110 lines
3.2 KiB
Perl
110 lines
3.2 KiB
Perl
package C4::ClassSplitRoutine::RegEx;
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# Copyright 2018 Koha Development Team
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#
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# This file is part of Koha.
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#
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# Koha is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# Koha is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Koha; if not, see <http://www.gnu.org/licenses>.
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use Modern::Perl;
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use Koha::Logger;
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use Koha::Regex::Replacement;
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=head1 NAME
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C4::ClassSplitRoutine::RegEx - regex call number sorting key routine
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=head1 SYNOPSIS
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use C4::ClassSplitRoutine;
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my $cn_sort = C4::ClassSplitRoutine::RegEx::split_callnumber($cn_item, $regexs);
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=head1 FUNCTIONS
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=head2 split_callnumber
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my $cn_split = C4::ClassSplitRoutine::RegEx::split_callnumber($cn_item, $regexs);
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=cut
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sub split_callnumber {
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my ($cn_item, $regexs) = @_;
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for my $regex (@$regexs) {
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_apply_substitution( \$cn_item, $regex );
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}
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my @lines = split "\n", $cn_item;
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return @lines;
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}
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=head2 _apply_substitution
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_apply_substitution( \$string, $regex );
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Applies a single admin-configured s/// substitution to $string in place,
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without ever evaluating the input as code. The rule is parsed as
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C<s/PATTERN/REPLACEMENT/FLAGS> (any non-space delimiter is accepted); the pattern is compiled with
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qr// (so embedded-code assertions are treated as a runtime pattern and blocked
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by Perl), and the replacement is expanded as data via
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Koha::Regex::Replacement::expand_template. The
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/e flag is rejected and anything that is not a plain substitution is ignored.
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This replaces the previous C<eval "\$cn_item =~ $regex"> stringy eval, which
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executed arbitrary Perl.
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=cut
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sub _apply_substitution {
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my ( $ref, $regex ) = @_;
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return unless defined $regex;
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# Parse s<DELIM>PATTERN<DELIM>REPLACEMENT<DELIM>FLAGS, allowing any
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# non-space delimiter and backslash-escaped delimiters inside the pattern
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# and replacement. Anything that is not a well-formed plain substitution is
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# ignored rather than executed.
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return unless $regex =~ m{^s(\S)((?:\\.|(?!\1).)*)\1((?:\\.|(?!\1).)*)\1([a-z]*)\z}s;
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my ( $pattern, $replacement, $flags ) = ( $2, $3, $4 );
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return if $flags =~ /e/; # never evaluate the replacement as code
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my $global = $flags =~ /g/ ? 1 : 0;
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my $ci = $flags =~ /i/ ? '(?i)' : '';
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my $compiled = eval { qr/$ci$pattern/ };
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unless ( defined $compiled ) {
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Koha::Logger->get->warn("C4::ClassSplitRoutine::RegEx: failed to compile pattern [$pattern]: $@");
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return;
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}
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my $expand = sub { Koha::Regex::Replacement::expand_template( $replacement, [ @{^CAPTURE} ], {%+} ) };
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if ($global) {
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${$ref} =~ s/$compiled/$expand->()/ge;
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} else {
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${$ref} =~ s/$compiled/$expand->()/e;
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}
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return;
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}
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1;
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=head1 AUTHOR
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Koha Development Team <http://koha-community.org/>
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=cut
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