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revision 236 by ph10, Tue Sep 11 12:57:06 2007 UTC revision 325 by ph10, Sat Mar 8 17:13:02 2008 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.4 10-Sep-07  Version 7.7 05-Mar-08
5    ---------------------
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.
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.
15    3.  Remove a line of dead code, identified by coverity and reported by Nuno
16        Lopes.
18    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
20        (1) The include/exclude patterns were being applied to the whole pathnames
21            of files, instead of just to the final components.
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.
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.
34    Version 7.6 28-Jan-08
35    ---------------------
37    1.  A character class containing a very large number of characters with
38        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
39        overflow.
41    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
42        HAVE_LONG_LONG is not defined.
44    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
45        bring them up to date and include new features. This patch includes:
47        - Fixed PH's badly added libz and libbz2 support.
48        - Fixed a problem with static linking.
49        - Added pcredemo. [But later removed - see 7 below.]
50        - Fixed dftables problem and added an option.
51        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
52            HAVE_LONG_LONG.
53        - Added readline support for pcretest.
54        - Added an listing of the option settings after cmake has run.
56    4.  A user submitted a patch to Makefile that makes it easy to create
57        "pcre.dll" under mingw when using Configure/Make. I added stuff to
58        Makefile.am that cause it to include this special target, without
59        affecting anything else. Note that the same mingw target plus all
60        the other distribution libraries and programs are now supported
61        when configuring with CMake (see 6 below) instead of with
62        Configure/Make.
64    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
65        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
66        exported in the Windows port". It has not yet been confirmed that the patch
67        solves the problem, but it does no harm.
69    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
70        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
71        with CMake, and also correct the comment about stack recursion.
73    7.  Remove the automatic building of pcredemo from the ./configure system and
74        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
75        of a program that users should build themselves after PCRE is installed, so
76        building it automatically is not really right. What is more, it gave
77        trouble in some build environments.
79    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
82    Version 7.5 10-Jan-08
83    ---------------------
85    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
86        values in parens when parsing an RE using the C++ wrapper."
88    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
89        Characters greater than 255 were excluded from the class instead of being
90        included.
92    3.  The same bug as (2) above applied to negated POSIX classes such as
93        [:^space:].
95    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
96        defined or documented. It seems to have been a typo for PCRE_STATIC, so
97        I have changed it.
99    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
100        first named subpattern) and a construct such as (?&a) would reference the
101        first named subpattern whose name started with "a" (in other words, the
102        length check was missing). Both these problems are fixed. "Subpattern name
103        expected" is now given for (?&) (a zero-length name), and this patch also
104        makes it give the same error for \k'' (previously it complained that that
105        was a reference to a non-existent subpattern).
107    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
108        this is right because (?- can be followed by option settings as well as by
109        digits. I have, however, made the messages clearer.
111    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
112        than the number used in the conditional) now cause a compile-time error.
113        This is actually not compatible with Perl, which accepts such patterns, but
114        treats the conditional as always being FALSE (as PCRE used to), but it
115        seems to me that giving a diagnostic is better.
117    8.  Change "alphameric" to the more common word "alphanumeric" in comments
118        and messages.
120    9.  Fix two occurrences of "backslash" in comments that should have been
121        "backspace".
123    10. Remove two redundant lines of code that can never be obeyed (their function
124        was moved elsewhere).
126    11. The program that makes PCRE's Unicode character property table had a bug
127        which caused it to generate incorrect table entries for sequences of
128        characters that have the same character type, but are in different scripts.
129        It amalgamated them into a single range, with the script of the first of
130        them. In other words, some characters were in the wrong script. There were
131        thirteen such cases, affecting characters in the following ranges:
133          U+002b0 - U+002c1
134          U+0060c - U+0060d
135          U+0061e - U+00612
136          U+0064b - U+0065e
137          U+0074d - U+0076d
138          U+01800 - U+01805
139          U+01d00 - U+01d77
140          U+01d9b - U+01dbf
141          U+0200b - U+0200f
142          U+030fc - U+030fe
143          U+03260 - U+0327f
144          U+0fb46 - U+0fbb1
145          U+10450 - U+1049d
147    12. The -o option (show only the matching part of a line) for pcregrep was not
148        compatible with GNU grep in that, if there was more than one match in a
149        line, it showed only the first of them. It now behaves in the same way as
150        GNU grep.
152    13. If the -o and -v options were combined for pcregrep, it printed a blank
153        line for every non-matching line. GNU grep prints nothing, and pcregrep now
154        does the same. The return code can be used to tell if there were any
155        non-matching lines.
