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###################################################
# utility functions to support pidl
# Copyright tridge@samba.org 2000
# released under the GNU GPL
package util;
use Data::Dumper;
#####################################################################
# flatten an array of arrays into a single array
sub FlattenArray($)
{
my $a = shift;
my @b;
for my $d (@{$a}) {
for my $d1 (@{$d}) {
push(@b, $d1);
}
}
return \@b;
}
#####################################################################
# flatten an array of hashes into a single hash
sub FlattenHash($)
{
my $a = shift;
my %b;
for my $d (@{$a}) {
for my $k (keys %{$d}) {
$b{$k} = $d->{$k};
}
}
return \%b;
}
#####################################################################
# traverse a perl data structure removing any empty arrays or
# hashes and any hash elements that map to undef
sub CleanData($)
{
sub CleanData($);
my($v) = shift;
if (ref($v) eq "ARRAY") {
foreach my $i (0 .. $#{$v}) {
CleanData($v->[$i]);
if (ref($v->[$i]) eq "ARRAY" && $#{$v->[$i]}==-1) { delete($v->[$i]); next; }
}
# this removes any undefined elements from the array
@{$v} = grep { defined $_ } @{$v};
} elsif (ref($v) eq "HASH") {
foreach my $x (keys %{$v}) {
CleanData($v->{$x});
if (!defined $v->{$x}) { delete($v->{$x}); next; }
if (ref($v->{$x}) eq "ARRAY" && $#{$v->{$x}}==-1) { delete($v->{$x}); next; }
}
}
}
#####################################################################
# return the modification time of a file
sub FileModtime($)
{
my($filename) = shift;
return (stat($filename))[9];
}
#####################################################################
# read a file into a string
sub FileLoad($)
{
my($filename) = shift;
local(*INPUTFILE);
open(INPUTFILE, $filename) || die "can't open $filename";
my($saved_delim) = $/;
undef $/;
my($data) = <INPUTFILE>;
close(INPUTFILE);
$/ = $saved_delim;
return $data;
}
#####################################################################
# write a string into a file
sub FileSave($$)
{
my($filename) = shift;
my($v) = shift;
local(*FILE);
open(FILE, ">$filename") || die "can't open $filename";
print FILE $v;
close(FILE);
}
#####################################################################
# return a filename with a changed extension
sub ChangeExtension($$)
{
my($fname) = shift;
my($ext) = shift;
if ($fname =~ /^(.*)\.(.*?)$/) {
return "$1.$ext";
}
return "$fname.$ext";
}
#####################################################################
# save a data structure into a file
sub SaveStructure($$)
{
my($filename) = shift;
my($v) = shift;
FileSave($filename, Dumper($v));
}
#####################################################################
# load a data structure from a file (as saved with SaveStructure)
sub LoadStructure($)
{
return eval FileLoad(shift);
}
1;
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