3870 lines
108 KiB
PHP
3870 lines
108 KiB
PHP
<?php
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// Markdown extension, https://github.com/datenstrom/yellow-extensions/tree/master/features/markdown
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// Copyright (c) 2013-2019 Datenstrom, https://datenstrom.se
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// This file may be used and distributed under the terms of the public license.
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class YellowMarkdown {
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const VERSION = "0.8.2";
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const TYPE = "feature";
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public $yellow; //access to API
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// Handle initialisation
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public function onLoad($yellow) {
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$this->yellow = $yellow;
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}
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// Handle page content in raw format
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public function onParseContentRaw($page, $text) {
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$markdown = new YellowMarkdownExtraParser($this->yellow, $page);
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return $markdown->transform($text);
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}
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}
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// PHP Markdown Lib
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// Copyright (c) 2004-2018 Michel Fortin
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// <https://michelf.ca/>
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// All rights reserved.
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//
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// Original Markdown
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// Copyright (c) 2004-2006 John Gruber
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// <https://daringfireball.net/>
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// * Neither the name "Markdown" nor the names of its contributors may
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// be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// This software is provided by the copyright holders and contributors "as
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// is" and any express or implied warranties, including, but not limited
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// to, the implied warranties of merchantability and fitness for a
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// particular purpose are disclaimed. In no event shall the copyright owner
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// or contributors be liable for any direct, indirect, incidental, special,
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// exemplary, or consequential damages (including, but not limited to,
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// procurement of substitute goods or services; loss of use, data, or
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// profits; or business interruption) however caused and on any theory of
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// liability, whether in contract, strict liability, or tort (including
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// negligence or otherwise) arising in any way out of the use of this
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// software, even if advised of the possibility of such damage.
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class MarkdownParser {
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/**
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* Define the package version
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* @var string
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*/
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const MARKDOWNLIB_VERSION = "1.8.0";
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/**
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* Simple function interface - Initialize the parser and return the result
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* of its transform method. This will work fine for derived classes too.
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*
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* @api
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*
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* @param string $text
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* @return string
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*/
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public static function defaultTransform($text) {
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// Take parser class on which this function was called.
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$parser_class = \get_called_class();
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// Try to take parser from the static parser list
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static $parser_list;
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$parser =& $parser_list[$parser_class];
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// Create the parser it not already set
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if (!$parser) {
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$parser = new $parser_class;
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}
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// Transform text using parser.
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return $parser->transform($text);
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}
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/**
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* Configuration variables
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*/
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/**
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* Change to ">" for HTML output.
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* @var string
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*/
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public $empty_element_suffix = " />";
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/**
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* The width of indentation of the output markup
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* @var int
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*/
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public $tab_width = 4;
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/**
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* Change to `true` to disallow markup or entities.
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* @var boolean
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*/
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public $no_markup = false;
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public $no_entities = false;
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/**
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* Change to `true` to enable line breaks on \n without two trailling spaces
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* @var boolean
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*/
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public $hard_wrap = false;
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/**
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* Predefined URLs and titles for reference links and images.
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* @var array
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*/
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public $predef_urls = array();
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public $predef_titles = array();
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/**
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* Optional filter function for URLs
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* @var callable
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*/
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public $url_filter_func = null;
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/**
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* Optional header id="" generation callback function.
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* @var callable
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*/
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public $header_id_func = null;
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/**
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* Optional function for converting code block content to HTML
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* @var callable
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*/
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public $code_block_content_func = null;
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/**
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* Optional function for converting code span content to HTML.
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* @var callable
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*/
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public $code_span_content_func = null;
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/**
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* Class attribute to toggle "enhanced ordered list" behaviour
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* setting this to true will allow ordered lists to start from the index
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* number that is defined first.
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*
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* For example:
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* 2. List item two
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* 3. List item three
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*
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* Becomes:
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* <ol start="2">
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* <li>List item two</li>
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* <li>List item three</li>
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* </ol>
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*
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* @var bool
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*/
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public $enhanced_ordered_list = false;
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/**
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* Parser implementation
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*/
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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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* @var int
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*/
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protected $nested_brackets_depth = 6;
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protected $nested_brackets_re;
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protected $nested_url_parenthesis_depth = 4;
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protected $nested_url_parenthesis_re;
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/**
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* Table of hash values for escaped characters:
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* @var string
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*/
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protected $escape_chars = '\`*_{}[]()>#+-.!';
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protected $escape_chars_re;
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/**
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* Constructor function. Initialize appropriate member variables.
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* @return void
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*/
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public function __construct() {
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$this->_initDetab();
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$this->prepareItalicsAndBold();
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$this->nested_brackets_re =
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str_repeat('(?>[^\[\]]+|\[', $this->nested_brackets_depth).
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str_repeat('\])*', $this->nested_brackets_depth);
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$this->nested_url_parenthesis_re =
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str_repeat('(?>[^()\s]+|\(', $this->nested_url_parenthesis_depth).
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str_repeat('(?>\)))*', $this->nested_url_parenthesis_depth);
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$this->escape_chars_re = '['.preg_quote($this->escape_chars).']';
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// Sort document, block, and span gamut in ascendent priority order.
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asort($this->document_gamut);
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asort($this->block_gamut);
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asort($this->span_gamut);
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}
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/**
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* Internal hashes used during transformation.
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* @var array
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*/
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protected $urls = array();
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protected $titles = array();
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protected $html_hashes = array();
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/**
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* Status flag to avoid invalid nesting.
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* @var boolean
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*/
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protected $in_anchor = false;
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/**
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* Status flag to avoid invalid nesting.
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* @var boolean
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*/
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protected $in_emphasis_processing = false;
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/**
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* Called before the transformation process starts to setup parser states.
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* @return void
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*/
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protected function setup() {
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// Clear global hashes.
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$this->urls = $this->predef_urls;
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$this->titles = $this->predef_titles;
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$this->html_hashes = array();
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$this->in_anchor = false;
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$this->in_emphasis_processing = false;
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}
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/**
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* Called after the transformation process to clear any variable which may
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* be taking up memory unnecessarly.
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* @return void
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*/
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protected function teardown() {
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$this->urls = array();
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$this->titles = array();
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$this->html_hashes = array();
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}
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/**
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* Main function. Performs some preprocessing on the input text and pass
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* it through the document gamut.
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*
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* @api
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*
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* @param string $text
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* @return string
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*/
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public function transform($text) {
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$this->setup();
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# Remove UTF-8 BOM and marker character in input, if present.
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$text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text);
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# Standardize line endings:
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# DOS to Unix and Mac to Unix
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$text = preg_replace('{\r\n?}', "\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 = $this->detab($text);
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# Turn block-level HTML blocks into hash entries
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$text = $this->hashHTMLBlocks($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 /[ ]*\n+/ .
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$text = preg_replace('/^[ ]+$/m', '', $text);
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# Run document gamut methods.
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foreach ($this->document_gamut as $method => $priority) {
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$text = $this->$method($text);
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}
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$this->teardown();
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return $text . "\n";
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}
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/**
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* Define the document gamut
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* @var array
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*/
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protected $document_gamut = array(
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// Strip link definitions, store in hashes.
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"stripLinkDefinitions" => 20,
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"runBasicBlockGamut" => 30,
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);
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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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* @param string $text
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* @return string
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*/
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protected function stripLinkDefinitions($text) {
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$less_than_tab = $this->tab_width - 1;
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// Link defs are in the form: ^[id]: url "optional title"
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$text = preg_replace_callback('{
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^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?: # id = $1
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[ ]*
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\n? # maybe *one* newline
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[ ]*
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(?:
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<(.+?)> # url = $2
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(\S+?) # url = $3
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)
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[ ]*
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\n? # maybe one newline
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[ ]*
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(?:
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(?<=\s) # lookbehind for whitespace
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["(]
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(.*?) # title = $4
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[")]
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[ ]*
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)? # title is optional
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(?:\n+|\Z)
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}xm',
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array($this, '_stripLinkDefinitions_callback'),
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$text
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);
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return $text;
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}
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/**
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* The callback to strip link definitions
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* @param array $matches
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* @return string
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*/
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protected function _stripLinkDefinitions_callback($matches) {
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$link_id = strtolower($matches[1]);
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$url = $matches[2] == '' ? $matches[3] : $matches[2];
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$this->urls[$link_id] = $url;
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$this->titles[$link_id] =& $matches[4];
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return ''; // String that will replace the block
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}
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/**
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* Hashify HTML blocks
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* @param string $text
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* @return string
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*/
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protected function hashHTMLBlocks($text) {
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if ($this->no_markup) {
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return $text;
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}
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$less_than_tab = $this->tab_width - 1;
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/**
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* Hashify HTML blocks:
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*
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* We only want to do this for block-level HTML tags, such as headers,
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* lists, and tables. That's because we still want to wrap <p>s around
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* "paragraphs" that are wrapped in non-block-level tags, such as
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* anchors, phrase emphasis, and spans. The list of tags we're looking
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* for is hard-coded:
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*
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* * List "a" is made of tags which can be both inline or block-level.
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* These will be treated block-level when the start tag is alone on
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* its line, otherwise they're not matched here and will be taken as
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* inline later.
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* * List "b" is made of tags which are always block-level;
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*/
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$block_tags_a_re = 'ins|del';
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$block_tags_b_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|'.
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'script|noscript|style|form|fieldset|iframe|math|svg|'.
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'article|section|nav|aside|hgroup|header|footer|'.
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'figure';
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// Regular expression for the content of a block tag.
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$nested_tags_level = 4;
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$attr = '
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(?> # optional tag attributes
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\s # starts with whitespace
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(?>
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[^>"/]+ # text outside quotes
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/+(?!>) # slash not followed by ">"
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"[^"]*" # text inside double quotes (tolerate ">")
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\'[^\']*\' # text inside single quotes (tolerate ">")
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)*
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)?
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';
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$content =
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str_repeat('
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(?>
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[^<]+ # content without tag
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<\2 # nested opening tag
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'.$attr.' # attributes
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(?>
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/>
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>', $nested_tags_level). // end of opening tag
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'.*?'. // last level nested tag content
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str_repeat('
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</\2\s*> # closing nested tag
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)
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<(?!/\2\s*> # other tags with a different name
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)
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)*',
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$nested_tags_level);
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$content2 = str_replace('\2', '\3', $content);
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/**
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* First, look for nested blocks, e.g.:
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* <div>
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* <div>
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* tags for inner block must be indented.
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* </div>
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* </div>
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*
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* The outermost tags must start at the left margin for this to match,
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* and the inner nested divs must be indented.
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* We need to do this before the next, more liberal match, because the
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* next match will start at the first `<div>` and stop at the
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* first `</div>`.
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*/
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$text = preg_replace_callback('{(?>
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(?>
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(?<=\n) # Starting on its own line
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| # or
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\A\n? # the at beginning of the doc
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)
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( # save in $1
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# Match from `\n<tag>` to `</tag>\n`, handling nested tags
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# in between.
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[ ]{0,'.$less_than_tab.'}
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<('.$block_tags_b_re.')# start tag = $2
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'.$attr.'> # attributes followed by > and \n
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'.$content.' # content, support nesting
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</\2> # the matching end tag
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[ ]* # trailing spaces/tabs
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(?=\n+|\Z) # followed by a newline or end of document
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|
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| # Special version for tags of group a.
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[ ]{0,'.$less_than_tab.'}
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<('.$block_tags_a_re.')# start tag = $3
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'.$attr.'>[ ]*\n # attributes followed by >
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'.$content2.' # content, support nesting
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</\3> # the matching end tag
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[ ]* # trailing spaces/tabs
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(?=\n+|\Z) # followed by a newline or end of document
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|
|
| # Special case just for <hr />. It was easier to make a special
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# case than to make the other regex more complicated.
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[ ]{0,'.$less_than_tab.'}
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<(hr) # start tag = $2
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'.$attr.' # attributes
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/?> # the matching end tag
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[ ]*
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(?=\n{2,}|\Z) # followed by a blank line or end of document
|
|
|
|
| # Special case for standalone HTML comments:
|
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[ ]{0,'.$less_than_tab.'}
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(?s:
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<!-- .*? -->
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)
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[ ]*
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(?=\n{2,}|\Z) # followed by a blank line or end of document
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|
|
|
| # PHP and ASP-style processor instructions (<? and <%)
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|
|
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[ ]{0,'.$less_than_tab.'}
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(?s:
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<([?%]) # $2
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|
.*?
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\2>
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)
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|
[ ]*
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(?=\n{2,}|\Z) # followed by a blank line or end of document
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|
|
|
)
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)}Sxmi',
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array($this, '_hashHTMLBlocks_callback'),
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$text
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);
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return $text;
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}
|
|
|
|
/**
|
|
* The callback for hashing HTML blocks
|
|
* @param string $matches
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* @return string
|
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*/
|
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protected function _hashHTMLBlocks_callback($matches) {
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$text = $matches[1];
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$key = $this->hashBlock($text);
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return "\n\n$key\n\n";
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}
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|
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/**
|
|
* Called whenever a tag must be hashed when a function insert an atomic
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* element in the text stream. Passing $text to through this function gives
|
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* a unique text-token which will be reverted back when calling unhash.
