/includes/smarty/plugins/modifier.markdown.php
PHP | 1989 lines | 1166 code | 244 blank | 579 comment | 93 complexity | 2b572ac47f5b477487bf051f3fbbd018 MD5 | raw file
Possible License(s): Apache-2.0, MPL-2.0-no-copyleft-exception
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- <?php
- #
- # PHP Markdown Extra - A text-to-HTML conversion tool for web writers
- #
- # Copyright (c) 2004-2005 Michel Fortin
- # <http://www.michelf.com/projects/php-markdown/>
- #
- # Based on Markdown
- # Copyright (c) 2004-2005 John Gruber
- # <http://daringfireball.net/projects/markdown/>
- #
- global $MarkdownPHPVersion, $MarkdownSyntaxVersion,
- $md_empty_element_suffix, $md_tab_width,
- $md_nested_brackets_depth, $md_nested_brackets,
- $md_escape_table, $md_backslash_escape_table,
- $md_list_level;
- $MarkdownPHPVersion = 'Extra 1.0'; # Mon 5 Sep 2005
- $MarkdownSyntaxVersion = '1.0.1'; # Sun 12 Dec 2004
- #
- # Global default settings:
- #
- $md_empty_element_suffix = " />"; # Change to ">" for HTML output
- $md_tab_width = 4;
- #
- # WordPress settings:
- #
- $md_wp_posts = true; # Set to false to remove Markdown from posts.
- $md_wp_comments = true; # Set to false to remove Markdown from comments.
- # -- WordPress Plugin Interface -----------------------------------------------
- /*
- Plugin Name: PHP Markdown Extra
- Plugin URI: http://www.michelf.com/projects/php-markdown/
- Description: <a href="http://daringfireball.net/projects/markdown/syntax">Markdown syntax</a> allows you to write using an easy-to-read, easy-to-write plain text format. Based on the original Perl version by <a href="http://daringfireball.net/">John Gruber</a>. <a href="http://www.michelf.com/projects/php-markdown/">More...</a>
- Version: Extra 1.0
- Author: Michel Fortin
- Author URI: http://www.michelf.com/
- */
- if (isset($wp_version)) {
- # More details about how it works here:
- # <http://www.michelf.com/weblog/2005/wordpress-text-flow-vs-markdown/>
-
- # Post content and excerpts
- if ($md_wp_posts) {
- remove_filter('the_content', 'wpautop');
- remove_filter('the_excerpt', 'wpautop');
- add_filter('the_content', 'Markdown', 6);
- add_filter('get_the_excerpt', 'Markdown', 6);
- add_filter('get_the_excerpt', 'trim', 7);
- add_filter('the_excerpt', 'md_add_p');
- add_filter('the_excerpt_rss', 'md_strip_p');
-
- remove_filter('content_save_pre', 'balanceTags', 50);
- remove_filter('excerpt_save_pre', 'balanceTags', 50);
- add_filter('the_content', 'balanceTags', 50);
- add_filter('get_the_excerpt', 'balanceTags', 9);
-
- function md_add_p($text) {
- if (strlen($text) == 0) return;
- if (strcasecmp(substr($text, -3), '<p>') == 0) return $text;
- return '<p>'.$text.'</p>';
- }
- function md_strip_p($t) { return preg_replace('{</?[pP]>}', '', $t); }
- }
-
- # Comments
- if ($md_wp_comments) {
- remove_filter('comment_text', 'wpautop');
- remove_filter('comment_text', 'make_clickable');
- add_filter('pre_comment_content', 'Markdown', 6);
- add_filter('pre_comment_content', 'md_hide_tags', 8);
- add_filter('pre_comment_content', 'md_show_tags', 12);
- add_filter('get_comment_text', 'Markdown', 6);
- add_filter('get_comment_excerpt', 'Markdown', 6);
- add_filter('get_comment_excerpt', 'md_strip_p', 7);
-
- global $md_hidden_tags;
- $md_hidden_tags = array(
- '<p>' => md5('<p>'), '</p>' => md5('</p>'),
- '<pre>' => md5('<pre>'), '</pre>'=> md5('</pre>'),
- '<ol>' => md5('<ol>'), '</ol>' => md5('</ol>'),
- '<ul>' => md5('<ul>'), '</ul>' => md5('</ul>'),
- '<li>' => md5('<li>'), '</li>' => md5('</li>'),
- );
-
- function md_hide_tags($text) {
- global $md_hidden_tags;
- return str_replace(array_keys($md_hidden_tags),
- array_values($md_hidden_tags), $text);
- }
- function md_show_tags($text) {
- global $md_hidden_tags;
- return str_replace(array_values($md_hidden_tags),
- array_keys($md_hidden_tags), $text);
- }
- }
- }
- # -- bBlog Plugin Info --------------------------------------------------------
- function identify_modifier_markdown() {
- global $MarkdownPHPVersion;
- return array(
- 'name' => 'markdown',
- 'type' => 'modifier',
- 'nicename' => 'PHP Markdown Extra',
- 'description' => 'A text-to-HTML conversion tool for web writers',
- 'authors' => 'Michel Fortin and John Gruber',
- 'licence' => 'GPL',
- 'version' => $MarkdownPHPVersion,
- 'help' => '<a href="http://daringfireball.net/projects/markdown/syntax">Markdown syntax</a> allows you to write using an easy-to-read, easy-to-write plain text format. Based on the original Perl version by <a href="http://daringfireball.net/">John Gruber</a>. <a href="http://www.michelf.com/projects/php-markdown/">More...</a>'
- );
- }
- # -- Smarty Modifier Interface ------------------------------------------------
- function smarty_modifier_markdown($text) {
- return Markdown($text);
- }
- # -- Textile Compatibility Mode -----------------------------------------------
- # Rename this file to "classTextile.php" and it can replace Textile anywhere.
