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# Copyright (c) 2021 Teddy Wing
#
# This file is part of Incdec.
#
# Incdec is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Incdec is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Incdec. If not, see <https://www.gnu.org/licenses/>.
use strict;
use warnings;
package incdec;
sub incdec {
my ($line, $increment_by, $point_position, $is_backward) = @_;
$point_position ||= 0;
$is_backward ||= 0;
my $number_regex = '-?([1-9]\d*|0\D|0$)';
my $start_position = 0;
my $previous_match_start = 0;
my $i = 0;
while ($line =~ /($number_regex)/g) {
if ($is_backward) {
# Set start position to the current match start. This gives us the
# correct start position when incrementing the last number in a
# line.
$start_position = $-[0];
# Keep the start position of the first number if point is before
# the first number.
if ($i == 0 && $point_position < $-[0]) {
last;
}
# If point is not at the end, set start position to the number
# closest to the point position.
if ($point_position < $-[0]) {
$start_position = $previous_match_start;
last;
}
$previous_match_start = $-[0];
$i++;
}
else {
if ($point_position < $+[0]) {
$start_position = $-[0];
last;
}
}
}
pos($line) = $start_position;
$line =~ s/\G($number_regex)/$1 + $increment_by/e;
return ($line, $start_position);
}
1;
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