[Octave-bug-tracker] [bug #62418] inputParser fails because of function not returning argument

[Georg Wiora]

URL:
  <https://savannah.gnu.org/bugs/?62418>

                 Summary: inputParser fails because of function not returning
argument
                 Project: GNU Octave
            Submitted by: gwiora
            Submitted on: Thu 05 May 2022 04:23:05 PM CEST
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  Status: None
             Assigned to: None
         Originator Name: gwiora
        Originator Email: 
             Open/Closed: Open
                 Release: 7.1.0
         Discussion Lock: Any
        Operating System: Microsoft Windows

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Details:

The validate_arg function fails in octave 7.1.0 at the marked position while
it worked up to 6.4 

function validate_arg (this, name, val, in)
        % Check validation result to be empty in case of the use of
validateattributes function
        % An empty result will be interpreted as valid arguments
-->        check = {val(in)};
        if (~isempty(check) && ~val(in))
          this.error (sprintf ("failed validation of %s with %s", toupper
(name),func2str(val)));
        endif
        this.Results.(name) = in;
    endfunction


The reason is that _val()_ is a function handle for _validateattributes()_
that checks the validity of the _in_ parameter and does only return a result
if the test fails. If everything is ok it does not return a result. 
This seems to be checked by the interpreter in the cell array operator:
_{val(in)}_ and the interpreter produces the follwoing error message:

error: validateattributes: function called with too many outputs
error: called from
    validateattributes
    dirPlus>@<anonymous> at line 142 column 22
    validate_arg at line 507 column 15
    parse at line 394 column 9
    dirPlus at line 177 column 3
    SPF_OctaveJobEval at line 62 column 11
stopped in validate_arg at line 507
[C:\Software\SPF_Backend_as\deployment\octave_service_image\workspace\inputParser.m]


It seems that the interpreter insists on having an output when called inside
the cell array operator. This is different from the previous behaviour.





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