--- /dev/null
+<?php
+/**
+ * Markdown - A text-to-HTML conversion tool for web writers
+ *
+ * @package php-markdown
+ * @author Michel Fortin <michel.fortin@michelf.com>
+ * @copyright 2004-2016 Michel Fortin <https://michelf.com/projects/php-markdown/>
+ * @copyright (Original Markdown) 2004-2006 John Gruber <https://daringfireball.net/projects/markdown/>
+ */
+
+namespace Michelf;
+
+/**
+ * Markdown Parser Class
+ */
+class Markdown implements MarkdownInterface {
+ /**
+ * Define the package version
+ * @var string
+ */
+ const MARKDOWNLIB_VERSION = "1.7.0";
+
+ /**
+ * Simple function interface - Initialize the parser and return the result
+ * of its transform method. This will work fine for derived classes too.
+ *
+ * @api
+ *
+ * @param string $text
+ * @return string
+ */
+ public static function defaultTransform($text) {
+ // Take parser class on which this function was called.
+ $parser_class = \get_called_class();
+
+ // Try to take parser from the static parser list
+ static $parser_list;
+ $parser =& $parser_list[$parser_class];
+
+ // Create the parser it not already set
+ if (!$parser) {
+ $parser = new $parser_class;
+ }
+
+ // Transform text using parser.
+ return $parser->transform($text);
+ }
+
+ /**
+ * Configuration variables
+ */
+
+ /**
+ * Change to ">" for HTML output.
+ * @var string
+ */
+ public $empty_element_suffix = " />";
+
+ /**
+ * The width of indentation of the output markup
+ * @var int
+ */
+ public $tab_width = 4;
+
+ /**
+ * Change to `true` to disallow markup or entities.
+ * @var boolean
+ */
+ public $no_markup = false;
+ public $no_entities = false;
+
+
+ /**
+ * Change to `true` to enable line breaks on \n without two trailling spaces
+ * @var boolean
+ */
+ public $hard_wrap = false;
+
+ /**
+ * Predefined URLs and titles for reference links and images.
+ * @var array
+ */
+ public $predef_urls = array();
+ public $predef_titles = array();
+
+ /**
+ * Optional filter function for URLs
+ * @var callable
+ */
+ public $url_filter_func = null;
+
+ /**
+ * Optional header id="" generation callback function.
+ * @var callable
+ */
+ public $header_id_func = null;
+
+ /**
+ * Optional function for converting code block content to HTML
+ * @var callable
+ */
+ public $code_block_content_func = null;
+
+ /**
+ * Optional function for converting code span content to HTML.
+ * @var callable
+ */
+ public $code_span_content_func = null;
+
+ /**
+ * Class attribute to toggle "enhanced ordered list" behaviour
+ * setting this to true will allow ordered lists to start from the index
+ * number that is defined first.
+ *
+ * For example:
+ * 2. List item two
+ * 3. List item three
+ *
+ * Becomes:
+ * <ol start="2">
+ * <li>List item two</li>
+ * <li>List item three</li>
+ * </ol>
+ *
+ * @var bool
+ */
+ public $enhanced_ordered_list = false;
+
+ /**
+ * Parser implementation
+ */
+
+ /**
+ * Regex to match balanced [brackets].
+ * Needed to insert a maximum bracked depth while converting to PHP.
+ * @var int
+ */
+ protected $nested_brackets_depth = 6;
+ protected $nested_brackets_re;
+
+ protected $nested_url_parenthesis_depth = 4;
+ protected $nested_url_parenthesis_re;
+
+ /**
+ * Table of hash values for escaped characters:
+ * @var string
+ */
+ protected $escape_chars = '\`*_{}[]()>#+-.!';
+ protected $escape_chars_re;
+
+ /**
+ * Constructor function. Initialize appropriate member variables.
+ * @return void
+ */
+ public function __construct() {
+ $this->_initDetab();
+ $this->prepareItalicsAndBold();
+
+ $this->nested_brackets_re =
+ str_repeat('(?>[^\[\]]+|\[', $this->nested_brackets_depth).
+ str_repeat('\])*', $this->nested_brackets_depth);
+
+ $this->nested_url_parenthesis_re =
+ str_repeat('(?>[^()\s]+|\(', $this->nested_url_parenthesis_depth).
+ str_repeat('(?>\)))*', $this->nested_url_parenthesis_depth);
+
+ $this->escape_chars_re = '['.preg_quote($this->escape_chars).']';
+
+ // Sort document, block, and span gamut in ascendent priority order.
