bugGNU Octave - Bugs: bug #38653, matlab ... continuation sequence...


bug #38653: matlab ... continuation sequence not supported

Submitter:  John Donoghue <lostbard>
Submitted:  Wed 03 Apr 2013 01:43:29 AM UTC
Category:  Interpreter Severity:  2 - Minor
Priority:  2 Item Group:  Matlab Compatibility
Status:  Fixed Assigned to:  None
Originator Name:  John Donoghue Open/Closed:  * Closed
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Thu 15 Aug 2013 11:22:34 PM UTC, comment #10: 

I pushed your documentation patch (http://hg.savannah.gnu.org/hgweb/octave/rev/a654c1eccd29).

Rik <rik5>
Group administrator
Thu 15 Aug 2013 01:38:48 PM UTC, comment #9: 

patch for doc.

(file #28851)

Stefan Mahr <dac922>
Wed 14 Aug 2013 04:44:58 PM UTC, comment #8: 

I pushed a series of changesets to ignore everything after the ... marker, use ... instead of \ in Octave sources, and then to deprecate \ outside of double-quoted character strings.



John W. Eaton <jwe>
Group administrator
Mon 12 Aug 2013 04:44:04 PM UTC, comment #7: 

Attached patch without deprecating \

(file #28821)

Stefan Mahr <dac922>
Mon 12 Aug 2013 04:05:14 PM UTC, comment #6: 

Attached patch fixes this bug and marks \ as deprecated (except for double quoted strings).

(file #28820)

Stefan Mahr <dac922>
Wed 19 Jun 2013 10:58:14 PM UTC, comment #5: 

It seems like Matlab is very obviously and explicitly turning everything after the continuation marker '...' into a comment.  We probably should do the same.

In the mean time, it is easy to workaround this and get the same behavior in Octave by using '... %' so that the line is a continuation and the comment character '%' causes Octave's parser to ignore the rest of the line.

S = 1 + 2 ... %anything after the ... is ignored
       - 2;

Rik <rik5>
Group administrator
Wed 03 Apr 2013 07:57:38 AM UTC, comment #4: 

such a behaviour isn't very new for Matlab, since Matlab7.0(R14) documentation has such a phrase:
"Three or more periods before the end of a line cause MATLAB to ignore the remaining text on the current line and continue the function on the next line. This effectively makes a comment out of anything on the current line that follows the three periods."

sergey plotnikov <nul0m>
Wed 03 Apr 2013 05:14:13 AM UTC, comment #3: 

OK, except that I think we'll want to handle "\.\.\." and "\\\n" differently now.  So maybe this is a good time to limit where these continuations can appear, and possibly deprecate the "\\\n" style.

John W. Eaton <jwe>
Group administrator
Wed 03 Apr 2013 05:08:20 AM UTC, comment #2: 

Or followed by whitespace or a comment.  I think we have allowed that for many years now.  If this isn't something new for Matlab, it's surprising that I've never seen a bug report about this until now.  In any case, it should be fairly easy to fix.

John W. Eaton <jwe>
Group administrator
Wed 03 Apr 2013 04:55:17 AM UTC, comment #1: 

I wonder if this is a rather new addition?  It seems that it used to be that '...' was only valid at the end of the line.  This is certainly what Octave currently implements.

Rik <rik5>
Group administrator
Wed 03 Apr 2013 01:43:29 AM UTC, original submission:  

Matlab '...' continuation sequence is not supported by the interpreter.

Test - this should be a valid command:

S = 1 + 2 ... anything after the ... is ignored
       - 2;

John Donoghue <lostbard>
Group Member


(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach Files:

Attached Files
file #28851:  continuation_lines_doc.diff added by dac922 (3KiB - text/x-patch)
file #28820:  continuationmarker.diff added by dac922 (34KiB - text/x-patch)


Depends on the following items: None found

Items that depend on this one: None found


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  • -email is unavailable- added by nul0m (Posted a comment)
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  • -email is unavailable- added by rik5 (Posted a comment)
  • -email is unavailable- added by lostbard (Submitted the item)

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    Follow 8 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2013-08-15 dac922 Attached File- Added continuation_lines_doc.diff, #28851
    2013-08-14 jwe StatusConfirmed Fixed
        Open/ClosedOpen Closed
    2013-08-12 dac922 Attached File- Added continuationmarker_wo_deprecating_backslash.diff, #28821
    2013-08-12 dac922 Attached File- Added continuationmarker.diff, #28820
    2013-04-03 rik5 Severity3 - Normal 2 - Minor
        Priority5 - Normal 2
        StatusNone Confirmed

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