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revision 245 by ph10, Fri Sep 14 10:06:05 2007 UTC revision 335 by ph10, Sat Apr 12 14:36:14 2008 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.4 10-Sep-07  Version 7.7 05-Mar-08
5    ---------------------
6    
7    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
8        a string to a long long, pretend we don't even have a long long." This is
9        done by checking for the strtoq, strtoll, and _strtoi64 functions.
10    
11    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
12        pre-7.6 versions, which defined a global no_arg variable instead of putting
13        it in the RE class. (See also #8 below.)
14    
15    3.  Remove a line of dead code, identified by coverity and reported by Nuno
16        Lopes.
17    
18    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
19    
20        (1) The include/exclude patterns were being applied to the whole pathnames
21            of files, instead of just to the final components.
22    
23        (2) If there was more than one level of directory, the subdirectories were
24            skipped unless they satisfied the include/exclude conditions. This is
25            inconsistent with GNU grep (and could even be seen as contrary to the
26            pcregrep specification - which I improved to make it absolutely clear).
27            The action now is always to scan all levels of directory, and just
28            apply the include/exclude patterns to regular files.
29    
30    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
31        --exclude_dir in the tests to avoid scanning .svn directories.
32    
33    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
34        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
35        doesn't support NULs in patterns.
36    
37    7.  Added some missing "const"s to declarations of static tables in
38        pcre_compile.c and pcre_dfa_exec.c.
39    
40    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
41        caused by fix #2  above. (Subsequently also a second patch to fix the
42        first patch. And a third patch - this was a messy problem.)
43    
44    9.  Applied Craig's patch to remove the use of push_back().
45    
46    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
47        matching function regexec().
48    
49    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
50        which, however, unlike Perl's \g{...}, are subroutine calls, not back
51        references. PCRE supports relative numbers with this syntax (I don't think
52        Oniguruma does).
53    
54    12. Previously, a group with a zero repeat such as (...){0} was completely
55        omitted from the compiled regex. However, this means that if the group
56        was called as a subroutine from elsewhere in the pattern, things went wrong
57        (an internal error was given). Such groups are now left in the compiled
58        pattern, with a new opcode that causes them to be skipped at execution
59        time.
60    
61    
62    Version 7.6 28-Jan-08
63    ---------------------
64    
65    1.  A character class containing a very large number of characters with
66        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
67        overflow.
68    
69    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
70        HAVE_LONG_LONG is not defined.
71    
72    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
73        bring them up to date and include new features. This patch includes:
74    
75        - Fixed PH's badly added libz and libbz2 support.
76        - Fixed a problem with static linking.
77        - Added pcredemo. [But later removed - see 7 below.]
78        - Fixed dftables problem and added an option.
79        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
80            HAVE_LONG_LONG.
81        - Added readline support for pcretest.
82        - Added an listing of the option settings after cmake has run.
83    
84    4.  A user submitted a patch to Makefile that makes it easy to create
85        "pcre.dll" under mingw when using Configure/Make. I added stuff to
86        Makefile.am that cause it to include this special target, without
87        affecting anything else. Note that the same mingw target plus all
88        the other distribution libraries and programs are now supported
89        when configuring with CMake (see 6 below) instead of with
90        Configure/Make.
91    
92    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
93        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
94        exported in the Windows port". It has not yet been confirmed that the patch
95        solves the problem, but it does no harm.
96    
97    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
98        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
99        with CMake, and also correct the comment about stack recursion.
100    
101    7.  Remove the automatic building of pcredemo from the ./configure system and
102        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
103        of a program that users should build themselves after PCRE is installed, so
104        building it automatically is not really right. What is more, it gave
105        trouble in some build environments.
106    
107    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
108    
109    
110    Version 7.5 10-Jan-08
111    ---------------------
112    
113    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
114        values in parens when parsing an RE using the C++ wrapper."
115    
116    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
117        Characters greater than 255 were excluded from the class instead of being
118        included.
119    
120    3.  The same bug as (2) above applied to negated POSIX classes such as
121        [:^space:].
122    
123    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
124        defined or documented. It seems to have been a typo for PCRE_STATIC, so
125        I have changed it.
126    
127    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
128        first named subpattern) and a construct such as (?&a) would reference the
129        first named subpattern whose name started with "a" (in other words, the
130        length check was missing). Both these problems are fixed. "Subpattern name
131        expected" is now given for (?&) (a zero-length name), and this patch also
132        makes it give the same error for \k'' (previously it complained that that
133        was a reference to a non-existent subpattern).
134    
135    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
136        this is right because (?- can be followed by option settings as well as by
137        digits. I have, however, made the messages clearer.
138    
139    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
140        than the number used in the conditional) now cause a compile-time error.
141        This is actually not compatible with Perl, which accepts such patterns, but
142        treats the conditional as always being FALSE (as PCRE used to), but it
143        seems to me that giving a diagnostic is better.
144    
145    8.  Change "alphameric" to the more common word "alphanumeric" in comments
146        and messages.
147    
148    9.  Fix two occurrences of "backslash" in comments that should have been
149        "backspace".
150    
151    10. Remove two redundant lines of code that can never be obeyed (their function
152        was moved elsewhere).
153    
154    11. The program that makes PCRE's Unicode character property table had a bug
155        which caused it to generate incorrect table entries for sequences of
156        characters that have the same character type, but are in different scripts.
