1989 lines
55 KiB
PHP
1989 lines
55 KiB
PHP
<?php
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#
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# PHP Markdown Extra - A text-to-HTML conversion tool for web writers
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#
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# Copyright (c) 2004-2005 Michel Fortin
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# <http://www.michelf.com/projects/php-markdown/>
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#
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# Based on Markdown
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# Copyright (c) 2004-2005 John Gruber
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# <http://daringfireball.net/projects/markdown/>
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#
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global $MarkdownPHPVersion, $MarkdownSyntaxVersion,
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$md_empty_element_suffix, $md_tab_width,
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$md_nested_brackets_depth, $md_nested_brackets,
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$md_escape_table, $md_backslash_escape_table,
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$md_list_level;
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$MarkdownPHPVersion = 'Extra 1.0'; # Mon 5 Sep 2005
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$MarkdownSyntaxVersion = '1.0.1'; # Sun 12 Dec 2004
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#
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# Global default settings:
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#
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$md_empty_element_suffix = " />"; # Change to ">" for HTML output
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$md_tab_width = 4;
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#
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# WordPress settings:
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#
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$md_wp_posts = true; # Set to false to remove Markdown from posts.
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$md_wp_comments = true; # Set to false to remove Markdown from comments.
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# -- WordPress Plugin Interface -----------------------------------------------
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/*
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Plugin Name: PHP Markdown Extra
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Plugin URI: http://www.michelf.com/projects/php-markdown/
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Description: <a href="http://daringfireball.net/projects/markdown/syntax">Markdown syntax</a> allows you to write using an easy-to-read, easy-to-write plain text format. Based on the original Perl version by <a href="http://daringfireball.net/">John Gruber</a>. <a href="http://www.michelf.com/projects/php-markdown/">More...</a>
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Version: Extra 1.0
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Author: Michel Fortin
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Author URI: http://www.michelf.com/
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*/
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if (isset($wp_version)) {
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# More details about how it works here:
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# <http://www.michelf.com/weblog/2005/wordpress-text-flow-vs-markdown/>
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# Post content and excerpts
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if ($md_wp_posts) {
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remove_filter('the_content', 'wpautop');
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remove_filter('the_excerpt', 'wpautop');
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add_filter('the_content', 'Markdown', 6);
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add_filter('get_the_excerpt', 'Markdown', 6);
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add_filter('get_the_excerpt', 'trim', 7);
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add_filter('the_excerpt', 'md_add_p');
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add_filter('the_excerpt_rss', 'md_strip_p');
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remove_filter('content_save_pre', 'balanceTags', 50);
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remove_filter('excerpt_save_pre', 'balanceTags', 50);
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add_filter('the_content', 'balanceTags', 50);
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add_filter('get_the_excerpt', 'balanceTags', 9);
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function md_add_p($text) {
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if (strlen($text) == 0) return;
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if (strcasecmp(substr($text, -3), '<p>') == 0) return $text;
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return '<p>'.$text.'</p>';
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}
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function md_strip_p($t) { return preg_replace('{</?[pP]>}', '', $t); }
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}
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# Comments
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if ($md_wp_comments) {
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remove_filter('comment_text', 'wpautop');
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remove_filter('comment_text', 'make_clickable');
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add_filter('pre_comment_content', 'Markdown', 6);
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add_filter('pre_comment_content', 'md_hide_tags', 8);
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add_filter('pre_comment_content', 'md_show_tags', 12);
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add_filter('get_comment_text', 'Markdown', 6);
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add_filter('get_comment_excerpt', 'Markdown', 6);
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add_filter('get_comment_excerpt', 'md_strip_p', 7);
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global $md_hidden_tags;
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$md_hidden_tags = array(
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'<p>' => md5('<p>'), '</p>' => md5('</p>'),
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'<pre>' => md5('<pre>'), '</pre>'=> md5('</pre>'),
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'<ol>' => md5('<ol>'), '</ol>' => md5('</ol>'),
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'<ul>' => md5('<ul>'), '</ul>' => md5('</ul>'),
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'<li>' => md5('<li>'), '</li>' => md5('</li>'),
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);
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function md_hide_tags($text) {
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global $md_hidden_tags;
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return str_replace(array_keys($md_hidden_tags),
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array_values($md_hidden_tags), $text);
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}
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function md_show_tags($text) {
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global $md_hidden_tags;
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return str_replace(array_values($md_hidden_tags),
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array_keys($md_hidden_tags), $text);
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}
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}
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}
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# -- bBlog Plugin Info --------------------------------------------------------
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function identify_modifier_markdown() {
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global $MarkdownPHPVersion;
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return array(
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'name' => 'markdown',
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'type' => 'modifier',
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'nicename' => 'PHP Markdown Extra',
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'description' => 'A text-to-HTML conversion tool for web writers',
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'authors' => 'Michel Fortin and John Gruber',
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'licence' => 'GPL',
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'version' => $MarkdownPHPVersion,
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'help' => '<a href="http://daringfireball.net/projects/markdown/syntax">Markdown syntax</a> allows you to write using an easy-to-read, easy-to-write plain text format. Based on the original Perl version by <a href="http://daringfireball.net/">John Gruber</a>. <a href="http://www.michelf.com/projects/php-markdown/">More...</a>'
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);
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}
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# -- Smarty Modifier Interface ------------------------------------------------
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function smarty_modifier_markdown($text) {
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return Markdown($text);
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}
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# -- Textile Compatibility Mode -----------------------------------------------
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# Rename this file to "classTextile.php" and it can replace Textile anywhere.
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if (strcasecmp(substr(__FILE__, -16), "classTextile.php") == 0) {
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# Try to include PHP SmartyPants. Should be in the same directory.
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@include_once 'smartypants.php';
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# Fake Textile class. It calls Markdown instead.
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class Textile {
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function TextileThis($text, $lite='', $encode='', $noimage='', $strict='') {
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if ($lite == '' && $encode == '') $text = Markdown($text);
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if (function_exists('SmartyPants')) $text = SmartyPants($text);
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return $text;
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}
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}
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}
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#
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# Globals:
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#
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# Regex to match balanced [brackets].
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# Needed to insert a maximum bracked depth while converting to PHP.
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$md_nested_brackets_depth = 6;
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$md_nested_brackets =
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str_repeat('(?>[^\[\]]+|\[', $md_nested_brackets_depth).
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str_repeat('\])*', $md_nested_brackets_depth);
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# Table of hash values for escaped characters:
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$md_escape_table = array(
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"\\" => md5("\\"),
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"`" => md5("`"),
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"*" => md5("*"),
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"_" => md5("_"),
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"{" => md5("{"),
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"}" => md5("}"),
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"[" => md5("["),
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"]" => md5("]"),
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"(" => md5("("),
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")" => md5(")"),
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">" => md5(">"),
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"#" => md5("#"),
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"+" => md5("+"),
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"-" => md5("-"),
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"." => md5("."),
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"!" => md5("!"),
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":" => md5(":"),
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"|" => md5("|"),
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);
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# Create an identical table but for escaped characters.
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$md_backslash_escape_table;
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foreach ($md_escape_table as $key => $char)
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$md_backslash_escape_table["\\$key"] = $char;
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function Markdown($text) {
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#
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# Main function. The order in which other subs are called here is
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# essential. Link and image substitutions need to happen before
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# _EscapeSpecialCharsWithinTagAttributes(), so that any *'s or _'s in the <a>
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# and <img> tags get encoded.
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#
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# Clear the global hashes. If we don't clear these, you get conflicts
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# from other articles when generating a page which contains more than
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# one article (e.g. an index page that shows the N most recent
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# articles):
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global $md_urls, $md_titles, $md_html_blocks, $md_html_hashes;
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$md_urls = array();
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$md_titles = array();
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$md_html_blocks = array();
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$md_html_hashes = array();
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# Standardize line endings:
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# DOS to Unix and Mac to Unix
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$text = str_replace(array("\r\n", "\r"), "\n", $text);
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# Make sure $text ends with a couple of newlines:
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$text .= "\n\n";
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# Convert all tabs to spaces.
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$text = _Detab($text);
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# Turn block-level HTML blocks into hash entries
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$text = _HashHTMLBlocks($text);
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# Strip any lines consisting only of spaces and tabs.
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# This makes subsequent regexen easier to write, because we can
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# match consecutive blank lines with /\n+/ instead of something
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# contorted like /[ \t]*\n+/ .
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$text = preg_replace('/^[ \t]+$/m', '', $text);
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# Strip link definitions, store in hashes.
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$text = _StripLinkDefinitions($text);
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$text = _RunBlockGamut($text, FALSE);
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$text = _UnescapeSpecialChars($text);
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return $text . "\n";
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}
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function _StripLinkDefinitions($text) {
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#
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# Strips link definitions from text, stores the URLs and titles in
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# hash references.