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*
|
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* The $boundary argument specify what character should be used to surround
|
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* the token. By convension, "B" is used for block elements that needs not
|
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* to be wrapped into paragraph tags at the end, ":" is used for elements
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* that are word separators and "X" is used in the general case.
|
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*
|
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* @param string $text
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* @param string $boundary
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* @return string
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*/
|
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protected function hashPart($text, $boundary = 'X') {
|
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// Swap back any tag hash found in $text so we do not have to `unhash`
|
|
// multiple times at the end.
|
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$text = $this->unhash($text);
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|
|
// Then hash the block.
|
|
static $i = 0;
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$key = "$boundary\x1A" . ++$i . $boundary;
|
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$this->html_hashes[$key] = $text;
|
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return $key; // String that will replace the tag.
|
|
}
|
|
|
|
/**
|
|
* Shortcut function for hashPart with block-level boundaries.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function hashBlock($text) {
|
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return $this->hashPart($text, 'B');
|
|
}
|
|
|
|
/**
|
|
* Define the block gamut - these are all the transformations that form
|
|
* block-level tags like paragraphs, headers, and list items.
|
|
* @var array
|
|
*/
|
|
protected $block_gamut = array(
|
|
"doHeaders" => 10,
|
|
"doHorizontalRules" => 20,
|
|
"doLists" => 40,
|
|
"doCodeBlocks" => 50,
|
|
"doBlockQuotes" => 60,
|
|
);
|
|
|
|
/**
|
|
* Run block gamut tranformations.
|
|
*
|
|
* 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
|
|
* list items and could have been indented. Indented blocks would have
|
|
* been seen as a code block in a previous pass of hashHTMLBlocks.
|
|
*
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function runBlockGamut($text) {
|
|
$text = $this->hashHTMLBlocks($text);
|
|
return $this->runBasicBlockGamut($text);
|
|
}
|
|
|
|
/**
|
|
* Run block gamut tranformations, without hashing HTML blocks. This is
|
|
* useful when HTML blocks are known to be already hashed, like in the first
|
|
* whole-document pass.
|
|
*
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function runBasicBlockGamut($text) {
|
|
|
|
foreach ($this->block_gamut as $method => $priority) {
|
|
$text = $this->$method($text);
|
|
}
|
|
|
|
// Finally form paragraph and restore hashed blocks.
|
|
$text = $this->formParagraphs($text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Convert horizontal rules
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doHorizontalRules($text) {
|
|
return preg_replace(
|
|
'{
|
|
^[ ]{0,3} # Leading space
|
|
([-*_]) # $1: First marker
|
|
(?> # Repeated marker group
|
|
[ ]{0,2} # Zero, one, or two spaces.
|
|
\1 # Marker character
|
|
){2,} # Group repeated at least twice
|
|
[ ]* # Tailing spaces
|
|
$ # End of line.
|
|
}mx',
|
|
"\n".$this->hashBlock("<hr$this->empty_element_suffix")."\n",
|
|
$text
|
|
);
|
|
}
|
|
|
|
/**
|
|
* These are all the transformations that occur *within* block-level
|
|
* tags like paragraphs, headers, and list items.
|
|
* @var array
|
|
*/
|
|
protected $span_gamut = array(
|
|
// Process character escapes, code spans, and inline HTML
|
|
// in one shot.
|
|
"parseSpan" => -30,
|
|
// Process anchor and image tags. Images must come first,
|
|
// because ![foo][f] looks like an anchor.
|
|
"doImages" => 10,
|
|
"doAnchors" => 20,
|
|
// Make links out of things like `<https://example.com/>`
|
|
// Must come after doAnchors, because you can use < and >
|
|
// delimiters in inline links like [this](<url>).
|
|
"doAutoLinks" => 30,
|
|
"encodeAmpsAndAngles" => 40,
|
|
"doItalicsAndBold" => 50,
|
|
"doHardBreaks" => 60,
|
|
);
|
|
|
|
/**
|
|
* Run span gamut transformations
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function runSpanGamut($text) {
|
|
foreach ($this->span_gamut as $method => $priority) {
|
|
$text = $this->$method($text);
|
|
}
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Do hard breaks
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doHardBreaks($text) {
|
|
if ($this->hard_wrap) {
|
|
return preg_replace_callback('/ *\n/',
|
|
array($this, '_doHardBreaks_callback'), $text);
|
|
} else {
|
|
return preg_replace_callback('/ {2,}\n/',
|
|
array($this, '_doHardBreaks_callback'), $text);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Trigger part hashing for the hard break (callback method)
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doHardBreaks_callback($matches) {
|
|
return $this->hashPart("<br$this->empty_element_suffix\n");
|
|
}
|
|
|
|
/**
|
|
* Turn Markdown link shortcuts into XHTML <a> tags.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doAnchors($text) {
|
|
if ($this->in_anchor) {
|
|
return $text;
|
|
}
|
|
$this->in_anchor = true;
|
|
|
|
// First, handle reference-style links: [link text] [id]
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
\[
|
|
('.$this->nested_brackets_re.') # link text = $2
|
|
\]
|
|
|
|
[ ]? # one optional space
|
|
(?:\n[ ]*)? # one optional newline followed by spaces
|
|
|
|
\[
|
|
(.*?) # id = $3
|
|
\]
|
|
)
|
|
}xs',
|
|
array($this, '_doAnchors_reference_callback'), $text);
|
|
|
|
// Next, inline-style links: [link text](url "optional title")
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
\[
|
|
('.$this->nested_brackets_re.') # link text = $2
|
|
\]
|
|
\( # literal paren
|
|
[ \n]*
|
|
(?:
|
|
<(.+?)> # href = $3
|
|
|
|
|
('.$this->nested_url_parenthesis_re.') # href = $4
|
|
)
|
|
[ \n]*
|
|
( # $5
|
|
([\'"]) # quote char = $6
|
|
(.*?) # Title = $7
|
|
\6 # matching quote
|
|
[ \n]* # ignore any spaces/tabs between closing quote and )
|
|
)? # title is optional
|
|
\)
|
|
)
|
|
}xs',
|
|
array($this, '_doAnchors_inline_callback'), $text);
|
|
|
|
// Last, handle reference-style shortcuts: [link text]
|
|
// These must come last in case you've also got [link text][1]
|
|
// or [link text](/foo)
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
\[
|
|
([^\[\]]+) # link text = $2; can\'t contain [ or ]
|
|
\]
|
|
)
|
|
}xs',
|
|
array($this, '_doAnchors_reference_callback'), $text);
|
|
|
|
$this->in_anchor = false;
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Callback method to parse referenced anchors
|
|
* @param string $matches
|
|
* @return string
|
|
*/
|
|
protected function _doAnchors_reference_callback($matches) {
|
|
$whole_match = $matches[1];
|
|
$link_text = $matches[2];
|
|
$link_id =& $matches[3];
|
|
|
|
if ($link_id == "") {
|
|
// for shortcut links like [this][] or [this].
|
|
$link_id = $link_text;
|
|
}
|
|
|
|
// lower-case and turn embedded newlines into spaces
|
|
$link_id = strtolower($link_id);
|
|
$link_id = preg_replace('{[ ]?\n}', ' ', $link_id);
|
|
|
|
if (isset($this->urls[$link_id])) {
|
|
$url = $this->urls[$link_id];
|
|
$url = $this->encodeURLAttribute($url);
|
|
|
|
$result = "<a href=\"$url\"";
|
|
if ( isset( $this->titles[$link_id] ) ) {
|
|
$title = $this->titles[$link_id];
|
|
$title = $this->encodeAttribute($title);
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
|
|
$link_text = $this->runSpanGamut($link_text);
|
|
$result .= ">$link_text</a>";
|
|
$result = $this->hashPart($result);
|
|
} else {
|
|
$result = $whole_match;
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Callback method to parse inline anchors
|
|
* @param string $matches
|
|
* @return string
|
|
*/
|
|
protected function _doAnchors_inline_callback($matches) {
|
|
$whole_match = $matches[1];
|
|
$link_text = $this->runSpanGamut($matches[2]);
|
|
$url = $matches[3] == '' ? $matches[4] : $matches[3];
|
|
$title =& $matches[7];
|
|
|
|
// If the URL was of the form <s p a c e s> it got caught by the HTML
|
|
// tag parser and hashed. Need to reverse the process before using
|
|
// the URL.
|
|
$unhashed = $this->unhash($url);
|
|
if ($unhashed != $url)
|
|
$url = preg_replace('/^<(.*)>$/', '\1', $unhashed);
|
|
|
|
$url = $this->encodeURLAttribute($url);
|
|
|
|
$result = "<a href=\"$url\"";
|
|
if (isset($title)) {
|
|
$title = $this->encodeAttribute($title);
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
|
|
$link_text = $this->runSpanGamut($link_text);
|
|
$result .= ">$link_text</a>";
|
|
|
|
return $this->hashPart($result);
|
|
}
|
|
|
|
/**
|
|
* Turn Markdown image shortcuts into <img> tags.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doImages($text) {
|
|
// First, handle reference-style labeled images: ![alt text][id]
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
!\[
|
|
('.$this->nested_brackets_re.') # alt text = $2
|
|
\]
|
|
|
|
[ ]? # one optional space
|
|
(?:\n[ ]*)? # one optional newline followed by spaces
|
|
|
|
\[
|
|
(.*?) # id = $3
|
|
\]
|
|
|
|
)
|
|
}xs',
|
|
array($this, '_doImages_reference_callback'), $text);
|
|
|
|
// Next, handle inline images: ![alt text](url "optional title")
|
|
// Don't forget: encode * and _
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
!\[
|
|
('.$this->nested_brackets_re.') # alt text = $2
|
|
\]
|
|
\s? # One optional whitespace character
|
|
\( # literal paren
|
|
[ \n]*
|
|
(?:
|
|
<(\S*)> # src url = $3
|
|
|
|
|
('.$this->nested_url_parenthesis_re.') # src url = $4
|
|
)
|
|
[ \n]*
|
|
( # $5
|
|
([\'"]) # quote char = $6
|
|
(.*?) # title = $7
|
|
\6 # matching quote
|
|
[ \n]*
|
|
)? # title is optional
|
|
\)
|
|
)
|
|
}xs',
|
|
array($this, '_doImages_inline_callback'), $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Callback to parse references image tags
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doImages_reference_callback($matches) {
|
|
$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 = $this->encodeAttribute($alt_text);
|
|
if (isset($this->urls[$link_id])) {
|
|
$url = $this->encodeURLAttribute($this->urls[$link_id]);
|
|
$result = "<img src=\"$url\" alt=\"$alt_text\"";
|
|
if (isset($this->titles[$link_id])) {
|
|
$title = $this->titles[$link_id];
|
|
$title = $this->encodeAttribute($title);
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
$result .= $this->empty_element_suffix;
|
|
$result = $this->hashPart($result);
|
|
} else {
|
|
// If there's no such link ID, leave intact:
|
|
$result = $whole_match;
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Callback to parse inline image tags
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doImages_inline_callback($matches) {
|
|
$whole_match = $matches[1];
|
|
$alt_text = $matches[2];
|
|
$url = $matches[3] == '' ? $matches[4] : $matches[3];
|
|
$title =& $matches[7];
|
|
|
|
$alt_text = $this->encodeAttribute($alt_text);
|
|
$url = $this->encodeURLAttribute($url);
|
|
$result = "<img src=\"$url\" alt=\"$alt_text\"";
|
|
if (isset($title)) {
|
|
$title = $this->encodeAttribute($title);
|
|
$result .= " title=\"$title\""; // $title already quoted
|
|
}
|
|
$result .= $this->empty_element_suffix;
|
|
|
|
return $this->hashPart($result);
|
|
}
|
|
|
|
/**
|
|
* Parse Markdown heading elements to HTML
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doHeaders($text) {
|
|
/**
|
|
* Setext-style headers:
|
|
* Header 1
|
|
* ========
|
|
*
|
|
* Header 2
|
|
* --------
|
|
*/
|
|
$text = preg_replace_callback('{ ^(.+?)[ ]*\n(=+|-+)[ ]*\n+ }mx',
|
|
array($this, '_doHeaders_callback_setext'), $text);
|
|
|
|
/**
|
|
* atx-style headers:
|
|
* # Header 1
|
|
* ## Header 2
|
|
* ## Header 2 with closing hashes ##
|
|
* ...
|
|
* ###### Header 6
|
|
*/
|
|
$text = preg_replace_callback('{
|
|
^(\#{1,6}) # $1 = string of #\'s
|
|
[ ]*
|
|
(.+?) # $2 = Header text
|
|
[ ]*
|
|
\#* # optional closing #\'s (not counted)
|
|
\n+
|
|
}xm',
|
|
array($this, '_doHeaders_callback_atx'), $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Setext header parsing callback
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doHeaders_callback_setext($matches) {
|
|
// Terrible hack to check we haven't found an empty list item.
|
|
if ($matches[2] == '-' && preg_match('{^-(?: |$)}', $matches[1])) {
|
|
return $matches[0];
|
|
}
|
|
|
|
$level = $matches[2]{0} == '=' ? 1 : 2;
|
|
|
|
// ID attribute generation
|
|
$idAtt = $this->_generateIdFromHeaderValue($matches[1]);
|
|
|
|
$block = "<h$level$idAtt>".$this->runSpanGamut($matches[1])."</h$level>";
|
|
return "\n" . $this->hashBlock($block) . "\n\n";
|
|
}
|
|
|
|
/**
|
|
* ATX header parsing callback
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doHeaders_callback_atx($matches) {
|
|
// ID attribute generation
|
|
$idAtt = $this->_generateIdFromHeaderValue($matches[2]);
|
|
|
|
$level = strlen($matches[1]);
|
|
$block = "<h$level$idAtt>".$this->runSpanGamut($matches[2])."</h$level>";
|
|
return "\n" . $this->hashBlock($block) . "\n\n";
|
|
}
|
|
|
|
/**
|
|
* If a header_id_func property is set, we can use it to automatically
|
|
* generate an id attribute.
|
|
*
|
|
* This method returns a string in the form id="foo", or an empty string
|
|
* otherwise.
|
|
* @param string $headerValue
|
|
* @return string
|
|
*/
|
|
protected function _generateIdFromHeaderValue($headerValue) {
|
|
if (!is_callable($this->header_id_func)) {
|
|
return "";
|
|
}
|
|
|
|
$idValue = call_user_func($this->header_id_func, $headerValue);
|
|
if (!$idValue) {
|
|
return "";
|
|
}
|
|
|
|
return ' id="' . $this->encodeAttribute($idValue) . '"';
|
|
}
|
|
|
|
/**
|
|
* Form HTML ordered (numbered) and unordered (bulleted) lists.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doLists($text) {
|
|
$less_than_tab = $this->tab_width - 1;
|
|
|
|
// Re-usable patterns to match list item bullets and number markers:
|
|
$marker_ul_re = '[*+-]';
|
|
$marker_ol_re = '\d+[\.]';
|
|
|
|
$markers_relist = array(
|
|
$marker_ul_re => $marker_ol_re,
|
|
$marker_ol_re => $marker_ul_re,
|
|
);
|
|
|
|
foreach ($markers_relist as $marker_re => $other_marker_re) {
|
|
// Re-usable pattern to match any entirel ul or ol list:
|
|
$whole_list_re = '
|
|
( # $1 = whole list
|
|
( # $2
|
|
([ ]{0,'.$less_than_tab.'}) # $3 = number of spaces
|
|
('.$marker_re.') # $4 = first list item marker
|
|
[ ]+
|
|
)
|
|
(?s:.+?)
|
|
( # $5
|
|
\z
|
|
|
|
|
\n{2,}
|
|
(?=\S)
|
|
(?! # Negative lookahead for another list item marker
|
|
[ ]*
|
|
'.$marker_re.'[ ]+
|
|
)
|
|
|
|
|
(?= # Lookahead for another kind of list
|
|
\n
|
|
\3 # Must have the same indentation
|
|
'.$other_marker_re.'[ ]+
|
|
)
|
|
)
|
|
)
|
|
'; // mx
|
|
|
|
// We use a different prefix before nested lists than top-level lists.
|
|
//See extended comment in _ProcessListItems().
|
|
|
|
if ($this->list_level) {
|
|
$text = preg_replace_callback('{
|
|
^
|
|
'.$whole_list_re.'
|
|
}mx',
|
|
array($this, '_doLists_callback'), $text);
|
|
} else {
|
|
$text = preg_replace_callback('{
|
|
(?:(?<=\n)\n|\A\n?) # Must eat the newline
|
|
'.$whole_list_re.'
|
|
}mx',
|
|
array($this, '_doLists_callback'), $text);
|
|
}
|
|
}
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* List parsing callback
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doLists_callback($matches) {
|
|
// Re-usable patterns to match list item bullets and number markers:
|
|
$marker_ul_re = '[*+-]';
|
|
$marker_ol_re = '\d+[\.]';
|
|
$marker_any_re = "(?:$marker_ul_re|$marker_ol_re)";
|
|
$marker_ol_start_re = '[0-9]+';
|
|
|
|
$list = $matches[1];
|
|
$list_type = preg_match("/$marker_ul_re/", $matches[4]) ? "ul" : "ol";
|
|
|
|
$marker_any_re = ( $list_type == "ul" ? $marker_ul_re : $marker_ol_re );
|
|
|
|
$list .= "\n";
|
|
$result = $this->processListItems($list, $marker_any_re);
|
|
|
|
$ol_start = 1;
|
|
if ($this->enhanced_ordered_list) {
|
|
// Get the start number for ordered list.