- if (strcasecmp(substr(__FILE__, -16), "classTextile.php") == 0) {
- # Try to include PHP SmartyPants. Should be in the same directory.
- @include_once 'smartypants.php';
- # Fake Textile class. It calls Markdown instead.
- class Textile {
- function TextileThis($text, $lite='', $encode='', $noimage='', $strict='') {
- if ($lite == '' && $encode == '') $text = Markdown($text);
- if (function_exists('SmartyPants')) $text = SmartyPants($text);
- return $text;
- }
- }
- }
- #
- # Globals:
- #
- # Regex to match balanced [brackets].
- # Needed to insert a maximum bracked depth while converting to PHP.
- $md_nested_brackets_depth = 6;
- $md_nested_brackets =
- str_repeat('(?>[^\[\]]+|\[', $md_nested_brackets_depth).
- str_repeat('\])*', $md_nested_brackets_depth);
- # Table of hash values for escaped characters:
- $md_escape_table = array(
- "\\" => md5("\\"),
- "`" => md5("`"),
- "*" => md5("*"),
- "_" => md5("_"),
- "{" => md5("{"),
- "}" => md5("}"),
- "[" => md5("["),
- "]" => md5("]"),
- "(" => md5("("),
- ")" => md5(")"),
- ">" => md5(">"),
- "#" => md5("#"),
- "+" => md5("+"),
- "-" => md5("-"),
- "." => md5("."),
- "!" => md5("!"),
- ":" => md5(":"),
- "|" => md5("|"),
- );
- # Create an identical table but for escaped characters.
- $md_backslash_escape_table;
- foreach ($md_escape_table as $key => $char)
- $md_backslash_escape_table["\\$key"] = $char;
- function Markdown($text) {
- #
- # Main function. The order in which other subs are called here is
- # essential. Link and image substitutions need to happen before
- # _EscapeSpecialCharsWithinTagAttributes(), so that any *'s or _'s in the <a>
- # and <img> tags get encoded.
- #
- # Clear the global hashes. If we don't clear these, you get conflicts
- # from other articles when generating a page which contains more than
- # one article (e.g. an index page that shows the N most recent
- # articles):
- global $md_urls, $md_titles, $md_html_blocks, $md_html_hashes;
- $md_urls = array();
- $md_titles = array();
- $md_html_blocks = array();
- $md_html_hashes = array();
- # Standardize line endings:
- # DOS to Unix and Mac to Unix
- $text = str_replace(array("\r\n", "\r"), "\n", $text);
- # Make sure $text ends with a couple of newlines:
- $text .= "\n\n";
- # Convert all tabs to spaces.
- $text = _Detab($text);
- # Turn block-level HTML blocks into hash entries
- $text = _HashHTMLBlocks($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 /[ \t]*\n+/ .
- $text = preg_replace('/^[ \t]+$/m', '', $text);
- # Strip link definitions, store in hashes.
- $text = _StripLinkDefinitions($text);
- $text = _RunBlockGamut($text, FALSE);
- $text = _UnescapeSpecialChars($text);
- return $text . "\n";
- }
- function _StripLinkDefinitions($text) {
- #
- # Strips link definitions from text, stores the URLs and titles in
- # hash references.
- #
- global $md_tab_width;
- $less_than_tab = $md_tab_width - 1;
- # Link defs are in the form: ^[id]: url "optional title"
- $text = preg_replace_callback('{
- ^[ ]{0,'.$less_than_tab.'}\[(.+)\]: # id = $1
- [ \t]*
- \n? # maybe *one* newline
- [ \t]*
- <?(\S+?)>? # url = $2
- [ \t]*
- \n? # maybe one newline
- [ \t]*
- (?:
- (?<=\s) # lookbehind for whitespace
- ["(]
- (.+?) # title = $3
- [")]
- [ \t]*
- )? # title is optional
- (?:\n+|\Z)
- }xm',
- '_StripLinkDefinitions_callback',
- $text);
- return $text;
- }
- function _StripLinkDefinitions_callback($matches) {
- global $md_urls, $md_titles;
- $link_id = strtolower($matches[1]);
- $md_urls[$link_id] = _EncodeAmpsAndAngles($matches[2]);
- if (isset($matches[3]))
- $md_titles[$link_id] = str_replace('"', '"', $matches[3]);
- return ''; # String that will replace the block
- }
- function _HashHTMLBlocks($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!
- #
- global $block_tags, $context_block_tags, $contain_span_tags,
- $clean_tags, $auto_close_tags;
-
- # Tags that are always treated as block tags:
- $block_tags = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|'.
- 'form|fieldset|iframe|hr|legend';
-
- # Tags treated as block tags only if the opening tag is alone on it's line:
- $context_block_tags = 'script|noscript|math|ins|del';
-
- # Tags where markdown="1" default to span mode:
- $contain_span_tags = 'p|h[1-6]|li|dd|dt|td|th|legend';
-
- # Tags which must not have their contents modified, no matter where
- # they appear:
- $clean_tags = 'script|math';
-
- # Tags that do not need to be closed.
- $auto_close_tags = 'hr|img';
-
- # Regex to match any tag.
- global $tag_match;
- $tag_match =
- '{
- ( # $2: Capture hole tag.
- </? # Any opening or closing tag.
- [\w:$]+ # Tag name.
- \s* # Whitespace.
- (?:
- ".*?" | # Double quotes (can contain `>`)
- \'.*?\' | # Single quotes (can contain `>`)
- .+? # Anything but quotes and `>`.
- )*?
- > # End of tag.
- |
- <!-- .*? --> # HTML Comment
- |
- <\? .*? \?> # Processing instruction
- |
- <!\[CDATA\[.*?\]\]> # CData Block
- )
- }xs';
-
- #
- # Call the HTML-in-Markdown hasher.