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#
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global $md_tab_width;
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$less_than_tab = $md_tab_width - 1;
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# Link defs are in the form: ^[id]: url "optional title"
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$text = preg_replace_callback('{
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^[ ]{0,'.$less_than_tab.'}\[(.+)\]: # id = $1
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[ \t]*
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\n? # maybe *one* newline
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[ \t]*
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<?(\S+?)>? # url = $2
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[ \t]*
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\n? # maybe one newline
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[ \t]*
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(?:
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(?<=\s) # lookbehind for whitespace
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["(]
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(.+?) # title = $3
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[")]
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[ \t]*
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)? # title is optional
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(?:\n+|\Z)
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}xm',
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'_StripLinkDefinitions_callback',
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$text);
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return $text;
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}
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function _StripLinkDefinitions_callback($matches) {
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global $md_urls, $md_titles;
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$link_id = strtolower($matches[1]);
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$md_urls[$link_id] = _EncodeAmpsAndAngles($matches[2]);
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if (isset($matches[3]))
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$md_titles[$link_id] = str_replace('"', '"', $matches[3]);
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return ''; # String that will replace the block
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}
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function _HashHTMLBlocks($text) {
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#
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# Hashify HTML Blocks and "clean tags".
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#
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# We only want to do this for block-level HTML tags, such as headers,
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# lists, and tables. That's because we still want to wrap <p>s around
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# "paragraphs" that are wrapped in non-block-level tags, such as anchors,
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# phrase emphasis, and spans. The list of tags we're looking for is
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# hard-coded.
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#
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# This works by calling _HashHTMLBlocks_InMarkdown, which then calls
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# _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1"
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# attribute is found whitin a tag, _HashHTMLBlocks_InHTML calls back
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# _HashHTMLBlocks_InMarkdown to handle the Markdown syntax within the tag.
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# These two functions are calling each other. It's recursive!
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#
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global $block_tags, $context_block_tags, $contain_span_tags,
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$clean_tags, $auto_close_tags;
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# Tags that are always treated as block tags:
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$block_tags = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|'.
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'form|fieldset|iframe|hr|legend';
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# Tags treated as block tags only if the opening tag is alone on it's line:
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$context_block_tags = 'script|noscript|math|ins|del';
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# Tags where markdown="1" default to span mode:
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$contain_span_tags = 'p|h[1-6]|li|dd|dt|td|th|legend';
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# Tags which must not have their contents modified, no matter where
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# they appear:
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$clean_tags = 'script|math';
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# Tags that do not need to be closed.
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$auto_close_tags = 'hr|img';
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# Regex to match any tag.
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global $tag_match;
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$tag_match =
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'{
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( # $2: Capture hole tag.
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</? # Any opening or closing tag.
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[\w:$]+ # Tag name.
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\s* # Whitespace.
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(?:
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".*?" | # Double quotes (can contain `>`)
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\'.*?\' | # Single quotes (can contain `>`)
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.+? # Anything but quotes and `>`.
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)*?
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> # End of tag.
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<!-- .*? --> # HTML Comment
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<\? .*? \?> # Processing instruction
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<!\[CDATA\[.*?\]\]> # CData Block
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)
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}xs';
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#
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# Call the HTML-in-Markdown hasher.
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#
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list($text, ) = _HashHTMLBlocks_InMarkdown($text);
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return $text;
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}
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function _HashHTMLBlocks_InMarkdown($text, $indent = 0,
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$enclosing_tag = '', $md_span = false)
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{
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#
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# Parse markdown text, calling _HashHTMLBlocks_InHTML for block tags.
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#
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# * $indent is the number of space to be ignored when checking for code
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# blocks. This is important because if we don't take the indent into
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# account, something like this (which looks right) won't work as expected:
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#
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# <div>
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# <div markdown="1">
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# Hello World. <-- Is this a Markdown code block or text?
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# </div> <-- Is this a Markdown code block or a real tag?
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# <div>
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#
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# If you don't like this, just don't indent the tag on which
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# you apply the markdown="1" attribute.
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#
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# * If $enclosing_tag is not empty, stops at the first unmatched closing
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# tag with that name. Nested tags supported.
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#
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# * If $md_span is true, text inside must treated as span. So any double
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# newline will be replaced by a single newline so that it does not create
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# paragraphs.
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#
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# Returns an array of that form: ( processed text , remaining text )
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#
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global $block_tags, $context_block_tags, $clean_tags, $auto_close_tags,
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$tag_match;
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if ($text === '') return array('', '');
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# Regex to check for the presense of newlines around a block tag.
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$newline_match_before = "/(?:^\n?|\n\n) *$/";
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$newline_match_after =
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'{
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^ # Start of text following the tag.
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(?:[ ]*<!--.*?-->)? # Optional comment.
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[ ]*\n # Must be followed by newline.
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}xs';
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# Regex to match any tag.
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$block_tag_match =
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'{
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( # $2: Capture hole tag.
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</? # Any opening or closing tag.
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(?: # Tag name.
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'.$block_tags.' |
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'.$context_block_tags.' |
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'.$clean_tags.' |
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(?!\s)'.$enclosing_tag.'
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)
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\s* # Whitespace.
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(?:
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".*?" | # Double quotes (can contain `>`)
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\'.*?\' | # Single quotes (can contain `>`)
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.+? # Anything but quotes and `>`.
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)*?
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> # End of tag.
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<!-- .*? --> # HTML Comment
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<\? .*? \?> # Processing instruction
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<!\[CDATA\[.*?\]\]> # CData Block
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)
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}xs';
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$depth = 0; # Current depth inside the tag tree.
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$parsed = ""; # Parsed text that will be returned.
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#
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# Loop through every tag until we find the closing tag of the parent
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# or loop until reaching the end of text if no parent tag specified.
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#
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do {
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#
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# Split the text using the first $tag_match pattern found.
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# Text before pattern will be first in the array, text after
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# pattern will be at the end, and between will be any catches made
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# by the pattern.
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#
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$parts = preg_split($block_tag_match, $text, 2,
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PREG_SPLIT_DELIM_CAPTURE);
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# If in Markdown span mode, replace any multiple newlines that would
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# trigger a new paragraph.
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if ($md_span) {
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$parts[0] = preg_replace('/\n\n/', "\n", $parts[0]);
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}
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$parsed .= $parts[0]; # Text before current tag.
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# If end of $text has been reached. Stop loop.
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if (count($parts) < 3) {
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$text = "";
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break;
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}
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$tag = $parts[1]; # Tag to handle.
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$text = $parts[2]; # Remaining text after current tag.
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#
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# Check for: Tag inside code block or span
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#
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if (# Find current paragraph
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preg_match('/(?>^\n?|\n\n)((?>.\n?)+?)$/', $parsed, $matches) &&
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(
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# Then match in it either a code block...
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preg_match('/^ {'.($indent+4).'}.*(?>\n {'.($indent+4).'}.*)*'.
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'(?!\n)$/', $matches[1], $x) ||
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# ...or unbalenced code span markers. (the regex matches balenced)
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!preg_match('/^(?>[^`]+|(`+)(?>[^`]+|(?!\1[^`])`)*?\1(?!`))*$/s',
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$matches[1])
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))
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{
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# Tag is in code block or span and may not be a tag at all. So we
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# simply skip the first char (should be a `<`).
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$parsed .= $tag{0};
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$text = substr($tag, 1) . $text; # Put back $tag minus first char.
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}
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#
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# Check for: Opening Block level tag or
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# Opening Content Block tag (like ins and del)
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# used as a block tag (tag is alone on it's line).
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#
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else if (preg_match("{^<(?:$block_tags)\b}", $tag) ||
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( preg_match("{^<(?:$context_block_tags)\b}", $tag) &&
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preg_match($newline_match_before, $parsed) &&
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preg_match($newline_match_after, $text) )
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)
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{
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# Need to parse tag and following text using the HTML parser.
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list($block_text, $text) =
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_HashHTMLBlocks_InHTML($tag . $text,
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"_HashHTMLBlocks_HashBlock", TRUE);
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# Make sure it stays outside of any paragraph by adding newlines.
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$parsed .= "\n\n$block_text\n\n";
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}
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#
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# Check for: Clean tag (like script, math)
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# HTML Comments, processing instructions.
