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# -*- perl -*-
#
# Copyright (C) Heinz-Josef Claes (2002-2022)
# hjclaes@web.de
#
# This program 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.
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
#
use strict;
##################################################
sub splitLine
{
my $line = shift;
my $length = shift;
my $pattern = shift; # separator between words, normally '\s+'
my $newLine = shift; # normally "\n" or <undef>
my (@lines);
if ($newLine)
{
(@lines) = split($newLine, $line);
}
else
{
(@lines) = ($line);
}
my (@ret) = ();
foreach my $l (@lines)
{
push @ret, &::splitOneLine($l, $length, $pattern);
}
return @ret;
}
##################################################
sub splitOneLine
{
my $line = shift;
my $length = shift;
my $pattern = shift; # separator between words, nomally '\s+'
my @ret;
while (1)
{
if (length($line) <= $length)
{
push @ret, $line;
return @ret;
}
# line is too long
my $begin = substr($line, 0, $length);
$line = substr($line, $length);
if ($line =~ /^$pattern/) # if new line starts exactly with pattern
{
push @ret, $begin;
$line =~ s/^($pattern)//; # delete leading blanks or similar
next;
}
# split $begin
my ($a, $b) = $begin =~ /^(.*)$pattern(.*)$/;
if ($a)
{
push @ret, $a;
$line = $b . $line;
}
else # the first word is too long, simply split it
{
push @ret, $begin;
}
}
}
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