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#!/usr/bin/env perl
#-*- perl -*-
#
# Copyright (C) 2001 Ken'ichi Fukamachi
# All rights reserved. This program is free software; you can
# redistribute it and/or modify it under the same terms as Perl itself.
#
# $FML: .track_relation.pl,v 1.4 2001/10/08 06:40:18 fukachan Exp $
#
use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK $AUTOLOAD);
use Carp;
my $debug = $ENV{'debug'} ? 1 : 0;
# %rfc rfc => rfc description
# %rfc_exists rfc in this directory
# %rfc_prev double link list
# %rfc_next double link list
my (%rfc_exists, %rfc, %rfc_prev, %rfc_next);
my ($result) = {};
check_rfc_here( \%rfc_exists );
read_rfc_index( "./rfc-index.txt", \%rfc );
analyze( $result );
show( $result );
sub check_rfc_here
{
my ($rfc_exists) = @_;
for (<rfc*txt>) {
if (/RFC(\d+)/i) {
my $x = sprintf("RFC%04d", $1);
$rfc_exists->{$x} = $x;
}
}
}
sub read_rfc_index
{
my ($f, $rfc) = @_;
use FileHandle;
my $fh = new FileHandle $f;
my $cur = undef;
if (defined $fh) {
while (<$fh>) {
if (/^(\d+)/) {
$cur = $1;
}
if (defined $cur) {
$rfc->{ "RFC$cur" } .= $_;
}
}
close($fh);
}
}
sub analyze
{
my ($rfc_link) = @_;
# check link list for specified $rfc.
# result: $rfc_prev{$rfc} <- $rfc -> $rfc_next{$rfc}
for my $rfc (sort {$a<=>$b} keys %rfc_exists) {
_analyze_links($rfc, $rfc{$rfc});
}
# combine link lists.
my $r = {};
_combine( $r );
# o.k. summalize information as a link to the last component.
#
# A -> B -> LAST
# C -> D -> LAST
# =>
# A -> B -> C -> D -> LAST
#
# This logic is incomplete, we chck all relation for all components.
#
my ($k, $v);
while (($k, $v) = each %$r) {
my $last = _last_rfc($v);
print "$k => @$v (last=$last)\n" if $debug;
# add myself to appear in the index.html
# even if I am in the last node;
$rfc_link->{ $k } = $k;
$rfc_link->{ $last } .= " ".join(" ", @$v );
}
}
sub _last_rfc
{
my ($ra) = @_;
my (@rev) = reverse @$ra;
return $rev[0];
}
sub _combine
{
my ($result_link) = @_;
for my $rfc (sort {$a<=>$b} keys %rfc_exists) {
my (@linklist);
my (@buf) = split(/\s+/, join(" ",
$rfc_prev{ $rfc },
$rfc,
$rfc_next{ $rfc }));
for my $rfc (@buf) {
if (defined $rfc_prev{$rfc}) {
push(@linklist, split(/\s+/, $rfc_prev{$rfc}));
}
push(@linklist, $rfc);
}
my $x = _remove_dup( \@linklist );
$result_link->{ $rfc } = _remove_dup( \@linklist );
}
}
sub _sort_links
{
my ($ra, $rb) = ($a, $b);
$ra =~ s/RFC//i;
$rb =~ s/RFC//i;
$rb <=> $ra;
}
sub _remove_dup
{
my ($ra) = @_;
my (%uniq);
my (@rbuf);
for (@$ra) {
next if $uniq{$_};
$uniq{$_} = 1;
push(@rbuf, $_);
}
return \@rbuf;
}
sub _analyze_links
{
my ($rfc, $s) = @_;
$s =~ s/\n/ /g; # one line
# Title of RFC. Author 1, Author 2, Author 3. Issue date.
# (Format: ASCII) (Obsoletes xxx) (Obsoleted by xxx) (Updates xxx)
# (Updated by xxx) (Also FYI ####) (Status: ssssss)
if ($s =~ /(Obsoletes)([\s\w\d,]+)/i) {
$rfc_prev{ $rfc } .= _clean_up($2);
_check_exists($rfc_prev{ $rfc } );
}
if ($s =~ /(Updates)([\s\w\d,]+)/i) {
$rfc_prev{ $rfc } .= _clean_up($2);
_check_exists($rfc_prev{ $rfc } );
}
if ($s =~ /(Updated\s+by)([\s\w\d,]+)/i) {
$rfc_next{ $rfc } .= _clean_up($2);
_check_exists($rfc_next{ $rfc } );
}
if ($s =~ /(Obsoleted\s+by)([\s\w\d,]+)/i) {
$rfc_next{ $rfc } .= _clean_up($2);
_check_exists($rfc_next{ $rfc } );
}
}
sub _rfc2filename
{
my ($fn) = @_;
$fn =~ s/RFC/rfc/;
$fn =~ s/0(\d{3})/$1/;
$fn .= ".txt";
return $fn;
}
sub _check_exists
{
my ($buf) = @_;
for (split(/\s+/, $buf)) {
if (/rfc\d+/i) {
my $fn = _rfc2filename($_);
unless (-f $fn) {
print STDERR "no $fn, wget ... \n";
system "wget http://www.ietf.org/rfc/$fn";
}
}
}
}
sub _clean_up
{
my ($s) = @_;
$s =~ s/\n/ /g;
$s =~ s/,/ /g;
$s =~ s/^\s+//g;
return " $s ";
}
=head2 C<show( $result_hash )>
show rfc relation from the given $result_hash.
$result_hash contains the following hash pair.
RFC-LAST => RFC-A RFC-B RFC-C ... RFC-LAST
=cut
sub show
{
my ($r) = @_;
print "<UL>\n";
for my $last_rfc (sort _sort_links keys %$r) {
my $v = $r-> { $last_rfc };
my @r = sort _sort_links split(/\s+/, $v);
my $links = _remove_dup( \@r );
print "<LI>\n";
print _href( $last_rfc ), "\n";
print _who_i_am( $last_rfc );
my $buf;
for my $link (@$links) {
next if $link eq $last_rfc;
if ($link =~ /rfc\d+/i) {
$buf .= "<A HREF=\"#$link\">$link</A>\n";
}
}
print "<BR> Updates:\n";
print $buf ? $buf : "none";
print "<BR>\n";
}
print "</UL>\n";
}
sub _href
{
my ($rfc) = @_;
my $fn = _rfc2filename($rfc);
return "<A NAME=\"$rfc\" HREF=\"$fn\">$rfc</A>";
}
sub _who_i_am
{
my ($rfc) = @_;
my $buf = $rfc{ $rfc };
$buf =~ s/^\d+\s//g;
$buf =~ s/\n/ /g;
$buf =~ s/\s+/ /g;
if ($buf =~ /^(.*?)\.\s+/) {
return "\"$1\"\n";
}
}
1;
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