157        It amalgamated them into a single range, with the script of the first of
158        them. In other words, some characters were in the wrong script. There were
159        thirteen such cases, affecting characters in the following ranges:
160    
161          U+002b0 - U+002c1
162          U+0060c - U+0060d
163          U+0061e - U+00612
164          U+0064b - U+0065e
165          U+0074d - U+0076d
166          U+01800 - U+01805
167          U+01d00 - U+01d77
168          U+01d9b - U+01dbf
169          U+0200b - U+0200f
170          U+030fc - U+030fe
171          U+03260 - U+0327f
172          U+0fb46 - U+0fbb1
173          U+10450 - U+1049d
174    
175    12. The -o option (show only the matching part of a line) for pcregrep was not
176        compatible with GNU grep in that, if there was more than one match in a
177        line, it showed only the first of them. It now behaves in the same way as
178        GNU grep.
179    
180    13. If the -o and -v options were combined for pcregrep, it printed a blank
181        line for every non-matching line. GNU grep prints nothing, and pcregrep now
182        does the same. The return code can be used to tell if there were any
183        non-matching lines.
184    
185    14. Added --file-offsets and --line-offsets to pcregrep.
186    
187    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
188        infinitely looping recursion. The bug was that positive lookaheads were not
189        being skipped when checking for a possible empty match (negative lookaheads
190        and both kinds of lookbehind were skipped).
191    
192    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
193        inclusion of <windows.h> to before rather than after the definition of
194        INVALID_FILE_ATTRIBUTES (patch from David Byron).
195    
196    17. Specifying a possessive quantifier with a specific limit for a Unicode
197        character property caused pcre_compile() to compile bad code, which led at
198        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
199        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
200        caused the error; without that there was no problem.
201    
202    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
203    
204    19. Added --enable-pcretest-libreadline.
205    
206    20. In pcrecpp.cc, the variable 'count' was incremented twice in
207        RE::GlobalReplace(). As a result, the number of replacements returned was
208        double what it should be. I removed one of the increments, but Craig sent a
209        later patch that removed the other one (the right fix) and added unit tests
210        that check the return values (which was not done before).
211    
212    21. Several CMake things:
213    
214        (1) Arranged that, when cmake is used on Unix, the libraries end up with
215            the names libpcre and libpcreposix, not just pcre and pcreposix.
216    
217        (2) The above change means that pcretest and pcregrep are now correctly
218            linked with the newly-built libraries, not previously installed ones.
219    
220        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
221    
222    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
223        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
224        UTF-8 newline character). The key issue is that the pattern starts .*;
225        this means that the match must be either at the beginning, or after a
226        newline. The bug was in the code for advancing after a failed match and
227        checking that the new position followed a newline. It was not taking
228        account of UTF-8 characters correctly.
229    
230    23. PCRE was behaving differently from Perl in the way it recognized POSIX
231        character classes. PCRE was not treating the sequence [:...:] as a
232        character class unless the ... were all letters. Perl, however, seems to
233        allow any characters between [: and :], though of course it rejects as
234        unknown any "names" that contain non-letters, because all the known class
235        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
236        for example, whereas PCRE did not - it did not recognize a POSIX character
237        class. This seemed a bit dangerous, so the code has been changed to be
238        closer to Perl. The behaviour is not identical to Perl, because PCRE will
239        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
240        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
241        Perl does, and where it didn't before.
242    
243    24. Rewrite so as to remove the single use of %n from pcregrep because in some
244        Windows environments %n is disabled by default.
245    
246    
247    Version 7.4 21-Sep-07
248  ---------------------  ---------------------
249    
250  1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This  1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
# Line 32  Version 7.4 10-Sep-07 Line 275  Version 7.4 10-Sep-07
275      compatibility, even though it is no longer used.      compatibility, even though it is no longer used.
276    
277  7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and  7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
278      strtoull to pcrecpp.cc to select the available functions in WIN32 (where      strtoull to pcrecpp.cc to select the available functions in WIN32 when the
279      different names are used).      windows.h file is present (where different names are used). [This was
280        reversed later after testing - see 16 below.]
281    
282  8.  Changed all #include <config.h> to #include "config.h". There were also  8.  Changed all #include <config.h> to #include "config.h". There were also
283      some further <pcre.h> cases that I changed to "pcre.h".      some further <pcre.h> cases that I changed to "pcre.h".
# Line 54  Version 7.4 10-Sep-07 Line 298  Version 7.4 10-Sep-07
298        After changing table of Posix names   22        After changing table of Posix names   22
299    
300      Thanks to the folks working on Gregex for glib for this insight.      Thanks to the folks working on Gregex for glib for this insight.
301    
302  11. --disable-stack-for-recursion caused compiling to fail unless -enable-  11. --disable-stack-for-recursion caused compiling to fail unless -enable-
303      unicode-properties was also set.      unicode-properties was also set.
304    
305  12. Updated the RunTest script to miss out tests that don't work if \R is  12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
306      defaulted to ANYCRLF.  
307    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
308        checked only for CRLF.
309    
310    14. Added casts to pcretest.c to avoid compiler warnings.
311    
312    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
313    
314    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
315        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
316        entirely. This removes changes made in 7 above.
317    
318    17. The CMake files have been updated, and there is now more information about
319        building with CMake in the NON-UNIX-USE document.
320    
321    
322  Version 7.3 28-Aug-07  Version 7.3 28-Aug-07

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