Mercurial > octave-antonio
view scripts/strings/regexptranslate.m @ 20166:196871335aa8
Allow call with empty argument list in strcat related functions (bug #44981)
* libinterp/corefcn/strfns.cc (strvcat): return an empty string for an empty
argument list. Simply dropping the input checking, will return an empty
string. This makes it more consistent with cat(), vertcat, and horzcat()
functions, which return [] for this cases. It makes it easier to support
"strcat (cell{:})" when cell is empty.
* scripts/strings/cstrcat.m, scripts/strings/strcat.m: same as above. But
because [cellstr{:}] when cellstr is empty returns double ([]), we
specifically return "".
author | Carnë Draug <carandraug@octave.org> |
---|---|
date | Fri, 01 May 2015 16:21:39 +0100 |
parents | 9fc020886ae9 |
children | df437a52bcaf |
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## Copyright (C) 2008-2015 David Bateman ## ## This file is part of Octave. ## ## Octave is free software; you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 3 of the License, or (at ## your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {} regexptranslate (@var{op}, @var{s}) ## Translate a string for use in a regular expression. This may ## include either wildcard replacement or special character escaping. ## The behavior is controlled by @var{op} which can take the following ## values ## ## @table @asis ## @item @qcode{"wildcard"} ## The wildcard characters @code{.}, @code{*}, and @code{?} are replaced ## with wildcards that are appropriate for a regular expression. ## For example: ## ## @example ## @group ## regexptranslate ("wildcard", "*.m") ## @result{} ".*\.m" ## @end group ## @end example ## ## @item @qcode{"escape"} ## The characters @code{$.?[]}, that have special meaning for regular ## expressions are escaped so that they are treated literally. For example: ## ## @example ## @group ## regexptranslate ("escape", "12.5") ## @result{} "12\.5" ## @end group ## @end example ## ## @end table ## @seealso{regexp, regexpi, regexprep} ## @end deftypefn function y = regexptranslate (op, s) if (nargin != 2) print_usage (); endif if (! ischar (op)) error ("regexptranslate: operation OP must be a string"); endif op = tolower (op); if (strcmp ("wildcard", op)) y = regexprep (regexprep (regexprep (s, '\.', '\.'), '\*', '.*'), '\?', '.'); elseif (strcmp ("escape", op)) y = regexprep (s, '([^\w])', '\\$1'); else error ("regexptranslate: invalid operation OP"); endif endfunction %!assert (regexptranslate ("wildcard", "/a*b?c."), "/a.*b.c\\.") %!assert (regexptranslate ("escape", '$.?[abc]'), '\$\.\?\[abc\]') ## Test input validation %!error <Invalid call to regexptranslate> regexptranslate () %!error <Invalid call to regexptranslate> regexptranslate ("wildcard") %!error <Invalid call to regexptranslate> regexptranslate ("a", "b", "c") %!error <invalid operation> regexptranslate ("foo", "abc") %!error <operation OP must be a string> regexptranslate (10, "abc")