how can a take a string file name like MyTestCase.rb and change it to
my_test_case.rb?
thanks
On 6/30/07, Aaron S. [email protected] wrote:
how can a take a string file name like MyTestCase.rb and change it to
my_test_case.rb?
I’m a novice at Ruby, but this might help:
irb(main):013:0> ‘MyTestCase’.gsub(/[A-Z]/) {
irb(main):014:1* |p| ‘_’ + p.downcase
irb(main):015:1> }
=> “_my_test_case”
then:
irb(main):020:0> “_my_test_case”[1…-1]
=> “my_test_case”
Veterans can provide more succinct ways though 
Cheers,
Swaroop
Veterans can provide more succinct ways though
I wouldn’t consider myself a veteran yet, but here’s how Rails does it:
camel_cased_word.to_s.gsub(/::/, ‘/’).
gsub(/([A-Z]+)([A-Z][a-z])/,’\1_\2’).
gsub(/([a-z\d])([A-Z])/,’\1_\2’).
tr("-", “_”).
downcase
That also changes :: to /, so it’s handy for translating a module name
to a file path. It’s not exactly more succinct, but you can cut it down
as you see fit.
Brett
From: “Swaroop C H” [email protected]
then:
irb(main):020:0> “_my_test_case”[1…-1]
=> “my_test_case”
Here’s another way:
irb(main):078:0> “FooBarBaz”.split(/(?=[A-Z])/).map{|w|
w.downcase}.join(“_”)
=> “foo_bar_baz”
Regards,
Bill
John J. wrote:
On Jun 30, 2007, at 3:17 PM, Bill K. wrote:
=> “_my_test_case”
Regards,
Bill
Just be careful of any code that has dependencies on the camelCaps
version!
You might even write a conditional require statement to check for
both versions.
Thanks everyone!
On Jun 30, 2007, at 3:17 PM, Bill K. wrote:
=> “_my_test_case”
Regards,
Bill
Just be careful of any code that has dependencies on the camelCaps
version!
You might even write a conditional require statement to check for
both versions.
How about this:
“FooBarBaz”.split(/(?=[A-Z])/).join(’_’).downcase
On Saturday, June 30 2007, Bill K. wrote:
irb(main):015:1> }
w.downcase}.join("_") => “foo_bar_baz”
After seeing this split -> map -> join in my scripts, I came up with
smj:
class String
def smj(s, j=s, &b)
r = self.split(s).map(&b)
j ? r.join(j) : r
end
end
So the above would become:
“FooBarBaz”.smj(/(?=[A-Z])/, ‘_’) { |w| w.downcase } #=> “foo_bar_baz”
I love Pe…Ruby! I love Ruby!
-Ben Kudria
From: “Roseanne Z.” [email protected]
How about this:
“FooBarBaz”.split(/(?=[A-Z])/).join(‘_’).downcase
Nice… (why didn’t I think of that
Regards,
Bill
Aaron S. wrote:
how can a take a string file name like MyTestCase.rb and change it to
my_test_case.rb?thanks
Possibly overkill, but you can use ActiveSupport, it has this
functionality built in:
irb(main):001:0> require ‘rubygems’
=> true
irb(main):002:0> require ‘active_support’
=> true
irb(main):003:0> “ThisIsATest”.underscore
=> “this_is_a_test”
On Jul 2, 2007, at 9:41 AM, Bill K. wrote:
From: “Roseanne Z.” [email protected]
How about this:
“FooBarBaz”.split(/(?=[A-Z])/).join(‘_’).downcaseNice… (why didn’t I think of that
This is the cleanest I’ve come up with:
class String
“FooBar”.snake_case #=> “foo_bar”
def snake_case
gsub(/\B[A-Z]/, ‘_&’).downcase
end
end
Cheers-
– Ezra Z.
– Lead Rails Evangelist
– [email protected]
– Engine Y., Serious Rails Hosting
– (866) 518-YARD (9273)
On 8/22/07, Daniel B. [email protected] wrote:
“CheckHostIP”.gsub(/\B[A-Z]/, ‘_&’).downcase => “check_host_i_p”
But I want “check_host_ip”. It’s probably a simple tweak, but I’m
having trouble finding it at the moment. Suggestions?Thanks,
Dan
I guess there can be no general solution, I would like
HostIP → host_ip
but
AHostIP → a_host_ip
maybe you can use a dictonary of Uppercase Abbreviations as a
preparatory step?
Robert
On Jul 2, 11:42 am, Ezra Z. [email protected] wrote:
class String
“FooBar”.snake_case #=> “foo_bar”
def snake_case
gsub(/\B[A-Z]/, ‘_&’).downcase
end
end
Both of these solutions have a problem with back to back caps. For
example:
“CheckHostIP”.gsub(/\B[A-Z]/, ‘_&’).downcase => “check_host_i_p”
But I want “check_host_ip”. It’s probably a simple tweak, but I’m
having trouble finding it at the moment. Suggestions?
Thanks,
Dan
Hi –
On Thu, 23 Aug 2007, Robert D. wrote:
This is the cleanest I’ve come up with:
HostIP --> host_ip
but
AHostIP --> a_host_ip
Here’s how ActiveSupport does it:
def underscore(camel_cased_word)
camel_cased_word.to_s.gsub(/::/, ‘/’).
gsub(/([A-Z]+)([A-Z][a-z])/,’\1_\2’).
gsub(/([a-z\d])([A-Z])/,’\1_\2’).
tr("-", “_”).
downcase
end
David
On 8/22/07, David A. Black [email protected] wrote:
“FooBarBaz”.split(/(?=[A-Z])/).join(‘_’).downcase
endcamel_cased_word.to_s.gsub(/::/, '/'). gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2'). gsub(/([a-z\d])([A-Z])/,'\1_\2'). tr("-", "_"). downcaseend
David
Sure that is quite clever, but it will e.g. fail on “AMACAddress”
which I want to have as a_mac_address, well but that was a little side
issue of Dan, I guess this is the best solution for OP’s problem.
I just wanted to point Dan to the fact that he would need a dictionary.
Cheers
Robert
- Daniel B. [email protected] (2007-08-22) schrieb:
“CheckHostIP”.gsub(/\B[A-Z]/, ‘_&’).downcase => “check_host_i_p”
“CheckHostIP”.gsub(/\B[A-Z]+/, ‘_&’).downcase => “check_host_ip”
mfg, simon … l
On Aug 22, 2007, at 12:35 PM, Daniel B. wrote:
Both of these solutions have a problem with back to back caps. For
example:“CheckHostIP”.gsub(/\B[A-Z]/, ‘_&’).downcase => “check_host_i_p”
But I want “check_host_ip”. It’s probably a simple tweak, but I’m
having trouble finding it at the moment. Suggestions?
cfp:~ > cat a.rb
require ‘rubygems’
require ‘alib’
p(alib.util.snake_case(“CheckHostIP”))
cfp:~ > ruby a.rb
“check_host_ip”
def snake_case string
return string unless string =~ %r/[A-Z]/
string.reverse.scan(%r/[A-Z]+|[^A-Z]*[A-Z]+?/).reverse.map{|
word| word.reverse.downcase}.join ‘_’
end
kind regards.