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annotate scripts/strings/regexptranslate.m @ 12744:343eca0298d0 stable

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maint: fix version number for stable branch * configure.ac (AC_INIT): Correct stable branch version number.
author John W. Eaton <jwe@octave.org>
date Wed, 15 Jun 2011 09:39:23 -0400
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children 8a124aeb7ded
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1 ## Copyright (C) 2008-2011 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 ## For example:
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31 ##
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32 ## @example
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33 ## @group
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34 ## regexptranslate ("wildcard", "*.m")
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35 ## @result{} ".*\.m"
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36 ## @end group
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37 ## @end example
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38 ##
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39 ## @item "escape"
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40 ## The characters @code{$.?[]}, that have special meaning for regular
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41 ## expressions are escaped so that they are treated literally. For example:
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42 ##
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43 ## @example
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44 ## @group
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45 ## regexptranslate ("escape", "12.5")
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46 ## @result{} "12\.5"
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47 ## @end group
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48 ## @end example
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49 ##
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50 ## @end table
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51 ## @seealso{regexp, regexpi, regexprep}
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52 ## @end deftypefn
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53
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54 function y = regexptranslate (op, s)
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55
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56 if nargin != 2
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57 print_usage ();
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58 endif
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59
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60 if (ischar (op))
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61 op = tolower (op);
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62 if (strcmp ("wildcard", op))
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63 y = regexprep (regexprep (regexprep (s, '\.', '\.'), '\*',
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64 '.*'), '\?', '.');
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65 elseif (strcmp ("escape", op))
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66 ch = {'\$', '\.', '\?', '\[', '\]'};
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67 y = s;
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68 for i = 1 : length (ch)
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69 y = regexprep (y, ch{i}, ch{i});
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70 endfor
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71 else
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72 error ("regexptranslate: unexpected operation");
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73 endif
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74 else
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75 error ("regexptranslate: expecting operation to be a string");
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76 endif
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77 endfunction
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78
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79 %!error <Invalid call to regexptranslate> regexptranslate ();
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80 %!error <Invalid call to regexptranslate> regexptranslate ("wildcard");
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81 %!error <Invalid call to regexptranslate> regexptranslate ("a", "b", "c");
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82 %!error <unexpected operation> regexptranslate ("foo", "abc");
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83 %!error <expecting operation to be a string> regexptranslate (10, "abc");
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84 %!assert (regexptranslate ("wildcard", "/a*b?c."), "/a.*b.c\\.")
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85 %!assert (regexptranslate ("escape", '$.?[]'), '\$\.\?\[\]')