1448 lines
35 KiB
Perl
Executable File
1448 lines
35 KiB
Perl
Executable File
#!/usr/bin/env perl
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#
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# Markdown -- A text-to-HTML conversion tool for web writers
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#
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# Copyright (c) 2004 John Gruber
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# <http://daringfireball.net/projects/markdown/>
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#
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package Markdown;
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require 5.006_000;
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use strict;
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use warnings;
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use Digest::MD5 qw(md5_hex);
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use vars qw($VERSION);
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$VERSION = '1.0.1';
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# Tue 14 Dec 2004
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## Disabled; causes problems under Perl 5.6.1:
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# use utf8;
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# binmode( STDOUT, ":utf8" ); # c.f.: http://acis.openlib.org/dev/perl-unicode-struggle.html
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#
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# Global default settings:
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#
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my $g_empty_element_suffix = " />"; # Change to ">" for HTML output
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my $g_tab_width = 4;
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#
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# Globals:
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#
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# Regex to match balanced [brackets]. See Friedl's
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# "Mastering Regular Expressions", 2nd Ed., pp. 328-331.
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my $g_nested_brackets;
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$g_nested_brackets = qr{
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(?> # Atomic matching
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[^\[\]]+ # Anything other than brackets
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\[
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(??{ $g_nested_brackets }) # Recursive set of nested brackets
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\]
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)*
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}x;
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# Table of hash values for escaped characters:
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my %g_escape_table;
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foreach my $char (split //, '\\`*_{}[]()>#+-.!') {
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$g_escape_table{$char} = md5_hex($char);
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}
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# Global hashes, used by various utility routines
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my %g_urls;
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my %g_titles;
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my %g_html_blocks;
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# Used to track when we're inside an ordered or unordered list
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# (see _ProcessListItems() for details):
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my $g_list_level = 0;
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#### Blosxom plug-in interface ##########################################
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# Set $g_blosxom_use_meta to 1 to use Blosxom's meta plug-in to determine
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# which posts Markdown should process, using a "meta-markup: markdown"
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# header. If it's set to 0 (the default), Markdown will process all
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# entries.
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my $g_blosxom_use_meta = 0;
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sub start { 1; }
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sub story {
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my($pkg, $path, $filename, $story_ref, $title_ref, $body_ref) = @_;
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if ( (! $g_blosxom_use_meta) or
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(defined($meta::markup) and ($meta::markup =~ /^\s*markdown\s*$/i))
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){
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$$body_ref = Markdown($$body_ref);
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}
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1;
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}
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#### Movable Type plug-in interface #####################################
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eval {require MT}; # Test to see if we're running in MT.
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unless ($@) {
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require MT;
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import MT;
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require MT::Template::Context;
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import MT::Template::Context;
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eval {require MT::Plugin}; # Test to see if we're running >= MT 3.0.
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unless ($@) {
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require MT::Plugin;
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import MT::Plugin;
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my $plugin = new MT::Plugin({
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name => "Markdown",
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description => "A plain-text-to-HTML formatting plugin. (Version: $VERSION)",
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doc_link => 'http://daringfireball.net/projects/markdown/'
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});
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MT->add_plugin( $plugin );
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}
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MT::Template::Context->add_container_tag(MarkdownOptions => sub {
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my $ctx = shift;
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my $args = shift;
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my $builder = $ctx->stash('builder');
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my $tokens = $ctx->stash('tokens');
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if (defined ($args->{'output'}) ) {
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$ctx->stash('markdown_output', lc $args->{'output'});
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}
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defined (my $str = $builder->build($ctx, $tokens) )
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or return $ctx->error($builder->errstr);
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$str; # return value
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});
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MT->add_text_filter('markdown' => {
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label => 'Markdown',
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docs => 'http://daringfireball.net/projects/markdown/',
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on_format => sub {
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my $text = shift;
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my $ctx = shift;
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my $raw = 0;
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if (defined $ctx) {
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my $output = $ctx->stash('markdown_output');
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if (defined $output && $output =~ m/^html/i) {
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$g_empty_element_suffix = ">";
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$ctx->stash('markdown_output', '');
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}
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elsif (defined $output && $output eq 'raw') {
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$raw = 1;
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$ctx->stash('markdown_output', '');
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}
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else {
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$raw = 0;
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$g_empty_element_suffix = " />";
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}
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}
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$text = $raw ? $text : Markdown($text);
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$text;
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},
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});
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# If SmartyPants is loaded, add a combo Markdown/SmartyPants text filter:
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my $smartypants;
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{
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no warnings "once";
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$smartypants = $MT::Template::Context::Global_filters{'smarty_pants'};
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}
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if ($smartypants) {
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MT->add_text_filter('markdown_with_smartypants' => {
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label => 'Markdown With SmartyPants',
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docs => 'http://daringfireball.net/projects/markdown/',
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on_format => sub {
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my $text = shift;
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my $ctx = shift;
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if (defined $ctx) {
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my $output = $ctx->stash('markdown_output');
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if (defined $output && $output eq 'html') {
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$g_empty_element_suffix = ">";
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}
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else {
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$g_empty_element_suffix = " />";
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}
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}
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$text = Markdown($text);
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$text = $smartypants->($text, '1');
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},
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});
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}
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}
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else {
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#### BBEdit/command-line text filter interface ##########################
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# Needs to be hidden from MT (and Blosxom when running in static mode).
