/yii/framework/vendors/markdown/markdown.php
PHP | 1790 lines | 1184 code | 179 blank | 427 comment | 93 complexity | 74430a6dafbe26da748738ab6b6a66d8 MD5 | raw file
- <?php
- #
- # Markdown Extra - A text-to-HTML conversion tool for web writers
- #
- # PHP Markdown & Extra
- # Copyright (c) 2004-2008 Michel Fortin
- # <http://www.michelf.com/projects/php-markdown/>
- #
- # Original Markdown
- # Copyright (c) 2004-2006 John Gruber
- # <http://daringfireball.net/projects/markdown/>
- #
- #
- # Markdown Parser Class
- #
- class Markdown_Parser {
- # Regex to match balanced [brackets].
- # Needed to insert a maximum bracked depth while converting to PHP.
- public $nested_brackets_depth = 6;
- public $nested_brackets_re;
- public $nested_url_parenthesis_depth = 4;
- public $nested_url_parenthesis_re;
- # Table of hash values for escaped characters:
- public $escape_chars = '\`*_{}[]()>#+-.!';
- public $escape_chars_re;
- # Change to ">" for HTML output.
- public $empty_element_suffix = ' />';
- public $tab_width = 4;
- # Change to `true` to disallow markup or entities.
- public $no_markup = false;
- public $no_entities = false;
- # Predefined urls and titles for reference links and images.
- public $predef_urls = array();
- public $predef_titles = array();
- public function __construct() {
- #
- # Constructor function. Initialize appropriate member variables.
- #
- $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.
- public $urls = array();
- public $titles = array();
- public $html_hashes = array();
- # Status flag to avoid invalid nesting.
- public $in_anchor = false;
- public function setup() {
- #
- # Called before the transformation process starts to setup parser
- # states.
- #
- # Clear global hashes.
- $this->urls = $this->predef_urls;
- $this->titles = $this->predef_titles;
- $this->html_hashes = array();
- $in_anchor = false;
- }
- public function teardown() {
- #
- # Called after the transformation process to clear any variable
- # which may be taking up memory unnecessarly.
- #
- $this->urls = array();
- $this->titles = array();
- $this->html_hashes = array();
- }
- public function transform($text) {
- #
- # Main function. Performs some preprocessing on the input text
- # and pass it through the document gamut.
- #
- $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";
- }
- public $document_gamut = array(
- # Strip link definitions, store in hashes.
- "stripLinkDefinitions" => 20,
- "runBasicBlockGamut" => 30,
- );
- public function stripLinkDefinitions($text) {
- #
- # Strips link definitions from text, stores the URLs and titles in
- # hash references.
- #
- $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
- [ ]*
- <?(\S+?)>? # url = $2
- [ ]*
- \n? # maybe one newline
- [ ]*
- (?:
- (?<=\s) # lookbehind for whitespace
- ["(]
- (.*?) # title = $3
- [")]
- [ ]*
- )? # title is optional
- (?:\n+|\Z)
- }xm',
- array(&$this, '_stripLinkDefinitions_callback'),
- $text);
- return $text;
- }
- public function _stripLinkDefinitions_callback($matches) {
- $link_id = strtolower($matches[1]);
- $this->urls[$link_id] = $matches[2];
- $this->titles[$link_id] =& $matches[3];
- return ''; # String that will replace the block
- }
- public function hashHTMLBlocks($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|form|fieldset|iframe|math';
- # 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\n) # Starting after a blank line
- | # or
- \A\n? # the 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 $text;
- }
- public function _hashHTMLBlocks_callback($matches) {
- $text = $matches[1];
- $key = $this->hashBlock($text);
- return "\n\n$key\n\n";
- }
- public function hashPart($text, $boundary = 'X') {
- #
- # 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.
- #
- # 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 $key; # String that will replace the tag.
- }
- public function hashBlock($text) {
- #
- # Shortcut function for hashPart with block-level boundaries.
- #
- return $this->hashPart($text, 'B');
- }
- public $block_gamut = array(
- #
- # These are all the transformations that form block-level
- # tags like paragraphs, headers, and list items.
