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MultiMarkdown.pm
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MultiMarkdown.pm
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package Text::MultiMarkdown;
require 5.008_000;
use strict;
use warnings;
use re 'eval';
use Digest::MD5 qw(md5_hex);
use Encode qw();
use Carp qw(croak);
use base qw(Text::Markdown);
our $VERSION = '1.0.27';
our @EXPORT_OK = qw(markdown);
=head1 NAME
Text::MultiMarkdown - Convert MultiMarkdown syntax to (X)HTML
=head1 SYNOPSIS
use Text::MultiMarkdown 'markdown';
my $html = markdown($text);
use Text::MultiMarkdown 'markdown';
my $html = markdown( $text, {
empty_element_suffix => '>',
tab_width => 2,
use_wikilinks => 1,
} );
use Text::MultiMarkdown;
my $m = Text::MultiMarkdown->new;
my $html = $m->markdown($text);
use Text::MultiMarkdown;
my $m = Text::MultiMarkdown->new(
empty_element_suffix => '>',
tab_width => 2,
use_wikilinks => 1,
);
my $html = $m->markdown( $text );
=head1 DESCRIPTION
Markdown is a text-to-HTML filter; it translates an easy-to-read /
easy-to-write structured text format into HTML. Markdown's text format
is most similar to that of plain text email, and supports features such
as headers, *emphasis*, code blocks, blockquotes, and links.
Markdown's syntax is designed not as a generic markup language, but
specifically to serve as a front-end to (X)HTML. You can use span-level
HTML tags anywhere in a Markdown document, and you can use block level
HTML tags (like <div> and <table> as well).
This module implements the MultiMarkdown markdown syntax extensions from:
http://fletcherpenney.net/multimarkdown/
=head1 SYNTAX
For more information about (original) Markdown's syntax, see:
http://daringfireball.net/projects/markdown/
This module implements MultiMarkdown, which is an extension to Markdown..
The extension is documented at:
http://fletcherpenney.net/multimarkdown/
and borrows from php-markdown, which lives at:
http://michelf.com/projects/php-markdown/extra/
This documentation is going to be moved/copied into this module for clearer reading in a future release..
=head1 OPTIONS
MultiMarkdown supports a number of options to it's processor which control the behaviour of the output document.
These options can be supplied to the constructor, on in a hash with the individual calls to the markdown method.
See the synopsis for examples of both of the above styles.
The options for the processor are:
=over
=item use_metadata
Controls the metadata options below.
=item strip_metadata
If true, any metadata in the input document is removed from the output document (note - does not take effect in complete document format).
=item empty element suffix
This option can be used to generate normal HTML output. By default, it is ' />', which is xHTML, change to '>' for normal HTML.
=item img_ids
Controls if <img> tags generated have an id attribute. Defaults to true.
Turn off for compatibility with the original markdown.
=item heading_ids
Controls if <hX> tags generated have an id attribute. Defaults to true.
Turn off for compatibility with the original markdown.
=item bibliography_title
The title of the generated bibliography, defaults to 'Bibliography'.
=item tab_width
Controls indent width in the generated markup, defaults to 4
=item disable_tables
If true, this disables the MultiMarkdown table handling.
=item disable_footnotes
If true, this disables the MultiMarkdown footnotes handling.
=item disable_bibliography
If true, this disables the MultiMarkdown bibliography/citation handling.
=back
A number of possible items of metadata can also be supplied as options.
Note that if the use_metadata is true then the metadata in the document will overwrite the settings on command line.
Metadata options supported are:
=over
=item document_format
=item use_wikilinks
=item base_url
=back
=head1 METADATA
MultiMarkdown supports the concept of 'metadata', which allows you to specify a number of formatting options
within the document itself. Metadata should be placed in the top few lines of a file, on value per line as colon separated key/value pairs.
The metadata should be separated from the document with a blank line.
Most metadata keys are also supported as options to the constructor, or options
to the markdown method itself. (Note, as metadata, keys contain space, whereas options the keys are underscore separated.)
You can attach arbitrary metadata to a document, which is output in HTML <META> tags if unknown, see t/11document_format.t for more info.
