348 lines
12 KiB
PHP
348 lines
12 KiB
PHP
<?php
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register_module([
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"name" => "Parsedown",
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"version" => "0.5.3",
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"author" => "Emanuil Rusev & Starbeamrainbowlabs",
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"description" => "An upgraded (now default!) parser based on Emanuil Rusev's Parsedown Extra PHP library (https://github.com/erusev/parsedown-extra), which is licensed MIT. Please be careful, as this module adds a some weight to your installation, and also *requires* write access to the disk on first load.",
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"id" => "parser-parsedown",
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"code" => function() {
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global $settings;
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$parser = new PeppermintParsedown();
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$parser->setInternalLinkBase("?page=%s");
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add_parser("parsedown", function($source) use ($parser) {
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$result = $parser->text($source);
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return $result;
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});
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add_help_section("20-parser-default", "Editor Syntax",
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"<p>$settings->sitename's editor uses an extended version of <a href='http://parsedown.org/'>Parsedown</a> to render pages, which is a fantastic open source Github flavoured markdown parser. You can find a quick reference guide on Github flavoured markdown <a href='https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet'>here</a> by <a href='https://github.com/adam-p/'>adam-p</a>, or if you prefer a book <a href='https://www.gitbook.com/book/roachhd/master-markdown/details'>Mastering Markdown</a> by KB is a good read, and free too!</p>
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<h3>Extra Syntax</h3>
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<p>$settings->sitename's editor also supports some extra custom syntax, some of which is inspired by <a href='https://mediawiki.org/'>Mediawiki</a>.
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<table>
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<tr><th style='width: 40%'>Type this</th><th style='width: 20%'>To get this</th><th>Comments</th></th>
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<tr><td><code>[[Internal link]]</code></td><td><a href='?page=Internal%20link'>Internal Link</a></td><td>An internal link.</td></tr>
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<tr><td><code>[[Display Text|Internal link]]</code></td><td><a href='?page=Internal%20link'>Display Text</a></td><td>An internal link with some display text.</td></tr>
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<tr><td><code></code></td><td><img src='http://example.com/path/to/image.png' alt='Alt text' style='float: right; max-width: 256px; max-height: 256px;' /></td><td>An image floating to the right of the page that fits inside a 256px x 256px box, preserving aspect ratio.</td></tr>
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</table>
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<h4>Templating</h4>
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<p>$settings->sitename also supports including one page in another page as a <em>template</em>. The syntax is very similar to that of Mediawiki. For example, <code>{{Announcement banner}}</code> will include the contents of the \"Announcement banner\" page, assuming it exists.</p>
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<p>You can also use variables. Again, the syntax here is very similar to that of Mediawiki - they can be referenced in the included page by surrrounding the variable name in triple curly braces (e.g. <code>{{{Announcement text}}}</code>), and set when including a page with the bar syntax (e.g. <code>{{Announcement banner | importance = high | text = Maintenance has been planned for tonight.}}</code>). Currently the only restriction in templates and variables is that you may not include a closing curly brace (<code>}</code>) in the page name, variable name, or value.</p>");
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}
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]);
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/*** Parsedown versions ***
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* Parsedown Core: 1.6.0 *
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* Parsedown Extra: 0.7.0 *
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**************************/
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$env->parsedown_paths = new stdClass();
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$env->parsedown_paths->parsedown = "https://cdn.rawgit.com/erusev/parsedown/3ebbd730b5c2cf5ce78bc1bf64071407fc6674b7/Parsedown.php";
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$env->parsedown_paths->parsedown_extra = "https://cdn.rawgit.com/erusev/parsedown-extra/11a44e076d02ffcc4021713398a60cd73f78b6f5/ParsedownExtra.php";
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// Download parsedown and parsedown extra if they don't already exist
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if(!file_exists("./Parsedown.php") || filesize("./Parsedown.php") === 0)
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file_put_contents("./Parsedown.php", fopen($env->parsedown_paths->parsedown, "r"));
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if(!file_exists("./ParsedownExtra.php") || filesize("./ParsedownExtra.php") === 0)
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file_put_contents("./ParsedownExtra.php", fopen($env->parsedown_paths->parsedown_extra, "r"));
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require_once("./Parsedown.php");
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require_once("./ParsedownExtra.php");
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/*
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* ██████ █████ ██████ ███████ ███████ ██████ ██████ ██ ██ ███ ██
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* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ████ ██
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* ██████ ███████ ██████ ███████ █████ ██ ██ ██ ██ ██ █ ██ ██ ██ ██
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* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ███ ██ ██ ██ ██
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* ██ ██ ██ ██ ██ ███████ ███████ ██████ ██████ ███ ███ ██ ████
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*
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* ███████ ██ ██ ████████ ███████ ███ ██ ███████ ██ ██████ ███ ██ ███████
