350 lines
9.2 KiB
PHP
Executable File
350 lines
9.2 KiB
PHP
Executable File
<?php
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/**
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* Parser wrapping the Markdown Extra parser (see http://michelf.com/projects/php-markdown/extra/).
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*
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* @package docsviewer
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*/
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class DocumentationParser {
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/**
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* @var String Rewriting of api links in the format "[api:MyClass]" or "[api:MyClass::$my_property]".
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*/
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static $api_link_base = 'http://api.silverstripe.org/search/lookup/?q=%s&version=%s&module=%s';
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static $heading_counts = array();
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/**
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* Parse a given path to the documentation for a file. Performs a case
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* insensitive lookup on the file system. Automatically appends the file
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* extension to one of the markdown extensions as well so /install/ in a
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* web browser will match /install.md or /INSTALL.md
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*
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* Filepath: /var/www/myproject/src/cms/en/folder/subfolder/page.md
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* URL: http://myhost/mywebroot/dev/docs/2.4/cms/en/folder/subfolder/page
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* Webroot: http://myhost/mywebroot/
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* Baselink: dev/docs/2.4/cms/en/
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* Pathparts: folder/subfolder/page
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*
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* @param DocumentationPage $page
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* @param String $baselink Link relative to webroot, up until the "root" of the module.
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* Necessary to rewrite relative links
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*
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* @return String
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*/
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public static function parse(DocumentationPage $page, $baselink = null) {
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if(!$page || (!$page instanceof DocumentationPage)) return false;
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$md = $page->getMarkdown();
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// Pre-processing
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$md = self::rewrite_image_links($md, $page);
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$md = self::rewrite_relative_links($md, $page, $baselink);
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$md = self::rewrite_api_links($md, $page);
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$md = self::rewrite_heading_anchors($md, $page);
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$md = self::rewrite_code_blocks($md);
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require_once(DOCSVIEWER_PATH .'/thirdparty/markdown/markdown.php');
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$parser = new MarkdownExtra_Parser();
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$parser->no_markup = true;
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return $parser->transform($md);
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}
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public static function rewrite_code_blocks($md) {
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$started = false;
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$inner = false;
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$lines = explode("\n", $md);
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foreach($lines as $i => $line) {
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if(!$started && preg_match('/^\t*:::\s*(.*)/', $line, $matches)) {
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// first line with custom formatting
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$started = true;
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$lines[$i] = sprintf('<pre class="brush: %s">', $matches[1]);
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} elseif(preg_match('/^\t(.*)/', $line, $matches)) {
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// inner line of ::: block, or first line of standard markdown code block
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// regex removes first tab (any following tabs are part of the code).
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$lines[$i] = ($started) ? '' : '<pre>' . "\n";
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$lines[$i] .= htmlentities($matches[1], ENT_COMPAT, 'UTF-8');
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$inner = true;
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$started = true;
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} elseif($started && $inner) {
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// remove any previous blank lines
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$j = $i-1;
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while(isset($lines[$j]) && preg_match('/^[\t\s]*$/', $lines[$j])) {
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unset($lines[$j]);
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$j--;
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}
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// last line, close pre
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$lines[$i] = '</pre>' . "\n\n" . $line;
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// reset state
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$started = $inner = false;
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}
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}
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return join("\n", $lines);
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}
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static function rewrite_image_links($md, $page) {
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// Links with titles
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$re = '/
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!
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\[
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(.*?) # image title (non greedy)
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\]
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\(
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(.*?) # image url (non greedy)
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\)
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/x';
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preg_match_all($re, $md, $images);
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if($images) foreach($images[0] as $i => $match) {
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$title = $images[1][$i];
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$url = $images[2][$i];
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// Don't process absolute links (based on protocol detection)
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$urlParts = parse_url($url);
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if($urlParts && isset($urlParts['scheme'])) continue;
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// Rewrite URL (relative or absolute)
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$baselink = Director::makeRelative(dirname($page->getPath()));
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$relativeUrl = rtrim($baselink, '/') . '/' . ltrim($url, '/');
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// Resolve relative paths
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while(strpos($relativeUrl, '/..') !== FALSE) {
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$relativeUrl = preg_replace('/\w+\/\.\.\//', '', $relativeUrl);
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}
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// Replace any double slashes (apart from protocol)
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$relativeUrl = preg_replace('/([^:])\/{2,}/', '$1/', $relativeUrl);
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// Make it absolute again
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$absoluteUrl = Director::absoluteBaseURL() . $relativeUrl;
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// Replace in original content
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$md = str_replace(
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$match,
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sprintf('', $title, $absoluteUrl),
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$md
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);
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}
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return $md;
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}
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/**
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* Rewrite links with special "api:" prefix, from two possible formats:
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* 1. [api:DataObject]
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* 2. (My Title)(api:DataObject)
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*
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* Hack: Replaces any backticks with "<code>" blocks,
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* as the currently used markdown parser doesn't resolve links in backticks,
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* but does resolve in "<code>" blocks.
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*
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* @param String $md
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* @param DocumentationPage $page
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* @return String
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*/
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static function rewrite_api_links($md, $page) {
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// Links with titles
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$re = '/
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`?
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\[
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(.*?) # link title (non greedy)
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\]
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\(
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api:(.*?) # link url (non greedy)
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\)
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`?
