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Code Editor : MarkdownExtra.php
<?php /** * Markdown Extra - A text-to-HTML conversion tool for web writers * * @package php-markdown * @author Michel Fortin <michel.fortin@michelf.com> * @copyright 2004-2018 Michel Fortin <https://michelf.com/projects/php-markdown/> * @copyright (Original Markdown) 2004-2006 John Gruber <https://daringfireball.net/projects/markdown/> */ namespace Michelf; /** * Markdown Extra Parser Class */ class MarkdownExtra extends \Michelf\Markdown { /** * Configuration variables */ /** * Prefix for footnote ids. * @var string */ public $fn_id_prefix = ""; /** * Optional title attribute for footnote links and backlinks. * @var string */ public $fn_link_title = ""; public $fn_backlink_title = ""; /** * Optional class attribute for footnote links and backlinks. * @var string */ public $fn_link_class = "footnote-ref"; public $fn_backlink_class = "footnote-backref"; /** * Content to be displayed within footnote backlinks. The default is '↩'; * the U+FE0E on the end is a Unicode variant selector used to prevent iOS * from displaying the arrow character as an emoji. * @var string */ public $fn_backlink_html = '↩︎'; /** * Class name for table cell alignment (%% replaced left/center/right) * For instance: 'go-%%' becomes 'go-left' or 'go-right' or 'go-center' * If empty, the align attribute is used instead of a class name. * @var string */ public $table_align_class_tmpl = ''; /** * Optional class prefix for fenced code block. * @var string */ public $code_class_prefix = ""; /** * Class attribute for code blocks goes on the `code` tag; * setting this to true will put attributes on the `pre` tag instead. * @var boolean */ public $code_attr_on_pre = false; /** * Predefined abbreviations. * @var array */ public $predef_abbr = array(); /** * Only convert atx-style headers if there's a space between the header and # * @var boolean */ public $hashtag_protection = false; /** * Parser implementation */ /** * Constructor function. Initialize the parser object. * @return void */ public function __construct() { // Add extra escapable characters before parent constructor // initialize the table. $this->escape_chars .= ':|'; // Insert extra document, block, and span transformations. // Parent constructor will do the sorting. $this->document_gamut += array( "doFencedCodeBlocks" => 5, "stripFootnotes" => 15, "stripAbbreviations" => 25, "appendFootnotes" => 50, ); $this->block_gamut += array( "doFencedCodeBlocks" => 5, "doTables" => 15, "doDefLists" => 45, ); $this->span_gamut += array( "doFootnotes" => 5, "doAbbreviations" => 70, ); $this->enhanced_ordered_list = true; parent::__construct(); } /** * Extra variables used during extra transformations. * @var array */ protected $footnotes = array(); protected $footnotes_ordered = array(); protected $footnotes_ref_count = array(); protected $footnotes_numbers = array(); protected $abbr_desciptions = array(); /** @var string */ protected $abbr_word_re = ''; /** * Give the current footnote number. * @var integer */ protected $footnote_counter = 1; /** * Setting up Extra-specific variables. */ protected function setup() { parent::setup(); $this->footnotes = array(); $this->footnotes_ordered = array(); $this->footnotes_ref_count = array(); $this->footnotes_numbers = array(); $this->abbr_desciptions = array(); $this->abbr_word_re = ''; $this->footnote_counter = 1; foreach ($this->predef_abbr as $abbr_word => $abbr_desc) { if ($this->abbr_word_re) $this->abbr_word_re .= '|'; $this->abbr_word_re .= preg_quote($abbr_word); $this->abbr_desciptions[$abbr_word] = trim($abbr_desc); } } /** * Clearing Extra-specific variables. */ protected function teardown() { $this->footnotes = array(); $this->footnotes_ordered = array(); $this->footnotes_ref_count = array(); $this->footnotes_numbers = array(); $this->abbr_desciptions = array(); $this->abbr_word_re = ''; parent::teardown(); } /** * Extra attribute parser */ /** * Expression to use to catch attributes (includes the braces) * @var string */ protected $id_class_attr_catch_re = '\{((?>[ ]*[#.a-z][-_:a-zA-Z0-9=]+){1,})[ ]*\}'; /** * Expression to use when parsing in a context when no capture is desired * @var string */ protected $id_class_attr_nocatch_re = '\{(?>[ ]*[#.a-z][-_:a-zA-Z0-9=]+){1,}[ ]*\}'; /** * Parse attributes caught by the $this->id_class_attr_catch_re expression * and return the HTML-formatted list of attributes. * * Currently supported attributes are .class and #id. * * In addition, this method also supports supplying a default Id value, * which will be used to populate the id attribute in case it was not * overridden. * @param string $tag_name * @param string $attr * @param mixed $defaultIdValue * @param array $classes * @return string */ protected function doExtraAttributes($tag_name, $attr, $defaultIdValue = null, $classes = array()) { if (empty($attr) && !$defaultIdValue && empty($classes)) return ""; // Split on components preg_match_all('/[#.a-z][-_:a-zA-Z0-9=]+/', $attr, $matches); $elements = $matches[0]; // Handle classes and IDs (only first ID taken into account) $attributes = array(); $id = false; foreach ($elements as $element) { if ($element[0] == '.') { $classes[] = substr($element, 1); } else if ($element[0] == '#') { if ($id === false) $id = substr($element, 1); } else if (strpos($element, '=') > 0) { $parts = explode('=', $element, 2); $attributes[] = $parts[0] . '="' . $parts[1] . '"'; } } if (!$id) $id = $defaultIdValue; // Compose attributes as string $attr_str = ""; if (!empty($id)) { $attr_str .= ' id="'.$this->encodeAttribute($id) .'"'; } if (!empty($classes)) { $attr_str .= ' class="'. implode(" ", $classes) . '"'; } if (!$this->no_markup && !empty($attributes)) { $attr_str .