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revision 372 by ph10, Tue Aug 26 11:49:38 2008 UTC revision 454 by ph10, Tue Sep 22 09:42:11 2009 UTC
# Line 36  MultiStage2.py   A Python script that ge Line 36  MultiStage2.py   A Python script that ge
36                   The generated file contains the tables for a 2-stage lookup                   The generated file contains the tables for a 2-stage lookup
37                   of Unicode properties.                   of Unicode properties.
38    
39    README           This file.
40    
41  Unicode.tables   The files in this directory, DerivedGeneralCategory.txt,  Unicode.tables   The files in this directory, DerivedGeneralCategory.txt,
42                   Scripts.txt and UnicodeData.txt, were downloaded from the                   Scripts.txt and UnicodeData.txt, were downloaded from the
43                   Unicode web site. They contain information about Unicode                   Unicode web site. They contain information about Unicode
# Line 62  Updating to a new Unicode release Line 64  Updating to a new Unicode release
64  ---------------------------------  ---------------------------------
65    
66  When there is a new release of Unicode, the files in Unicode.tables must be  When there is a new release of Unicode, the files in Unicode.tables must be
67  refreshed from the web site. If the new version of Unicode adds new character  refreshed from the web site. If the new version of Unicode adds new character
68  scripts, the source file ucp.h and both the MultiStage2.py and the  scripts, the source file ucp.h and both the MultiStage2.py and the
69  GenerateUtt.py scripts must be edited to add the new names. Then the  GenerateUtt.py scripts must be edited to add the new names. Then MultiStage2.py
70  MultiStage2.py script can then be run to generate a new version of pcre_ucd.c  can be run to generate a new version of pcre_ucd.c, and GenerateUtt.py can be
71  and the GenerateUtt.py can be run to generate the tricky tables for inclusion  run to generate the tricky tables for inclusion in pcre_tables.c.
72  in pcre_tables.c.  
73    The ucptest program can be compiled and used to check that the new tables in
74  The ucptest program can then be compiled and used to check that the new tables  pcre_ucd.c work properly, using the data files in ucptestdata to check a number
75  in pcre_ucd.c work properly, using the data files in ucptestdata to check a  of test characters.
 number of test characters.  
76    
77    
78  Preparing for a PCRE release  Preparing for a PCRE release
# Line 80  Preparing for a PCRE release Line 81  Preparing for a PCRE release
81  This section contains a checklist of things that I consult before building a  This section contains a checklist of things that I consult before building a
82  distribution for a new release.  distribution for a new release.
83    
84  . Ensure that the version number and version date are correct in configure.ac,  . Ensure that the version number and version date are correct in configure.ac.
   ChangeLog, and NEWS.  
85    
86  . If new build options have been added, ensure that they are added to the CMake  . If new build options have been added, ensure that they are added to the CMake
87    files as well as to the autoconf files.    files as well as to the autoconf files.
# Line 91  distribution for a new release. Line 91  distribution for a new release.
91  . Compile and test with many different config options, and combinations of  . Compile and test with many different config options, and combinations of
92    options. The maint/ManyConfigTests script now encapsulates this testing.    options. The maint/ManyConfigTests script now encapsulates this testing.
93    
94  . Run perltest.pl on the test data for tests 1 and 4. The output should match  . Run perltest.pl on the test data for tests 1, 4, 6, and 11. The first two can
95    the PCRE test output, apart from the version identification at the top. The    be run with Perl 5.8 or 5.10; the last two require Perl 5.10. The output
96    other tests are not Perl-compatible (they use various special PCRE options).    should match the PCRE test output, apart from the version identification at
97      the start of each test. The other tests are not Perl-compatible (they use
98      various PCRE-specific features or options).
99    
100  . Test with valgrind by running "RunTest valgrind". There is also "RunGrepTest  . Test with valgrind by running "RunTest valgrind". There is also "RunGrepTest
101    valgrind", though that takes quite a long time.    valgrind", though that takes quite a long time.
# Line 116  distribution for a new release. Line 118  distribution for a new release.
118    used" warnings for the modules in which there is no call to memmove(). These    used" warnings for the modules in which there is no call to memmove(). These
119    can be ignored.    can be ignored.
120    
121  . Documentation: check AUTHORS, COPYING, ChangeLog (check date), INSTALL,  . Documentation: check AUTHORS, COPYING, ChangeLog (check version and date),
122    LICENCE, NEWS (check date), NON-UNIX-USE, and README. Many of these won't    INSTALL, LICENCE, NEWS (check version and date), NON-UNIX-USE, and README.
123    need changing, but over the long term things do change.    Many of these won't need changing, but over the long term things do change.
124    
125  . Man pages: Check all man pages for \ not followed by e or f or " because  . Man pages: Check all man pages for \ not followed by e or f or " because
126    that indicates a markup error.    that indicates a markup error.
# Line 138  spaces). Then run "make distcheck" to cr Line 140  spaces). Then run "make distcheck" to cr
140  Double-check with "svn status", then create an SVN tagged copy:  Double-check with "svn status", then create an SVN tagged copy:
141    
142    svn copy svn://vcs.exim.org/pcre/code/trunk \    svn copy svn://vcs.exim.org/pcre/code/trunk \
143             svn://vcs.exim.org/pcre/code/tags/pcre-7.x             svn://vcs.exim.org/pcre/code/tags/pcre-8.xx
144    
145  Don't forget to update Freshmeat when the new release is out, and to tell  Don't forget to update Freshmeat when the new release is out, and to tell
146  webmaster@pcre.org and the mailing list.  webmaster@pcre.org and the mailing list.
