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Markdown.pl: minor speed optimizations 

There's not a lot to work with in the way of speeding
things up.  However, after timing a few different changes
there were some minor speed ups to be had.

In particular, md5_hex is no longer used in favor
of a global hash table instead.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
master
Kyle J. McKay 7 years ago
parent
189e87ac75
commit
8f8f102d1b
1 changed files with 52 additions and 64 deletions
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  1. 116
      Markdown.pl

116
Markdown.pl
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@ -29,8 +29,9 @@ All rights reserved.
close(DATA) if fileno(DATA);
require Exporter;
use Digest::MD5 qw(md5 md5_hex);
use Digest::MD5 qw(md5);
use File::Basename qw(basename);
use Scalar::Util qw(refaddr);
use Pod::Usage;
@ISA = qw(Exporter);
@EXPORT_OK = qw(Markdown);
@ -41,6 +42,7 @@ $INC{__PACKAGE__.'.pm'} = $INC{basename(__FILE__)} unless exists $INC{__PACKAGE_
# use utf8;
# binmode( STDOUT, ":utf8" ); # c.f.: http://acis.openlib.org/dev/perl-unicode-struggle.html
sub block_id;
#
# Global default settings:
@ -70,13 +72,16 @@ $g_nested_brackets = qr{
# Table of hash values for escaped characters:
my %g_escape_table;
foreach my $char (split //, "\\\`*_~{}[]()>#+-.!") {
$g_escape_table{$char} = md5_hex($char);
$g_escape_table{$char} = block_id($char,1);
}
# Permanent block id table
my %g_perm_block_ids;
# Global hashes, used by various utility routines
my %g_urls;
my %g_titles;
my %g_block_ids;
my %g_html_blocks;
my %opt;
@ -262,6 +267,20 @@ elsif (!caller) {
}
# Return a "block id" to use to identify the block that does not contain
# any characters that could be misinterpreted by the rest of the code
# Originally this used md5_hex but that's unnecessarily slow
# Instead just use the refaddr of the scalar ref of the entry for that
# key in either the global or, if the optional second argument is true,
# permanent table. To avoid the result being confused with anything
# else, it's prefixed with a control character and suffixed with another
# both of which are not allowed by the XML standard or Unicode.
sub block_id {
$_[1] ?
"\2".refaddr(\$g_perm_block_ids{$_[0]})."\3" :
"\5".refaddr(\$g_block_ids{$_[0]})."\6";
}
sub Markdown {
#
@ -298,6 +317,7 @@ sub Markdown {
# articles):
%g_urls = ();
%g_titles = ();
%g_block_ids = ();
%g_html_blocks = ();
$g_list_level = 0;
@ -359,7 +379,7 @@ sub _HashBTCodeBlocks {
$codeblock = _EncodeCode($codeblock); # or run highlighter here
$codeblock = "<pre><code>" . $codeblock . "\n</code></pre>";
my $key = md5_hex($codeblock);
my $key = block_id($codeblock);
$g_html_blocks{$key} = $codeblock;
"\n\n" . $key . "\n\n";
}egmx;
@ -442,7 +462,7 @@ sub _HashHTMLBlocks {
(?=\n+|\Z) # followed by a newline or end of document
)
}{
my $key = md5_hex($1);
my $key = block_id($1);
$g_html_blocks{$key} = $1;
"\n\n" . $key . "\n\n";
}egmx;
@ -462,7 +482,7 @@ sub _HashHTMLBlocks {
(?=\n+|\Z) # followed by a newline or end of document
)
}{
my $key = md5_hex($1);
my $key = block_id($1);
$g_html_blocks{$key} = $1;
"\n\n" . $key . "\n\n";
}egmx;
@ -484,7 +504,7 @@ sub _HashHTMLBlocks {
(?=\n{2,}|\Z) # followed by a blank line or end of document
)
}{
my $key = md5_hex($1);
my $key = block_id($1);
$g_html_blocks{$key} = $1;
"\n\n" . $key . "\n\n";
}egx;
@ -507,7 +527,7 @@ sub _HashHTMLBlocks {
(?=\n{2,}|\Z) # followed by a blank line or end of document
)
}{
my $key = md5_hex($1);
my $key = block_id($1);
$g_html_blocks{$key} = $1;
"\n\n" . $key . "\n\n";
}egx;
@ -527,9 +547,9 @@ sub _RunBlockGamut {
$text = _DoHeaders($text);
# Do Horizontal Rules:
$text =~ s{^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$}{\n<hr$opt{empty_element_suffix}\n}gmx;
$text =~ s{^[ ]{0,2}([ ]? -[ ]?){3,}[ \t]*$}{\n<hr$opt{empty_element_suffix}\n}gmx;
$text =~ s{^[ ]{0,2}([ ]? _[ ]?){3,}[ \t]*$}{\n<hr$opt{empty_element_suffix}\n}gmx;
$text =~ s{^ {0,3}\*(?: {0,2}\*){2,}[ \t]*$}{\n<hr$opt{empty_element_suffix}\n}gm;
$text =~ s{^ {0,3}\_(?: {0,2}\_){2,}[ \t]*$}{\n<hr$opt{empty_element_suffix}\n}gm;
$text =~ s{^ {0,3}\-(?: {0,2}\-){2,}[ \t]*$}{\n<hr$opt{empty_element_suffix}\n}gm;