= ' '.implode(" ", $attributes); } return $attr_str; } /** * Strips link definitions from text, stores the URLs and titles in * hash references. * @param string $text * @return string */ protected function stripLinkDefinitions($text) { $less_than_tab = $this->tab_width - 1; // Link defs are in the form: ^[id]: url "optional title" $text = preg_replace_callback('{ ^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?: # id = $1 [ ]* \n? # maybe *one* newline [ ]* (?: <(.+?)> # url = $2 | (\S+?) # url = $3 ) [ ]* \n? # maybe one newline [ ]* (?: (?<=\s) # lookbehind for whitespace ["(] (.*?) # title = $4 [")] [ ]* )? # title is optional (?:[ ]* '.$this->id_class_attr_catch_re.' )? # $5 = extra id & class attr (?:\n+|\Z) }xm', array($this, '_stripLinkDefinitions_callback'), $text); return $text; } /** * Strip link definition callback * @param array $matches * @return string */ protected function _stripLinkDefinitions_callback($matches) { $link_id = strtolower($matches[1]); $url = $matches[2] == '' ? $matches[3] : $matches[2]; $this->urls[$link_id] = $url; $this->titles[$link_id] =& $matches[4]; $this->ref_attr[$link_id] = $this->doExtraAttributes("", $dummy =& $matches[5]); return ''; // String that will replace the block } /** * HTML block parser */ /** * Tags that are always treated as block tags * @var string */ protected $block_tags_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend|article|section|nav|aside|hgroup|header|footer|figcaption|figure'; /** * Tags treated as block tags only if the opening tag is alone on its line * @var string */ protected $context_block_tags_re = 'script|noscript|style|ins|del|iframe|object|source|track|param|math|svg|canvas|audio|video'; /** * Tags where markdown="1" default to span mode: * @var string */ protected $contain_span_tags_re = 'p|h[1-6]|li|dd|dt|td|th|legend|address'; /** * Tags which must not have their contents modified, no matter where * they appear * @var string */ protected $clean_tags_re = 'script|style|math|svg'; /** * Tags that do not need to be closed. * @var string */ protected $auto_close_tags_re = 'hr|img|param|source|track'; /** * Hashify HTML Blocks and "clean tags". * * We only want to do this for block-level HTML tags, such as headers, * lists, and tables. That's because we still want to wrap <p>s around * "paragraphs" that are wrapped in non-block-level tags, such as anchors, * phrase emphasis, and spans. The list of tags we're looking for is * hard-coded. * * This works by calling _HashHTMLBlocks_InMarkdown, which then calls * _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1" * attribute is found within a tag, _HashHTMLBlocks_InHTML calls back * _HashHTMLBlocks_InMarkdown to handle the Markdown syntax within the tag. * These two functions are calling each other. It's recursive! * @param string $text * @return string */ protected function hashHTMLBlocks($text) { if ($this->no_markup) { return $text; } // Call the HTML-in-Markdown hasher. list($text, ) = $this->_hashHTMLBlocks_inMarkdown($text); return $text; } /** * Parse markdown text, calling _HashHTMLBlocks_InHTML for block tags. * * * $indent is the number of space to be ignored when checking for code * blocks. This is important because if we don't take the indent into * account, something like this (which looks right) won't work as expected: * * <div> * <div markdown="1"> * Hello World. <-- Is this a Markdown code block or text? * </div> <-- Is this a Markdown code block or a real tag? * <div> * * If you don't like this, just don't indent the tag on which * you apply the markdown="1" attribute. * * * If $enclosing_tag_re is not empty, stops at the first unmatched closing * tag with that name. Nested tags supported. * * * If $span is true, text inside must treated as span. So any double * newline will be replaced by a single newline so that it does not create * paragraphs. * * Returns an array of that form: ( processed text , remaining text ) * * @param string $text * @param integer $indent * @param string $enclosing_tag_re * @param boolean $span * @return array */ protected function _hashHTMLBlocks_inMarkdown($text, $indent = 0, $enclosing_tag_re = '', $span = false) { if ($text === '') return array('', ''); // Regex to check for the presense of newlines around a block tag. $newline_before_re = '/(?:^\n?|\n\n)*$/'; $newline_after_re = '{ ^ # Start of text following the tag. (?>[ ]*<!--.*?-->)? # Optional comment. [ ]*\n # Must be followed by newline. }xs'; // Regex to match any tag. $block_tag_re = '{ ( # $2: Capture whole tag. </? # Any opening or closing tag. (?> # Tag name. ' . $this->block_tags_re . ' | ' . $this->context_block_tags_re . ' | ' . $this->clean_tags_re . ' | (?!\s)'.$enclosing_tag_re . ' ) (?: (?=[\s"\'/a-zA-Z0-9]) # Allowed characters after tag name. (?> ".*?" | # Double quotes (can contain `>`) \'.*?\' | # Single quotes (can contain `>`) .+? # Anything but quotes and `>`. )*? )? > # End of tag. | <!-- .*? --> # HTML Comment | <\?.*?\?> | <%.*?%> # Processing instruction | <!\[CDATA\[.*?\]\]> # CData Block ' . ( !$span ? ' # If not in span. | # Indented code block (?: ^[ ]*\n | ^ | \n[ ]*\n ) [ ]{' . ($indent + 4) . '}[^\n]* \n (?> (?: [ ]{' . ($indent + 4) . '}[^\n]* | [ ]* ) \n )* | # Fenced code block marker (?<= ^ | \n ) [ ]{0,' . ($indent + 3) . '}(?:~{3,}|`{3,}) [ ]* (?: \.?[-_:a-zA-Z0-9]+ )? # standalone class name [ ]* (?: ' . $this->id_class_attr_nocatch_re . ' )? # extra attributes [ ]* (?