NOTE: use Perl; is on undef hiatus. You can read content, but you can't post it. More info will be forthcoming forthcomingly.
All the Perl that's Practical to Extract and Report
use Perl Log In
thoellri (4139)
Saturday June 11, 2005
07:20 AM
Foundation vs. Mac::Propertylist
I needed to access iPhoto's AlbumData.xml file in order to read my iPhoto database.
Mac::iPhoto did not work for me it always failed loading the xml-file (now I know why).
Mac::PropertyList would work after massaging the XML data before handing it of to plist_parse. However the solution was painfully slow. My 600KB AlbumData.xml file took more than 30 secs to load and parse on a Mac Mini.
So I looked into other ways to load the data from AlbumData.xml. Via PerlObjCBridge I implemented some code using NSPropertyListSerialization. I'm happy to report that the 30 secs have turned into 3 secs. That's better ...
The data returned from plistToHash and loadiPhotoDB are different! There are some data types missing in the plistTraverse() sub!
--------------------------------------------------
use strict;
use Foundation;
use Mac::PropertyList;
use Time::HiRes qw{gettimeofday tv_interval};
use constant XML => qq{$ENV{HOME}/Pictures/iPhoto Library/AlbumData.xml};
my $t0 = [gettimeofday];
my $hash=plistToHash(XML);
my $elapsed = tv_interval($t0);
print "using plistToHash = $elapsed\n";
$t0 = [gettimeofday];
$hash=loadiPhotoDB(XML);
$elapsed = tv_interval($t0);
print "using Mac::PropertyList = $elapsed\n";
sub plistToHash {
my($filename)=@_;
my $data=NSData->dataWithContentsOfFile_($filename);
return undef unless($data);
my $plist=NSPropertyListSerialization->propertyListFromData_mutabilityOption_format _errorDescription_($data,0,undef,undef);
return undef unless($plist);
my %dict=();
return plistTraverse(\%dict,$plist,'dict',0);
}
sub plistTraverse {
my($dest,$src,$type,$depth)=@_;
my $e=($type eq 'dict')?$src->keyEnumerator():$src->objectEnumerator;
while(my $next = $e->nextObject()) {
last unless($$next);
my $obj=($type eq 'dict')?$src->objectForKey_($next):$next;
my $class=$obj->className->cString();
my $keyString=($type eq 'dict')?$next->cString:"";
if($class =~ /dictionary$/i){
my %dict=();
my $sub=plistTraverse(\%dict,$obj,'dict',$depth+1);
if($type eq 'dict') {
$dest->{$keyString}=$sub;
}else{
push(@$dest,$sub);
}
}elsif($class =~ /array$/i){
my @array=();
my $sub=plistTraverse(\@array,$obj,'array',$depth+1);
if($type eq 'dict') {
$dest->{$keyString}=$sub;
}else{
push(@$dest,$sub);
}
}elsif($class =~ /string$/i){
if($type eq 'dict') {
$dest->{$keyString}=$obj->cString;
} else {
push(@$dest,$obj->cString);
}
}elsif($class =~ /number$/i){
if($type eq 'dict') {
$dest->{$keyString}=$obj->doubleValue;
} else {
push(@$dest,$obj->doubleValue);
}
}elsif($class =~ /boolean$/i){
if($type eq 'dict') {
$dest->{$keyString}=($obj->boolValue eq 'YES')?1:0;
} else {
push(@$dest,($obj->boolValue eq 'YES')?1:0);
}
} else {
print STDERR "**** unhandled class: $class\n";
}
}
return $dest;
}
sub loadiPhotoDB {
my($catalogPath)=@_;
my $xml;
open(CATALOG, $catalogPath) || return undef;
{local $/=undef;$xml=<CATALOG>;}
close(CATALOG);
# Mac::PropertyList is pretty strict about what it expects to
# see in the XML file. We are trimming the file before handing
# it off to parse_plist
$xml =~ s{^.*<plist\s*.*?>\s*}{}s;
$xml =~ s{\s*</plist\s*.*?>\s*\z}{}s;
my $dict=Mac::PropertyList::parse_plist($xml);
return $dict;
}
Mac::iPhoto did not work for me it always failed loading the xml-file (now I know why).
