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comp.lang.ruby

Unbalanced code snippet include

Peter Lynch

10/16/2006 2:20:00 AM

Is there a way to insert code which is unbalanced into Ruby source.
For example, I have a condition which is checked in many places, but
which i am not yet sure is the correct condition, so i want to keep only
that condition in an "include" library called "not yet completed
condition" or "condition which i reckon will change and it is used
everywhere".

This include library may contain this code -

if condition then

I would like to be able to insert this in my source code with an in situ
"include", but the Ruby include expects a complete block.

the source code would look like this-
includesnippet "C:/INSERTS/IFNOTBROKEN.RB.INS"

While you may think this is crazy, and i can certainly see your point,
this question is related to converting from another language to Ruby, so
i just have to ask.

Regards,
Peter

--
Posted via http://www.ruby-....
3 Answers

Rick DeNatale

10/16/2006 2:41:00 AM

0

On 10/15/06, Peter Lynch <argnosis@yahoo.com.au> wrote:
> Is there a way to insert code which is unbalanced into Ruby source.
> For example, I have a condition which is checked in many places, but
> which i am not yet sure is the correct condition, so i want to keep only
> that condition in an "include" library called "not yet completed
> condition" or "condition which i reckon will change and it is used
> everywhere".
>
> This include library may contain this code -
>
> if condition then
>
> I would like to be able to insert this in my source code with an in situ
> "include", but the Ruby include expects a complete block.
>
> the source code would look like this-
> includesnippet "C:/INSERTS/IFNOTBROKEN.RB.INS"
>
> While you may think this is crazy, and i can certainly see your point,
> this question is related to converting from another language to Ruby, so
> i just have to ask.

Include doesn't include a file, but a module.

You can do what you want with load but you need to work around the way
ruby treats line breaks, note how I left the if unfinished and closed
it after the load:

rick@frodo:/public/rubyscripts$ cat condition.rb
true
rick@frodo:/public/rubyscripts$ cat loadtest.rb
if (
load 'condition.rb'
)
puts "included file evaluated to 1"
else
puts "included file evaluated to non-1"
end

rick@frodo:/public/rubyscripts$ ruby loadtest.rb
included file evaluated to 1


--
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denh...

IPMS/USA Region 12 Coordinator
http://ipmsr12.denh...

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Rick DeNatale

10/16/2006 2:46:00 AM

0

On 10/15/06, Rick DeNatale <rick.denatale@gmail.com> wrote:
> On 10/15/06, Peter Lynch <argnosis@yahoo.com.au> wrote:

As an afterthought, having answered your question without analysis of
whether this is a good thing, there are probably saner approaches, two
which come to mind are:

1. defining the condition separately as a function or a lambda.
2. defining it as a string and using one of the eval family of
functions to evaluate it.

--
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denh...

Eero Saynatkari

10/16/2006 6:44:00 AM

0

On 2006.10.16 11:45, Rick DeNatale wrote:
> On 10/15/06, Rick DeNatale <rick.denatale@gmail.com> wrote:
> >On 10/15/06, Peter Lynch <argnosis@yahoo.com.au> wrote:
>
> As an afterthought, having answered your question without analysis of
> whether this is a good thing, there are probably saner approaches, two
> which come to mind are:
>
> 1. defining the condition separately as a function or a lambda.
> 2. defining it as a string and using one of the eval family of
> functions to evaluate it.

Definitely. The best thing to do would be to define a top-level
method for it, #require the file and then use the method in the
conditional. Maintaining the proposed scheme would probably be
a nightmare.