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# We're only using $blosxom::version once; tell Perl not to warn us:
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no warnings 'once';
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unless ( defined($blosxom::version) ) {
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use warnings;
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#### Check for command-line switches: #################
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my %cli_opts;
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use Getopt::Long;
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Getopt::Long::Configure('pass_through');
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GetOptions(\%cli_opts,
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'version',
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'shortversion',
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'html4tags',
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);
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if ($cli_opts{'version'}) { # Version info
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print "\nThis is Markdown, version $VERSION.\n";
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print "Copyright 2004 John Gruber\n";
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print "http://daringfireball.net/projects/markdown/\n\n";
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exit 0;
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}
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if ($cli_opts{'shortversion'}) { # Just the version number string.
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print $VERSION;
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exit 0;
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}
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if ($cli_opts{'html4tags'}) { # Use HTML tag style instead of XHTML
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$g_empty_element_suffix = ">";
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}
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#### Process incoming text: ###########################
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my $text;
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{
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local $/; # Slurp the whole file
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$text = <>;
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}
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print Markdown($text);
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}
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}
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sub Markdown {
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#
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# Main function. The order in which other subs are called here is
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# essential. Link and image substitutions need to happen before
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# _EscapeSpecialChars(), so that any *'s or _'s in the <a>
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# and <img> tags get encoded.
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#
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my $text = shift;
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# Clear the global hashes. If we don't clear these, you get conflicts
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# from other articles when generating a page which contains more than
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# one article (e.g. an index page that shows the N most recent
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# articles):
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%g_urls = ();
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%g_titles = ();
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%g_html_blocks = ();
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# Standardize line endings:
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$text =~ s{\r\n}{\n}g; # DOS to Unix
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$text =~ s{\r}{\n}g; # Mac to Unix
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# Make sure $text ends with a couple of newlines:
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$text .= "\n\n";
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# Convert all tabs to spaces.
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$text = _Detab($text);
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# Strip any lines consisting only of spaces and tabs.
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# This makes subsequent regexen easier to write, because we can
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# match consecutive blank lines with /\n+/ instead of something
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# contorted like /[ \t]*\n+/ .
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$text =~ s/^[ \t]+$//mg;
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# Turn block-level HTML blocks into hash entries
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$text = _HashHTMLBlocks($text);
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# Strip link definitions, store in hashes.
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$text = _StripLinkDefinitions($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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sub _StripLinkDefinitions {
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#
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# Strips link definitions from text, stores the URLs and titles in
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# hash references.
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#
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my $text = shift;
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my $less_than_tab = $g_tab_width - 1;
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# Link defs are in the form: ^[id]: url "optional title"
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while ($text =~ s{
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^[ ]{0,$less_than_tab}\[(.+)\]: # 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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(?<=\s) # lookbehind for whitespace
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["(]
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(.+?) # title = $3
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[")]
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[ \t]*
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)? # title is optional
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(?:\n+|\Z)
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}
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{}mx) {
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$g_urls{lc $1} = _EncodeAmpsAndAngles( $2 ); # Link IDs are case-insensitive
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if ($3) {
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$g_titles{lc $1} = $3;
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$g_titles{lc $1} =~ s/"/"/g;
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}
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}
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return $text;
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}
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sub _HashHTMLBlocks {
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my $text = shift;
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my $less_than_tab = $g_tab_width - 1;
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# Hashify HTML blocks:
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# We only want to do this for block-level HTML tags, such as headers,
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# lists, and tables. That's because we still want to wrap <p>s around
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# "paragraphs" that are wrapped in non-block-level tags, such as anchors,
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# phrase emphasis, and spans. The list of tags we're looking for is
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# hard-coded:
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my $block_tags_a = qr/p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del/;
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my $block_tags_b = qr/p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math/;
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# First, look for nested blocks, e.g.:
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# <div>
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# <div>
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# tags for inner block must be indented.
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# </div>
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# </div>
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#
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# The outermost tags must start at the left margin for this to match, and
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# the inner nested divs must be indented.
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# We need to do this before the next, more liberal match, because the next
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# match will start at the first `<div>` and stop at the first `</div>`.
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$text =~ s{
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( # save in $1
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^ # start of line (with /m)
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<($block_tags_a) # 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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}{
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my $key = md5_hex($1);
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$g_html_blocks{$key} = $1;
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"\n\n" . $key . "\n\n";
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}egmx;
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#
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# Now match more liberally, simply from `\n<tag>` to `</tag>\n`
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#
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$text =~ s{
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( # save in $1
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^ # start of line (with /m)
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<($block_tags_b) # 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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}{
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my $key = md5_hex($1);
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$g_html_blocks{$key} = $1;
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"\n\n" . $key . "\n\n";
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}egmx;
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# Special case just for <hr />. It was easier to make a special case than
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# to make the other regex more complicated.
