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#!/usr/bin/env perl
# Copyright (C) 2020 Daniel Friesel
#
# SPDX-License-Identifier: BSD-2-Clause
use strict;
use warnings;
use 5.020;
use File::Slurp qw(write_file);
use IPC::Run3;
use JSON;
sub show_usage {
my ($exit_code) = @_;
say STDERR "Usage: db-wagenreihung-to-json <wagenreihung.pdf>\n";
say STDERR
"You can obtain the latest PDF from <https://data.deutschebahn.com/dataset/zugbildungsplanzugbildungsplan-zpar>";
exit $exit_code;
}
if ( @ARGV == 0 ) {
show_usage(1);
}
run3( [ "which", "pdftotext" ], \undef, \undef, \undef );
if ($?) {
say STDERR
"Error: db-wagenreihung-to-json depends on the pdftotext utility, but could not find it on this system.\n";
say STDERR
"On Debian and derivatives, it should be available in the 'poppler-utils' package.";
exit 2;
}
my $wr_pdf = $ARGV[0];
my $wr_txt;
my $command = [ "pdftotext", "-layout", "-nopgbrk", $wr_pdf, "/dev/stdout" ];
# stdin: /dev/null
# stdout: $wr_txt
# stderr: forwarded to terminal
run3( $command, \undef, \$wr_txt, undef,
{ binmode_stdout => ':encoding(utf-8)' } );
if ($?) {
my $exit_status = $? >> 8;
say STDERR
"\nError: 'pdftotext $wr_pdf' failed (exit status: $exit_status)";
exit 2;
}
my @lines = split( qr{\n}, $wr_txt );
my ( $type, $number );
my %map;
my %wagon_map;
my $state = "";
for my $line (@lines) {
if ( $line
=~ m{ ^ (?<type> [EINR][CJN][ A-Z-]{6}) (?<number> [ 0-9]{2,12}) }x )
{
$type = $+{type};
$type =~ tr{ }{}d;
$number = $+{number};
$number =~ tr{ }{}d;
if ( $number !~ m{ ^ \d+ $ }x ) {
next;
}
$state = "train_no";
#say "$type $number";
$map{$number} = {
raw => $type,
};
if ( $type eq 'ICE-A' ) {
$map{$number}{type} = 'ICE 1/2/4';
}
elsif ( $type eq 'ICE-W' ) {
$map{$number}{type} = 'ICE 3';
$map{$number}{short} = '3';
}
elsif ( $type eq 'ICE' ) {
$map{$number}{type} = 'ICE 1/2/4';
}
elsif ( $type eq 'ICE-T' ) {
$map{$number}{type} = 'ICE T';
$map{$number}{short} = 'T';
}
elsif ( $type eq 'IC-A' ) {
$map{$number}{type} = 'Metropolitan';
$map{$number}{short} = 'M';
}
elsif ( $type eq 'IC-D' ) {
$map{$number}{type} = 'IC2';
$map{$number}{short} = '2';
}
elsif ( $type eq 'IC-E' ) {
$map{$number}{type} = 'IC2 KISS';
$map{$number}{short} = '2';
}
else {
$map{$number}{type} = $type;
}
}
elsif ( $line =~ m{^LPF} ) {
# Not in passenger service ("Leehrfahrt"). Ignore it for now.
# FWIW, LPF(T) can be further distinguished:
# LPFT-A: ICE BR 401/402
# LPFT-B: ICE BR 412
# LPFT-T: ICE BR 411 / 415 / 605
# LPFT-W: ICE BR 403 / 406
$number = undef;
$state = "";
}
elsif ( $state eq "train_no" and $line =~ m{ ^ \s{5} \S }x ) {
$state = "route";
$map{$number}{route} = "";
