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1 ## Copyright (C) 2000 Paul Kienzle |
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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 2, or (at your option) |
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8 ## 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, write to the Free |
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} strjust (@var{s}, ["left"|"right"|"center"]) |
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22 ## Shift the non-blank text of @var{s} to the left, right or center of |
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23 ## the string. If @var{s} is a string array, justify each string in the |
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24 ## array. Null characters are replaced by blanks. If no justification |
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25 ## is specified, then all rows are right-justified. |
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26 ## @end deftypefn |
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27 |
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28 function x = strjust (x, just) |
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29 |
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30 if (nargin < 1 || nargin > 2) |
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31 usage ("strjust (s, ['left'|'right'|'center'])"); |
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32 endif |
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33 |
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34 if (nargin == 1) |
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35 just = "right"; |
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36 endif |
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37 |
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38 just = tolower (just); |
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39 |
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40 wfi = warn_fortran_indexing; |
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41 unwind_protect |
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42 warn_fortran_indexing = 0; |
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43 |
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44 ## convert nulls to blanks |
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45 idx = find (toascii (x) == 0); |
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46 if (! isempty (idx)) |
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47 x(idx) = " "; |
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48 endif |
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49 |
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50 ## For all cases, left, right and center, the algorithm is the same. |
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51 ## Find the number of blanks at the left/right end to determine the |
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52 ## shift, rotate the row index by using mod with that shift, then |
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53 ## translate the shifted row index into an array index. |
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54 [nr, nc] = size (x); |
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55 idx = (x' != " "); |
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56 if (strcmp (just, "right")) |
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57 [N, hi] = max (cumsum (idx)); |
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58 shift = hi; |
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59 elseif (strcmp (just, "left")) |
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60 [N, lo] = max (cumsum (flipud (idx))); |
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61 shift = (nc - lo); |
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62 else |
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63 [N, hi] = max (cumsum (idx)); |
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64 [N, lo] = max (cumsum (flipud (idx))); |
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65 shift = ceil (nc - (lo-hi)/2); |
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66 endif |
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67 idx = rem (ones(nr,1)*[0:nc-1] + shift'*ones(1,nc), nc); |
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68 x = x (idx*nr + [1:nr]'*ones(1,nc)); |
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69 |
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70 unwind_protect_cleanup |
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71 warn_fortran_indexing = wfi; |
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72 end_unwind_protect |
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73 |
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74 endfunction |