Mac::PropertyList would work after massaging the XML data before handing it of to plist_parse. However the solution was painfully slow. My 600KB AlbumData.xml file took more than 30 secs to load and parse on a Mac Mini.
So I looked into other ways to load the data from AlbumData.xml. Via PerlObjCBridge I implemented some code using NSPropertyListSerialization. I'm happy to report that the 30 secs have turned into 3 secs. That's better
The data returned from plistToHash and loadiPhotoDB are different! There are some data types missing in the plistTraverse() sub!
--------------------------------------------------
use strict;
use Foundation;
use Mac::PropertyList;
use Time::HiRes qw{gettimeofday tv_interval};
use constant XML => qq{$ENV{HOME}/Pictures/iPhoto Library/AlbumData.xml};
my $t0 = [gettimeofday];
my $hash=plistToHash(XML);
my $elapsed = tv_interval($t0);
print "using plistToHash = $elapsed\n";
$t0 = [gettimeofday];
$hash=loadiPhotoDB(XML);
$elapsed = tv_interval($t0);
print "using Mac::PropertyList = $elapsed\n";
sub plistToHash {
my($filename)=@_;
my $data=NSData->dataWithContentsOfFile_($filename);
return undef unless($data);
my $plist=NSPropertyListSerialization->propertyListFromData_mutabilityOption_forma
return undef unless($plist);
my %dict=();
return plistTraverse(\%dict,$plist,'dict',0);
}
sub plistTraverse {
my($dest,$src,$type,$depth)=@_;
my $e=($type eq 'dict')?$src->keyEnumerator():$src->objectEnumerator;
while(my $next = $e->nextObject()) {
last unless($$next);
my $obj=($type eq 'dict')?$src->objectForKey_($next):$next;
my $class=$obj->className->cString();
my $keyString=($type eq 'dict')?$next->cString:"";
if($class =~
my %dict=();
my $sub=plistTraverse(\%dict,$obj,'dict',$depth+1);
if($type eq 'dict') {
$dest->{$keyString}=$sub;
}else{
push(@$dest,$sub);
}
}elsif($class =~
my @array=();
my $sub=plistTraverse(\@array,$obj,'array',$depth+1);
if($type eq 'dict') {
$dest->{$keyString}=$sub;
}else{
push(@$dest,$sub);
}
}elsif($class =~
if($type eq 'dict') {
$dest->{$keyString}=$obj->cString;
} else {
push(@$dest,$obj->cString);
}
}elsif($class =~
if($type eq 'dict') {
$dest->{$keyString}=$obj->doubleValue;
} else {
push(@$dest,$obj->doubleValue);
}
}elsif($class =~
if($type eq 'dict') {
$dest->{$keyString}=($obj->boolValue eq 'YES')?1:0;
} else {
push(@$dest,($obj->boolValue eq 'YES')?1:0);
}
} else {
print STDERR "**** unhandled class: $class\n";
}
}
return $dest;
}
sub loadiPhotoDB {
my($catalogPath)=@_;
my $xml;
open(CATALOG, $catalogPath) || return undef;
{local $/=undef;$xml=<CATALOG>;}
close(CATALOG);
# Mac::PropertyList is pretty strict about what it expects to
# see in the XML file. We are trimming the file before handing
# it off to parse_plist
$xml =~ s{^.*<plist\s*.*?>\s*}{}s;
$xml =~ s{\s*</plist\s*.*?>\s*\z}{}s;
my $dict=Mac::PropertyList::parse_plist($xml);
return $dict;
}
because that's exactly how much difference there is. :-)
--Larry Wall in <10209@jpl-devvax.JPL.NASA.GOV>
Stories, comments, journals, and other submissions on use Perl; are Copyright 1998-2006, their respective owners.
