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* @param string $payload Markup to inject. |
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* @param array $where Array specifying the tag name and method of injection. |
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* Index 0 is the tag name (i.e., `</body>`). |
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* Index 1 specifies ?'before', 'after' or 'replace'. Defaults to 'before'. |
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* |
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* @return void |
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*/ |
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protected function inject_in_html( $payload, $where, $html ) |
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{ |
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$warned = false; |
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$position = $this->strpos( $html, $where[0] ); |
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if ( false !== $position ) { |
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// Found the tag, setup content/injection as specified. |
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if ( 'after' === $where[1] ) { |
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$content = $where[0] . $payload; |
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} elseif ( 'replace' === $where[1] ) { |
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$content = $payload; |
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} else { |
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$content = $payload . $where[0]; |
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} |
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// Place where specified. |
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$html = $this->substr_replace( |
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$html, |
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$content, |
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$position, |
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// Using plain strlen() should be safe here for now, since |
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// we're not searching for multibyte chars here still... |
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strlen( $where[0] ) |
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); |
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} else { |
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// Couldn't find what was specified, just append and add a warning. |
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$html .= $payload; |
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if ( ! $warned ) { |
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$tag_display = str_replace( array( '<', '>' ), '', $where[0] ); |
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$html .= '<!--noptimize--><!-- We found a problem with the HTML in your Theme, tag `' . $tag_display . '` missing --><!--/noptimize-->'; |
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$warned = true; |
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} |
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} |
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|
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return $html; |
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} |
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|
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/** |
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* Returns true if all the conditions to start output buffering are satisfied. |
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* |
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* @return bool |
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*/ |
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public function should_buffer() { |
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|
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$do_buffering = false; |
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|
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// Check for site being previewed in the Customizer (available since WP 4.0). |
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$is_customize_preview = false; |
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if ( function_exists( 'is_customize_preview' ) && is_customize_preview() ) { |
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$is_customize_preview = is_customize_preview(); |
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} |
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|
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/** |
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* We only buffer the frontend requests (and then only if not a feed |
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* and not turned off explicitly and not when being previewed in Customizer)! |
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*/ |
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$do_buffering = ( ! is_admin() && ! is_feed() && ! is_embed() && ! $is_customize_preview ); |
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|
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return $do_buffering; |
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} |
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|
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/** |
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* Returns true if given markup is considered valid/processable/optimizable. |
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* |
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* @param string $content Markup. |
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* |
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* @return bool |
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*/ |
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public function is_valid_buffer( $content ) |
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{ |
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// Defaults to true. |
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$valid = true; |
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|
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return $valid; |
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} |
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|
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/** |
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* Multibyte-capable strpos() if support is available on the server. |
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* If not, it falls back to using \strpos(). |
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* |
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* @param string $haystack Haystack. |
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* @param string $needle Needle. |
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* @param int $offset Offset. |
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* @param string|null $encoding Encoding. Default null. |
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* |
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* @return int|false |
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*/ |
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public function strpos( $haystack, $needle, $offset = 0, $encoding = null ) |
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{ |
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if ( $this->mbstring_available() ) { |
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return ( null === $encoding ) ? \mb_strpos( $haystack, $needle, $offset ) : \mb_strpos( $haystack, $needle, $offset, $encoding ); |
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} else { |
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return \strpos( $haystack, $needle, $offset ); |
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} |
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} |
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|
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/** |
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* Our wrapper around implementations of \substr_replace() |
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* that attempts to not break things horribly if at all possible. |
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* Uses mbstring if available, before falling back to regular |
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* substr_replace() (which works just fine in the majority of cases). |
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* |
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* @param string $string String. |
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* @param string $replacement Replacement. |
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* @param int $start Start offset. |
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* @param int|null $length Length. |
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* @param string|null $encoding Encoding. |
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* |
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* @return string |
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*/ |
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public function substr_replace( $string, $replacement, $start, $length = null, $encoding = null ) |
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{ |
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if ( $this->mbstring_available() ) { |
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$strlen = $this->strlen( $string, $encoding ); |
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|
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if ( $start < 0 ) { |
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if ( -$start < $strlen ) { |
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$start = $strlen + $start; |
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} else { |
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$start = 0; |
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} |
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} elseif ( $start > $strlen ) { |
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$start = $strlen; |
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} |
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|
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if ( null === $length || '' === $length ) { |
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$start2 = $strlen; |
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} elseif ( $length < 0 ) { |
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$start2 = $strlen + $length; |
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if ( $start2 < $start ) { |
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$start2 = $start; |
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} |
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} else { |
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$start2 = $start + $length; |
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} |
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|
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if ( null === $encoding ) { |
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$leader = $start ? \mb_substr( $string, 0, $start ) : ''; |
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$trailer = ( $start2 < $strlen ) ? \mb_substr( $string, $start2, null ) : ''; |
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} else { |
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$leader = $start ? \mb_substr( $string, 0, $start, $encoding ) : ''; |
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$trailer = ( $start2 < $strlen ) ? \mb_substr( $string, $start2, null, $encoding ) : ''; |
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} |
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|
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return "{$leader}{$replacement}{$trailer}"; |
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} |
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|
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return ( null === $length ) ? \substr_replace( $string, $replacement, $start ) : \substr_replace( $string, $replacement, $start, $length ); |
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} |
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|
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/** |
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* Attempts to return the number of characters in the given $string if |
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* mbstring is available. Returns the number of bytes |
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* (instead of characters) as fallback. |
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* |
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* @param string $string String. |
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* @param string|null $encoding Encoding. |
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* |
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* @return int Number of characters or bytes in given $string |
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* (characters if/when supported, bytes otherwise). |
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*/ |
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public function strlen( $string, $encoding = null ) |
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{ |
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if ( $this->mbstring_available() ) { |
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return ( null === $encoding ) ? \mb_strlen( $string ) : \mb_strlen( $string, $encoding ); |
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} else { |
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return \strlen( $string ); |
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} |
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} |
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|
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/** |
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* Returns true when mbstring is available. |
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* |
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* @param bool|null $override Allows overriding the decision. |
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* |
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* @return bool |
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*/ |
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public function mbstring_available() |
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{ |
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|
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$available = \extension_loaded( 'mbstring' ); |
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|
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return $available; |
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} |
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|
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public function load_assets_on_demand() |
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{ |
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return get_option( 'getwid_load_assets_on_demand', false ); |
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} |
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|
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public function move_css_to_head() |
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{ |
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return get_option( 'getwid_move_css_to_head', false ); |
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} |
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|
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} |
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|
