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MarkdownContentParser.php
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MarkdownContentParser.php
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<?php declare(strict_types=1);
/* Extension modeled after: https://saaze.dev/docs/extending
Elmar Klausmeier, 05-Apr-2021
Elmar Klausmeier, 11-Apr-2021
Elmar Klausmeier, 22-Apr-2021, added wpvideo()
Elmar Klausmeier, 30-Aug-2021, added codepen()
Elmar Klausmeier, 06-Sep-2021, no longer extension, but included in class MarkdownContentParser
Elmar Klausmeier, 18-Sep-2021, added mermaid()
Elmar Klausmeier, 12-Apr-2022, added gallery()
Elmar Klausmeier, 15-Apr-2022, debugged gallery()
Elmar Klausmeier, 18-Apr-2022, integrated excerpt
Elmar Klausmeier, 20-Apr-2022, added markmap()
Elmar Klausmeier, 31-Dec-2022, added youtubelt() therefore reducing JS bloat
Elmar Klausmeier, 26-Jan-2023, fixed \cases{} TeX issue, needs config in templates as well
Elmar Klausmeier, 25-Apr-2023, added tiktok(), corrected twitter()
Elmar Klausmeier, 09-May-2023, added hackLNHighlight() to accomodate for PrismJS line highlighting
*/
namespace Saaze;
//use ParsedownExtra; // notoriously slow
class MarkdownContentParser {
const GALLERY_CSS0 = <<<EOD
/* From: https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_slideshow_gallery */
* { box-sizing: border-box; }
img { vertical-align: middle; }
/* Position the image container (needed to position the left and right arrows) */
.gallery_container { position: relative; }
.gallery_cursor { cursor: pointer; } /* Add a pointer when hovering over the thumbnail images */
.gallery_prev, .gallery_next { /* Next & previous buttons */
cursor: pointer;
position: absolute;
top: 40%;
width: auto;
padding: 16px;
margin-top: -50px;
color: white;
font-weight: bold;
font-size: 20px;
border-radius: 0 3px 3px 0;
user-select: none;
-webkit-user-select: none;
}
/* Position the "next button" to the right */
.gallery_next { right: 0; border-radius: 3px 0 0 3px; }
/* On hover, add a black background color with a little bit see-through */
.gallery_prev:hover, .gallery_next:hover { background-color: rgba(0, 0, 0, 0.8); }
.gallery_numbertext { /* Number text (1/3 etc) */
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}
.gallery_caption_container { /* Container for image text */
text-align: center;
background-color: #222;
padding: 2px 16px;
color: white;
}
EOD;
const GALLERY_JS0 = <<<EOD
var slideIndex = new Array();
function plusSlides(k,n) { showSlides(k,slideIndex[k] += n); }
function currentSlide(k,n) { showSlides(k,slideIndex[k] = n); }
function showSlides(k,n) {
var i;
var slides = document.getElementsByClassName("gallery_slides"+k);
var dots = document.getElementsByClassName("gallery_demo"+k);
var captionText = document.getElementById("gallery_caption"+k);
if (n > slides.length) {slideIndex[k] = 1}
if (n < 1) {slideIndex[k] = slides.length}
for (i=0; i < slides.length; i++)
slides[i].style.display = "none";
for (i=0; i < dots.length; i++)
dots[i].className = dots[i].className.replace(" active", "");
slides[slideIndex[k]-1].style.display = "block";
dots[slideIndex[k]-1].className += " active";
captionText.innerHTML = dots[slideIndex[k]-1].alt.length ?
dots[slideIndex[k]-1].alt : slideIndex[k] + " / " + slides.length;
}
EOD;
//public function __construct() {
// // initialize md4c so that we can use it in parallel
//}
/**
* xxx is string between [codepen] xxx [/codepen], and should be in format user / hash.
* Example: [codepen] thebabydino/eJrPoa [/codepen]
*/
static public function codepenHelper(string $xxx, int &$flag, string &$left, string &$right) : string {
$code = explode("/",$xxx);
if (count($code) != 2) return $xxx;
if ($flag === 1) {
$flag = 2;
$right = ' style="height:300px; box-sizing:border-box; display:flex;'
. ' align-items:center; justify-content:center;'
. ' border:2px solid; margin:1em 0; padding:1em;">';
} else if ($flag === 0) $flag = 1;
return ' data-slug-hash=' . trim($code[1])
. ' data-user=' . trim($code[0]);
}
/**
* Overall slow. Also has trouble with Github-flavored tables.
