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1 ## Copyright (C) 1996 Kurt Hornik |
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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} {} split (@var{s}, @var{t}, @var{n}) |
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21 ## Divides the string @var{s} into pieces separated by @var{t}, returning |
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22 ## the result in a string array (padded with blanks to form a valid |
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23 ## matrix). If the optional input @var{n} is supplied, split @var{s} |
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24 ## into at most @var{n} different pieces. |
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25 ## |
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26 ## For example, |
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27 ## |
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28 ## @example |
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29 ## split ("Test string", "t") |
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30 ## @result{} "Tes " |
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31 ## " s " |
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32 ## "ring" |
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33 ## @end example |
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34 ## |
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35 ## @example |
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36 ## split ("Test string", "t", 2) |
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37 ## @result{} "Tes " |
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38 ## " string" |
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39 ## @end example |
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40 ## @end deftypefn |
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41 |
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42 ## Author: Kurt Hornik <Kurt.Hornik@wu-wien.ac.at> |
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43 ## Adapted-By: jwe |
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44 |
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45 function m = split (s, t, n) |
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46 |
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47 if (nargin == 2 || nargin == 3) |
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48 if (nargin == 2) |
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49 n = length (s); |
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50 endif |
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51 |
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52 if (ischar (s) && ischar (t)) |
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53 |
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54 l_s = length (s); |
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55 l_t = length (t); |
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56 |
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57 if (l_s == 0) |
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58 m = ""; |
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59 return; |
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60 elseif (l_t == 0) |
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61 m = s'; |
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62 return; |
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63 elseif (l_s < l_t) |
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64 error ("split: s must not be shorter than t"); |
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65 endif |
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66 |
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67 if (min (size (s)) != 1 || min (size (t)) != 1) |
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68 error("split: multi-line strings are not supported"); |
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69 endif |
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70 |
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71 ind = findstr (s, t, 0); |
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72 if (length (ind) == 0) |
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73 m = s; |
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74 return; |
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75 elseif (n - 1 < length(ind)) |
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76 ind = ind(1:n-1); |
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77 endif |
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78 ind2 = [1, ind+l_t]; |
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79 ind = [ind, l_s+1]; |
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80 |
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81 ind_diff = ind-ind2; |
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82 |
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83 ## Create a matrix of the correct size that's filled with spaces. |
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84 m_rows = length (ind); |
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85 m_cols = max (ind_diff); |
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86 m = repmat (" ", m_rows, m_cols); |
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87 |
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88 ## Copy the strings to the matrix. |
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89 for i = 1:length (ind) |
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90 tmp = ind2(i):(ind(i)-1); |
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91 m(i,1:length(tmp)) = s(tmp); |
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92 endfor |
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93 else |
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94 error ("split: both s and t must be strings"); |
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95 endif |
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96 else |
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97 print_usage (); |
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98 endif |
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99 |
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100 endfunction |
