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<?php |
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/** |
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* Minify_Filters — frontend HTML rewriters for the "smarter minifier" |
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* sub-features (Phase 4.1a): defer JS, delay JS, async CSS, remove |
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* query strings. |
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* |
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* Each method is a WordPress filter callback. None of them touch the |
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* file system — they're pure tag rewrites or src-string rewrites |
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* applied to enqueued asset URLs / tags. |
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* |
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* The heavier combine-CSS / combine-JS engine lands in Phase 4.1b |
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* with its own class; keeping the filter-only logic isolated here |
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* makes that future split clean. |
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* |
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* @package XSpeed |
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*/ |
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|
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declare(strict_types=1); |
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|
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namespace XSpeed; |
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|
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defined( 'ABSPATH' ) || exit; |
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|
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final class Minify_Filters { |
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|
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/** |
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* Settings cache (one read per request). |
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* |
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* @var array|null |
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*/ |
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private static $opts = null; |
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|
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/** |
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* Has the delay-JS bootstrap snippet been printed? Guards against |
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* duplicate emission in pages that hit wp_footer multiple times. |
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*/ |
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private static $delay_bootstrap_printed = false; |
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|
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/** |
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* Filter: `script_loader_tag` — add defer="defer" to non-excluded |
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* scripts. WordPress passes the full <script> tag string, the |
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* handle, and the src. We bail when: |
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* - the user excluded this handle / src substring, |
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* - the tag already has defer or async (don't double-set), |
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* - the tag has no src (inline scripts can't be deferred — would |
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* execute synchronously regardless). |
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* |
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* @param string $tag |
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* @param string $handle |
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* @param string $src |
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*/ |
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public static function defer_script_tag( $tag, $handle, $src ): string { |
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if ( ! is_string( $tag ) || '' === $tag ) { |
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return (string) $tag; |
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} |
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if ( '' === (string) $src ) { |
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return $tag; |
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} |
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if ( self::is_excluded_script( (string) $handle, (string) $src ) ) { |
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return $tag; |
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} |
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if ( false !== stripos( $tag, ' defer' ) || false !== stripos( $tag, ' async' ) ) { |
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return $tag; |
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} |
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return (string) preg_replace( '#<script\b#i', '<script defer="defer"', $tag, 1 ); |
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} |
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|
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/** |
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* Filter: `script_loader_tag` — rewrite src= to data-xs-src= so the |
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* browser ignores it until the bootstrap (printed once on |
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* wp_footer) swaps it back on first user interaction. Same |
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* exclusion rules as defer. Inline scripts (no src) are also |
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* deferred until the first interaction. |
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* |
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* @param string $tag |
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* @param string $handle |
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* @param string $src |
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*/ |
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public static function delay_script_tag( $tag, $handle, $src ): string { |
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if ( ! is_string( $tag ) || '' === $tag ) { |
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return (string) $tag; |
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} |
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if ( self::is_excluded_script( (string) $handle, (string) $src ) ) { |
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return $tag; |
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} |
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// src= variant: swap src → data-xs-src and add data-xs-delay marker. |
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if ( '' !== (string) $src ) { |
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return (string) preg_replace( |
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'#\bsrc\s*=\s*(["\'][^"\']*["\'])#i', |
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'data-xs-src=$1 data-xs-delay="1"', |
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$tag, |
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1 |
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); |
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} |
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// Inline script: change type to text/plain so the browser |
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// doesn't execute, mark for bootstrap rewriter. |
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return (string) preg_replace( |
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'#<script\b([^>]*)>#i', |
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'<script$1 type="text/xspeed-delayed" data-xs-delay="1">', |
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$tag, |
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1 |
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); |
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} |
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|
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/** |
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* Inline bootstrap that flips delayed scripts on the first user |
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* interaction. Printed once on wp_footer priority 1000. |
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*/ |
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public static function print_delay_bootstrap(): void { |
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if ( self::$delay_bootstrap_printed ) { |
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return; |
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} |
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self::$delay_bootstrap_printed = true; |
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// Tiny vanilla bootstrap; keep it self-contained so the page |
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// has no JS dependencies before the first interaction. |
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?> |
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<script id="xspeed-delay-bootstrap"> |
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(function(){ |
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var events=['mousemove','keydown','touchstart','scroll','wheel']; |
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var fired=false; |
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function load(){ |
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if(fired)return;fired=true; |
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events.forEach(function(e){window.removeEventListener(e,load,{passive:true,capture:true});}); |
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var delayed=document.querySelectorAll('script[data-xs-delay]'); |
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delayed.forEach(function(s){ |
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var n=document.createElement('script'); |
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Array.prototype.slice.call(s.attributes).forEach(function(a){ |
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if(a.name==='data-xs-src'){n.setAttribute('src',a.value);return;} |