* But good example how to just convert Markdown to HTML
*
public function toHtml(string $content, array $frontmatter=null) : string {
return ParsedownExtra::instance()
->setBreaksEnabled(true)
->text($content);
}
*/
private int $codepenFlag; // JavaScript code for Codepen should only be included once
private int $numOfGalleries; // count number of galleries in one blog post
private int $numOfMarkmaps; // count number of markmaps in one blog post
private string $cssGallery; // CSS before HTML for galleries
private string $jsGallery; // JavaScript after HTML for galleries
private string $cssMarkmap; // CSS before HTML for markmaps: not used, is in cssGallery instead
private string $jsMarkmap; // JavaScript after HTML for markmaps: not used, is in jsGallery instead
/**
* Work on abc $$uvw$$ xyz.
* Needs MathJax. For this you have to include:
* <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
* <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
*/
private function displayMath(string $content) : string {
$last = 0;
for (;;) {
$start = strpos($content,'$$',$last);
if ($start === false) break;
$end = strpos($content,'$$',$start+2);
if ($end === false) break;
$last = $end + 2;
$math = substr($content,$start,$last-$start);
$math = str_replace('\>','\: ',$math);
$math = str_replace('<','\lt ',$math);
$math = str_replace('>','\gt ',$math);
//printf("toHtml(): fileToRender=%s, last=%d, start=%d, end=%d, %s[%s]\n",$GLOBALS['fileToRender'],$last,$start,$end,substr($content,$start,$end-$start+2),substr($content,0,12));
$content = substr($content,0,$start)
. "\n<div class=math>\n"
. $math
. "\n</div>\n"
. substr($content,$last);
$last = $start + strlen("\n<div class=math>\n") + strlen($math) + strlen("\n</div>\n");
}
return $content;
}
/**
* Work on abc $uvw$ xyz.
*/
private function inlineMath(string $content) : string {
$last = 0;
$i = 0;
for (;;) {
//if (++$i > 10) break;
$start = strpos($content,'$',$last);
if ($start === false) break;
// Check if display math with double dollar found?
if (substr($content,$start+1,1) == '$') { $last = $start + 2; continue; }
$end = strpos($content,'$',$start+1);
if ($end === false) break;
// Check for display math again, just in case
if (substr($content,$end+1,1) == "$") { $last = $end + 2; continue; }
// Replace $xyz$" with \\(xyz\\)
$last = $end + 1;
$math = substr($content,$start+1,$end-$start-1);
//$math = str_replace('_','\_',$math);
$math = str_replace('\\{','\\\\{',$math);
$math = str_replace('\\}','\\\\}',$math);
/* Substitute $ to \\(
$content = substr($content,0,$start)
. '\\\\('
. $math
. '\\\\)'
. substr($content,$end+1);
$last = $start + strlen('\\\\(') + strlen($math) + strlen('\\\\)');
*/
$content = substr($content,0,$start)
. '$' . $math . '$'
. substr($content,$end+1);
$last = $start + 2+ strlen($math);
}
return $content;
}
/**
* Convert [abc]xxx[/uvw] tags in your markdown to HTML:
* $begintag xxx $endtag -> $left xxx $right
*/
private function myTag(string $content, string $begintag, string $endtag, string $left, string $right, string|null $callback=NULL) : string {
$last = 0;
$len1 = strlen($begintag);
$len2 = strlen($endtag);
for (;;) {
$start = strpos($content,$begintag,$last);
if ($start === false) break;
$end = strpos($content,$endtag,$start+$len1);
if ($end === false) break;
$xxx = trim(substr($content,$start+$len1,$end-$start-$len1));
if ($callback !== NULL)
$xxx = call_user_func_array(__NAMESPACE__.$callback,array($xxx,&$this->codepenFlag,&$left,&$right));
$last = $end + $len2;
$content = substr_replace($content, $left . $xxx . $right, $start, $last-$start);
}
return $content;
}
/**
* Convert [youtube]xxx[/youtube] tags in your markdown to HTML:
* <iframe width="560" height="315" src=https://www.youtube.com/embed/xxx
* frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
* Example: [youtube] a5pnnkXpX-U [/youtube]
*/
private function youtube(string $content) : string {
return $this->myTag($content, "[youtube]", "[/youtube]",
"<iframe width=560 height=315 src=https://www.youtube.com/embed/",
" frameborder=0 allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen></iframe>"
);
}
/**
* YouTube lowtech/light is similar to [youtube] but does not incur the hight cost of YouTube's JavaScript libraries
* Convert [youtubelt]xxx[/youtubelt] tags in your markdown to HTML:
* <a href=\"https://www.youtube.com/watch?v=xxx"><img src="https://i.ytimg.com/vi/xxx/hqdefault.jpg"></a>
* Example: [youtubelt] a5pnnkXpX-U [/youtubelt]
*/
private function youtubelt(string $content) : string {
$last = 0;
$begintag = "[youtubelt]";
$endtag = "[/youtubelt]";
$len1 = strlen($begintag);
$len2 = strlen($endtag);
for (;;) {
$start = strpos($content,$begintag,$last);
if ($start === false) break;
$end = strpos($content,$endtag,$start+$len1);
if ($end === false) break;
$xxx = trim(substr($content,$start+$len1,$end-$start-$len1));
$last = $end + $len2;
$content = substr_replace($content, "<a href=\"https://www.youtube.com/watch?v=".$xxx."\"><img alt=YouTube src=\"https://i.ytimg.com/vi/".$xxx."/hqdefault.jpg\"></a>", $start, $last-$start);
}
return $content;
}
/**
* Convert [vimeo]126529871[/vimeo] tags in your markdown to HTML:
* <iframe src="https://player.vimeo.com/video/126529871" width="640" height="360"
* frameborder="0" allow="autoplay; fullscreen; picture-in-picture" allowfullscreen></iframe>
* Example: [vimeo] 126529871 [/vimeo]
*/
private function vimeo(string $content) : string {
return $this->myTag($content, "[vimeo]", "[/vimeo]",
"<iframe src=https://player.vimeo.com/video/",
" width=560 height=315 frameborder=0 allow=\"autoplay; fullscreen; picture-in-picture\" allowfullscreen></iframe>"
);
}
/**
* Convert [tiktok]xxx[/tiktok] tags in your markdown to HTML:
* <blockquote class="tiktok-embed" cite="https://www.tiktok.com/@CREATOR/video/VIDEOID" data-video-id="VIDEOID" style="max-width: 605px;min-width: 325px;">
* <section><a target="_blank" title="@CREATOR" href="https://www.tiktok.com/@CREATOR?refer=embed">@CREATOR</a></section>
* </blockquote>
* <script async src="https://www.tiktok.com/embed.js"></script>
*
* Example: [tiktok] https://www.tiktok.com/@neuroscienceandyou/video/7223065474198818053 [/tiktok]
*/
private function tiktok(string $content) : string {
$last = 0;
$begintag = "[tiktok]";
$endtag = "[/tiktok]";
$len1 = strlen($begintag);
$len2 = strlen($endtag);
for (;;) {
$start = strpos($content,$begintag,$last);
if ($start === false) break;
$end = strpos($content,$endtag,$start+$len1);
if ($end === false) break;
$xxx = trim(substr($content,$start+$len1,$end-$start-$len1));
$creatorpos1 = strpos($xxx,'@');
if ($creatorpos1 === false) break; // no creator
$creatorpos2 = strpos($xxx,'/video/',$creatorpos1);
if ($creatorpos2 === false) break; // no creator
$creator = substr($xxx,$creatorpos1,$creatorpos2 - $creatorpos1);
$videoId = substr($xxx,$creatorpos2+7);
$last = $end + $len2;
$content = substr_replace($content,
'<blockquote class="tiktok-embed" cite="https://www.tiktok.com/' . $creator . '/video/' . $videoId
. '" data-video-id="' . $videoId . '" style="max-width: 605px;min-width: 325px;">' . "\n\t"
. '<section><a target="_blank" title="' . $creator . '" href="https://www.tiktok.com/' . $creator . '?refer=embed">' . $creator
. "</a></section>\n</blockquote>\n",
$start, $last-$start);
}
return $content;
}
/**
* Convert [twitter]xxx[/twitter] tags in your markdown HTML which Twitter-JavaScript understands.