- #
- list($text, ) = _HashHTMLBlocks_InMarkdown($text);
-
- return $text;
- }
- function _HashHTMLBlocks_InMarkdown($text, $indent = 0,
- $enclosing_tag = '', $md_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 is not empty, stops at the first unmatched closing
- # tag with that name. Nested tags supported.
- #
- # * If $md_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 )
- #
- global $block_tags, $context_block_tags, $clean_tags, $auto_close_tags,
- $tag_match;
-
- if ($text === '') return array('', '');
- # Regex to check for the presense of newlines around a block tag.
- $newline_match_before = "/(?:^\n?|\n\n) *$/";
- $newline_match_after =
- '{
- ^ # Start of text following the tag.
- (?:[ ]*<!--.*?-->)? # Optional comment.
- [ ]*\n # Must be followed by newline.
- }xs';
-
- # Regex to match any tag.
- $block_tag_match =
- '{
- ( # $2: Capture hole tag.
- </? # Any opening or closing tag.
- (?: # Tag name.
- '.$block_tags.' |
- '.$context_block_tags.' |
- '.$clean_tags.' |
- (?!\s)'.$enclosing_tag.'
- )
- \s* # Whitespace.
- (?:
- ".*?" | # Double quotes (can contain `>`)
- \'.*?\' | # Single quotes (can contain `>`)
- .+? # Anything but quotes and `>`.
- )*?
- > # End of tag.
- |
- <!-- .*? --> # HTML Comment
- |
- <\? .*? \?> # Processing instruction
- |
- <!\[CDATA\[.*?\]\]> # CData Block
- )
- }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_match, $text, 2,
- PREG_SPLIT_DELIM_CAPTURE);
-
- # If in Markdown span mode, replace any multiple newlines that would
- # trigger a new paragraph.
- if ($md_span) {
- $parts[0] = preg_replace('/\n\n/', "\n", $parts[0]);
- }
-
- $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 = $parts[2]; # Remaining text after current tag.
-
- #
- # Check for: Tag inside code block or span
- #
- if (# Find current paragraph
- preg_match('/(?>^\n?|\n\n)((?>.\n?)+?)$/', $parsed, $matches) &&
- (
- # Then match in it either a code block...
- preg_match('/^ {'.($indent+4).'}.*(?>\n {'.($indent+4).'}.*)*'.
- '(?!\n)$/', $matches[1], $x) ||
- # ...or unbalenced code span markers. (the regex matches balenced)
- !preg_match('/^(?>[^`]+|(`+)(?>[^`]+|(?!\1[^`])`)*?\1(?!`))*$/s',
- $matches[1])
- ))
- {
- # Tag is in code block or span and may not be a tag at all. So we
- # simply skip the first char (should be a `<`).
- $parsed .= $tag{0};
- $text = substr($tag, 1) . $text; # Put back $tag minus first char.
- }
- #
- # Check for: Opening Block level tag or
- # Opening Content Block tag (like ins and del)
- # used as a block tag (tag is alone on it's line).
- #
- else if (preg_match("{^<(?:$block_tags)\b}", $tag) ||
- ( preg_match("{^<(?:$context_block_tags)\b}", $tag) &&
- preg_match($newline_match_before, $parsed) &&
- preg_match($newline_match_after, $text) )
- )
- {
- # Need to parse tag and following text using the HTML parser.
- list($block_text, $text) =
- _HashHTMLBlocks_InHTML($tag . $text,
- "_HashHTMLBlocks_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("{^<(?:$clean_tags)\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, $text) =
- _HashHTMLBlocks_InHTML($tag . $text,
- "_HashHTMLBlocks_HashClean", FALSE);
-
- $parsed .= $block_text;
- }
- #
- # Check for: Tag with same name as enclosing tag.
- #
- else if ($enclosing_tag !== '' &&
- # Same name as enclosing tag.
- preg_match("{^</?(?:$enclosing_tag)\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, $text);
- }
- function _HashHTMLBlocks_InHTML($text, $hash_function, $md_attr) {
- #
- # Parse HTML, calling _HashHTMLBlocks_InMarkdown for block tags.
- #
- # * Calls $hash_function 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 )
- #
- global $auto_close_tags, $contain_span_tags, $tag_match;
-
- if ($text === '') return array('', '');
-
- # Regex to match `markdown` attribute inside of a tag.
- $markdown_attr_match = '
- {
- \s* # Eat whitespace before the `markdown` attribute
- markdown
- \s*=\s*
- (["\']) # $1: quote delimiter
- (.*?) # $2: attribute value
- \1 # matching delimiter
- }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.
- $parsed = ""; # Parsed text that will be returned.
- #
- # Get the name of the starting tag.
- #
- if (preg_match("/^<([\w:$]*)\b/", $text, $matches))
- $base_tag_name = $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_match, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
-
- if (count($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 = $parts[2]; # Remaining text after current tag.
-
- #
- # Check for: Auto-close tag (like <hr/>)
- # Comments and Processing Instructions.
- #
- if (preg_match("{^</?(?:$auto_close_tags)\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\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_match, $tag, $attr_matches) &&
- preg_match('/^(?:1|block|span)$/', $attr_matches[2]))
- {
- # Remove `markdown` attribute from opening tag.
- $tag = preg_replace($markdown_attr_match, '', $tag);
-
- # Check if text inside this tag must be parsed in span mode.
- $md_mode = $attr_matches[2];
- $span_mode = $md_mode == 'span' || $md_mode != 'block' &&
- preg_match("{^<(?:$contain_span_tags)\b}", $tag);
-
- # Calculate indent before tag.
- preg_match('/(?:^|\n)( *?)(?! ).*?$/', $block_text, $matches);
- $indent = strlen($matches[1]);
-
- # End preceding block with this tag.