- #
- "doHeaders" => 10,
- "doHorizontalRules" => 20,
- "doLists" => 40,
- "doCodeBlocks" => 50,
- "doBlockQuotes" => 60,
- );
- public function runBlockGamut($text) {
- #
- # 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.
- $text = $this->hashHTMLBlocks($text);
- return $this->runBasicBlockGamut($text);
- }
- public function runBasicBlockGamut($text) {
- #
- # Run block gamut tranformations, without hashing HTML blocks. This is
- # useful when HTML blocks are known to be already hashed, like in the first
- # whole-document pass.
- #
- foreach ($this->block_gamut as $method => $priority) {
- $text = $this->$method($text);
- }
- # Finally form paragraph and restore hashed blocks.
- $text = $this->formParagraphs($text);
- return $text;
- }
- public function doHorizontalRules($text) {
- # Do Horizontal Rules:
- 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);
- }
- public $span_gamut = array(
- #
- # These are all the transformations that occur *within* block-level
- # tags like paragraphs, headers, and list items.
- #
- # Process character escapes, code spans, and inline HTML
- # in one shot.
- "parseSpan" => -30,
- # Process anchor and image tags. Images must come first,
- # because ![foo][f] looks like an anchor.
- "doImages" => 10,
- "doAnchors" => 20,
- # Make links out of things like `<http://example.com/>`
- # Must come after doAnchors, because you can use < and >
- # delimiters in inline links like [this](<url>).
- "doAutoLinks" => 30,
- "encodeAmpsAndAngles" => 40,
- "doItalicsAndBold" => 50,
- "doHardBreaks" => 60,
- );
- public function runSpanGamut($text) {
- #
- # Run span gamut tranformations.
- #
- foreach ($this->span_gamut as $method => $priority) {
- $text = $this->$method($text);
- }
- return $text;
- }
- public function doHardBreaks($text) {
- # Do hard breaks:
- return preg_replace_callback('/ {2,}\n/',
- array(&$this, '_doHardBreaks_callback'), $text);
- }
- public function _doHardBreaks_callback($matches) {
- return $this->hashPart("<br$this->empty_element_suffix\n");
- }
- public function doAnchors($text) {
- #
- # Turn Markdown link shortcuts into XHTML <a> tags.
- #
- if ($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
- \[
- ('.$this->nested_brackets_re.') # link text = $2
- \]
- \( # literal paren
- [ ]*
- (?:
- <(\S*)> # href = $3
- |
- ('.$this->nested_url_parenthesis_re.') # href = $4
- )
- [ ]*
- ( # $5
- ([\'"]) # quote char = $6
- (.*?) # Title = $7
- \6 # matching quote
- [ ]* # ignore any spaces/tabs between closing quote and )
- )? # title is optional
- \)
- )
- }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 test][1]
- # or [link test](/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 $text;
- }
- public function _doAnchors_reference_callback($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 = $this->encodeAttribute($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 $result;
- }
- public function _doAnchors_inline_callback($matches) {
- $whole_match = $matches[1];
- $link_text = $this->runSpanGamut($matches[2]);
- $url = $matches[3] == '' ? $matches[4] : $matches[3];
- $title =& $matches[7];
- $url = $this->encodeAttribute($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);
- }
- public function doImages($text) {
- #
- # Turn Markdown image shortcuts into <img> tags.