A list of 'known' metadata keys, and their effects are listed below:
=over
=item document format
If set to 'complete', MultiMarkdown will render an entire xHTML page, otherwise it will render a document fragment
=over
=item css
Sets a CSS file for the file, if in 'complete' document format.
=item title
Sets the page title, if in 'complete' document format.
=back
=item use wikilinks
If set to '1' or 'on', causes links that are WikiWords to automatically be processed into links.
=item base url
This is the base URL for referencing wiki pages. In this is not supplied, all wiki links are relative.
=back
=head1 METHODS
=head2 new
A simple constructor, see the SYNTAX and OPTIONS sections for more information.
=cut
sub new {
my ($class, %p) = @_;
# Default metadata to 1
$p{use_metadata} = 1 unless exists $p{use_metadata};
# Squash value to [01]
$p{use_metadata} = $p{use_metadata} ? 1 : 0;
$p{base_url} ||= ''; # This is the base url to be used for WikiLinks
$p{tab_width} = 4 unless (defined $p{tab_width} and $p{tab_width} =~ m/^\d+$/);
$p{document_format} ||= '';
$p{empty_element_suffix} ||= ' />'; # Change to ">" for HTML output
#$p{heading_ids} = defined $p{heading_ids} ? $p{heading_ids} : 1;
# For use with WikiWords and [[Wiki Links]]
# NOTE: You can use \WikiWord to prevent a WikiWord from being treated as a link
$p{use_wikilinks} = $p{use_wikilinks} ? 1 : 0;
$p{heading_ids} = defined $p{heading_ids} ? $p{heading_ids} : 1;
$p{img_ids} = defined $p{img_ids} ? $p{img_ids} : 1;
$p{bibliography_title} ||= 'Bibliography'; # FIXME - Test and document, can also be in metadata!
my $self = { params => \%p };
bless $self, ref($class) || $class;
return $self;
}
=head2 markdown
The main function as far as the outside world is concerned. See the SYNOPSIS
for details on use.
=cut
sub markdown {
my ( $self, $text, $options ) = @_;
# Detect functional mode, and create an instance for this run..
unless (ref $self) {
if ( $self ne __PACKAGE__ ) {
my $ob = __PACKAGE__->new();
# $self is text, $text is options
return $ob->markdown($self, $text);
}
else {
croak('Calling ' . $self . '->markdown (as a class method) is not supported.');
}
}
$options ||= {};
%$self = (%{ $self->{params} }, %$options, params => $self->{params});
$self->_CleanUpRunData($options);
return $self->_Markdown($text);
}
sub _CleanUpRunData {
my ($self, $options) = @_;
# 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):
$self->{_crossrefs} = {};
$self->{_footnotes} = {};
$self->{_references} = {};
$self->{_used_footnotes} = []; # Why do we need 2 data structures for footnotes? FIXME
$self->{_used_references} = []; # Ditto for references
$self->{_citation_counter} = 0;
$self->{_metadata} = {};
$self->{_attributes} = {}; # Used for extra attributes on links / images.
$self->SUPER::_CleanUpRunData($options);
}
sub _Markdown {
#
# Main function. The order in which other subs are called here is
# essential. Link and image substitutions need to happen before
# _EscapeSpecialChars(), so that any *'s or _'s in the <a>
# and <img> tags get encoded.
#
# Can't think of any good way to make this inherit from the Markdown version as ordering is so important, so I've left it.
