mirror of
https://github.com/friendica/friendica
synced 2024-12-25 01:20:16 +00:00
1896 lines
50 KiB
PHP
1896 lines
50 KiB
PHP
<?php
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/**
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* Markdown - A text-to-HTML conversion tool for web writers
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*
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* @package php-markdown
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* @author Michel Fortin <michel.fortin@michelf.com>
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* @copyright 2004-2016 Michel Fortin <https://michelf.com/projects/php-markdown/>
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* @copyright (Original Markdown) 2004-2006 John Gruber <https://daringfireball.net/projects/markdown/>
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*/
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namespace Michelf;
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/**
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* Markdown Parser Class
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*/
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class Markdown implements MarkdownInterface {
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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 = "1.7.0";
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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 $in_anchor = false;
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/**
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* Called before the transformation process starts to setup parser states.
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* @return void
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*/
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protected function setup() {
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// Clear global hashes.
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$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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$this->in_anchor = false;
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}
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/**
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* Called after the transformation process to clear any variable which may
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* be taking up memory unnecessarly.
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* @return void
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*/
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protected function teardown() {
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$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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'.$content.' # content, support nesting
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</\2> # the matching end tag
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[ ]* # trailing spaces/tabs
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(?=\n+|\Z) # followed by a newline or end of document
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| # Special version for tags of group a.
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[ ]{0,'.$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
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| # Special case for standalone HTML comments:
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[ ]{0,'.$less_than_tab.'}
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(?s:
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<!-- .*? -->
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)
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[ ]*
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(?=\n{2,}|\Z) # followed by a blank line or end of document
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| # PHP and ASP-style processor instructions (<? and <%)
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[ ]{0,'.$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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}
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/**
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* The callback for hashing HTML blocks
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* @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 $text so we do not have to `unhash`
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// multiple times at the end.
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$text = $this->unhash($text);
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// Then hash the block.
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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.
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}
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/**
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* Shortcut function for hashPart with block-level boundaries.
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* @param string $text
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* @return string
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*/
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protected function hashBlock($text) {
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return $this->hashPart($text, 'B');
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}
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/**
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* Define the block gamut - these are all the transformations that form
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* block-level tags like paragraphs, headers, and list items.
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* @var array
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*/
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protected $block_gamut = array(
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"doHeaders" => 10,
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"doHorizontalRules" => 20,
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"doLists" => 40,
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"doCodeBlocks" => 50,
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"doBlockQuotes" => 60,
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);
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/**
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* Run block gamut tranformations.
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*
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* We need to escape raw HTML in Markdown source before doing anything
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* else. This need to be done for each block, and not only at the
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* begining in the Markdown function since hashed blocks can be part of
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* list items and could have been indented. Indented blocks would have
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* been seen as a code block in a previous pass of hashHTMLBlocks.
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*
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* @param string $text
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* @return string
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*/
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protected function runBlockGamut($text) {
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$text = $this->hashHTMLBlocks($text);
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return $this->runBasicBlockGamut($text);
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}
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/**
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* Run block gamut tranformations, without hashing HTML blocks. This is
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* useful when HTML blocks are known to be already hashed, like in the first
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* whole-document pass.
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*
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* @param string $text
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* @return string
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*/
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protected function runBasicBlockGamut($text) {
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foreach ($this->block_gamut as $method => $priority) {
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$text = $this->$method($text);
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}
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// Finally form paragraph and restore hashed blocks.
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$text = $this->formParagraphs($text);
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return $text;
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}
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|
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/**
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* Convert horizontal rules
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|
* @param string $text
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* @return string
|
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*/
|
|
protected function doHorizontalRules($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: 
|
|
// 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) {
|
|
$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);
|
|
}
|
|
// 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;
|
|
}
|
|
}
|
|
}
|
|
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>
|
|
$text = preg_replace_callback('{
|
|
<
|
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(?:mailto:)?
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(
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(?:
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[-!#$%&\'*+/=?^_`.{|}~\w\x80-\xFF]+
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".*?"
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)
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\@
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(?:
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[-a-z0-9\x80-\xFF]+(\.[-a-z0-9\x80-\xFF]+)*\.[a-z]+
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\[[\d.a-fA-F:]+\] # IPv4 & IPv6
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)
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)
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>
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}xi',
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array($this, '_doAutoLinks_email_callback'), $text);
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return $text;
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}
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/**
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* Parse URL callback
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* @param array $matches
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* @return string
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*/
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protected function _doAutoLinks_url_callback($matches) {
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$url = $this->encodeURLAttribute($matches[1], $text);
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$link = "<a href=\"$url\">$text</a>";
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return $this->hashPart($link);
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}
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/**
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* Parse email address callback
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* @param array $matches
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* @return string
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*/
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protected function _doAutoLinks_email_callback($matches) {
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$addr = $matches[1];
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$url = $this->encodeURLAttribute("mailto:$addr", $text);
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$link = "<a href=\"$url\">$text</a>";
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return $this->hashPart($link);
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}
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/**
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* Input: some text to obfuscate, e.g. "mailto:foo@example.com"
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*
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* Output: the same text but with most characters encoded as either a
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* decimal or hex entity, in the hopes of foiling most address
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* harvesting spam bots. E.g.:
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*
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* mailto:foo
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* @example.co
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* m
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*
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* Note: the additional output $tail is assigned the same value as the
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* ouput, minus the number of characters specified by $head_length.
