469 lines
12 KiB
PHP
Executable File
469 lines
12 KiB
PHP
Executable File
<?php
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/**
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* Parser wrapping the Markdown Extra parser.
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*
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* @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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const CODE_BLOCK_BACKTICK = 1;
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const CODE_BLOCK_COLON = 2;
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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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public static $api_link_base = 'http://api.silverstripe.org/search/lookup/?q=%s&version=%s&module=%s';
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/**
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* @var array
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*/
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public 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"
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* of the module. Necessary to rewrite relative
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* 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 || (!$page instanceof DocumentationPage)) {
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return false;
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}
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$md = $page->getMarkdown(true);
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// Pre-processing
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$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($md);
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$parser = new ParsedownExtra();
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return $parser->text($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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$inner = false;
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$mode = false;
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$end = false;
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$lines = explode("\n", $md);
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$output = array();
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foreach($lines as $i => $line) {
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// if line just contains whitespace, continue down the page.
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// Prevents code blocks with leading tabs adding an extra line.
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if(preg_match('/^\s$/', $line)) {
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continue;
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}
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if(!$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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$mode = self::CODE_BLOCK_COLON;
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$output[$i] = sprintf('<pre class="brush: %s">', (isset($matches[1])) ? $matches[1] : "");
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} else if(!$started && preg_match('/^\t*```\s*(.*)/', $line, $matches)) {
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$started = true;
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$mode = self::CODE_BLOCK_BACKTICK;
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$output[$i] = sprintf('<pre class="brush: %s">', (isset($matches[1])) ? $matches[1] : "");
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} else if($started && $mode == self::CODE_BLOCK_BACKTICK) {
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// inside a backtick fenced box
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if(preg_match('/^\t*```\s*/', $line, $matches)) {
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// end of the backtick fenced box. Unset the line that contains the backticks
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$end = true;
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}
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else {
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// still inside the line.
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$output[$i] = ($started) ? '' : '<pre>' . "\n";
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$output[$i] .= htmlentities($line, ENT_COMPAT, 'UTF-8');
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$inner = true;
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}
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} else if(preg_match('/^[\ ]{0,3}?[\t](.*)/', $line, $matches)) {
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// inner line of block, or first line of standard markdown code block
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// regex removes first tab (any following tabs are part of the code).
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$output[$i] = ($started) ? '' : '<pre>' . "\n";
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$output[$i] .= htmlentities($matches[1], ENT_COMPAT, 'UTF-8');
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$inner = true;
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$started = true;
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} else if($started && $inner && $mode == self::CODE_BLOCK_COLON && trim($line) === "") {
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// still inside a colon based block, if the line is only whitespace
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// then continue with with it. We can continue with it for now as
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// it'll be tidied up later in the $end section.
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$inner = true;
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$output[$i] = $line;
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} else if($started && $inner) {
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// line contains something other than whitespace, or tabbed. E.g
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// > code
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// > \n
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// > some message
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//
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// So actually want to reset $i to the line before this new line
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// and include this line. The edge case where this will fail is
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// new the following segment contains a code block as well as it
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// will not open.
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$end = true;
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$output[$i] = $line;
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$i = $i -1;
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} else {
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$output[$i] = $line;
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}
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if($end) {
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$output = self::finalize_code_output($i, $output);
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// reset state
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$started = $inner = $mode = $end = false;
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}
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}
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if($started) {
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$output = self::finalize_code_output($i, $output);
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}
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return join("\n", $output);
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}
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/**
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* @param int
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* @param array
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*
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* @return array
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*/
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private static function finalize_code_output($i, $output) {
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$j = $i;
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while(isset($output[$j]) && trim($output[$j]) === "") {
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unset($output[$j]);
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$j--;
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}
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if(isset($output[$j])) {
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$output[$j] .= "</pre>\n";
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}
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else {
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$output[$j] = "</pre>\n\n";
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}
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return $output;
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}
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public static function rewrite_image_links($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) {
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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'])) {
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continue;
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}
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// Rewrite URL (relative or absolute)
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$baselink = Director::makeRelative(
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dirname($page->getPath())
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);
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// if the image starts with a slash, it's absolute
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if(substr($url, 0, 1) == '/') {
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$relativeUrl = str_replace(BASE_PATH, '', Controller::join_links(
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$page->getEntity()->getPath(),
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$url
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));
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} else {
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$relativeUrl = rtrim($baselink, '/') . '/' . ltrim($url, '/');
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}
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// Resolve relative paths
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while(strpos($relativeUrl, '/..') !== FALSE) {
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$relativeUrl = preg_replace('/\w+\/\.\.\//', '', $relativeUrl);
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}
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// Make it absolute again
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$absoluteUrl = Controller::join_links(
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Director::absoluteBaseURL(),
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$relativeUrl
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);
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// Replace any double slashes (apart from protocol)
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// $absoluteUrl = preg_replace('/([^:])\/{2,}/', '$1/', $absoluteUrl);
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// Replace in original content
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$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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}
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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 $page
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* @return String
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*/
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public static function rewrite_api_links($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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$url = sprintf(
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self::$api_link_base,
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$subject,
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$page->getVersion(),
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$page->getEntity()->getKey()
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);
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$md = str_replace(
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$match,
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sprintf('<code>[%s](%s)</code>', $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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$url = sprintf(
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self::$api_link_base,
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$subject,
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$page->getVersion(),
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$page->getEntity()->getKey()
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);
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$md = str_replace(
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$match,
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sprintf('<code>[%s](%s)</code>', $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 $md;
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}
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/**
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*
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*/
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public static function _rewrite_heading_anchors_callback($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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public 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 $page
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*
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* @return String Markdown
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*/
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public static function rewrite_relative_links($md, $page) {
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$baselink = $page->getEntity()->Link();
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$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 == '.') {
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$relativePath = '';
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}
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// file base link
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$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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}
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