* xxx is for example: https://twitter.com/eklausmeier/status/1352896936051937281
* i.e., just the URL, no other information is required.
* This xxx is "Copy link to Tweet" button in Twitter.
*
* Make sure that your layout-template contains the following:
* <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
* or set "Twitter: true" in your frontmatter.
*/
private function twitter(string $content) : string {
return $this->myTag($content, "[twitter]", "[/twitter]",
"<blockquote class=\"twitter-tweet\"><a href=\"",
"\"></a></blockquote>"
);
}
/**
* Convert [codepen] user / hash [/codepen] tags in your markdown to HTML.
* Example: [codepen] thebabydino/eJrPoa [/codepen]
* Needs codepenHelper() function to separate user/hash pair.
*/
private function codepen(string $content) : string {
$left = "<p class=codepen data-height=300 data-default-tab=\"html,result\"";
// right-variable will be changed, if codepen occurs more than once
$right = " style=\"height:300px; box-sizing:border-box; display:flex;"
. " align-items:center; justify-content:center;"
. " border:2px solid; margin:1em 0; padding:1em;\">"
. " <script async src=https://cpwebassets.codepen.io/assets/embed/ei.js></script>";
return $this->myTag($content,"[codepen]","[/codepen]",$left,$right,"\MarkdownContentParser::codepenHelper");
}
/**
* Convert [mermaid] Mermaid code [/mermaid] tags in your markdown to HTML.
* Example:
* [mermaid]
* pie title Simple chart
* "A": 75
* "B": 25
* [/mermaid]
*/
private function mermaid(string $content) : string {
return $this->myTag($content,"[mermaid]","[/mermaid]","\n<div class=mermaid>\n","\n</div>\n");
}
/**
* Convert [markmap] markmap code [/markdown] tags in your markdown to HTML.
* Example:
* [markmap]
* # markmap
* ## autoloader
* ## transformer
* [/markmap]
*/
private function markmap(string $content) : string {
if (($this->numOfMarkmaps += 1) <= 1) {
$this->cssMarkmap .= "<style> .markmap > svg { width: 100%; height: 300px; } </style>\n";
$this->jsMarkmap .= "<script src=\"https://cdn.jsdelivr.net/npm/markmap-autoloader\"></script>\n";
}
return $this->myTag($content,"[markmap]","[/markmap]","\n<div class=markmap>\n","\n</div>\n");
}
/**
* Convert [gallery] directory regex [/gallery] tags in your markdown to HTML.
* Example:
* [gallery] img/gallery /IMG_20220401.*\.webp/ [/gallery]
* CSS+JS taken from
* https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_slideshow_gallery
*/
private function gallery(string $content) : string {
$last = 0;
for ($i=0;;++$i) {
//if (++$i > 10) break;
$start = strpos($content,'[gallery]',$last);
if ($start === false) break;
$end = strpos($content,'[/gallery]',$start+9);
if ($end === false) break;
$last = $end + 10;
$mid = trim(substr($content,$start+9,$end-$start-9)); // get rid of spaces at begin+end
$midx = strpos($mid,' ');
if ($midx === false) break; // lacking separator between directory & regex
$dirWeb = $dirWebNoPrefix = $dirWeb1 = substr($mid,0,$midx);
if (substr($dirWeb,0,1) === '@') {
$dirWebNoPrefix = substr($dirWeb1,1);
$dirWeb = (\Saaze\Config::$H['global_rbase'] ?? $GLOBALS['rbase'] ?? "/") . $dirWebNoPrefix;
}
$dir = \Saaze\Config::$H['global_path_public'] . $dirWebNoPrefix;
$regex = substr($mid,$midx+1);
if ($i === 0) {
$this->cssGallery = "\n<style>\n";
$this->jsGallery = "\n<script>\n";
}
if (($this->numOfGalleries += 1) <= 1) {
$this->cssGallery .= self::GALLERY_CSS0;
$this->jsGallery .= self::GALLERY_JS0;
