comp.lang.ruby

Luke Ivers

1/31/2007 5:33:00 PM

On Thu, 1 Feb 2007 02:26:49 +0900
B Mills <bmill@merion.com> wrote:

> Hi.
>
> I'm still kind of new to Ruby and scripting in general, and am trying to
> select specific entries from the plain text output of the Apple System
> Profiler which arranges data like this:
>
> Network:
>
> Internal Modem:
>
> Type: PPP (PPPSerial)
> Hardware: Modem
> BSD Device Name: modem
> IPv4:
> Configuration Method: PPP
> IPv6:
> Configuration Method: Automatic
> Proxies:
> FTP Passive Mode: Yes
>
> Built-in Ethernet:
>
> Type: Ethernet
> Hardware: Ethernet
> BSD Device Name: en0
> IPv4 Addresses: 10.3.9.249
>
> So on and so forth. (There is an XML output option, but it uses the
> Apple plist format, which provides very little useful structure and a
> much larger filesize). I want to find a way to parse this based on the
> number of preceding white spaces at the beginning of the line (and then
> by colon), so I can get a specific property from a Hash:
>
> profile['Network:'][ 'Built-in Ethernet:']['IPv4 Addresses:']
>
> I started out by using grep to create an array of of each level of
> indentation, and nesting loops to select a range between two indexes of
> that level:
>
> key1 = file.grep(/^\w/)
> key1.each do |k1|
> range1 = file.index(key1[key1.index(k1)]
> if k1 == key1.last
> range2 = range1
> else
> range2 = file.index(key1[key1.index(k1) + 1]
> end
> stub = file[range1...range2]
> key2 = stub.grep(^/\s\s\s\s\w/)
> key2.each do |k2|
> ....rinse and repeat...
> key3.each do |k3|
>
> ...and so on until I run out of indentation levels. I'm running into
> problems where the loop stops at the last element and won't dig down
> into anything below it. It also doesn't handle context, as there are
> duplicate values in the file. I also tend to have the problem of making
> things more complicated than they have to be, so I figure there is a
> more elegant and Ruby-ish way to do this. Any suggestions?
>
> --
> Posted via http://www.ruby-....
>
This is already built for using YAML... it's structured as YAML already.
If this is saved as a file named network.yml, you can do this:
profile = {}
File.open('network.yml') { |f| profile = YAML.load(f) }
You'll get the following
=> {"Network"=>{"Built-in Ethernet"=>{"BSD Device Name"=>"en0", "IPv4 Addresses"
=>"10.3.9.249", "Hardware"=>"Ethernet", "Type"=>"Ethernet"}, "Internal Modem"=>{
"Proxies"=>{"FTP Passive Mode"=>true}, "BSD Device Name"=>"modem", "IPv4"=>{"Con
figuration Method"=>"PPP"}, "IPv6"=>{"Configuration Method"=>"Automatic"}, "Hard
ware"=>"Modem", "Type"=>"PPP (PPPSerial)"}}}

Meaning you can do profile["Network"]["Build-in Ethernet"]...
You get the idea.
Gotta go eat lunch now.
--
Luke Ivers <technodolt@gmail.com>