790 lines
19 KiB
PHP
790 lines
19 KiB
PHP
<?php
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/*
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Plugin Name: MarkDown
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Plugin URI: http://daringfireball.net/projects/markdown/
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Description: Markdown is a text-to-HTML conversion tool for web writers. <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, then convert it to structurally valid XHTML. This plugin <strong>enables Markdown for your posts and comments</strong>. Written by <a href="http://daringfireball.net/">John Gruber</a> in Perl, translated to PHP by <a href="http://www.michelf.com/">Michel Fortin</a>, and made a WP plugin by <a href="http://photomatt.net/">Matt</a>. If you use this you should disable Textile 1 and 2 because the syntax conflicts.
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Version: 1.0b4
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Author: John Gruber
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Author URI: http://daringfireball.net/
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*/
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/*
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Note to code readers: I've stripped most of the comments from the source, see the original at http://www.michelf.com/php-markdown/?code to get the unaltered version. --Matt
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*/
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$MarkdownPHPVersion = '1.0b4.1'; # Sun 4 Apr 2004
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$MarkdownSyntaxVersion = '1.0b4'; # Thu 25 Mar 2004
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$g_empty_element_suffix = " />"; # Change to ">" for HTML output
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$g_tab_width = 4;
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$g_nested_brackets_depth = 6;
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$g_nested_brackets =
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str_repeat('(?>[^\[\]]+|\[', $g_nested_brackets_depth).
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str_repeat('\])*', $g_nested_brackets_depth);
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$g_escape_table = array(
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"\\" => md5("\\"),
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"`" => md5("`"),
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"*" => md5("*"),
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"_" => md5("_"),
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"{" => md5("{"),
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"}" => md5("}"),
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"[" => md5("["),
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"]" => md5("]"),
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"(" => md5("("),
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")" => md5(")"),
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"#" => md5("#"),
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"." => md5("."),
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"!" => md5("!")
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);
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$g_backslash_escape_table;
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foreach ($g_escape_table as $key => $char)
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$g_backslash_escape_table["\\$key"] = $char;
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$g_urls;
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$g_titles;
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$g_html_blocks;
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function Markdown($text) {
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global $g_urls, $g_titles, $g_html_blocks;
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$g_urls = array();
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$g_titles = array();
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$g_html_blocks = array();
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$text = str_replace(array("\r\n", "\r"), "\n", $text);
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$text .= "\n\n";
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$text = _Detab($text);
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$text = preg_replace('/^[ \t]+$/m', '', $text);
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$text = _HashHTMLBlocks($text);
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$text = _StripLinkDefinitions($text);
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$text = _EscapeSpecialChars($text);
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$text = _RunBlockGamut($text);
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$text = _UnescapeSpecialChars($text);
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return $text . "\n";
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}
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function _StripLinkDefinitions($text) {
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$text = preg_replace_callback('{
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^[ \t]*\[(.+)\]: # id = $1
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[ \t]*
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\n? # maybe *one* newline
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[ \t]*
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(\S+) # url = $2
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[ \t]*
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\n? # maybe one newline
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[ \t]*
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(?:
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# Todo: Titles are delimited by "quotes" or (parens).