- $block_text .= $tag;
- $parsed .= $hash_function($block_text, $span_mode);
-
- # Get enclosing tag name for the ParseMarkdown function.
- preg_match('/^<([\w:$]*)\b/', $tag, $matches);
- $tag_name = $matches[1];
-
- # Parse the content using the HTML-in-Markdown parser.
- list ($block_text, $text)
- = _HashHTMLBlocks_InMarkdown($text, $indent,
- $tag_name, $span_mode);
-
- # Outdent markdown text.
- if ($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 a new block.
- $block_text = "";
- }
- else $block_text .= $tag;
- }
-
- } while ($depth > 0);
-
- #
- # Hash last block text that wasn't processed inside the loop.
- #
- $parsed .= $hash_function($block_text);
-
- return array($parsed, $text);
- }
- function _HashHTMLBlocks_HashBlock($text) {
- global $md_html_hashes, $md_html_blocks;
- $key = md5($text);
- $md_html_hashes[$key] = $text;
- $md_html_blocks[$key] = $text;
- return $key; # String that will replace the tag.
- }
- function _HashHTMLBlocks_HashClean($text) {
- global $md_html_hashes;
- $key = md5($text);
- $md_html_hashes[$key] = $text;
- return $key; # String that will replace the clean tag.
- }
- function _HashBlock($text) {
- #
- # Called whenever a tag must be hashed. When a function insert a block-level
- # tag in $text, it pass through this function and is automaticaly escaped,
- # which remove the need to call _HashHTMLBlocks at every step.
- #
- # Swap back any tag hash found in $text so we do not have to _UnhashTags
- # multiple times at the end. Must do this because of
- $text = _UnhashTags($text);
-
- # Then hash the block as normal.
- return _HashHTMLBlocks_HashBlock($text);
- }
- function _RunBlockGamut($text, $hash_html_blocks = TRUE) {
- #
- # These are all the transformations that form block-level
- # tags like paragraphs, headers, and list items.
- #
- if ($hash_html_blocks) {
- # 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
- # a list item and could have been indented. Indented blocks would have
- # been seen as a code block in previous pass of _HashHTMLBlocks.
- $text = _HashHTMLBlocks($text);
- }
- $text = _DoHeaders($text);
- $text = _DoTables($text);
- # Do Horizontal Rules:
- global $md_empty_element_suffix;
- $text = preg_replace(
- array('{^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$}emx',
- '{^[ ]{0,2}([ ]? -[ ]?){3,}[ \t]*$}emx',
- '{^[ ]{0,2}([ ]? _[ ]?){3,}[ \t]*$}emx'),
- "_HashBlock('\n<hr$md_empty_element_suffix\n')",
- $text);
- $text = _DoLists($text);
- $text = _DoDefLists($text);
- $text = _DoCodeBlocks($text);
- $text = _DoBlockQuotes($text);
- $text = _FormParagraphs($text);
- return $text;
- }
- function _RunSpanGamut($text) {
- #
- # These are all the transformations that occur *within* block-level
- # tags like paragraphs, headers, and list items.
- #
- global $md_empty_element_suffix;
- $text = _DoCodeSpans($text);
- $text = _EscapeSpecialChars($text);
- # Process anchor and image tags. Images must come first,
- # because ![foo][f] looks like an anchor.
- $text = _DoImages($text);
- $text = _DoAnchors($text);
- # 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>).
- $text = _DoAutoLinks($text);
- $text = _EncodeAmpsAndAngles($text);
- $text = _DoItalicsAndBold($text);
- # Do hard breaks:
- $text = preg_replace('/ {2,}\n/', "<br$md_empty_element_suffix\n", $text);
- return $text;
- }
- function _EscapeSpecialChars($text) {
- global $md_escape_table;
- $tokens = _TokenizeHTML($text);
- $text = ''; # rebuild $text from the tokens
- # $in_pre = 0; # Keep track of when we're inside <pre> or <code> tags.
- # $tags_to_skip = "!<(/?)(?:pre|code|kbd|script|math)[\s>]!";
- foreach ($tokens as $cur_token) {
- if ($cur_token[0] == 'tag') {
- # Within tags, encode * and _ so they don't conflict
- # with their use in Markdown for italics and strong.
- # We're replacing each such character with its
- # corresponding MD5 checksum value; this is likely
- # overkill, but it should prevent us from colliding
- # with the escape values by accident.
- $cur_token[1] = str_replace(array('*', '_'),
- array($md_escape_table['*'], $md_escape_table['_']),
- $cur_token[1]);
- $text .= $cur_token[1];
- } else {
- $t = $cur_token[1];
- $t = _EncodeBackslashEscapes($t);
- $text .= $t;
- }
- }
- return $text;
- }
- function _DoAnchors($text) {
- #
- # Turn Markdown link shortcuts into XHTML <a> tags.
- #
- global $md_nested_brackets;
- #
- # First, handle reference-style links: [link text] [id]
- #
- $text = preg_replace_callback("{
- ( # wrap whole match in $1
- \\[
- ($md_nested_brackets) # link text = $2
- \\]
- [ ]? # one optional space
- (?:\\n[ ]*)? # one optional newline followed by spaces
- \\[
- (.*?) # id = $3
- \\]
- )
- }xs",
- '_DoAnchors_reference_callback', $text);
- #
- # Next, inline-style links: [link text](url "optional title")
- #
- $text = preg_replace_callback("{
- ( # wrap whole match in $1
- \\[
- ($md_nested_brackets) # link text = $2
- \\]
- \\( # literal paren
- [ \\t]*
- <?(.*?)>? # href = $3
- [ \\t]*
- ( # $4
- (['\"]) # quote char = $5
- (.*?) # Title = $6
- \\5 # matching quote
- )? # title is optional
- \\)
- )
- }xs",
- '_DoAnchors_inline_callback', $text);
- return $text;
- }
- function _DoAnchors_reference_callback($matches) {
- global $md_urls, $md_titles, $md_escape_table;
- $whole_match = $matches[1];
- $link_text = $matches[2];
- $link_id = strtolower($matches[3]);
- if ($link_id == "") {
- $link_id = strtolower($link_text); # for shortcut links like [this][].