157    14. Added --file-offsets and --line-offsets to pcregrep.
159    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
160        infinitely looping recursion. The bug was that positive lookaheads were not
161        being skipped when checking for a possible empty match (negative lookaheads
162        and both kinds of lookbehind were skipped).
164    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
165        inclusion of <windows.h> to before rather than after the definition of
166        INVALID_FILE_ATTRIBUTES (patch from David Byron).
168    17. Specifying a possessive quantifier with a specific limit for a Unicode
169        character property caused pcre_compile() to compile bad code, which led at
170        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
171        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
172        caused the error; without that there was no problem.
174    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
176    19. Added --enable-pcretest-libreadline.
178    20. In pcrecpp.cc, the variable 'count' was incremented twice in
179        RE::GlobalReplace(). As a result, the number of replacements returned was
180        double what it should be. I removed one of the increments, but Craig sent a
181        later patch that removed the other one (the right fix) and added unit tests
182        that check the return values (which was not done before).
184    21. Several CMake things:
186        (1) Arranged that, when cmake is used on Unix, the libraries end up with
187            the names libpcre and libpcreposix, not just pcre and pcreposix.
189        (2) The above change means that pcretest and pcregrep are now correctly
190            linked with the newly-built libraries, not previously installed ones.
194    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
195        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
196        UTF-8 newline character). The key issue is that the pattern starts .*;
197        this means that the match must be either at the beginning, or after a
198        newline. The bug was in the code for advancing after a failed match and
199        checking that the new position followed a newline. It was not taking
200        account of UTF-8 characters correctly.
202    23. PCRE was behaving differently from Perl in the way it recognized POSIX
203        character classes. PCRE was not treating the sequence [:...:] as a
204        character class unless the ... were all letters. Perl, however, seems to
205        allow any characters between [: and :], though of course it rejects as
206        unknown any "names" that contain non-letters, because all the known class
207        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
208        for example, whereas PCRE did not - it did not recognize a POSIX character
209        class. This seemed a bit dangerous, so the code has been changed to be
210        closer to Perl. The behaviour is not identical to Perl, because PCRE will
211        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
212        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
213        Perl does, and where it didn't before.
215    24. Rewrite so as to remove the single use of %n from pcregrep because in some
216        Windows environments %n is disabled by default.
219    Version 7.4 21-Sep-07
220  ---------------------  ---------------------
222  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 25  Version 7.4 10-Sep-07 Line 240  Version 7.4 10-Sep-07
241  4.  Added options (at build time, compile time, exec time) to change \R from  4.  Added options (at build time, compile time, exec time) to change \R from
242      matching any Unicode line ending sequence to just matching CR, LF, or CRLF.      matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
 5.  doc/pcresyntax.html was missing from the distribution.  
244  6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward  5.  doc/pcresyntax.html was missing from the distribution.
246    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
247      compatibility, even though it is no longer used.      compatibility, even though it is no longer used.
249  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
250      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
251      different names are used).      windows.h file is present (where different names are used). [This was
252        reversed later after testing - see 16 below.]
253  8.  Changed all #include <config.h> to #include "config.h". There were also  
254    8.  Changed all #include <config.h> to #include "config.h". There were also
255      some further <pcre.h> cases that I changed to "pcre.h".      some further <pcre.h> cases that I changed to "pcre.h".
257    9.  When pcregrep was used with the --colour option, it missed the line ending
258        sequence off the lines that it output.
260    10. It was pointed out to me that arrays of string pointers cause lots of
261        relocations when a shared library is dynamically loaded. A technique of
262        using a single long string with a table of offsets can drastically reduce
263        these. I have refactored PCRE in four places to do this. The result is
264        dramatic:
266          Originally:                          290
267          After changing UCP table:            187
268          After changing error message table:   43
269          After changing table of "verbs"       36
270          After changing table of Posix names   22
272        Thanks to the folks working on Gregex for glib for this insight.
274    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
275        unicode-properties was also set.
277    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
279    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
280        checked only for CRLF.
282    14. Added casts to pcretest.c to avoid compiler warnings.
284    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
286    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
287        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
288        entirely. This removes changes made in 7 above.
290    17. The CMake files have been updated, and there is now more information about
291        building with CMake in the NON-UNIX-USE document.
294  Version 7.3 28-Aug-07  Version 7.3 28-Aug-07
295  ---------------------  ---------------------

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