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revision 236 by ph10, Tue Sep 11 12:57:06 2007 UTC revision 331 by ph10, Sat Apr 5 15:38:53 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.
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.
37    7.  Added some missing "const"s to declarations of static tables in
38        pcre_compile.c and pcre_dfa_exec.c.
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.)
44    9.  Applied Craig's patch to remove the use of push_back().
47    Version 7.6 28-Jan-08
48    ---------------------
50    1.  A character class containing a very large number of characters with
51        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
52        overflow.
54    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
55        HAVE_LONG_LONG is not defined.
57    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
58        bring them up to date and include new features. This patch includes:
60        - Fixed PH's badly added libz and libbz2 support.
61        - Fixed a problem with static linking.
62        - Added pcredemo. [But later removed - see 7 below.]
63        - Fixed dftables problem and added an option.
64        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
65            HAVE_LONG_LONG.
66        - Added readline support for pcretest.
67        - Added an listing of the option settings after cmake has run.
69    4.  A user submitted a patch to Makefile that makes it easy to create
70        "pcre.dll" under mingw when using Configure/Make. I added stuff to
71        Makefile.am that cause it to include this special target, without
72        affecting anything else. Note that the same mingw target plus all
73        the other distribution libraries and programs are now supported
74        when configuring with CMake (see 6 below) instead of with
75        Configure/Make.
77    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
78        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
79        exported in the Windows port". It has not yet been confirmed that the patch
80        solves the problem, but it does no harm.
82    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
83        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
84        with CMake, and also correct the comment about stack recursion.
86    7.  Remove the automatic building of pcredemo from the ./configure system and
87        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
88        of a program that users should build themselves after PCRE is installed, so
89        building it automatically is not really right. What is more, it gave
90        trouble in some build environments.
92    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
95    Version 7.5 10-Jan-08
96    ---------------------
98    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
99        values in parens when parsing an RE using the C++ wrapper."
101    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
102        Characters greater than 255 were excluded from the class instead of being
103        included.
105    3.  The same bug as (2) above applied to negated POSIX classes such as
106        [:^space:].
108    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
109        defined or documented. It seems to have been a typo for PCRE_STATIC, so
110        I have changed it.
112    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
113        first named subpattern) and a construct such as (?&a) would reference the
114        first named subpattern whose name started with "a" (in other words, the
115        length check was missing). Both these problems are fixed. "Subpattern name
116        expected" is now given for (?&) (a zero-length name), and this patch also
117        makes it give the same error for \k'' (previously it complained that that
118        was a reference to a non-existent subpattern).
120    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
121        this is right because (?- can be followed by option settings as well as by
122        digits. I have, however, made the messages clearer.
124    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
125        than the number used in the conditional) now cause a compile-time error.
126        This is actually not compatible with Perl, which accepts such patterns, but
127        treats the conditional as always being FALSE (as PCRE used to), but it
128        seems to me that giving a diagnostic is better.
130    8.  Change "alphameric" to the more common word "alphanumeric" in comments
131        and messages.
133    9.  Fix two occurrences of "backslash" in comments that should have been
134        "backspace".
136    10. Remove two redundant lines of code that can never be obeyed (their function
137        was moved elsewhere).
139    11. The program that makes PCRE's Unicode character property table had a bug
140        which caused it to generate incorrect table entries for sequences of
141        characters that have the same character type, but are in different scripts.
142        It amalgamated them into a single range, with the script of the first of
143        them. In other words, some characters were in the wrong script. There were
144        thirteen such cases, affecting characters in the following ranges:
146          U+002b0 - U+002c1
147          U+0060c - U+0060d
148          U+0061e - U+00612
149          U+0064b - U+0065e
150          U+0074d - U+0076d
151          U+01800 - U+01805
152          U+01d00 - U+01d77
153          U+01d9b - U+01dbf
154          U+0200b - U+0200f
155          U+030fc - U+030fe
156          U+03260 - U+0327f
157          U+0fb46 - U+0fbb1
158          U+10450 - U+1049d
160    12. The -o option (show only the matching part of a line) for pcregrep was not
161        compatible with GNU grep in that, if there was more than one match in a
162        line, it showed only the first of them. It now behaves in the same way as
163        GNU grep.
165    13. If the -o and -v options were combined for pcregrep, it printed a blank
166        line for every non-matching line. GNU grep prints nothing, and pcregrep now
167        does the same. The return code can be used to tell if there were any
168        non-matching lines.