}
$cnt = 0;
$dirlist = scandir($dir);
$photolist = array();
foreach ($dirlist as $fn) {
if ($fn === '.' || $fn === '..') continue;
if (preg_match($regex,$fn) !== 1) continue;
if (is_dir($fn)) continue;
$photolist[] = $fn; // push filename
++$cnt;
}
/* Example: Six columns side by side. CSS is dependant on number of photos. */
$this->cssGallery .= "\n.gallery_slides{$this->numOfGalleries} { display: none; } /* Hide the images by default */\n"
. ".gallery_row{$this->numOfGalleries}:after { content: \"\"; display: table; clear: both; }\n"
. sprintf(".gallery_column%d { float:left; width:%f%%; }\n",$this->numOfGalleries,100/$cnt)
. ".gallery_demo{$this->numOfGalleries} { opacity: 0.6; } /* Add a transparency effect for thumbnail images */\n"
. ".active, .gallery_demo{$this->numOfGalleries}:hover { opacity: 1; }\n";
$this->jsGallery .= "slideIndex[{$this->numOfGalleries}] = 1;\n"
. "showSlides({$this->numOfGalleries},slideIndex[{$this->numOfGalleries}]);\n";
$html = "<div class=\"gallery_container\">\n";
$k=0;
foreach ($photolist as $fn) {
$html .= sprintf("\t<div class=gallery_slides%d style=\"display:%s;\"><div class=gallery_numbertext>"
. "%d / %d</div><img src=\"%s/%s\" alt=\"%s\" style=\"width:100%%\"></div>\n",
$this->numOfGalleries, $k ? "none":"block", $k+1, $cnt, $dirWeb, $fn, $fn);
++$k;
}
$html .= "\t<a class=\"gallery_prev\" onclick=\"plusSlides({$this->numOfGalleries},-1)\">❮</a>\n"
. "\t<a class=\"gallery_next\" onclick=\"plusSlides({$this->numOfGalleries},1)\">❯</a>\n"
. "\t<div class=gallery_caption_container><p id=gallery_caption{$this->numOfGalleries}></p></div>\n"
. "\t<div class=\"gallery_row{$this->numOfGalleries}\">\n";
$k=0;
foreach ($photolist as $fn) {
$html .= sprintf("\t\t<div class=gallery_column%d>"
. "<img class=\"gallery_demo%d gallery_cursor%s\" "
. "src=\"%s/%s\" alt=\"%s\" style=\"width:100%%\" onclick=\"currentSlide(%d,%d)\"></div>\n",
$this->numOfGalleries, $this->numOfGalleries, $k ? "":" active",
$dirWeb, $fn, $fn, $this->numOfGalleries, $k+1);
++$k;
}
$html .= "\t</div>\n</div>\n";
//$tst = "\ndir=$dir, dirWeb=$dirWeb regex=$regex, mid=|$mid|, midx=$midx, rbase={$GLOBALS['rbase']}\n";
$content = substr($content,0,$start) . $html . substr($content,$end+10);
$last = $start + strlen($html);
}
if ($i > 0) {
$this->cssGallery .= "</style>\n\n";
$this->jsGallery .= "</script>\n\n";
}
return $content;
}
/**
* Simply drop [more_WP_Tag], the WordPress <!--more--> tag
*/
private function moreTag(string $content) : string {
return str_replace("[more_WP_Tag]","<!--more-->",$content);
}
/**
* [wpvideo xxx w=400 h=224] -> <iframe...></iframe>
* <iframe width='400' height='224' src='https://video.wordpress.com/embed/RLkLgz2V?hd=0&autoPlay=0&permalink=0&loop=0' frameborder='0' allowfullscreen></iframe>
*/
private function wpvideo(string $content) : string {
return preg_replace(
'/\[wpvideo\s+(\w+)\s+w=(\w+)\s+h=(\w+)\s*\]/',
"<iframe width='$2' height='$3' src='https://video.wordpress.com/embed/$1&autoplay=0' allowfullscreen></iframe>",
$content
);
}
/**
* Dirty hack to enable linenumber highlighting with PrismJS
* It operates on the HTML generated by the Markdown to HTML converter, here MD4C
* Replace </p>\n<pre><code class="language-XXX ABC" with </p>\n<pre ABC><code class="language-XXX">
* Below regex does not work as we need to decode the HTML entities introduced by MD4C
$html = preg_replace(