+ asort($this->document_gamut);
+ asort($this->block_gamut);
+ asort($this->span_gamut);
+ }
+
+
+ /**
+ * Internal hashes used during transformation.
+ * @var array
+ */
+ protected $urls = array();
+ protected $titles = array();
+ protected $html_hashes = array();
+
+ /**
+ * Status flag to avoid invalid nesting.
+ * @var boolean
+ */
+ protected $in_anchor = false;
+
+ /**
+ * Called before the transformation process starts to setup parser states.
+ * @return void
+ */
+ protected function setup() {
+ // Clear global hashes.
+ $this->urls = $this->predef_urls;
+ $this->titles = $this->predef_titles;
+ $this->html_hashes = array();
+ $this->in_anchor = false;
+ }
+
+ /**
+ * Called after the transformation process to clear any variable which may
+ * be taking up memory unnecessarly.
+ * @return void
+ */
+ protected function teardown() {
+ $this->urls = array();
+ $this->titles = array();
+ $this->html_hashes = array();
+ }
+
+ /**
+ * Main function. Performs some preprocessing on the input text and pass
+ * it through the document gamut.
+ *
+ * @api
+ *
+ * @param string $text
+ * @return string
+ */
+ public function transform($text) {
+ $this->setup();
+
+ # Remove UTF-8 BOM and marker character in input, if present.
+ $text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text);
+
+ # Standardize line endings:
+ # DOS to Unix and Mac to Unix
+ $text = preg_replace('{\r\n?}', "\n", $text);
+
+ # Make sure $text ends with a couple of newlines:
+ $text .= "\n\n";
+
+ # Convert all tabs to spaces.
+ $text = $this->detab($text);
+
+ # Turn block-level HTML blocks into hash entries
+ $text = $this->hashHTMLBlocks($text);
+
+ # Strip any lines consisting only of spaces and tabs.
+ # This makes subsequent regexen easier to write, because we can
+ # match consecutive blank lines with /\n+/ instead of something
+ # contorted like /[ ]*\n+/ .
+ $text = preg_replace('/^[ ]+$/m', '', $text);
+
+ # Run document gamut methods.
+ foreach ($this->document_gamut as $method => $priority) {
+ $text = $this->$method($text);
+ }
+
+ $this->teardown();
+
+ return $text . "\n";
+ }
+
+ /**
+ * Define the document gamut
+ * @var array
+ */
+ protected $document_gamut = array(
+ // Strip link definitions, store in hashes.
+ "stripLinkDefinitions" => 20,
+ "runBasicBlockGamut" => 30,
+ );
+
+ /**
+ * 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 = $4
+ [")]
+ [ ]*
+ )? # title is optional
+ (?:\n+|\Z)
+ }xm',
+ array($this, '_stripLinkDefinitions_callback'),
+ $text
+ );
+ return $text;
+ }
+
+ /**
+ * The callback to strip link definitions
+ * @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];
+ return ''; // String that will replace the block
+ }
+
+ /**
+ * Hashify HTML blocks
+ * @param string $text
+ * @return string
+ */
+ protected function hashHTMLBlocks($text) {
+ if ($this->no_markup) {
+ return $text;
+ }
+
+ $less_than_tab = $this->tab_width - 1;
+
+ /**
+ * Hashify HTML blocks:
+ *
+ * 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:
+ *
+ * * List "a" is made of tags which can be both inline or block-level.
+ * These will be treated block-level when the start tag is alone on
+ * its line, otherwise they're not matched here and will be taken as
+ * inline later.
+ * * List "b" is made of tags which are always block-level;
+ */
+ $block_tags_a_re = 'ins|del';
+ $block_tags_b_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|'.
+ 'script|noscript|style|form|fieldset|iframe|math|svg|'.
+ 'article|section|nav|aside|hgroup|header|footer|'.
+ 'figure';
+
+ // Regular expression for the content of a block tag.
+ $nested_tags_level = 4;
+ $attr = '
+ (?> # optional tag attributes
+ \s # starts with whitespace
+ (?>
+ [^>"/]+ # text outside quotes
+ |
+ /+(?!>) # slash not followed by ">"
+ |
+ "[^"]*" # text inside double quotes (tolerate ">")
+ |
+ \'[^\']*\' # text inside single quotes (tolerate ">")
+ )*
+ )?