|
|
if ($list_type == 'ol') {
|
|
$ol_start_array = array();
|
|
$ol_start_check = preg_match("/$marker_ol_start_re/", $matches[4], $ol_start_array);
|
|
if ($ol_start_check){
|
|
$ol_start = $ol_start_array[0];
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($ol_start > 1 && $list_type == 'ol'){
|
|
$result = $this->hashBlock("<$list_type start=\"$ol_start\">\n" . $result . "</$list_type>");
|
|
} else {
|
|
$result = $this->hashBlock("<$list_type>\n" . $result . "</$list_type>");
|
|
}
|
|
return "\n". $result ."\n\n";
|
|
}
|
|
|
|
/**
|
|
* Nesting tracker for list levels
|
|
* @var integer
|
|
*/
|
|
protected $list_level = 0;
|
|
|
|
/**
|
|
* Process the contents of a single ordered or unordered list, splitting it
|
|
* into individual list items.
|
|
* @param string $list_str
|
|
* @param string $marker_any_re
|
|
* @return string
|
|
*/
|
|
protected function processListItems($list_str, $marker_any_re) {
|
|
/**
|
|
* The $this->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.".
|
|
*/
|
|
$this->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
|
|
(^[ ]*) # leading whitespace = $2
|
|
('.$marker_any_re.' # list marker and space = $3
|
|
(?:[ ]+|(?=\n)) # space only required if item is not empty
|
|
)
|
|
((?s:.*?)) # list item text = $4
|
|
(?:(\n+(?=\n))|\n) # tailing blank line = $5
|
|
(?= \n* (\z | \2 ('.$marker_any_re.') (?:[ ]+|(?=\n))))
|
|
}xm',
|
|
array($this, '_processListItems_callback'), $list_str);
|
|
|
|
$this->list_level--;
|
|
return $list_str;
|
|
}
|
|
|
|
/**
|
|
* List item parsing callback
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _processListItems_callback($matches) {
|
|
$item = $matches[4];
|
|
$leading_line =& $matches[1];
|
|
$leading_space =& $matches[2];
|
|
$marker_space = $matches[3];
|
|
$tailing_blank_line =& $matches[5];
|
|
|
|
if ($leading_line || $tailing_blank_line ||
|
|
preg_match('/\n{2,}/', $item))
|
|
{
|
|
// Replace marker with the appropriate whitespace indentation
|
|
$item = $leading_space . str_repeat(' ', strlen($marker_space)) . $item;
|
|
$item = $this->runBlockGamut($this->outdent($item)."\n");
|
|
} else {
|
|
// Recursion for sub-lists:
|
|
$item = $this->doLists($this->outdent($item));
|
|
$item = $this->formParagraphs($item, false);
|
|
}
|
|
|
|
return "<li>" . $item . "</li>\n";
|
|
}
|
|
|
|
/**
|
|
* Process Markdown `<pre><code>` blocks.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doCodeBlocks($text) {
|
|
$text = preg_replace_callback('{
|
|
(?:\n\n|\A\n?)
|
|
( # $1 = the code block -- one or more lines, starting with a space/tab
|
|
(?>
|
|
[ ]{'.$this->tab_width.'} # Lines must start with a tab or a tab-width of spaces
|
|
.*\n+
|
|
)+
|
|
)
|
|
((?=^[ ]{0,'.$this->tab_width.'}\S)|\Z) # Lookahead for non-space at line-start, or end of doc
|
|
}xm',
|
|
array($this, '_doCodeBlocks_callback'), $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Code block parsing callback
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doCodeBlocks_callback($matches) {
|
|
$codeblock = $matches[1];
|
|
|
|
$codeblock = $this->outdent($codeblock);
|
|
if ($this->code_block_content_func) {
|
|
$codeblock = call_user_func($this->code_block_content_func, $codeblock, "");
|
|
} else {
|
|
$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
|
|
}
|
|
|
|
# trim leading newlines and trailing newlines
|
|
$codeblock = preg_replace('/\A\n+|\n+\z/', '', $codeblock);
|
|
|
|
$codeblock = "<pre><code>$codeblock\n</code></pre>";
|
|
return "\n\n" . $this->hashBlock($codeblock) . "\n\n";
|
|
}
|
|
|
|
/**
|
|
* Create a code span markup for $code. Called from handleSpanToken.
|
|
* @param string $code
|
|
* @return string
|
|
*/
|
|
protected function makeCodeSpan($code) {
|
|
if ($this->code_span_content_func) {
|
|
$code = call_user_func($this->code_span_content_func, $code);
|
|
} else {
|
|
$code = htmlspecialchars(trim($code), ENT_NOQUOTES);
|
|
}
|
|
return $this->hashPart("<code>$code</code>");
|
|
}
|
|
|
|
/**
|
|
* Define the emphasis operators with their regex matches
|
|
* @var array
|
|
*/
|
|
protected $em_relist = array(
|
|
'' => '(?:(?<!\*)\*(?!\*)|(?<!_)_(?!_))(?![\.,:;]?\s)',
|
|
'*' => '(?<![\s*])\*(?!\*)',
|
|
'_' => '(?<![\s_])_(?!_)',
|
|
);
|
|
|
|
/**
|
|
* Define the strong operators with their regex matches
|
|
* @var array
|
|
*/
|
|
protected $strong_relist = array(
|
|
'' => '(?:(?<!\*)\*\*(?!\*)|(?<!_)__(?!_))(?![\.,:;]?\s)',
|
|
'**' => '(?<![\s*])\*\*(?!\*)',
|
|
'__' => '(?<![\s_])__(?!_)',
|
|
);
|
|
|
|
/**
|
|
* Define the emphasis + strong operators with their regex matches
|
|
* @var array
|
|
*/
|
|
protected $em_strong_relist = array(
|
|
'' => '(?:(?<!\*)\*\*\*(?!\*)|(?<!_)___(?!_))(?![\.,:;]?\s)',
|
|
'***' => '(?<![\s*])\*\*\*(?!\*)',
|
|
'___' => '(?<![\s_])___(?!_)',
|
|
);
|
|
|
|
/**
|
|
* Container for prepared regular expressions
|
|
* @var array
|
|
*/
|
|
protected $em_strong_prepared_relist;
|
|
|
|
/**
|
|
* Prepare regular expressions for searching emphasis tokens in any
|
|
* context.
|
|
* @return void
|
|
*/
|
|
protected function prepareItalicsAndBold() {
|
|
foreach ($this->em_relist as $em => $em_re) {
|
|
foreach ($this->strong_relist as $strong => $strong_re) {
|
|
// Construct list of allowed token expressions.
|
|
$token_relist = array();
|
|
if (isset($this->em_strong_relist["$em$strong"])) {
|
|
$token_relist[] = $this->em_strong_relist["$em$strong"];
|
|
}
|
|
$token_relist[] = $em_re;
|
|
$token_relist[] = $strong_re;
|
|
|
|
// Construct master expression from list.
|
|
$token_re = '{(' . implode('|', $token_relist) . ')}';
|
|
$this->em_strong_prepared_relist["$em$strong"] = $token_re;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Convert Markdown italics (emphasis) and bold (strong) to HTML
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doItalicsAndBold($text) {
|
|
if ($this->in_emphasis_processing) {
|
|
return $text; // avoid reentrency
|
|
}
|
|
$this->in_emphasis_processing = true;
|
|
|
|
$token_stack = array('');
|
|
$text_stack = array('');
|
|
$em = '';
|
|
$strong = '';
|
|
$tree_char_em = false;
|
|
|
|
while (1) {
|
|
// Get prepared regular expression for seraching emphasis tokens
|
|
// in current context.
|
|
$token_re = $this->em_strong_prepared_relist["$em$strong"];
|
|
|
|
// Each loop iteration search for the next emphasis token.
|
|
// Each token is then passed to handleSpanToken.
|
|
$parts = preg_split($token_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
|
|
$text_stack[0] .= $parts[0];
|
|
$token =& $parts[1];
|
|
$text =& $parts[2];
|
|
|
|
if (empty($token)) {
|
|
// Reached end of text span: empty stack without emitting.
|
|
// any more emphasis.
|
|
while ($token_stack[0]) {
|
|
$text_stack[1] .= array_shift($token_stack);
|
|
$text_stack[0] .= array_shift($text_stack);
|
|
}
|
|
break;
|
|
}
|
|
|
|
$token_len = strlen($token);
|
|
if ($tree_char_em) {
|
|
// Reached closing marker while inside a three-char emphasis.
|
|
if ($token_len == 3) {
|
|
// Three-char closing marker, close em and strong.
|
|
array_shift($token_stack);
|
|
$span = array_shift($text_stack);
|
|
$span = $this->runSpanGamut($span);
|
|
$span = "<strong><em>$span</em></strong>";
|
|
$text_stack[0] .= $this->hashPart($span);
|
|
$em = '';
|
|
$strong = '';
|
|
} else {
|
|
// Other closing marker: close one em or strong and
|
|
// change current token state to match the other
|
|
$token_stack[0] = str_repeat($token{0}, 3-$token_len);
|
|
$tag = $token_len == 2 ? "strong" : "em";
|
|
$span = $text_stack[0];
|
|
$span = $this->runSpanGamut($span);
|
|
$span = "<$tag>$span</$tag>";
|
|
$text_stack[0] = $this->hashPart($span);
|
|
$$tag = ''; // $$tag stands for $em or $strong
|
|
}
|
|
$tree_char_em = false;
|
|
} else if ($token_len == 3) {
|
|
if ($em) {
|
|
// Reached closing marker for both em and strong.
|
|
// Closing strong marker:
|
|
for ($i = 0; $i < 2; ++$i) {
|
|
$shifted_token = array_shift($token_stack);
|
|
$tag = strlen($shifted_token) == 2 ? "strong" : "em";
|
|
$span = array_shift($text_stack);
|
|
$span = $this->runSpanGamut($span);
|
|
$span = "<$tag>$span</$tag>";
|
|
$text_stack[0] .= $this->hashPart($span);
|
|
$$tag = ''; // $$tag stands for $em or $strong
|
|
}
|
|
} else {
|
|
// Reached opening three-char emphasis marker. Push on token
|
|
// stack; will be handled by the special condition above.
|
|
$em = $token{0};
|
|
$strong = "$em$em";
|
|
array_unshift($token_stack, $token);
|
|
array_unshift($text_stack, '');
|
|
$tree_char_em = true;
|
|
}
|
|
} else if ($token_len == 2) {
|
|
if ($strong) {
|
|
// Unwind any dangling emphasis marker:
|
|
if (strlen($token_stack[0]) == 1) {
|
|
$text_stack[1] .= array_shift($token_stack);
|
|
$text_stack[0] .= array_shift($text_stack);
|
|
$em = '';
|
|
}
|
|
// Closing strong marker:
|
|
array_shift($token_stack);
|
|
$span = array_shift($text_stack);
|
|
$span = $this->runSpanGamut($span);
|
|
$span = "<strong>$span</strong>";
|
|
$text_stack[0] .= $this->hashPart($span);
|
|
$strong = '';
|
|
} else {
|
|
array_unshift($token_stack, $token);
|
|
array_unshift($text_stack, '');
|
|
$strong = $token;
|
|
}
|
|
} else {
|
|
// Here $token_len == 1
|
|
if ($em) {
|
|
if (strlen($token_stack[0]) == 1) {
|
|
// Closing emphasis marker:
|
|
array_shift($token_stack);
|
|
$span = array_shift($text_stack);
|
|
$span = $this->runSpanGamut($span);
|
|
$span = "<em>$span</em>";
|
|
$text_stack[0] .= $this->hashPart($span);
|
|
$em = '';
|
|
} else {
|
|
$text_stack[0] .= $token;
|
|
}
|
|
} else {
|
|
array_unshift($token_stack, $token);
|
|
array_unshift($text_stack, '');
|
|
$em = $token;
|
|
}
|
|
}
|
|
}
|
|
$this->in_emphasis_processing = false;
|
|
return $text_stack[0];
|
|
}
|
|
|
|
/**
|
|
* Parse Markdown blockquotes to HTML
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doBlockQuotes($text) {
|
|
$text = preg_replace_callback('/
|
|
( # Wrap whole match in $1
|
|
(?>
|
|
^[ ]*>[ ]? # ">" at the start of a line
|
|
.+\n # rest of the first line
|
|
(.+\n)* # subsequent consecutive lines
|
|
\n* # blanks
|
|
)+
|
|
)
|
|
/xm',
|
|
array($this, '_doBlockQuotes_callback'), $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Blockquote parsing callback
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doBlockQuotes_callback($matches) {
|
|
$bq = $matches[1];
|
|
// trim one level of quoting - trim whitespace-only lines
|
|
$bq = preg_replace('/^[ ]*>[ ]?|^[ ]+$/m', '', $bq);
|
|
$bq = $this->runBlockGamut($bq); // recurse
|
|
|
|
$bq = preg_replace('/^/m', " ", $bq);
|
|
// These leading spaces cause problem with <pre> content,
|
|
// so we need to fix that:
|
|
$bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx',
|
|
array($this, '_doBlockQuotes_callback2'), $bq);
|
|
|
|
return "\n" . $this->hashBlock("<blockquote>\n$bq\n</blockquote>") . "\n\n";
|
|
}
|
|
|
|
/**
|
|
* Blockquote parsing callback
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doBlockQuotes_callback2($matches) {
|
|
$pre = $matches[1];
|
|
$pre = preg_replace('/^ /m', '', $pre);
|
|
return $pre;
|
|
}
|
|
|
|
/**
|
|
* Parse paragraphs
|
|
*
|
|
* @param string $text String to process in paragraphs
|
|
* @param boolean $wrap_in_p Whether paragraphs should be wrapped in <p> tags
|
|
* @return string
|
|
*/
|
|
protected function formParagraphs($text, $wrap_in_p = true) {
|
|
// Strip leading and trailing lines:
|
|
$text = preg_replace('/\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 => $value) {
|
|
if (!preg_match('/^B\x1A[0-9]+B$/', $value)) {
|
|
// Is a paragraph.
|
|
$value = $this->runSpanGamut($value);
|
|
if ($wrap_in_p) {
|
|
$value = preg_replace('/^([ ]*)/', "<p>", $value);
|
|
$value .= "</p>";
|
|
}
|
|
$grafs[$key] = $this->unhash($value);
|
|
} else {
|
|
// Is a block.
|
|
// Modify elements of @grafs in-place...