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/x';
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preg_match_all($re, $md, $linksWithTitles);
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if($linksWithTitles) {
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foreach($linksWithTitles[0] as $i => $match) {
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$title = $linksWithTitles[1][$i];
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$subject = $linksWithTitles[2][$i];
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$url = sprintf(self::$api_link_base, $subject, $page->getVersion(), $page->getEntity()->getFolder());
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$md = str_replace(
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$match,
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sprintf('[%s](%s)', $title, $url),
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$md
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);
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}
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}
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// Bare links
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$re = '/
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`?
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\[
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api:(.*?)
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\]
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`?
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/x';
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preg_match_all($re, $md, $links);
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if($links) {
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foreach($links[0] as $i => $match) {
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$subject = $links[1][$i];
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$url = sprintf(self::$api_link_base, $subject, $page->getVersion(), $page->getEntity()->getFolder());
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$md = str_replace(
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$match,
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sprintf('[%s](%s)', $subject, $url),
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$md
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);
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}
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}
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return $md;
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}
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/**
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*
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*/
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public static function rewrite_heading_anchors($md, $page) {
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$re = '/^\#+(.*)/m';
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$md = preg_replace_callback($re, array('DocumentationParser', '_rewrite_heading_anchors_callback'), $md);
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return $md;
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}
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public static function _rewrite_heading_anchors_callback($matches) {
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$heading = $matches[0];
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$headingText = $matches[1];
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if(preg_match('/\{\#.*\}/', $headingText)) return $heading;
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if(!isset(self::$heading_counts[$headingText])) {
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self::$heading_counts[$headingText] = 1;
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}
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else {
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self::$heading_counts[$headingText]++;
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$headingText .= "-" . self::$heading_counts[$headingText];
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}
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return sprintf("%s {#%s}", preg_replace('/\n/', '', $heading), self::generate_html_id($headingText));
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}
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/**
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* Generate an html element id from a string
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*
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* @return String
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*/
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static function generate_html_id($title) {
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$t = $title;
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$t = str_replace('&','-and-',$t);
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$t = str_replace('&','-and-',$t);
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$t = preg_replace('/[^A-Za-z0-9]+/','-',$t);
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$t = preg_replace('/-+/','-',$t);
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$t = trim($t, '-');
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$t = strtolower($t);
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return $t;
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}
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/**
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* Resolves all relative links within markdown.
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*
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* @param String $md Markdown content
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* @param DocumentationPage $page
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* @param String $baselink
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* @return String Markdown
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*/
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static function rewrite_relative_links($md, $page, $baselink = null) {
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if(!$baselink) $baselink = $page->getEntity()->getRelativeLink();
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$re = '/
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([^\!]?) # exclude image format
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\[
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(.*?) # link title (non greedy)
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\]
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\(
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(.*?) # link url (non greedy)
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\)
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/x';
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preg_match_all($re, $md, $matches);
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// relative path (relative to module base folder), without the filename.
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// For "sapphire/en/current/topics/templates", this would be "templates"
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$relativePath = dirname($page->getRelativePath());
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if($relativePath == '.') $relativePath = '';
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// file base link
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$fileBaseLink = Director::makeRelative(dirname($page->getPath()));
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if($matches) {
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foreach($matches[0] as $i => $match) {
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$title = $matches[2][$i];
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$url = $matches[3][$i];
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// Don't process API links
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if(preg_match('/^api:/', $url)) continue;
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// Don't process absolute links (based on protocol detection)
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$urlParts = parse_url($url);
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if($urlParts && isset($urlParts['scheme'])) continue;
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// for images we need to use the file base path
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if(preg_match('/_images/', $url)) {
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$relativeUrl = Controller::join_links(
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Director::absoluteBaseURL(),
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$fileBaseLink,
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$url
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);
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}
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else {
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// Rewrite public URL
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if(preg_match('/^\//', $url)) {
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// Absolute: Only path to module base
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$relativeUrl = Controller::join_links($baselink, $url);
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} else {
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// Relative: Include path to module base and any folders
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$relativeUrl = Controller::join_links($baselink, $relativePath, $url);
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}
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}
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// Resolve relative paths
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while(strpos($relativeUrl, '..') !== FALSE) {
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$relativeUrl = preg_replace('/\w+\/\.\.\//', '', $relativeUrl);
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}
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// Replace any double slashes (apart from protocol)
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$relativeUrl = preg_replace('/([^:])\/{2,}/', '$1/', $relativeUrl);
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// Replace in original content
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$md = str_replace(
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$match,
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sprintf('%s[%s](%s)', $matches[1][$i], $title, $relativeUrl),
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$md
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);
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}
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}
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return $md;
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}
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/**
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* Strips out the metadata for a page
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*
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* @param DocumentationPage
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*/
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public static function retrieve_meta_data(DocumentationPage &$page) {
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if($md = $page->getMarkdown()) {
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$matches = preg_match_all('/
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(?<key>[A-Za-z0-9_-]+):
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\s*
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(?<value>.*)
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/x', $md, $meta);
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if($matches) {
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foreach($meta['key'] as $index => $key) {
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if(isset($meta['value'][$index])) {
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$page->setMetaData($key, $meta['value'][$index]);
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}
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}
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}
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}
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}
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} |