= \n ) ' : '' ) . ' # End (if not is span). | # Code span marker # Note, this regex needs to go after backtick fenced # code blocks but it should also be kept outside of the # "if not in span" condition adding backticks to the parser `+ ) }xs'; $depth = 0; // Current depth inside the tag tree. $parsed = ""; // Parsed text that will be returned. // Loop through every tag until we find the closing tag of the parent // or loop until reaching the end of text if no parent tag specified. do { // Split the text using the first $tag_match pattern found. // Text before pattern will be first in the array, text after // pattern will be at the end, and between will be any catches made // by the pattern. $parts = preg_split($block_tag_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE); // If in Markdown span mode, add a empty-string span-level hash // after each newline to prevent triggering any block element. if ($span) { $void = $this->hashPart("", ':'); $newline = "\n$void"; $parts[0] = $void . str_replace("\n", $newline, $parts[0]) . $void; } $parsed .= $parts[0]; // Text before current tag. // If end of $text has been reached. Stop loop. if (count($parts) < 3) { $text = ""; break; } $tag = $parts[1]; // Tag to handle. $text = $parts[2]; // Remaining text after current tag. $tag_re = preg_quote($tag); // For use in a regular expression. // Check for: Fenced code block marker. // Note: need to recheck the whole tag to disambiguate backtick // fences from code spans if (preg_match('{^\n?([ ]{0,' . ($indent + 3) . '})(~{3,}|`{3,})[ ]*(?:\.?[-_:a-zA-Z0-9]+)?[ ]*(?:' . $this->id_class_attr_nocatch_re . ')?[ ]*\n?$}', $tag, $capture)) { // Fenced code block marker: find matching end marker. $fence_indent = strlen($capture[1]); // use captured indent in re $fence_re = $capture[2]; // use captured fence in re if (preg_match('{^(?>.*\n)*?[ ]{' . ($fence_indent) . '}' . $fence_re . '[ ]*(?:\n|$)}', $text, $matches)) { // End marker found: pass text unchanged until marker. $parsed .= $tag . $matches[0]; $text = substr($text, strlen($matches[0])); } else { // No end marker: just skip it. $parsed .= $tag; } } // Check for: Indented code block. else if ($tag[0] == "\n" || $tag[0] == " ") { // Indented code block: pass it unchanged, will be handled // later. $parsed .= $tag; } // Check for: Code span marker // Note: need to check this after backtick fenced code blocks else if ($tag[0] == "`") { // Find corresponding end marker. $tag_re = preg_quote($tag); if (preg_match('{^(?>.+?|\n(?!\n))*?(?<!`)' . $tag_re . '(?!`)}', $text, $matches)) { // End marker found: pass text unchanged until marker. $parsed .= $tag . $matches[0]; $text = substr($text, strlen($matches[0])); } else { // Unmatched marker: just skip it. $parsed .= $tag; } } // Check for: Opening Block level tag or // Opening Context Block tag (like ins and del) // used as a block tag (tag is alone on it's line). else if (preg_match('{^<(?:' . $this->block_tags_re . ')\b}', $tag) || ( preg_match('{^<(?:' . $this->context_block_tags_re . ')\b}', $tag) && preg_match($newline_before_re, $parsed) && preg_match($newline_after_re, $text) ) ) { // Need to parse tag and following text using the HTML parser. list($block_text, $text) = $this->_hashHTMLBlocks_inHTML($tag . $text, "hashBlock", true); // Make sure it stays outside of any paragraph by adding newlines. $parsed .= "\n\n$block_text\n\n"; } // Check for: Clean tag (like script, math) // HTML Comments, processing instructions. else if (preg_match('{^<(?:' . $this->clean_tags_re . ')\b}', $tag) || $tag[1] == '!' || $tag[1] == '?') { // Need to parse tag and following text using the HTML parser. // (don't check for markdown attribute) list($block_text, $text) = $this->_hashHTMLBlocks_inHTML($tag . $text, "hashClean", false); $parsed .= $block_text; } // Check for: Tag with same name as enclosing tag. else if ($enclosing_tag_re !== '' && // Same name as enclosing tag. preg_match('{^</?(?:' . $enclosing_tag_re . ')\b}', $tag)) { // Increase/decrease nested tag count. if ($tag[1] == '/') $depth--; else if ($tag[strlen($tag)-2] != '/') $depth++; if ($depth < 0) { // Going out of parent element. Clean up and break so we // return to the calling function. $text = $tag . $text; break; } $parsed .= $tag; } else { $parsed .= $tag; } } while ($depth >= 0); return array($parsed, $text); } /** * Parse HTML, calling _HashHTMLBlocks_InMarkdown for block tags. * * * Calls $hash_method to convert any blocks. * * Stops when the first opening tag closes. * * $md_attr indicate if the use of the `markdown="1"` attribute is allowed. * (it is not inside clean tags) * * Returns an array of that form: ( processed text , remaining text ) * @param string $text * @param string $hash_method * @param string $md_attr * @return array */ protected function _hashHTMLBlocks_inHTML($text, $hash_method, $md_attr) { if ($text === '') return array('', ''); // Regex to match `markdown` attribute inside of a tag. $markdown_attr_re = ' { \s* # Eat whitespace before the `markdown` attribute markdown \s*=\s* (?> (["\']) # $1: quote delimiter (.*?) # $2: attribute value \1 # matching delimiter | ([^\s>]*) # $3: unquoted attribute value ) () # $4: make $3 always defined (avoid warnings) }xs'; // Regex to match any tag. $tag_re = '{ ( # $2: Capture whole tag. </? # Any opening or closing tag. [\w:$]+ # Tag name. (?: (?=[\s"\'/a-zA-Z0-9]) # Allowed characters after tag name. (?> ".*?" | # Double quotes (can contain `>`) \'.*?\' | # Single quotes (can contain `>`) .+? # Anything but quotes and `>`. )*? )? > # End of tag. | <!-- .*? --> # HTML Comment | <\?.*?\?> | <%.*?%> # Processing instruction | <!\[CDATA\[.*?\]\]> # CData Block ) }xs'; $original_text = $text; // Save original text in case of faliure. $depth = 0; // Current depth inside the tag tree. $block_text = ""; // Temporary text holder for current text. $parsed = ""; // Parsed text that will be returned. // Get the name of the starting tag. // (This pattern makes $base_tag_name_re safe without quoting.) if (preg_match('/^<([\w:$]*)\b/', $text, $matches)) $base_tag_name_re = $matches[1]; // Loop through every tag until we find the corresponding closing tag. do { // Split the text using the first $tag_match pattern found. // Text before pattern will be first in the array, text after // pattern will be at the end, and between will be any catches made // by the pattern. $parts = preg_split($tag_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE); if (count($parts) < 3) { // End of $text reached with unbalenced tag(s). // In that case, we return original text unchanged and pass the // first character as filtered to prevent an infinite loop in the // parent function. return array($original_text[0], substr($original_text, 1)); } $block_text .