my ($self, $text) = @_;
$text = $self->_CleanUpDoc($text);
# MMD only. Strip out MetaData
$text = $self->_ParseMetaData($text) if ($self->{use_metadata} || $self->{strip_metadata});
# Turn block-level HTML blocks into hash entries
$text = $self->_HashHTMLBlocks($text, {interpret_markdown_on_attribute => 1});
$text = $self->_StripLinkDefinitions($text);
# MMD only
$text = $self->_StripMarkdownReferences($text);
$text = $self->_RunBlockGamut($text, {wrap_in_p_tags => 1});
# MMD Only
$text = $self->_DoMarkdownCitations($text) unless $self->{disable_bibliography};
$text = $self->_DoFootnotes($text) unless $self->{disable_footnotes};
$text = $self->_UnescapeSpecialChars($text);
# MMD Only
# This must follow _UnescapeSpecialChars
$text = $self->_UnescapeWikiWords($text);
$text = $self->_FixFootnoteParagraphs($text) unless $self->{disable_footnotes}; # TODO: remove. Doesn't make any difference to test suite pass/failure
$text .= $self->_PrintFootnotes() unless $self->{disable_footnotes};
$text .= $self->_PrintMarkdownBibliography() unless $self->{disable_bibliography};
$text = $self->_ConvertCopyright($text);
# MMD Only
if (lc($self->{document_format}) =~ /^complete\s*$/) {
return $self->_xhtmlMetaData() . "<body>\n" . $text . "\n</body>\n</html>";
}
else {
return $self->_textMetaData() . $text . "\n";
}
}
#
# Routines which are overridden for slightly different behaviour in MultiMarkdown
#
# Delegate to super class, then do wiki links
sub _RunSpanGamut {
my ($self, $text) = @_;
$text = $self->SUPER::_RunSpanGamut($text);
# Process WikiWords
if ($self->_UseWikiLinks()) {
$text = $self->_DoWikiLinks($text);
# And then reprocess anchors and images
# FIXME - This is needed exactly why?
$text = $self->_DoImages($text);
$text = $self->_DoAnchors($text);
}
return $text;
}
# Don't do Wiki Links in Headers, otherwise delegate to super class
# Do tables stright after headers
sub _DoHeaders {
my ($self, $text) = @_;
local $self->{use_wikilinks} = 0;
$text = $self->SUPER::_DoHeaders($text);
# Do tables to populate the table id's for cross-refs
# (but after headers as the tables can contain cross-refs to other things, so we want the header cross-refs)
$text = $self->_DoTables($text);
}
# Generating headers automatically generates X-refs in MultiMarkdown (always)
# Also, by default, you get id attributes added to your headers, you can turn this
# part of the MultiMarkdown behaviour off with the heading_ids flag.
sub _GenerateHeader {
my ($self, $level, $id) = @_;
my $label = $self->{heading_ids} ? $self->_Header2Label($id) : '';
my $header = $self->_RunSpanGamut($id);
if ($label ne '') {
$self->{_crossrefs}{$label} = "#$label";
$self->{_titles}{$label} = $header;
$label = qq{ id="$label"};
}
return "<h$level$label>$header</h$level>\n\n";
}
# Protect Wiki Links in Code Blocks (if wiki links are turned on), then delegate to super class.
sub _EncodeCode {
my ($self, $text) = @_;
if ($self->_UseWikiLinks()) {
$text =~ s/([A-Z]+[a-z\x80-\xff]+[A-Z][A-Za-z\x80-\xff]*)/\\$1/gx;
}
return $self->SUPER::_EncodeCode($text);
}
# Full function pulled out of Text::Markdown as MultiMarkdown supports supplying extra 'attributes' with links and
# images which are then pushed back into the generated HTML, and this needs a different regex. It should be possible
# to extract the just the regex from Text::Markdown, and use that here, but I haven't done so yet.
# Strip footnote definitions at the same time as stripping link definitions.
# Also extract images and then replace them straight back in (code smell!) to be able to cross reference images
sub _StripLinkDefinitions {
#
# Strips link definitions from text, stores the URLs and titles in
# hash references.
#
my ($self, $text) = @_;
$text = $self->_StripFootnoteDefinitions($text) unless $self->{disable_footnotes};
my $less_than_tab = $self->{tab_width} - 1;
# Link defs are in the form: ^[id]: url "optional title"
# FIXME - document attributes here.
while ($text =~ s{
# Pattern altered for MultiMarkdown
# in order to not match citations or footnotes
^[ ]{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
# MultiMarkdown addition for attribute support
\n?
( # Attributes = $4
(?<=\s) # lookbehind for whitespace
(([ \t]*\n)?[ \t]*((\S+=\S+)|(\S+=".*?")))*
)?
