# Pervasives-0.0.1 **URL:** \ **Category:** Ruby\ **Created:** [January 6, 2007, 7:30pm UTC](https://www.ruby-forum.com/t/pervasives-0-0-1/81269 "2007-01-06T19:30:51Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\ **Post date:** [January 6, 2007, 7:30pm UTC](https://www.ruby-forum.com/t/pervasives-0-0-1/81269/1 "2007-01-06T19:30:51Z")
NAME pervasives.rb SYNOPSIS access to pristine object state. if you don’t metaprogram you probably don’t need it INSTALL gem install pervasives URIS [http://rubyforge.org/projects/codeforpeople/](http://rubyforge.org/projects/codeforpeople/) [http://codeforpeople.com/lib/ruby](http://codeforpeople.com/lib/ruby) SAMPLES \<========\< samples/a.rb \>========\> ~ \> cat samples/a.rb ``` # # Pervasives allows objects' method to be accessed in a pristine ``` state, even # when some effort has been made to derride them # require ‘pervasives’ ``` class OpenStruct instance_methods.each{|m| undef_method m unless m[%r/__/]} def initialize @table = {} end def method_missing m, *a, &b case m.to_s when %r/[=]$/ @table[m.to_s.delete('=')] = a.shift when %r/[?!]$/ !!@table[m.to_s.delete('?!')] else @table[m.to_s] end end def inspect @table.inspect end end os = OpenStruct.new os.object_id = 42 os.send = 42 os.instance_eval = 42 p os p os.object_id p Pervasives.object_id(os) p os.send p Pervasives.send(os, "key=", "value") p os.instance_eval p Pervasives.instance_eval(os){ @table } ``` ~ \> ruby samples/a.rb ``` {"instance_eval"=>42, "send"=>42, "object_id"=>42} 42 -609487514 42 "value" 42 {"instance_eval"=>42, "send"=>42, "key"=>"value", "object_id"=>42} ``` \<========\< samples/b.rb \>========\> ~ \> cat samples/b.rb ``` # # sometimes it may be more convenient to use a Pervasives::Proxy ``` object # insteand of using Pervasives directly # require ‘pervasives’ ``` class BlankSlate instance_methods.each { |m| undef_method m unless m =~ /^__/ } def object_id() 42 end end bs = BlankSlate.new proxy = Pervasives::Proxy.new bs p bs.object_id p proxy.object_id ``` ~ \> ruby samples/b.rb ``` 42 -609489100 ``` \<========\< samples/c.rb \>========\> ~ \> cat samples/c.rb ``` # # the special '__' method accesses an object's Pervasives::Proxy # require 'pervasives' class BlankSlate instance_methods.each { |m| undef_method m unless m =~ /^__/ } def object_id() 42 end end bs = BlankSlate.new p bs.object_id p __(bs){ object_id } ``` ~ \> ruby samples/c.rb ``` 42 -609486982 ``` \<========\< samples/d.rb \>========\> ~ \> cat samples/d.rb ``` # # it all works for classes too # require 'pervasives' class C def self.new() raise end def inspect() 42 end end p( Pervasives.new(C) ) p( Pervasives::Proxy.new(C).new ) p( __(C).new ) ``` ~ \> ruby samples/d.rb ``` 42 42 42 ``` enjoy and send in yer comments/patches! -a ---
**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\ **Post date:** [January 6, 2007, 10:22pm UTC](https://www.ruby-forum.com/t/pervasives-0-0-1/81269/2 "2007-01-06T22:22:20Z")
removed\_email\_address@domain.invalid wrote: > enjoy and send in yer comments/patches! is this perhaps impossible b/c of callbacks? since any dot magic DSL is created via method\_missing how can we possibley remove all the methods including #method\_missing? and if we’re stuck with one exception, what does a half-dozen more really make (just so long as they have uncommon names)? t. ---
**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\ **Post date:** [January 19, 2007, 4:30pm UTC](https://www.ruby-forum.com/t/pervasives-0-0-1/81269/3 "2007-01-19T16:30:38Z")
removed\_email\_address@domain.invalid wrote: > enjoy and send in yer comments/patches! ``` _ = Pervasives _.send(obj, message) ``` T. ---
**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\ **Post date:** [January 19, 2007, 4:31pm UTC](https://www.ruby-forum.com/t/pervasives-0-0-1/81269/4 "2007-01-19T16:31:36Z")
On 1/6/07, Trans [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > removed\_email\_address@domain.invalid wrote: > > > enjoy and send in yer comments/patches! > > ``` > _ = Pervasives > > _.send(obj, message) > > ``` Ooh. I think that at least in the context of this lib, that’s reasonable enough. Surely concise ---
**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\ **Post date:** [September 25, 2007, 10:34pm UTC](https://www.ruby-forum.com/t/pervasives-0-0-1/81269/5 "2007-09-25T22:34:15Z")
On Sat, 6 Jan 2007, Trans wrote: > removed\_email\_address@domain.invalid wrote: > > > enjoy and send in yer comments/patches! > > \_ = Pervasives > > \_.send(obj, message) yeah - i thought about that, but i use ‘\_’ often in loops like hash.map{|k,\_| k.upcase} when i plan to ignore a block param. cheers. -a ---
**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\ **Post date:** [September 25, 2007, 10:52pm UTC](https://www.ruby-forum.com/t/pervasives-0-0-1/81269/6 "2007-09-25T22:52:36Z")
On 1/6/07, removed\_email\_address@domain.invalid [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > yeah - i thought about that, but i use ‘\_’ often in loops like > > hash.map{|k,\_| k.upcase} > > when i plan to ignore a block param. Hmm, also a good tip Ara, neat. ---
**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\ **Post date:** [January 19, 2007, 4:31pm UTC](https://www.ruby-forum.com/t/pervasives-0-0-1/81269/7 "2007-01-19T16:31:23Z")
removed\_email\_address@domain.invalid wrote: > NAME > > pervasives.rb > > SYNOPSIS > > access to pristine object state. if you don’t metaprogram you probably > don’t need it > [snip] > enjoy and send in yer comments/patches! well, of course i think it’s great that you took the time to do this. but i’m afraid i have an unfortunate little story to tell you. you see about a year ago i was working on my BasicObject implementation and how to deal with this exact problem. if you recall i brought up this very thing on ruby-talk. i had implemented my own version of Pervasives – i beleive it was call Meta and/or Inspect at first, but i later realized the methods fit well in ObjectSpace. tied to this I created a shortcut to these mthod via a proxy like yours but rather than ‘**(obj).foo’, mine was 'obj.**.foo.’. Hey, great mind think alike! 🙂 now the tragic ending… with my new lib in hand i went about reworking my meta code with it. well, it wasnt too long after that i realized it sucked. my meta-code become bloated, harder to read and slower – it just wasn’t worth it. and so i gave up on it. so that’ my little story and i fear the same will happen for you. i think if the issue is going to be truly addressed, we need to work on something more fundamental. btw eventually i just settled on using object\_class and object\_send aliases when need be (shadow methods **class** , **send** , etc. just got on my nerves) and lived with the over-ride imperfections. T.