= $parts[0]; // Text before current tag. $tag = $parts[1]; // Tag to handle. $text = $parts[2]; // Remaining text after current tag. // Check for: Auto-close tag (like <hr/>) // Comments and Processing Instructions. if (preg_match('{^</?(?:' . $this->auto_close_tags_re . ')\b}', $tag) || $tag[1] == '!' || $tag[1] == '?') { // Just add the tag to the block as if it was text. $block_text .= $tag; } else { // Increase/decrease nested tag count. Only do so if // the tag's name match base tag's. if (preg_match('{^</?' . $base_tag_name_re . '\b}', $tag)) { if ($tag[1] == '/') $depth--; else if ($tag[strlen($tag)-2] != '/') $depth++; } // Check for `markdown="1"` attribute and handle it. if ($md_attr && preg_match($markdown_attr_re, $tag, $attr_m) && preg_match('/^1|block|span$/', $attr_m[2] . $attr_m[3])) { // Remove `markdown` attribute from opening tag. $tag = preg_replace($markdown_attr_re, '', $tag); // Check if text inside this tag must be parsed in span mode. $this->mode = $attr_m[2] . $attr_m[3]; $span_mode = $this->mode == 'span' || $this->mode != 'block' && preg_match('{^<(?:' . $this->contain_span_tags_re . ')\b}', $tag); // Calculate indent before tag. if (preg_match('/(?:^|\n)( *?)(?! ).*?$/', $block_text, $matches)) { $strlen = $this->utf8_strlen; $indent = $strlen($matches[1], 'UTF-8'); } else { $indent = 0; } // End preceding block with this tag. $block_text .= $tag; $parsed .= $this->$hash_method($block_text); // Get enclosing tag name for the ParseMarkdown function. // (This pattern makes $tag_name_re safe without quoting.) preg_match('/^<([\w:$]*)\b/', $tag, $matches); $tag_name_re = $matches[1]; // Parse the content using the HTML-in-Markdown parser. list ($block_text, $text) = $this->_hashHTMLBlocks_inMarkdown($text, $indent, $tag_name_re, $span_mode); // Outdent markdown text. if ($indent > 0) { $block_text = preg_replace("/^[ ]{1,$indent}/m", "", $block_text); } // Append tag content to parsed text. if (!$span_mode) $parsed .= "\n\n$block_text\n\n"; else $parsed .= "$block_text"; // Start over with a new block. $block_text = ""; } else $block_text .= $tag; } } while ($depth > 0); // Hash last block text that wasn't processed inside the loop. $parsed .= $this->$hash_method($block_text); return array($parsed, $text); } /** * Called whenever a tag must be hashed when a function inserts a "clean" tag * in $text, it passes through this function and is automaticaly escaped, * blocking invalid nested overlap. * @param string $text * @return string */ protected function hashClean($text) { return $this->hashPart($text, 'C'); } /** * Turn Markdown link shortcuts into XHTML <a> tags. * @param string $text * @return string */ protected function doAnchors($text) { if ($this->in_anchor) { return $text; } $this->in_anchor = true; // First, handle reference-style links: [link text] [id] $text = preg_replace_callback('{ ( # wrap whole match in $1 \[ (' . $this->nested_brackets_re . ') # link text = $2 \] [ ]? # one optional space (?:\n[ ]*)? # one optional newline followed by spaces \[ (.*?) # id = $3 \] ) }xs', array($this, '_doAnchors_reference_callback'), $text); // Next, inline-style links: [link text](url "optional title") $text = preg_replace_callback('{ ( # wrap whole match in $1 \[ (' . $this->nested_brackets_re . ') # link text = $2 \] \( # literal paren [ \n]* (?: <(.+?)> # href = $3 | (' . $this->nested_url_parenthesis_re . ') # href = $4 ) [ \n]* ( # $5 ([\'"]) # quote char = $6 (.*?) # Title = $7 \6 # matching quote [ \n]* # ignore any spaces/tabs between closing quote and ) )? # title is optional \) (?:[ ]? ' . $this->id_class_attr_catch_re . ' )? # $8 = id/class attributes ) }xs', array($this, '_doAnchors_inline_callback'), $text); // Last, handle reference-style shortcuts: [link text] // These must come last in case you've also got [link text][1] // or [link text](/foo) $text = preg_replace_callback('{ ( # wrap whole match in $1 \[ ([^\[\]]+) # link text = $2; can\'t contain [ or ] \] ) }xs', array($this, '_doAnchors_reference_callback'), $text); $this->in_anchor = false; return $text; } /** * Callback for reference anchors * @param array $matches * @return string */ protected function _doAnchors_reference_callback($matches) { $whole_match = $matches[1]; $link_text = $matches[2]; $link_id =& $matches[3]; if ($link_id == "") { // for shortcut links like [this][] or [this]. $link_id = $link_text; } // lower-case and turn embedded newlines into spaces $link_id = strtolower($link_id); $link_id = preg_replace('{[ ]?\n}', ' ', $link_id); if (isset($this->urls[$link_id])) { $url = $this->urls[$link_id]; $url = $this->encodeURLAttribute($url); $result = "<a href=\"$url\""; if ( isset( $this->titles[$link_id] ) ) { $title = $this->titles[$link_id]; $title = $this->encodeAttribute($title); $result .= " title=\"$title\""; } if (isset($this->ref_attr[$link_id])) $result .= $this->ref_attr[$link_id]; $link_text = $this->runSpanGamut($link_text); $result .