- #
- #
- # First, handle reference-style labeled images: ![alt text][id]
- #
- $text = preg_replace_callback('{
- ( # wrap whole match in $1
- !\[
- ('.$this->nested_brackets_re.') # alt text = $2
- \]
- [ ]? # one optional space
- (?:\n[ ]*)? # one optional newline followed by spaces
- \[
- (.*?) # id = $3
- \]
- )
- }xs',
- array(&$this, '_doImages_reference_callback'), $text);
- #
- # Next, handle inline images: ![alt text](url "optional title")
- # Don't forget: encode * and _
- #
- $text = preg_replace_callback('{
- ( # wrap whole match in $1
- !\[
- ('.$this->nested_brackets_re.') # alt text = $2
- \]
- \s? # One optional whitespace character
- \( # literal paren
- [ ]*
- (?:
- <(\S*)> # src url = $3
- |
- ('.$this->nested_url_parenthesis_re.') # src url = $4
- )
- [ ]*
- ( # $5
- ([\'"]) # quote char = $6
- (.*?) # title = $7
- \6 # matching quote
- [ ]*
- )? # title is optional
- \)
- )
- }xs',
- array(&$this, '_doImages_inline_callback'), $text);
- return $text;
- }
- public function _doImages_reference_callback($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 = $this->encodeAttribute($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 $result;
- }
- public function _doImages_inline_callback($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 = $this->encodeAttribute($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);
- }
- public 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 $text;
- }
- public function _doHeaders_callback_setext($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;
- $block = "<h$level>".$this->runSpanGamut($matches[1])."</h$level>";
- return "\n" . $this->hashBlock($block) . "\n\n";
- }
- public function _doHeaders_callback_atx($matches) {
- $level = strlen($matches[1]);
- $block = "<h$level>".$this->runSpanGamut($matches[2])."</h$level>";
- return "\n" . $this->hashBlock($block) . "\n\n";
- }
- public function doLists($text) {
- #
- # Form HTML ordered (numbered) and unordered (bulleted) lists.
- #
- $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+[.]';
- $marker_any_re = "(?:$marker_ul_re|$marker_ol_re)";
- $markers_relist = array($marker_ul_re, $marker_ol_re);
- foreach ($markers_relist as $marker_re) {
- # Re-usable pattern to match any entirel ul or ol list:
- $whole_list_re = '
- ( # $1 = whole list
- ( # $2
- [ ]{0,'.$less_than_tab.'}
- ('.$marker_re.') # $3 = first list item marker
- [ ]+
- )
- (?s:.+?)
- ( # $4
- \z
- |
- \n{2,}
- (?=\S)
- (?! # Negative lookahead for another list item marker
- [ ]*
- '.$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 $text;
- }
- public function _doLists_callback($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)";
- $list = $matches[1];
- $list_type = preg_match("/$marker_ul_re/", $matches[3]) ? "ul" : "ol";
- $marker_any_re = ( $list_type == "ul" ? $marker_ul_re : $marker_ol_re );
- $list .= "\n";
- $result = $this->processListItems($list, $marker_any_re);
- $result = $this->hashBlock("<$list_type>\n" . $result . "</$list_type>");
- return "\n". $result ."\n\n";
- }
- public $list_level = 0;
- public function processListItems($list_str, $marker_any_re) {
- #
- # Process the contents of a single ordered or unordered list, splitting it
- # into individual list items.
- #
- # 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 $list_str;
- }
- public function _processListItems_callback($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));
- $item = preg_replace('/\n+$/', '', $item);
- $item = $this->runSpanGamut($item);
- }
- return "<li>" . $item . "</li>\n";
- }
- public function doCodeBlocks($text) {
- #
- # Process Markdown `<pre><code>` blocks.
- #
- $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 $text;
- }
- public function _doCodeBlocks_callback($matches) {
- $codeblock = $matches[1];
- $codeblock = $this->outdent($codeblock);
- $codeblock = htmlspecialchars($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";
- }
- public function makeCodeSpan($code) {
- #
- # Create a code span markup for $code. Called from handleSpanToken.
- #
- $code = htmlspecialchars(trim($code), ENT_NOQUOTES);
- return $this->hashPart("<code>$code</code>");
- }
- public $em_relist = array(
- '' => '(?:(?<!\*)\*(?!\*)|(?<!_)_(?!_))(?=\S)(?![.,:;]\s)',
- '*' => '(?<=\S)(?<!\*)\*(?!\*)',
- '_' => '(?<=\S)(?<!_)_(?!_)',
- );
- public $strong_relist = array(
- '' => '(?:(?<!\*)\*\*(?!\*)|(?<!_)__(?!_))(?=\S)(?![.,:;]\s)',
- '**' => '(?<=\S)(?<!\*)\*\*(?!\*)',
- '__' => '(?<=\S)(?<!_)__(?!_)',
- );
- public $em_strong_relist = array(
- '' => '(?:(?<!\*)\*\*\*(?!\*)|(?<!_)___(?!_))(?=\S)(?![.,:;]\s)',
- '***' => '(?<=\S)(?<!\*)\*\*\*(?!\*)',
- '___' => '(?<=\S)(?<!_)___(?!_)',
- );
- public $em_strong_prepared_relist;
- public function prepareItalicsAndBold() {
- #
- # Prepare regular expressions for seraching emphasis tokens in any
- # context.