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["(]
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(.+?) # title = $3
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[")]
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[ \t]*
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)? # title is optional
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(?:\n+|\Z)
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}xm',
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'_StripLinkDefinitions_callback',
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$text);
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return $text;
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}
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function _StripLinkDefinitions_callback($matches) {
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global $g_urls, $g_titles;
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$link_id = strtolower($matches[1]);
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$g_urls[$link_id] = _EncodeAmpsAndAngles($matches[2]);
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if (isset($matches[3]))
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$g_titles[$link_id] = htmlentities($matches[3]);
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return ''; # String that will replace the block
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}
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function _HashHTMLBlocks($text) {
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$block_tag_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script';
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$text = preg_replace_callback("{
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( # save in $1
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^ # start of line (with /m)
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<($block_tag_re) # start tag = $2
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\\b # word break
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(.*\\n)*? # any number of lines, minimally matching
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</\\2> # the matching end tag
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[ \\t]* # trailing spaces/tabs
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(?=\\n+|\\Z) # followed by a newline or end of document
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)
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}xm",
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'_HashHTMLBlocks_callback',
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$text);
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$text = preg_replace_callback("{
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( # save in $1
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^ # start of line (with /m)
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<($block_tag_re) # start tag = $2
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\\b # word break
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(.*\\n)*? # any number of lines, minimally matching
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.*</\\2> # the matching end tag
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[ \\t]* # trailing spaces/tabs
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(?=\\n+|\\Z) # followed by a newline or end of document
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)
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}xm",
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'_HashHTMLBlocks_callback',
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$text);
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$text = preg_replace_callback('{
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(?:
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(?<=\n\n) # Starting after a blank line
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| # or
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\A\n? # the beginning of the doc
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)
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( # save in $1
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[ \t]*
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<(hr) # start tag = $2
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\b # word break
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([^<>])*? #
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/?> # the matching end tag
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(?=\n{2,}|\Z) # followed by a blank line or end of document
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)
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}x',
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'_HashHTMLBlocks_callback',
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$text);
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return $text;
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}
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function _HashHTMLBlocks_callback($matches) {
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global $g_html_blocks;
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$text = $matches[1];
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$key = md5($text);
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$g_html_blocks[$key] = $text;
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return "\n\n$key\n\n"; # String that will replace the block
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}
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function _RunBlockGamut($text) {
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global $g_empty_element_suffix;
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$text = _DoHeaders($text);
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$text = preg_replace(
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array('/^( ?\* ?){3,}$/m',
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'/^( ?- ?){3,}$/m'),
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array("\n<hr$g_empty_element_suffix\n",
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"\n<hr$g_empty_element_suffix\n"),
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$text);
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$text = _DoLists($text);
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$text = _DoCodeBlocks($text);
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$text = _DoBlockQuotes($text);
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$text = _DoAutoLinks($text);
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$text = _HashHTMLBlocks($text);
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$text = _FormParagraphs($text);
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return $text;
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}
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function _RunSpanGamut($text) {
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global $g_empty_element_suffix;
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$text = _DoCodeSpans($text);
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$text = _EncodeAmpsAndAngles($text);
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$text = _DoImages($text);
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$text = _DoAnchors($text);
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$text = _DoItalicsAndBold($text);
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# Do hard breaks:
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$text = preg_replace('/ {2,}\n/', "<br$g_empty_element_suffix\n", $text);
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return $text;
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}
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function _EscapeSpecialChars($text) {
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global $g_escape_table;
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$tokens = _TokenizeHTML($text);
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$text = ''; # rebuild $text from the tokens
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$in_pre = 0; # Keep track of when we're inside <pre> or <code> tags.
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$tags_to_skip = "!<(/?)(?:pre|code|kbd|script)[\s>]!";
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foreach ($tokens as $cur_token) {
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if ($cur_token[0] == 'tag') {
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$cur_token[1] = str_replace(array('*', '_'),
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array($g_escape_table['*'], $g_escape_table['_']),
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$cur_token[1]);
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$text .= $cur_token[1];
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} else {
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$t = $cur_token[1];
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if (! $in_pre) {
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$t = _EncodeBackslashEscapes($t);
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# $t =~ s{([a-z])/([a-z])}{$1 / $2}ig;
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}
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$text .= $t;
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}
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}
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return $text;
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}
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function _DoAnchors($text) {
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global $g_nested_brackets;
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$text = preg_replace_callback("{
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( # wrap whole match in $1
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\\[
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($g_nested_brackets) # link text = $2
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\\]
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[ ]? # one optional space
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(?:\\n[ ]*)? # one optional newline followed by spaces
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\\[
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(.*?) # id = $3
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\\]
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)
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}xs",
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'_DoAnchors_reference_callback', $text);
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$text = preg_replace_callback("{
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( # wrap whole match in $1
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\\[
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($g_nested_brackets) # link text = $2
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\\]
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\\( # literal paren
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[ \\t]*
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(.+?) # href = $3
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[ \\t]*
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( # title = $4
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(['\"]) # quote char = $5
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.*?