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#
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else if (preg_match("{^<(?:$clean_tags)\b}", $tag) ||
|
|
$tag{1} == '!' || $tag{1} == '?')
|
|
{
|
|
# Need to parse tag and following text using the HTML parser.
|
|
# (don't check for markdown attribute)
|
|
list($block_text, $text) =
|
|
_HashHTMLBlocks_InHTML($tag . $text,
|
|
"_HashHTMLBlocks_HashClean", FALSE);
|
|
|
|
$parsed .= $block_text;
|
|
}
|
|
#
|
|
# Check for: Tag with same name as enclosing tag.
|
|
#
|
|
else if ($enclosing_tag !== '' &&
|
|
# Same name as enclosing tag.
|
|
preg_match("{^</?(?:$enclosing_tag)\b}", $tag))
|
|
{
|
|
#
|
|
# Increase/decrease nested tag count.
|
|
#
|
|
if ($tag{1} == '/') $depth--;
|
|
else if ($tag{strlen($tag)-2} != '/') $depth++;
|
|
|
|
if ($depth < 0) {
|
|
#
|
|
# Going out of parent element. Clean up and break so we
|
|
# return to the calling function.
|
|
#
|
|
$text = $tag . $text;
|
|
break;
|
|
}
|
|
|
|
$parsed .= $tag;
|
|
}
|
|
else {
|
|
$parsed .= $tag;
|
|
}
|
|
} while ($depth >= 0);
|
|
|
|
return array($parsed, $text);
|
|
}
|
|
function _HashHTMLBlocks_InHTML($text, $hash_function, $md_attr) {
|
|
#
|
|
# Parse HTML, calling _HashHTMLBlocks_InMarkdown for block tags.
|
|
#
|
|
# * Calls $hash_function to convert any blocks.
|
|
# * Stops when the first opening tag closes.
|
|
# * $md_attr indicate if the use of the `markdown="1"` attribute is allowed.
|
|
# (it is not inside clean tags)
|
|
#
|
|
# Returns an array of that form: ( processed text , remaining text )
|
|
#
|
|
global $auto_close_tags, $contain_span_tags, $tag_match;
|
|
|
|
if ($text === '') return array('', '');
|
|
|
|
# Regex to match `markdown` attribute inside of a tag.
|
|
$markdown_attr_match = '
|
|
{
|
|
\s* # Eat whitespace before the `markdown` attribute
|
|
markdown
|
|
\s*=\s*
|
|
(["\']) # $1: quote delimiter
|
|
(.*?) # $2: attribute value
|
|
\1 # matching delimiter
|
|
}xs';
|
|
|
|
$original_text = $text; # Save original text in case of faliure.
|
|
|
|
$depth = 0; # Current depth inside the tag tree.
|
|
$block_text = ""; # Temporary text holder for current text.
|
|
$parsed = ""; # Parsed text that will be returned.
|
|
|
|
#
|
|
# Get the name of the starting tag.
|
|
#
|
|
if (preg_match("/^<([\w:$]*)\b/", $text, $matches))
|
|
$base_tag_name = $matches[1];
|
|
|
|
#
|
|
# Loop through every tag until we find the corresponding closing tag.
|
|
#
|
|
do {
|
|
#
|
|
# Split the text using the first $tag_match pattern found.
|
|
# Text before pattern will be first in the array, text after
|
|
# pattern will be at the end, and between will be any catches made
|
|
# by the pattern.
|
|
#
|
|
$parts = preg_split($tag_match, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
|
|
|
|
if (count($parts) < 3) {
|
|
#
|
|
# End of $text reached with unbalenced tag(s).
|
|
# In that case, we return original text unchanged and pass the
|
|
# first character as filtered to prevent an infinite loop in the
|
|
# parent function.
|
|
#
|
|
return array($original_text{0}, substr($original_text, 1));
|
|
}
|
|
|
|
$block_text .= $parts[0]; # Text before current tag.
|
|
$tag = $parts[1]; # Tag to handle.
|
|
$text = $parts[2]; # Remaining text after current tag.
|
|
|
|
#
|
|
# Check for: Auto-close tag (like <hr/>)
|
|
# Comments and Processing Instructions.
|
|
#
|
|
if (preg_match("{^</?(?:$auto_close_tags)\b}", $tag) ||
|
|
$tag{1} == '!' || $tag{1} == '?')
|
|
{
|
|
# Just add the tag to the block as if it was text.
|
|
$block_text .= $tag;
|
|
}
|
|
else {
|
|
#
|
|
# Increase/decrease nested tag count. Only do so if
|
|
# the tag's name match base tag's.
|
|
#
|
|
if (preg_match("{^</?$base_tag_name\b}", $tag)) {
|
|
if ($tag{1} == '/') $depth--;
|
|
else if ($tag{strlen($tag)-2} != '/') $depth++;
|
|
}
|
|
|
|
#
|
|
# Check for `markdown="1"` attribute and handle it.
|
|
#
|
|
if ($md_attr &&
|
|
preg_match($markdown_attr_match, $tag, $attr_matches) &&
|
|
preg_match('/^(?:1|block|span)$/', $attr_matches[2]))
|
|
{
|
|
# Remove `markdown` attribute from opening tag.
|
|
$tag = preg_replace($markdown_attr_match, '', $tag);
|
|
|
|
# Check if text inside this tag must be parsed in span mode.
|
|
$md_mode = $attr_matches[2];
|
|
$span_mode = $md_mode == 'span' || $md_mode != 'block' &&
|
|
preg_match("{^<(?:$contain_span_tags)\b}", $tag);
|
|
|
|
# Calculate indent before tag.
|
|
preg_match('/(?:^|\n)( *?)(?! ).*?$/', $block_text, $matches);
|
|
$indent = strlen($matches[1]);
|
|
|
|
# End preceding block with this tag.
|
|
$block_text .= $tag;
|
|
$parsed .= $hash_function($block_text, $span_mode);
|
|
|
|
# Get enclosing tag name for the ParseMarkdown function.
|
|
preg_match('/^<([\w:$]*)\b/', $tag, $matches);
|
|
$tag_name = $matches[1];
|
|
|
|
# Parse the content using the HTML-in-Markdown parser.
|
|
list ($block_text, $text)
|
|
= _HashHTMLBlocks_InMarkdown($text, $indent,
|
|
$tag_name, $span_mode);
|
|
|
|
# Outdent markdown text.
|
|
if ($indent > 0) {
|
|
$block_text = preg_replace("/^[ ]{1,$indent}/m", "",
|
|
$block_text);
|
|
}
|
|
|
|
# Append tag content to parsed text.
|
|
if (!$span_mode) $parsed .= "\n\n$block_text\n\n";
|
|
else $parsed .= "$block_text";
|
|
|
|
# Start over a new block.
|
|
$block_text = "";
|
|
}
|
|
else $block_text .= $tag;
|
|
}
|
|
|
|
} while ($depth > 0);
|
|
|
|
#
|
|
# Hash last block text that wasn't processed inside the loop.
|
|
#
|
|
$parsed .= $hash_function($block_text);
|
|
|
|
return array($parsed, $text);
|
|
}
|
|
function _HashHTMLBlocks_HashBlock($text) {
|
|
global $md_html_hashes, $md_html_blocks;
|
|
$key = md5($text);
|
|
$md_html_hashes[$key] = $text;
|
|
$md_html_blocks[$key] = $text;
|
|
return $key; # String that will replace the tag.
|
|
}
|
|
function _HashHTMLBlocks_HashClean($text) {
|
|
global $md_html_hashes;
|
|
$key = md5($text);
|
|
$md_html_hashes[$key] = $text;
|
|
return $key; # String that will replace the clean tag.
|
|
}
|
|
|
|
|
|
function _HashBlock($text) {
|
|
#
|
|
# Called whenever a tag must be hashed. When a function insert a block-level
|
|
# tag in $text, it pass through this function and is automaticaly escaped,
|
|
# which remove the need to call _HashHTMLBlocks at every step.
|
|
#
|
|
# Swap back any tag hash found in $text so we do not have to _UnhashTags
|
|
# multiple times at the end. Must do this because of
|
|
$text = _UnhashTags($text);
|
|
|
|
# Then hash the block as normal.
|
|
return _HashHTMLBlocks_HashBlock($text);
|
|
}
|
|
|
|
|
|
function _RunBlockGamut($text, $hash_html_blocks = TRUE) {
|
|
#
|
|
# These are all the transformations that form block-level
|
|
# tags like paragraphs, headers, and list items.
|
|
#
|
|
if ($hash_html_blocks) {
|
|
# We need to escape raw HTML in Markdown source before doing anything
|
|
# else. This need to be done for each block, and not only at the
|
|
# begining in the Markdown function since hashed blocks can be part of
|
|
# a list item and could have been indented. Indented blocks would have
|
|
# been seen as a code block in previous pass of _HashHTMLBlocks.
|
|
$text = _HashHTMLBlocks($text);
|
|
}
|
|
|
|
$text = _DoHeaders($text);
|
|
$text = _DoTables($text);
|
|
|
|
# Do Horizontal Rules:
|
|
global $md_empty_element_suffix;
|
|
$text = preg_replace(
|
|
array('{^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$}emx',
|
|
'{^[ ]{0,2}([ ]? -[ ]?){3,}[ \t]*$}emx',
|
|
'{^[ ]{0,2}([ ]? _[ ]?){3,}[ \t]*$}emx'),
|
|
"_HashBlock('\n<hr$md_empty_element_suffix\n')",
|
|
$text);
|
|
|
|
$text = _DoLists($text);
|
|
$text = _DoDefLists($text);
|
|
$text = _DoCodeBlocks($text);
|
|
$text = _DoBlockQuotes($text);
|
|
$text = _FormParagraphs($text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
function _RunSpanGamut($text) {
|
|
#
|
|
# These are all the transformations that occur *within* block-level
|
|
# tags like paragraphs, headers, and list items.
|
|
#
|
|
global $md_empty_element_suffix;
|
|
|
|
$text = _DoCodeSpans($text);
|
|
|
|
$text = _EscapeSpecialChars($text);
|
|
|
|
# Process anchor and image tags. Images must come first,
|
|
# because ![foo][f] looks like an anchor.
|
|
$text = _DoImages($text);
|
|
$text = _DoAnchors($text);