# Line 166  others are relatively new. Line 168  others are relatively new.
168      to have little effect, and maybe makes things worse.      to have little effect, and maybe makes things worse.
169    
170    * "Ends with literal string" - note that a single character doesn't gain much    * "Ends with literal string" - note that a single character doesn't gain much
171      over the existing "required byte" (reqbyte) feature that just saves one      over the existing "required byte" (reqbyte) feature that just remembers one
172      byte.      byte.
173    
174    * These probably need to go in study():    * These probably need to go in study():
# Line 176  others are relatively new. Line 178  others are relatively new.
178      o A required byte from alternatives - not just the last char, but an      o A required byte from alternatives - not just the last char, but an
179        earlier one if common to all alternatives.        earlier one if common to all alternatives.
180    
181      o Minimum length of subject needed.      o Minimum length of subject needed (see also next . bullet).
182    
183      o Friedl contains other ideas.      o Friedl contains other ideas.
184    
185    . There was a request for a way of finding the minimum subject length that can
186      match a given pattern. (If this were available, it could be usefully added
187      to study() - see above.) This is easy for simple cases, but I haven't figured
188      out how to handle recursion.
189    
190  . If Perl gets to a consistent state over the settings of capturing sub-  . If Perl gets to a consistent state over the settings of capturing sub-
191    patterns inside repeats, see if we can match it. One example of the    patterns inside repeats, see if we can match it. One example of the
# Line 213  others are relatively new. Line 220  others are relatively new.
220    
221    * Option to use NUL as a line terminator in subject strings. This could now    * Option to use NUL as a line terminator in subject strings. This could now
222      be done relatively easily since the extension to support LF, CR, and CRLF.      be done relatively easily since the extension to support LF, CR, and CRLF.
223      If this is done, a suitable option for pcregrep is also required.      If it is done, a suitable option for pcregrep is also required.
224    
225  . Option to provide the pattern with a length instead of with a NUL terminator.  . Option to provide the pattern with a length instead of with a NUL terminator.
226    This probably affects quite a few places in the code.    This affects quite a few places in the code and is not trivial.
227    
228  . Catch SIGSEGV for stack overflows?  . Catch SIGSEGV for stack overflows?
229    
# Line 231  others are relatively new. Line 238  others are relatively new.
238    preceded by a blank line, instead of adding it to every matched line, and (b)    preceded by a blank line, instead of adding it to every matched line, and (b)
239    support --outputfile=name.    support --outputfile=name.
240    
241  . Consider making UTF-8 and UCP the default for PCRE n.0 for some n > 7.  . Consider making UTF-8 and UCP the default for PCRE n.0 for some n > 8.
242    
243  . Add a user pointer to pcre_malloc/free functions -- some option would be  . Add a user pointer to pcre_malloc/free functions -- some option would be
244    needed to retain backward compatibility.    needed to retain backward compatibility.
# Line 268  others are relatively new. Line 275  others are relatively new.
275  . Callouts with arguments: (?Cn:ARG) for instance.  . Callouts with arguments: (?Cn:ARG) for instance.
276    
277  . A user is going to supply a patch to generalize the API for user-specific  . A user is going to supply a patch to generalize the API for user-specific
278    memory allocation so that it is more flexible in threaded environments.    memory allocation so that it is more flexible in threaded environments. Thiw
279      was promised a long time ago, and never appeared...
280    
281    . Write a function that generates random matching strings for a compiled regex.
282    
283    . Write a wrapper to maintain a structure with specified runtime parameters,
284      such as recurse limit, and pass these to PCRE each time it is called. Also
285      maybe malloc and free. A user sent a prototype.
286    
287    . Pcregrep: an option to specify the output line separator, either as a string
288      or select from a fixed list. This is not dead easy, because at the moment it
289      outputs whatever is in the input file.
290    
291    . Improve the code for duplicate checking in pcre_dfa_exec(). An incomplete,
292      non-thread-safe patch showed that this can help performance for patterns
293      where there are many alternatives. However, a simple thread-safe
294      implementation that I tried made things worse in many simple cases, so this
295      is not an obviously good thing.
296    
297    . Make the longest lookbehind available via pcre_fullinfo(). This is not
298      straightforward because lookbehinds can be nested inside lookbehinds. This
299      case will have to be identified, and the amounts added. This should then give
300      the maximum possible lookbehind length. The reason for wanting this is to
301      help when implementing multi-segment matching using pcre_exec() with partial
302      matching and overlapping segments.
303    
304    . PCRE cannot at present distinguish between subpatterns with different names,
305      but the same number (created by the use of ?|). In order to do so, a way of
306      remembering *which* subpattern numbered n matched is needed. Bugzilla #760.
307    
308  Philip Hazel  Philip Hazel
309  Email local part: ph10  Email local part: ph10
310  Email domain: cam.ac.uk  Email domain: cam.ac.uk
311  Last updated: 26 August 2008  Last updated: 20 September 2009

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