170    14. Added --file-offsets and --line-offsets to pcregrep.
172    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
173        infinitely looping recursion. The bug was that positive lookaheads were not
174        being skipped when checking for a possible empty match (negative lookaheads
175        and both kinds of lookbehind were skipped).
177    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
178        inclusion of <windows.h> to before rather than after the definition of
179        INVALID_FILE_ATTRIBUTES (patch from David Byron).
181    17. Specifying a possessive quantifier with a specific limit for a Unicode
182        character property caused pcre_compile() to compile bad code, which led at
183        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
184        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
185        caused the error; without that there was no problem.
187    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
189    19. Added --enable-pcretest-libreadline.
191    20. In pcrecpp.cc, the variable 'count' was incremented twice in
192        RE::GlobalReplace(). As a result, the number of replacements returned was
193        double what it should be. I removed one of the increments, but Craig sent a
194        later patch that removed the other one (the right fix) and added unit tests
195        that check the return values (which was not done before).
197    21. Several CMake things:
199        (1) Arranged that, when cmake is used on Unix, the libraries end up with
200            the names libpcre and libpcreposix, not just pcre and pcreposix.
202        (2) The above change means that pcretest and pcregrep are now correctly
203            linked with the newly-built libraries, not previously installed ones.
207    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
208        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
209        UTF-8 newline character). The key issue is that the pattern starts .*;
210        this means that the match must be either at the beginning, or after a
211        newline. The bug was in the code for advancing after a failed match and
212        checking that the new position followed a newline. It was not taking
213        account of UTF-8 characters correctly.
215    23. PCRE was behaving differently from Perl in the way it recognized POSIX
216        character classes. PCRE was not treating the sequence [:...:] as a
217        character class unless the ... were all letters. Perl, however, seems to
218        allow any characters between [: and :], though of course it rejects as
219        unknown any "names" that contain non-letters, because all the known class
220        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
221        for example, whereas PCRE did not - it did not recognize a POSIX character
222        class. This seemed a bit dangerous, so the code has been changed to be
223        closer to Perl. The behaviour is not identical to Perl, because PCRE will
224        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
225        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
226        Perl does, and where it didn't before.
228    24. Rewrite so as to remove the single use of %n from pcregrep because in some
229        Windows environments %n is disabled by default.
232    Version 7.4 21-Sep-07
233  ---------------------  ---------------------
235  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 253  Version 7.4 10-Sep-07
254  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
255      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.  
257  6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward  5.  doc/pcresyntax.html was missing from the distribution.
259    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
260      compatibility, even though it is no longer used.      compatibility, even though it is no longer used.
262  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
263      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
264      different names are used).      windows.h file is present (where different names are used). [This was
265        reversed later after testing - see 16 below.]
266  8.  Changed all #include <config.h> to #include "config.h". There were also  
267    8.  Changed all #include <config.h> to #include "config.h". There were also
268      some further <pcre.h> cases that I changed to "pcre.h".      some further <pcre.h> cases that I changed to "pcre.h".
270    9.  When pcregrep was used with the --colour option, it missed the line ending
271        sequence off the lines that it output.
273    10. It was pointed out to me that arrays of string pointers cause lots of
274        relocations when a shared library is dynamically loaded. A technique of
275        using a single long string with a table of offsets can drastically reduce
276        these. I have refactored PCRE in four places to do this. The result is
277        dramatic:
279          Originally:                          290
280          After changing UCP table:            187
281          After changing error message table:   43
282          After changing table of "verbs"       36
283          After changing table of Posix names   22
285        Thanks to the folks working on Gregex for glib for this insight.
287    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
288        unicode-properties was also set.
290    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
292    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
293        checked only for CRLF.
295    14. Added casts to pcretest.c to avoid compiler warnings.
297    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
299    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
300        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
301        entirely. This removes changes made in 7 above.
303    17. The CMake files have been updated, and there is now more information about
304        building with CMake in the NON-UNIX-USE document.
307  Version 7.3 28-Aug-07  Version 7.3 28-Aug-07
308  ---------------------  ---------------------

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