= ">$link_text</a>"; $result = $this->hashPart($result); } else { $result = $whole_match; } return $result; } /** * Callback for inline anchors * @param array $matches * @return string */ protected function _doAnchors_inline_callback($matches) { $whole_match = $matches[1]; $link_text = $this->runSpanGamut($matches[2]); $url = $matches[3] == '' ? $matches[4] : $matches[3]; $title =& $matches[7]; $attr = $this->doExtraAttributes("a", $dummy =& $matches[8]); // if the URL was of the form <s p a c e s> it got caught by the HTML // tag parser and hashed. Need to reverse the process before using the URL. $unhashed = $this->unhash($url); if ($unhashed != $url) $url = preg_replace('/^<(.*)>$/', '\1', $unhashed); $url = $this->encodeURLAttribute($url); $result = "<a href=\"$url\""; if (isset($title)) { $title = $this->encodeAttribute($title); $result .= " title=\"$title\""; } $result .= $attr; $link_text = $this->runSpanGamut($link_text); $result .= ">$link_text</a>"; return $this->hashPart($result); } /** * Turn Markdown image shortcuts into <img> tags. * @param string $text * @return string */ protected function doImages($text) { // First, handle reference-style labeled images: ![alt text][id] $text = preg_replace_callback('{ ( # wrap whole match in $1 !\[ (' . $this->nested_brackets_re . ') # alt text = $2 \] [ ]? # one optional space (?:\n[ ]*)? # one optional newline followed by spaces \[ (.*?) # id = $3 \] ) }xs', array($this, '_doImages_reference_callback'), $text); // Next, handle inline images:  // Don't forget: encode * and _ $text = preg_replace_callback('{ ( # wrap whole match in $1 !\[ (' . $this->nested_brackets_re . ') # alt text = $2 \] \s? # One optional whitespace character \( # literal paren [ \n]* (?: <(\S*)> # src url = $3 | (' . $this->nested_url_parenthesis_re . ') # src url = $4 ) [ \n]* ( # $5 ([\'"]) # quote char = $6 (.*?) # title = $7 \6 # matching quote [ \n]* )? # title is optional \) (?:[ ]? ' . $this->id_class_attr_catch_re . ' )? # $8 = id/class attributes ) }xs', array($this, '_doImages_inline_callback'), $text); return $text; } /** * Callback for referenced images * @param array $matches * @return string */ protected function _doImages_reference_callback($matches) { $whole_match = $matches[1]; $alt_text = $matches[2]; $link_id = strtolower($matches[3]); if ($link_id == "") { $link_id = strtolower($alt_text); // for shortcut links like ![this][]. } $alt_text = $this->encodeAttribute($alt_text); if (isset($this->urls[$link_id])) { $url = $this->encodeURLAttribute($this->urls[$link_id]); $result = "<img src=\"$url\" alt=\"$alt_text\""; if (isset($this->titles[$link_id])) { $title = $this->titles[$link_id]; $title = $this->encodeAttribute($title); $result .= " title=\"$title\""; } if (isset($this->ref_attr[$link_id])) $result .= $this->ref_attr[$link_id]; $result .= $this->empty_element_suffix; $result = $this->hashPart($result); } else { // If there's no such link ID, leave intact: $result = $whole_match; } return $result; } /** * Callback for inline images * @param array $matches * @return string */ protected function _doImages_inline_callback($matches) { $whole_match = $matches[1]; $alt_text = $matches[2]; $url = $matches[3] == '' ? $matches[4] : $matches[3]; $title =& $matches[7]; $attr = $this->doExtraAttributes("img", $dummy =& $matches[8]); $alt_text = $this->encodeAttribute($alt_text); $url = $this->encodeURLAttribute($url); $result = "<img src=\"$url\" alt=\"$alt_text\""; if (isset($title)) { $title = $this->encodeAttribute($title); $result .= " title=\"$title\""; // $title already quoted } $result .= $attr; $result .= $this->empty_element_suffix; return $this->hashPart($result); } /** * Process markdown headers. Redefined to add ID and class attribute support. * @param string $text * @return string */ protected function doHeaders($text) { // Setext-style headers: // Header 1 {#header1} // ======== // // Header 2 {#header2 .class1 .class2} // -------- // $text = preg_replace_callback( '{ (^.+?) # $1: Header text (?:[ ]+ ' . $this->id_class_attr_catch_re . ' )? # $3 = id/class attributes [ ]*\n(=+|-+)[ ]*\n+ # $3: Header footer }mx', array($this, '_doHeaders_callback_setext'), $text); // atx-style headers: // # Header 1 {#header1} // ## Header 2 {#header2} // ## Header 2 with closing hashes ## {#header3.class1.class2} // ... // ###### Header 6 {.class2} // $text = preg_replace_callback('{ ^(\#{1,6}) # $1 = string of #\'s [ ]'.($this->hashtag_protection ? '+' : '*').' (.+?) # $2 = Header text [ ]* \#* # optional closing #\'s (not counted) (?:[ ]+ ' . $this->id_class_attr_catch_re . ' )? # $3 = id/class attributes [ ]* \n+ }xm', array($this, '_doHeaders_callback_atx'), $text); return $text; } /** * Callback for setext headers * @param array $matches * @return string */ protected function _doHeaders_callback_setext($matches) { if ($matches[3] == '-' && preg_match('{^- }', $matches[1])) { return $matches[0]; } $level = $matches[3][0] == '=' ? 1 : 2; $defaultId = is_callable($this->header_id_func) ? call_user_func($this->header_id_func, $matches[1]) : null; $attr = $this->doExtraAttributes("h$level", $dummy =& $matches[2], $defaultId); $block = "<h$level$attr>" . $this->runSpanGamut($matches[1]) . "</h$level>"; return "\n" . $this->hashBlock($block) . "\n\n"; } /** * Callback for atx headers * @param array $matches * @return string */ protected function _doHeaders_callback_atx($matches) { $level = strlen($matches[1]); $defaultId = is_callable($this->header_id_func) ? call_user_func($this->header_id_func, $matches[2]) : null; $attr = $this->doExtraAttributes("h$level", $dummy =& $matches[3], $defaultId); $block = "<h$level$attr>" . $this->runSpanGamut($matches[2]) . "</h$level>"; return "\n" . $this->hashBlock($block) . "\n\n"; } /** * Form HTML tables. * @param string $text * @return string */ protected function doTables($text) { $less_than_tab = $this->tab_width - 1; // Find tables with leading pipe. // // | Header 1 | Header 2 // | -------- | -------- // | Cell 1 | Cell 2 // | Cell 3 | Cell 4 $text = preg_replace_callback(' { ^ # Start of a line [ ]{0,' . $less_than_tab . '} # Allowed whitespace. [|] # Optional leading pipe (present) (.