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comp.lang.ruby

Re: PP / PrettyPrint annoyances

Justin Collins

10/30/2006 7:30:00 AM

Elliot Winkler wrote:
> Hello all,
>
> PP/PrettyPrint comes in handy when I'm trying to inspect the contents of
> large arrays, but what if some elements are short length-wise?
>
> irb(main):001:0> require 'pp'
> => true
> irb(main):002:0> pp (0..20).to_a
> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
> 20]
> => nil
> irb(main):003:0> pp (0..40).to_a
> [0,
<snip long array
>
>
> This behavior is sort of ridiculous in my opinion. I'd rather have
> something
> more like:
>
> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
> 20,
> 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
> 39, 40]
>
> I've looked at the source code and documentation for PrettyPrint and
> PP but
> I don't understand how they work, so I'm not really sure how the classes
> could be extended so they work how I want them to work. I also tried
> numerous Google searches and it seems no one has a problem with the
> default
> behavior as I do. Can someone give me a hand here or at least point me in
> the right direction?

You could just use inspect (not sure if that's what you really want,
though):

irb(main):001:0> (0..100).to_a.inspect
=> "[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72,
73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90,
91, 92, 93, 94, 95, 96, 97, 98, 99, 100]"


-Justin
1 Answer

Jano Svitok

10/30/2006 11:43:00 PM

0

On 10/30/06, Elliot Winkler <elliot.winkler@gmail.com> wrote:
> #inspect would work if the array were simple, but the array I want to pretty
> print is not. I would give you the real case but it's really long, so a
> better example is:
>
> #!/usr/bin/ruby
> require 'pp'
> array = [
> { :key1 => 'value1', :key2 => 'value2', :key3 => 'value3' },
> 1, 2, 3,
> [
> 'foo', 'bar',
> [
> { :key1 => 'value1', :key2 => 'value2' },
> 'baz', 'quux'
> ]
> ]
> ]
> array2 = array.dup
> array2[4][2].push('a longer string', 'an even longer string')
>
> p array
> puts
> pp array
> puts
> p array2
> puts
> pp array2
>
> ==OUTPUT==
>
> [{:key1=>"value1", :key2=>"value2", :key3=>"value3"}, 1, 2, 3, ["foo",
> "bar", [{:key1=>"value1", :key2=>"value2"}, "baz", "quux"]]]
>
> [{:key1=>"value1", :key2=>"value2", :key3=>"value3"},
> 1,
> 2,
> 3,
> ["foo", "bar", [{:key1=>"value1", :key2=>"value2"}, "baz", "quux"]]]
>
> [{:key1=>"value1", :key2=>"value2", :key3=>"value3"}, 1, 2, 3, ["foo",
> "bar", [{:key1=>"value1", :key2=>"value2"}, "baz", "quux", "longer string",
> "even longer string"]]]
>
> [{:key1=>"value1", :key2=>"value2", :key3=>"value3"},
> 1,
> 2,
> 3,
> ["foo",
> "bar",
> [{:key1=>"value1", :key2=>"value2"},
> "baz",
> "quux",
> "longer string",
> "even longer string"]]]
>
> For array2, I want 1, 2, and 3 to be on one line, "foo" and "bar" to be one
> line, and "baz", "quux" and "longer string" to be one line. PP isn't doing
> that, obviously.
>
> Perhaps someone knows of another pretty print library?

I thought that changing Array#pretty_print would be sufficient, after
deeper look it seems that the problem is in the prettyprint module -
somewhere in the breaking routines - if the whole group (=array,
hash,...) is short enough to fit within the desired width (default
=79) then it's not split into line. Otherwise *every* line is split.
So it's a kind of take all or nothing deal.

The solution would be (better, harder) patching prettyprint.rb to
check the individual fields for overflow or (hack, posissibly easier)
to patch Array#pretty_print from pp.rb to add breakable just in the
desired places.