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annotate scripts/strings/strsplit.m @ 8877:2c8b2399247b

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implement strsplit; deprecate split
author Jaroslav Hajek <highegg@gmail.com>
date Thu, 26 Feb 2009 10:29:59 +0100
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children 7de0992eb123
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8877
2c8b2399247b implement strsplit; deprecate split
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1 ## Copyright (C) 2009 Jaroslav Hajek
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2 ##
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3 ## This program is free software; you can redistribute it and/or modify it
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4 ## under the terms of the GNU General Public License as published by
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5 ## the Free Software Foundation; either version 3 of the License, or (at
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6 ## your option) any later version.
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7 ##
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8 ## This program is distributed in the hope that it will be useful, but
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9 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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11 ## General Public License for more details.
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12 ##
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13 ## You should have received a copy of the GNU General Public License
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14 ## along with this program; see the file COPYING. If not, see
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15 ## <http://www.gnu.org/licenses/>.
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16
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17 ## -*- texinfo -*-
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18 ## @deftypefn {Function File} {[@var{s}] =} strsplit (@var{p}, @var{sep}, @var{strip_empty})
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19 ## Splits a single string using one or more delimiters.
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20 ## The result is returned as a cell array of strings. Consecutive delimiters
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21 ## and delimiters at boundaries result in empty strings, unless @var{strip_empty} is true.
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22 ## The default value of @var{strip_empty} is false.
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23 ## @end deftypefn
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24
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25 function s = strsplit (p, sep, strip_empty = false)
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26 if (! ischar (p) || rows (p) > 1 || ! ischar (sep) || ! islogical (strip_empty))
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27 print_usage ();
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28 endif
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29
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30 if (isempty (p))
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31 s = cell (size (p));
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32 else
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33 ## split p according to delimiter.
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34 if (isscalar (sep))
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35 ## single separator
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36 idx = find (p == sep);
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37 else
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38 ## multiple separators
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39 idx = strchr (p, sep);
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40 endif
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41
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42 ## get substring sizes.
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43 if (isempty (idx))
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44 sizes = numel (p);
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45 else
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46 sizes = [idx(1)-1, diff(idx)-1, numel(p)-idx(end)];
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47 endif
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48 ## remove separators.
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49 p(idx) = [];
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50 if (strip_empty)
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51 ## omit zero lengths.
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52 sizes = sizes (sizes != 0);
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53 endif
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54 ## convert!
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55 s = mat2cell (p, 1, sizes);
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56 endif
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57 endfunction
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58
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59 %!assert (all (strcmp (strsplit ("road to hell", " "), {"road", "to", "hell"})))
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60
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61 %!assert (all (strcmp (strsplit ("road to^hell", " ^"), {"road", "to", "hell"})))
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62
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63 %!assert (all (strcmp (strsplit ("road to--hell", " -", true), {"road", "to", "hell"})))