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$text =~ s{
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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 $1
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[ ]{0,$less_than_tab}
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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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[ \t]*
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(?=\n{2,}|\Z) # followed by a blank line or end of document
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)
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}{
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my $key = md5_hex($1);
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$g_html_blocks{$key} = $1;
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"\n\n" . $key . "\n\n";
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}egx;
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# Special case for standalone HTML comments:
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$text =~ s{
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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 $1
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[ ]{0,$less_than_tab}
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(?s:
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<!
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(--.*?--\s*)+
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>
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)
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[ \t]*
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(?=\n{2,}|\Z) # followed by a blank line or end of document
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)
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}{
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my $key = md5_hex($1);
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$g_html_blocks{$key} = $1;
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"\n\n" . $key . "\n\n";
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}egx;
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return $text;
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}
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sub _RunBlockGamut {
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#
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# These are all the transformations that form block-level
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# tags like paragraphs, headers, and list items.
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#
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my $text = shift;
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$text = _DoHeaders($text);
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# Do Horizontal Rules:
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$text =~ s{^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$}{\n<hr$g_empty_element_suffix\n}gmx;
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$text =~ s{^[ ]{0,2}([ ]? -[ ]?){3,}[ \t]*$}{\n<hr$g_empty_element_suffix\n}gmx;
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$text =~ s{^[ ]{0,2}([ ]? _[ ]?){3,}[ \t]*$}{\n<hr$g_empty_element_suffix\n}gmx;
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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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# We already ran _HashHTMLBlocks() before, in Markdown(), but that
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# was to escape raw HTML in the original Markdown source. This time,
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# we're escaping the markup we've just created, so that we don't wrap
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# <p> tags around block-level tags.
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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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sub _RunSpanGamut {
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#
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# These are all the transformations that occur *within* block-level
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# tags like paragraphs, headers, and list items.
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#
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my $text = shift;
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$text = _DoCodeSpans($text);
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$text = _EscapeSpecialChars($text);
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# Process anchor and image tags. Images must come first,
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# because ![foo][f] looks like an anchor.
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$text = _DoImages($text);
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$text = _DoAnchors($text);
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# Make links out of things like `<http://example.com/>`
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# Must come after _DoAnchors(), because you can use < and >
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# delimiters in inline links like [this](<url>).
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$text = _DoAutoLinks($text);
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$text = _EncodeAmpsAndAngles($text);
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$text = _DoItalicsAndBold($text);
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# Do hard breaks:
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$text =~ s/ {2,}\n/ <br$g_empty_element_suffix\n/g;
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return $text;
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}
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sub _EscapeSpecialChars {
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my $text = shift;
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my $tokens ||= _TokenizeHTML($text);
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$text = ''; # rebuild $text from the tokens
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# my $in_pre = 0; # Keep track of when we're inside <pre> or <code> tags.
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# my $tags_to_skip = qr!<(/?)(?:pre|code|kbd|script|math)[\s>]!;
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foreach my $cur_token (@$tokens) {
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if ($cur_token->[0] eq "tag") {
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# Within tags, encode * and _ so they don't conflict
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# with their use in Markdown for italics and strong.
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# We're replacing each such character with its
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# corresponding MD5 checksum value; this is likely
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# overkill, but it should prevent us from colliding
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# with the escape values by accident.
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$cur_token->[1] =~ s! \* !$g_escape_table{'*'}!gx;
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$cur_token->[1] =~ s! _ !$g_escape_table{'_'}!gx;
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$text .= $cur_token->[1];
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} else {
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my $t = $cur_token->[1];
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$t = _EncodeBackslashEscapes($t);
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$text .= $t;
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}
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}
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return $text;
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}
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sub _DoAnchors {
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#
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# Turn Markdown link shortcuts into XHTML <a> tags.
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#
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my $text = shift;
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|
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#
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# First, handle reference-style links: [link text] [id]
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#
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$text =~ s{
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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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\[
|
|
(.*?) # id = $3
|
|
\]
|
|
)
|
|
}{
|
|
my $result;
|
|
my $whole_match = $1;
|
|
my $link_text = $2;
|
|
my $link_id = lc $3;
|
|
|
|
if ($link_id eq "") {
|
|
$link_id = lc $link_text; # for shortcut links like [this][].
|
|
}
|
|
|
|
if (defined $g_urls{$link_id}) {
|
|
my $url = $g_urls{$link_id};
|
|
$url =~ s! \* !$g_escape_table{'*'}!gx; # We've got to encode these to avoid
|
|
$url =~ s! _ !$g_escape_table{'_'}!gx; # conflicting with italics/bold.