[ \t]*
# /addition
(?:\n+|\Z)
}
{}mx) {
$self->{_urls}{lc $1} = $self->_EncodeAmpsAndAngles( $2 ); # Link IDs are case-insensitive
if ($3) {
$self->{_titles}{lc $1} = $3;
$self->{_titles}{lc $1} =~ s/"/"/g;
}
# MultiMarkdown addition "
if ($4) {
$self->{_attributes}{lc $1} = $4;
}
# /addition
}
$text = $self->_GenerateImageCrossRefs($text);
return $text;
}
# Add the extra cross-references to headers that MultiMarkdown supports, and also
# the additional link attributes.
sub _GenerateAnchor {
# FIXME - Fugly, change to named params?
my ($self, $whole_match, $link_text, $link_id, $url, $title, $attributes) = @_;
# Allow automatic cross-references to headers
if (defined $link_id) {
my $label = $self->_Header2Label($link_id);
if (defined $self->{_crossrefs}{$label}) {
$url ||= $self->{_crossrefs}{$label};
}
if ( defined $self->{_titles}{$label} ) {
$title ||= $self->{_titles}{$label};
}
$attributes ||= $self->_DoAttributes($label);
}
return $self->SUPER::_GenerateAnchor($whole_match, $link_text, $link_id, $url, $title, $attributes);
}
# Add the extra cross-references to images that MultiMarkdown supports, and also
# the additional attributes.
sub _GenerateImage {
# FIXME - Fugly, change to named params?
my ($self, $whole_match, $alt_text, $link_id, $url, $title, $attributes) = @_;
if (defined $alt_text && length $alt_text) {
my $label = $self->_Header2Label($alt_text);
$self->{_crossrefs}{$label} = "#$label";
$attributes .= $self->{img_ids} ? qq{ id="$label"} : '';
}
$attributes .= $self->_DoAttributes($link_id) if defined $link_id;
$self->SUPER::_GenerateImage($whole_match, $alt_text, $link_id, $url, $title, $attributes);
}
#
# MultiMarkdown specific routines
#
# FIXME - This is really really ugly!
sub _ParseMetaData {
my ($self, $text) = @_;
my $clean_text = "";
my ($inMetaData, $currentKey) = (1, '');
foreach my $line ( split /\n/, $text ) {
$line =~ /^\s*$/ and $inMetaData = 0 and $clean_text .= $line and next;
if ($inMetaData) {
next unless $self->{use_metadata}; # We can come in here as use_metadata => 0, strip_metadata => 1
if ($line =~ /^([a-zA-Z0-9][0-9a-zA-Z _-]+?):\s*(.*)$/ ) {
$currentKey = $1;
$currentKey =~ s/ / /g;
$self->{_metadata}{$currentKey} = defined $2 ? $2 : '';
if (lc($currentKey) eq "format") {
$self->{document_format} = $self->{_metadata}{$currentKey};
}
if (lc($currentKey) eq "base url") {
$self->{base_url} = $self->{_metadata}{$currentKey};
}
if (lc($currentKey) eq "bibliography title") {
$self->{bibliography_title} = $self->{_metadata}{$currentKey};
$self->{bibliography_title} =~ s/\s*$//;
}
}
else {
if ($currentKey eq "") {
# No metadata present
$clean_text .= "$line\n";
$inMetaData = 0;
next;
}
if ($line =~ /^\s*(.+)$/ ) {
$self->{_metadata}{$currentKey} .= "\n$1";
}
}
}
else {
$clean_text .= "$line\n";
}
}
# Recheck for leading blank lines
$clean_text =~ s/^\n+//s;
return $clean_text;
}
# FIXME - This is really ugly, why do we match stuff and substitute it with the thing we just matched?
sub _GenerateImageCrossRefs {
my ($self, $text) = @_;
#
# First, handle reference-style labeled images: ![alt text][id]
#
$text =~ s{
( # wrap whole match in $1
!\[
(.*?) # alt text = $2
\]
[ ]? # one optional space
(?:\n[ ]*)? # one optional newline followed by spaces
\[
(.*?) # id = $3
\]
)
}{
my $whole_match = $1;
my $alt_text = $2;
my $link_id = lc $3;
if ($link_id eq "") {
$link_id = lc $alt_text; # for shortcut links like ![this][].