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if(a.name==='data-xs-delay'||a.name==='type')return; |
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n.setAttribute(a.name,a.value); |
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}); |
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if(!s.hasAttribute('data-xs-src')){n.text=s.text;} |
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s.parentNode.replaceChild(n,s); |
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}); |
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} |
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events.forEach(function(e){window.addEventListener(e,load,{passive:true,capture:true});}); |
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setTimeout(load,8000); |
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})(); |
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</script> |
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<?php |
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} |
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|
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/** |
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* Filter: `style_loader_tag` — wrap stylesheets in the |
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* print → onload="all" pattern so they download non-blocking. |
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* Pairs with critical CSS workflows. Adds a <noscript> fallback so |
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* users with JS disabled still get styles applied (via media="all"). |
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* |
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* @param string $tag |
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* @param string $handle |
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*/ |
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public static function async_style_tag( $tag, $handle ): string { |
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if ( ! is_string( $tag ) || '' === $tag ) { |
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return (string) $tag; |
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} |
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// Only operate on <link rel=stylesheet> with a media attribute |
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// we can swap. Skip anything custom (preload, etc.) — we don't |
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// want to fight with explicit author intent. |
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if ( false === stripos( $tag, 'rel=\'stylesheet\'' ) && false === stripos( $tag, 'rel="stylesheet"' ) ) { |
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return $tag; |
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} |
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// Avoid double-wrapping. |
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if ( false !== stripos( $tag, 'data-xs-async' ) ) { |
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return $tag; |
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} |
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$async = (string) preg_replace_callback( |
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'#\bmedia\s*=\s*(["\'])([^"\']*)\1#i', |
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static function ( $m ) { |
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$orig = $m[2]; |
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return 'media="print" onload="this.media=\'' . esc_attr( $orig ) . '\'" data-xs-async="' . esc_attr( $orig ) . '"'; |
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}, |
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$tag, |
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1 |
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); |
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// If no media= was present (rare), inject one. |
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if ( $async === $tag ) { |
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$async = (string) preg_replace( |
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'#<link\b#i', |
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'<link media="print" onload="this.media=\'all\'" data-xs-async="all"', |
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$tag, |
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1 |
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); |
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} |
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// Fallback for noscript users — re-emit the original tag inside <noscript>. |
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return $async . '<noscript>' . $tag . '</noscript>'; |
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} |
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|
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/** |
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* Filter: `style_loader_src` + `script_loader_src` — strip the |
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* ?ver=X.Y query string that WP appends for cache busting. Some |
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* CDNs / reverse proxies cache better when the URL has no query. |
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* |
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* Skip URLs whose query carries non-ver params — those might be |
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* intentional (e.g. a CDN providing per-image transforms). |
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* |
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* @param string $src |
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*/ |
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public static function strip_version_query( $src ): string { |
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if ( ! is_string( $src ) || '' === $src ) { |
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return (string) $src; |
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} |
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$parts = wp_parse_url( $src ); |
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if ( ! is_array( $parts ) || empty( $parts['query'] ) ) { |
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return $src; |
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} |
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parse_str( $parts['query'], $query ); |
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if ( ! is_array( $query ) ) { |
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return $src; |
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} |
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// Only strip 'ver' — keep anything else the asset URL needs. |
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unset( $query['ver'] ); |
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$new_query = http_build_query( $query ); |
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$new_url = ( $parts['scheme'] ?? 'http' ) . '://' . ( $parts['host'] ?? '' ); |
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if ( isset( $parts['port'] ) ) { |
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$new_url .= ':' . $parts['port']; |
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} |
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$new_url .= $parts['path'] ?? ''; |
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if ( '' !== $new_query ) { |
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$new_url .= '?' . $new_query; |
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} |
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if ( ! empty( $parts['fragment'] ) ) { |
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$new_url .= '#' . $parts['fragment']; |
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} |
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return $new_url; |
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} |
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|
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private static function is_excluded_script( string $handle, string $src ): bool { |
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$opts = self::opts(); |
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$excluded = is_array( $opts['defer_js_excluded'] ?? null ) ? $opts['defer_js_excluded'] : array(); |
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if ( empty( $excluded ) ) { |
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return false; |
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} |
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foreach ( $excluded as $needle ) { |
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$needle = (string) $needle; |
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if ( '' === $needle ) { |
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continue; |
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} |
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if ( $handle === $needle || false !== stripos( $src, $needle ) ) { |
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return true; |
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} |
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} |
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return false; |
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} |
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|
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private static function opts(): array { |
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if ( null === self::$opts ) { |
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self::$opts = Settings_Manager::get( 'minify' ); |
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} |
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return self::$opts; |
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} |
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|
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/** |
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* Test-only — clear cached opts + bootstrap-printed flag. |
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*/ |
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public static function reset_state(): void { |
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self::$opts = null; |
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self::$delay_bootstrap_printed = false; |
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} |
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} |
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|