"/<\/p>\n<pre><code class=\"language-(\w+)\[([ =;\&\w\"\-]+)\]\">/",
"</p>\n<pre $2><code class=\"language-$1\">",
$html
);
*/
private function hackLNHighlight(string $html) : string {
$last = 0;
$srch = ">\n<pre><code class=\"language-";
$srchlen = strlen($srch);
for (;;) {
$start = strpos($html,$srch,$last);
if ($start === false) break;
$last = $start + $srchlen; // for next round
$end = strpos($html,'>',$last); // find closing >
if ($end === false) continue; // very strange, but skip it
$leftb = strpos($html,'[',$last);
if ($leftb === false || $leftb > $end) {
$html = substr_replace($html,'<pre class="line-numbers">',$start+2,5);
continue; // just insert line-numbers
}
$rightb = strpos($html,']',$leftb+1);
if ($rightb === false) continue; // unmatched bracket, probably an error
$dataLine = html_entity_decode(substr($html,$leftb+1,$rightb-$leftb-1));
$count = 0;
$dataLine = ltrim(str_ireplace('/nonr','',$dataLine,$count));
$dataLine = (strlen($dataLine) > 0 ? ' ' : '') . $dataLine;
$html = substr($html,0,$start)
. ">\n<pre" . ($count > 0 ? '' : ' class="line-numbers"') . $dataLine . '>'
. '<code class="language-'
. substr($html,$last,$leftb-$last)
. substr($html,$rightb+1);
}
return $html;
}
private function getExcerpt(string $html, Entry &$entry) : string {
if ($entry->data['more'] ?? $entry->collection->data['more'] ?? false) {
$start = strpos($html,"<!--more-->");
if ($start === false) return $html;
return substr($html,0,$start);
}
$excerpt = strip_tags($html);
$length = $entry->collection->data['excerpt_length'] ?? \Saaze\Config::$H['global_excerpt_length'] ?? 300;
if (strlen($excerpt) > $length) {
$excerptCut = substr($excerpt, 0, $length);
$endPoint = strrpos($excerptCut, ' ');
$excerpt = $endPoint ? substr($excerptCut, 0, $endPoint) : substr($excerptCut, 0);
$excerpt .= '…';
}
return $excerpt;
}
/**
* Parse raw content and return HTML
*/
private array $keywords = Array('MathJax/Dummy','[youtube]','[youtubelt]','[vimeo]','[tiktok]','[twitter]','[codepen]','[wpvideo','[mermaid]','[gallery]','[markmap]');
// pass by reference for entry
public function toHtml(string $content, Entry &$entry) : string {
$t0 = microtime(true);
$this->codepenFlag = 0; // reset for every new blog page
$this->numOfGalleries = 0; // reset for every new blog page
$this->numOfMarkmaps = 0;
$this->cssGallery = "";
$this->jsGallery = "";
$this->cssMarkmap = "";
$this->jsMarkmap = "";
$content = $this->moreTag($content); // more-tag can occur anywhere
// Performance optimization only, no functional benefit.
// Only marginally relevant if you have more than a few hundred posts.
$hasKeyword = 0; // used as bitset
for ($i=1; $i<=10; ++$i) { // 10 = count($keywords)-1
if (strpos($content,$this->keywords[$i]) === false) continue;
$hasKeyword |= 1 << $i;
}
$hasMath = $entry->data['MathJax'] ?? false; //isset($frontmatter['MathJax']);
if ($hasMath) $hasKeyword |= 1;
$hasYoutube = $hasKeyword & 2;
$hasYoutubeLT = $hasKeyword & 4;
$hasVimeo = $hasKeyword & 8;
$hasTiktok = $hasKeyword & 16;
$hasTwitter = $hasKeyword & 32;
$hasCodepen = $hasKeyword & 64;
$hasWpvideo = $hasKeyword & 128;
$hasMermaid = $hasKeyword & 256;
$hasGallery = $hasKeyword & 512;
$hasMarkmap = $hasKeyword & 1024;
if ($hasKeyword) {
$arr = explode("`",$content); // known deficiency: does not cope for HTML comments
// even elements can be changed, uneven are code-block elements
// 0 `1`2` 3 `4`5` 6 ...