- }
- if (isset($md_urls[$link_id])) {
- $url = $md_urls[$link_id];
- # We've got to encode these to avoid conflicting with italics/bold.
- $url = str_replace(array('*', '_'),
- array($md_escape_table['*'], $md_escape_table['_']),
- $url);
- $result = "<a href=\"$url\"";
- if ( isset( $md_titles[$link_id] ) ) {
- $title = $md_titles[$link_id];
- $title = str_replace(array('*', '_'),
- array($md_escape_table['*'],
- $md_escape_table['_']), $title);
- $result .= " title=\"$title\"";
- }
- $result .= ">$link_text</a>";
- }
- else {
- $result = $whole_match;
- }
- return $result;
- }
- function _DoAnchors_inline_callback($matches) {
- global $md_escape_table;
- $whole_match = $matches[1];
- $link_text = $matches[2];
- $url = $matches[3];
- $title =& $matches[6];
- # We've got to encode these to avoid conflicting with italics/bold.
- $url = str_replace(array('*', '_'),
- array($md_escape_table['*'], $md_escape_table['_']),
- $url);
- $result = "<a href=\"$url\"";
- if (isset($title)) {
- $title = str_replace('"', '"', $title);
- $title = str_replace(array('*', '_'),
- array($md_escape_table['*'], $md_escape_table['_']),
- $title);
- $result .= " title=\"$title\"";
- }
-
- $result .= ">$link_text</a>";
- return $result;
- }
- function _DoImages($text) {
- #
- # Turn Markdown image shortcuts into <img> tags.
- #
- global $md_nested_brackets;
- #
- # First, handle reference-style labeled images: ![alt text][id]
- #
- $text = preg_replace_callback('{
- ( # wrap whole match in $1
- !\[
- ('.$md_nested_brackets.') # alt text = $2
- \]
- [ ]? # one optional space
- (?:\n[ ]*)? # one optional newline followed by spaces
- \[
- (.*?) # id = $3
- \]
- )
- }xs',
- '_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
- !\[
- ('.$md_nested_brackets.') # alt text = $2
- \]
- \( # literal paren
- [ \t]*
- <?(\S+?)>? # src url = $3
- [ \t]*
- ( # $4
- ([\'"]) # quote char = $5
- (.*?) # title = $6
- \5 # matching quote
- [ \t]*
- )? # title is optional
- \)
- )
- }xs',
- '_DoImages_inline_callback', $text);
- return $text;
- }
- function _DoImages_reference_callback($matches) {
- global $md_urls, $md_titles, $md_empty_element_suffix, $md_escape_table;
- $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 = str_replace('"', '"', $alt_text);
- if (isset($md_urls[$link_id])) {
- $url = $md_urls[$link_id];
- # We've got to encode these to avoid conflicting with italics/bold.
- $url = str_replace(array('*', '_'),
- array($md_escape_table['*'], $md_escape_table['_']),
- $url);
- $result = "<img src=\"$url\" alt=\"$alt_text\"";
- if (isset($md_titles[$link_id])) {
- $title = $md_titles[$link_id];
- $title = str_replace(array('*', '_'),
- array($md_escape_table['*'],
- $md_escape_table['_']), $title);
- $result .= " title=\"$title\"";
- }
- $result .= $md_empty_element_suffix;
- }
- else {
- # If there's no such link ID, leave intact:
- $result = $whole_match;
- }
- return $result;
- }
- function _DoImages_inline_callback($matches) {
- global $md_empty_element_suffix, $md_escape_table;
- $whole_match = $matches[1];
- $alt_text = $matches[2];
- $url = $matches[3];
- $title = '';
- if (isset($matches[6])) {
- $title = $matches[6];
- }
- $alt_text = str_replace('"', '"', $alt_text);
- $title = str_replace('"', '"', $title);
- # We've got to encode these to avoid conflicting with italics/bold.
- $url = str_replace(array('*', '_'),
- array($md_escape_table['*'], $md_escape_table['_']),
- $url);
- $result = "<img src=\"$url\" alt=\"$alt_text\"";
- if (isset($title)) {
- $title = str_replace(array('*', '_'),
- array($md_escape_table['*'], $md_escape_table['_']),
- $title);
- $result .= " title=\"$title\""; # $title already quoted
- }
- $result .= $md_empty_element_suffix;
- return $result;
- }
- function _DoHeaders($text) {
- # Setext-style headers:
- # Header 1
- # ========
- #
- # Header 2
- # --------
- #
- $text = preg_replace(
- array('{ (^.+?) (?:[ ]+\{\#([-_:a-zA-Z0-9]+)\})? [ \t]*\n=+[ \t]*\n+ }emx',
- '{ (^.+?) (?:[ ]+\{\#([-_:a-zA-Z0-9]+)\})? [ \t]*\n-+[ \t]*\n+ }emx'),
- array("_HashBlock('<h1'. ('\\2'? ' id=\"'._UnslashQuotes('\\2').'\"':'').
- '>'._RunSpanGamut(_UnslashQuotes('\\1')).'</h1>'
- ) . '\n\n'",
- "_HashBlock('<h2'. ('\\2'? ' id=\"'._UnslashQuotes('\\2').'\"':'').
- '>'._RunSpanGamut(_UnslashQuotes('\\1')).'</h2>'
- ) . '\n\n'"),
- $text);
- # atx-style headers:
- # # Header 1
- # ## Header 2
- # ## Header 2 with closing hashes ##
- # ...
