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09-27-2004 06:03 AM
09-27-2004 06:03 AM
LINE CODE --DIAGNOSTIC MESSAGE--
108 PRQ probable error using single-quote (')
It comes about when I set a local string symbol with:
$ SEARCH_WAIT_TIME := "00:03:00"
and use it later with:
$ WAIT 'SEARCH_WAIT_TIME
It definately works, it's been in use every 3 minutes for about a year.
Is it "wrong"?
Art
Solved! Go to Solution.
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09-27-2004 06:30 AM
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09-27-2004 06:30 AM
09-27-2004 06:30 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
well, I suppose if it works for you it's not totally wrong. I tried it and appears DCL is discarding your extra set of quotes...
$ SEARCH_WAIT_TIME := "00:03:00"
$ show symbol SEARCH_WAIT_TIME
SEARCH_WAIT_TIME = "00:03:00"
Correct form with the := and :== operators is to not use explicit quotes since all text to the right of the operator is already implicitly quoted...
$ SEARCH_WAIT_TIME := 00:03:00
$ show symbol SEARCH_WAIT_TIME
SEARCH_WAIT_TIME = "00:03:00"
Or, you could use the = or == operators which do not perform implicit quoting. Then it would be correct form to include explicit quotes.
$ show symbol SEARCH_WAIT_TIME
$ SEARCH_WAIT_TIME = "00:03:00"
I'm not sure if your method could result in substitution problems or limitations if the quoting and symbol substitution were signicantly more complicated than your example.
I was using...
$ show system/noproc
OpenVMS V7.3-2 on node CH21 27-SEP-2004 20:19:28.73 Uptime 28 07:04:01
Cheers!
Keith Cayemberg
Consultant
Wipro Technologies
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09-27-2004 06:37 AM
09-27-2004 06:37 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
Cheers!
Keith
Consultant
Wipro Technologies
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09-27-2004 06:38 AM
09-27-2004 06:38 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
It is possible to write scripts that are 100% warning free but sometimes you have to find a warning free syntax. E.g. goto's to a value of a symbol are hard to understand. E.g. symbol substitution. E.g. label formats (balnks before :).
Today I posted a dcl_check in zhich I cleaned out some of the messages that I found redundant (for me).
Wim
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09-27-2004 07:09 AM
09-27-2004 07:09 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
"The "official" syntax for sustitution calls for one trailing apostrophe; however, it is unnecessary in many cases." ... and then goes on to list the specific situations where it is. My situation it's not.
Another good quote is on page 68:
"Programmers are often confused about the context in which apostrophe substitution is required, and this results in overuse of the construct."
Just trying to live "by the book".
Thanks,
Art
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09-27-2004 07:36 AM
09-27-2004 07:36 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
I use 2 methods only (risk ?)
1) "''symbol'"
2) 'symbol'
Format 2 has no discussion of where the symbol ends. Why use the 'symbol ?
Of couse, dcl_check should recognize al formats but I think the author was convinced that my/his formats are the real ones.
Wim
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09-27-2004 08:06 AM
09-27-2004 08:06 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
'Cause if Steve Hoffman tells me it's unneccesary, I should probably listen!
;-)
Art
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09-27-2004 09:07 AM
09-27-2004 09:07 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
I think the DCL_CHECK author is suggesting its better style always to including for those occations when it is necessary.
Purely Personal Opinion
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09-29-2004 10:20 AM
09-29-2004 10:20 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
Note: While I am an HPE Employee, all of my comments (whether noted or not), are my own and are not any official representation of the company
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09-29-2004 08:39 PM
09-29-2004 08:39 PM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
Purely Personal Opinion
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09-30-2004 12:32 AM
09-30-2004 12:32 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
CHECK_DCL does not only check syntax per se,
but also checks for adherance to (some form of?) good practise.
In line therewith, just for my curiosity:
how about a check for consistent usage of indentation? Equally, or maybe even more interesting for humans who may have to work with the DCL's as well.
Cheers.
Have one on me
Jan
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09-30-2004 01:37 AM
09-30-2004 01:37 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
I can't find the reference right now, but there's another place where that's definately not the case and they are suggesting the exact opposite
"how about a check for consistent usage of indentation? "
That's a great subject to cause a thread to continue forever!! ;-)
Personally I find it very annoying to have line labels right next to the $ sign eg: $loop: Why not leave a space? When it's white text on a black screen at 132 col's (and your in your 40's) it gets a little blurry!
How about case? All upper, all lower, or a mix of commands upper, variables, symbols etc. lower? Make it look like a language and "camelback" it ie. $ LoopAgain:
Art
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09-30-2004 02:22 AM
09-30-2004 02:22 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
I DID NOT specify WHAT indentation, only CONSISTENT USE.
In my view that should mean:
If you start with label names having n (0=
If you start indenting your if-then-else constructs with m (1=
Especially the latter one would be a REAL help in debugging, especially in the case where different persons with personal styles have made changes some time in the past.
THAT, and only that, was my intention.
Cheers!
Have one on me.
Jan
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09-30-2004 03:19 AM
09-30-2004 03:19 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
All if-then-else statements must have their words alligned. Badly alligned scripts are unreadable.
I had the same for COBOL but that one is more complicated (runs every night since 1995 in a site were I worked). It also checked ifs with included statements against a maximum length. And much more.
Wim
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09-30-2004 03:24 AM
09-30-2004 03:24 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
Jan : have a lot (nen bak) on me !
Wim
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06-30-2005 12:05 AM
06-30-2005 12:05 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
has anyone an idea how could one insert in a string symbol an apostrophe ? i looked at Anagnostopoulos book.
Basically, it would be probably OK when i could defined a string of one char containing "'" and use a substring assignment as in Anagnostopoulos page 43, but DCL attempts a symbol substitution on it.
Thanks for any help
Louis
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06-30-2005 01:27 AM
06-30-2005 01:27 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
You can assign an apostrophe to a symbol by using the escape convention (doubling the character):
$ STRING = "''''"
$ WRITE SYS$ERROR STRING
Admittedly, the doubling rule is one of the more often confusing parts of DCL syntax.
- Bob Gezelter, http://www.rlgsc.com
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06-30-2005 05:15 AM
06-30-2005 05:15 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
and ANY character ( well, except %X0 ), most notably escape sequences, can be made by numeric assignment of the ASCII value.
eg:
$ esc[0,8]=27
(8 bits of the symbol "esc" get ASCII vaule 27, so ESC is the Escape character.
Look up any 8-bit character you need, and it works.
$ eur[0,8]=128 gives the Euro sign on the printer.
I can not look it up now, and I always confuse double-quote ans apostrophe, but one is 41 and the other 43.
Proost.
Have one on me.
jpe
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06-30-2005 06:21 AM
06-30-2005 06:21 AM
Re: DCL syntax - symbol substitution - DCL_CHECK.COM warning
CONSHY» string ="I can't."
CONSHY» write sys$output string
I can't.
Lawr