|
|
$result = "<a href=\"$url\"";
|
|
if ( defined $g_titles{$link_id} ) {
|
|
my $title = $g_titles{$link_id};
|
|
$title =~ s! \* !$g_escape_table{'*'}!gx;
|
|
$title =~ s! _ !$g_escape_table{'_'}!gx;
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
$result .= ">$link_text</a>";
|
|
}
|
|
else {
|
|
$result = $whole_match;
|
|
}
|
|
$result;
|
|
}xsge;
|
|
|
|
#
|
|
# Next, inline-style links: [link text](url "optional title")
|
|
#
|
|
$text =~ s{
|
|
( # wrap whole match in $1
|
|
\[
|
|
($g_nested_brackets) # link text = $2
|
|
\]
|
|
\( # literal paren
|
|
[ \t]*
|
|
<?(.*?)>? # href = $3
|
|
[ \t]*
|
|
( # $4
|
|
(['"]) # quote char = $5
|
|
(.*?) # Title = $6
|
|
\5 # matching quote
|
|
)? # title is optional
|
|
\)
|
|
)
|
|
}{
|
|
my $result;
|
|
my $whole_match = $1;
|
|
my $link_text = $2;
|
|
my $url = $3;
|
|
my $title = $6;
|
|
|
|
$url =~ s! \* !$g_escape_table{'*'}!gx; # We've got to encode these to avoid
|
|
$url =~ s! _ !$g_escape_table{'_'}!gx; # conflicting with italics/bold.
|
|
$result = "<a href=\"$url\"";
|
|
|
|
if (defined $title) {
|
|
$title =~ s/"/"/g;
|
|
$title =~ s! \* !$g_escape_table{'*'}!gx;
|
|
$title =~ s! _ !$g_escape_table{'_'}!gx;
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
|
|
$result .= ">$link_text</a>";
|
|
|
|
$result;
|
|
}xsge;
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
sub _DoImages {
|
|
#
|
|
# Turn Markdown image shortcuts into <img> tags.
|
|
#
|
|
my $text = shift;
|
|
|
|
#
|
|
# 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 $result;
|
|
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 $g_urls{$link_id}) {
|
|
my $url = $g_urls{$link_id};
|
|
$url =~ s! \* !$g_escape_table{'*'}!gx; # We've got to encode these to avoid
|
|
$url =~ s! _ !$g_escape_table{'_'}!gx; # conflicting with italics/bold.
|
|
$result = "<img src=\"$url\" alt=\"$alt_text\"";
|
|
if (defined $g_titles{$link_id}) {
|
|
my $title = $g_titles{$link_id};
|
|
$title =~ s! \* !$g_escape_table{'*'}!gx;
|
|
$title =~ s! _ !$g_escape_table{'_'}!gx;
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
$result .= $g_empty_element_suffix;
|
|
}
|
|
else {
|
|
# If there's no such link ID, leave intact:
|
|
$result = $whole_match;
|
|
}
|
|
|
|
$result;
|
|
}xsge;
|
|
|
|
#
|
|
# Next, handle inline images: 
|
|
# 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;
|
|
my $url = $3;
|
|
my $title = '';
|
|
if (defined($6)) {
|
|
$title = $6;
|
|
}
|
|
|
|
$alt_text =~ s/"/"/g;
|
|
$title =~ s/"/"/g;
|
|
$url =~ s! \* !$g_escape_table{'*'}!gx; # We've got to encode these to avoid
|
|
$url =~ s! _ !$g_escape_table{'_'}!gx; # conflicting with italics/bold.
|
|
$result = "<img src=\"$url\" alt=\"$alt_text\"";
|
|
if (defined $title) {
|
|
$title =~ s! \* !$g_escape_table{'*'}!gx;
|
|
$title =~ s! _ !$g_escape_table{'_'}!gx;
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
$result .= $g_empty_element_suffix;
|
|
|
|
$result;
|
|
}xsge;
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
sub _DoHeaders {
|
|
my $text = shift;
|
|
|
|
# Setext-style headers:
|
|
# Header 1
|
|
# ========
|
|
#
|
|
# Header 2
|
|
# --------
|
|
#
|
|
$text =~ s{ ^(.+)[ \t]*\n=+[ \t]*\n+ }{
|
|
"<h1>" . _RunSpanGamut($1) . "</h1>\n\n";
|
|
}egmx;
|
|
|
|
$text =~ s{ ^(.+)[ \t]*\n-+[ \t]*\n+ }{
|
|
"<h2>" . _RunSpanGamut($1) . "</h2>\n\n";
|
|
}egmx;
|
|
|
|
|
|
# atx-style headers:
|
|
# # Header 1
|
|
# ## Header 2
|
|
# ## Header 2 with closing hashes ##
|
|
# ...
|
|
# ###### Header 6
|
|
#
|
|
$text =~ s{
|
|
^(\#{1,6}) # $1 = string of #'s
|
|
[ \t]*
|
|
(.+?) # $2 = Header text
|
|
[ \t]*
|
|
\#* # optional closing #'s (not counted)
|
|
\n+
|
|
}{
|
|
my $h_level = length($1);
|
|
"<h$h_level>" . _RunSpanGamut($2) . "</h$h_level>\n\n";
|
|
}egmx;
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
sub _DoLists {
|
|
#
|
|
# Form HTML ordered (numbered) and unordered (bulleted) lists.
|
|
#
|
|
my $text = shift;
|
|
my $less_than_tab = $g_tab_width - 1;
|
|
|
|
# Re-usable patterns to match list item bullets and number markers:
|
|
my $marker_ul = qr/[*+-]/;
|
|
my $marker_ol = qr/\d+[.]/;
|
|
my $marker_any = qr/(?:$marker_ul|$marker_ol)/;
|
|
|
|
# Re-usable pattern to match any entirel ul or ol list:
|
|
my $whole_list = qr{
|
|
( # $1 = whole list
|
|
( # $2
|
|
[ ]{0,$less_than_tab}
|
|
(${marker_any}) # $3 = first list item marker
|
|
[ \t]+
|
|
)
|
|
(?s:.+?)
