When studying the Regina documentation about "address...with" there are three
environments, Regina
defines (see link and full text after the signature):
* "SYSTEM" with aliases "OS2ENVIRONMENT" and "ENVIRONMENT"
o standard, uses the operating system command line interpreter, shell
* "COMMAND" with aliases "CMD" and "PATH"
o does not use command line interpreter, shell, but rather the
environment loads the program
directly; fully qualified path can be given, otherwise PATH environment
variable will be
searched
* "REXX" alias "REGINA"
o creates a new instance of the interpreter to execute a Rexx script.
Assuming that over time Regina programs that have been using "address...with"
are executed with
ooRexx, it would be helpful, if the ooRexx implementation would allow such
Regina programs to be
executed without any changes, if possible.
Would supporting these Regina "address...with"-environments out of the box
(with their aliases) be a
feasible solution for the ooRexx implemenation?
---rony
P.S.: Excerpt from Regina 3.9.1 (April 2015) reference (regina391.pdf, one
direct link:
<ponce.cc/slackware/sources/repo/regina.pdf>), p. 28-29, documenting the above
mentioned three
environments:
... cut ...
"Regina uses three kinds of environments. Some have alias names. The
environment names are:
SYSTEM
alias OS2ENVIRONMENT
alias ENVIRONMENT
This is the default environment which is selected at startup. The standard
operating system
command line interpreter will be loaded to execute the commands. You can
use the built-in
commands of the command line interpreter, often called shell, or any other
program which the
command line interpreter can find and load.
COMMAND
alias CMD
alias PATH
This environment loads the named program directly. You may supply a path if
this is needed for
the current operating system to load the program, otherwise Regina uses the
standard operating
system search rules for programs. This is done by searching through the
items of the PATH
system-environment variable in most operation systems. You can't use
built-in shell
functionality like system redirections like you can with SYSTEM. Regina's
redirections are more
powerful and work in either environment.
REXX
alias REGINA
This environment uses a new instance of the Regina interpreter program to
execute a program. The
program has to be a Rexx script. This environment has several advantages.
The output of a script
can be redirected, the process is independent and a risk of a crash is
minimized when playing
with external libraries, finally, Regina itself tries to find the correct
Rexx interpreter by
itself and does everything to create a new incarnation of Regina.
The definition of Rexx says nothing about which environment is preselected
when you invoke the
interpreter, although TRL defines that one environment is automatically
preselected when
starting up a Rexx script. Note that there is no NONE environment in
standard Rexx, i.e. an
environment that ignores commands, but some interpreters implement the
TRACE setting ??? to
accomplish this. Regina uses the environment SYSTEM as the preselected
environment as mentioned
above. More implementation specific details can be found in the section
implementation specific
documentation for Regina.
The list of environments will be saved across subroutine calls; so the
effect of any ADDRESS
clauses in a subroutine will cease upon return from the subroutine."
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