- #
- foreach ($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"] = $token_re;
- }
- }
- }
- public function doItalicsAndBold($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 seach 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 $text_stack[0];
- }
- public function doBlockQuotes($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 $text;
- }
- public function _doBlockQuotes_callback($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";
- }
- public function _doBlockQuotes_callback2($matches) {
- $pre = $matches[1];
- $pre = preg_replace('/^ /m', '', $pre);
- return $pre;
- }
- public function formParagraphs($text) {
- #
- # Params:
- # $text - string to process with html <p> tags
- #
- # 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);
- $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", $grafs);
- }
- public function encodeAttribute($text) {
- #
- # Encode text for a double-quoted HTML attribute. This function
- # is *not* suitable for attributes enclosed in single quotes.
- #
- $text = $this->encodeAmpsAndAngles($text);
- $text = str_replace('"', '"', $text);
- return $text;
- }
- public function encodeAmpsAndAngles($text) {
- #
- # 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.
- #
- 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 $text;
- }
- public function doAutoLinks($text) {
- $text = preg_replace_callback('{<((https?|ftp|dict):[^\'">\s]+)>}i',
- array(&$this, '_doAutoLinks_url_callback'), $text);
- # Email addresses: <address@domain.foo>
- $text = preg_replace_callback('{
- <
- (?:mailto:)?
- (
- [-.\w\x80-\xFF]+
- \@
- [-a-z0-9\x80-\xFF]+(\.[-a-z0-9\x80-\xFF]+)*\.[a-z]+
- )
- >
- }xi',
- array(&$this, '_doAutoLinks_email_callback'), $text);
- return $text;
- }
- public function _doAutoLinks_url_callback($matches) {
- $url = $this->encodeAttribute($matches[1]);
- $link = "<a href=\"$url\">$url</a>";
- return $this->hashPart($link);
- }
- public function _doAutoLinks_email_callback($matches) {
- $address = $matches[1];
- $link = $this->encodeEmailAddress($address);
- return $this->hashPart($link);
- }
- public function encodeEmailAddress($addr) {
- #
- # Input: an email address, e.g. "foo@example.com"
- #
- # Output: the email address as a mailto link, with each character
- # of the address encoded as either a decimal or hex entity, in
- # the hopes of foiling most address harvesting spam bots. E.g.:
- #
- # <p><a href="mailto:foo
- # @example.co
- # m">foo@exampl
- # e.com</a></p>
- #
- # Based by a filter by Matthew Wickline, posted to BBEdit-Talk.
- # With some optimizations by Milian Wolff.
- #
- $addr = "mailto:" . $addr;
- $chars = preg_split('/(?<!^)(?!$)/', $addr);
- $seed = (int)abs(crc32($addr) / strlen($addr)); # Deterministic seed.
- foreach ($chars as $key => $char) {
- $ord = ord($char);
- # Ignore non-ascii chars.
- if ($ord < 128) {
- $r = ($seed * (1 + $key)) % 100; # Pseudo-random function.
- # roughly 10% raw, 45% hex, 45% dec
- # '@' *must* be encoded. I insist.
- if ($r > 90 && $char != '@') /* do nothing */;
- else if ($r < 45) $chars[$key] = '&#x'.dechex($ord).';';
- else $chars[$key] = '&#'.$ord.';';
- }
- }
- $addr = implode('', $chars);
- $text = implode('', array_slice($chars, 7)); # text without `mailto:`
- $addr = "<a href=\"$addr\">$text</a>";
- return $addr;
- }
- public function parseSpan($str) {
- #
- # Take the string $str and parse it into tokens, hashing embeded HTML,
- # escaped characters and handling code spans.
- #
- $output = '';
- $span_re = '{
- (
- \\\\'.$this->escape_chars_re.'