// special case: ``` has two empty slots
$empty = 0;
$incr = 1;
$newline = 0;
//$fp = fopen("/tmp/MathParser.debug","w");
for ($i=0, $size=count($arr); $i<$size; ++$i) {
if (strlen($arr[$i]) == 0) {
if ($i>0 && ($empty == 0 || $empty == 2) && substr($arr[$i-1],-1) == "\n") {
$newline = 1;
}
if ($newline == 1) $empty += $incr;
if ($empty == 2) {
$incr = -1;
$newline = 0;
} else if ($empty == 0) {
$incr = 1;
$newline = 0;
}
}
//fprintf($fp,"i=%d, empty=%d, incr=%d, newline=%d, arr[i-1]=%d~%s\n",$i,$empty,$incr,$newline,$i<=0?(-55):ord(substr($arr[$i-1],-1)),$i<=0?"***":substr($arr[$i-1],-19,18));
if ($i % 2 == 1) continue; // skip uneven: 0 `1` 2
if ($incr < 0) continue; // skip code section starting with ```
if ($hasMath) {
$arr[$i] = $this->displayMath($arr[$i]);
$arr[$i] = $this->inlineMath($arr[$i]);
}
if ($hasYoutube) $arr[$i] = $this->youtube($arr[$i]);
if ($hasYoutubeLT) $arr[$i] = $this->youtubelt($arr[$i]);
if ($hasVimeo) $arr[$i] = $this->vimeo($arr[$i]);
if ($hasTiktok) $arr[$i] = $this->tiktok($arr[$i]);
if ($hasTwitter) $arr[$i] = $this->twitter($arr[$i]);
if ($hasCodepen) $arr[$i] = $this->codepen($arr[$i]);
if ($hasWpvideo) $arr[$i] = $this->wpvideo($arr[$i]);
if ($hasMermaid) $arr[$i] = $this->mermaid($arr[$i]);
if ($hasGallery) $arr[$i] = $this->gallery($arr[$i]);
if ($hasMarkmap) $arr[$i] = $this->markmap($arr[$i]);
}
$modContent = implode("`",$arr);
} else {
$modContent = $content;
}
$t1 = microtime(true);
$GLOBALS['toHtml'] += $t1 - $t0;
$GLOBALS['toHtmlNcall'] += 1;
$html = isset(\Saaze\Config::$H['global_ffi']) ?
\FFI::string( \Saaze\Config::$H['global_ffi']->md4c_toHtml($modContent) ) // Markdown to HTML conversion
: md4c_toHtml($modContent); // Markdown to HTML conversion with MD4C PHP extension
/* * * More efficient to do it in template PHP files
if (isset(\Saaze\Config::$H['global_markdown_with_php'])) { // run PHP over generated HTML
ob_start();
require 'data:text/plain;base64,'.base64_encode($html);
$html = ob_get_contents();
ob_end_clean();
}
* * */
if ($entry->data) {
$entry->data['excerpt'] ??= $this->getExcerpt($html,$entry); // do not overwrite excerpt, if user already provided it
if ($hasGallery) {
$entry->data['gallery_css'] = $this->cssGallery;
$entry->data['gallery_js'] = $this->jsGallery;
}
if ($hasMarkmap) {
$entry->data['markmap_css'] = $this->cssMarkmap;
$entry->data['markmap_js'] = $this->jsMarkmap;
}
if ($entry->data['prismjs'] ?? false) {
$html = $this->hackLNHighlight($html);
}
}
//$html = $this->cssGallery . $html . $this->jsGallery; // does not pass test in https://validator.w3.org/
$GLOBALS['md2html'] += microtime(true) - $t1;
return $html;
}
}