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revision 135 by ph10, Thu Mar 29 09:09:33 2007 UTC revision 197 by ph10, Tue Jul 31 10:50:18 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 12-Mar-07  Version 7.3 05-Jul-07
5    ---------------------
6    
7     1. In the rejigging of the build system that eventually resulted in 7.1, the
8        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
9        brackets there is not right, since it causes compilers to look for an
10        installed pcre.h, not the version that is in the source that is being
11        compiled (which of course may be different). I have changed it back to:
12    
13          #include "pcre.h"
14    
15        I have a vague recollection that the change was concerned with compiling in
16        different directories, but in the new build system, that is taken care of
17        by the VPATH setting the Makefile.
18    
19     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
20        when the subject happened to end in the byte 0x85 (e.g. if the last
21        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
22        characters but of course it shouldn't be taken as a newline when it is part
23        of another character. The bug was that, for an unlimited repeat of . in
24        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
25        characters when looking for a newline.
26    
27     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
28    
29     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
30        in debug output.
31    
32     5. Arrange to use "%I64d" instead of "%lld" for long printing in the pcrecpp
33        unittest when running under MinGW.
34    
35     6. ESC_K was left out of the EBCDIC table.
36    
37     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
38        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
39        limit also applies to "virtual nesting" when a pattern is recursive, and in
40        this case 1000 isn't so big. I have been able to remove this limit at the
41        expense of backing off one optimization in certain circumstances. Normally,
42        when pcre_exec() would call its internal match() function recursively and
43        immediately return the result unconditionally, it uses a "tail recursion"
44        feature to save stack. However, when a subpattern that can match an empty
45        string has an unlimited repetition quantifier, it no longer makes this
46        optimization. That gives it a stack frame in which to save the data for
47        checking that an empty string has been matched. Previously this was taken
48        from the 1000-entry workspace that had been reserved. So now there is no
49        explicit limit, but more stack is used.
50    
51    
52    Version 7.2 19-Jun-07
53    ---------------------
54    
55     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
56        which is apparently normally available under Windows.
57    
58     2. Re-jig the pcregrep tests with different newline settings in an attempt
59        to make them independent of the local environment's newline setting.
60    
61     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
62    
63     4. Some of the "internals" tests were previously cut out when the link size
64        was not 2, because the output contained actual offsets. The recent new
65        "Z" feature of pcretest means that these can be cut out, making the tests
66        usable with all link sizes.
67    
68     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
69        stack recursion. This gives a massive performance boost under BSD, but just
70        a small improvement under Linux. However, it saves one field in the frame
71        in all cases.
72    
73     6. Added more features from the forthcoming Perl 5.10:
74    
75        (a) (?-n) (where n is a string of digits) is a relative subroutine or
76            recursion call. It refers to the nth most recently opened parentheses.
77    
78        (b) (?+n) is also a relative subroutine call; it refers to the nth next
79            to be opened parentheses.
80    
81        (c) Conditions that refer to capturing parentheses can be specified
82            relatively, for example, (?(-2)... or (?(+3)...
83    
84        (d) \K resets the start of the current match so that everything before
85            is not part of it.
86    
87        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
88    
89        (f) \g{name} is another synonym - part of Perl 5.10's unification of
90            reference syntax.
91    
92        (g) (?| introduces a group in which the numbering of parentheses in each
93            alternative starts with the same number.
94    
95        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
96    
97     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
98        PCRE_INFO_JCHANGED.
99    
100     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
101        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
102        for detecting groups that can match an empty string.
103    
104     9. A pattern with a very large number of alternatives (more than several
105        hundred) was running out of internal workspace during the pre-compile
106        phase, where pcre_compile() figures out how much memory will be needed. A
107        bit of new cunning has reduced the workspace needed for groups with
108        alternatives. The 1000-alternative test pattern now uses 12 bytes of
109        workspace instead of running out of the 4096 that are available.
110    
111    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
112    
113    11. Applied patch from Google to remove an optimization that didn't quite work.
114        The report of the bug said:
115    
116          pcrecpp::RE("a*").FullMatch("aaa") matches, while
117          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
118          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
119    
120    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
121        it matched the wrong number of bytes.
122    
123    
124    Version 7.1 24-Apr-07
125  ---------------------  ---------------------
126    
127   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
# Line 127  Version 7.1 12-Mar-07 Line 247  Version 7.1 12-Mar-07
247      in an attempt to make files that differ only in their line terminators      in an attempt to make files that differ only in their line terminators
248      compare equal. This works on Linux.      compare equal. This works on Linux.
249    
250    17. Under certain error circumstances pcregrep might try to free random memory
251        as it exited. This is now fixed, thanks to valgrind.
252    
253    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
254        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
255        was because its rules for how to advance for /g after matching an empty
256        string at the end of a line did not allow for this case. They now check for
257        it specially.
258    
259    20. pcretest is supposed to handle patterns and data of any length, by
260        extending its buffers when necessary. It was getting this wrong when the
261        buffer for a data line had to be extended.
262    
263    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
264        CRLF as a newline sequence.
265    
266    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
267        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
268        I have nevertheless tidied it up.
269    
270    23. Added some casts to kill warnings from HP-UX ia64 compiler.
271    
272    24. Added a man page for pcre-config.
273    
274    
275  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
276  ---------------------  ---------------------

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