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#
# Copyright 1999, 2000, 2001 Patrik Stridvall
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
#
package util;
use strict;
use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(
append_file edit_file read_file replace_file
normalize_set is_subset
);
@EXPORT_OK = qw();
%EXPORT_TAGS = ();
########################################################################
# _compare_files
sub _compare_files($$) {
my $file1 = shift;
my $file2 = shift;
local $/ = undef;
return -1 if !open(IN, "< $file1");
my $s1 = <IN>;
close(IN);
return 1 if !open(IN, "< $file2");
my $s2 = <IN>;
close(IN);
return $s1 cmp $s2;
}
########################################################################
# append_file
sub append_file($$@) {
my $filename = shift;
my $function = shift;
open(OUT, ">> $filename") || die "Can't open file '$filename'";
my $result = &$function(\*OUT, @_);
close(OUT);
return $result;
}
########################################################################
# edit_file
sub edit_file($$@) {
my $filename = shift;
my $function = shift;
open(IN, "< $filename") || die "Can't open file '$filename'";
open(OUT, "> $filename.tmp") || die "Can't open file '$filename.tmp'";
my $result = &$function(\*IN, \*OUT, @_);
close(IN);
close(OUT);
if($result) {
unlink("$filename");
rename("$filename.tmp", "$filename");
} else {
unlink("$filename.tmp");
}
return $result;
}
########################################################################
# read_file
sub read_file($$@) {
my $filename = shift;
my $function = shift;
open(IN, "< $filename") || die "Can't open file '$filename'";
my $result = &$function(\*IN, @_);
close(IN);
return $result;
}
########################################################################
# replace_file
sub replace_file($$@) {
my $filename = shift;
my $function = shift;
open(OUT, "> $filename.tmp") || die "Can't open file '$filename.tmp'";
my $result = &$function(\*OUT, @_);
close(OUT);
if($result && _compare_files($filename, "$filename.tmp")) {
unlink("$filename");
rename("$filename.tmp", $filename);
} else {
unlink("$filename.tmp");
}
return $result;
}
########################################################################
# normalize_set
sub normalize_set($) {
local $_ = shift;
if(!defined($_)) {
return undef;
}
my %hash = ();
foreach my $key (split(/\s*&\s*/)) {
$hash{$key}++;
}
return join(" & ", sort(keys(%hash)));
}
########################################################################
# is_subset
sub is_subset($$) {
my $subset = shift;
my $set = shift;
foreach my $subitem (split(/ & /, $subset)) {
my $match = 0;
foreach my $item (split(/ & /, $set)) {
if($subitem eq $item) {
$match = 1;
last;
}
}
if(!$match) {
return 0;
}
}
return 1;
}
1;
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