+) \n # $1: Header row (at least one pipe) [ ]{0,' . $less_than_tab . '} # Allowed whitespace. [|] ([ ]*[-:]+[-| :]*) \n # $2: Header underline ( # $3: Cells (?> [ ]* # Allowed whitespace. [|] .* \n # Row content. )* ) (?=\n|\Z) # Stop at final double newline. }xm', array($this, '_doTable_leadingPipe_callback'), $text); // Find tables without leading pipe. // // Header 1 | Header 2 // -------- | -------- // Cell 1 | Cell 2 // Cell 3 | Cell 4 $text = preg_replace_callback(' { ^ # Start of a line [ ]{0,' . $less_than_tab . '} # Allowed whitespace. (\S.*[|].*) \n # $1: Header row (at least one pipe) [ ]{0,' . $less_than_tab . '} # Allowed whitespace. ([-:]+[ ]*[|][-| :]*) \n # $2: Header underline ( # $3: Cells (?> .* [|] .* \n # Row content )* ) (?=\n|\Z) # Stop at final double newline. }xm', array($this, '_DoTable_callback'), $text); return $text; } /** * Callback for removing the leading pipe for each row * @param array $matches * @return string */ protected function _doTable_leadingPipe_callback($matches) { $head = $matches[1]; $underline = $matches[2]; $content = $matches[3]; $content = preg_replace('/^ *[|]/m', '', $content); return $this->_doTable_callback(array($matches[0], $head, $underline, $content)); } /** * Make the align attribute in a table * @param string $alignname * @return string */ protected function _doTable_makeAlignAttr($alignname) { if (empty($this->table_align_class_tmpl)) { return " align=\"$alignname\""; } $classname = str_replace('%%', $alignname, $this->table_align_class_tmpl); return " class=\"$classname\""; } /** * Calback for processing tables * @param array $matches * @return string */ protected function _doTable_callback($matches) { $head = $matches[1]; $underline = $matches[2]; $content = $matches[3]; // Remove any tailing pipes for each line. $head = preg_replace('/[|] *$/m', '', $head); $underline = preg_replace('/[|] *$/m', '', $underline); $content = preg_replace('/[|] *$/m', '', $content); // Reading alignement from header underline. $separators = preg_split('/ *[|] */', $underline); foreach ($separators as $n => $s) { if (preg_match('/^ *-+: *$/', $s)) $attr[$n] = $this->_doTable_makeAlignAttr('right'); else if (preg_match('/^ *:-+: *$/', $s)) $attr[$n] = $this->_doTable_makeAlignAttr('center'); else if (preg_match('/^ *:-+ *$/', $s)) $attr[$n] = $this->_doTable_makeAlignAttr('left'); else $attr[$n] = ''; } // Parsing span elements, including code spans, character escapes, // and inline HTML tags, so that pipes inside those gets ignored. $head = $this->parseSpan($head); $headers = preg_split('/ *[|] */', $head); $col_count = count($headers); $attr = array_pad($attr, $col_count, ''); // Write column headers. $text = "<table>\n"; $text .= "<thead>\n"; $text .= "<tr>\n"; foreach ($headers as $n => $header) $text .= " <th$attr[$n]>" . $this->runSpanGamut(trim($header)) . "</th>\n"; $text .= "</tr>\n"; $text .= "</thead>\n"; // Split content by row. $rows = explode("\n", trim($content, "\n")); $text .= "<tbody>\n"; foreach ($rows as $row) { // Parsing span elements, including code spans, character escapes, // and inline HTML tags, so that pipes inside those gets ignored. $row = $this->parseSpan($row); // Split row by cell. $row_cells = preg_split('/ *[|] */', $row, $col_count); $row_cells = array_pad($row_cells, $col_count, ''); $text .= "<tr>\n"; foreach ($row_cells as $n => $cell) $text .= " <td$attr[$n]>" . $this->runSpanGamut(trim($cell)) . "</td>\n"; $text .= "</tr>\n"; } $text .= "</tbody>\n"; $text .= "</table>"; return $this->hashBlock($text) . "\n"; } /** * Form HTML definition lists. * @param string $text * @return string */ protected function doDefLists($text) { $less_than_tab = $this->tab_width - 1; // Re-usable pattern to match any entire dl list: $whole_list_re = '(?> ( # $1 = whole list ( # $2 [ ]{0,' . $less_than_tab . '} ((?>.*\S.*\n)+) # $3 = defined term \n? [ ]{0,' . $less_than_tab . '}:[ ]+ # colon starting definition ) (?s:.+?) ( # $4 \z | \n{2,} (?=\S) (?! # Negative lookahead for another term [ ]{0,' . $less_than_tab . '} (?: \S.*\n )+? # defined term \n? [ ]{0,' . $less_than_tab . '}:[ ]+ # colon starting definition ) (?! # Negative lookahead for another definition [ ]{0,' . $less_than_tab . '}:[ ]+ # colon starting definition ) ) ) )'; // mx $text = preg_replace_callback('{ (?>\A\n?|(?<=\n\n)) ' . $whole_list_re . ' }mx', array($this, '_doDefLists_callback'), $text); return $text; } /** * Callback for processing definition lists * @param array $matches * @return string */ protected function _doDefLists_callback($matches) { // Re-usable patterns to match list item bullets and number markers: $list = $matches[1]; // Turn double returns into triple returns, so that we can make a // paragraph for the last item in a list, if necessary: $result = trim($this->processDefListItems($list)); $result = "<dl>\n" . $result . "\n</dl>"; return $this->hashBlock($result) . "\n\n"; } /** * Process the contents of a single definition list, splitting it * into individual term and definition list items. * @param string $list_str * @return string */ protected function processDefListItems($list_str) { $less_than_tab = $this->tab_width - 1; // Trim trailing blank lines: $list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str); // Process definition terms. $list_str = preg_replace_callback('{ (?>\A\n?|\n\n+) # leading line ( # definition terms = $1 [ ]{0,' . $less_than_tab . '} # leading whitespace (?!\:[ ]|[ ]) # negative lookahead for a definition # mark (colon) or more whitespace. (?> \S.* \n)+? # actual term (not whitespace). ) (?=\n?