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\\5 # matching quote
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)? # title is optional
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\\)
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)
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}xs",
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'_DoAnchors_inline_callback', $text);
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return $text;
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}
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function _DoAnchors_reference_callback($matches) {
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global $g_urls, $g_titles;
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$result;
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$whole_match = $matches[1];
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$link_text = $matches[2];
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$link_id = strtolower($matches[3]);
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if ($link_id == "") {
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$link_id = strtolower($link_text); # for shortcut links like [this][].
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}
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if (isset($g_urls[$link_id])) {
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$url = $g_urls[$link_id];
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$url = str_replace(array('*', '_'),
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array('*', '_'), $url);
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$result = "<a href='$url'";
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if ( isset( $g_title[$link_id] ) ) {
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$title = $g_titles[$link_id];
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$title = str_replace(array('*', '_'),
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array('*', '_'), $title);
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$result .= " title=\"$title\"";
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}
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$result .= ">$link_text</a>";
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}
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else {
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$result = $whole_match;
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}
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return $result;
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}
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function _DoAnchors_inline_callback($matches) {
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$result;
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$whole_match = $matches[1];
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$link_text = $matches[2];
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$url = $matches[3];
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$title = $matches[4];
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# We've got to encode these to avoid conflicting with italics/bold.
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$url = str_replace(array('*', '_'),
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array('*', '_'), $url);
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$result = "<a href=\"$url\"";
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if ($title) {
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$title = str_replace(array('*', '_'),
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array('*', '_'), $title);
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$result .= " title=$title";
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}
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$result .= ">$link_text</a>";
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return $result;
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}
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function _DoImages($text) {
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$text = preg_replace_callback('{
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( # wrap whole match in $1
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!\[
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(.*?) # alt text = $2
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\]
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[ ]? # one optional space
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(?:\n[ ]*)? # one optional newline followed by spaces
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\[
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(.*?) # id = $3
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\]
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)
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}xs',
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'_DoImages_reference_callback', $text);
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#
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# Next, handle inline images: 
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# Don't forget: encode * and _
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$text = preg_replace_callback("{
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( # wrap whole match in $1
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!\\[
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(.*?) # alt text = $2
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\\]
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\\( # literal paren
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[ \\t]*
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(\\S+) # src url = $3
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[ \\t]*
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( # title = $4
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(['\"]) # quote char = $5
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.*?
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\\5 # matching quote
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[ \\t]*
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)? # title is optional
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\\)
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)
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}xs",
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'_DoImages_inline_callback', $text);
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return $text;
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}
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function _DoImages_reference_callback($matches) {
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global $g_urls, $g_titles, $g_empty_element_suffix;
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$result;
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$whole_match = $matches[1];
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$alt_text = $matches[2];
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$link_id = strtolower($matches[3]);
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if ($link_id == "") {
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$link_id = strtolower($alt_text); # for shortcut links like ![this][].
