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annotate scripts/strings/strjust.m @ 20038:9fc020886ae9

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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 df437a52bcaf
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rev   line source
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1 ## Copyright (C) 2000-2015 Paul Kienzle
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2 ## Copyright (C) 2009 Jaroslav Hajek
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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} {} strjust (@var{s})
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22 ## @deftypefnx {Function File} {} strjust (@var{s}, @var{pos})
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23 ## Return the text, @var{s}, justified according to @var{pos}, which may
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24 ## be @qcode{"left"}, @qcode{"center"}, or @qcode{"right"}. If @var{pos}
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25 ## is omitted it defaults to @qcode{"right"}.
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26 ##
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27 ## Null characters are replaced by spaces. All other character
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28 ## data are treated as non-white space.
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29 ##
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30 ## Example:
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31 ##
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32 ## @example
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33 ## @group
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34 ## strjust (["a"; "ab"; "abc"; "abcd"])
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35 ## @result{}
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36 ## " a"
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37 ## " ab"
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38 ## " abc"
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39 ## "abcd"
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40 ## @end group
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41 ## @end example
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42 ## @seealso{deblank, strrep, strtrim, untabify}
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43 ## @end deftypefn
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44
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45 function y = strjust (s, pos = "right")
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46
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47 if (nargin < 1 || nargin > 2)
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48 print_usage ();
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49 elseif (! ischar (s) || ndims (s) > 2)
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50 error ("strjust: S must be a string or 2-D character matrix");
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51 endif
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52
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53 if (isempty (s))
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54 y = s;
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55 return;
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56 endif
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57
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58 ## Apparently, Matlab considers nulls to be blanks as well; however, does
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59 ## not preserve the nulls, but rather converts them to blanks. That's a
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60 ## bit unexpected, but it allows simpler processing, because we can move
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61 ## just the nonblank characters. So we'll do the same here.
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62
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63 [nr, nc] = size (s);
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64 ## Find the indices of all nonblanks.
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65 nonbl = s != " " & s != "\0";
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66 [idx, jdx] = find (nonbl);
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67
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68 if (strcmpi (pos, "right"))
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69 ## We wish to find the maximum column index for each row. Because jdx is
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70 ## sorted, we can take advantage of the fact that assignment is processed
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71 ## sequentially and for duplicate indices the last value will remain.
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72 maxs = repmat (nc, [nr, 1]);
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73 maxs(idx) = jdx;
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74 shift = nc - maxs;
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75 elseif (strcmpi (pos, "left"))
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76 ## See above for explanation.
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77 mins = ones (nr, 1);
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78 mins(flipud (idx(:))) = flipud (jdx(:));
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79 shift = 1 - mins;
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80 else
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81 ## Use both of the above to achieve centering.
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82 mins = ones (nr, 1);
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83 mins(flipud (idx(:))) = flipud (jdx(:));
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84 maxs = repmat (nc, [nr, 1]);
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85 maxs(idx) = jdx;
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86 shift = floor ((nc + 1 - maxs - mins) / 2);
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87 endif
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88
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89 ## Adjust the column indices.
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90 jdx += shift (idx);
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91
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92 ## Create a blank matrix and position the nonblank characters.
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93 y = repmat (" ", nr, nc);
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94 y(sub2ind ([nr, nc], idx, jdx)) = s(nonbl);
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95
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96 endfunction
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97
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98
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99 %!assert (strjust (["a"; "ab"; "abc"; "abcd"]),
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100 %! [" a";" ab"; " abc"; "abcd"])
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101 %!assert (strjust ([" a"; " ab"; "abc"; "abcd"], "left"),
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102 %! ["a "; "ab "; "abc "; "abcd"])
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103 %!assert (strjust (["a"; "ab"; "abc"; "abcd"], "CENTER"),
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104 %! [" a "; " ab"; "abc "; "abcd"])
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105 %!assert (strjust (["";""]), "")
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106
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107 ## Test input validation
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108 %!error <Invalid call to strjust> strjust ()
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109 %!error <Invalid call to strjust> strjust (["a";"ab"], "center", 1)
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110 %!error <S must be a string> strjust (ones (3,3))
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111 %!error <S must be a string> strjust (char (ones (3,3,3)))
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112