}
# ICE types can be further distinguished by rolling stock. For instance,
# ICE 4 is the only ICE-A variant with restaurant and first-class seats
# in the same wagon ("ARmz").
elsif ( $number and $line =~ m{^\d*\s+ARmz} ) {
if ( $map{$number}{type} eq 'ICE 1/2/4' ) {
$map{$number}{type} = 'ICE 4';
$map{$number}{short} = '4';
}
}
elsif ( $number and $line =~ m{^\d*\s+WRmz} ) {
#say "ICE 1 / ICE 3 Redesign (WRmz)";
if ( $map{$number}{type} eq 'ICE 1/2/4' ) {
$map{$number}{type} = 'ICE 1';
$map{$number}{short} = '1';
}
elsif ( $map{$number}{type} eq 'ICE 3' ) {
$map{$number}{type} = 'ICE 3 Redesign';
$map{$number}{short} = '3R';
}
}
elsif ( $number and $line =~ m{^\d*\s+WRmbsz} ) {
#say "ICE 2 (WRmbsz)";
if ( $map{$number}{type} eq 'ICE 1/2/4' ) {
$map{$number}{type} = 'ICE 2';
$map{$number}{short} = '2';
}
}
elsif ( $number and $line =~ m{^\d*\s+Bpmbsz} ) {
#say "ICE 3 Velaro";
if ( $map{$number}{type} eq 'ICE 3' ) {
$map{$number}{type} = 'ICE 3 Velaro';
$map{$number}{short} = '3V';
}
}
if ( $state eq "route" and $line =~ m{ ^ \s{5} (?<route> .* ) $ }x ) {
if ( length( $map{$number}{route} ) ) {
$map{$number}{route} .= ' ';
}
$map{$number}{route} .= $+{route};
}
elsif ( $state eq "route" and $line eq "" ) {
$state = "conditions";
}
elsif ( $state eq "conditions" and $line =~ m{ Hg | Tfz | BrH }x ) {
$state = "details";
}
if ( $number
and $line
=~ m{ ^ \d* \s{1,10} (?<type> D? (WL)? (A|AB|B|W) R? D? [aceimpvw] \S* ) \s* (?<number> \d+ )? (?: $ | \s{6} ) }x
)
{
$state = "wagonorder";
push( @{ $wagon_map{$number} }, [ $+{type}, $+{number} ] );
#$map{$number}{has_wagon}{$1} = \1;
$map{$number}{wagons}{$1} = \1;
}
if ( $state eq "conditions" and length($line) and $line =~ m{ \S }x ) {
push( @{ $map{$number}{conditions} }, $line );
}
if ( $state eq "details"
and length($line)
and $line =~ m{ Hg | Tfz | BrH }x )
{
push( @{ $map{$number}{details} }, $line );
}
}
for my $train_number ( keys %map ) {
my $wagon_numbers_ok = 1;
my $wagon_types_ok = 1;
my %bincount;
my %type_by_wagon_number;
for my $wagon ( @{ $wagon_map{$train_number} // [] } ) {
my ( $wagon_type, $wagon_number ) = @{$wagon};
if ( not $wagon_number ) {
$wagon_numbers_ok = 0;
}
else {
$bincount{$wagon_number}++;
push( @{ $type_by_wagon_number{$wagon_number} }, $wagon_type );
}
}
if ($wagon_numbers_ok) {
for my $wagon ( @{ $wagon_map{$train_number} // [] } ) {
my ( $wagon_type, $wagon_number ) = @{$wagon};
$map{$train_number}{wagon}{ $wagon->[1] } = $wagon_type;
if ( $bincount{$wagon_number} > 1 ) {
if ( $type_by_wagon_number{$wagon_number}[0] ne
$type_by_wagon_number{$wagon_number}[1] )
{
$wagon_types_ok = 0;
}
}
}
}
if ( not $wagon_types_ok ) {
# train type may differ depending on date of week or similar. We don't
# parse/handle that yet.
delete $map{$train_number}{type};
delete $map{$train_number}{short};
delete $map{$train_number}{wagon};
delete $map{$train_number}{has_wagon};
}
}
# use canonical output (i.e., sort hash keys) to allow for easy diffing.
say JSON->new->utf8->canonical->encode( {%map} );
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