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nargchk.m: improve compatibility; new tests
author Peter L. Sondergaard <peter@sonderport.dk>
date Thu, 15 Jan 2009 01:06:06 -0500
parents 1ce6460aebdf
children e07e93c04080
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1 ## Copyright (C) 2008 Bill Denney
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {@var{msgstr} =} nargchk (@var{minargs}, @var{maxargs}, @var{nargs})
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21 ## @deftypefnx {Function File} {@var{msgstr} =} nargchk (@var{minargs}, @var{maxargs}, @var{nargs}, "string")
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22 ## @deftypefnx {Function File} {@var{msgstruct} =} nargchk (@var{minargs}, @var{maxargs}, @var{nargs}, "struct")
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23 ## Return an appropriate error message string (or structure) if the
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24 ## number of inputs requested is invalid.
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25 ##
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26 ## This is useful for checking to see that the number of input arguments
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27 ## supplied to a function is within an acceptable range.
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28 ## @seealso{nargoutchk, error, nargin, nargout}
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29 ## @end deftypefn
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30
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31 ## Author: Bill Denney <bill@denney.ws>
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32
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33 function msg = nargchk (mina, maxa, narg, outtype)
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35 if (nargin < 3 || nargin > 4)
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36 print_usage ();
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37 elseif (mina > maxa)
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38 error ("nargchk: minargs must be <= maxargs");
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39 elseif (nargin == 3)
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40 outtype = "string";
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41 elseif (! any (strcmpi (outtype, {"string" "struct"})))
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42 error ("nargchk: output type must be either string or struct");
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43 elseif (! (isscalar (mina) && isscalar (maxa) && isscalar (narg)))
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44 error ("nargchk: mina, maxa, and narg must be scalars");
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45 endif
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46
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47 msg = struct ("message", "", "identifier", "");
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48 if (narg < mina)
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49 msg.message = "not enough input arguments";
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50 msg.identifier = "Octave:nargchk:not-enough-inputs";
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51 elseif (narg > maxa)
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52 msg.message = "too many input arguments";
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53 msg.identifier = "Octave:nargchk:too-many-inputs";
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54 endif
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55
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56 if (strcmpi (outtype, "string"))
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57 msg = msg.message;
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58 else
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59 if (isempty (msg.message))
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60 msg = struct ([]);
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61 endif
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62 ## FIXME: remove the error below if error is modified to accept
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63 ## struct inputs
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64 error ("nargchk: error does not yet support struct inputs")
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65 endif
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66
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67 endfunction
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68
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69 ## Tests
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70 %!shared stmin, stmax
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71 %! stmin = struct ("message", "not enough input arguments",
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72 %! "identifier", "Octave:nargchk:not-enough-inputs");
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73 %! stmax = struct ("message", "too many input arguments",
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74 %! "identifier", "Octave:nargchk:too-many-inputs");
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75 %!assert (nargchk (0, 1, 0), "")
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76 %!assert (nargchk (0, 1, 1), "")
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77 %!assert (nargchk (1, 1, 0), "not enough input arguments")
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78 %!assert (nargchk (0, 1, 2), "too many input arguments")
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79 %!assert (nargchk (0, 1, 2, "string"), "too many input arguments")
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80 ## Struct outputs
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81 #%!assert (nargchk (0, 1, 0, "struct"), struct([]))
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82 #%!assert (nargchk (0, 1, 1, "struct"), struct([]))
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83 #%!assert (nargchk (1, 1, 0, "struct"), stmin)
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84 #%!assert (nargchk (0, 1, 2, "struct"), stmax)