|
|
( # $4
|
|
\z
|
|
|
|
|
\n{2,}
|
|
(?=\S)
|
|
(?! # Negative lookahead for another list item marker
|
|
[ \t]*
|
|
${marker_any}[ \t]+
|
|
)
|
|
)
|
|
)
|
|
}mx;
|
|
|
|
# We use a different prefix before nested lists than top-level lists.
|
|
# See extended comment in _ProcessListItems().
|
|
#
|
|
# Note: There's a bit of duplication here. My original implementation
|
|
# created a scalar regex pattern as the conditional result of the test on
|
|
# $g_list_level, and then only ran the $text =~ s{...}{...}egmx
|
|
# substitution once, using the scalar as the pattern. This worked,
|
|
# everywhere except when running under MT on my hosting account at Pair
|
|
# Networks. There, this caused all rebuilds to be killed by the reaper (or
|
|
# perhaps they crashed, but that seems incredibly unlikely given that the
|
|
# same script on the same server ran fine *except* under MT. I've spent
|
|
# more time trying to figure out why this is happening than I'd like to
|
|
# admit. My only guess, backed up by the fact that this workaround works,
|
|
# is that Perl optimizes the substition when it can figure out that the
|
|
# pattern will never change, and when this optimization isn't on, we run
|
|
# afoul of the reaper. Thus, the slightly redundant code to that uses two
|
|
# static s/// patterns rather than one conditional pattern.
|
|
|
|
if ($g_list_level) {
|
|
$text =~ s{
|
|
^
|
|
$whole_list
|
|
}{
|
|
my $list = $1;
|
|
my $list_type = ($3 =~ m/$marker_ul/) ? "ul" : "ol";
|
|
# Turn double returns into triple returns, so that we can make a
|
|
# paragraph for the last item in a list, if necessary:
|
|
$list =~ s/\n{2,}/\n\n\n/g;
|
|
my $result = _ProcessListItems($list, $marker_any);
|
|
$result = "<$list_type>\n" . $result . "</$list_type>\n";
|
|
$result;
|
|
}egmx;
|
|
}
|
|
else {
|
|
$text =~ s{
|
|
(?:(?<=\n\n)|\A\n?)
|
|
$whole_list
|
|
}{
|
|
my $list = $1;
|
|
my $list_type = ($3 =~ m/$marker_ul/) ? "ul" : "ol";
|
|
# Turn double returns into triple returns, so that we can make a
|
|
# paragraph for the last item in a list, if necessary:
|
|
$list =~ s/\n{2,}/\n\n\n/g;
|
|
my $result = _ProcessListItems($list, $marker_any);
|
|
$result = "<$list_type>\n" . $result . "</$list_type>\n";
|
|
$result;
|
|
}egmx;
|
|
}
|
|
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
sub _ProcessListItems {
|
|
#
|
|
# Process the contents of a single ordered or unordered list, splitting it
|
|
# into individual list items.
|
|
#
|
|
|
|
my $list_str = shift;
|
|
my $marker_any = shift;
|
|
|
|
|
|
# The $g_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.".
|
|
|
|
$g_list_level++;
|
|
|
|
# trim trailing blank lines:
|
|
$list_str =~ s/\n{2,}\z/\n/;
|
|
|
|
|
|
$list_str =~ s{
|
|
(\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]+))
|
|
}{
|
|
my $item = $4;
|
|
my $leading_line = $1;
|
|
my $leading_space = $2;
|
|
|
|
if ($leading_line or ($item =~ m/\n{2,}/)) {
|
|
$item = _RunBlockGamut(_Outdent($item));
|
|
}
|
|
else {
|
|
# Recursion for sub-lists:
|
|
$item = _DoLists(_Outdent($item));
|
|
chomp $item;
|
|
$item = _RunSpanGamut($item);
|
|
}
|
|
|
|
"<li>" . $item . "</li>\n";
|
|
}egmx;
|
|
|
|
$g_list_level--;
|
|
return $list_str;
