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package Subtitle::SRT;
use strict;
use warnings;
use feature qw(switch);
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use utf8;
use base 'Subtitle::BASE';
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sub new {
my ($class, %args) = @_;
my $self = {
debug => 0,
eol => "\n",
%args,
events => [],
log => [],
};
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return bless($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++;
$line = $self->chomp($line);
# expected: event id
if ($line and not $event) {
$event = $self->new_event;
$event->{id} = $self->trim($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 $linenum, skipped");
next;
}
unless (defined ($timing->[0] = $self->parse_timing($start))) {
$self->log(warn => "Can't parse timing at line $linenum: $start");
next;
}
unless (defined ($timing->[1] = $self->parse_timing($end))) {
$self->log(warn => "Can't parse timing at line $linenum: $end");
next;
}
$event->{timing} = $timing;
$rest = $self->trim($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;
$event->{style} //= {};
$event->{style}->{lc($1)} = $self->trim($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}) {
$self->log(debug => "Text line at $linenum -> append");
if ($event->{text}) {
$event->{text} .= $self->{eol} . $self->trim($line);
} else {
$event->{text} = $self->trim($line);
}
next;
}
}
# finalize last event
if ($event and $event->{timing} and $event->{text}) {
push @{ $self->{events} }, $event;
}
return scalar @{ $self->{events} };
}
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1;