Due to Google AMP (Accelerated Mobile Pages) , I have been looking for a way to effectively do Syntax Highlighting without Javascript in pure PHP.
I was about to write my own, when I found an older article from phoboslab. Thanks Dominic for saving me some time ;) Its not perfect, but close enough.
A simple Syntax Highlighting Class that does just that. The class was not working with PHP 5.4.x+, as it uses preg_replace() with the /e modifier.
It will not cover all, but its better than nothing :) I will also add a section to my my AMP tweaks article to showcase the integration of Geshi.
Here an updated version using the preg_replace_callback() function.
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class SyntaxHighlight { static $tokens = array();// This array will be filled from the regexp-callback public static function process($s) { $s = htmlspecialchars($s); // Workaround for escaped backslashes $s = str_replace('\\\\','\\\\<e>', $s); $regexp = array( // Punctuations '/([\-\!\%\^\*\(\)\+\|\~\=`\{\}\[\]\:\"\'<>\?\,\.\/]+)/' => '<span class="P">$1</span>', // Numbers (also look for Hex) '/(?<!\w)( (0x|\#)[\da-f]+| \d+| \d+(px|em|cm|mm|rem|s|\%) )(?!\w)/ix' => '<span class="N">$1</span>', // Make the bold assumption that an // all uppercase word has a special meaning '/(?<!\w|>|\#)( [A-Z_0-9]{2,} )(?!\w)/x' => '<span class="D">$1</span>', // Keywords '/(?<!\w|\$|\%|\@|>)( and|or|xor|for|do|while|foreach|as|return|die|exit|if|then|else| elseif|new|delete|try|throw|catch|finally|class|function|string| array|object|resource|var|bool|boolean|int|integer|float|double| real|string|array|global|const|static|public|private|protected| published|extends|switch|true|false|null|void|this|self|struct| char|signed|unsigned|short|long )(?!\w|=")/ix' => '<span class="K">$1</span>', // PHP/Perl-Style Vars: $var, %var, @var '/(?<!\w)( (\$|\%|\@)(\->|\w)+ )(?!\w)/ix' => '<span class="V">$1</span>' ); $s = preg_replace_callback( '/( \/\*.*?\*\/| \/\/.*?\n| \#.[^a-fA-F0-9]+?\n| \<\!\-\-[\s\S]+\-\-\>| (?<!\\\)".*?(?<!\\\)"| (?<!\\\)\'(.*?)(?<!\\\)\' )/isx' , array('SyntaxHighlight', 'replaceId'),$s); $s = preg_replace(array_keys($regexp), array_values($regexp), $s); // Paste the comments and strings back in again $s = str_replace(array_keys(SyntaxHighlight::$tokens), array_values(SyntaxHighlight::$tokens), $s); // Delete the "Escaped Backslash Workaround Token" (TM) // and replace tabs with four spaces. $s = str_replace(array('<e>', "\t"), array('', ' '), $s); return '<pre>'.$s.'</pre>' ; } // Regexp-Callback to replace every comment or string with a uniqid and save // the matched text in an array // This way, strings and comments will be stripped out and wont be processed // by the other expressions searching for keywords etc. static function replaceId($match) { $id = "##r" . uniqid() . "##"; // String or Comment? if(substr($match[1], 0, 2) == '//' || substr($match[1], 0, 2) == '/*' || substr($match[1], 0, 2) == '##' || substr($match[1], 0, 7) == '<!--') { SyntaxHighlight::$tokens[$id] = '<span class="C">' . $match[1] . '</span>'; } else { SyntaxHighlight::$tokens[$id] = '<span class="S">' . $match[1] . '</span>'; } return $id; } } |
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pre { font-family: 'Courier New', 'Bitstream Vera Sans Mono', 'monospace'; font-size: 9pt; border-top: 1px solid #333; border-bottom: 1px solid #333; padding: 0.4em; color: #fff; } pre span.N{ color:#f2c47f; } /* Numbers */ pre span.S{ color:#42ff00; } /* Strings */ pre span.C{ color:#838383; } /* Comments */ pre span.K{ color:#ff0078; } /* Keywords */ pre span.V{ color:#70d6ff; } /* Vars */ pre span.D{ color:#ff9a5d; } /* Defines */ |
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echo SyntaxHighlight::process( $your_code ); |
@GitHub portalzine/UtilityBelt/SyntaxHighlight
“virtPHP is a tool for creating and managing multiple isolated PHP environments on a single machine. It’s like Python’s virtualenv, but for PHP.
virtPHP creates isolated environments so that you may run any number of PHP development projects, all using different versions of PEAR packages and different PECL extensions. You may even specify a different version of PHP, if your system has various installations of PHP.”