|
|
$graf = $value;
|
|
$block = $this->html_hashes[$graf];
|
|
$graf = $block;
|
|
// if (preg_match('{
|
|
// \A
|
|
// ( # $1 = <div> tag
|
|
// <div \s+
|
|
// [^>]*
|
|
// \b
|
|
// markdown\s*=\s* ([\'"]) # $2 = attr quote char
|
|
// 1
|
|
// \2
|
|
// [^>]*
|
|
// >
|
|
// )
|
|
// ( # $3 = contents
|
|
// .*
|
|
// )
|
|
// (</div>) # $4 = closing tag
|
|
// \z
|
|
// }xs', $block, $matches))
|
|
// {
|
|
// list(, $div_open, , $div_content, $div_close) = $matches;
|
|
//
|
|
// // We can't call Markdown(), because that resets the hash;
|
|
// // that initialization code should be pulled into its own sub, though.
|
|
// $div_content = $this->hashHTMLBlocks($div_content);
|
|
//
|
|
// // Run document gamut methods on the content.
|
|
// foreach ($this->document_gamut as $method => $priority) {
|
|
// $div_content = $this->$method($div_content);
|
|
// }
|
|
//
|
|
// $div_open = preg_replace(
|
|
// '{\smarkdown\s*=\s*([\'"]).+?\1}', '', $div_open);
|
|
//
|
|
// $graf = $div_open . "\n" . $div_content . "\n" . $div_close;
|
|
// }
|
|
$grafs[$key] = $graf;
|
|
}
|
|
}
|
|
|
|
return implode("\n\n", $grafs);
|
|
}
|
|
|
|
/**
|
|
* Encode text for a double-quoted HTML attribute. This function
|
|
* is *not* suitable for attributes enclosed in single quotes.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function encodeAttribute($text) {
|
|
$text = $this->encodeAmpsAndAngles($text);
|
|
$text = str_replace('"', '"', $text);
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Encode text for a double-quoted HTML attribute containing a URL,
|
|
* applying the URL filter if set. Also generates the textual
|
|
* representation for the URL (removing mailto: or tel:) storing it in $text.
|
|
* This function is *not* suitable for attributes enclosed in single quotes.
|
|
*
|
|
* @param string $url
|
|
* @param string &$text Passed by reference
|
|
* @return string URL
|
|
*/
|
|
protected function encodeURLAttribute($url, &$text = null) {
|
|
if ($this->url_filter_func) {
|
|
$url = call_user_func($this->url_filter_func, $url);
|
|
}
|
|
|
|
if (preg_match('{^mailto:}i', $url)) {
|
|
$url = $this->encodeEntityObfuscatedAttribute($url, $text, 7);
|
|
} else if (preg_match('{^tel:}i', $url)) {
|
|
$url = $this->encodeAttribute($url);
|
|
$text = substr($url, 4);
|
|
} else {
|
|
$url = $this->encodeAttribute($url);
|
|
$text = $url;
|
|
}
|
|
|
|
return $url;
|
|
}
|
|
|
|
/**
|
|
* Smart processing for ampersands and angle brackets that need to
|
|
* be encoded. Valid character entities are left alone unless the
|
|
* no-entities mode is set.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function encodeAmpsAndAngles($text) {
|
|
if ($this->no_entities) {
|
|
$text = str_replace('&', '&', $text);
|
|
} else {
|
|
// 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 remaining <'s
|
|
$text = str_replace('<', '<', $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Parse Markdown automatic links to anchor HTML tags
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doAutoLinks($text) {
|
|
$text = preg_replace_callback('{<((https?|ftp|dict|tel):[^\'">\s]+)>}i',
|
|
array($this, '_doAutoLinks_url_callback'), $text);
|
|
|
|
// Email addresses: <address@domain.foo>
|
|
$text = preg_replace_callback('{
|
|
<
|
|
(?:mailto:)?
|
|
(
|
|
(?:
|
|
[-!#$%&\'*+/=?^_`.{|}~\w\x80-\xFF]+
|
|
|
|
|
".*?"
|
|
)
|
|
\@
|
|
(?:
|
|
[-a-z0-9\x80-\xFF]+(\.[-a-z0-9\x80-\xFF]+)*\.[a-z]+
|
|
|
|
|
\[[\d.a-fA-F:]+\] # IPv4 & IPv6
|
|
)
|
|
)
|
|
>
|
|
}xi',
|
|
array($this, '_doAutoLinks_email_callback'), $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Parse URL callback
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doAutoLinks_url_callback($matches) {
|
|
$url = $this->encodeURLAttribute($matches[1], $text);
|
|
$link = "<a href=\"$url\">$text</a>";
|
|
return $this->hashPart($link);
|
|
}
|
|
|
|
/**
|
|
* Parse email address callback
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doAutoLinks_email_callback($matches) {
|
|
$addr = $matches[1];
|
|
$url = $this->encodeURLAttribute("mailto:$addr", $text);
|
|
$link = "<a href=\"$url\">$text</a>";
|
|
return $this->hashPart($link);
|
|
}
|
|
|
|
/**
|
|
* Input: some text to obfuscate, e.g. "mailto:foo@example.com"
|
|
*
|
|
* Output: the same text but with most characters encoded as either a
|
|
* decimal or hex entity, in the hopes of foiling most address
|
|
* harvesting spam bots. E.g.:
|
|
*
|
|
* mailto:foo
|
|
* @example.co
|
|
* m
|
|
*
|
|
* Note: the additional output $tail is assigned the same value as the
|
|
* ouput, minus the number of characters specified by $head_length.
|
|
*
|
|
* Based by a filter by Matthew Wickline, posted to BBEdit-Talk.
|
|
* With some optimizations by Milian Wolff. Forced encoding of HTML
|
|
* attribute special characters by Allan Odgaard.
|
|
*
|
|
* @param string $text
|
|
* @param string &$tail
|
|
* @param integer $head_length
|
|
* @return string
|
|
*/
|
|
protected function encodeEntityObfuscatedAttribute($text, &$tail = null, $head_length = 0) {
|
|
if ($text == "") {
|
|
return $tail = "";
|
|
}
|
|
|
|
$chars = preg_split('/(?<!^)(?!$)/', $text);
|
|
$seed = (int)abs(crc32($text) / strlen($text)); // Deterministic seed.
|
|
|
|
foreach ($chars as $key => $char) {
|
|
$ord = ord($char);
|
|
// Ignore non-ascii chars.
|
|
if ($ord < 128) {
|
|
$r = ($seed * (1 + $key)) % 100; // Pseudo-random function.
|
|
// roughly 10% raw, 45% hex, 45% dec
|
|
// '@' *must* be encoded. I insist.
|
|
// '"' and '>' have to be encoded inside the attribute
|
|
if ($r > 90 && strpos('@"&>', $char) === false) {
|
|
/* do nothing */
|
|
} else if ($r < 45) {
|
|
$chars[$key] = '&#x'.dechex($ord).';';
|
|
} else {
|
|
$chars[$key] = '&#'.$ord.';';
|
|
}
|
|
}
|
|
}
|
|
|
|
$text = implode('', $chars);
|
|
$tail = $head_length ? implode('', array_slice($chars, $head_length)) : $text;
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Take the string $str and parse it into tokens, hashing embeded HTML,
|
|
* escaped characters and handling code spans.
|
|
* @param string $str
|
|
* @return string
|
|
*/
|
|
protected function parseSpan($str) {
|
|
$output = '';
|
|
|
|
$span_re = '{
|
|
(
|
|
\\\\'.$this->escape_chars_re.'
|
|
|
|
|
(?<![`\\\\])
|
|
`+ # code span marker
|
|
'.( $this->no_markup ? '' : '
|
|
|
|
|
<!-- .*? --> # comment
|
|
|
|
|
<\?.*?\?> | <%.*?%> # processing instruction
|
|
|
|
|
<[!$]?[-a-zA-Z0-9:_]+ # regular tags
|
|
(?>
|
|
\s
|
|
(?>[^"\'>]+|"[^"]*"|\'[^\']*\')*
|
|
)?
|
|
>
|
|
|
|
|
<[-a-zA-Z0-9:_]+\s*/> # xml-style empty tag
|
|
|
|
|
</[-a-zA-Z0-9:_]+\s*> # closing tag
|
|
').'
|
|
)
|
|
}xs';
|
|
|
|
while (1) {
|
|
// Each loop iteration seach for either the next tag, the next
|
|
// openning code span marker, or the next escaped character.
|
|
// Each token is then passed to handleSpanToken.
|
|
$parts = preg_split($span_re, $str, 2, PREG_SPLIT_DELIM_CAPTURE);
|
|
|
|
// Create token from text preceding tag.
|
|
if ($parts[0] != "") {
|
|
$output .= $parts[0];
|
|
}
|
|
|
|
// Check if we reach the end.
|
|
if (isset($parts[1])) {
|
|
$output .= $this->handleSpanToken($parts[1], $parts[2]);
|
|
$str = $parts[2];
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return $output;
|
|
}
|
|
|
|
/**
|
|
* Handle $token provided by parseSpan by determining its nature and
|
|
* returning the corresponding value that should replace it.
|
|
* @param string $token
|
|
* @param string &$str
|
|
* @return string
|
|
*/
|
|
protected function handleSpanToken($token, &$str) {
|
|
switch ($token{0}) {
|
|
case "\\":
|
|
return $this->hashPart("&#". ord($token{1}). ";");
|
|
case "`":
|
|
// Search for end marker in remaining text.
|
|
if (preg_match('/^(.*?[^`])'.preg_quote($token).'(?!`)(.*)$/sm',
|
|
$str, $matches))
|
|
{
|
|
$str = $matches[2];
|
|
$codespan = $this->makeCodeSpan($matches[1]);
|
|
return $this->hashPart($codespan);
|
|
}
|
|
return $token; // Return as text since no ending marker found.
|
|
default:
|
|
return $this->hashPart($token);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Remove one level of line-leading tabs or spaces
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function outdent($text) {
|
|
return preg_replace('/^(\t|[ ]{1,' . $this->tab_width . '})/m', '', $text);
|
|
}
|
|
|
|
|
|
/**
|
|
* String length function for detab. `_initDetab` will create a function to
|
|
* handle UTF-8 if the default function does not exist.
|
|
* @var string
|
|
*/
|
|
protected $utf8_strlen = 'mb_strlen';
|
|
|
|
/**
|
|
* Replace tabs with the appropriate amount of spaces.
|
|
*
|
|
* 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.
|
|
*
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function detab($text) {
|
|
$text = preg_replace_callback('/^.*\t.*$/m',
|
|
array($this, '_detab_callback'), $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Replace tabs callback
|
|
* @param string $matches
|
|
* @return string
|
|
*/
|
|
protected function _detab_callback($matches) {
|
|
$line = $matches[0];
|
|
$strlen = $this->utf8_strlen; // strlen function for UTF-8.
|
|
|
|
// 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 = $this->tab_width -
|
|
$strlen($line, 'UTF-8') % $this->tab_width;
|
|
$line .= str_repeat(" ", $amount) . $block;
|
|
}
|
|
return $line;
|
|
}
|
|
|
|
/**
|
|
* Check for the availability of the function in the `utf8_strlen` property
|
|
* (initially `mb_strlen`). If the function is not available, create a
|
|
* function that will loosely count the number of UTF-8 characters with a
|
|
* regular expression.
|
|
* @return void
|
|
*/
|
|
protected function _initDetab() {
|
|
|
|
if (function_exists($this->utf8_strlen)) {
|
|
return;
|
|
}
|
|
|
|
$this->utf8_strlen = function($text) {
|
|
return preg_match_all('/[\x00-\xBF]|[\xC0-\xFF][\x80-\xBF]*/', $text, $m);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Swap back in all the tags hashed by _HashHTMLBlocks.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function unhash($text) {
|
|
return preg_replace_callback('/(.)\x1A[0-9]+\1/',
|
|
array($this, '_unhash_callback'), $text);
|
|
}
|
|
|
|
/**
|
|
* Unhashing callback
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _unhash_callback($matches) {
|
|
return $this->html_hashes[$matches[0]];
|
|
}
|
|
}
|
|
|
|
class MarkdownExtraParser extends MarkdownParser {
|
|
/**
|
|
* Configuration variables
|
|
*/
|
|
|
|
/**
|
|
* Prefix for footnote ids.
|
|
* @var string
|
|
*/
|
|
public $fn_id_prefix = "";
|
|
|
|
/**
|
|
* Optional title attribute for footnote links and backlinks.
|
|
* @var string
|
|
*/
|
|
public $fn_link_title = "";
|
|
public $fn_backlink_title = "";
|
|
|
|
/**
|
|
* Optional class attribute for footnote links and backlinks.
|
|
* @var string
|
|
*/
|
|
public $fn_link_class = "footnote-ref";
|
|
public $fn_backlink_class = "footnote-backref";
|
|
|
|
/**
|
|
* Content to be displayed within footnote backlinks. The default is '↩';
|
|
* the U+FE0E on the end is a Unicode variant selector used to prevent iOS
|
|
* from displaying the arrow character as an emoji.
|
|
* @var string
|
|
*/
|
|
public $fn_backlink_html = '↩︎';
|
|
|
|
/**
|
|
* Class name for table cell alignment (%% replaced left/center/right)
|
|
* For instance: 'go-%%' becomes 'go-left' or 'go-right' or 'go-center'
|
|
* If empty, the align attribute is used instead of a class name.
|
|
* @var string
|
|
*/
|
|
public $table_align_class_tmpl = '';
|
|
|
|
/**
|
|
* Optional class prefix for fenced code block.
|
|
* @var string
|
|
*/
|
|
public $code_class_prefix = "";
|
|
|
|
/**
|
|
* Class attribute for code blocks goes on the `code` tag;
|
|
* setting this to true will put attributes on the `pre` tag instead.
|
|
* @var boolean
|
|
*/
|
|
public $code_attr_on_pre = false;
|
|
|
|
/**
|
|
* Predefined abbreviations.
|
|
* @var array
|
|
*/
|
|
public $predef_abbr = array();
|
|
|
|
/**
|
|
* Only convert atx-style headers if there's a space between the header and #
|
|
* @var boolean
|
|
*/
|
|
public $hashtag_protection = false;
|
|
|
|
/**
|
|
* Parser implementation
|
|
*/
|
|
|
|
/**
|
|
* Constructor function. Initialize the parser object.
|
|
* @return void
|
|
*/
|
|
public function __construct() {
|
|
// Add extra escapable characters before parent constructor
|
|
// initialize the table.
|
|
$this->escape_chars .= ':|';
|
|
|
|
// Insert extra document, block, and span transformations.
|
|
// Parent constructor will do the sorting.
|
|
$this->document_gamut += array(
|
|
"doFencedCodeBlocks" => 5,
|
|
"stripFootnotes" => 15,
|
|
"stripAbbreviations" => 25,
|
|
"appendFootnotes" => 50,
|
|
);
|
|
$this->block_gamut += array(
|
|
"doFencedCodeBlocks" => 5,
|
|
"doTables" => 15,
|
|
"doDefLists" => 45,
|
|
);
|
|
$this->span_gamut += array(
|
|
"doFootnotes" => 5,
|
|
"doAbbreviations" => 70,
|
|
);
|
|
|
|
$this->enhanced_ordered_list = true;
|
|
parent::__construct();
|
|
}
|
|
|
|
|
|
/**
|
|
* Extra variables used during extra transformations.