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}
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if (isset($g_urls[$link_id])) {
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$url = $g_urls[$link_id];
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$url = str_replace(array('*', '_'),
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array('*', '_'), $url);
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$result = "<img src=\"$url\" alt=\"$alt_text\"";
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if (isset($g_titles[$link_id])) {
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$title = $g_titles[$link_id];
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$title = str_replace(array('*', '_'),
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array('*', '_'), $title);
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$result .= " title=\"$title\"";
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}
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$result .= $g_empty_element_suffix;
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}
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else {
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$result = $whole_match;
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}
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return $result;
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}
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function _DoImages_inline_callback($matches) {
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global $g_empty_element_suffix;
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$result;
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$whole_match = $matches[1];
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$alt_text = $matches[2];
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$url = $matches[3];
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$title = $matches[4];
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$url = str_replace(array('*', '_'),
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array('*', '_'), $url);
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$result = "<img src=\"$url\" alt=\"$alt_text\"";
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if (isset($title)) {
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$title = str_replace(array('*', '_'),
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array('*', '_'), $title);
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$result .= " title=$title"; # $title already quoted
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}
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$result .= $g_empty_element_suffix;
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return $result;
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}
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function _DoHeaders($text) {
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$text = preg_replace(
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array("/(.+)[ \t]*\n=+[ \t]*\n+/e",
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"/(.+)[ \t]*\n-+[ \t]*\n+/e"),
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array("'<h1>'._RunSpanGamut(_UnslashQuotes('\\1')).'</h1>\n\n'",
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"'<h2>'._RunSpanGamut(_UnslashQuotes('\\1')).'</h2>\n\n'"),
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$text);
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$text = preg_replace("{
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^(\\#{1,6}) # $1 = string of #'s
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[ \\t]*
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(.+?) # $2 = Header text
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[ \\t]*
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\\#* # optional closing #'s (not counted)
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\\n+
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}xme",
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"'<h'.strlen('\\1').'>'._RunSpanGamut(_UnslashQuotes('\\2')).'</h'.strlen('\\1').'>\n\n'",
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$text);
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return $text;
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}
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function _DoLists($text) {
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global $g_tab_width;
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$less_than_tab = $g_tab_width - 1;
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$text = preg_replace_callback("{
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(
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(
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^[ ]{0,$less_than_tab}
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(\\*|\\d+[.])
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[ \\t]+
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)
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(?s:.+?)
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(
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\\z
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\\n{2,}
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(?=\\S)
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(?![ \\t]* (\\*|\\d+[.]) [ \\t]+)
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)
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)
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}xm",
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'_DoLists_callback', $text);
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return $text;
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}
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function _DoLists_callback($matches) {
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$list_type = ($matches[3] == "*") ? "ul" : "ol";
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$list = $matches[1];
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$list = preg_replace("/\n{2,}/", "\n\n\n", $list);
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$result = _ProcessListItems($list);
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$result = "<$list_type>\n" . $result . "</$list_type>\n";
