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annotate scripts/strings/regexptranslate.m @ 7983:91d020444da7

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Document regexptranslate
author David Bateman <dbateman@free.fr>
date Sun, 27 Jul 2008 02:42:57 +0200
parents cc31c5002c96
children 502e58a0d44f
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1 ## Copyright (C) 2008 David Bateman
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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} {} regexptranslate (@var{op}, @var{s})
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21 ## Translate a string for use in a regular expression. This might
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22 ## include either wildcard replacement or special character escaping.
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23 ## The behavior can be controlled by the @var{op} that can have the
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24 ## values
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25 ##
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26 ## @table @asis
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27 ## @item "wildcard"
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28 ## The wildcard characters @code{.}, @code{*} and @code{?} are replaced
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29 ## with wildcards that are appropriate for a regular expression.
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30 ##
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31 ## @item "escape"
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32 ## The characters @code{$.?[]}, that have special meaning for regular
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33 ## expressions are escaped so that they are treated literally.
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34 ## @end table
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35 ## @end deftypefn
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36
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37 function y = regexptranslate (op, x)
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38
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39 if (ischar (op))
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40 op = tolower (op);
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41 if (strcmp ("wildcard", op))
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42 y = regexprep (regexprep (regexprep (x, "\\.", "\\."), "\\*",
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43 ".*"), "\\?", ".");
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44 elseif (strcmp ("escape", op))
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45 ch = {'\$', '\.', '\?', '\[', '\]'};
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46 y = x;
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47 for i = 1 : length (ch)
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48 y = regexprep (y, ch{i}, ch{i});
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49 endfor
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50 else
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51 error ("regexptranslate: unexpected operation");
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52 endif
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53 else
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54 error ("regexptranslate: expecting operation to be a string");
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55 endif
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56 endfunction
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57
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58 %!assert (regexptranslate ("wildcard", "/a*b?c."), "/a.*b.c\\.")
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59 %!assert (regexptranslate ("escape", '$.?[]'), '\$\.\?\[\]')