}
$alt_text =~ s/"/"/g;
if (defined $self->{_urls}{$link_id}) {
my $label = $self->_Header2Label($alt_text);
$self->{_crossrefs}{$label} = "#$label";
}
$whole_match;
}xsge;
#
# Next, handle inline images: ![alt text](url "optional title")
# Don't forget: encode * and _
$text =~ s{
( # wrap whole match in $1
!\[
(.*?) # alt text = $2
\]
\( # literal paren
[ \t]*
<?(\S+?)>? # src url = $3
[ \t]*
( # $4
(['"]) # quote char = $5
(.*?) # title = $6
\5 # matching quote
[ \t]*
)? # title is optional
\)
)
}{
my $result;
my $whole_match = $1;
my $alt_text = $2;
$alt_text =~ s/"/"/g;
my $label = $self->_Header2Label($alt_text);
$self->{_crossrefs}{$label} = "#$label";
$whole_match;
}xsge;
return $text;
}
sub _StripFootnoteDefinitions {
my ($self, $text) = @_;
my $less_than_tab = $self->{tab_width} - 1;
while ($text =~ s{
\n\[\^([^\n]+?)\]\:[ \t]*# id = $1
\n?
(.*?)\n{1,2} # end at new paragraph
((?=\n[ ]{0,$less_than_tab}\S)|\Z) # Lookahead for non-space at line-start, or end of doc
}
{\n}sx)
{
my $id = $1;
my $footnote = "$2\n";
$footnote =~ s/^[ ]{0,$self->{tab_width}}//gm;
$self->{_footnotes}{$self->_Id2Footnote($id)} = $footnote;
}
return $text;
}
sub _DoFootnotes {
my ($self, $text) = @_;
return '' unless length $text;
# First, run routines that get skipped in footnotes
foreach my $label (sort keys %{ $self->{_footnotes} }) {
my $footnote = $self->_RunBlockGamut($self->{_footnotes}{$label}, {wrap_in_p_tags => 1});
$footnote = $self->_UnescapeSpecialChars($footnote);
$footnote = $self->_DoMarkdownCitations($footnote);
$self->{_footnotes}{$label} = $footnote;
}
my $footnote_counter = 0;
$text =~ s{
\[\^(.*?)\] # id = $1
}{
my $result = '';
my $id = $self->_Id2Footnote($1);
if (defined $self->{_footnotes}{$id} ) {
$footnote_counter++;
if ($self->{_footnotes}{$id} =~ /^glossary:/i) {
$result = qq{<a href="#fn:$id" id="fnref:$id" class="footnote glossary">$footnote_counter</a>};
}
else {
$result = qq{<a href="#fn:$id" id="fnref:$id" class="footnote">$footnote_counter</a>};
}
push (@{ $self->{_used_footnotes} }, $id);
}
$result;
}xsge;
return $text;
}
# TODO: remove. Doesn't make any difference to test suite pass/failure
sub _FixFootnoteParagraphs {
my ($self, $text) = @_;
$text =~ s(^<p></footnote>)(</footnote>)gm;
return $text;
}
sub _PrintFootnotes {
my ($self) = @_;
my $footnote_counter = 0;
my $result;
foreach my $id (@{ $self->{_used_footnotes} }) {
$footnote_counter++;
my $footnote = $self->{_footnotes}{$id};
$footnote =~ s/(<\/(p(re)?|ol|ul)>)$//;
my $footnote_closing_tag = $1;
$footnote_closing_tag = '' if !defined $footnote_closing_tag;
if ($footnote =~ s/^glossary:\s*//i) {
# Add some formatting for glossary entries
$footnote =~ s{
^(.*?) # $1 = term
\s*
(?:\(([^\(\)]*)\)[^\n]*)? # $2 = optional sort key
\n
}{
my $glossary = qq{<span class="glossary name">$1</span>};
if ($2) {
$glossary.= qq{<span class="glossary sort" style="display:none">$2</span>};
};
$glossary . q{:<p>};
}egsx;
