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10 years ago
package Subtitle::SRT;
use strict;
use warnings;
use utf8;
use Subtitle::Utils qw(:string :timing);
use base 'Subtitle::BASE';
10 years ago
sub new {
my ($class, %args) = @_;
my $self = {
debug => 0,
eol => "\n",
%args,
events => [],
log => [],
timing_fmt => "%02d:%02d:%02d,%03d",
};
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return bless($self, $class);
}
sub new_event { return +{ id => undef, timing => undef, text => undef }; }
sub parse {
my ($self, $lines) = @_;
my $linenum = 0;
my $event;
foreach my $line (@{ $lines }) {
$linenum++;
chomp_all($line);
# expected: event id
if ($line and not $event) {
$event = $self->new_event;
trim($line);
$event->{id} = $line;
$self->log(debug => "New event with id: $event->{id}");
next;
}
# expected: timing
if ($line and $event and not $event->{timing}) {
$self->log(debug => "Expecting timing line at $linenum");
my $timing = [];
my ($start, $end, $rest) = ($line =~ m/(\S+)\s*-->\s*(\S+)(.*)/o);
unless ($start and $end) {
$self->log(warn => "Expected timing but found `$line` at $linenum, skipped");
next;
}
$timing->[0] = parse_timing($start);
unless ($timing->[0] >= 0) {
$self->log(warn => "Can't parse timing at line $linenum: $start");
next;
}
$timing->[1] = parse_timing($end);
unless ($timing->[1] >= 0) {
$self->log(warn => "Can't parse timing at line $linenum: $end");
next;
}
$event->{timing} = $timing;
trim($rest);
next unless $rest;
# extension: timing
# example: X1:050 X2:669 Y1:234 Y2:436
if ($rest =~ m/([XY][12]:(\d+))/io) {
foreach my $token (split(/\s+/, $rest)) {
$event->{coords} //= {};
if ($token =~ m/([XY][12]):(\d+)/io) {
$event->{coords}->{lc($1)} = $2;
next;
}
$self->log(warn => "Garbage detected instead event coord: $token");
}
unless (scalar keys %{ $event->{coords} } == 4) {
delete $event->{coords};
$self->log(warn => "Incomplete coord set for event at line $linenum");
}
next;
}
# extension: ssa-like style
# example: SSA: Dialogue, Layer: 0, Style: Reply, Name: NTP, MarginL: 0300, MarginR: 0000, MarginV: 0300, Effect: !Effect
if ($rest =~ m/SSA:\s*\S+,\s*(.+)/o) {
$rest = $1;
foreach my $token (split(/\s*,\s*/, $rest)) {
next unless $token =~ m/^(\S+):\s*(.+)/o;
trim($2);
$event->{style} //= {};
$event->{style}->{lc($1)} = $2;
}
next;
}
$self->log(warn => "garbage after timing at line $linenum: $rest");
next;
}
# expected: empty line
if ($event and not $line) {
$self->log(debug => "Empty line at line $linenum -> finalize");
push @{ $self->{events} }, $event;
undef $event;
next;
}
# expected: event text
if ($line and $event and $event->{timing}) {
trim($line);
$self->log(debug => "Text line at $linenum -> append");
$event->{text} //= '';
$event->{text} .= $self->{eol} if $event->{text};
$event->{text} .= $line;
next;
}
} # foreach @lines
# finalize last event
if ($event and $event->{timing} and $event->{text}) {
push @{ $self->{events} }, $event;
}
return scalar @{ $self->{events} };
}
sub build {
my ($self) = @_;
my ($hrs, $min, $sec, $msec, $out);
$out = '';
foreach my $e (@{ $self->{events} }) {
$out .= $e->{id} . "\n";
my $start = sprintf $self->{timing_fmt},
make_timing($e->{timing}->[0]);
my $end = sprintf $self->{timing_fmt},
make_timing($e->{timing}->[1]);
$out .= sprintf "%s --> %s\n", $start, $end;
$out .= "$e->{text}\n";
$out .= "\n";
}
return $out;
}
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1;