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#!/usr/bin/env perl
use strict;
use warnings;
use 5.020;
use utf8;
use File::Slurp qw(read_file);
use JSON;
use List::Util qw(uniq);
sub show_usage {
my ($exit_code) = @_;
say STDERR
"Usage: umlauf-to-dot <wagenreihung.json> [line number] [limit] | dot -Tpng > umlauf.png";
exit $exit_code;
}
sub contained_in {
my ( $value, @list ) = @_;
for my $elem (@list) {
if ( $elem eq $value ) {
return 1;
}
}
return;
}
sub format_train {
my ( $train_no, $train ) = @_;
return sprintf( '"%s %d\n%s\n%s"',
$train->{type} // $train->{raw} // 'Zug',
$train_no,
$train->{route}{start} // $train->{route}{preStart} // '?',
$train->{route}{end} // $train->{route}{postEnd} // '?' );
}
binmode( STDOUT, ':encoding(utf-8)' );
if ( @ARGV < 1 ) {
show_usage(1);
}
my ( $file, $line, $limit ) = @ARGV;
my $file_content = read_file($file);
my $json = JSON->new->utf8->decode($file_content);
my $map = $json->{train};
sub build_cycle {
my ( $line, $cycle_id ) = @_;
my @queue = ( [ $line, 0 ] );
my @train_numbers;
while (@queue) {
my ( $train_number, $distance ) = @{ pop @queue };
push( @train_numbers, $train_number );
if ( $limit and $distance > $limit ) {
next;
}
my @candidates;
my $train = $map->{$train_number};
if ( my $c = $train->{cycle}{$cycle_id} ) {
push( @candidates, @{ $c->{from} // [] } );
push( @candidates, @{ $c->{to} // [] } );
}
@candidates = uniq @candidates;
@candidates
= grep { not contained_in( $_, @train_numbers, @queue ) } @candidates;
if (@candidates) {
printf( "# handle %s -> push %s\n",
$train_number, join( " ", @candidates ) );
}
push( @queue, map { [ $_, $distance + 1 ] } @candidates );
}
my @output;
for my $train_number (@train_numbers) {
my $train = $map->{$train_number};
if ( my $c = $train->{cycle}{$cycle_id} ) {
for my $from ( @{ $c->{from} // [] } ) {
push(
@output,
sprintf( "%s -> %s;",
format_train( $from, $map->{$from} ),
format_train( $train_number, $map->{$train_number} ) )
);
}
for my $to ( @{ $c->{to} // [] } ) {
push(
@output,
sprintf( "%s -> %s;",
format_train( $train_number, $map->{$train_number} ),
format_train( $to, $map->{$to} ) )
);
}
}
if ( $train_number != $line ) {
push(
@output,
sprintf(
"%s [shape=box,href=\"https://lib.finalrewind.org/dbdb/db_umlauf/%s.svg\"];",
format_train( $train_number, $map->{$train_number} ),
$train_number
)
);
}
}
return @output;
}
my @cycle_ids;
push( @cycle_ids, keys %{ $map->{$line}{cycle} // {} } );
say "digraph Umlauf {";
my @all_lines;
for my $cycle_id (@cycle_ids) {
push( @all_lines, build_cycle( $line, $cycle_id ) );
}
say join( "\n", uniq @all_lines );
printf( "%s [style=bold];\n", format_train( $line, $map->{$line} ) );
say "}"
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