#333 clarify DO/LOOP reserved keywords in expressions

[Josep Maria Blasco]

Rexxref 2.4 DO, note 9, says:

[...] Similarly, TO, BY, and FOR cannot be used in expri, exprt, exprb, or exprf. [...] However, parentheses around or within an expression can prevent these keywords from terminating an expression.

This does not work when TO, BY or FOR are used as variable reference terms. For example, in

to = 3
Do i = >to to 4
  Say i
End

line 2 should produce an error, because the first "to" token should be taken to be a reserved sub-keyword, and then expri would be ">", which is an invalid expression.

My impression is that the interpreter should be fixed to honor note 9. Otherwise, this special behaviour should be documented.

[Rick McGuire]

I think I have to agree with Josep in this case. Consider the following:

do i = a~to to 6; say hi; end
Oooops ! ... try again. String or symbol expected.
String or symbol expected after tilde (~).

The TO is recognized as being a reserved word and thus an expression
terminator even though it is part of a message term just like >to would be.
I actually prefer the way ">to" is working currently, but both cases should
be working the same way.

On Mon, Sep 2, 2024 at 12:42 PM Josep Maria Blasco jmblasc2@users.sourceforge.net wrote:

---

[bugs:#1974] Reserved subkeywords not working when used as variable
reference terms

Status: open
Group: 5.1.0
Created: Mon Sep 02, 2024 04:42 PM UTC by Josep Maria Blasco
Last Updated: Mon Sep 02, 2024 04:42 PM UTC
Owner: nobody

Rexxref 2.4 DO, note 9, says:

[...] Similarly, TO, BY, and FOR cannot be used in expri, exprt, exprb,
or exprf. [...] However, parentheses around or within an expression can
prevent these keywords from terminating an expression.

This does not work when TO, BY or FOR are used as variable reference
terms. For example, in

~~~
to = 3
Do i = >to to 4
Say i
End
~~~

line 2 should produce an error, because the first "to" token should be
taken to be a reserved sub-keyword, and then expri would be ">", which is
an invalid expression.

My impression is that the interpreter should be fixed to honor note 9.
Otherwise, this special behaviour should be documented.

---

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[Erich]

Ticket moved from /p/oorexx/bugs/1974/

Can't be converted:

• _pending_work_items: none

[Erich]

updated rexxref with [r12892] to clarify reserved DO/LOOP keywords can be used in certain terms even without parens.
also opened [feature-requests:#844] Allow reserved keywords in DO/LOOP expression message terms