|
|
}
|
|
|
|
|
|
|
|
sub _DoCodeBlocks {
|
|
#
|
|
# Process Markdown `<pre><code>` blocks.
|
|
#
|
|
|
|
my $text = shift;
|
|
|
|
$text =~ s{
|
|
(?:\n\n|\A)
|
|
( # $1 = the code block -- one or more lines, starting with a space/tab
|
|
(?:
|
|
(?:[ ]{$g_tab_width} | \t) # Lines must start with a tab or a tab-width of spaces
|
|
.*\n+
|
|
)+
|
|
)
|
|
((?=^[ ]{0,$g_tab_width}\S)|\Z) # Lookahead for non-space at line-start, or end of doc
|
|
}{
|
|
my $codeblock = $1;
|
|
my $result; # return value
|
|
|
|
$codeblock = _EncodeCode(_Outdent($codeblock));
|
|
$codeblock = _Detab($codeblock);
|
|
$codeblock =~ s/\A\n+//; # trim leading newlines
|
|
$codeblock =~ s/\s+\z//; # trim trailing whitespace
|
|
|
|
$result = "\n\n<pre><code>" . $codeblock . "\n</code></pre>\n\n";
|
|
|
|
$result;
|
|
}egmx;
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
sub _DoCodeSpans {
|
|
#
|
|
# * 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> ...
|
|
#
|
|
|
|
my $text = shift;
|
|
|
|
$text =~ s@
|
|
(`+) # $1 = Opening run of `
|
|
(.+?) # $2 = The code block
|
|
(?<!`)
|
|
\1 # Matching closer
|
|
(?!`)
|
|
@
|
|
my $c = "$2";
|
|
$c =~ s/^[ \t]*//g; # leading whitespace
|
|
$c =~ s/[ \t]*$//g; # trailing whitespace
|
|
$c = _EncodeCode($c);
|
|
"<code>$c</code>";
|
|
@egsx;
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
sub _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.
|
|
#
|
|
local $_ = shift;
|
|
|
|
# Encode all ampersands; HTML entities are not
|
|
# entities within a Markdown code span.
|
|
s/&/&/g;
|
|
|
|
# Encode $'s, but only if we're running under Blosxom.
|
|
# (Blosxom interpolates Perl variables in article bodies.)
|
|
{
|
|
no warnings 'once';
|
|
if (defined($blosxom::version)) {
|
|
s/\$/$/g;
|
|
}
|
|
}
|
|
|
|
|
|
# Do the angle bracket song and dance:
|
|
s! < !<!gx;
|
|
s! > !>!gx;
|
|
|
|
# Now, escape characters that are magic in Markdown:
|
|
s! \* !$g_escape_table{'*'}!gx;
|
|
s! _ !$g_escape_table{'_'}!gx;
|
|
s! { !$g_escape_table{'{'}!gx;
|
|
s! } !$g_escape_table{'}'}!gx;
|
|
s! \[ !$g_escape_table{'['}!gx;
|
|
s! \] !$g_escape_table{']'}!gx;
|
|
s! \\ !$g_escape_table{'\\'}!gx;
|
|
|
|
return $_;
|
|
}
|
|
|
|
|
|
sub _DoItalicsAndBold {
|
|
my $text = shift;
|
|
|
|
# <strong> must go first:
|
|
$text =~ s{ (\*\*|__) (?=\S) (.+?[*_]*) (?<=\S) \1 }
|
|
{<strong>$2</strong>}gsx;
|
|
|
|
$text =~ s{ (\*|_) (?=\S) (.+?) (?<=\S) \1 }
|
|
{<em>$2</em>}gsx;
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
sub _DoBlockQuotes {
|
|
my $text = shift;
|
|
|
|
$text =~ s{
|
|
( # 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
|
|
)+
|
|
)
|
|
}{
|
|
my $bq = $1;
|
|
$bq =~ s/^[ \t]*>[ \t]?//gm; # trim one level of quoting
|
|
$bq =~ s/^[ \t]+$//mg; # trim whitespace-only lines
|
|
$bq = _RunBlockGamut($bq); # recurse
|
|
|
|
$bq =~ s/^/ /g;
|
|
# These leading spaces screw with <pre> content, so we need to fix that:
|
|
$bq =~ s{
|
|
(\s*<pre>.+?</pre>)
|
|
}{
|
|
my $pre = $1;
|
|
$pre =~ s/^ //mg;
|
|
$pre;
|
|
}egsx;
|
|
|
|
"<blockquote>\n$bq\n</blockquote>\n\n";
|
|
}egmx;
|
|
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
sub _FormParagraphs {
|
|
#
|
|
# Params:
|
|
# $text - string to process with html <p> tags
|
|
#
|
|
my $text = shift;
|
|
|
|
# Strip leading and trailing lines:
|
|
$text =~ s/\A\n+//;
|
|
$text =~ s/\n+\z//;
|
|
|
|
my @grafs = split(/\n{2,}/, $text);
|
|
|
|
#
|
|
# Wrap <p> tags.
|
|
#
|
|
foreach (@grafs) {
|
|
unless (defined( $g_html_blocks{$_} )) {
|
|
$_ = _RunSpanGamut($_);
|
|
s/^([ \t]*)/<p>/;
|
|
$_ .= "</p>";
|
|
}
|
|
}
|
|
|
|
#
|
|
# Unhashify HTML blocks
|
|
#
|
|
foreach (@grafs) {
|
|
if (defined( $g_html_blocks{$_} )) {
|
|
$_ = $g_html_blocks{$_};
|
|
}
|
|
}
|
|
|
|
return join "\n\n", @grafs;