$result .= qq{<li id="fn:$id">$footnote<a href="#fnref:$id" class="reversefootnote"> ↩</a>$footnote_closing_tag</li>\n\n};
}
else {
$result .= qq{<li id="fn:$id">$footnote<a href="#fnref:$id" class="reversefootnote"> ↩</a>$footnote_closing_tag</li>\n\n};
}
}
if ($footnote_counter > 0) {
$result = qq[\n\n<div class="footnotes">\n<hr$self->{empty_element_suffix}\n<ol>\n\n] . $result . "</ol>\n</div>";
}
else {
$result = "";
}
return $result;
}
sub _Header2Label {
my ($self, $header) = @_;
my $label = lc $header;
$label =~ s/[^A-Za-z0-9:_.-]//g; # Strip illegal characters
while ($label =~ s/^[^A-Za-z]//g)
{}; # Strip illegal leading characters
return $label;
}
sub _Id2Footnote {
# Since we prepend "fn:", we can allow leading digits in footnotes
my ($self, $id) = @_;
my $footnote = lc $id;
$footnote =~ s/[^A-Za-z0-9:_.-]//g; # Strip illegal characters
return $footnote;
}
sub _xhtmlMetaData {
my ($self) = @_;
# FIXME: Should not assume encoding
my $result; # FIXME: This breaks some things in IE 6- = qq{<?xml version="1.0" encoding="UTF-8" ?>\n};
# This screws up xsltproc - make sure to use `-nonet -novalid` if you
# have difficulty
$result .= qq{<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">\n};
$result.= "<html>\n\t<head>\n";
foreach my $key (sort keys %{$self->{_metadata}} ) {
if (lc($key) eq "title") {
$result.= "\t\t<title>$self->{_metadata}{$key}</title>\n";
}
elsif (lc($key) eq "css") {
$result.= qq[\t\t<link type="text/css" rel="stylesheet" href="$self->{_metadata}{$key}"$self->{empty_element_suffix}\n];
}
else {
$result.= qq[\t\t<meta name="$key" content="$self->{_metadata}{$key}"$self->{empty_element_suffix}\n];
}
}
$result.= "\t</head>\n";
return $result;
}
sub _textMetaData {
my ($self) = @_;
my $result = "";
return $result if $self->{strip_metadata};
foreach my $key (sort keys %{$self->{_metadata}} ) {
$result .= "$key: $self->{_metadata}{$key}\n";
}
$result =~ s/\s*\n/<br$self->{empty_element_suffix}\n/g;
if ($result ne "") {
$result.= "\n";
}
return $result;
}
sub _UseWikiLinks {
my ($self) = @_;
return 1 if $self->{use_wikilinks};
my ($k) = grep { /use wikilinks/i } keys %{$self->{_metadata}};
return unless $k;
return 1 if $self->{_metadata}{$k};
return;
}
sub _CreateWikiLink {
my ($self, $title) = @_;
my $id = $title;
$id =~ s/ /_/g;
$id =~ s/__+/_/g;
$id =~ s/^_//g;
$id =~ s/_$//;
$title =~ s/_/ /g;
return "[$title](" . $self->{base_url} . "$id)";
}
sub _DoWikiLinks {
my ($self, $text) = @_;
my $WikiWord = '[A-Z]+[a-z\x80-\xff]+[A-Z][A-Za-z\x80-\xff]*';
my $FreeLinkPattern = "([-,.()' _0-9A-Za-z\x80-\xff]+)";
if ($self->_UseWikiLinks()) {
# FreeLinks
$text =~ s{
\[\[($FreeLinkPattern)\]\]
}{
my $label = $1;
$label =~ s{
([\s\>])($WikiWord)
}{
$1 ."\\" . $2
}xsge;
$self->_CreateWikiLink($label)
}xsge;
# WikiWords
$text =~ s{
([\s])($WikiWord)
}{
$1 . $self->_CreateWikiLink($2)
}xsge;
# Catch WikiWords at beginning of text
$text =~ s{^($WikiWord)
}{
$self->_CreateWikiLink($1)
}xse;
}
return $text;
}
