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annotate scripts/general/nargoutchk.m @ 19833:9fc020886ae9

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maint: Clean up m-files to follow Octave coding conventions. Try to trim long lines to < 80 chars. Use '##' for single line comments. Use '(...)' around tests for if/elseif/switch/while. Abut cell indexing operator '{' next to variable. Abut array indexing operator '(' next to variable. Use space between negation operator '!' and following expression. Use two newlines between endfunction and start of %!test or %!demo code. Remove unnecessary parens grouping between short-circuit operators. Remove stray extra spaces (typos) between variables and assignment operators. Remove stray extra spaces from ends of lines.
author Rik <rik@octave.org>
date Mon, 23 Feb 2015 14:54:39 -0800
parents 4197fc428c7d
children 7503499a252b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 ## Copyright (C) 2008-2015 Bill Denney
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2 ## Copyright (C) 2012 Carnë Draug
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} nargoutchk (@var{minargs}, @var{maxargs})
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22 ## @deftypefnx {Function File} {@var{msgstr} =} nargoutchk (@var{minargs}, @var{maxargs}, @var{nargs})
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23 ## @deftypefnx {Function File} {@var{msgstr} =} nargoutchk (@var{minargs}, @var{maxargs}, @var{nargs}, "string")
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24 ## @deftypefnx {Function File} {@var{msgstruct} =} nargoutchk (@var{minargs}, @var{maxargs}, @var{nargs}, "struct")
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25 ## Check for correct number of output arguments.
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26 ##
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27 ## On the first form, returns an error unless the number of arguments in its
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28 ## caller is between the values of @var{minargs} and @var{maxargs}. It does
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29 ## nothing otherwise. Note that this function evaluates the value of
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30 ## @code{nargout} on the caller so its value must have not been tampered with.
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31 ##
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32 ## Both @var{minargs} and @var{maxargs} need to be a numeric scalar. Zero, Inf
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33 ## and negative are all valid, and they can have the same value.
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34 ##
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35 ## For backward compatibility reasons, the other forms return an appropriate
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36 ## error message string (or structure) if the number of outputs requested is
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37 ## invalid.
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38 ##
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39 ## This is useful for checking to see that the number of output
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40 ## arguments supplied to a function is within an acceptable range.
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41 ## @seealso{narginchk, error, nargout, nargin}
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42 ## @end deftypefn
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43
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44 ## Author: Bill Denney <bill@denney.ws>
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45 ## Author: Carnë Draug <carandraug+dev@gmail.com>
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46
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47 function msg = nargoutchk (minargs, maxargs, nargs, outtype)
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48
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49 ## before matlab's 2011b, nargoutchk would return an error message (just the
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50 ## message in a string). With 2011b, it no longer returns anything, it simply
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51 ## gives an error if the args number is incorrect.
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52 ## To try to keep compatibility with both versions, check nargout and nargin
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53 ## to guess if the caller is expecting a value (old syntax)
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54 ## or none (new syntax).
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55
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56 if (nargout == 1 && (nargin == 3 || nargin == 4))
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57
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58 if (minargs > maxargs)
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59 error ("nargoutchk: MINARGS must be <= MAXARGS");
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60 elseif (nargin == 3)
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61 outtype = "string";
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62 elseif (! any (strcmpi (outtype, {"string" "struct"})))
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63 error ("nargoutchk: output type must be either string or struct");
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64 elseif (! (isscalar (minargs) && isscalar (maxargs) && isscalar (nargs)))
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65 error ("nargoutchk: MINARGS, MAXARGS, and NARGS must be scalars");
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66 endif
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67
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68 msg = struct ("message", "", "identifier", "");
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69 if (nargs < minargs)
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70 msg.message = "not enough output arguments";
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71 msg.identifier = "Octave:nargoutchk:not-enough-outputs";
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72 elseif (nargs > maxargs)
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73 msg.message = "too many output arguments";
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74 msg.identifier = "Octave:nargoutchk:too-many-outputs";
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75 endif
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76
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77 if (strcmpi (outtype, "string"))
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78 msg = msg.message;
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79 elseif (isempty (msg.message))
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80 ## Compatibility: Matlab returns a 0x1 empty struct when nargoutchk passes
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81 msg = resize (msg, 0, 1);
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82 endif
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83
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84 elseif (nargout == 0 && nargin == 2)
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85
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86 if (! isnumeric (minargs) || ! isscalar (minargs))
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87 error ("minargs must be a numeric scalar");
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88 elseif (! isnumeric (maxargs) || ! isscalar (maxargs))
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89 error ("maxargs must be a numeric scalar");
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90 elseif (minargs > maxargs)
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91 error ("minargs cannot be larger than maxargs");
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92 endif
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93
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94 args = evalin ("caller", "nargout;");
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95
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96 if (args < minargs)
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97 error ("Not enough output arguments.");
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98 elseif (args > maxargs)
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99 error ("Too many output arguments.");
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100 endif
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101
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102 else
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103 print_usage;
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104 endif
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105
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106 endfunction
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107
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108
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109 %!shared stnul, stmin, stmax
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110 %! stnul = resize (struct ("message", "", "identifier", ""), 0, 1);
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111 %! stmin = struct ("message", "not enough output arguments",
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112 %! "identifier", "Octave:nargoutchk:not-enough-outputs");
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113 %! stmax = struct ("message", "too many output arguments",
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114 %! "identifier", "Octave:nargoutchk:too-many-outputs");
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115 %!assert (nargoutchk (0, 1, 0), "")
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116 %!assert (nargoutchk (0, 1, 1), "")
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117 %!assert (nargoutchk (1, 1, 0), "not enough output arguments")
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118 %!assert (nargoutchk (0, 1, 2), "too many output arguments")
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parents:
diff changeset
119 %!assert (nargoutchk (0, 1, 2, "string"), "too many output arguments")
1ce6460aebdf nargoutchk.m, validatestring.m, addtodate.m: new functions
bill@denney.ws
parents:
diff changeset
120 ## Struct outputs
14363
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks
Rik <octave@nomad.inbox5.com>
parents: 14138
diff changeset
121 %!assert (nargoutchk (0, 1, 0, "struct"), stnul)
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks
Rik <octave@nomad.inbox5.com>
parents: 14138
diff changeset
122 %!assert (nargoutchk (0, 1, 1, "struct"), stnul)
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a4d1581f9e72 Return correct struct for nargchk, nargoutchk (Bug #33808).
Rik <octave@nomad.inbox5.com>
parents: 12705
diff changeset
123 %!assert (nargoutchk (1, 1, 0, "struct"), stmin)
a4d1581f9e72 Return correct struct for nargchk, nargoutchk (Bug #33808).
Rik <octave@nomad.inbox5.com>
parents: 12705
diff changeset
124 %!assert (nargoutchk (0, 1, 2, "struct"), stmax)
a4d1581f9e72 Return correct struct for nargchk, nargoutchk (Bug #33808).
Rik <octave@nomad.inbox5.com>
parents: 12705
diff changeset
125