|
|
|
|
# Make links out of things like `<http://example.com/>`
|
|
# Must come after _DoAnchors(), because you can use < and >
|
|
# delimiters in inline links like [this](<url>).
|
|
$text = _DoAutoLinks($text);
|
|
$text = _EncodeAmpsAndAngles($text);
|
|
$text = _DoItalicsAndBold($text);
|
|
|
|
# Do hard breaks:
|
|
$text = preg_replace('/ {2,}\n/', "<br$md_empty_element_suffix\n", $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
function _EscapeSpecialChars($text) {
|
|
global $md_escape_table;
|
|
$tokens = _TokenizeHTML($text);
|
|
|
|
$text = ''; # rebuild $text from the tokens
|
|
# $in_pre = 0; # Keep track of when we're inside <pre> or <code> tags.
|
|
# $tags_to_skip = "!<(/?)(?:pre|code|kbd|script|math)[\s>]!";
|
|
|
|
foreach ($tokens as $cur_token) {
|
|
if ($cur_token[0] == 'tag') {
|
|
# Within tags, encode * and _ so they don't conflict
|
|
# with their use in Markdown for italics and strong.
|
|
# We're replacing each such character with its
|
|
# corresponding MD5 checksum value; this is likely
|
|
# overkill, but it should prevent us from colliding
|
|
# with the escape values by accident.
|
|
$cur_token[1] = str_replace(array('*', '_'),
|
|
array($md_escape_table['*'], $md_escape_table['_']),
|
|
$cur_token[1]);
|
|
$text .= $cur_token[1];
|
|
} else {
|
|
$t = $cur_token[1];
|
|
$t = _EncodeBackslashEscapes($t);
|
|
$text .= $t;
|
|
}
|
|
}
|
|
return $text;
|
|
}
|
|
|
|
|
|
function _DoAnchors($text) {
|
|
#
|
|
# Turn Markdown link shortcuts into XHTML <a> tags.
|
|
#
|
|
global $md_nested_brackets;
|
|
#
|
|
# First, handle reference-style links: [link text] [id]
|
|
#
|
|
$text = preg_replace_callback("{
|
|
( # wrap whole match in $1
|
|
\\[
|
|
($md_nested_brackets) # link text = $2
|
|
\\]
|
|
|
|
[ ]? # one optional space
|
|
(?:\\n[ ]*)? # one optional newline followed by spaces
|
|
|
|
\\[
|
|
(.*?) # id = $3
|
|
\\]
|
|
)
|
|
}xs",
|
|
'_DoAnchors_reference_callback', $text);
|
|
|
|
#
|
|
# Next, inline-style links: [link text](url "optional title")
|
|
#
|
|
$text = preg_replace_callback("{
|
|
( # wrap whole match in $1
|
|
\\[
|
|
($md_nested_brackets) # link text = $2
|
|
\\]
|
|
\\( # literal paren
|
|
[ \\t]*
|
|
<?(.*?)>? # href = $3
|
|
[ \\t]*
|
|
( # $4
|
|
(['\"]) # quote char = $5
|
|
(.*?) # Title = $6
|
|
\\5 # matching quote
|
|
)? # title is optional
|
|
\\)
|
|
)
|
|
}xs",
|
|
'_DoAnchors_inline_callback', $text);
|
|
|
|
return $text;
|
|
}
|
|
function _DoAnchors_reference_callback($matches) {
|
|
global $md_urls, $md_titles, $md_escape_table;
|
|
$whole_match = $matches[1];
|
|
$link_text = $matches[2];
|
|
$link_id = strtolower($matches[3]);
|
|
|
|
if ($link_id == "") {
|
|
$link_id = strtolower($link_text); # for shortcut links like [this][].
|
|
}
|
|
|
|
if (isset($md_urls[$link_id])) {
|
|
$url = $md_urls[$link_id];
|
|
# We've got to encode these to avoid conflicting with italics/bold.
|
|
$url = str_replace(array('*', '_'),
|
|
array($md_escape_table['*'], $md_escape_table['_']),
|
|
$url);
|
|
$result = "<a href=\"$url\"";
|
|
if ( isset( $md_titles[$link_id] ) ) {
|
|
$title = $md_titles[$link_id];
|
|
$title = str_replace(array('*', '_'),
|
|
array($md_escape_table['*'],
|
|
$md_escape_table['_']), $title);
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
$result .= ">$link_text</a>";
|
|
}
|
|
else {
|
|
$result = $whole_match;
|
|
}
|
|
return $result;
|
|
}
|
|
function _DoAnchors_inline_callback($matches) {
|
|
global $md_escape_table;
|
|
$whole_match = $matches[1];
|
|
$link_text = $matches[2];
|
|
$url = $matches[3];
|
|
$title =& $matches[6];
|
|
|
|
# We've got to encode these to avoid conflicting with italics/bold.
|
|
$url = str_replace(array('*', '_'),
|
|
array($md_escape_table['*'], $md_escape_table['_']),
|
|
$url);
|
|
$result = "<a href=\"$url\"";
|
|
if (isset($title)) {
|
|
$title = str_replace('"', '"', $title);
|
|
$title = str_replace(array('*', '_'),
|
|
array($md_escape_table['*'], $md_escape_table['_']),
|
|
$title);
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
|
|
$result .= ">$link_text</a>";
|
|
|
|
return $result;
|
|
}
|
|
|
|
|
|
function _DoImages($text) {
|
|
#
|
|
# Turn Markdown image shortcuts into <img> tags.
|
|
#
|
|
global $md_nested_brackets;
|
|
|
|
#
|
|
# First, handle reference-style labeled images: ![alt text][id]
|
|
#
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
!\[
|
|
('.$md_nested_brackets.') # alt text = $2
|
|
\]
|
|
|
|
[ ]? # one optional space
|
|
(?:\n[ ]*)? # one optional newline followed by spaces
|
|
|
|
\[
|
|
(.*?) # id = $3
|
|
\]
|
|
|
|
)
|
|
}xs',
|
|
'_DoImages_reference_callback', $text);
|
|
|
|
#
|
|
# Next, handle inline images: 
|
|
# Don't forget: encode * and _
|
|
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
!\[
|
|
('.$md_nested_brackets.') # alt text = $2
|
|
\]
|
|
\( # literal paren
|
|
[ \t]*
|
|
<?(\S+?)>? # src url = $3
|
|
[ \t]*
|
|
( # $4
|
|
([\'"]) # quote char = $5
|
|
(.*?) # title = $6
|
|
\5 # matching quote
|
|
[ \t]*
|
|
)? # title is optional
|
|
\)
|
|
)
|
|
}xs',
|
|
'_DoImages_inline_callback', $text);
|
|
|
|
return $text;
|
|
}
|
|
function _DoImages_reference_callback($matches) {
|
|
global $md_urls, $md_titles, $md_empty_element_suffix, $md_escape_table;
|
|
$whole_match = $matches[1];
|
|
$alt_text = $matches[2];
|
|
$link_id = strtolower($matches[3]);
|
|
|
|
if ($link_id == "") {
|
|
$link_id = strtolower($alt_text); # for shortcut links like ![this][].
|
|
}
|
|
|
|
$alt_text = str_replace('"', '"', $alt_text);
|
|
if (isset($md_urls[$link_id])) {
|
|
$url = $md_urls[$link_id];
|
|
# We've got to encode these to avoid conflicting with italics/bold.
|
|
$url = str_replace(array('*', '_'),
|
|
array($md_escape_table['*'], $md_escape_table['_']),
|
|
$url);
|
|
$result = "<img src=\"$url\" alt=\"$alt_text\"";
|
|
if (isset($md_titles[$link_id])) {
|
|
$title = $md_titles[$link_id];
|
|
$title = str_replace(array('*', '_'),
|
|
array($md_escape_table['*'],
|
|
$md_escape_table['_']), $title);
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
$result .= $md_empty_element_suffix;
|
|
}
|
|
else {
|
|
# If there's no such link ID, leave intact:
|
|
$result = $whole_match;
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
function _DoImages_inline_callback($matches) {
|
|
global $md_empty_element_suffix, $md_escape_table;
|
|
$whole_match = $matches[1];
|
|
$alt_text = $matches[2];
|
|
$url = $matches[3];
|
|
$title = '';
|
|
if (isset($matches[6])) {
|
|
$title = $matches[6];
|
|
}
|
|
|
|
$alt_text = str_replace('"', '"', $alt_text);
|
|
$title = str_replace('"', '"', $title);
|
|
# We've got to encode these to avoid conflicting with italics/bold.
|
|
$url = str_replace(array('*', '_'),
|
|
array($md_escape_table['*'], $md_escape_table['_']),
|
|
$url);
|
|
$result = "<img src=\"$url\" alt=\"$alt_text\"";
|
|
if (isset($title)) {
|
|
$title = str_replace(array('*', '_'),
|
|
array($md_escape_table['*'], $md_escape_table['_']),
|
|
$title);
|
|
$result .= " title=\"$title\""; # $title already quoted
|
|
}
|
|
$result .= $md_empty_element_suffix;
|
|
|
|
return $result;
|
|
}
|
|
|
|
|
|
function _DoHeaders($text) {
|
|
# Setext-style headers:
|
|
# Header 1
|
|
# ========
|
|
#
|
|
# Header 2
|
|
# --------
|
|
#
|
|
$text = preg_replace(
|
|
array('{ (^.+?) (?:[ ]+\{\#([-_:a-zA-Z0-9]+)\})? [ \t]*\n=+[ \t]*\n+ }emx',
|
|
'{ (^.+?) (?:[ ]+\{\#([-_:a-zA-Z0-9]+)\})? [ \t]*\n-+[ \t]*\n+ }emx'),
|
|
array("_HashBlock('<h1'. ('\\2'? ' id=\"'._UnslashQuotes('\\2').'\"':'').