- |
- (?<![`\\\\])
- `+ # code span marker
- '.( $this->no_markup ? '' : '
- |
- <!-- .*? --> # comment
- |
- <\?.*?\?> | <%.*?%> # processing instruction
- |
- <[/!$]?[-a-zA-Z0-9:]+ # regular tags
- (?>
- \s
- (?>[^"\'>]+|"[^"]*"|\'[^\']*\')*
- )?
- >
- ').'
- )
- }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 $output;
- }
- public function handleSpanToken($token, &$str) {
- #
- # Handle $token provided by parseSpan by determining its nature and
- # returning the corresponding value that should replace it.
- #
- switch ($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);
- }
- }
- public function outdent($text) {
- #
- # Remove one level of line-leading tabs or spaces
- #
- return preg_replace('/^(\t|[ ]{1,'.$this->tab_width.'})/m', '', $text);
- }
- # String length function for detab. `_initDetab` will create a function to
- # hanlde UTF-8 if the default function does not exist.
- public $utf8_strlen = 'mb_strlen';
- public function detab($text) {
- #
- # Replace tabs with the appropriate amount of space.
- #
- # 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.
- $text = preg_replace_callback('/^.*\t.*$/m',
- array(&$this, '_detab_callback'), $text);
- return $text;
- }
- public function _detab_callback($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 $line;
- }
- public function _initDetab() {
- #
- # Check for the availability of the function in the `utf8_strlen` property
- # (initially `mb_strlen`). If the function is not available, create a
- # function that will loosely count the number of UTF-8 characters with a
- # regular expression.
- #
- if (function_exists($this->utf8_strlen)) return;
- $this->utf8_strlen = create_function('$text', 'return preg_match_all(
- "/[\\\\x00-\\\\xBF]|[\\\\xC0-\\\\xFF][\\\\x80-\\\\xBF]*/",
- $text, $m);');
- }
- public function unhash($text) {
- #
- # Swap back in all the tags hashed by _HashHTMLBlocks.
- #
- return preg_replace_callback('/(.)\x1A[0-9]+\1/',
- array(&$this, '_unhash_callback'), $text);
- }
- public function _unhash_callback($matches) {
- return $this->html_hashes[$matches[0]];
- }
- }
- #
- # Markdown Extra Parser Class
- #
- class MarkdownExtra_Parser extends Markdown_Parser {
- # Prefix for footnote ids.
- public $fn_id_prefix = "";
- # Optional title attribute for footnote links and backlinks.
- public $fn_link_title = '';
- public $fn_backlink_title = '';
- # Optional class attribute for footnote links and backlinks.
- public $fn_link_class = '';
- public $fn_backlink_class = '';
- # Predefined abbreviations.
- public $predef_abbr = array();
- public function __construct() {
- #
- # Constructor function. Initialize the parser object.
- #
- # Add extra escapable characters before parent constructor
- # initialize the table.
- $this->escape_chars .= ':|';
- # Insert extra document, block, and span transformations.
- # Parent constructor will do the sorting.
- $this->document_gamut += array(
- "doFencedCodeBlocks" => 5,
- "stripFootnotes" => 15,
- "stripAbbreviations" => 25,
- "appendFootnotes" => 50,
- );
- $this->block_gamut += array(
- "doFencedCodeBlocks" => 5,
- "doTables" => 15,
- "doDefLists" => 45,
- );
- $this->span_gamut += array(
- "doFootnotes" => 5,
- "doAbbreviations" => 70,
- );
- parent::__construct();
- }
- # Extra variables used during extra transformations.
- public $footnotes = array();
- public $footnotes_ordered = array();
- public $abbr_desciptions = array();
- public $abbr_word_re = '';
- # Give the current footnote number.
- public $footnote_counter = 1;
- public function setup() {
- #
- # Setting up Extra-specific variables.
- #
- parent::setup();
- $this->footnotes = array();
- $this->footnotes_ordered = array();
- $this->abbr_desciptions = array();
- $this->abbr_word_re = '';
- $this->footnote_counter = 1;
- foreach ($this->predef_abbr as $abbr_word => $abbr_desc) {
- if ($this->abbr_word_re)
- $this->abbr_word_re .= '|';
- $this->abbr_word_re .= preg_quote($abbr_word);
- $this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
- }
- }
- public function teardown() {
- #
- # Clearing Extra-specific variables.