$text = _DoLists($text);
@ -594,12 +614,10 @@ sub _EscapeSpecialChars {
# 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
# corresponding block id value; this is likely
# overkill, but it should prevent us from colliding
# with the escape values by accident.
$cur_token->[1] =~ s! \* !$g_escape_table{'*'}!gx;
$cur_token->[1] =~ s! _ !$g_escape_table{'_'}!gx;
$cur_token->[1] =~ s! ~ !$g_escape_table{'~'}!gx;
$cur_token->[1] =~ s!([*_~])!$g_escape_table{$1}!g;
$text .= $cur_token->[1];
} else {
my $t = $cur_token->[1];
@ -645,15 +663,13 @@ sub _DoAnchors {
if (defined $g_urls{$link_id}) {
my $url = _PrefixURL($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
$url =~ s! ~ !$g_escape_table{'~'}!gx; # and strike through.
# We've got to encode these to avoid conflicting
# with italics, bold and strike through.
$url =~ s!([*_~])!$g_escape_table{$1}!g;
$result = "<a href=\"$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;
$title =~ s! ~ !$g_escape_table{'~'}!gx;
$title =~ s!([*_~])!$g_escape_table{$1}!g;
$result .= " title=\"$title\"";
}
$result .= ">$link_text</a>";
@ -691,16 +707,14 @@ sub _DoAnchors {
my $title = $6;
$url = _PrefixURL($url);
$url =~ s! \* !$g_escape_table{'*'}!gx; # We've got to encode these to avoid
$url =~ s! _ !$g_escape_table{'_'}!gx; # conflicting with italics, bold
$url =~ s! ~ !$g_escape_table{'~'}!gx; # and strike through.
# We've got to encode these to avoid conflicting
# with italics, bold and strike through.
$url =~ s!([*_~])!$g_escape_table{$1}!g;
$result = "<a href=\"$url\"";
if (defined $title) {
$title =~ s/\042/&quot;/g;
$title =~ s! \* !$g_escape_table{'*'}!gx;
$title =~ s! _ !$g_escape_table{'_'}!gx;
$title =~ s! ~ !$g_escape_table{'~'}!gx;
$title =~ s!([*_~])!$g_escape_table{$1}!g;
$result .= " title=\"$title\"";
}
@ -749,15 +763,13 @@ sub _DoImages {
$alt_text =~ s/"/&quot;/g;
if (defined $g_urls{$link_id}) {
my $url = _PrefixURL($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
$url =~ s! ~ !$g_escape_table{'~'}!gx; # and strike through.
# We've got to encode these to avoid conflicting
# with italics, bold and strike through.
$url =~ s!([*_~])!$g_escape_table{$1}!g;
$result = "<img src=\"$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;
$title =~ s! ~ !$g_escape_table{'~'}!gx;
$title =~ s!([*_~])!$g_escape_table{$1}!g;
$result .= " title=\"$title\"";
}
$result .= $opt{empty_element_suffix};
@ -804,14 +816,12 @@ sub _DoImages {
$url = _PrefixURL($url);
$alt_text =~ s/"/&quot;/g;
$title =~ s/"/&quot;/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
$url =~ s! ~ !$g_escape_table{'~'}!gx; # and strike through.
# We've got to encode these to avoid conflicting
# with italics, bold and strike through.
$url =~ s!([*_~])!$g_escape_table{$1}!g;
$result = "<img src=\"$url\" alt=\"$alt_text\"";
if (defined $title) {
$title =~ s! \* !$g_escape_table{'*'}!gx;
$title =~ s! _ !$g_escape_table{'_'}!gx;
$title =~ s! ~ !$g_escape_table{'~'}!gx;
$title =~ s!([*_~])!$g_escape_table{$1}!g;
$result .= " title=\"$title\"";
}
$result .= $opt{empty_element_suffix};
@ -1135,14 +1145,7 @@ sub _EncodeCode {
s! > !&gt;!gx;
# Now, escape characters that are magic in Markdown:
s! \* !$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! \[ !$g_escape_table{'['}!gx;
s! \] !$g_escape_table{']'}!gx;
s! \\ !$g_escape_table{'\\'}!gx;
s!([*_~{}\[\]\\])!$g_escape_table{$1}!g;
return $_;
}
@ -1265,23 +1268,8 @@ sub _EncodeBackslashEscapes {
#
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;
s{ \\! }{$g_escape_table{'!'}}gx;
s!\\\\!$g_escape_table{'\\'}!go; # Must process escaped backslashes first.
s{\\([`*_~{}\[\]()>#+\-.!`])}{$g_escape_table{$1}}g;
return $_;
}
@ -1458,7 +1446,7 @@ sub _PrefixURL {
return $url if $url =~ m,^//, || $url =~ /^[A-Za-z][A-Za-z0-9+.-]*:/;
my $ans = $opt{url_prefix};
$ans = $opt{img_prefix}
if $opt{img_prefix} ne '' && $url =~ /\.(?:png|gif|jpe?g|svg?z)$/i;
if $opt{img_prefix} ne '' && $url =~ /\.(?:png|gif|jpe?g|svg?z)$/i;
return $url unless $ans ne '';
$ans .= '/' if substr($ans, -1, 1) ne '/';
$ans .= substr($url, 0, 1) eq '/' ? substr($url, 1) : $url;

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