|
|
'>'._RunSpanGamut(_UnslashQuotes('\\1')).'</h1>'
|
|
) . '\n\n'",
|
|
"_HashBlock('<h2'. ('\\2'? ' id=\"'._UnslashQuotes('\\2').'\"':'').
|
|
'>'._RunSpanGamut(_UnslashQuotes('\\1')).'</h2>'
|
|
) . '\n\n'"),
|
|
$text);
|
|
|
|
# atx-style headers:
|
|
# # Header 1
|
|
# ## Header 2
|
|
# ## Header 2 with closing hashes ##
|
|
# ...
|
|
# ###### Header 6
|
|
#
|
|
$text = preg_replace('{
|
|
^(\#{1,6}) # $1 = string of #\'s
|
|
[ \t]*
|
|
(.+?) # $2 = Header text
|
|
[ \t]*
|
|
\#* # optional closing #\'s (not counted)
|
|
(?:[ ]+\{\#([-_:a-zA-Z0-9]+)\}[ ]*)? # id attribute
|
|
\n+
|
|
}xme',
|
|
"_HashBlock(
|
|
'<h'.strlen('\\1'). ('\\3'? ' id=\"'._UnslashQuotes('\\3').'\"':'').'>'.
|
|
_RunSpanGamut(_UnslashQuotes('\\2')).
|
|
'</h'.strlen('\\1').'>'
|
|
) . '\n\n'",
|
|
$text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
function _DoTables($text) {
|
|
#
|
|
# Form HTML tables.
|
|
#
|
|
global $md_tab_width;
|
|
$less_than_tab = $md_tab_width - 1;
|
|
#
|
|
# Find tables with leading pipe.
|
|
#
|
|
# | Header 1 | Header 2
|
|
# | -------- | --------
|
|
# | Cell 1 | Cell 2
|
|
# | Cell 3 | Cell 4
|
|
#
|
|
$text = preg_replace_callback('
|
|
{
|
|
^ # Start of a line
|
|
[ ]{0,'.$less_than_tab.'} # Allowed whitespace.
|
|
[|] # Optional leading pipe (present)
|
|
(.+) \n # $1: Header row (at least one pipe)
|
|
|
|
[ ]{0,'.$less_than_tab.'} # Allowed whitespace.
|
|
[|] ([ ]*[-:]+[-| :]*) \n # $2: Header underline
|
|
|
|
( # $3: Cells
|
|
(?:
|
|
[ ]* # Allowed whitespace.
|
|
[|] .* \n # Row content.
|
|
)*
|
|
)
|
|
(?=\n|\Z) # Stop at final double newline.
|
|
}xm',
|
|
'_DoTable_LeadingPipe_callback', $text);
|
|
|
|
#
|
|
# Find tables without leading pipe.
|
|
#
|
|
# Header 1 | Header 2
|
|
# -------- | --------
|
|
# Cell 1 | Cell 2
|
|
# Cell 3 | Cell 4
|
|
#
|
|
$text = preg_replace_callback('
|
|
{
|
|
^ # Start of a line
|
|
[ ]{0,'.$less_than_tab.'} # Allowed whitespace.
|
|
(\S.*[|].*) \n # $1: Header row (at least one pipe)
|
|
|
|
[ ]{0,'.$less_than_tab.'} # Allowed whitespace.
|
|
([-:]+[ ]*[|][-| :]*) \n # $2: Header underline
|
|
|
|
( # $3: Cells
|
|
(?:
|
|
.* [|] .* \n # Row content
|
|
)*
|
|
)
|
|
(?=\n|\Z) # Stop at final double newline.
|
|
}xm',
|
|
'_DoTable_callback', $text);
|
|
|
|
return $text;
|
|
}
|
|
function _DoTable_LeadingPipe_callback($matches) {
|
|
$head = $matches[1];
|
|
$underline = $matches[2];
|
|
$content = $matches[3];
|
|
|
|
# Remove leading pipe for each row.
|
|
$content = preg_replace('/^ *[|]/m', '', $content);
|
|
|
|
return _DoTable_callback(array($matches[0], $head, $underline, $content));
|
|
}
|
|
function _DoTable_callback($matches) {
|
|
$head = $matches[1];
|
|
$underline = $matches[2];
|
|
$content = $matches[3];
|
|
|
|
# Remove any tailing pipes for each line.
|
|
$head = preg_replace('/[|] *$/m', '', $head);
|
|
$underline = preg_replace('/[|] *$/m', '', $underline);
|
|
$content = preg_replace('/[|] *$/m', '', $content);
|
|
|
|
# Reading alignement from header underline.
|
|
$separators = preg_split('/ *[|] */', $underline);
|
|
foreach ($separators as $n => $s) {
|
|
if (preg_match('/^ *-+: *$/', $s)) $attr[$n] = ' align="right"';
|
|
else if (preg_match('/^ *:-+: *$/', $s))$attr[$n] = ' align="center"';
|
|
else if (preg_match('/^ *:-+ *$/', $s)) $attr[$n] = ' align="left"';
|
|
else $attr[$n] = '';
|
|
}
|
|
|
|
# Creating code spans before splitting the row is an easy way to
|
|
# handle a code span containg pipes.
|
|
$head = _DoCodeSpans($head);
|
|
$headers = preg_split('/ *[|] */', $head);
|
|
$col_count = count($headers);
|
|
|
|
# Write column headers.
|
|
$text = "<table>\n";
|
|
$text .= "<thead>\n";
|
|
$text .= "<tr>\n";
|
|
foreach ($headers as $n => $header)
|
|
$text .= " <th$attr[$n]>"._RunSpanGamut(trim($header))."</th>\n";
|
|
$text .= "</tr>\n";
|
|
$text .= "</thead>\n";
|
|
|
|
# Split content by row.
|
|
$rows = explode("\n", trim($content, "\n"));
|
|
|
|
$text .= "<tbody>\n";
|
|
foreach ($rows as $row) {
|
|
# Creating code spans before splitting the row is an easy way to
|
|
# handle a code span containg pipes.
|
|
$row = _DoCodeSpans($row);
|
|
|
|
# Split row by cell.
|
|
$row_cells = preg_split('/ *[|] */', $row, $col_count);
|
|
$row_cells = array_pad($row_cells, $col_count, '');
|
|
|
|
$text .= "<tr>\n";
|
|
foreach ($row_cells as $n => $cell)
|
|
$text .= " <td$attr[$n]>"._RunSpanGamut(trim($cell))."</td>\n";
|
|
$text .= "</tr>\n";
|
|
}
|
|
$text .= "</tbody>\n";
|
|
$text .= "</table>";
|
|
|
|
return _HashBlock($text) . "\n";
|
|
}
|
|
|
|
|
|
function _DoLists($text) {
|
|
#
|
|
# Form HTML ordered (numbered) and unordered (bulleted) lists.
|
|
#
|
|
global $md_tab_width, $md_list_level;
|
|
$less_than_tab = $md_tab_width - 1;
|
|
|
|
# Re-usable patterns to match list item bullets and number markers:
|
|
$marker_ul = '[*+-]';
|
|
$marker_ol = '\d+[.]';
|
|
$marker_any = "(?:$marker_ul|$marker_ol)";
|
|
|
|
$markers = array($marker_ul, $marker_ol);
|
|
|
|
foreach ($markers as $marker) {
|
|
# Re-usable pattern to match any entirel ul or ol list:
|
|
$whole_list = '
|
|
( # $1 = whole list
|
|
( # $2
|
|
[ ]{0,'.$less_than_tab.'}
|
|
('.$marker.') # $3 = first list item marker
|
|
[ \t]+
|
|
)
|
|
(?s:.+?)
|
|
( # $4
|
|
\z
|
|
|
|
|
\n{2,}
|
|
(?=\S)
|
|
(?! # Negative lookahead for another list item marker
|
|
[ \t]*
|
|
'.$marker.'[ \t]+
|
|
)
|
|
)
|
|
)
|
|
'; // mx
|
|
|
|
# We use a different prefix before nested lists than top-level lists.
|
|
# See extended comment in _ProcessListItems().
|
|
|
|
if ($md_list_level) {
|
|
$text = preg_replace_callback('{
|
|
^
|
|
'.$whole_list.'
|
|
}mx',
|
|
'_DoLists_callback', $text);
|
|
}
|
|
else {
|
|
$text = preg_replace_callback('{
|
|
(?:(?<=\n\n)|\A\n?)
|
|
'.$whole_list.'