|
|
}
|
|
|
|
|
|
sub _EncodeAmpsAndAngles {
|
|
# Smart processing for ampersands and angle brackets that need to be encoded.
|
|
|
|
my $text = shift;
|
|
|
|
# Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
|
|
# http://bumppo.net/projects/amputator/
|
|
$text =~ s/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/&/g;
|
|
|
|
# Encode naked <'s
|
|
$text =~ s{<(?![a-z/?\$!])}{<}gi;
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
sub _EncodeBackslashEscapes {
|
|
#
|
|
# Parameter: String.
|
|
# Returns: The string, with after processing the following backslash
|
|
# escape sequences.
|
|
#
|
|
local $_ = shift;
|
|
|
|
s! \\\\ !$g_escape_table{'\\'}!gx; # Must process escaped backslashes first.
|
|
s! \\` !$g_escape_table{'`'}!gx;
|
|
s! \\\* !$g_escape_table{'*'}!gx;
|
|
s! \\_ !$g_escape_table{'_'}!gx;
|
|
s! \\\{ !$g_escape_table{'{'}!gx;
|
|
s! \\\} !$g_escape_table{'}'}!gx;
|
|
s! \\\[ !$g_escape_table{'['}!gx;
|
|
s! \\\] !$g_escape_table{']'}!gx;
|
|
s! \\\( !$g_escape_table{'('}!gx;
|
|
s! \\\) !$g_escape_table{')'}!gx;
|
|
s! \\> !$g_escape_table{'>'}!gx;
|
|
s! \\\# !$g_escape_table{'#'}!gx;
|
|
s! \\\+ !$g_escape_table{'+'}!gx;
|
|
s! \\\- !$g_escape_table{'-'}!gx;
|
|
s! \\\. !$g_escape_table{'.'}!gx;
|
|
s{ \\! }{$g_escape_table{'!'}}gx;
|
|
|
|
return $_;
|
|
}
|
|
|
|
|
|
sub _DoAutoLinks {
|
|
my $text = shift;
|
|
|
|
$text =~ s{<((https?|ftp):[^'">\s]+)>}{<a href="$1">$1</a>}gi;
|
|
|
|
# Email addresses: <address@domain.foo>
|
|
$text =~ s{
|
|
<
|
|
(?:mailto:)?
|
|
(
|
|
[-.\w]+
|
|
\@
|
|
[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
|
|
)
|
|
>
|
|
}{
|
|
_EncodeEmailAddress( _UnescapeSpecialChars($1) );
|
|
}egix;
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
sub _EncodeEmailAddress {
|
|
#
|
|
# 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 on a filter by Matthew Wickline, posted to the BBEdit-Talk
|
|
# mailing list: <http://tinyurl.com/yu7ue>
|
|
#
|
|
|
|
my $addr = shift;
|
|
|
|
srand;
|
|
my @encode = (
|
|
sub { '&#' . ord(shift) . ';' },
|
|
sub { '&#x' . sprintf( "%X", ord(shift) ) . ';' },
|
|
sub { shift },
|
|
);
|
|
|
|
$addr = "mailto:" . $addr;
|
|
|
|
$addr =~ s{(.)}{
|
|
my $char = $1;
|
|
if ( $char eq '@' ) {
|
|
# this *must* be encoded. I insist.
|
|
$char = $encode[int rand 1]->($char);
|
|
} elsif ( $char ne ':' ) {
|
|
# leave ':' alone (to spot mailto: later)
|
|
my $r = rand;
|
|
# roughly 10% raw, 45% hex, 45% dec
|
|
$char = (
|
|
$r > .9 ? $encode[2]->($char) :
|
|
$r < .45 ? $encode[1]->($char) :
|
|
$encode[0]->($char)
|
|
);
|
|
}
|
|
$char;
|
|
}gex;
|
|
|
|
$addr = qq{<a href="$addr">$addr</a>};
|
|
$addr =~ s{">.+?:}{">}; # strip the mailto: from the visible part
|
|
|
|
return $addr;
|
|
}
|
|
|
|
|
|
sub _UnescapeSpecialChars {
|
|
#
|
|
# Swap back in all the special characters we've hidden.
|
|
#
|
|
my $text = shift;
|
|
|
|
while( my($char, $hash) = each(%g_escape_table) ) {
|
|
$text =~ s/$hash/$char/g;
|
|
}
|
|
return $text;
