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Hello everybody

A colleague of mine asked me if I knew how to automatically indent an LDAP filter to make it more readable. E.g.: he wantend something like this:

(&(&(&(& (mailnickname=*) (| (&(objectCategory=person)(objectClass=use +r)(!(homeMDB=*))(!(msExchHomeServerName=*)))(&(objectCategory=person) +(objectClass=user)(|(homeMDB=*)(msExchHomeServerName=*)))(&(objectCat +egory=person)(objectClass=contact))(objectCategory=group)(objectCateg +ory=publicFolder)(objectCategory=msExchDynamicDistributionList) )))(o +bjectCategory=contact)(proxyAddresses=smtp:*

to become something more similar to this

(& (& (& (& (mailnickname=*) (| (& (objectCategory=person) (objectClass=user) (! (homeMDB=*) ) (! (msExchHomeServerName=*) ) ) (& (objectCategory=person) (objectClass=user) (| (homeMDB=*) (msExchHomeServerName=*) ) ) (& (objectCategory=person) (objectClass=contact) ) (objectCategory=group) (objectCategory=publicFolder) (objectCategory=msExchDynamicDistributionList) ) ) ) (objectCategory=contact) (proxyAddresses=smtp:* ) )

I didn't want to spend a long time over this, so after a few attempts with the trial-and-error technique and with the help of Devel::ptkdb I came out with this quick and dirty script based on Text::Balanced

#!/usr/bin/perl use strict ; use warnings ; use Text::Balanced qw(extract_multiple) ; die "Uso: $0 filtro\n" unless @ARGV ; my ($begop,$begin,$end) = (qr/\([&|!]\s*/, qr/\(\s*/, qr/\)\s*/) ; my $filter = shift @ARGV ; my @blocks = extract_multiple($filter,[$begop]) ; my $step = 0 ; foreach my $block (@blocks) { if ($block =~ $begop) { # Inizia un operatore print_chunk($step++,$block,1) ; } else { # E` un blocco di match, probabilmente sbilanciato my @matches = extract_multiple($block,[$begin,$end]) ; # Questi sono match while (@matches >= 3) { my @chunks = splice(@matches,0,3) ; # Fai check sui "chunk" e agisci di conseguenza: if ($chunks[1] =~ /=/) { # E` un match: print_chunk($step,join("",@chunks),1) ; } else { # Sfiga while (my $chunk = shift @chunks) { if ($chunk =~ $end) { print_chunk(--$step,$chunk,1) ; } else { # Ricarica gli elementi in @matches e riparti unshift @matches,$chunk,@chunks ; last ; } } } } # Queste sono parentesi che si chiudono drop_parenses(@matches) ; } } sub print_chunk { my ($step,$string,$newline) = @_ ; print " "x$step ; print $string ; print "\n" if $newline ; } sub drop_parenses { while (my $parens = shift @_) { print_chunk(--$step,$parens,1) ; } }

I am pretty sure that there are far better ways to do that, and I am interested on how you'd do it. Anyone?


In theory, there is no difference between theory and practice. In practice, there is.

In reply to Making an LDAP filter more readable by bronto

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