- #
- $this->footnotes = array();
- $this->footnotes_ordered = array();
- $this->abbr_desciptions = array();
- $this->abbr_word_re = '';
- parent::teardown();
- }
- ### HTML Block Parser ###
- # Tags that are always treated as block tags:
- public $block_tags_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend';
- # Tags treated as block tags only if the opening tag is alone on it's line:
- public $context_block_tags_re = 'script|noscript|math|ins|del';
- # Tags where markdown="1" default to span mode:
- public $contain_span_tags_re = 'p|h[1-6]|li|dd|dt|td|th|legend|address';
- # Tags which must not have their contents modified, no matter where
- # they appear:
- public $clean_tags_re = 'script|math';
- # Tags that do not need to be closed.
- public $auto_close_tags_re = 'hr|img';
- public function hashHTMLBlocks($text) {
- #
- # Hashify HTML Blocks and "clean tags".
- #
- # We only want to do this for block-level HTML tags, such as headers,
- # lists, and tables. That's because we still want to wrap <p>s around
- # "paragraphs" that are wrapped in non-block-level tags, such as anchors,
- # phrase emphasis, and spans. The list of tags we're looking for is
- # hard-coded.
- #
- # This works by calling _HashHTMLBlocks_InMarkdown, which then calls
- # _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1"
- # attribute is found whitin a tag, _HashHTMLBlocks_InHTML calls back
- # _HashHTMLBlocks_InMarkdown to handle the Markdown syntax within the tag.
- # These two functions are calling each other. It's recursive!
- #
- #
- # Call the HTML-in-Markdown hasher.
- #
- list($text, ) = $this->_hashHTMLBlocks_inMarkdown($text);
- return $text;
- }
- public function _hashHTMLBlocks_inMarkdown($text, $indent = 0,
- $enclosing_tag_re = '', $span = false)
- {
- #
- # Parse markdown text, calling _HashHTMLBlocks_InHTML for block tags.
- #
- # * $indent is the number of space to be ignored when checking for code
- # blocks. This is important because if we don't take the indent into
- # account, something like this (which looks right) won't work as expected:
- #
- # <div>
- # <div markdown="1">
- # Hello World. <-- Is this a Markdown code block or text?
- # </div> <-- Is this a Markdown code block or a real tag?
- # <div>
- #
- # If you don't like this, just don't indent the tag on which
- # you apply the markdown="1" attribute.
- #
- # * If $enclosing_tag_re is not empty, stops at the first unmatched closing
- # tag with that name. Nested tags supported.
- #
- # * If $span is true, text inside must treated as span. So any double
- # newline will be replaced by a single newline so that it does not create
- # paragraphs.
- #
- # Returns an array of that form: ( processed text , remaining text )
- #
- if ($text === '') return array('', '');
- # Regex to check for the presense of newlines around a block tag.
- $newline_before_re = '/(?:^\n?|\n\n)*$/';
- $newline_after_re =
- '{
- ^ # Start of text following the tag.
- (?>[ ]*<!--.*?-->)? # Optional comment.
- [ ]*\n # Must be followed by newline.
- }xs';
- # Regex to match any tag.
- $block_tag_re =
- '{
- ( # $2: Capture hole tag.
- </? # Any opening or closing tag.
- (?> # Tag name.
- '.$this->block_tags_re.' |
- '.$this->context_block_tags_re.' |
- '.$this->clean_tags_re.' |
- (?!\s)'.$enclosing_tag_re.'
- )
- (?:
- (?=[\s"\'/]) # Allowed characters after tag name.
- (?>
- ".*?" | # Double quotes (can contain `>`)
- \'.*?\' | # Single quotes (can contain `>`)
- .+? # Anything but quotes and `>`.
- )*?
- )?
- > # End of tag.
- |
- <!-- .*? --> # HTML Comment
- |
- <\?.*?\?> | <%.*?%> # Processing instruction
- |
- <!\[CDATA\[.*?\]\]> # CData Block
- |
- # Code span marker
- `+
- '. ( !$span ? ' # If not in span.