|
|
}mx',
|
|
'_DoLists_callback', $text);
|
|
}
|
|
}
|
|
|
|
return $text;
|
|
}
|
|
function _DoLists_callback($matches) {
|
|
# Re-usable patterns to match list item bullets and number markers:
|
|
$marker_ul = '[*+-]';
|
|
$marker_ol = '\d+[.]';
|
|
$marker_any = "(?:$marker_ul|$marker_ol)";
|
|
|
|
$list = $matches[1];
|
|
$list_type = preg_match("/$marker_ul/", $matches[3]) ? "ul" : "ol";
|
|
|
|
$marker_any = ( $list_type == "ul" ? $marker_ul : $marker_ol );
|
|
|
|
# Turn double returns into triple returns, so that we can make a
|
|
# paragraph for the last item in a list, if necessary:
|
|
$list = preg_replace("/\n{2,}/", "\n\n\n", $list);
|
|
$result = _ProcessListItems($list, $marker_any);
|
|
$result = "<$list_type>\n" . $result . "</$list_type>";
|
|
return "\n" . _HashBlock($result) . "\n\n";
|
|
}
|
|
|
|
|
|
function _ProcessListItems($list_str, $marker_any) {
|
|
#
|
|
# Process the contents of a single ordered or unordered list, splitting it
|
|
# into individual list items.
|
|
#
|
|
global $md_list_level;
|
|
|
|
# The $md_list_level global keeps track of when we're inside a list.
|
|
# Each time we enter a list, we increment it; when we leave a list,
|
|
# we decrement. If it's zero, we're not in a list anymore.
|
|
#
|
|
# We do this because when we're not inside a list, we want to treat
|
|
# something like this:
|
|
#
|
|
# I recommend upgrading to version
|
|
# 8. Oops, now this line is treated
|
|
# as a sub-list.
|
|
#
|
|
# As a single paragraph, despite the fact that the second line starts
|
|
# with a digit-period-space sequence.
|
|
#
|
|
# Whereas when we're inside a list (or sub-list), that line will be
|
|
# treated as the start of a sub-list. What a kludge, huh? This is
|
|
# an aspect of Markdown's syntax that's hard to parse perfectly
|
|
# without resorting to mind-reading. Perhaps the solution is to
|
|
# change the syntax rules such that sub-lists must start with a
|
|
# starting cardinal number; e.g. "1." or "a.".
|
|
|
|
$md_list_level++;
|
|
|
|
# trim trailing blank lines:
|
|
$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);
|
|
|
|
$list_str = preg_replace_callback('{
|
|
(\n)? # leading line = $1
|
|
(^[ \t]*) # leading whitespace = $2
|
|
('.$marker_any.') [ \t]+ # list marker = $3
|
|
((?s:.+?) # list item text = $4
|
|
(\n{1,2}))
|
|
(?= \n* (\z | \2 ('.$marker_any.') [ \t]+))
|
|
}xm',
|
|
'_ProcessListItems_callback', $list_str);
|
|
|
|
$md_list_level--;
|
|
return $list_str;
|
|
}
|
|
function _ProcessListItems_callback($matches) {
|
|
$item = $matches[4];
|
|
$leading_line =& $matches[1];
|
|
$leading_space =& $matches[2];
|
|
|
|
if ($leading_line || preg_match('/\n{2,}/', $item)) {
|
|
$item = _RunBlockGamut(_Outdent($item));
|
|
}
|
|
else {
|
|
# Recursion for sub-lists:
|
|
$item = _DoLists(_Outdent($item));
|
|
$item = preg_replace('/\n+$/', '', $item);
|
|
$item = _RunSpanGamut($item);
|
|
}
|
|
|
|
return "<li>" . $item . "</li>\n";
|
|
}
|
|
|
|
|
|
function _DoDefLists($text) {
|
|
#
|
|
# Form HTML definition lists.
|
|
#
|
|
global $md_tab_width;
|
|
$less_than_tab = $md_tab_width - 1;
|
|
|
|
# Re-usable patterns to match list item bullets and number markers:
|
|
|
|
# Re-usable pattern to match any entire dl list:
|
|
$whole_list = '
|
|
( # $1 = whole list
|
|
( # $2
|
|
[ ]{0,'.$less_than_tab.'}
|
|
((?>.*\S.*\n)+) # $3 = defined term
|
|
\n?
|
|
[ ]{0,'.$less_than_tab.'}:[ ]+ # colon starting definition
|
|
)
|
|
(?s:.+?)
|
|
( # $4
|
|
\z
|
|
|
|
|
\n{2,}
|
|
(?=\S)
|
|
(?! # Negative lookahead for another term
|
|
[ ]{0,'.$less_than_tab.'}
|
|
(?: \S.*\n )+? # defined term
|
|
\n?
|
|
[ ]{0,'.$less_than_tab.'}:[ ]+ # colon starting definition
|
|
)
|
|
(?! # Negative lookahead for another definition
|
|
[ ]{0,'.$less_than_tab.'}:[ ]+ # colon starting definition
|
|
)
|
|
)
|
|
)
|
|
'; // mx
|
|
|
|
$text = preg_replace_callback('{
|
|
(?:(?<=\n\n)|\A\n?)
|
|
'.$whole_list.'
|
|
}mx',
|
|
'_DoDefLists_callback', $text);
|
|
|
|
return $text;
|
|
}
|
|
function _DoDefLists_callback($matches) {
|
|
# Re-usable patterns to match list item bullets and number markers:
|
|
$list = $matches[1];
|
|
|
|
# Turn double returns into triple returns, so that we can make a
|
|
# paragraph for the last item in a list, if necessary:
|
|
$result = trim(_ProcessDefListItems($list));
|
|
$result = "<dl>\n" . $result . "\n</dl>";
|
|
return _HashBlock($result) . "\n\n";
|
|
}
|
|
|
|
|
|
function _ProcessDefListItems($list_str) {
|
|
#
|
|
# Process the contents of a single ordered or unordered list, splitting it
|
|
# into individual list items.
|
|
#
|
|
global $md_tab_width;
|
|
$less_than_tab = $md_tab_width - 1;
|
|
|
|
# trim trailing blank lines:
|
|
$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);
|
|
|
|
# Process definition terms.
|
|
$list_str = preg_replace_callback('{
|
|
(?:\n\n+|\A\n?) # leading line
|
|
( # definition terms = $1
|
|
[ ]{0,'.$less_than_tab.'} # leading whitespace
|
|
(?![:][ ]|[ ]) # negative lookahead for a definition
|
|
# mark (colon) or more whitespace.
|
|
(?: \S.* \n)+? # actual term (not whitespace).
|
|
)
|
|
(?=\n?[ ]{0,3}:[ ]) # lookahead for following line feed
|
|
# with a definition mark.
|
|
}xm',
|
|
'_ProcessDefListItems_callback_dt', $list_str);
|
|
|
|
# Process actual definitions.
|
|
$list_str = preg_replace_callback('{
|
|
\n(\n+)? # leading line = $1
|
|
[ ]{0,'.$less_than_tab.'} # whitespace before colon
|
|
[:][ ]+ # definition mark (colon)
|
|
((?s:.+?)) # definition text = $2
|
|
(?= \n+ # stop at next definition mark,
|
|
(?: # next term or end of text
|
|
[ ]{0,'.$less_than_tab.'} [:][ ] |
|
|
<dt> | \z
|
|
)
|
|
)
|
|
}xm',
|
|
'_ProcessDefListItems_callback_dd', $list_str);
|
|
|
|
return $list_str;
|
|
}
|
|
function _ProcessDefListItems_callback_dt($matches) {
|
|
$terms = explode("\n", trim($matches[1]));
|
|
$text = '';
|
|
foreach ($terms as $term) {
|
|
$term = _RunSpanGamut(trim($term));
|
|
$text .= "\n<dt>" . $term . "</dt>";
|
|
}
|
|
return $text . "\n";
|
|
}
|
|
function _ProcessDefListItems_callback_dd($matches) {
|
|
$leading_line = $matches[1];
|
|
$def = $matches[2];
|
|
|
|
if ($leading_line || preg_match('/\n{2,}/', $def)) {
|
|
$def = _RunBlockGamut(_Outdent($def . "\n\n"));
|
|
$def = "\n". $def ."\n";
|
|
}
|
|
else {
|
|
$def = rtrim($def);
|
|
$def = _RunSpanGamut(_Outdent($def));
|
|
}
|
|
|
|
return "\n<dd>" . $def . "</dd>\n";
|
|
}
|
|
|
|
|
|
function _DoCodeBlocks($text) {
|
|
#
|
|
# Process Markdown `<pre><code>` blocks.
|
|
#
|
|
global $md_tab_width;
|
|
$text = preg_replace_callback("{
|
|
(?:\\n\\n|\\A)
|
|
( # $1 = the code block -- one or more lines, starting with a space/tab
|
|
(?:
|
|
(?:[ ]\{$md_tab_width} | \\t) # Lines must start with a tab or a tab-width of spaces
|
|
.*\\n+
|
|
)+
|
|
)
|
|
((?=^[ ]{0,$md_tab_width}\\S)|\\Z) # Lookahead for non-space at line-start, or end of doc
|
|
}xm",
|
|
'_DoCodeBlocks_callback', $text);
|
|
|
|
return $text;
|
|
}
|
|
function _DoCodeBlocks_callback($matches) {
|
|
$codeblock = $matches[1];
|
|
|
|
$codeblock = _EncodeCode(_Outdent($codeblock));
|
|
// $codeblock = _Detab($codeblock);
|
|
# trim leading newlines and trailing whitespace
|
|
$codeblock = preg_replace(array('/\A\n+/', '/\s+\z/'), '', $codeblock);
|
|
|
|
$result = "<pre><code>" . $codeblock . "\n</code></pre>";
|
|
|
|
return "\n\n" . _HashBlock($result) . "\n\n";