sub _UnescapeWikiWords {
my ($self, $text) = @_;
my $WikiWord = '[A-Z]+[a-z\x80-\xff]+[A-Z][A-Za-z\x80-\xff]*';
# Unescape escaped WikiWords
$text =~ s/(?<=\B)\\($WikiWord)/$1/g;
return $text;
}
sub _DoTables {
my ($self, $text) = @_;
return $text if $self->{disable_tables};
my $less_than_tab = $self->{tab_width} - 1;
# Algorithm inspired by PHP Markdown Extra's
# <http://www.michelf.com/projects/php-markdown/>
# Reusable regexp's to match table
my $line_start = qr{
[ ]{0,$less_than_tab}
}mx;
my $table_row = qr{
[^\n]*?\|[^\n]*?\n
}mx;
my $first_row = qr{
$line_start
\S+.*?\|.*?\n
}mx;
my $table_rows = qr{
(\n?$table_row)
}mx;
my $table_caption = qr{
$line_start
\[.*?\][ \t]*\n
}mx;
my $table_divider = qr{
$line_start
[\|\-\:\.][ \-\|\:\.]* \| [ \-\|\:\.]*
}mx;
my $whole_table = qr{
($table_caption)? # Optional caption
($first_row # First line must start at beginning
($table_row)*?)? # Header Rows
$table_divider # Divider/Alignment definitions
$table_rows+ # Body Rows
($table_caption)? # Optional caption
}mx;
# Find whole tables, then break them up and process them
$text =~ s{
^($whole_table) # Whole table in $1
(\n|\Z) # End of file or 2 blank lines
}{
my $table = $1;
my $result = "<table>\n";
my @alignments;
my $use_row_header = 0;
# Add Caption, if present
if ($table =~ s/^$line_start\[\s*(.*?)\s*\](\[\s*(.*?)\s*\])?[ \t]*$//m) {
if (defined $3) {
# add caption id to cross-ref list
my $table_id = $self->_Header2Label($3);
$result .= qq{<caption id="$table_id">} . $self->_RunSpanGamut($1). "</caption>\n";
$self->{_crossrefs}{$table_id} = "#$table_id";
$self->{_titles}{$table_id} = "$1";
}
else {
$result .= "<caption>" . $self->_RunSpanGamut($1). "</caption>\n";
}
}
# If a second "caption" is present, treat it as a summary
# However, this is not valid in XHTML 1.0 Strict
# But maybe in future
# A summary might be longer than one line
if ($table =~ s/\n$line_start\[\s*(.*?)\s*\][ \t]*\n/\n/s) {
# $result .= "<summary>" . $self->_RunSpanGamut($1) . "</summary>\n";
}
# Now, divide table into header, alignment, and body
# First, add leading \n in case there is no header
$table = "\n" . $table;
# Need to be greedy
$table =~ s/\n($table_divider)\n(($table_rows)+)//s;
my $alignment_string = $1;
my $body = $2;
# Process column alignment
while ($alignment_string =~ /\|?\s*(.+?)\s*(\||\Z)/gs) {
my $cell = $self->_RunSpanGamut($1);
if ($cell =~ /\:$/) {
if ($cell =~ /^\:/) {
$result .= qq[<col align="center"$self->{empty_element_suffix}\n];
push(@alignments,"center");
}
else {
$result .= qq[<col align="right"$self->{empty_element_suffix}\n];
push(@alignments,"right");
}
}
else {
if ($cell =~ /^\:/) {
$result .= qq[<col align="left"$self->{empty_element_suffix}\n];
push(@alignments,"left");
}
else {
if (($cell =~ /^\./) || ($cell =~ /\.$/)) {
$result .= qq[<col align="char"$self->{empty_element_suffix}\n];
push(@alignments,"char");
}
else {
$result .= "<col$self->{empty_element_suffix}\n";
push(@alignments,"");
}
}