|
|
* @var array
|
|
*/
|
|
protected $footnotes = array();
|
|
protected $footnotes_ordered = array();
|
|
protected $footnotes_ref_count = array();
|
|
protected $footnotes_numbers = array();
|
|
protected $abbr_desciptions = array();
|
|
/** @var string */
|
|
protected $abbr_word_re = '';
|
|
|
|
/**
|
|
* Give the current footnote number.
|
|
* @var integer
|
|
*/
|
|
protected $footnote_counter = 1;
|
|
|
|
/**
|
|
* Setting up Extra-specific variables.
|
|
*/
|
|
protected function setup() {
|
|
parent::setup();
|
|
|
|
$this->footnotes = array();
|
|
$this->footnotes_ordered = array();
|
|
$this->footnotes_ref_count = array();
|
|
$this->footnotes_numbers = array();
|
|
$this->abbr_desciptions = array();
|
|
$this->abbr_word_re = '';
|
|
$this->footnote_counter = 1;
|
|
|
|
foreach ($this->predef_abbr as $abbr_word => $abbr_desc) {
|
|
if ($this->abbr_word_re)
|
|
$this->abbr_word_re .= '|';
|
|
$this->abbr_word_re .= preg_quote($abbr_word);
|
|
$this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Clearing Extra-specific variables.
|
|
*/
|
|
protected function teardown() {
|
|
$this->footnotes = array();
|
|
$this->footnotes_ordered = array();
|
|
$this->footnotes_ref_count = array();
|
|
$this->footnotes_numbers = array();
|
|
$this->abbr_desciptions = array();
|
|
$this->abbr_word_re = '';
|
|
|
|
parent::teardown();
|
|
}
|
|
|
|
|
|
/**
|
|
* Extra attribute parser
|
|
*/
|
|
|
|
/**
|
|
* Expression to use to catch attributes (includes the braces)
|
|
* @var string
|
|
*/
|
|
protected $id_class_attr_catch_re = '\{((?>[ ]*[#.a-z][-_:a-zA-Z0-9=]+){1,})[ ]*\}';
|
|
|
|
/**
|
|
* Expression to use when parsing in a context when no capture is desired
|
|
* @var string
|
|
*/
|
|
protected $id_class_attr_nocatch_re = '\{(?>[ ]*[#.a-z][-_:a-zA-Z0-9=]+){1,}[ ]*\}';
|
|
|
|
/**
|
|
* Parse attributes caught by the $this->id_class_attr_catch_re expression
|
|
* and return the HTML-formatted list of attributes.
|
|
*
|
|
* Currently supported attributes are .class and #id.
|
|
*
|
|
* In addition, this method also supports supplying a default Id value,
|
|
* which will be used to populate the id attribute in case it was not
|
|
* overridden.
|
|
* @param string $tag_name
|
|
* @param string $attr
|
|
* @param mixed $defaultIdValue
|
|
* @param array $classes
|
|
* @return string
|
|
*/
|
|
protected function doExtraAttributes($tag_name, $attr, $defaultIdValue = null, $classes = array()) {
|
|
if (empty($attr) && !$defaultIdValue && empty($classes)) return "";
|
|
|
|
// Split on components
|
|
preg_match_all('/[#.a-z][-_:a-zA-Z0-9=]+/', $attr, $matches);
|
|
$elements = $matches[0];
|
|
|
|
// Handle classes and IDs (only first ID taken into account)
|
|
$attributes = array();
|
|
$id = false;
|
|
foreach ($elements as $element) {
|
|
if ($element{0} == '.') {
|
|
$classes[] = substr($element, 1);
|
|
} else if ($element{0} == '#') {
|
|
if ($id === false) $id = substr($element, 1);
|
|
} else if (strpos($element, '=') > 0) {
|
|
$parts = explode('=', $element, 2);
|
|
$attributes[] = $parts[0] . '="' . $parts[1] . '"';
|
|
}
|
|
}
|
|
|
|
if (!$id) $id = $defaultIdValue;
|
|
|
|
// Compose attributes as string
|
|
$attr_str = "";
|
|
if (!empty($id)) {
|
|
$attr_str .= ' id="'.$this->encodeAttribute($id) .'"';
|
|
}
|
|
if (!empty($classes)) {
|
|
$attr_str .= ' class="'. implode(" ", $classes) . '"';
|
|
}
|
|
if (!$this->no_markup && !empty($attributes)) {
|
|
$attr_str .= ' '.implode(" ", $attributes);
|
|
}
|
|
return $attr_str;
|
|
}
|
|
|
|
/**
|
|
* Strips link definitions from text, stores the URLs and titles in
|
|
* hash references.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function stripLinkDefinitions($text) {
|
|
$less_than_tab = $this->tab_width - 1;
|
|
|
|
// Link defs are in the form: ^[id]: url "optional title"
|
|
$text = preg_replace_callback('{
|
|
^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?: # id = $1
|
|
[ ]*
|
|
\n? # maybe *one* newline
|
|
[ ]*
|
|
(?:
|
|
<(.+?)> # url = $2
|
|
|
|
|
(\S+?) # url = $3
|
|
)
|
|
[ ]*
|
|
\n? # maybe one newline
|
|
[ ]*
|
|
(?:
|
|
(?<=\s) # lookbehind for whitespace
|
|
["(]
|
|
(.*?) # title = $4
|
|
[")]
|
|
[ ]*
|
|
)? # title is optional
|
|
(?:[ ]* '.$this->id_class_attr_catch_re.' )? # $5 = extra id & class attr
|
|
(?:\n+|\Z)
|
|
}xm',
|
|
array($this, '_stripLinkDefinitions_callback'),
|
|
$text);
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Strip link definition callback
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _stripLinkDefinitions_callback($matches) {
|
|
$link_id = strtolower($matches[1]);
|
|
$url = $matches[2] == '' ? $matches[3] : $matches[2];
|
|
$this->urls[$link_id] = $url;
|
|
$this->titles[$link_id] =& $matches[4];
|
|
$this->ref_attr[$link_id] = $this->doExtraAttributes("", $dummy =& $matches[5]);
|
|
return ''; // String that will replace the block
|
|
}
|
|
|
|
|
|
/**
|
|
* HTML block parser
|
|
*/
|
|
|
|
/**
|
|
* Tags that are always treated as block tags
|
|
* @var string
|
|
*/
|
|
protected $block_tags_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend|article|section|nav|aside|hgroup|header|footer|figcaption|figure';
|
|
|
|
/**
|
|
* Tags treated as block tags only if the opening tag is alone on its line
|
|
* @var string
|
|
*/
|
|
protected $context_block_tags_re = 'script|noscript|style|ins|del|iframe|object|source|track|param|math|svg|canvas|audio|video';
|
|
|
|
/**
|
|
* Tags where markdown="1" default to span mode:
|
|
* @var string
|
|
*/
|
|
protected $contain_span_tags_re = 'p|h[1-6]|li|dd|dt|td|th|legend|address';
|
|
|
|
/**
|
|
* Tags which must not have their contents modified, no matter where
|
|
* they appear
|
|
* @var string
|
|
*/
|
|
protected $clean_tags_re = 'script|style|math|svg';
|
|
|
|
/**
|
|
* Tags that do not need to be closed.
|
|
* @var string
|
|
*/
|
|
protected $auto_close_tags_re = 'hr|img|param|source|track';
|
|
|
|
/**
|
|
* Hashify HTML Blocks and "clean tags".
|
|
*
|
|
* We only want to do this for block-level HTML tags, such as headers,
|
|
* lists, and tables. That's because we still want to wrap <p>s around
|
|
* "paragraphs" that are wrapped in non-block-level tags, such as anchors,
|
|
* phrase emphasis, and spans. The list of tags we're looking for is
|
|
* hard-coded.
|
|
*
|
|
* This works by calling _HashHTMLBlocks_InMarkdown, which then calls
|
|
* _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1"
|
|
* attribute is found within a tag, _HashHTMLBlocks_InHTML calls back
|
|
* _HashHTMLBlocks_InMarkdown to handle the Markdown syntax within the tag.
|
|
* These two functions are calling each other. It's recursive!
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function hashHTMLBlocks($text) {
|
|
if ($this->no_markup) {
|
|
return $text;
|
|
}
|
|
|
|
// Call the HTML-in-Markdown hasher.
|
|
list($text, ) = $this->_hashHTMLBlocks_inMarkdown($text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Parse markdown text, calling _HashHTMLBlocks_InHTML for block tags.
|
|
*
|
|
* * $indent is the number of space to be ignored when checking for code
|
|
* blocks. This is important because if we don't take the indent into
|
|
* account, something like this (which looks right) won't work as expected:
|
|
*
|
|
* <div>
|
|
* <div markdown="1">
|
|
* Hello World. <-- Is this a Markdown code block or text?
|
|
* </div> <-- Is this a Markdown code block or a real tag?
|
|
* <div>
|
|
*
|
|
* If you don't like this, just don't indent the tag on which
|
|
* you apply the markdown="1" attribute.
|
|
*
|
|
* * If $enclosing_tag_re is not empty, stops at the first unmatched closing
|
|
* tag with that name. Nested tags supported.
|
|
*
|
|
* * If $span is true, text inside must treated as span. So any double
|
|
* newline will be replaced by a single newline so that it does not create
|
|
* paragraphs.
|
|
*
|
|
* Returns an array of that form: ( processed text , remaining text )
|
|
*
|
|
* @param string $text
|
|
* @param integer $indent
|
|
* @param string $enclosing_tag_re
|
|
* @param boolean $span
|
|
* @return array
|
|
*/
|
|
protected function _hashHTMLBlocks_inMarkdown($text, $indent = 0,
|
|
$enclosing_tag_re = '', $span = false)
|
|
{
|
|
|
|
if ($text === '') return array('', '');
|
|
|
|
// Regex to check for the presense of newlines around a block tag.
|
|
$newline_before_re = '/(?:^\n?|\n\n)*$/';
|
|
$newline_after_re =
|
|
'{
|
|
^ # Start of text following the tag.
|
|
(?>[ ]*<!--.*?-->)? # Optional comment.
|
|
[ ]*\n # Must be followed by newline.
|
|
}xs';
|
|
|
|
// Regex to match any tag.
|
|
$block_tag_re =
|
|
'{
|
|
( # $2: Capture whole tag.
|
|
</? # Any opening or closing tag.
|
|
(?> # Tag name.
|
|
' . $this->block_tags_re . ' |
|
|
' . $this->context_block_tags_re . ' |
|
|
' . $this->clean_tags_re . ' |
|
|
(?!\s)'.$enclosing_tag_re . '
|
|
)
|
|
(?:
|
|
(?=[\s"\'/a-zA-Z0-9]) # Allowed characters after tag name.
|
|
(?>
|
|
".*?" | # Double quotes (can contain `>`)
|
|
\'.*?\' | # Single quotes (can contain `>`)
|
|
.+? # Anything but quotes and `>`.
|
|
)*?
|
|
)?
|
|
> # End of tag.
|
|
|
|
|
<!-- .*? --> # HTML Comment
|
|
|
|
|
<\?.*?\?> | <%.*?%> # Processing instruction
|
|
|
|
|
<!\[CDATA\[.*?\]\]> # CData Block
|
|
' . ( !$span ? ' # If not in span.
|
|
|
|
|
# Indented code block
|
|
(?: ^[ ]*\n | ^ | \n[ ]*\n )
|
|
[ ]{' . ($indent + 4) . '}[^\n]* \n
|
|
(?>
|
|
(?: [ ]{' . ($indent + 4) . '}[^\n]* | [ ]* ) \n
|
|
)*
|
|
|
|
|
# Fenced code block marker
|
|
(?<= ^ | \n )
|
|
[ ]{0,' . ($indent + 3) . '}(?:~{3,}|`{3,})
|
|
[ ]*
|
|
(?: \.?[-_:a-zA-Z0-9]+ )? # standalone class name
|
|
[ ]*
|
|
(?: ' . $this->id_class_attr_nocatch_re . ' )? # extra attributes
|
|
[ ]*
|
|
(?= \n )
|
|
' : '' ) . ' # End (if not is span).
|
|
|
|
|
# Code span marker
|
|
# Note, this regex needs to go after backtick fenced
|
|
# code blocks but it should also be kept outside of the
|
|
# "if not in span" condition adding backticks to the parser
|
|
`+
|
|
)
|
|
}xs';
|
|
|
|
|
|
$depth = 0; // Current depth inside the tag tree.
|
|
$parsed = ""; // Parsed text that will be returned.
|
|
|
|
// Loop through every tag until we find the closing tag of the parent
|
|
// or loop until reaching the end of text if no parent tag specified.
|
|
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.
|
|
$parts = preg_split($block_tag_re, $text, 2,
|
|
PREG_SPLIT_DELIM_CAPTURE);
|
|
|
|
// If in Markdown span mode, add a empty-string span-level hash
|
|
// after each newline to prevent triggering any block element.
|
|
if ($span) {
|
|
$void = $this->hashPart("", ':');
|
|
$newline = "\n$void";
|
|
$parts[0] = $void . str_replace("\n", $newline, $parts[0]) . $void;
|
|
}
|
|
|
|
$parsed .= $parts[0]; // Text before current tag.
|
|
|
|
// If end of $text has been reached. Stop loop.
|
|
if (count($parts) < 3) {
|
|
$text = "";
|
|
break;
|
|
}
|
|
|
|
$tag = $parts[1]; // Tag to handle.
|
|
$text = $parts[2]; // Remaining text after current tag.
|
|
$tag_re = preg_quote($tag); // For use in a regular expression.
|
|
|
|
// Check for: Fenced code block marker.
|
|
// Note: need to recheck the whole tag to disambiguate backtick
|
|
// fences from code spans
|
|
if (preg_match('{^\n?([ ]{0,' . ($indent + 3) . '})(~{3,}|`{3,})[ ]*(?:\.?[-_:a-zA-Z0-9]+)?[ ]*(?:' . $this->id_class_attr_nocatch_re . ')?[ ]*\n?$}', $tag, $capture)) {
|
|
// Fenced code block marker: find matching end marker.
|
|
$fence_indent = strlen($capture[1]); // use captured indent in re
|
|
$fence_re = $capture[2]; // use captured fence in re
|
|
if (preg_match('{^(?>.*\n)*?[ ]{' . ($fence_indent) . '}' . $fence_re . '[ ]*(?:\n|$)}', $text,
|
|
$matches))
|
|
{
|
|
// End marker found: pass text unchanged until marker.
|
|
$parsed .= $tag . $matches[0];
|
|
$text = substr($text, strlen($matches[0]));
|
|
}
|
|
else {
|
|
// No end marker: just skip it.
|
|
$parsed .= $tag;
|
|
}
|
|
}
|
|
// Check for: Indented code block.
|
|
else if ($tag{0} == "\n" || $tag{0} == " ") {
|
|
// Indented code block: pass it unchanged, will be handled
|
|
// later.
|
|
$parsed .= $tag;
|
|
}
|
|
// Check for: Code span marker
|
|
// Note: need to check this after backtick fenced code blocks
|
|
else if ($tag{0} == "`") {
|
|
// Find corresponding end marker.
