annotate scripts/miscellaneous/parseparams.m @ 29358:0a5b15007766 stable

update Octave Project Developers copyright for the new year In files that have the "Octave Project Developers" copyright notice, update for 2021.
author John W. Eaton <jwe@octave.org>
date Wed, 10 Feb 2021 09:52:15 -0500
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children 01de0045b2e3
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 2006-2021 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## -*- texinfo -*-
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27 ## @deftypefn {} {[@var{reg}, @var{prop}] =} parseparams (@var{params})
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28 ## @deftypefnx {} {[@var{reg}, @var{var1}, @dots{}] =} parseparams (@var{params}, @var{name1}, @var{default1}, @dots{})
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29 ## Return in @var{reg} the cell elements of @var{param} up to the first
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30 ## string element and in @var{prop} all remaining elements beginning with the
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31 ## first string element.
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32 ##
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33 ## For example:
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34 ##
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35 ## @example
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36 ## @group
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37 ## [reg, prop] = parseparams (@{1, 2, "linewidth", 10@})
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38 ## reg =
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39 ## @{
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40 ## [1,1] = 1
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41 ## [1,2] = 2
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42 ## @}
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43 ## prop =
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44 ## @{
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45 ## [1,1] = linewidth
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46 ## [1,2] = 10
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47 ## @}
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48 ## @end group
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49 ## @end example
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50 ##
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51 ## The parseparams function may be used to separate regular numeric arguments
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52 ## from additional arguments given as property/value pairs of the
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53 ## @var{varargin} cell array.
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54 ##
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55 ## In the second form of the call, available options are specified directly
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56 ## with their default values given as name-value pairs. If @var{params} do
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57 ## not form name-value pairs, or if an option occurs that does not match any
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58 ## of the available options, an error occurs.
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59 ##
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60 ## When called from an m-file function, the error is prefixed with the name
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61 ## of the caller function.
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62 ##
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63 ## The matching of options is case-insensitive.
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64 ##
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65 ## @seealso{varargin, inputParser}
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66 ## @end deftypefn
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67
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68 function [reg, varargout] = parseparams (params, varargin)
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69
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70 strs = cellfun ("isclass", params, "char");
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71 i = find (strs, 1);
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72 if (i)
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73 reg = params(1:i-1);
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74 prop = params(i:end);
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75 else
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76 reg = params;
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77 prop = {};
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78 endif
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79
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80 if (nargin == 1)
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81 varargout = {prop};
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82 else
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83 names = varargin(1:2:end);
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84 defaults = varargin(2:2:end);
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85 if (! size_equal (names, defaults))
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86 error ("parseparams: needs odd number of arguments");
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87 endif
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88 [names, sidx] = sort (toupper (names));
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89
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90 varargout = defaults;
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91 if (i)
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92 ## Let's parse the properties.
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93 pnames = prop(1:2:end);
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94 values = prop(2:2:end);
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95 if (! size_equal (pnames, values) || ! all (strs(i:2:end)))
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96 error_as_caller ("options must be given as name-value pairs");
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97 endif
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98 idx = lookup (names, toupper (pnames), "m");
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99 if (! all (idx))
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100 error_as_caller ("unrecognized option: %s", pnames{find (idx == 0, 1)});
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101 else
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102 varargout(sidx(idx)) = values;
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103 endif
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104 endif
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105 endif
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106
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107 endfunction
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108
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109 function error_as_caller (msg, varargin)
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110 stack = dbstack (1); # omit me
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111 fname = stack(min (2, end)).name;
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112 error ([fname, ": ", msg], varargin{:});
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113 endfunction
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114
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115
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116 %!test
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117 %! [reg, prop] = parseparams ({1, 2, "linewidth", 10});
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118 %! assert (reg, {[1], [2]});
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119 %! assert (prop, {"linewidth", 10});
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120 %!test
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121 %! [reg, prop] = parseparams ({1, 2, 3});
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122 %! assert (reg, {[1], [2], [3]});
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123 %! assert (isempty (prop));
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124 %!test
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125 %! [reg, prop] = parseparams ({"prop1", "val1"});
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126 %! assert (isempty (reg));
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127 %! assert (prop, {"prop1", "val1"});
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128 %!test
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129 %! [reg, prop1] = parseparams ({"linewidth", 5}, "linewidth", 10);
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130 %! assert (isempty (reg));
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131 %! assert (prop1, 5);
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132 %!test <*58533>
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133 %! [foo, bar1, bar2] = parseparams({ 0, "model", 1, "N", 2},"model", 4, "N", 5, "d", 6);
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134 %! assert (foo, {0});
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135 %! assert (bar1, 1);
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136 %! assert (bar2, 2);
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137
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138 %!error <needs odd number of arguments> parseparams ({1}, "linewidth")
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139 %!error <must be given as name-value pairs> parseparams ({1, "color"}, "linewidth", 5)
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140 %!error <unrecognized option: color> parseparams ({1, "color", 5}, "linewidth", 5)