|
|
}
|
|
|
|
|
|
sub _TokenizeHTML {
|
|
#
|
|
# Parameter: String containing HTML markup.
|
|
# Returns: Reference to an array of the tokens comprising the input
|
|
# string. Each token is either a tag (possibly with nested,
|
|
# tags contained therein, such as <a href="<MTFoo>">, or a
|
|
# run of text between tags. Each element of the array is a
|
|
# two-element array; the first is either 'tag' or 'text';
|
|
# the second is the actual value.
|
|
#
|
|
#
|
|
# Derived from the _tokenize() subroutine from Brad Choate's MTRegex plugin.
|
|
# <http://www.bradchoate.com/past/mtregex.php>
|
|
#
|
|
|
|
my $str = shift;
|
|
my $pos = 0;
|
|
my $len = length $str;
|
|
my @tokens;
|
|
|
|
my $depth = 6;
|
|
my $nested_tags = join('|', ('(?:<[a-z/!$](?:[^<>]') x $depth) . (')*>)' x $depth);
|
|
my $match = qr/(?s: <! ( -- .*? -- \s* )+ > ) | # comment
|
|
(?s: <\? .*? \?> ) | # processing instruction
|
|
$nested_tags/ix; # nested tags
|
|
|
|
while ($str =~ m/($match)/g) {
|
|
my $whole_tag = $1;
|
|
my $sec_start = pos $str;
|
|
my $tag_start = $sec_start - length $whole_tag;
|
|
if ($pos < $tag_start) {
|
|
push @tokens, ['text', substr($str, $pos, $tag_start - $pos)];
|
|
}
|
|
push @tokens, ['tag', $whole_tag];
|
|
$pos = pos $str;
|
|
}
|
|
push @tokens, ['text', substr($str, $pos, $len - $pos)] if $pos < $len;
|
|
\@tokens;
|
|
}
|
|
|
|
|
|
sub _Outdent {
|
|
#
|
|
# Remove one level of line-leading tabs or spaces
|
|
#
|
|
my $text = shift;
|
|
|
|
$text =~ s/^(\t|[ ]{1,$g_tab_width})//gm;
|
|
return $text;
|
|
}
|
|
|
|
|
|
sub _Detab {
|
|
#
|
|
# Cribbed from a post by Bart Lateur:
|
|
# <http://www.nntp.perl.org/group/perl.macperl.anyperl/154>
|
|
#
|
|
my $text = shift;
|
|
|
|
$text =~ s{(.*?)\t}{$1.(' ' x ($g_tab_width - length($1) % $g_tab_width))}ge;
|
|
return $text;
|
|
}
|
|
|
|
|
|
1;
|
|
|
|
__END__
|
|
|
|
|
|
=pod
|
|
|
|
=head1 NAME
|
|
|
|
B<Markdown>
|
|
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
B<Markdown.pl> [ B<--html4tags> ] [ B<--version> ] [ B<-shortversion> ]
|
|
[ I<file> ... ]
|
|
|
|
|
|
=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).
|
|
|
|
For more information about Markdown's syntax, see:
|
|
|
|
http://daringfireball.net/projects/markdown/
|
|
|
|
|
|
=head1 OPTIONS
|
|
|
|
Use "--" to end switch parsing. For example, to open a file named "-z", use:
|
|
|
|
Markdown.pl -- -z
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<--html4tags>
|
|
|
|
Use HTML 4 style for empty element tags, e.g.:
|
|
|
|
<br>
|
|
|
|
instead of Markdown's default XHTML style tags, e.g.:
|
|
|
|
<br />
|
|
|
|
|
|
=item B<-v>, B<--version>
|
|
|
|
Display Markdown's version number and copyright information.
|
|
|
|
|
|
=item B<-s>, B<--shortversion>
|
|
|
|
Display the short-form version number.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head1 BUGS
|
|
|
|
To file bug reports or feature requests (other than topics listed in the
|
|
Caveats section above) please send email to:
|
|
|
|
support@daringfireball.net
|
|
|
|
Please include with your report: (1) the example input; (2) the output
|
|
you expected; (3) the output Markdown actually produced.
|
|
|
|
|
|
=head1 VERSION HISTORY
|
|
|
|
See the readme file for detailed release notes for this version.
|
|
|
|
1.0.1 - 14 Dec 2004
|
|
|
|
1.0 - 28 Aug 2004
|
|
|
|
|
|
=head1 AUTHOR
|
|
|
|
John Gruber
|
|
http://daringfireball.net
|
|
|
|
PHP port and other contributions by Michel Fortin
|
|
http://michelf.com
|
|
|
|
|
|
=head1 COPYRIGHT AND LICENSE
|
|
|
|
Copyright (c) 2003-2004 John Gruber
|
|
<http://daringfireball.net/>
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
* Neither the name "Markdown" nor the names of its contributors may
|
|
be used to endorse or promote products derived from this software
|
|
without specific prior written permission.
|
|
|
|
This software is provided by the copyright holders and contributors "as
|
|
is" and any express or implied warranties, including, but not limited
|
|
to, the implied warranties of merchantability and fitness for a
|
|
particular purpose are disclaimed. In no event shall the copyright owner
|
|
or contributors be liable for any direct, indirect, incidental, special,
|
|
exemplary, or consequential damages (including, but not limited to,
|
|
procurement of substitute goods or services; loss of use, data, or
|
|
profits; or business interruption) however caused and on any theory of
|
|
liability, whether in contract, strict liability, or tort (including
|
|
negligence or otherwise) arising in any way out of the use of this
|
|
software, even if advised of the possibility of such damage.
|
|
|
|
=cut
|