- # ###### Header 6
- #
- $text = preg_replace('{
- ^(\#{1,6}) # $1 = string of #\'s
- [ \t]*
- (.+?) # $2 = Header text
- [ \t]*
- \#* # optional closing #\'s (not counted)
- (?:[ ]+\{\#([-_:a-zA-Z0-9]+)\}[ ]*)? # id attribute
- \n+
- }xme',
- "_HashBlock(
- '<h'.strlen('\\1'). ('\\3'? ' id=\"'._UnslashQuotes('\\3').'\"':'').'>'.
- _RunSpanGamut(_UnslashQuotes('\\2')).
- '</h'.strlen('\\1').'>'
- ) . '\n\n'",
- $text);
- return $text;
- }
- function _DoTables($text) {
- #
- # Form HTML tables.
- #
- global $md_tab_width;
- $less_than_tab = $md_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',
- '_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',
- '_DoTable_callback', $text);
- return $text;
- }
- function _DoTable_LeadingPipe_callback($matches) {
- $head = $matches[1];
- $underline = $matches[2];
- $content = $matches[3];
-
- # Remove leading pipe for each row.
- $content = preg_replace('/^ *[|]/m', '', $content);
-
- return _DoTable_callback(array($matches[0], $head, $underline, $content));
- }
- function _DoTable_callback($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] = ' align="right"';
- else if (preg_match('/^ *:-+: *$/', $s))$attr[$n] = ' align="center"';
- else if (preg_match('/^ *:-+ *$/', $s)) $attr[$n] = ' align="left"';
- else $attr[$n] = '';
- }
-
- # Creating code spans before splitting the row is an easy way to
- # handle a code span containg pipes.
- $head = _DoCodeSpans($head);
- $headers = preg_split('/ *[|] */', $head);
- $col_count = count($headers);
-
- # Write column headers.
- $text = "<table>\n";
- $text .= "<thead>\n";
- $text .= "<tr>\n";
- foreach ($headers as $n => $header)
- $text .= " <th$attr[$n]>"._RunSpanGamut(trim($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) {
- # Creating code spans before splitting the row is an easy way to
- # handle a code span containg pipes.
- $row = _DoCodeSpans($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[$n]>"._RunSpanGamut(trim($cell))."</td>\n";
- $text .= "</tr>\n";
- }
- $text .= "</tbody>\n";
- $text .= "</table>";
-
- return _HashBlock($text) . "\n";
- }
- function _DoLists($text) {
- #
- # Form HTML ordered (numbered) and unordered (bulleted) lists.
- #
- global $md_tab_width, $md_list_level;
- $less_than_tab = $md_tab_width - 1;
- # Re-usable patterns to match list item bullets and number markers:
- $marker_ul = '[*+-]';
- $marker_ol = '\d+[.]';
- $marker_any = "(?:$marker_ul|$marker_ol)";
- $markers = array($marker_ul, $marker_ol);
- foreach ($markers as $marker) {
- # Re-usable pattern to match any entirel ul or ol list:
- $whole_list = '
- ( # $1 = whole list
- ( # $2
- [ ]{0,'.$less_than_tab.'}
- ('.$marker.') # $3 = first list item marker
- [ \t]+
- )
- (?s:.+?)
- ( # $4
- \z
- |
- \n{2,}
- (?=\S)
- (?! # Negative lookahead for another list item marker
- [ \t]*
- '.$marker.'[ \t]+
- )
- )
- )
- '; // mx
-
- # We use a different prefix before nested lists than top-level lists.
- # See extended comment in _ProcessListItems().
-
- if ($md_list_level) {
- $text = preg_replace_callback('{
- ^
- '.$whole_list.'
- }mx',
- '_DoLists_callback', $text);
- }
- else {
- $text = preg_replace_callback('{
- (?:(?<=\n\n)|\A\n?)
- '.$whole_list.'
- }mx',
- '_DoLists_callback', $text);
- }
- }
- return $text;
- }
- function _DoLists_callback($matches) {
- # Re-usable patterns to match list item bullets and number markers:
- $marker_ul = '[*+-]';
- $marker_ol = '\d+[.]';
- $marker_any = "(?:$marker_ul|$marker_ol)";
-
- $list = $matches[1];
- $list_type = preg_match("/$marker_ul/", $matches[3]) ? "ul" : "ol";
-
- $marker_any = ( $list_type == "ul" ? $marker_ul : $marker_ol );
-
- # Turn double returns into triple returns, so that we can make a
- # paragraph for the last item in a list, if necessary:
- $list = preg_replace("/\n{2,}/", "\n\n\n", $list);
- $result = _ProcessListItems($list, $marker_any);
- $result = "<$list_type>\n" . $result . "</$list_type>";
- return "\n" . _HashBlock($result) . "\n\n";
- }
- function _ProcessListItems($list_str, $marker_any) {
- #
- # Process the contents of a single ordered or unordered list, splitting it
- # into individual list items.
- #
- global $md_list_level;
-
- # The $md_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.".
-
- $md_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
- (^[ \t]*) # leading whitespace = $2
- ('.$marker_any.') [ \t]+ # list marker = $3
- ((?s:.+?) # list item text = $4
- (\n{1,2}))
- (?= \n* (\z | \2 ('.$marker_any.') [ \t]+))
- }xm',
- '_ProcessListItems_callback', $list_str);
- $md_list_level--;
- return $list_str;
- }
- function _ProcessListItems_callback($matches) {
- $item = $matches[4];
- $leading_line =& $matches[1];
- $leading_space =& $matches[2];
- if ($leading_line || preg_match('/\n{2,}/', $item)) {
- $item = _RunBlockGamut(_Outdent($item));
- }
- else {
- # Recursion for sub-lists:
- $item = _DoLists(_Outdent($item));
- $item = preg_replace('/\n+$/', '', $item);
- $item = _RunSpanGamut($item);
- }
- return "<li>" . $item . "</li>\n";
- }
- function _DoDefLists($text) {
- #
- # Form HTML definition lists.
