Re: variables and scope

On Wed, 15 Apr 2009 14:01:55 +0200
Thomas Michael Hagen <[email protected]> wrote:

> in gerH builds, variables have scope. this means you can't use a
> variable you have defined where you want it; you have to send it
> there.

That was introduced in BlameBarack.

> thus, you need one of two things; either a keyword that labels the
> variable as global, or the ability to send more than one variable to a
> function call.
>
> are any of these two things possible in gerH?

It all comes down to where the variable is first defined:

[usak@cl-t090-563cl bin]$ cat test.crm
#!/usr/bin/crm
window
output /:*:_crm_version:\n/
isolate (:a:) /1/
call /:f:/
output /:*:a:\n/
call /:g:/
output /:*:a:\n/
call /:h:/
output /Then number :*:a: is the first digit in my secret string :*:b:\n\n/
exit
:f:
alter (:a:) /2/
return
:g:
isolate (:a:) /3/
return
:h:
isolate (:b:) /abc4efg/
match [:b:] (:a:) /[[:digit:]]/
return

[usak@cl-t090-563cl bin]$ /usr/local/bin/crm test.crm
20080630-BlameVT, rev 3952 (TRE 0.7.5 (LGPL, APPROX, WCHAR, MULTIBYTE))
2
3
Then number 4 is the first digit in my secret string abc4efg

[usak@cl-t090-563cl bin]$ /usr/bin/crm test.crm
20081111-BlameBarack, rev 5002 (TRE 0.7.5 (LGPL, APPROX, WCHAR, MULTIBYTE))
2
3
Then number 4 is the first digit in my secret string :b:

With 'generic' and GerH builds prior to BlameBarack, all variables were
global. With BB, a variable declared in the scope of a function is
private to that function, but side effects remain on return when a
function changes a global variable.

> and a more general question: where do i find comprehensive (and
> up-to-date) documentation for gerH builds?

The changelog on the download is your best source:
http://hebbut.net/Public.Offerings/crm114.html

Generally I run little laboratory programs like the one above when I
want to know about a behavior that seems to be inadequately documented
for my purposes. I'm all in favor of applying test-driven development,
design patterns, function overloading and other Object Oriented HooHaa
to building my CRM scripts.

Chris

------------------------------------------------------------------------------
This SF.net email is sponsored by:
High Quality Requirements in a Collaborative Environment.
Download a free trial of Rational Requirements Composer Now!
http://p.sf.net/sfu/www-ibm-com

_______________________________________________
Crm114-general mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/crm114-general

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)

iQEcBAEBAgAGBQJJ5jNSAAoJEASgqNsqZfCHGWgH/2pxmmAVT90Wt5/me5NLppcn
jy8FLuwgi+fFw2AaiEvfjB6Yq/qwFPAJBQevfb1LYdQNErfHWwdIebeNDKlwpCNK
J0f0YJKPUeF4GgwdJJRJNUGq5sSFUTV7v2Ee1FcM8FTt3y5idMAg3ajxkBq2FpIk
5cVrj8+r4Skk7hJ2ls4U2g+2zk8Z/KSmwmQqL8xn1cNDCiB31jkISFt7Dn5TEAKp
LLYWI2CjLOmziVXHbcbKmBt3u3iKonPIT/hCjTFJ5iXCyUYWMHcVCW97mNsnYdgJ
cNHweNJtDSEKz/pVPi8iTA2zPRUDOeF4BIcIOAosnRt3hZH80OuEcsJ54S/edLo=
=bn4L
-----END PGP SIGNATURE-----