[ ]{0,3}:[ ]) # lookahead for following line feed # with a definition mark. }xm', array($this, '_processDefListItems_callback_dt'), $list_str); // Process actual definitions. $list_str = preg_replace_callback('{ \n(\n+)? # leading line = $1 ( # marker space = $2 [ ]{0,' . $less_than_tab . '} # whitespace before colon \:[ ]+ # definition mark (colon) ) ((?s:.+?)) # definition text = $3 (?= \n+ # stop at next definition mark, (?: # next term or end of text [ ]{0,' . $less_than_tab . '} \:[ ] | <dt> | \z ) ) }xm', array($this, '_processDefListItems_callback_dd'), $list_str); return $list_str; } /** * Callback for <dt> elements in definition lists * @param array $matches * @return string */ protected function _processDefListItems_callback_dt($matches) { $terms = explode("\n", trim($matches[1])); $text = ''; foreach ($terms as $term) { $term = $this->runSpanGamut(trim($term)); $text .= "\n<dt>" . $term . "</dt>"; } return $text . "\n"; } /** * Callback for <dd> elements in definition lists * @param array $matches * @return string */ protected function _processDefListItems_callback_dd($matches) { $leading_line = $matches[1]; $marker_space = $matches[2]; $def = $matches[3]; if ($leading_line || preg_match('/\n{2,}/', $def)) { // Replace marker with the appropriate whitespace indentation $def = str_repeat(' ', strlen($marker_space)) . $def; $def = $this->runBlockGamut($this->outdent($def . "\n\n")); $def = "\n". $def ."\n"; } else { $def = rtrim($def); $def = $this->runSpanGamut($this->outdent($def)); } return "\n<dd>" . $def . "</dd>\n"; } /** * Adding the fenced code block syntax to regular Markdown: * * ~~~ * Code block * ~~~ * * @param string $text * @return string */ protected function doFencedCodeBlocks($text) { $less_than_tab = $this->tab_width; $text = preg_replace_callback('{ (?:\n|\A) # 1: Opening marker ( (?:~{3,}|`{3,}) # 3 or more tildes/backticks. ) [ ]* (?: \.?([-_:a-zA-Z0-9]+) # 2: standalone class name )? [ ]* (?: ' . $this->id_class_attr_catch_re . ' # 3: Extra attributes )? [ ]* \n # Whitespace and newline following marker. # 4: Content ( (?> (?!\1 [ ]* \n) # Not a closing marker. .*\n+ )+ ) # Closing marker. \1 [ ]* (?= \n ) }xm', array($this, '_doFencedCodeBlocks_callback'), $text); return $text; } /** * Callback to process fenced code blocks * @param array $matches * @return string */ protected function _doFencedCodeBlocks_callback($matches) { $classname =& $matches[2]; $attrs =& $matches[3]; $codeblock = $matches[4]; if ($this->code_block_content_func) { $codeblock = call_user_func($this->code_block_content_func, $codeblock, $classname); } else { $codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES); } $codeblock = preg_replace_callback('/^\n+/', array($this, '_doFencedCodeBlocks_newlines'), $codeblock); $classes = array(); if ($classname != "") { if ($classname[0] == '.') $classname = substr($classname, 1); $classes[] = $this->code_class_prefix . $classname; } $attr_str = $this->doExtraAttributes($this->code_attr_on_pre ? "pre" : "code", $attrs, null, $classes); $pre_attr_str = $this->code_attr_on_pre ? $attr_str : ''; $code_attr_str = $this->code_attr_on_pre ? '' : $attr_str; $codeblock = "<pre$pre_attr_str><code$code_attr_str>$codeblock</code></pre>"; return "\n\n".$this->hashBlock($codeblock)."\n\n"; } /** * Replace new lines in fenced code blocks * @param array $matches * @return string */ protected function _doFencedCodeBlocks_newlines($matches) { return str_repeat("<br$this->empty_element_suffix", strlen($matches[0])); } /** * Redefining emphasis markers so that emphasis by underscore does not * work in the middle of a word. * @var array */ protected $em_relist = array( '' => '(?:(?<!\*)\*(?!\*)|(?<![a-zA-Z0-9_])_(?!_))(?![\.,:;]?\s)', '*' => '(?<![\s*])\*(?!\*)', '_' => '(?<![\s_])_(?![a-zA-Z0-9_])', ); protected $strong_relist = array( '' => '(?:(?<!\*)\*\*(?!\*)|(?<![a-zA-Z0-9_])__(?!_))(?![\.,:;]?\s)', '**' => '(?<![\s*])\*\*(?!\*)', '__' => '(?<![\s_])__(?![a-zA-Z0-9_])', ); protected $em_strong_relist = array( '' => '(?:(?<!\*)\*\*\*(?!\*)|(?<![a-zA-Z0-9_])___(?!_))(?![\.,:;]?\s)', '***' => '(?<![\s*])\*\*\*(?!\*)', '___' => '(?<![\s_])___(?![a-zA-Z0-9_])', ); /** * Parse text into paragraphs * @param string $text String to process in paragraphs * @param boolean $wrap_in_p Whether paragraphs should be wrapped in <p> tags * @return string HTML output */ protected function formParagraphs($text, $wrap_in_p = true) { // Strip leading and trailing lines: $text = preg_replace('/\A\n+|\n+\z/', '', $text); $grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY); // Wrap <p> tags and unhashify HTML blocks foreach ($grafs as $key => $value) { $value = trim($this->runSpanGamut($value)); // Check if this should be enclosed in a paragraph. // Clean tag hashes & block tag hashes are left alone. $is_p = $wrap_in_p && !preg_match('/^B\x1A[0-9]+B|^C\x1A[0-9]+C$/', $value); if ($is_p) { $value = "<p>$value</p>"; } $grafs[$key] = $value; } // Join grafs in one text, then unhash HTML tags. $text = implode("\n\n", $grafs); // Finish by removing any tag hashes still present in $text. $text = $this->unhash($text); return $text; } /** * Footnotes - Strips link definitions from text, stores the URLs and * titles in hash references. * @param string $text * @return string */ protected function stripFootnotes($text) { $less_than_tab = $this->tab_width - 1; // Link defs are in the form: [^id]: url "optional title" $text = preg_replace_callback('{ ^[ ]{0,' . $less_than_tab . '}\[\^(.+?)\][ ]?: # note_id = $1 [ ]* \n? # maybe *one* newline ( # text = $2 (no blank lines allowed) (?: .+ # actual text | \n # newlines but (?!\[.+?\][ ]?:\s)# negative lookahead for footnote or link definition marker. (?!