- #
- global $md_tab_width;
- $less_than_tab = $md_tab_width - 1;
- # Re-usable patterns to match list item bullets and number markers:
- # Re-usable pattern to match any entire dl list:
- $whole_list = '
- ( # $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
- $text = preg_replace_callback('{
- (?:(?<=\n\n)|\A\n?)
- '.$whole_list.'
- }mx',
- '_DoDefLists_callback', $text);
- return $text;
- }
- function _DoDefLists_callback($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:
- $result = trim(_ProcessDefListItems($list));
- $result = "<dl>\n" . $result . "\n</dl>";
- return _HashBlock($result) . "\n\n";
- }
- function _ProcessDefListItems($list_str) {
- #
- # Process the contents of a single ordered or unordered list, splitting it
- # into individual list items.
- #
- global $md_tab_width;
- $less_than_tab = $md_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('{
- (?:\n\n+|\A\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',
- '_ProcessDefListItems_callback_dt', $list_str);
- # Process actual definitions.
- $list_str = preg_replace_callback('{
- \n(\n+)? # leading line = $1
- [ ]{0,'.$less_than_tab.'} # whitespace before colon
- [:][ ]+ # definition mark (colon)
- ((?s:.+?)) # definition text = $2
- (?= \n+ # stop at next definition mark,
- (?: # next term or end of text
- [ ]{0,'.$less_than_tab.'} [:][ ] |
- <dt> | \z
- )
- )
- }xm',
- '_ProcessDefListItems_callback_dd', $list_str);
- return $list_str;
- }
- function _ProcessDefListItems_callback_dt($matches) {
- $terms = explode("\n", trim($matches[1]));
- $text = '';
- foreach ($terms as $term) {
- $term = _RunSpanGamut(trim($term));
- $text .= "\n<dt>" . $term . "</dt>";
- }
- return $text . "\n";
- }
- function _ProcessDefListItems_callback_dd($matches) {
- $leading_line = $matches[1];
- $def = $matches[2];
- if ($leading_line || preg_match('/\n{2,}/', $def)) {
- $def = _RunBlockGamut(_Outdent($def . "\n\n"));
- $def = "\n". $def ."\n";
- }
- else {
- $def = rtrim($def);
- $def = _RunSpanGamut(_Outdent($def));
- }
- return "\n<dd>" . $def . "</dd>\n";
- }
- function _DoCodeBlocks($text) {
- #
- # Process Markdown `<pre><code>` blocks.
- #
- global $md_tab_width;
- $text = preg_replace_callback("{
- (?:\\n\\n|\\A)
- ( # $1 = the code block -- one or more lines, starting with a space/tab
- (?:
- (?:[ ]\{$md_tab_width} | \\t) # Lines must start with a tab or a tab-width of spaces
- .*\\n+
- )+
- )
- ((?=^[ ]{0,$md_tab_width}\\S)|\\Z) # Lookahead for non-space at line-start, or end of doc
- }xm",
- '_DoCodeBlocks_callback', $text);
- return $text;
- }
- function _DoCodeBlocks_callback($matches) {
- $codeblock = $matches[1];
- $codeblock = _EncodeCode(_Outdent($codeblock));
- // $codeblock = _Detab($codeblock);
- # trim leading newlines and trailing whitespace
- $codeblock = preg_replace(array('/\A\n+/', '/\s+\z/'), '', $codeblock);
- $result = "<pre><code>" . $codeblock . "\n</code></pre>";
- return "\n\n" . _HashBlock($result) . "\n\n";
- }
- function _DoCodeSpans($text) {
- #
- # * Backtick quotes are used for <code></code> spans.
- #
- # * You can use multiple backticks as the delimiters if you want to
- # include literal backticks in the code span. So, this input:
- #
- # Just type ``foo `bar` baz`` at the prompt.
- #
- # Will translate to:
- #
- # <p>Just type <code>foo `bar` baz</code> at the prompt.</p>
- #
- # There's no arbitrary limit to the number of backticks you
- # can use as delimters. If you need three consecutive backticks
- # in your code, use four for delimiters, etc.
- #
- # * You can use spaces to get literal backticks at the edges:
- #
- # ... type `` `bar` `` ...
- #
- # Turns to:
- #
- # ... type <code>`bar`</code> ...
- #
- $text = preg_replace_callback('@
- (?<!\\\) # Character before opening ` can\'t be a backslash
- (`+) # $1 = Opening run of `
- (.+?) # $2 = The code block
- (?<!`)
- \1 # Matching closer
- (?!`)
- @xs',
- '_DoCodeSpans_callback', $text);
- return $text;
- }
- function _DoCodeSpans_callback($matches) {
- $c = $matches[2];
- $c = preg_replace('/^[ \t]*/', '', $c); # leading whitespace
- $c = preg_replace('/[ \t]*$/', '', $c); # trailing whitespace
- $c = _EncodeCode($c);
- return "<code>$c</code>";
- }
- function _EncodeCode($_) {
- #
- # Encode/escape certain characters inside Markdown code runs.
- # The point is that in code, these characters are literals,
- # and lose their special Markdown meanings.
- #
- global $md_escape_table;
- # Encode all ampersands; HTML entities are not
- # entities within a Markdown code span.
- $_ = str_replace('&', '&', $_);
- # Do the angle bracket song and dance:
- $_ = str_replace(array('<', '>'),
- array('<', '>'), $_);
- # Now, escape characters that are magic in Markdown:
- $_ = str_replace(array_keys($md_escape_table),
- array_values($md_escape_table), $_);
- return $_;
- }
- function _DoItalicsAndBold($text) {
- # <strong> must go first:
- $text = preg_replace(array(
- '{
- ( (?<!\w) __ ) # $1: Marker (not preceded by alphanum)
- (?=\S) # Not followed by whitespace
- (?!__) # or two others marker chars.
