bugGNU Octave - Bugs: bug #41629, "set (h)" should not...


bug #41629: "set (h)" should not return read only properties

Submitted by:  Pantxo Diribarne <pantxo>
Submitted on:  Mon 17 Feb 2014 11:37:01 PM UTC  
Category:  Plotting Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Incorrect Result
Status:  Fixed Assigned to:  None
Originator Name:  Open/Closed:  Closed
Release:  dev Operating System:  Any

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Tue 18 Mar 2014 03:35:29 PM UTC, comment #5: 

I applied your changesets (http://hg.savannah.gnu.org/hgweb/octave/rev/8d5cb159fbc7, http://hg.savannah.gnu.org/hgweb/octave/rev/5264b0ec9f97).  With this in place, I think I we can return back to bug #35511 and getting "reset (h)" to work.

Rik <rik5>
Project Administrator
Mon 17 Mar 2014 09:57:52 PM UTC, comment #4: 

AFAICS there is no equivalent of base_graphics_object/graphics_object for proeprties, so that there is no way other than explicitly calling static function to call e.g axes::properties::... mehtods.
The two attached patches (to be applied one after the other) avoid static calls by implementing has_readonly_property for all graphics objects.

(file #30932, file #30933)

Pantxo Diribarne <pantxo>
Project Member
Mon 17 Mar 2014 01:27:14 AM UTC, comment #3: 

I applied the two patches together and they appear to work.  I'm uploading the consolidated changeset so you can see the final result.

One thing I wondered about was the dispatch table in the is_readonly function.  Is there any way to get C++ to do this for us?  Below is a small portion of the dispatch table.

static bool
is_readonly (const graphics_object obj, const std::string& pname)
  bool retval = false;

  if (obj.isa ("root_figure"))
      retval = root_figure::properties::has_readonly_property (pname);
  else if (obj.isa ("figure"))
      retval = figure::properties::has_readonly_property (pname)

It seems like there ought to be a way to call something like the following

retval = obj.has_readonly_property (pname);

because the object already knows what it is and has an overloaded instance of the has_readonly_property method depending on what kind of object it is.  The syntax above doesn't work though.

(file #30923)

Rik <rik5>
Project Administrator
Wed 19 Feb 2014 12:18:47 PM UTC, comment #2: 

Attached is a second patch (to be applied after the first one) that makes the original example work as expected.

(file #30606)

Pantxo Diribarne <pantxo>
Project Member
Tue 18 Feb 2014 04:12:56 PM UTC, comment #1: 

I went ahead to propose a method to determine whether a variable is readonly.

In the attached changeset I modified genprops.awk to generate readonly_property_names/has_readonly_property methods. They are basically identical to core_property_names/has_core_property methods except they list read-only properties.

I also modified set methods in order to let them report if a property is read only:

octave:2> set (gcf, "type", "toto")
error: set: "type" is read-only

If the approach is approved, I may address this bug.

(file #30596)

Pantxo Diribarne <pantxo>
Project Member
Mon 17 Feb 2014 11:37:01 PM UTC, original submission:  

In octave the following returns true:

ax = axes ();
isfield (set (ax), "tightinset")  ## returns true

As in Matlab, "tightinset" is read only and the test should return false.

I could not find a way (but try/catch) to determine programmatically whether a property is read only, neither in octave language, nor on the c++ side.

Pantxo Diribarne <pantxo>
Project Member


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

Attach Files:

Attached Files
file #30923:  ro_props.cset added by rik5 (8KiB - application/octet-stream)


Depends on the following items: None found

Items that depend on this one: None found


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    Follow 7 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2014-03-18 rik5 StatusNone => Fixed
        Open/ClosedOpen => Closed
    2014-03-17 pantxo Attached File- => Added readonly_part1_bug41629.patch, #30932
        Attached File- => Added readonly_part2_bug41629.patch, #30933
    2014-03-17 rik5 Attached File- => Added ro_props.cset, #30923
    2014-02-19 pantxo Attached File- => Added report_readonly_2_bug41629.patch, #30606
    2014-02-18 pantxo Attached File- => Added report_readonly_bug41629.patch, #30596

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