The AMP (Accelerated Mobile Pages Project) plugin for WordPress is still pretty young and under heavy development.
There are little things that can help to fix current validation problems. I have a couple of fresh AMP pages, that are already indexed by Google.
The currently registered Microformats template (schema.org-NewsArticle) requires an image.
The AMP-WP documentation explains how to add a featured image to your pages (documentation).
I extended that a bit, to link a default attachment image, I uploaded before. This needs to be added to your themes functions.php.
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function xyz_amp_add_custom_actions() { add_filter( 'the_content', 'xyz_amp_add_featured_image' ); } function xyz_amp_add_featured_image( $content ) { $your_attachment_id = 2016; if ( has_post_thumbnail() ) { $image = sprintf( '<p class="xyz-featured-image">%s</p>', get_the_post_thumbnail() ); }else{ $image = sprintf( '<p class="xyz-featured-image">%s</p>', wp_get_attachment_image( $your_attachment_id, 1280) ); $content = $image . $content ; } $content = $image . $content ; return preg_replace('/(<br>\s*){2,}/', '<br/>',$content); } |
Next we adjust the Microformats definition. This needs to be added to your themes functions.php.
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add_filter( 'amp_post_template_metadata', 'xyz_amp_modify_json_metadata', 10, 2 ); function xyz_amp_modify_json_metadata( $metadata, $post ) { if(empty($metadata['image'])){ $your_attachment_id = 2016; $imgMeta = wp_get_attachment_metadata($your_attachment_id ); $metadata['image'] = array( '@type' => 'ImageObject', 'url' => wp_get_attachment_url( $your_attachment_id ), 'height' => $imgMeta['height'], 'width' => $imgMeta['width'], ); } return $metadata; } |
Read the AMP-WP documentation first :) This forces AMP-WP to override the core template with your own. Use the default template as a reference.
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add_filter( 'amp_post_template_file', 'xyz_amp_set_custom_template', 10, 3 ); function xyz_amp_set_custom_template( $file, $type, $post ) { if ( 'single' === $type ) { $file = dirname( __FILE__ ) . '/amp/amp_template.php'; } return $file; } |
Normally the core sanitizer should take care of that. I am sure a filter will be added in the future. For now, this is a quick workaround. You can use a RegExp or DOMDocument to alter the amp-content in your custom template and filter things that break validation.
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$attributes = $element->attributes; while ($attributes->length) { $element->removeAttribute($attributes->item(0)->name); } |
I am using phpQuery for now, as it allows me to add quick fixes. DOMNode or QueryPath works nicely as well :) Will be looking at the core sanitizer and options later this week. All of this is currently added to the custom template.
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require('your-libs/phpQuery/phpQuery.php'); $doc = phpQuery::newDocumentHTML($this->get( 'post_amp_content' )); |
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$doc['.prettyphoto']->removeAttr("rel"); |
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$doc['*']->removeAttr("align"); |
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$doc['a[target="new"]']->attr("target","_blank"); |
Finally output the fixed content as HTML.
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echo $doc->html(); // amphtml content; no kses |
The above examples need to be tweaked to your specific content requirements.
The custom template “post_amp_content” before:
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echo $this->get( 'post_amp_content'); // amphtml content; no kses |
The custom template “post_amp_content” after:
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require('your-libs/phpQuery/phpQuery.php'); $doc = phpQuery::newDocumentHTML($this->get( 'post_amp_content' )); $doc['.prettyphoto']->removeAttr("rel")->removeAttr("href"); $doc['*']->removeAttr("align"); $doc['a[target="new"]']->attr("target","_blank"); echo $doc->html(); // amphtml content; no kses |
From the AMP specification :”Note, that AMP document may also be linked to directly…”
This is being added to the custom template as well.