- ( # $2: Content
- (?>
- [^_]+? # Anthing not em markers.
- |
- # Balence any regular _ emphasis inside.
- (?<![a-zA-Z0-9])_ (?=\S) (?! _) (.+?)
- (?<=\S) _ (?![a-zA-Z0-9])
- )+?
- )
- (?<=\S) __ # End mark not preceded by whitespace.
- (?!\w) # Not followed by alphanum.
- }sx',
- '{
- ( (?<!\*\*) \*\* ) # $1: Marker (not preceded by two *)
- (?=\S) # Not followed by whitespace
- (?!\1) # or two others marker chars.
- ( # $2: Content
- (?>
- [^*]+? # Anthing not em markers.
- |
- # Balence any regular * emphasis inside.
- \* (?=\S) (?! \*) (.+?) (?<=\S) \*
- )+?
- )
- (?<=\S) \*\* # End mark not preceded by whitespace.
- }sx',
- ),
- '<strong>\2</strong>', $text);
- # Then <em>:
- $text = preg_replace(array(
- '{ ( (?<!\w) _ ) (?=\S) (?! _) (.+?) (?<=\S) _ (?!\w) }sx',
- '{ ( (?<!\*)\* ) (?=\S) (?! \*) (.+?) (?<=\S) \* }sx',
- ),
- '<em>\2</em>', $text);
- return $text;
- }
- function _DoBlockQuotes($text) {
- $text = preg_replace_callback('/
- ( # Wrap whole match in $1
- (
- ^[ \t]*>[ \t]? # ">" at the start of a line
- .+\n # rest of the first line
- (.+\n)* # subsequent consecutive lines
- \n* # blanks
- )+
- )
- /xm',
- '_DoBlockQuotes_callback', $text);
- return $text;
- }
- function _DoBlockQuotes_callback($matches) {
- $bq = $matches[1];
- # trim one level of quoting - trim whitespace-only lines
- $bq = preg_replace(array('/^[ \t]*>[ \t]?/m', '/^[ \t]+$/m'), '', $bq);
- $bq = _RunBlockGamut($bq); # recurse
- $bq = preg_replace('/^/m', " ", $bq);
- # These leading spaces screw with <pre> content, so we need to fix that:
- $bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx',
- '_DoBlockQuotes_callback2', $bq);
- return _HashBlock("<blockquote>\n$bq\n</blockquote>") . "\n\n";
- }
- function _DoBlockQuotes_callback2($matches) {
- $pre = $matches[1];
- $pre = preg_replace('/^ /m', '', $pre);
- return $pre;
- }
- function _FormParagraphs($text) {
- #
- # Params:
- # $text - string to process with html <p> tags
- #
- global $md_html_blocks, $md_html_hashes;
- # Strip leading and trailing lines:
- $text = preg_replace(array('/\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) {
- $value = trim(_RunSpanGamut($value));
-
- # Check if this should be enclosed in a paragraph.
- # Text equaling to a clean tag hash are not enclosed.
- # Text starting with a block tag hash are not either.
- $clean_key = $value;
- $block_key = substr($value, 0, 32);
-
- $is_p = (!isset($md_html_blocks[$block_key]) &&
- !isset($md_html_hashes[$clean_key]));
-
- if ($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.
- $text = _UnhashTags($text);
-
- return $text;
- }
- function _EncodeAmpsAndAngles($text) {
- # Smart processing for ampersands and angle brackets that need to be encoded.
- # 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 naked <'s
- $text = preg_replace('{<(?![a-z/?\$!])}i', '<', $text);
- return $text;
- }
- function _EncodeBackslashEscapes($text) {
- #
- # Parameter: String.
- # Returns: The string, with after processing the following backslash
- # escape sequences.
- #
- global $md_escape_table, $md_backslash_escape_table;
- # Must process escaped backslashes first.
- return str_replace(array_keys($md_backslash_escape_table),
- array_values($md_backslash_escape_table), $text);
- }
- function _DoAutoLinks($text) {
- $text = preg_replace("!<((https?|ftp):[^'\">\\s]+)>!",
- '<a href="\1">\1</a>', $text);
- # Email addresses: <address@domain.foo>
- $text = preg_replace('{
- <
- (?:mailto:)?
- (
- [-.\w]+
- \@
- [-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
- )
- >
- }exi',
- "_EncodeEmailAddress(_UnescapeSpecialChars(_UnslashQuotes('\\1')))",
- $text);
- return $text;
- }
- function _EncodeEmailAddress($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.:
- #
- # <a href="mailto:foo@e
- # xample.com">foo
- # @example.com</a>
- #
- # Based by a filter by Matthew Wickline, posted to the BBEdit-Talk
- # mailing list: <http://tinyurl.com/yu7ue>
- #
- $addr = "mailto:" . $addr;
- $length = strlen($addr);
- # leave ':' alone (to spot mailto: later)
- $addr = preg_replace_callback('/([^\:])/',
- '_EncodeEmailAddress_callback', $addr);
- $addr = "<a href=\"$addr\">$addr</a>";
- # strip the mailto: from the visible part
- $addr = preg_replace('/">.+?:/', '">', $addr);
- return $addr;
- }
- function _EncodeEmailAddress_callback($matches) {
- $char = $matches[1];
- $r = rand(0, 100);
- # roughly 10% raw, 45% hex, 45% dec
- # '@' *must* be encoded. I insist.
- if ($r > 90 && $char != '@') return $char;
- if ($r < 45) return '&#x'.dechex(ord($char)).';';
- return '&#'.ord($char).';';
- }
- function _UnescapeSpecialChars($text) {
- #
- # Swap back in all the speā¦
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