\n+[ ]{0,3}\S)# ensure line is not blank and followed # by non-indented content )* ) }xm', array($this, '_stripFootnotes_callback'), $text); return $text; } /** * Callback for stripping footnotes * @param array $matches * @return string */ protected function _stripFootnotes_callback($matches) { $note_id = $this->fn_id_prefix . $matches[1]; $this->footnotes[$note_id] = $this->outdent($matches[2]); return ''; // String that will replace the block } /** * Replace footnote references in $text [^id] with a special text-token * which will be replaced by the actual footnote marker in appendFootnotes. * @param string $text * @return string */ protected function doFootnotes($text) { if (!$this->in_anchor) { $text = preg_replace('{\[\^(.+?)\]}', "F\x1Afn:\\1\x1A:", $text); } return $text; } /** * Append footnote list to text * @param string $text * @return string */ protected function appendFootnotes($text) { $text = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}', array($this, '_appendFootnotes_callback'), $text); if (!empty($this->footnotes_ordered)) { $text .= "\n\n"; $text .= "<div class=\"footnotes\" role=\"doc-endnotes\">\n"; $text .= "<hr" . $this->empty_element_suffix . "\n"; $text .= "<ol>\n\n"; $attr = ""; if ($this->fn_backlink_class != "") { $class = $this->fn_backlink_class; $class = $this->encodeAttribute($class); $attr .= " class=\"$class\""; } if ($this->fn_backlink_title != "") { $title = $this->fn_backlink_title; $title = $this->encodeAttribute($title); $attr .= " title=\"$title\""; $attr .= " aria-label=\"$title\""; } $attr .= " role=\"doc-backlink\""; $backlink_text = $this->fn_backlink_html; $num = 0; while (!empty($this->footnotes_ordered)) { $footnote = reset($this->footnotes_ordered); $note_id = key($this->footnotes_ordered); unset($this->footnotes_ordered[$note_id]); $ref_count = $this->footnotes_ref_count[$note_id]; unset($this->footnotes_ref_count[$note_id]); unset($this->footnotes[$note_id]); $footnote .= "\n"; // Need to append newline before parsing. $footnote = $this->runBlockGamut("$footnote\n"); $footnote = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}', array($this, '_appendFootnotes_callback'), $footnote); $attr = str_replace("%%", ++$num, $attr); $note_id = $this->encodeAttribute($note_id); // Prepare backlink, multiple backlinks if multiple references $backlink = "<a href=\"#fnref:$note_id\"$attr>$backlink_text</a>"; for ($ref_num = 2; $ref_num <= $ref_count; ++$ref_num) { $backlink .= " <a href=\"#fnref$ref_num:$note_id\"$attr>$backlink_text</a>"; } // Add backlink to last paragraph; create new paragraph if needed. if (preg_match('{</p>$}', $footnote)) { $footnote = substr($footnote, 0, -4) . " $backlink</p>"; } else { $footnote .= "\n\n<p>$backlink</p>"; } $text .= "<li id=\"fn:$note_id\" role=\"doc-endnote\">\n"; $text .= $footnote . "\n"; $text .= "</li>\n\n"; } $text .= "</ol>\n"; $text .= "</div>"; } return $text; } /** * Callback for appending footnotes * @param array $matches * @return string */ protected function _appendFootnotes_callback($matches) { $node_id = $this->fn_id_prefix . $matches[1]; // Create footnote marker only if it has a corresponding footnote *and* // the footnote hasn't been used by another marker. if (isset($this->footnotes[$node_id])) { $num =& $this->footnotes_numbers[$node_id]; if (!isset($num)) { // Transfer footnote content to the ordered list and give it its // number $this->footnotes_ordered[$node_id] = $this->footnotes[$node_id]; $this->footnotes_ref_count[$node_id] = 1; $num = $this->footnote_counter++; $ref_count_mark = ''; } else { $ref_count_mark = $this->footnotes_ref_count[$node_id] += 1; } $attr = ""; if ($this->fn_link_class != "") { $class = $this->fn_link_class; $class = $this->encodeAttribute($class); $attr .= " class=\"$class\""; } if ($this->fn_link_title != "") { $title = $this->fn_link_title; $title = $this->encodeAttribute($title); $attr .= " title=\"$title\""; } $attr .= " role=\"doc-noteref\""; $attr = str_replace("%%", $num, $attr); $node_id = $this->encodeAttribute($node_id); return "<sup id=\"fnref$ref_count_mark:$node_id\">". "<a href=\"#fn:$node_id\"$attr>$num</a>". "</sup>"; } return "[^" . $matches[1] . "]"; } /** * Abbreviations - strips abbreviations from text, stores titles in hash * references. * @param string $text * @return string */ protected function stripAbbreviations($text) { $less_than_tab = $this->tab_width - 1; // Link defs are in the form: [id]*: url "optional title" $text = preg_replace_callback('{ ^[ ]{0,' . $less_than_tab . '}\*\[(.+?)\][ ]?: # abbr_id = $1 (.*) # text = $2 (no blank lines allowed) }xm', array($this, '_stripAbbreviations_callback'), $text); return $text; } /** * Callback for stripping abbreviations * @param array $matches * @return string */ protected function _stripAbbreviations_callback($matches) { $abbr_word = $matches[1]; $abbr_desc = $matches[2]; if ($this->abbr_word_re) { $this->abbr_word_re .= '|'; } $this->abbr_word_re .= preg_quote($abbr_word); $this->abbr_desciptions[$abbr_word] = trim($abbr_desc); return ''; // String that will replace the block } /** * Find defined abbreviations in text and wrap them in <abbr> elements. * @param string $text * @return string */ protected function doAbbreviations($text) { if ($this->abbr_word_re) { // cannot use the /x modifier because abbr_word_re may // contain significant spaces: $text = preg_replace_callback('{' . '(?<![\w\x1A])' . '(?:' . $this->abbr_word_re . ')' . '(?![\w\x1A])' . '}', array($this, '_doAbbreviations_callback'), $text); } return $text; } /** * Callback for processing abbreviations * @param array $matches * @return string */ protected function _doAbbreviations_callback($matches) { $abbr = $matches[0]; if (isset($this->abbr_desciptions[$abbr])) { $desc = $this->abbr_desciptions[$abbr]; if (empty($desc)) { return $this->hashPart("<abbr>$abbr</abbr>"); } else { $desc = $this->encodeAttribute($desc); return $this->hashPart("<abbr title=\"$desc\">$abbr</abbr>"); } } else { return $matches[0]; } } }
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