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