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*
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* Based by a filter by Matthew Wickline, posted to BBEdit-Talk.
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* With some optimizations by Milian Wolff. Forced encoding of HTML
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* attribute special characters by Allan Odgaard.
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*
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* @param string $text
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* @param string &$tail
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* @param integer $head_length
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* @return string
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*/
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protected function encodeEntityObfuscatedAttribute($text, &$tail = null, $head_length = 0) {
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if ($text == "") {
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return $tail = "";
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}
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$chars = preg_split('/(?<!^)(?!$)/', $text);
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$seed = (int)abs(crc32($text) / strlen($text)); // Deterministic seed.
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foreach ($chars as $key => $char) {
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$ord = ord($char);
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// Ignore non-ascii chars.
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if ($ord < 128) {
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$r = ($seed * (1 + $key)) % 100; // Pseudo-random function.
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// roughly 10% raw, 45% hex, 45% dec
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// '@' *must* be encoded. I insist.
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// '"' and '>' have to be encoded inside the attribute
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if ($r > 90 && strpos('@"&>', $char) === false) {
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/* do nothing */
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} else if ($r < 45) {
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$chars[$key] = '&#x'.dechex($ord).';';
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} else {
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$chars[$key] = '&#'.$ord.';';
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}
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}
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}
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$text = implode('', $chars);
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$tail = $head_length ? implode('', array_slice($chars, $head_length)) : $text;
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return $text;
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}
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/**
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* Take the string $str and parse it into tokens, hashing embeded HTML,
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* escaped characters and handling code spans.
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* @param string $str
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* @return string
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*/
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protected function parseSpan($str) {
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$output = '';
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$span_re = '{
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(
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\\\\'.$this->escape_chars_re.'
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|
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(?<![`\\\\])
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`+ # code span marker
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'.( $this->no_markup ? '' : '
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|
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<!-- .*? --> # comment
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<\?.*?\?> | <%.*?%> # processing instruction
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<[!$]?[-a-zA-Z0-9:_]+ # regular tags
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(?>
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\s
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(?>[^"\'>]+|"[^"]*"|\'[^\']*\')*
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)?
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>
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<[-a-zA-Z0-9:_]+\s*/> # xml-style empty tag
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</[-a-zA-Z0-9:_]+\s*> # closing tag
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').'
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)
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}xs';
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while (1) {
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// Each loop iteration seach for either the next tag, the next
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// openning code span marker, or the next escaped character.
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// Each token is then passed to handleSpanToken.
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$parts = preg_split($span_re, $str, 2, PREG_SPLIT_DELIM_CAPTURE);
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// Create token from text preceding tag.
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if ($parts[0] != "") {
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$output .= $parts[0];
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}
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// Check if we reach the end.
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if (isset($parts[1])) {
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$output .= $this->handleSpanToken($parts[1], $parts[2]);
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$str = $parts[2];
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} else {
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break;
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}
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}
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return $output;
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}
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/**
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* Handle $token provided by parseSpan by determining its nature and
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* returning the corresponding value that should replace it.
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* @param string $token
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* @param string &$str
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* @return string
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*/
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protected function handleSpanToken($token, &$str) {
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switch ($token{0}) {
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case "\\":
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return $this->hashPart("&#". ord($token{1}). ";");
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case "`":
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// Search for end marker in remaining text.
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if (preg_match('/^(.*?[^`])'.preg_quote($token).'(?!`)(.*)$/sm',
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$str, $matches))
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{
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$str = $matches[2];
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$codespan = $this->makeCodeSpan($matches[1]);
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return $this->hashPart($codespan);
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}
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return $token; // Return as text since no ending marker found.
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default:
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return $this->hashPart($token);
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}
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}
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/**
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* Remove one level of line-leading tabs or spaces
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|
* @param string $text
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* @return string
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*/
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protected function outdent($text) {
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return preg_replace('/^(\t|[ ]{1,' . $this->tab_width . '})/m', '', $text);
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}
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/**
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|
* String length function for detab. `_initDetab` will create a function to
|
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* handle UTF-8 if the default function does not exist.
|
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* @var string
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*/
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protected $utf8_strlen = 'mb_strlen';
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|
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/**
|
|
* Replace tabs with the appropriate amount of spaces.
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*
|
|
* 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
|
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* between each blocks.
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*
|
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* @param string $text
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* @return string
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*/
|
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protected function detab($text) {
|
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$text = preg_replace_callback('/^.*\t.*$/m',
|
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array($this, '_detab_callback'), $text);
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|
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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.
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|
|
// Split in blocks.
|
|
$blocks = explode("\t", $line);
|
|
// Add each blocks to the line.
|
|
$line = $blocks[0];
|
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unset($blocks[0]); // Do not add first block twice.
|
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foreach ($blocks as $block) {
|
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// Calculate amount of space, insert spaces, insert block.
|
|
$amount = $this->tab_width -
|
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$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;
|
|
}
|
|
|
|
$this->utf8_strlen = create_function('$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]];
|
|
}
|
|
}
|