|
|
$tag_re = preg_quote($tag);
|
|
if (preg_match('{^(?>.+?|\n(?!\n))*?(?<!`)' . $tag_re . '(?!`)}',
|
|
$text, $matches))
|
|
{
|
|
// End marker found: pass text unchanged until marker.
|
|
$parsed .= $tag . $matches[0];
|
|
$text = substr($text, strlen($matches[0]));
|
|
}
|
|
else {
|
|
// Unmatched marker: just skip it.
|
|
$parsed .= $tag;
|
|
}
|
|
}
|
|
// Check for: Opening Block level tag or
|
|
// Opening Context Block tag (like ins and del)
|
|
// used as a block tag (tag is alone on it's line).
|
|
else if (preg_match('{^<(?:' . $this->block_tags_re . ')\b}', $tag) ||
|
|
( preg_match('{^<(?:' . $this->context_block_tags_re . ')\b}', $tag) &&
|
|
preg_match($newline_before_re, $parsed) &&
|
|
preg_match($newline_after_re, $text) )
|
|
)
|
|
{
|
|
// Need to parse tag and following text using the HTML parser.
|
|
list($block_text, $text) =
|
|
$this->_hashHTMLBlocks_inHTML($tag . $text, "hashBlock", true);
|
|
|
|
// Make sure it stays outside of any paragraph by adding newlines.
|
|
$parsed .= "\n\n$block_text\n\n";
|
|
}
|
|
// Check for: Clean tag (like script, math)
|
|
// HTML Comments, processing instructions.
|
|
else if (preg_match('{^<(?:' . $this->clean_tags_re . ')\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) =
|
|
$this->_hashHTMLBlocks_inHTML($tag . $text, "hashClean", false);
|
|
|
|
$parsed .= $block_text;
|
|
}
|
|
// Check for: Tag with same name as enclosing tag.
|
|
else if ($enclosing_tag_re !== '' &&
|
|
// Same name as enclosing tag.
|
|
preg_match('{^</?(?:' . $enclosing_tag_re . ')\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);
|
|
}
|
|
|
|
/**
|
|
* Parse HTML, calling _HashHTMLBlocks_InMarkdown for block tags.
|
|
*
|
|
* * Calls $hash_method 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 )
|
|
* @param string $text
|
|
* @param string $hash_method
|
|
* @param string $md_attr
|
|
* @return array
|
|
*/
|
|
protected function _hashHTMLBlocks_inHTML($text, $hash_method, $md_attr) {
|
|
if ($text === '') return array('', '');
|
|
|
|
// Regex to match `markdown` attribute inside of a tag.
|
|
$markdown_attr_re = '
|
|
{
|
|
\s* # Eat whitespace before the `markdown` attribute
|
|
markdown
|
|
\s*=\s*
|
|
(?>
|
|
(["\']) # $1: quote delimiter
|
|
(.*?) # $2: attribute value
|
|
\1 # matching delimiter
|
|
|
|
|
([^\s>]*) # $3: unquoted attribute value
|
|
)
|
|
() # $4: make $3 always defined (avoid warnings)
|
|
}xs';
|
|
|
|
// Regex to match any tag.
|
|
$tag_re = '{
|
|
( # $2: Capture whole tag.
|
|
</? # Any opening or closing tag.
|
|
[\w:$]+ # Tag name.
|
|
(?:
|
|
(?=[\s"\'/a-zA-Z0-9]) # Allowed characters after tag name.
|
|
(?>
|
|
".*?" | # Double quotes (can contain `>`)
|
|
\'.*?\' | # Single quotes (can contain `>`)
|
|
.+? # Anything but quotes and `>`.
|
|
)*?
|
|
)?
|
|
> # End of tag.
|
|
|
|
|
<!-- .*? --> # HTML Comment
|
|
|
|
|
<\?.*?\?> | <%.*?%> # Processing instruction
|
|
|
|
|
<!\[CDATA\[.*?\]\]> # CData Block
|
|
)
|
|
}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.
|
|
// (This pattern makes $base_tag_name_re safe without quoting.)
|
|
if (preg_match('/^<([\w:$]*)\b/', $text, $matches))
|
|
$base_tag_name_re = $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_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
|
|
|
|
if (count($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('{^</?(?:' . $this->auto_close_tags_re . ')\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_re . '\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_re, $tag, $attr_m) &&
|
|
preg_match('/^1|block|span$/', $attr_m[2] . $attr_m[3]))
|
|
{
|
|
// Remove `markdown` attribute from opening tag.
|
|
$tag = preg_replace($markdown_attr_re, '', $tag);
|
|
|
|
// Check if text inside this tag must be parsed in span mode.
|
|
$this->mode = $attr_m[2] . $attr_m[3];
|
|
$span_mode = $this->mode == 'span' || $this->mode != 'block' &&
|
|
preg_match('{^<(?:' . $this->contain_span_tags_re . ')\b}', $tag);
|
|
|
|
// Calculate indent before tag.
|
|
if (preg_match('/(?:^|\n)( *?)(?! ).*?$/', $block_text, $matches)) {
|
|
$strlen = $this->utf8_strlen;
|
|
$indent = $strlen($matches[1], 'UTF-8');
|
|
} else {
|
|
$indent = 0;
|
|
}
|
|
|
|
// End preceding block with this tag.
|
|
$block_text .= $tag;
|
|
$parsed .= $this->$hash_method($block_text);
|
|
|
|
// Get enclosing tag name for the ParseMarkdown function.
|
|
// (This pattern makes $tag_name_re safe without quoting.)
|
|
preg_match('/^<([\w:$]*)\b/', $tag, $matches);
|
|
$tag_name_re = $matches[1];
|
|
|
|
// Parse the content using the HTML-in-Markdown parser.
|
|
list ($block_text, $text)
|
|
= $this->_hashHTMLBlocks_inMarkdown($text, $indent,
|
|
$tag_name_re, $span_mode);
|
|
|
|
// Outdent markdown text.
|
|
if ($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 with a new block.
|
|
$block_text = "";
|
|
}
|
|
else $block_text .= $tag;
|
|
}
|
|
|
|
} while ($depth > 0);
|
|
|
|
// Hash last block text that wasn't processed inside the loop.
|
|
$parsed .= $this->$hash_method($block_text);
|
|
|
|
return array($parsed, $text);
|
|
}
|
|
|
|
/**
|
|
* Called whenever a tag must be hashed when a function inserts a "clean" tag
|
|
* in $text, it passes through this function and is automaticaly escaped,
|
|
* blocking invalid nested overlap.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function hashClean($text) {
|
|
return $this->hashPart($text, 'C');
|
|
}
|
|
|
|
/**
|
|
* Turn Markdown link shortcuts into XHTML <a> tags.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doAnchors($text) {
|
|
if ($this->in_anchor) {
|
|
return $text;
|
|
}
|
|
$this->in_anchor = true;
|
|
|
|
// First, handle reference-style links: [link text] [id]
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
\[
|
|
(' . $this->nested_brackets_re . ') # link text = $2
|
|
\]
|
|
|
|
[ ]? # one optional space
|
|
(?:\n[ ]*)? # one optional newline followed by spaces
|
|
|
|
\[
|
|
(.*?) # id = $3
|
|
\]
|
|
)
|
|
}xs',
|
|
array($this, '_doAnchors_reference_callback'), $text);
|
|
|
|
// Next, inline-style links: [link text](url "optional title")
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
\[
|
|
(' . $this->nested_brackets_re . ') # link text = $2
|
|
\]
|
|
\( # literal paren
|
|
[ \n]*
|
|
(?:
|
|
<(.+?)> # href = $3
|
|
|
|
|
(' . $this->nested_url_parenthesis_re . ') # href = $4
|
|
)
|
|
[ \n]*
|
|
( # $5
|
|
([\'"]) # quote char = $6
|
|
(.*?) # Title = $7
|
|
\6 # matching quote
|
|
[ \n]* # ignore any spaces/tabs between closing quote and )
|
|
)? # title is optional
|
|
\)
|
|
(?:[ ]? ' . $this->id_class_attr_catch_re . ' )? # $8 = id/class attributes
|
|
)
|
|
}xs',
|
|
array($this, '_doAnchors_inline_callback'), $text);
|
|
|
|
// Last, handle reference-style shortcuts: [link text]
|
|
// These must come last in case you've also got [link text][1]
|
|
// or [link text](/foo)
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
\[
|
|
([^\[\]]+) # link text = $2; can\'t contain [ or ]
|
|
\]
|
|
)
|
|
}xs',
|
|
array($this, '_doAnchors_reference_callback'), $text);
|
|
|
|
$this->in_anchor = false;
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Callback for reference anchors
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doAnchors_reference_callback($matches) {
|
|
$whole_match = $matches[1];
|
|
$link_text = $matches[2];
|
|
$link_id =& $matches[3];
|
|
|
|
if ($link_id == "") {
|
|
// for shortcut links like [this][] or [this].
|
|
$link_id = $link_text;
|
|
}
|
|
|
|
// lower-case and turn embedded newlines into spaces
|
|
$link_id = strtolower($link_id);
|
|
$link_id = preg_replace('{[ ]?\n}', ' ', $link_id);
|
|
|
|
if (isset($this->urls[$link_id])) {
|
|
$url = $this->urls[$link_id];
|
|
$url = $this->encodeURLAttribute($url);
|
|
|
|
$result = "<a href=\"$url\"";
|
|
if ( isset( $this->titles[$link_id] ) ) {
|
|
$title = $this->titles[$link_id];
|
|
$title = $this->encodeAttribute($title);
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
if (isset($this->ref_attr[$link_id]))
|
|
$result .= $this->ref_attr[$link_id];
|
|
|
|
$link_text = $this->runSpanGamut($link_text);
|
|
$result .= ">$link_text</a>";
|
|
$result = $this->hashPart($result);
|
|
}
|
|
else {
|
|
$result = $whole_match;
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Callback for inline anchors
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doAnchors_inline_callback($matches) {
|
|
$whole_match = $matches[1];
|
|
$link_text = $this->runSpanGamut($matches[2]);
|
|
$url = $matches[3] == '' ? $matches[4] : $matches[3];
|
|
$title =& $matches[7];
|
|
$attr = $this->doExtraAttributes("a", $dummy =& $matches[8]);
|
|
|
|
// if the URL was of the form <s p a c e s> it got caught by the HTML
|
|
// tag parser and hashed. Need to reverse the process before using the URL.
|
|
$unhashed = $this->unhash($url);
|
|
if ($unhashed != $url)
|
|
$url = preg_replace('/^<(.*)>$/', '\1', $unhashed);
|
|
|
|
$url = $this->encodeURLAttribute($url);
|
|
|
|
$result = "<a href=\"$url\"";
|
|
if (isset($title)) {
|
|
$title = $this->encodeAttribute($title);
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
$result .= $attr;
|
|
|
|
$link_text = $this->runSpanGamut($link_text);
|
|
$result .= ">$link_text</a>";
|
|
|
|
return $this->hashPart($result);
|
|
}
|
|
|
|
/**
|
|
* Turn Markdown image shortcuts into <img> tags.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doImages($text) {
|
|
// First, handle reference-style labeled images: ![alt text][id]
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
!\[
|
|
(' . $this->nested_brackets_re . ') # alt text = $2
|
|
\]
|
|
|
|
[ ]? # one optional space
|
|
(?:\n[ ]*)? # one optional newline followed by spaces
|
|
|
|
\[
|
|
(.*?) # id = $3
|
|
\]
|
|
|
|
)
|
|
}xs',
|
|
array($this, '_doImages_reference_callback'), $text);
|
|
|
|
// Next, handle inline images: ![alt text](url "optional title")
|
|
// Don't forget: encode * and _
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
!\[
|
|
(' . $this->nested_brackets_re . ') # alt text = $2
|
|
\]
|
|
\s? # One optional whitespace character
|
|
\( # literal paren
|
|
[ \n]*
|
|
(?:
|
|
<(\S*)> # src url = $3
|
|
|
|
|
(' . $this->nested_url_parenthesis_re . ') # src url = $4
|
|
)
|
|
[ \n]*
|
|
( # $5
|
|
([\'"]) # quote char = $6
|
|
(.*?) # title = $7
|
|
\6 # matching quote
|
|
[ \n]*
|
|
)? # title is optional
|
|
\)
|
|
(?:[ ]? ' . $this->id_class_attr_catch_re . ' )? # $8 = id/class attributes
|
|
)
|
|
}xs',
|
|
array($this, '_doImages_inline_callback'), $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Callback for referenced images
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doImages_reference_callback($matches) {
|
|
$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 = $this->encodeAttribute($alt_text);
|
|
if (isset($this->urls[$link_id])) {
|
|
$url = $this->encodeURLAttribute($this->urls[$link_id]);
|
|
$result = "<img src=\"$url\" alt=\"$alt_text\"";
|
|
if (isset($this->titles[$link_id])) {
|
|
$title = $this->titles[$link_id];
|
|
$title = $this->encodeAttribute($title);
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
if (isset($this->ref_attr[$link_id]))
|
|
$result .= $this->ref_attr[$link_id];
|
|
$result .= $this->empty_element_suffix;
|
|
$result = $this->hashPart($result);
|
|
}
|
|
else {
|
|
// If there's no such link ID, leave intact:
|
|
$result = $whole_match;
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Callback for inline images
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doImages_inline_callback($matches) {
|
|
$whole_match = $matches[1];
|
|
$alt_text = $matches[2];
|
|
$url = $matches[3] == '' ? $matches[4] : $matches[3];
|
|
$title =& $matches[7];
|
|
$attr = $this->doExtraAttributes("img", $dummy =& $matches[8]);
|
|
|
|
$alt_text = $this->encodeAttribute($alt_text);
|
|
$url = $this->encodeURLAttribute($url);
|
|
$result = "<img src=\"$url\" alt=\"$alt_text\"";
|
|
if (isset($title)) {
|
|
$title = $this->encodeAttribute($title);
|
|
$result .= " title=\"$title\""; // $title already quoted
|
|
}
|
|
$result .= $attr;
|
|
$result .= $this->empty_element_suffix;
|
|
|
|
return $this->hashPart($result);
|
|
}
|
|
|
|
/**
|
|
* Process markdown headers. Redefined to add ID and class attribute support.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doHeaders($text) {
|
|
// Setext-style headers:
|
|
// Header 1 {#header1}
|
|
// ========
|
|
//
|
|
// Header 2 {#header2 .class1 .class2}
|
|
// --------
|
|
//
|
|
$text = preg_replace_callback(
|
|
'{
|
|
(^.+?) # $1: Header text
|
|
(?:[ ]+ ' . $this->id_class_attr_catch_re . ' )? # $3 = id/class attributes
|
|
[ ]*\n(=+|-+)[ ]*\n+ # $3: Header footer
|
|
}mx',
|
|
array($this, '_doHeaders_callback_setext'), $text);
|
|
|
|
// atx-style headers:
|
|
// # Header 1 {#header1}
|
|
// ## Header 2 {#header2}
|
|
// ## Header 2 with closing hashes ## {#header3.class1.class2}
|
|
// ...