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* ██ ██ ██ ██ ██ ████ ██ ██ ██ ██ ██ ████ ██ ██
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* █████ ███ ██ █████ ██ ██ ██ ███████ ██ ██ ██ ██ ██ ██ ███████
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* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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* ███████ ██ ██ ██ ███████ ██ ████ ███████ ██ ██████ ██ ████ ███████
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*/
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class PeppermintParsedown extends ParsedownExtra
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{
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private $internalLinkBase = "./%s";
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protected $maxParamDepth = 0;
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protected $paramStack = [];
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function __construct()
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{
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// Prioritise our internal link parsing over the regular link parsing
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array_unshift($this->InlineTypes["["], "InternalLink");
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// Prioritise our image parser over the regular image parser
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array_unshift($this->InlineTypes["!"], "ExtendedImage");
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$this->inlineMarkerList .= "{";
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if(!is_array($this->InlineTypes["{"]))
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$this->InlineTypes["{"] = [];
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$this->InlineTypes["{"][] = "Template";
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}
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protected function inlineTemplate($fragment)
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{
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global $env;
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// Variable parsing
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if(preg_match("/\{\{\{([^}]+)\}\}\}/", $fragment["text"], $matches))
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{
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$stackEntry = array_slice($this->paramStack, -1)[0];
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$params = !empty($stackEntry) ? $stackEntry["params"] : false;
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$variableKey = trim($matches[1]);
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$variableValue = false;
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switch ($variableKey)
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{
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case "@":
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if(!empty($params))
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{
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$variableValue = "<table>
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<tr><th>Key</th><th>Value</th></tr>\n";
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foreach($params as $key => $value)
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{
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$variableValue .= "\t<tr><td>" . $this->escapeText($key) . "</td><td>" . $this->escapeText($value) . "</td></tr>\n";
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}
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$variableValue .= "</table>";
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}
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break;
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case "#":
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$variableValue = "<ol start=\"0\">\n";
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$variableValue .= "\t<li>$env->page</li>\n";
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foreach($this->paramStack as $curStackEntry)
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{
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$variableValue .= "\t<li>" . $curStackEntry["pagename"] . "</li>\n";
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}
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$variableValue .= "</ol>\n";
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}
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if(isset($params[$variableKey]))
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{
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$variableValue = $params[$variableKey];
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$variableValue = $this->escapeText($variableValue);
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}
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if($variableValue)
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{
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return [
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"extent" => strlen($matches[0]),
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"markup" => $variableValue
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];
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}
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}
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else if(preg_match("/\{\{([^}]+)\}\}/", $fragment["text"], $matches))
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{
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$templateElement = $this->templateHandler($matches[1]);
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if(!empty($templateElement))
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{
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return [
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"extent" => strlen($matches[0]),
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"element" => $templateElement
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];
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}
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}
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}
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protected function templateHandler($source)
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{
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global $pageindex, $paths;
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$parts = explode("|", trim($source, "{}"));
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$parts = array_map(trim, $parts);
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// Extract the name of the temaplate page
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$templatePagename = array_shift($parts);
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// If the page that we are supposed to use as the tempalte doesn't
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// exist, then there's no point in continuing.