+ ';
+ $content =
+ str_repeat('
+ (?>
+ [^<]+ # content without tag
+ |
+ <\2 # nested opening tag
+ '.$attr.' # attributes
+ (?>
+ />
+ |
+ >', $nested_tags_level). // end of opening tag
+ '.*?'. // last level nested tag content
+ str_repeat('
+ </\2\s*> # closing nested tag
+ )
+ |
+ <(?!/\2\s*> # other tags with a different name
+ )
+ )*',
+ $nested_tags_level);
+ $content2 = str_replace('\2', '\3', $content);
+
+ /**
+ * First, look for nested blocks, e.g.:
+ * <div>
+ * <div>
+ * tags for inner block must be indented.
+ * </div>
+ * </div>
+ *
+ * The outermost tags must start at the left margin for this to match,
+ * and the inner nested divs must be indented.
+ * We need to do this before the next, more liberal match, because the
+ * next match will start at the first `<div>` and stop at the
+ * first `</div>`.
+ */
+ $text = preg_replace_callback('{(?>
+ (?>
+ (?<=\n) # Starting on its own line
+ | # or
+ \A\n? # the at beginning of the doc
+ )
+ ( # save in $1
+
+ # Match from `\n<tag>` to `</tag>\n`, handling nested tags
+ # in between.
+
+ [ ]{0,'.$less_than_tab.'}
+ <('.$block_tags_b_re.')# start tag = $2
+ '.$attr.'> # attributes followed by > and \n
+ '.$content.' # content, support nesting
+ </\2> # the matching end tag
+ [ ]* # trailing spaces/tabs
+ (?=\n+|\Z) # followed by a newline or end of document
+
+ | # Special version for tags of group a.
+
+ [ ]{0,'.$less_than_tab.'}
+ <('.$block_tags_a_re.')# start tag = $3
+ '.$attr.'>[ ]*\n # attributes followed by >
+ '.$content2.' # content, support nesting
+ </\3> # the matching end tag
+ [ ]* # trailing spaces/tabs
+ (?=\n+|\Z) # followed by a newline or end of document
+
+ | # Special case just for <hr />. It was easier to make a special
+ # case than to make the other regex more complicated.
+
+ [ ]{0,'.$less_than_tab.'}
+ <(hr) # start tag = $2
+ '.$attr.' # attributes
+ /?> # the matching end tag
+ [ ]*
+ (?=\n{2,}|\Z) # followed by a blank line or end of document
+
+ | # Special case for standalone HTML comments:
+
+ [ ]{0,'.$less_than_tab.'}
+ (?s:
+ <!-- .*? -->
+ )
+ [ ]*
+ (?=\n{2,}|\Z) # followed by a blank line or end of document
+
+ | # PHP and ASP-style processor instructions (<? and <%)
+
+ [ ]{0,'.$less_than_tab.'}
+ (?s:
+ <([?%]) # $2
+ .*?
+ \2>
+ )
+ [ ]*
+ (?=\n{2,}|\Z) # followed by a blank line or end of document
+
+ )
+ )}Sxmi',
+ array($this, '_hashHTMLBlocks_callback'),
+ $text
+ );
+
+ return $text;
+ }
+
+ /**
+ * The callback for hashing HTML blocks
+ * @param string $matches
+ * @return string
+ */
+ protected function _hashHTMLBlocks_callback($matches) {
+ $text = $matches[1];
+ $key = $this->hashBlock($text);
+ return "\n\n$key\n\n";
+ }
+
+ /**
+ * Called whenever a tag must be hashed when a function insert an atomic
+ * element in the text stream. Passing $text to through this function gives
+ * a unique text-token which will be reverted back when calling unhash.
+ *
+ * The $boundary argument specify what character should be used to surround
+ * the token. By convension, "B" is used for block elements that needs not
+ * to be wrapped into paragraph tags at the end, ":" is used for elements
+ * that are word separators and "X" is used in the general case.
+ *
+ * @param string $text
+ * @param string $boundary
+ * @return string
+ */
+ protected function hashPart($text, $boundary = 'X') {
+ // Swap back any tag hash found in $text so we do not have to `unhash`
+ // multiple times at the end.
+ $text = $this->unhash($text);
+
+ // Then hash the block.
+ static $i = 0;
+ $key = "$boundary\x1A" . ++$i . $boundary;
+ $this->html_hashes[$key] = $text;
+ 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) {
+ 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: 
+ // 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>
+ $text = preg_replace_callback('{
+ <
+ (?:mailto:)?
+ (
+ (?:
+ [-!#$%&\'*+/=?^_`.{|}~\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;
+ }
+
+ $this->utf8_strlen = create_function('$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]];
+ }
+}
projects / yaffs-website / blobdiff