|
|
// ###### Header 6 {.class2}
|
|
//
|
|
$text = preg_replace_callback('{
|
|
^(\#{1,6}) # $1 = string of #\'s
|
|
[ ]'.($this->hashtag_protection ? '+' : '*').'
|
|
(.+?) # $2 = Header text
|
|
[ ]*
|
|
\#* # optional closing #\'s (not counted)
|
|
(?:[ ]+ ' . $this->id_class_attr_catch_re . ' )? # $3 = id/class attributes
|
|
[ ]*
|
|
\n+
|
|
}xm',
|
|
array($this, '_doHeaders_callback_atx'), $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Callback for setext headers
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doHeaders_callback_setext($matches) {
|
|
if ($matches[3] == '-' && preg_match('{^- }', $matches[1])) {
|
|
return $matches[0];
|
|
}
|
|
|
|
$level = $matches[3]{0} == '=' ? 1 : 2;
|
|
|
|
$defaultId = is_callable($this->header_id_func) ? call_user_func($this->header_id_func, $matches[1]) : null;
|
|
|
|
$attr = $this->doExtraAttributes("h$level", $dummy =& $matches[2], $defaultId);
|
|
$block = "<h$level$attr>" . $this->runSpanGamut($matches[1]) . "</h$level>";
|
|
return "\n" . $this->hashBlock($block) . "\n\n";
|
|
}
|
|
|
|
/**
|
|
* Callback for atx headers
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doHeaders_callback_atx($matches) {
|
|
$level = strlen($matches[1]);
|
|
|
|
$defaultId = is_callable($this->header_id_func) ? call_user_func($this->header_id_func, $matches[2]) : null;
|
|
$attr = $this->doExtraAttributes("h$level", $dummy =& $matches[3], $defaultId);
|
|
$block = "<h$level$attr>" . $this->runSpanGamut($matches[2]) . "</h$level>";
|
|
return "\n" . $this->hashBlock($block) . "\n\n";
|
|
}
|
|
|
|
/**
|
|
* Form HTML tables.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doTables($text) {
|
|
$less_than_tab = $this->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
|
|
|
|
( # $3: Cells
|
|
(?>
|
|
[ ]* # Allowed whitespace.
|
|
[|] .* \n # Row content.
|
|
)*
|
|
)
|
|
(?=\n|\Z) # Stop at final double newline.
|
|
}xm',
|
|
array($this, '_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
|
|
|
|
( # $3: Cells
|
|
(?>
|
|
.* [|] .* \n # Row content
|
|
)*
|
|
)
|
|
(?=\n|\Z) # Stop at final double newline.
|
|
}xm',
|
|
array($this, '_DoTable_callback'), $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Callback for removing the leading pipe for each row
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doTable_leadingPipe_callback($matches) {
|
|
$head = $matches[1];
|
|
$underline = $matches[2];
|
|
$content = $matches[3];
|
|
|
|
$content = preg_replace('/^ *[|]/m', '', $content);
|
|
|
|
return $this->_doTable_callback(array($matches[0], $head, $underline, $content));
|
|
}
|
|
|
|
/**
|
|
* Make the align attribute in a table
|
|
* @param string $alignname
|
|
* @return string
|
|
*/
|
|
protected function _doTable_makeAlignAttr($alignname)
|
|
{
|
|
if (empty($this->table_align_class_tmpl)) {
|
|
return " align=\"$alignname\"";
|
|
}
|
|
|
|
$classname = str_replace('%%', $alignname, $this->table_align_class_tmpl);
|
|
return " class=\"$classname\"";
|
|
}
|
|
|
|
/**
|
|
* Calback for processing tables
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doTable_callback($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] = $this->_doTable_makeAlignAttr('right');
|
|
else if (preg_match('/^ *:-+: *$/', $s))
|
|
$attr[$n] = $this->_doTable_makeAlignAttr('center');
|
|
else if (preg_match('/^ *:-+ *$/', $s))
|
|
$attr[$n] = $this->_doTable_makeAlignAttr('left');
|
|
else
|
|
$attr[$n] = '';
|
|
}
|
|
|
|
// Parsing span elements, including code spans, character escapes,
|
|
// and inline HTML tags, so that pipes inside those gets ignored.
|
|
$head = $this->parseSpan($head);
|
|
$headers = preg_split('/ *[|] */', $head);
|
|
$col_count = count($headers);
|
|
$attr = array_pad($attr, $col_count, '');
|
|
|
|
// Write column headers.
|
|
$text = "<table>\n";
|
|
$text .= "<thead>\n";
|
|
$text .= "<tr>\n";
|
|
foreach ($headers as $n => $header)
|
|
$text .= " <th$attr[$n]>" . $this->runSpanGamut(trim($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) {
|
|
// Parsing span elements, including code spans, character escapes,
|
|
// and inline HTML tags, so that pipes inside those gets ignored.
|
|
$row = $this->parseSpan($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]>" . $this->runSpanGamut(trim($cell)) . "</td>\n";
|
|
$text .= "</tr>\n";
|
|
}
|
|
$text .= "</tbody>\n";
|
|
$text .= "</table>";
|
|
|
|
return $this->hashBlock($text) . "\n";
|
|
}
|
|
|
|
/**
|
|
* Form HTML definition lists.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doDefLists($text) {
|
|
$less_than_tab = $this->tab_width - 1;
|
|
|
|
// Re-usable pattern to match any entire dl list:
|
|
$whole_list_re = '(?>
|
|
( # $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('{
|
|
(?>\A\n?|(?<=\n\n))
|
|
' . $whole_list_re . '
|
|
}mx',
|
|
array($this, '_doDefLists_callback'), $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Callback for processing definition lists
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doDefLists_callback($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:
|
|
$result = trim($this->processDefListItems($list));
|
|
$result = "<dl>\n" . $result . "\n</dl>";
|
|
return $this->hashBlock($result) . "\n\n";
|
|
}
|
|
|
|
/**
|
|
* Process the contents of a single definition list, splitting it
|
|
* into individual term and definition list items.
|
|
* @param string $list_str
|
|
* @return string
|
|
*/
|
|
protected function processDefListItems($list_str) {
|
|
|
|
$less_than_tab = $this->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('{
|
|
(?>\A\n?|\n\n+) # leading line
|
|
( # definition terms = $1
|
|
[ ]{0,' . $less_than_tab . '} # leading whitespace
|
|
(?!\:[ ]|[ ]) # negative lookahead for a definition
|
|
# mark (colon) or more whitespace.
|
|
(?> \S.* \n)+? # actual term (not whitespace).
|
|
)
|
|
(?=\n?[ ]{0,3}:[ ]) # lookahead for following line feed
|
|
# with a definition mark.
|
|
}xm',
|
|
array($this, '_processDefListItems_callback_dt'), $list_str);
|
|
|
|
// Process actual definitions.
|
|
$list_str = preg_replace_callback('{
|
|
\n(\n+)? # leading line = $1
|
|
( # marker space = $2
|
|
[ ]{0,' . $less_than_tab . '} # whitespace before colon
|
|
\:[ ]+ # definition mark (colon)
|
|
)
|
|
((?s:.+?)) # definition text = $3
|
|
(?= \n+ # stop at next definition mark,
|
|
(?: # next term or end of text
|
|
[ ]{0,' . $less_than_tab . '} \:[ ] |
|
|
<dt> | \z
|
|
)
|
|
)
|
|
}xm',
|
|
array($this, '_processDefListItems_callback_dd'), $list_str);
|
|
|
|
return $list_str;
|
|
}
|
|
|
|
/**
|
|
* Callback for <dt> elements in definition lists
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _processDefListItems_callback_dt($matches) {
|
|
$terms = explode("\n", trim($matches[1]));
|
|
$text = '';
|
|
foreach ($terms as $term) {
|
|
$term = $this->runSpanGamut(trim($term));
|
|
$text .= "\n<dt>" . $term . "</dt>";
|
|
}
|
|
return $text . "\n";
|
|
}
|
|
|
|
/**
|
|
* Callback for <dd> elements in definition lists
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _processDefListItems_callback_dd($matches) {
|
|
$leading_line = $matches[1];
|
|
$marker_space = $matches[2];
|
|
$def = $matches[3];
|
|
|
|
if ($leading_line || preg_match('/\n{2,}/', $def)) {
|
|
// Replace marker with the appropriate whitespace indentation
|
|
$def = str_repeat(' ', strlen($marker_space)) . $def;
|
|
$def = $this->runBlockGamut($this->outdent($def . "\n\n"));
|
|
$def = "\n". $def ."\n";
|
|
}
|
|
else {
|
|
$def = rtrim($def);
|
|
$def = $this->runSpanGamut($this->outdent($def));
|
|
}
|
|
|
|
return "\n<dd>" . $def . "</dd>\n";
|
|
}
|
|
|
|
/**
|
|
* Adding the fenced code block syntax to regular Markdown:
|
|
*
|
|
* ~~~
|
|
* Code block
|
|
* ~~~
|
|
*
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doFencedCodeBlocks($text) {
|
|
|
|
$less_than_tab = $this->tab_width;
|
|
|
|
$text = preg_replace_callback('{
|
|
(?:\n|\A)
|
|
# 1: Opening marker
|
|
(
|
|
(?:~{3,}|`{3,}) # 3 or more tildes/backticks.
|
|
)
|
|
[ ]*
|
|
(?:
|
|
\.?([-_:a-zA-Z0-9]+) # 2: standalone class name
|
|
)?
|
|
[ ]*
|
|
(?:
|
|
' . $this->id_class_attr_catch_re . ' # 3: Extra attributes
|
|
)?
|
|
[ ]* \n # Whitespace and newline following marker.
|
|
|
|
# 4: Content
|
|
(
|
|
(?>
|
|
(?!\1 [ ]* \n) # Not a closing marker.
|
|
.*\n+
|
|
)+
|
|
)
|
|
|
|
# Closing marker.
|
|
\1 [ ]* (?= \n )
|
|
}xm',
|
|
array($this, '_doFencedCodeBlocks_callback'), $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Callback to process fenced code blocks
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doFencedCodeBlocks_callback($matches) {
|
|
$classname =& $matches[2];
|
|
$attrs =& $matches[3];
|
|
$codeblock = $matches[4];
|
|
|
|
if ($this->code_block_content_func) {
|
|
$codeblock = call_user_func($this->code_block_content_func, $codeblock, $classname);
|
|
} else {
|
|
$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
|
|
}
|
|
|
|
$codeblock = preg_replace_callback('/^\n+/',
|
|
array($this, '_doFencedCodeBlocks_newlines'), $codeblock);
|
|
|
|
$classes = array();
|
|
if ($classname != "") {
|
|
if ($classname{0} == '.')
|
|
$classname = substr($classname, 1);
|
|
$classes[] = $this->code_class_prefix . $classname;
|
|
}
|
|
$attr_str = $this->doExtraAttributes($this->code_attr_on_pre ? "pre" : "code", $attrs, null, $classes);
|
|
$pre_attr_str = $this->code_attr_on_pre ? $attr_str : '';
|
|
$code_attr_str = $this->code_attr_on_pre ? '' : $attr_str;
|
|
$codeblock = "<pre$pre_attr_str><code$code_attr_str>$codeblock</code></pre>";
|
|
|
|
return "\n\n".$this->hashBlock($codeblock)."\n\n";
|
|
}
|
|
|
|
/**
|
|
* Replace new lines in fenced code blocks
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doFencedCodeBlocks_newlines($matches) {
|
|
return str_repeat("<br$this->empty_element_suffix",
|
|
strlen($matches[0]));
|
|
}
|
|
|
|
/**
|
|
* Redefining emphasis markers so that emphasis by underscore does not
|
|
* work in the middle of a word.
|
|
* @var array
|
|
*/
|
|
protected $em_relist = array(
|
|
'' => '(?:(?<!\*)\*(?!\*)|(?<![a-zA-Z0-9_])_(?!_))(?![\.,:;]?\s)',
|
|
'*' => '(?<![\s*])\*(?!\*)',
|
|
'_' => '(?<![\s_])_(?![a-zA-Z0-9_])',
|
|
);
|
|
protected $strong_relist = array(
|
|
'' => '(?:(?<!\*)\*\*(?!\*)|(?<![a-zA-Z0-9_])__(?!_))(?![\.,:;]?\s)',
|
|
'**' => '(?<![\s*])\*\*(?!\*)',
|
|
'__' => '(?<![\s_])__(?![a-zA-Z0-9_])',
|
|
);
|
|
protected $em_strong_relist = array(
|
|
'' => '(?:(?<!\*)\*\*\*(?!\*)|(?<![a-zA-Z0-9_])___(?!_))(?![\.,:;]?\s)',
|
|
'***' => '(?<![\s*])\*\*\*(?!\*)',
|
|
'___' => '(?<![\s_])___(?![a-zA-Z0-9_])',
|
|
);
|
|
|
|
/**
|
|
* Parse text into paragraphs
|
|
* @param string $text String to process in paragraphs
|
|
* @param boolean $wrap_in_p Whether paragraphs should be wrapped in <p> tags
|
|
* @return string HTML output
|
|
*/
|
|
protected function formParagraphs($text, $wrap_in_p = true) {
|
|
// Strip leading and trailing lines:
|
|
$text = preg_replace('/\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) {
|
|
$value = trim($this->runSpanGamut($value));
|
|
|
|
// Check if this should be enclosed in a paragraph.
|
|
// Clean tag hashes & block tag hashes are left alone.
|
|
$is_p = $wrap_in_p && !preg_match('/^B\x1A[0-9]+B|^C\x1A[0-9]+C$/', $value);
|
|
|
|
if ($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 = $this->unhash($text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
/**
|
|
* Footnotes - Strips link definitions from text, stores the URLs and
|
|
* titles in hash references.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function stripFootnotes($text) {
|
|
$less_than_tab = $this->tab_width - 1;
|
|
|
|
// Link defs are in the form: [^id]: url "optional title"
|
|
$text = preg_replace_callback('{
|
|
^[ ]{0,' . $less_than_tab . '}\[\^(.+?)\][ ]?: # note_id = $1
|
|
[ ]*
|
|
\n? # maybe *one* newline
|
|
( # text = $2 (no blank lines allowed)
|
|
(?:
|
|
.+ # actual text
|
|
|
|
|
\n # newlines but
|
|
(?!\[.+?\][ ]?:\s)# negative lookahead for footnote or link definition marker.