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return $result;
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}
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function _ProcessListItems($list_str) {
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# trim trailing blank lines:
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$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);
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$list_str = preg_replace_callback('{
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(\n)? # leading line = $1
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(^[ \t]*) # leading whitespace = $2
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(\*|\d+[.]) [ \t]+ # list marker = $3
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((?s:.+?) # list item text = $4
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(\n{1,2}))
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(?= \n* (\z | \2 (\*|\d+[.]) [ \t]+))
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}xm',
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'_ProcessListItems_callback', $list_str);
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return $list_str;
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}
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function _ProcessListItems_callback($matches) {
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$item = $matches[4];
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$leading_line = $matches[1];
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$leading_space = $matches[2];
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if ($leading_line || preg_match('/\n{2,}/', $item)) {
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$item = _RunBlockGamut(_Outdent($item));
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#$item =~ s/\n+/\n/g;
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}
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else {
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# Recursion for sub-lists:
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$item = _DoLists(_Outdent($item));
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$item = rtrim($item, "\n");
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$item = _RunSpanGamut($item);
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}
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return "<li>" . $item . "</li>\n";
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}
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function _DoCodeBlocks($text) {
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global $g_tab_width;
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$text = preg_replace_callback("{
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(.?) # $1 = preceding character
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(:) # $2 = colon delimiter
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(\\n+) # $3 = newlines after colon
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( # $4 = the code block -- one or more lines, starting with a space/tab
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(?:
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(?:[ ]\{$g_tab_width} | \\t) # Lines must start with a tab or a tab-width of spaces
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.*\\n+
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)+
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)
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((?=^[ ]{0,$g_tab_width}\\S)|\\Z) # Lookahead for non-space at line-start, or end of doc
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}xm",
|
|
'_DoCodeBlocks_callback', $text);
|
|
|
|
return $text;
|
|
}
|
|
function _DoCodeBlocks_callback($matches) {
|
|
$prevchar = $matches[1];
|
|
$newlines = $matches[2];
|
|
$codeblock = $matches[4];
|
|
|
|
$result; # return value
|
|
|
|
|
|
$prefix = "";
|
|
if (!(preg_match('/\s/', $prevchar) || ($prevchar == ""))) {
|
|
$prefix = "$prevchar:";
|
|
}
|
|
$codeblock = _EncodeCode(_Outdent($codeblock));
|
|
$codeblock = _Detab($codeblock);
|
|
# trim leading newlines and trailing whitespace
|
|
$codeblock = preg_replace(array('/\A\n+/', '/\s+\z/'), '', $codeblock);
|
|
|
|
$result = $prefix . "\n\n<pre><code>" . $codeblock . "\n</code></pre>\n\n";
|
|
|
|
return $result;
|
|
}
|
|
|
|
|
|
function _DoCodeSpans($text) {
|
|
$text = preg_replace_callback("@
|
|
(`+) # Opening run of `
|
|
(.+?) # the code block
|
|
(?<!`)
|
|
\\1
|
|
(?!`)
|
|
@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>$c</code>";
|
|
}
|
|
|
|
|
|
function _EncodeCode($_) {
|
|
|
|
global $g_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:
|
|
$_ = str_replace(array_keys($g_escape_table),
|
|
array_values($g_escape_table), $_);
|
|
|
|
return $_;
|
|
}
|
|
|
|
|
|
function _DoItalicsAndBold($text) {
|
|
# <strong> must go first:
|
|
$text = preg_replace('{ (\*\*|__) (?=\S) (.+?) (?<=\S) \1 }sx',
|
|
'<strong>\2</strong>', $text);
|
|
# Then <em>:
|
|
$text = preg_replace('{ (\*|_) (?=\S) (.+?) (?<=\S) \1 }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];
|
|
$bq = preg_replace('/^[ \t]*>[ \t]?/m', '', $bq);
|
|
$bq = _RunBlockGamut($bq); # recurse
|
|
$bq = preg_replace('/^/m', "\t", $bq);
|
|
|
|
return "<blockquote>\n$bq\n</blockquote>\n\n";
|
|
}
|
|
|
|
|
|
function _FormParagraphs($text) {
|
|
global $g_html_blocks;
|
|
|
|
# Strip leading and trailing lines:
|
|
$text = preg_replace(array('/\A\n+/', '/\n+\z/'), '', $text);
|
|
|
|
$grafs = preg_split('/\n{2,}/', $text);
|
|
$count = count($graph);
|
|
|
|
|
|
foreach ($grafs as $key => $value) {
|
|
if (!isset( $g_html_blocks[$value] )) {
|
|
$value = _RunSpanGamut($value);
|
|
$value = preg_replace('/^([ \t]*)/', '<p>', $value);
|
|
$value .= "</p>";
|
|
$grafs[$key] = $value;
|
|
}
|
|
}
|
|
|
|
|
|
foreach ($grafs as $key => $value) {
|
|
if (isset( $g_html_blocks[$value] )) {
|
|
$grafs[$key] = $g_html_blocks[$value];
|
|
}
|
|
}
|
|
|
|
return implode("\n\n", $grafs);
|
|
}
|
|
|
|
|
|
function _EncodeAmpsAndAngles($text) {
|
|
$text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w{1,8});)/',
|
|
'&', $text);;
|
|
|
|
# Encode naked <'s
|
|
$text = preg_replace('{<(?![a-z/?\$!])}i', '<', $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
function _EncodeBackslashEscapes($text) {
|
|
global $g_escape_table, $g_backslash_escape_table;