|
|
}
|
|
|
|
|
|
function _DoCodeSpans($text) {
|
|
#
|
|
# * Backtick quotes are used for <code></code> spans.
|
|
#
|
|
# * You can use multiple backticks as the delimiters if you want to
|
|
# include literal backticks in the code span. So, this input:
|
|
#
|
|
# Just type ``foo `bar` baz`` at the prompt.
|
|
#
|
|
# Will translate to:
|
|
#
|
|
# <p>Just type <code>foo `bar` baz</code> at the prompt.</p>
|
|
#
|
|
# There's no arbitrary limit to the number of backticks you
|
|
# can use as delimters. If you need three consecutive backticks
|
|
# in your code, use four for delimiters, etc.
|
|
#
|
|
# * You can use spaces to get literal backticks at the edges:
|
|
#
|
|
# ... type `` `bar` `` ...
|
|
#
|
|
# Turns to:
|
|
#
|
|
# ... type <code>`bar`</code> ...
|
|
#
|
|
$text = preg_replace_callback('@
|
|
(?<!\\\) # Character before opening ` can\'t be a backslash
|
|
(`+) # $1 = Opening run of `
|
|
(.+?) # $2 = The code block
|
|
(?<!`)
|
|
\1 # Matching closer
|
|
(?!`)
|
|
@xs',
|
|
'_DoCodeSpans_callback', $text);
|
|
|
|
return $text;
|
|
}
|
|
function _DoCodeSpans_callback($matches) {
|
|
$c = $matches[2];
|
|
$c = preg_replace('/^[ \t]*/', '', $c); # leading whitespace
|
|
$c = preg_replace('/[ \t]*$/', '', $c); # trailing whitespace
|
|
$c = _EncodeCode($c);
|
|
return "<code>$c</code>";
|
|
}
|
|
|
|
|
|
function _EncodeCode($_) {
|
|
#
|
|
# Encode/escape certain characters inside Markdown code runs.
|
|
# The point is that in code, these characters are literals,
|
|
# and lose their special Markdown meanings.
|
|
#
|
|
global $md_escape_table;
|
|
|
|
# Encode all ampersands; HTML entities are not
|
|
# entities within a Markdown code span.
|
|
$_ = str_replace('&', '&', $_);
|
|
|
|
# Do the angle bracket song and dance:
|
|
$_ = str_replace(array('<', '>'),
|
|
array('<', '>'), $_);
|
|
|
|
# Now, escape characters that are magic in Markdown:
|
|
$_ = str_replace(array_keys($md_escape_table),
|
|
array_values($md_escape_table), $_);
|
|
|
|
return $_;
|
|
}
|
|
|
|
|
|
function _DoItalicsAndBold($text) {
|
|
# <strong> must go first:
|
|
$text = preg_replace(array(
|
|
'{
|
|
( (?<!\w) __ ) # $1: Marker (not preceded by alphanum)
|
|
(?=\S) # Not followed by whitespace
|
|
(?!__) # or two others marker chars.
|
|
( # $2: Content
|
|
(?>
|
|
[^_]+? # Anthing not em markers.
|
|
|
|
|
# Balence any regular _ emphasis inside.
|
|
(?<![a-zA-Z0-9])_ (?=\S) (?! _) (.+?)
|
|
(?<=\S) _ (?![a-zA-Z0-9])
|
|
)+?
|
|
)
|
|
(?<=\S) __ # End mark not preceded by whitespace.
|
|
(?!\w) # Not followed by alphanum.
|
|
}sx',
|
|
'{
|
|
( (?<!\*\*) \*\* ) # $1: Marker (not preceded by two *)
|
|
(?=\S) # Not followed by whitespace
|
|
(?!\1) # or two others marker chars.
|
|
( # $2: Content
|
|
(?>
|
|
[^*]+? # Anthing not em markers.
|
|
|
|
|
# Balence any regular * emphasis inside.
|
|
\* (?=\S) (?! \*) (.+?) (?<=\S) \*
|
|
)+?
|
|
)
|
|
(?<=\S) \*\* # End mark not preceded by whitespace.
|
|
}sx',
|
|
),
|
|
'<strong>\2</strong>', $text);
|
|
# Then <em>:
|
|
$text = preg_replace(array(
|
|
'{ ( (?<!\w) _ ) (?=\S) (?! _) (.+?) (?<=\S) _ (?!\w) }sx',
|
|
'{ ( (?<!\*)\* ) (?=\S) (?! \*) (.+?) (?<=\S) \* }sx',
|
|
),
|
|
'<em>\2</em>', $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
function _DoBlockQuotes($text) {
|
|
$text = preg_replace_callback('/
|
|
( # Wrap whole match in $1
|
|
(
|
|
^[ \t]*>[ \t]? # ">" at the start of a line
|
|
.+\n # rest of the first line
|
|
(.+\n)* # subsequent consecutive lines
|
|
\n* # blanks
|
|
)+
|
|
)
|
|
/xm',
|
|
'_DoBlockQuotes_callback', $text);
|
|
|
|
return $text;
|
|
}
|
|
function _DoBlockQuotes_callback($matches) {
|
|
$bq = $matches[1];
|
|
# trim one level of quoting - trim whitespace-only lines
|
|
$bq = preg_replace(array('/^[ \t]*>[ \t]?/m', '/^[ \t]+$/m'), '', $bq);
|
|
$bq = _RunBlockGamut($bq); # recurse
|
|
|
|
$bq = preg_replace('/^/m', " ", $bq);
|
|
# These leading spaces screw with <pre> content, so we need to fix that:
|
|
$bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx',
|
|
'_DoBlockQuotes_callback2', $bq);
|
|
|
|
return _HashBlock("<blockquote>\n$bq\n</blockquote>") . "\n\n";
|
|
}
|
|
function _DoBlockQuotes_callback2($matches) {
|
|
$pre = $matches[1];
|
|
$pre = preg_replace('/^ /m', '', $pre);
|
|
return $pre;
|
|
}
|
|
|
|
|
|
function _FormParagraphs($text) {
|
|
#
|
|
# Params:
|
|
# $text - string to process with html <p> tags
|
|
#
|
|
global $md_html_blocks, $md_html_hashes;
|
|
|
|
# Strip leading and trailing lines:
|
|
$text = preg_replace(array('/\A\n+/', '/\n+\z/'), '', $text);
|
|
|
|
$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
|
|
|
|
#
|
|
# Wrap <p> tags and unhashify HTML blocks
|
|
#
|
|
foreach ($grafs as $key => $value) {
|
|
$value = trim(_RunSpanGamut($value));
|
|
|
|
# Check if this should be enclosed in a paragraph.
|
|
# Text equaling to a clean tag hash are not enclosed.
|
|
# Text starting with a block tag hash are not either.
|
|
$clean_key = $value;
|
|
$block_key = substr($value, 0, 32);
|
|
|
|
$is_p = (!isset($md_html_blocks[$block_key]) &&
|
|
!isset($md_html_hashes[$clean_key]));
|
|
|
|
if ($is_p) {
|
|
$value = "<p>$value</p>";
|
|
}
|
|
$grafs[$key] = $value;
|
|
}
|
|
|
|
# Join grafs in one text, then unhash HTML tags.
|
|
$text = implode("\n\n", $grafs);
|
|
|
|
# Finish by removing any tag hashes still present in $text.
|
|
$text = _UnhashTags($text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
function _EncodeAmpsAndAngles($text) {
|
|
# Smart processing for ampersands and angle brackets that need to be encoded.
|
|
|
|
# Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
|
|
# http://bumppo.net/projects/amputator/
|
|
$text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/',
|
|
'&', $text);;
|
|
|
|
# Encode naked <'s
|
|
$text = preg_replace('{<(?![a-z/?\$!])}i', '<', $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
function _EncodeBackslashEscapes($text) {
|
|
#
|
|
# Parameter: String.
|
|
# Returns: The string, with after processing the following backslash
|
|
# escape sequences.
|
|
#
|
|
global $md_escape_table, $md_backslash_escape_table;
|
|
# Must process escaped backslashes first.
|
|
return str_replace(array_keys($md_backslash_escape_table),
|
|
array_values($md_backslash_escape_table), $text);
|
|
}
|
|
|
|
|
|
function _DoAutoLinks($text) {
|
|
$text = preg_replace("!<((https?|ftp):[^'\">\\s]+)>!",
|
|
'<a href="\1">\1</a>', $text);
|
|
|
|
# Email addresses: <address@domain.foo>
|
|
$text = preg_replace('{
|
|
<
|
|
(?:mailto:)?