|
|
(?!\n+[ ]{0,3}\S)# ensure line is not blank and followed
|
|
# by non-indented content
|
|
)*
|
|
)
|
|
}xm',
|
|
array($this, '_stripFootnotes_callback'),
|
|
$text);
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Callback for stripping footnotes
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _stripFootnotes_callback($matches) {
|
|
$note_id = $this->fn_id_prefix . $matches[1];
|
|
$this->footnotes[$note_id] = $this->outdent($matches[2]);
|
|
return ''; // String that will replace the block
|
|
}
|
|
|
|
/**
|
|
* Replace footnote references in $text [^id] with a special text-token
|
|
* which will be replaced by the actual footnote marker in appendFootnotes.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doFootnotes($text) {
|
|
if (!$this->in_anchor) {
|
|
$text = preg_replace('{\[\^(.+?)\]}', "F\x1Afn:\\1\x1A:", $text);
|
|
}
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Append footnote list to text
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function appendFootnotes($text) {
|
|
$text = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}',
|
|
array($this, '_appendFootnotes_callback'), $text);
|
|
|
|
if (!empty($this->footnotes_ordered)) {
|
|
$text .= "\n\n";
|
|
$text .= "<div class=\"footnotes\" role=\"doc-endnotes\">\n";
|
|
$text .= "<hr" . $this->empty_element_suffix . "\n";
|
|
$text .= "<ol>\n\n";
|
|
|
|
$attr = "";
|
|
if ($this->fn_backlink_class != "") {
|
|
$class = $this->fn_backlink_class;
|
|
$class = $this->encodeAttribute($class);
|
|
$attr .= " class=\"$class\"";
|
|
}
|
|
if ($this->fn_backlink_title != "") {
|
|
$title = $this->fn_backlink_title;
|
|
$title = $this->encodeAttribute($title);
|
|
$attr .= " title=\"$title\"";
|
|
$attr .= " aria-label=\"$title\"";
|
|
}
|
|
$attr .= " role=\"doc-backlink\"";
|
|
$backlink_text = $this->fn_backlink_html;
|
|
$num = 0;
|
|
|
|
while (!empty($this->footnotes_ordered)) {
|
|
$footnote = reset($this->footnotes_ordered);
|
|
$note_id = key($this->footnotes_ordered);
|
|
unset($this->footnotes_ordered[$note_id]);
|
|
$ref_count = $this->footnotes_ref_count[$note_id];
|
|
unset($this->footnotes_ref_count[$note_id]);
|
|
unset($this->footnotes[$note_id]);
|
|
|
|
$footnote .= "\n"; // Need to append newline before parsing.
|
|
$footnote = $this->runBlockGamut("$footnote\n");
|
|
$footnote = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}',
|
|
array($this, '_appendFootnotes_callback'), $footnote);
|
|
|
|
$attr = str_replace("%%", ++$num, $attr);
|
|
$note_id = $this->encodeAttribute($note_id);
|
|
|
|
// Prepare backlink, multiple backlinks if multiple references
|
|
$backlink = "<a href=\"#fnref:$note_id\"$attr>$backlink_text</a>";
|
|
for ($ref_num = 2; $ref_num <= $ref_count; ++$ref_num) {
|
|
$backlink .= " <a href=\"#fnref$ref_num:$note_id\"$attr>$backlink_text</a>";
|
|
}
|
|
// Add backlink to last paragraph; create new paragraph if needed.
|
|
if (preg_match('{</p>$}', $footnote)) {
|
|
$footnote = substr($footnote, 0, -4) . " $backlink</p>";
|
|
} else {
|
|
$footnote .= "\n\n<p>$backlink</p>";
|
|
}
|
|
|
|
$text .= "<li id=\"fn:$note_id\" role=\"doc-endnote\">\n";
|
|
$text .= $footnote . "\n";
|
|
$text .= "</li>\n\n";
|
|
}
|
|
|
|
$text .= "</ol>\n";
|
|
$text .= "</div>";
|
|
}
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Callback for appending footnotes
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _appendFootnotes_callback($matches) {
|
|
$node_id = $this->fn_id_prefix . $matches[1];
|
|
|
|
// Create footnote marker only if it has a corresponding footnote *and*
|
|
// the footnote hasn't been used by another marker.
|
|
if (isset($this->footnotes[$node_id])) {
|
|
$num =& $this->footnotes_numbers[$node_id];
|
|
if (!isset($num)) {
|
|
// Transfer footnote content to the ordered list and give it its
|
|
// number
|
|
$this->footnotes_ordered[$node_id] = $this->footnotes[$node_id];
|
|
$this->footnotes_ref_count[$node_id] = 1;
|
|
$num = $this->footnote_counter++;
|
|
$ref_count_mark = '';
|
|
} else {
|
|
$ref_count_mark = $this->footnotes_ref_count[$node_id] += 1;
|
|
}
|
|
|
|
$attr = "";
|
|
if ($this->fn_link_class != "") {
|
|
$class = $this->fn_link_class;
|
|
$class = $this->encodeAttribute($class);
|
|
$attr .= " class=\"$class\"";
|
|
}
|
|
if ($this->fn_link_title != "") {
|
|
$title = $this->fn_link_title;
|
|
$title = $this->encodeAttribute($title);
|
|
$attr .= " title=\"$title\"";
|
|
}
|
|
$attr .= " role=\"doc-noteref\"";
|
|
|
|
$attr = str_replace("%%", $num, $attr);
|
|
$node_id = $this->encodeAttribute($node_id);
|
|
|
|
return
|
|
"<sup id=\"fnref$ref_count_mark:$node_id\">".
|
|
"<a href=\"#fn:$node_id\"$attr>$num</a>".
|
|
"</sup>";
|
|
}
|
|
|
|
return "[^" . $matches[1] . "]";
|
|
}
|
|
|
|
|
|
/**
|
|
* Abbreviations - strips abbreviations from text, stores titles in hash
|
|
* references.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function stripAbbreviations($text) {
|
|
$less_than_tab = $this->tab_width - 1;
|
|
|
|
// Link defs are in the form: [id]*: url "optional title"
|
|
$text = preg_replace_callback('{
|
|
^[ ]{0,' . $less_than_tab . '}\*\[(.+?)\][ ]?: # abbr_id = $1
|
|
(.*) # text = $2 (no blank lines allowed)
|
|
}xm',
|
|
array($this, '_stripAbbreviations_callback'),
|
|
$text);
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Callback for stripping abbreviations
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _stripAbbreviations_callback($matches) {
|
|
$abbr_word = $matches[1];
|
|
$abbr_desc = $matches[2];
|
|
if ($this->abbr_word_re) {
|
|
$this->abbr_word_re .= '|';
|
|
}
|
|
$this->abbr_word_re .= preg_quote($abbr_word);
|
|
$this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
|
|
return ''; // String that will replace the block
|
|
}
|
|
|
|
/**
|
|
* Find defined abbreviations in text and wrap them in <abbr> elements.
|
|
* @param string $text
|
|
* @return string
|
|
*/
|
|
protected function doAbbreviations($text) {
|
|
if ($this->abbr_word_re) {
|
|
// cannot use the /x modifier because abbr_word_re may
|
|
// contain significant spaces:
|
|
$text = preg_replace_callback('{' .
|
|
'(?<![\w\x1A])' .
|
|
'(?:' . $this->abbr_word_re . ')' .
|
|
'(?![\w\x1A])' .
|
|
'}',
|
|
array($this, '_doAbbreviations_callback'), $text);
|
|
}
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Callback for processing abbreviations
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
protected function _doAbbreviations_callback($matches) {
|
|
$abbr = $matches[0];
|
|
if (isset($this->abbr_desciptions[$abbr])) {
|
|
$desc = $this->abbr_desciptions[$abbr];
|
|
if (empty($desc)) {
|
|
return $this->hashPart("<abbr>$abbr</abbr>");
|
|
} else {
|
|
$desc = $this->encodeAttribute($desc);
|
|
return $this->hashPart("<abbr title=\"$desc\">$abbr</abbr>");
|
|
}
|
|
} else {
|
|
return $matches[0];
|
|
}
|
|
}
|
|
}
|
|
|
|
// Yellow Markdown extra extension
|
|
// Copyright (c) 2013-2019 Datenstrom
|
|
|
|
class YellowMarkdownExtraParser extends MarkdownExtraParser {
|
|
public $yellow; //access to API
|
|
public $page; //access to page
|
|
public $idAttributes; //id attributes
|
|
|
|
public function __construct($yellow, $page) {
|
|
$this->yellow = $yellow;
|
|
$this->page = $page;
|
|
$this->idAttributes = array();
|
|
$this->no_markup = $page->safeMode;
|
|
$this->url_filter_func = function($url) use ($yellow, $page) {
|
|
return $yellow->lookup->normaliseLocation($url, $page->location,
|
|
$page->safeMode && $page->statusCode==200);
|
|
};
|
|
parent::__construct();
|
|
}
|
|
|
|
// Handle links
|
|
public function doAutoLinks($text) {
|
|
$text = preg_replace_callback("/<(\w+:[^\'\">\s]+)>/", array(&$this, "_doAutoLinks_url_callback"), $text);
|
|
$text = preg_replace_callback("/<([\w\+\-\.]+@[\w\-\.]+)>/", array(&$this, "_doAutoLinks_email_callback"), $text);
|
|
$text = preg_replace_callback("/^\s*\[(\w+)(.*?)\]\s*$/", array(&$this, "_doAutoLinks_shortcutBlock_callback"), $text);
|
|
$text = preg_replace_callback("/\[(\w+)(.*?)\]/", array(&$this, "_doAutoLinks_shortcutInline_callback"), $text);
|
|
$text = preg_replace_callback("/\[\-\-(.*?)\-\-\]/", array(&$this, "_doAutoLinks_shortcutComment_callback"), $text);
|
|
$text = preg_replace_callback("/\:([\w\+\-\_]+)\:/", array(&$this, "_doAutoLinks_shortcutSymbol_callback"), $text);
|
|
$text = preg_replace_callback("/((http|https|ftp):\/\/\S+[^\'\"\,\.\;\:\s]+)/", array(&$this, "_doAutoLinks_url_callback"), $text);
|
|
$text = preg_replace_callback("/([\w\+\-\.]+@[\w\-\.]+\.[\w]{2,4})/", array(&$this, "_doAutoLinks_email_callback"), $text);
|
|
return $text;
|
|
}
|
|
|
|
// Handle shortcuts, block style
|
|
public function _doAutoLinks_shortcutBlock_callback($matches) {
|
|
$output = $this->page->parseContentShortcut($matches[1], trim($matches[2]), "block");
|
|
return is_null($output) ? $matches[0] : $this->hashBlock($output);
|
|
}
|
|
|
|
// Handle shortcuts, inline style
|
|
public function _doAutoLinks_shortcutInline_callback($matches) {
|
|
$output = $this->page->parseContentShortcut($matches[1], trim($matches[2]), "inline");
|
|
return is_null($output) ? $matches[0] : $this->hashPart($output);
|
|
}
|
|
|
|
// Handle shortcuts, comment style
|
|
public function _doAutoLinks_shortcutComment_callback($matches) {
|
|
$output = "<!--".htmlspecialchars($matches[1], ENT_NOQUOTES)."-->";
|
|
return $this->hashBlock($output);
|
|
}
|
|
|
|
// Handle shortcuts, symbol style
|
|
public function _doAutoLinks_shortcutSymbol_callback($matches) {
|
|
$output = $this->page->parseContentShortcut("", $matches[1], "symbol");
|
|
return is_null($output) ? $matches[0] : $this->hashPart($output);
|
|
}
|
|
|
|
// Handle fenced code blocks
|
|
public function _doFencedCodeBlocks_callback($matches) {
|
|
$text = $matches[4];
|
|
$name = empty($matches[2]) ? "" : "$matches[2] $matches[3]";
|
|
$output = $this->page->parseContentShortcut($name, $text, "code");
|
|
if (is_null($output)) {
|
|
$attr = $this->doExtraAttributes("pre", ".$matches[2] $matches[3]");
|
|
$output = "<pre$attr><code>".htmlspecialchars($text, ENT_NOQUOTES)."</code></pre>";
|
|
}
|
|
return "\n\n".$this->hashBlock($output)."\n\n";
|
|
}
|
|
|
|
// Handle headers, text style
|
|
public function _doHeaders_callback_setext($matches) {
|
|
if ($matches[3]=="-" && preg_match('{^- }', $matches[1])) return $matches[0];
|
|
$text = $matches[1];
|
|
$level = $matches[3]{0}=="=" ? 1 : 2;
|
|
$attr = $this->doExtraAttributes("h$level", $dummy =& $matches[2]);
|
|
if (empty($attr) && $level>=2 && $level<=3) $attr = $this->getIdAttribute($text);
|
|
$output = "<h$level$attr>".$this->runSpanGamut($text)."</h$level>";
|
|
return "\n".$this->hashBlock($output)."\n\n";
|
|
}
|
|
|
|
// Handle headers, atx style
|
|
public function _doHeaders_callback_atx($matches) {
|
|
$text = $matches[2];
|
|
$level = strlen($matches[1]);
|
|
$attr = $this->doExtraAttributes("h$level", $dummy =& $matches[3]);
|
|
if (empty($attr) && $level>=2 && $level<=3) $attr = $this->getIdAttribute($text);
|
|
$output = "<h$level$attr>".$this->runSpanGamut($text)."</h$level>";
|
|
return "\n".$this->hashBlock($output)."\n\n";
|
|
}
|
|
|
|
// Handle inline links
|
|
public function _doAnchors_inline_callback($matches) {
|
|
$url = $matches[3]=="" ? $matches[4] : $matches[3];
|
|
$text = $matches[2];
|
|
$title = $matches[7];
|
|
$attr = $this->doExtraAttributes("a", $dummy =& $matches[8]);
|
|
$output = "<a href=\"".$this->encodeURLAttribute($url)."\"";
|
|
if (!empty($title)) $output .= " title=\"".$this->encodeAttribute($title)."\"";
|
|
$output .= $attr;
|
|
$output .= ">".$this->runSpanGamut($text)."</a>";
|
|
return $this->hashPart($output);
|
|
}
|
|
|
|
// Handle inline images
|
|
public function _doImages_inline_callback($matches) {
|
|
$width = $height = 0;
|
|
$src = $matches[3]=="" ? $matches[4] : $matches[3];
|
|
if (!preg_match("/^\w+:/", $src)) {
|
|
list($width, $height) = $this->yellow->toolbox->detectImageInformation($this->yellow->system->get("imageDir").$src);
|
|
$src = $this->yellow->system->get("serverBase").$this->yellow->system->get("imageLocation").$src;
|
|
}
|
|
$alt = $matches[2];
|
|
$title = $matches[7]=="" ? $matches[2] : $matches[7];
|
|
$attr = $this->doExtraAttributes("img", $dummy =& $matches[8]);
|
|
$output = "<img src=\"".$this->encodeURLAttribute($src)."\"";
|
|
if ($width && $height) $output .= " width=\"$width\" height=\"$height\"";
|
|
if (!empty($alt)) $output .= " alt=\"".$this->encodeAttribute($alt)."\"";
|
|
if (!empty($title)) $output .= " title=\"".$this->encodeAttribute($title)."\"";
|
|
$output .= $attr;
|
|
$output .= $this->empty_element_suffix;
|
|
return $this->hashPart($output);
|
|
}
|
|
|
|
// Return unique id attribute
|
|
public function getIdAttribute($text) {
|
|
$text = $this->yellow->lookup->normaliseName($text, true, false, true);
|
|
$text = trim(preg_replace("/-+/", "-", $text), "-");
|
|
if (is_null($this->idAttributes[$text])) {
|
|
$this->idAttributes[$text] = $text;
|
|
$attr = " id=\"$text\"";
|
|
}
|
|
return $attr;
|
|
}
|
|
}
|