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Implement resource limits for regular expression evaluation. Tweaked

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to roughly match the Cocoa behaviour, but can be changed through 
the GSRegularExpressionWorkLimit user default.


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@39872 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
Niels Grewe 2016-06-17 09:04:04 +00:00
parent ac2d08d2a1
commit 0d98f56eca
4 changed files with 156 additions and 8 deletions
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24
Headers/Foundation/NSRegularExpression.h
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@ -1,18 +1,19 @@
/* Definition of class NSRegularExpression
Copyright (C) 2011 Free Software Foundation, Inc.
This file is part of the GNUstep Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
@ -72,7 +73,19 @@ DEFINE_BLOCK_TYPE(GSRegexBlock, void, NSTextCheckingResult*,
#ifndef GSREGEXTYPE
# define GSREGEXTYPE void
#endif
/**
* NSRegularExpression is used to inspect and manipulate strings using regular
* expressions. The interface is thread safe: The same NSRegularExpression
* object may be used to concurrently perform matching on multiple threads.
*
* To guard against regular expressions with extremely poor performance, the
* underlying matcher will abort after a certain number of steps. This is
* controlled using the GSRegularExpressionWorkLimit user default. The value of
* this default key represents the number of steps executed by the match engine,
* so it is only indirectly correlated with the time taken to execute the
* pattern, but it usually in the order of milliseconds. The preset 1500,
* setting value to 0 disables the work limit.
*/
@interface NSRegularExpression : NSObject <NSCoding, NSCopying>
{
#if GS_EXPOSE(NSRegularExpression)
@ -153,4 +166,3 @@ DEFINE_BLOCK_TYPE(GSRegexBlock, void, NSTextCheckingResult*,
#endif /* GS_API_MACOSX */
#endif /* _NSRegualrExpression_h_GNUSTEP_BASE_INCLUDE */