|
|
(
|
|
[-.\w]+
|
|
\@
|
|
[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
|
|
)
|
|
>
|
|
}exi',
|
|
"_EncodeEmailAddress(_UnescapeSpecialChars(_UnslashQuotes('\\1')))",
|
|
$text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
function _EncodeEmailAddress($addr) {
|
|
#
|
|
# Input: an email address, e.g. "foo@example.com"
|
|
#
|
|
# Output: the email address as a mailto link, with each character
|
|
# of the address encoded as either a decimal or hex entity, in
|
|
# the hopes of foiling most address harvesting spam bots. E.g.:
|
|
#
|
|
# <a href="mailto:foo@e
|
|
# xample.com">foo
|
|
# @example.com</a>
|
|
#
|
|
# Based by a filter by Matthew Wickline, posted to the BBEdit-Talk
|
|
# mailing list: <http://tinyurl.com/yu7ue>
|
|
#
|
|
$addr = "mailto:" . $addr;
|
|
$length = strlen($addr);
|
|
|
|
# leave ':' alone (to spot mailto: later)
|
|
$addr = preg_replace_callback('/([^\:])/',
|
|
'_EncodeEmailAddress_callback', $addr);
|
|
|
|
$addr = "<a href=\"$addr\">$addr</a>";
|
|
# strip the mailto: from the visible part
|
|
$addr = preg_replace('/">.+?:/', '">', $addr);
|
|
|
|
return $addr;
|
|
}
|
|
function _EncodeEmailAddress_callback($matches) {
|
|
$char = $matches[1];
|
|
$r = rand(0, 100);
|
|
# roughly 10% raw, 45% hex, 45% dec
|
|
# '@' *must* be encoded. I insist.
|
|
if ($r > 90 && $char != '@') return $char;
|
|
if ($r < 45) return '&#x'.dechex(ord($char)).';';
|
|
return '&#'.ord($char).';';
|
|
}
|
|
|
|
|
|
function _UnescapeSpecialChars($text) {
|
|
#
|
|
# Swap back in all the special characters we've hidden.
|
|
#
|
|
global $md_escape_table;
|
|
return str_replace(array_values($md_escape_table),
|
|
array_keys($md_escape_table), $text);
|
|
}
|
|
|
|
|
|
function _UnhashTags($text) {
|
|
#
|
|
# Swap back in all the tags hashed by _HashHTMLBlocks.
|
|
#
|
|
global $md_html_hashes;
|
|
return str_replace(array_keys($md_html_hashes),
|
|
array_values($md_html_hashes), $text);
|
|
}
|
|
|
|
|
|
# _TokenizeHTML is shared between PHP Markdown and PHP SmartyPants.
|
|
# We only define it if it is not already defined.
|
|
if (!function_exists('_TokenizeHTML')) :
|
|
function _TokenizeHTML($str) {
|
|
#
|
|
# Parameter: String containing HTML markup.
|
|
# Returns: An array of the tokens comprising the input
|
|
# string. Each token is either a tag (possibly with nested,
|
|
# tags contained therein, such as <a href="<MTFoo>">, or a
|
|
# run of text between tags. Each element of the array is a
|
|
# two-element array; the first is either 'tag' or 'text';
|
|
# the second is the actual value.
|
|
#
|
|
#
|
|
# Regular expression derived from the _tokenize() subroutine in
|
|
# Brad Choate's MTRegex plugin.
|
|
# <http://www.bradchoate.com/past/mtregex.php>
|
|
#
|
|
$index = 0;
|
|
$tokens = array();
|
|
|
|
$match = '(?s:<!(?:--.*?--\s*)+>)|'. # comment
|
|
'(?s:<\?.*?\?>)|'. # processing instruction
|
|
# regular tags
|
|
'(?:<[/!$]?[-a-zA-Z0-9:]+\b(?>[^"\'>]+|"[^"]*"|\'[^\']*\')*>)';
|
|
|
|
$parts = preg_split("{($match)}", $str, -1, PREG_SPLIT_DELIM_CAPTURE);
|
|
|
|
foreach ($parts as $part) {
|
|
if (++$index % 2 && $part != '')
|
|
$tokens[] = array('text', $part);
|
|
else
|
|
$tokens[] = array('tag', $part);
|
|
}
|
|
|
|
return $tokens;
|
|
}
|
|
endif;
|
|
|
|
|
|
function _Outdent($text) {
|
|
#
|
|
# Remove one level of line-leading tabs or spaces
|
|
#
|
|
global $md_tab_width;
|
|
return preg_replace("/^(\\t|[ ]{1,$md_tab_width})/m", "", $text);
|
|
}
|
|
|
|
|
|
function _Detab($text) {
|
|
#
|
|
# Replace tabs with the appropriate amount of space.
|
|
#
|
|
global $md_tab_width;
|
|
|
|
# For each line we separate the line in blocks delemited by
|
|
# tab characters. Then we reconstruct every line by adding the
|
|
# appropriate number of space between each blocks.
|
|
|
|
$lines = explode("\n", $text);
|
|
$text = "";
|
|
|
|
foreach ($lines as $line) {
|
|
# Split in blocks.
|
|
$blocks = explode("\t", $line);
|
|
# Add each blocks to the line.
|
|
$line = $blocks[0];
|
|
unset($blocks[0]); # Do not add first block twice.
|
|
foreach ($blocks as $block) {
|
|
# Calculate amount of space, insert spaces, insert block.
|
|
$amount = $md_tab_width - strlen($line) % $md_tab_width;
|
|
$line .= str_repeat(" ", $amount) . $block;
|
|
}
|
|
$text .= "$line\n";
|
|
}
|
|
return $text;
|
|
}
|
|
|
|
|
|
function _UnslashQuotes($text) {
|
|
#
|
|
# This function is useful to remove automaticaly slashed double quotes
|
|
# when using preg_replace and evaluating an expression.
|
|
# Parameter: String.
|
|
# Returns: The string with any slash-double-quote (\") sequence replaced
|
|
# by a single double quote.
|
|
#
|
|
return str_replace('\"', '"', $text);
|
|
}
|
|
|
|
|
|
/*
|
|
|
|
PHP Markdown Extra
|
|
==================
|
|
|
|
Description
|
|
-----------
|
|
|
|
This is a PHP translation of the original Markdown formatter written in
|
|
Perl by John Gruber. This special version of PHP Markdown also include
|
|
syntax additions by myself.
|
|
|
|
Markdown is a text-to-HTML filter; it translates an easy-to-read /
|
|
easy-to-write structured text format into HTML. Markdown's text format
|
|
is most similar to that of plain text email, and supports features such
|
|
as headers, *emphasis*, code blocks, blockquotes, and links.
|
|
|
|
Markdown's syntax is designed not as a generic markup language, but
|
|
specifically to serve as a front-end to (X)HTML. You can use span-level
|
|
HTML tags anywhere in a Markdown document, and you can use block level
|
|
HTML tags (like <div> and <table> as well).
|
|
|
|
For more information about Markdown's syntax, see:
|
|
|
|
<http://daringfireball.net/projects/markdown/>
|
|
|
|
|
|
Bugs
|
|
----
|
|
|
|
To file bug reports please send email to:
|
|
|
|
<michel.fortin@michelf.com>
|
|
|
|
Please include with your report: (1) the example input; (2) the output you
|
|
expected; (3) the output Markdown actually produced.
|
|
|
|
|
|
Version History
|
|
---------------
|
|
|
|
See Readme file for details.
|
|
|
|
Extra 1.0 - 5 September 2005
|
|
|
|
Extra 1.0b4 - 1 August 2005
|
|
|
|
Extra 1.0b3 - 29 July 2005
|
|
|
|
Extra 1.0b2 - 26 July 2005
|
|
|
|
Extra 1.0b1 - 25 July 2005
|
|
|
|
|
|
Author & Contributors
|
|
---------------------
|
|
|
|
Original Markdown in Perl by John Gruber
|
|
<http://daringfireball.net/>
|
|
|
|
PHP port and extras by Michel Fortin
|
|
<http://www.michelf.com/>
|
|
|
|
|
|
Copyright and License
|
|
---------------------
|
|
|
|
Copyright (c) 2004-2005 Michel Fortin
|
|
<http://www.michelf.com/>
|
|
All rights reserved.
|
|
|
|
Based on Markdown
|
|
Copyright (c) 2003-2004 John Gruber
|
|
<http://daringfireball.net/>
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
* Neither the name "Markdown" nor the names of its contributors may
|
|
be used to endorse or promote products derived from this software
|
|
without specific prior written permission.
|
|
|
|
This software is provided by the copyright holders and contributors "as
|
|
is" and any express or implied warranties, including, but not limited
|
|
to, the implied warranties of merchantability and fitness for a
|
|
particular purpose are disclaimed. In no event shall the copyright owner
|
|
or contributors be liable for any direct, indirect, incidental, special,
|
|
exemplary, or consequential damages (including, but not limited to,
|
|
procurement of substitute goods or services; loss of use, data, or
|
|
profits; or business interruption) however caused and on any theory of
|
|
liability, whether in contract, strict liability, or tort (including
|
|
negligence or otherwise) arising in any way out of the use of this
|
|
software, even if advised of the possibility of such damage.
|
|
|
|
*/
|
|
?>
|