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annotate scripts/strings/validatestring.m @ 12007:dc56a38b5a64 release-3-2-x

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var.m: fix typos (thinkos?) in previous change
author John W. Eaton <jwe@octave.org>
date Tue, 23 Jun 2009 12:57:57 +0200
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children be55736a0783
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1 ## Copyright (C) 2008, 2009 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{validstr} =} validatestring (@var{str}, @var{strarray})
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21 ## @deftypefnx {Function File} {@var{validstr} =} validatestring (@var{str}, @var{strarray}, @var{funcname})
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22 ## @deftypefnx {Function File} {@var{validstr} =} validatestring (@var{str}, @var{strarray}, @var{funcname}, @var{varname})
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23 ## @deftypefnx {Function File} {@var{validstr} =} validatestring (@dots{}, @var{position})
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24 ## Verify that @var{str} is a string or substring of an element of
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25 ## @var{strarray}.
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26 ##
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27 ## @var{str} is a character string to be tested, and @var{strarray} is a
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28 ## cellstr of valid values. @var{validstr} will be the validated form
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29 ## of @var{str} where validation is defined as @var{str} being a member
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30 ## or substring of @var{validstr}. If @var{str} is a substring of
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31 ## @var{validstr} and there are multiple matches, the shortest match
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32 ## will be returned if all matches are substrings of each other, and an
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33 ## error will be raised if the matches are not substrings of each other.
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34 ##
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35 ## All comparisons are case insensitive.
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36 ## @seealso{strcmp, strcmpi}
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37 ## @end deftypefn
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38
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39 ## Author: Bill Denney <bill@denney.ws>
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40
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41 function str = validatestring (str, strarray, varargin)
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42
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43 if (nargin < 2 || nargin > 5)
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44 print_usage ();
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45 endif
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46
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47 ## set the defaults
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48 funcname = "";
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49 varname = "";
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50 position = 0;
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51 ## set the actual values
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52 if (! isempty (varargin))
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53 if (isnumeric (varargin{end}))
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54 position = varargin{end};
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55 varargin(end) = [];
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56 endif
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57 endif
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58 funcnameset = false;
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59 varnameset = false;
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60 for i = 1:numel (varargin)
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61 if (ischar (varargin{i}))
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62 if (varnameset)
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63 error ("validatestring: invalid number of character inputs: %d",
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64 numel (varargin));
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65 elseif (funcnameset)
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66 varname = varargin{i};
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67 varnameset = true;
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68 else
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69 funcname = varargin{i};
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70 funcnameset = true;
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71 endif
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72 endif
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73 endfor
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74
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75 ## Check the inputs
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76 if (! ischar (str))
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77 error ("validatestring: str must be a character string");
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78 elseif (rows (str) != 1)
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79 error ("validatestring: str must have only one row");
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80 elseif (! iscellstr (strarray))
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81 error ("validatestring: strarray must be a cellstr");
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82 elseif (! ischar (funcname))
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83 error ("validatestring: funcname must be a character string");
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84 elseif (! isempty (funcname) && (rows (funcname) != 1))
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85 error ("validatestring: funcname must be exactly one row");
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86 elseif (! ischar (varname))
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87 error ("validatestring: varname must be a character string");
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88 elseif (! isempty (varname) && (rows (varname) != 1))
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89 error ("validatestring: varname must be exactly one row");
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90 elseif (position < 0)
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91 error ("validatestring: position must be >= 0");
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92 endif
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93
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94 ## make the part of the error that will use funcname, varname, and
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95 ## position
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96 errstr = "";
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97 if (! isempty (funcname))
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98 errstr = sprintf ("Function: %s ", funcname);
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99 endif
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100 if (! isempty (varname))
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101 errstr = sprintf ("%sVariable: %s ", errstr, varname);
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102 endif
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103 if (position > 0)
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104 errstr = sprintf ("%sArgument position %d ", errstr, position);
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105 endif
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106 if (! isempty (errstr))
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107 errstr(end:end+1) = ":\n";
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108 endif
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109
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110 matches = strncmpi (str, strarray(:), numel (str));
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111 nmatches = sum (matches);
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112 if (nmatches == 1)
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113 str = strarray{matches};
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114 elseif (nmatches == 0)
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115 error ("validatestring: %s%s does not match any of\n%s", errstr, str,
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116 sprintf ("%s, ", strarray{:})(1:end-1));
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117 else
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118 ## are the matches a substring of each other, if so, choose the
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119 ## shortest. If not, raise an error.
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120 match_idx = find (matches);
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121 match_l = cellfun (@length, strarray(match_idx));
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122 longest_idx = find (match_l == max (match_l), 1);
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123 shortest_idx = find (match_l == min (match_l), 1);
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124 longest = strarray(match_idx)(longest_idx);
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125 for i = 1:numel(match_idx)
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126 currentmatch = strarray(match_idx(i));
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127 if (! strncmpi (longest, currentmatch, length(currentmatch)))
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128 error ("validatestring: %smultiple unique matches were found for %s:\n%s",
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129 errstr, sprintf ("%s, ", strarray(match_idx))(1:end-2));
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130 endif
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131 endfor
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132 str = strarray{shortest_idx};
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133 endif
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134
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135 endfunction
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136
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137 ## Tests
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138 %!shared strarray
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139 %! strarray = {"octave" "Oct" "octopus" "octaves"};
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140 %!assert (validatestring ("octave", strarray), "octave")
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141 %!assert (validatestring ("oct", strarray), "Oct")
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142 %!assert (validatestring ("octave", strarray), "octave")
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143 %!assert (validatestring ("octav", strarray), "octave")