|
|
# Must process escaped backslashes first.
|
|
return str_replace(array_keys($g_backslash_escape_table),
|
|
array_values($g_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('{
|
|
<
|
|
(
|
|
[-.\w]+
|
|
\@
|
|
[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
|
|
)
|
|
>
|
|
}exi',
|
|
"_EncodeEmailAddress(_UnescapeSpecialChars(_UnslashQuotes('\\1')))",
|
|
$text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
function _EncodeEmailAddress($addr) {
|
|
$addr = "mailto:" . $addr;
|
|
$length = strlen($addr);
|
|
|
|
$addr = preg_replace_callback('/([^\:])/',
|
|
'_EncodeEmailAddress_callback', $addr);
|
|
|
|
$addr = "<a href=\"$addr\">$addr</a>";
|
|
$addr = preg_replace('/">.+?:/', '">', $addr);
|
|
|
|
return $addr;
|
|
}
|
|
function _EncodeEmailAddress_callback($matches) {
|
|
$char = $matches[1];
|
|
$r = rand(0, 100);
|
|
if ($r > 90 && $char != '@') return $char;
|
|
if ($r < 45) return '&#x'.dechex(ord($char)).';';
|
|
return '&#'.ord($char).';';
|
|
}
|
|
|
|
|
|
function _UnescapeSpecialChars($text) {
|
|
global $g_escape_table;
|
|
return str_replace(array_values($g_escape_table),
|
|
array_keys($g_escape_table), $text);
|
|
}
|
|
|
|
|
|
function _TokenizeHTML($str) {
|
|
$pos = 0;
|
|
$len = strlen($str);
|
|
$tokens = array();
|
|
|
|
$depth = 6;
|
|
$nested_tags = str_repeat('(?:<[a-z\/!$](?:[^<>]|',$depth)
|
|
.str_repeat(')*>)', $depth);
|
|
$match = "(?s:<!(--.*?--\s*)+>)|". # comment
|
|
"(?s:<\?.*?\?>)|". # processing instruction
|
|
"$nested_tags"; # nested tags
|
|
|
|
preg_match_all("/($match)/", $str, $matches,
|
|
PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
|
|
|
|
foreach ($matches as $element) {
|
|
$whole_tag = $element[0][0];
|
|
$tag_start = $element[0][1];
|
|
$sec_start = $tag_start + strlen($whole_tag);
|
|
if ($pos < $tag_start) {
|
|
array_push($tokens, array('text',
|
|
substr($str, $pos, $tag_start - $pos)));
|
|
}
|
|
array_push($tokens, array('tag', $whole_tag));
|
|
$pos = $sec_start;
|
|
}
|
|
|
|
if ($pos < $len)
|
|
array_push($tokens, array('text',
|
|
substr($str, $pos, $len - $pos)));
|
|
return $tokens;
|
|
}
|
|
|
|
|
|
function _Outdent($text) {
|
|
global $g_tab_width;
|
|
return preg_replace("/^(\\t|[ ]{1,$g_tab_width})/m", "", $text);
|
|
}
|
|
|
|
|
|
function _Detab($text) {
|
|
global $g_tab_width;
|
|
$text = preg_replace(
|
|
"/(.*?)\t/e",
|
|
"'\\1'.str_repeat(' ', $g_tab_width - strlen('\\1') % $g_tab_width)",
|
|
$text);
|
|
return $text;
|
|
}
|
|
|
|
|
|
function _UnslashQuotes($text) {
|
|
return str_replace('\"', '"', $text);
|
|
}
|
|
|
|
// And now for the filters
|
|
remove_filter('the_content', 'wpautop');
|
|
remove_filter('the_excerpt', 'wpautop');
|
|
remove_filter('comment_text', 'wpautop');
|
|
|
|
add_filter('the_content', 'Markdown');
|
|
add_filter('the_excerpt', 'Markdown');
|
|
remove_filter('comment_text', 'Markdown');
|
|
|
|
?>
|