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if(empty($pageindex->$templatePagename))
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return false;
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// Parse the parameters
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$this->maxParamDepth++;
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$params = [];
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$i = 0;
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foreach($parts as $part)
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{
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if(strpos($part, "=") !== false)
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{
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// This param contains an equals sign, so it's a named parameter
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$keyValuePair = explode("=", $part, 2);
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$keyValuePair = array_map(trim, $keyValuePair);
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$params[$keyValuePair[0]] = $keyValuePair[1];
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}
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else
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{
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// This isn't a named parameter
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$params["$i"] = trim($part);
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$i++;
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}
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}
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// Add the parsed parameters to the parameter stack
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$this->paramStack[] = [
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"pagename" => $templatePagename,
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"params" => $params
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];
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$templateFilePath = $paths->storage_prefix . $pageindex->$templatePagename->filename;
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$parsedTemplateSource = $this->text(file_get_contents($templateFilePath));
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// Remove the parsed parameters from the stack
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array_pop($this->paramStack);
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return [
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"name" => "div",
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"text" => $parsedTemplateSource,
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"attributes" => [
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"class" => "template"
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]
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];
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}
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protected function inlineInternalLink($fragment)
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{
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if(preg_match('/^\[\[(.*)\]\]/', $fragment["text"], $matches))
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{
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$display = $linkPage = $matches[1];
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if(strpos($matches[1], "|"))
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{
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// We have a bar character
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$parts = explode("|", $matches[1], 2);
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$linkPage = $parts[0];
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$display = $parts[1];
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}
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// Construct the full url
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$linkUrl = str_replace(
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"%s", rawurlencode($linkPage),
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$this->internalLinkBase
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);
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return [
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"extent" => strlen($matches[0]),
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"element" => [
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"name" => "a",
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"text" => $display,
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"attributes" => [
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"href" => $linkUrl
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]
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]
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];
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}
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return;
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}
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protected function inlineExtendedImage($fragment)
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{
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if(preg_match('/^!\[(.*)\]\(([^ |)]+)\s*\|([^|)]*)(?:\|([^)]*))?\)/', $fragment["text"], $matches))
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{
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/*
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* 0 - Everything
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* 1 - Alt text
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* 2 - Url
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* 3 - First param
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* 4 - Second Param (optional)
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*/
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var_dump($matches);
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$altText = $matches[1];
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$imageUrl = $matches[2];
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$param1 = strtolower(trim($matches[3]));
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$param2 = empty($matches[4]) ? false : strtolower(trim($matches[4]));
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$floatDirection = false;
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$imageSize = false;
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if($this->isFloatValue($param1))
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{
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$floatDirection = $param1;
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$imageSize = $this->parseSizeSpec($param2);
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}
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else if($this->isFloatValue($param2))
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{
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$floatDirection = $param2;
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$imageSize = $this->parseSizeSpec($param1);
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}
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else
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{
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$imageSize = $this->parseSizeSpec($param1);
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}
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// If they are both invalid then something very strange is going on
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// Let the built in parsedown image handler deal with it
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if($imageSize === false && $floatDirection === false)
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return;
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$style = "";
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if($imageSize !== false)
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$style .= " max-width: " . $imageSize["x"] . "px; max-height: " . $imageSize["y"] . "px;";
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if($floatDirection)
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$style .= " float: $floatDirection;";
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return [
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"extent" => strlen($matches[0]),
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"element" => [
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"name" => "img",
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"attributes" => [
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"src" => $imageUrl,
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"alt" => $altText,
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"style" => trim($style)
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]
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]
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];
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}
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}
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# ~
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# Utility Methods
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# ~
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private function isFloatValue($value)
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{
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return in_array(strtolower($value), [ "left", "right" ]);
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}
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private function parseSizeSpec($text)
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{
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if(strpos($text, "x") === false)
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return false;
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$parts = explode("x", $text, 2);
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if(count($parts) != 2)
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return false;
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array_map("trim", $parts);
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array_map("intval", $parts);
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if(in_array(0, $parts))
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return false;
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return [
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"x" => $parts[0],
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"y" => $parts[1]
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];
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}
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protected function escapeText($text)
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{
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return htmlentities($text, ENT_COMPAT | ENT_HTML5);
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}
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/**
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* Sets the base url to be used for internal links. '%s' will be replaced
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* with a URL encoded version of the page name.
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* @param string $url The url to use when parsing internal links.
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*/
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public function setInternalLinkBase($url)
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{
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$this->internalLinkBase = $url;
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}
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}
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?>
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