- |
- # Indented code block
- (?> ^[ ]*\n? | \n[ ]*\n )
- [ ]{'.($indent+4).'}[^\n]* \n
- (?>
- (?: [ ]{'.($indent+4).'}[^\n]* | [ ]* ) \n
- )*
- |
- # Fenced code block marker
- (?> ^ | \n )
- [ ]{'.($indent).'}~~~+[ ]*\n
- ' : '' ). ' # End (if not is span).
- )
- }xs';
- $depth = 0; # Current depth inside the tag tree.
- $parsed = ""; # Parsed text that will be returned.
- #
- # Loop through every tag until we find the closing tag of the parent
- # or loop until reaching the end of text if no parent tag specified.
- #
- do {
- #
- # Split the text using the first $tag_match pattern found.
- # Text before pattern will be first in the array, text after
- # pattern will be at the end, and between will be any catches made
- # by the pattern.
- #
- $parts = preg_split($block_tag_re, $text, 2,
- PREG_SPLIT_DELIM_CAPTURE);
- # If in Markdown span mode, add a empty-string span-level hash
- # after each newline to prevent triggering any block element.
- if ($span) {
- $void = $this->hashPart("", ':');
- $newline = "$void\n";
- $parts[0] = $void . str_replace("\n", $newline, $parts[0]) . $void;
- }
- $parsed .= $parts[0]; # Text before current tag.
- # If end of $text has been reached. Stop loop.
- if (count($parts) < 3) {
- $text = "";
- break;
- }
- $tag = $parts[1]; # Tag to handle.
- $text = $parts[2]; # Remaining text after current tag.
- $tag_re = preg_quote($tag); # For use in a regular expression.
- #
- # Check for: Code span marker
- #
- if ($tag{0} == "`") {
- # Find corresponding end marker.
- $tag_re = preg_quote($tag);
- if (preg_match('{^(?>.+?|\n(?!\n))*?(?<!`)'.$tag_re.'(?!`)}',
- $text, $matches))
- {
- # End marker found: pass text unchanged until marker.
- $parsed .= $tag . $matches[0];
- $text = substr($text, strlen($matches[0]));
- }
- else {
- # Unmatched marker: just skip it.
- $parsed .= $tag;
- }
- }
- #
- # Check for: Indented code block or fenced code block marker.
- #
- else if ($tag{0} == "\n" || $tag{0} == "~") {
- if ($tag{1} == "\n" || $tag{1} == " ") {
- # Indented code block: pass it unchanged, will be handled
- # later.
- $parsed .= $tag;
- }
- else {
- # Fenced code block marker: find matching end marker.
- $tag_re = preg_quote(trim($tag));
- if (preg_match('{^(?>.*\n)+?'.$tag_re.' *\n}', $text,
- $matches))
- {
- # End marker found: pass text unchanged until marker.
- $parsed .= $tag . $matches[0];
- $text = substr($text, strlen($matches[0]));
- }
- else {
- # No end marker: just skip it.
- $parsed .= $tag;
- }
- }
- }
- #
- # Check for: Opening Block level tag or
- # Opening Context Block tag (like ins and del)
- # used as a block tag (tag is alone on it's line).
- #
- else if (preg_match('{^<(?:'.$this->block_tags_re.')\b}', $tag) ||
- ( preg_match('{^<(?:'.$this->context_block_tags_re.')\b}', $tag) &&
- preg_match($newline_before_re, $parsed) &&
- preg_match($newline_after_re, $text) )
- )
- {
- # Need to parse tag and following text using the HTML parser.
- list($block_text, $text) =
- $this->_hashHTMLBlocks_inHTML($tag . $text, "hashBlock", true);
- # Make sure it stays outside of any paragraph by adding newlines.
- $parsed .= "\n\n$block_text\n\n";
- }
- #
- # Check for: Clean tag (like script, math)
- # HTML Comments, processing instructions.
- #
- else if (preg_match('{^<(?:'.$this->clean_tags_re.')\b}', $tag) ||
- $tag{1} == '!' || $tag{1} == '?')
- {
- # Need to parse tag and following text using the HTML parser.
- # (don't check for markdown attribute)
- list($block_text, $text) =
- $this->_hashHTMLBlocks_inHTML($tag . $text, "hashClean", false);
- $parsed .= $block_text;
- }
- #
- # Check for: Tag with same name as enclosing tag.
- #
- else i