Next:
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global $query_string; $posts = query_posts($query_string); if (have_posts()) : while (have_posts()) : the_post(); $next_post = get_next_post(); if (!empty( $next_post )): echo '<a class="next" href="'.amp_get_permalink( $next_post->ID ).'"> ↜ '.$next_post->post_title.'</a>'; endif; |
Previous:
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$prev_post = get_previous_post(); if (!empty( $prev_post )): echo '<a class="prev" href="'.amp_get_permalink( $prev_post->ID ).'"> ↜ '.$prev_post->post_title.'</a>'; endif; |
You can find a simple pure PHP highlighter here. Not perfect, but a start. Don not forget to include the CSS :)
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require_once("your-lib/SyntaxHighlight/SyntaxHighlight.php"); foreach(pq('pre') as $code) { pq($code)->html(SyntaxHighlight::process(pq($code)->text())); } |
I will extend on this as new validation errors or tweaks come up. The core sanitizer of AMP-WP still needs some work and should allow us to do some of the above directly, when the content is parsed / converted for AMP.
Structure opened its doors a couple of days ago.
Structure offers a simple and powerful IoT cloud platform for developing the next generation of connected experiences. They offer device management with robust data visualization that reacts in real-time.
They have a nice drag & drop workflow interface that allows you to forward data coming in, combine data or just store it.
I will be testing a builder kit with the platform, that includes the Adafruit Feather Huzzah, which offers native Wifi connectivity. My Raspberry Pi’s will also find their way into the system. The platform allows to consume REST Apis as well, that will make it even more fun to build something unique.
If you are interested in IoT, you should really check it out. Its free :)
Structure / Adafruit Feather Huzzah
Google’s AMP is here to save us from slow mobile content delivery, by enforcing strict standards and limiting what is allowed within AMP pages. The pages only allow a subset of tags and introduce their own tags for fast prefetching of content (images, videos … AMP Specs)
“The Accelerated Mobile Pages (“AMP”) Project is an open source initiative that came out of discussions between publishers and technology companies about the need to improve the entire mobile content ecosystem for everyone – publishers, consumer platforms, creators, and users.
Today, the expectation is that content should load super fast and be easy to explore. The reality is that content can take several seconds to load, or, because the user abandons the slow page, never fully loads at all. Accelerated Mobile Pages are web pages designed to load instantaneously – they are a step towards a better mobile web for all.”
AMP pages are cached within the AMP Cache, providing even faster delivery of your content. The core libs validate your implementation and highlight any problems by pushing errors to the console.
The documentation lists all components currently supported within a page and experimental components in development as well.
I have already added AMP support to our blog posts:
Google’s Webmaster Tools also integrates a new section for AMP, to see how they perform.
AMP is not supposed to replace your webpage, but offer a faster access point to presented content. It will not solve all use cases, but offer better performance for your simple reading pleasure for now. Its a start and lets see how it evolves ;)
Simple way to do some Visual Composer Grid cleanup, when you are using Bootstrap within your theme. This removes and cleans up classes.
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add_filter('vc_shortcodes_css_class', function ($class_string, $tag) { $tags_to_clean = [ 'vc_row', 'vc_column', 'vc_row_inner', 'vc_column_inner' ]; if (in_array($tag, $tags_to_clean)) { $class_string = str_replace(' wpb_row', '', $class_string); $class_string = str_replace(' vc_row-fluid', '', $class_string); $class_string = str_replace(' vc_column_container', '', $class_string); $class_string = str_replace('wpb_column', '', $class_string); // replace vc_, but exclude any custom css // attached via vc_custom_XXX (negative lookahead) $class_string = preg_replace('/vc_(?!custom)/i', '', $class_string); // replace all vc_ // $class_string = preg_replace('/vc_/i', '', $class_string); } $class_string = preg_replace('|col-sm|', 'col-sm', $class_string); return $class_string; }, 10, 2); |
Visual Composer for WordPress
Bootstrap / Bootstrap Sass
Finally decided to replace all switches with ProSafe managed switches from Netgear (GS105E-200PES / GS108E-300PES).
We constantly had client discovery problems across the network, turns out that was mostly a IGMP (Multicast protocol) problem. Now with the new 5-Port and 8-Port switches in place, we can finally enjoy live streaming from everywhere without a problem.
Also removed the last 100 MBit/s connection, so we are finally 1 GBit/s across the whole network. Replaced some areas with the new Powerline adapters from Tenda (P1002P), these support up to 1000 MBit/s :), which allows us to reduce Wifi in many areas.
Happy networking ….
New spanish ad for Word Grain South America – 04/2016
All-in-one voice and text chat for gamers that’s free.
You will also find some nice projects to build bots for the service, like Discord.js for example.
