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markdown_extra.php
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markdown_extra.php
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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 1.0.1'; # Fri 9 Dec 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;
#
# 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.