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revision 93 by nigel, Sat Feb 24 21:41:42 2007 UTC revision 184 by ph10, Tue Jun 19 13:26:46 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    Version 7.2 19-June-07
5    ---------------------
6    
7     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
8        which is apparently normally available under Windows.
9    
10     2. Re-jig the pcregrep tests with different newline settings in an attempt
11        to make them independent of the local environment's newline setting.
12    
13     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
14    
15     4. Some of the "internals" tests were previously cut out when the link size
16        was not 2, because the output contained actual offsets. The recent new
17        "Z" feature of pcretest means that these can be cut out, making the tests
18        usable with all link sizes.
19    
20     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
21        stack recursion. This gives a massive performance boost under BSD, but just
22        a small improvement under Linux. However, it saves one field in the frame
23        in all cases.
24    
25     6. Added more features from the forthcoming Perl 5.10:
26    
27        (a) (?-n) (where n is a string of digits) is a relative subroutine or
28            recursion call. It refers to the nth most recently opened parentheses.
29    
30        (b) (?+n) is also a relative subroutine call; it refers to the nth next
31            to be opened parentheses.
32    
33        (c) Conditions that refer to capturing parentheses can be specified
34            relatively, for example, (?(-2)... or (?(+3)...
35    
36        (d) \K resets the start of the current match so that everything before
37            is not part of it.
38    
39        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
40    
41        (f) \g{name} is another synonym - part of Perl 5.10's unification of
42            reference syntax.
43    
44        (g) (?| introduces a group in which the numbering of parentheses in each
45            alternative starts with the same number.
46    
47        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
48    
49     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
50        PCRE_INFO_JCHANGED.
51    
52     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
53        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
54        for detecting groups that can match an empty string.
55    
56     9. A pattern with a very large number of alternatives (more than several
57        hundred) was running out of internal workspace during the pre-compile
58        phase, where pcre_compile() figures out how much memory will be needed. A
59        bit of new cunning has reduced the workspace needed for groups with
60        alternatives. The 1000-alternative test pattern now uses 12 bytes of
61        workspace instead of running out of the 4096 that are available.
62    
63    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
64    
65    11. Applied patch from Google to remove an optimization that didn't quite work.
66        The report of the bug said:
67    
68          pcrecpp::RE("a*").FullMatch("aaa") matches, while
69          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
70          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
71    
72    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
73        it matched the wrong number of bytes.
74    
75    
76    Version 7.1 24-Apr-07
77    ---------------------
78    
79     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
80        that is more "standard", making use of automake and other Autotools. There
81        is some re-arrangement of the files and adjustment of comments consequent
82        on this.
83    
84     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
85        for recursive directory scanning broke on some systems because the files
86        are not scanned in any specific order and on different systems the order
87        was different. A call to "sort" has been inserted into RunGrepTest for the
88        approprate test as a short-term fix. In the longer term there may be an
89        alternative.
90    
91     3. I had an email from Eric Raymond about problems translating some of PCRE's
92        man pages to HTML (despite the fact that I distribute HTML pages, some
93        people do their own conversions for various reasons). The problems
94        concerned the use of low-level troff macros .br and .in. I have therefore
95        removed all such uses from the man pages (some were redundant, some could
96        be replaced by .nf/.fi pairs). The 132html script that I use to generate
97        HTML has been updated to handle .nf/.fi and to complain if it encounters
98        .br or .in.
99    
100     4. Updated comments in configure.ac that get placed in config.h.in and also
101        arranged for config.h to be included in the distribution, with the name
102        config.h.generic, for the benefit of those who have to compile without
103        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
104    
105     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
106        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
107        makevp.bat for the current PCRE, using the additional files
108        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
109    
110     6. A Windows user reported a minor discrepancy with test 2, which turned out
111        to be caused by a trailing space on an input line that had got lost in his
112        copy. The trailing space was an accident, so I've just removed it.
113    
114     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
115        that is needed.
116    
117     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
118        as "const" (a) because they are and (b) because it helps the PHP
119        maintainers who have recently made a script to detect big data structures
120        in the php code that should be moved to the .rodata section. I remembered
121        to update Builducptable as well, so it won't revert if ucptable.h is ever
122        re-created.
123    
124     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
125        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
126        order to be able to cut out the UTF-8 tables in the latter when UTF-8
127        support is not required. This saves 1.5-2K of code, which is important in
128        some applications.
129    
130        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
131        so as not to refer to the tables, even though these functions will never be
132        called when UTF-8 support is disabled. Otherwise there are problems with a
133        shared library.
134    
135    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
136    
137        (a) It was defining its arguments as char * instead of void *.
138    
139        (b) It was assuming that all moves were upwards in memory; this was true
140            a long time ago when I wrote it, but is no longer the case.
141    
142        The emulated memove() is provided for those environments that have neither
143        memmove() nor bcopy(). I didn't think anyone used it these days, but that
144        is clearly not the case, as these two bugs were recently reported.
145    
146    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
147        and Detrail to create the HTML documentation, the .txt form of the man
148        pages, and it removes trailing spaces from listed files. It also creates
149        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
150        case, it wraps all the #defines with #ifndefs. This script should be run
151        before "make dist".
152    
153    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
154        with Unicode property support.
155    
156        (a) For a maximizing quantifier, if the two different cases of the
157            character were of different lengths in their UTF-8 codings (there are
158            some cases like this - I found 11), and the matching function had to
159            back up over a mixture of the two cases, it incorrectly assumed they
160            were both the same length.
161    
162        (b) When PCRE was configured to use the heap rather than the stack for
163            recursion during matching, it was not correctly preserving the data for
164            the other case of a UTF-8 character when checking ahead for a match
165            while processing a minimizing repeat. If the check also involved
166            matching a wide character, but failed, corruption could cause an
167            erroneous result when trying to check for a repeat of the original
168            character.
169    
170    13. Some tidying changes to the testing mechanism:
171    
172        (a) The RunTest script now detects the internal link size and whether there
173            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
174            values substituted by "configure". (The RunGrepTest script already did
175            this for UTF-8.) The configure.ac script no longer substitutes the
176            relevant variables.
177    
178        (b) The debugging options /B and /D in pcretest show the compiled bytecode
179            with length and offset values. This means that the output is different
180            for different internal link sizes. Test 2 is skipped for link sizes
181            other than 2 because of this, bypassing the problem. Unfortunately,
182            there was also a test in test 3 (the locale tests) that used /B and
183            failed for link sizes other than 2. Rather than cut the whole test out,
184            I have added a new /Z option to pcretest that replaces the length and
185            offset values with spaces. This is now used to make test 3 independent
186            of link size. (Test 2 will be tidied up later.)
187    
188    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
189        segmentation fault instead of returning the appropriate error message.
190    
191    15. In multiline mode when the newline sequence was set to "any", the pattern
192        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
193        This doesn't seem right; it now treats the CRLF combination as the line
194        ending, and so does not match in that case. It's only a pattern such as ^$
195        that would hit this one: something like ^ABC$ would have failed after \r
196        and then tried again after \r\n.
197    
198    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
199        in an attempt to make files that differ only in their line terminators
200        compare equal. This works on Linux.
201    
202    17. Under certain error circumstances pcregrep might try to free random memory
203        as it exited. This is now fixed, thanks to valgrind.
204    
205    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
206        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
207        was because its rules for how to advance for /g after matching an empty
208        string at the end of a line did not allow for this case. They now check for
209        it specially.
210    
211    20. pcretest is supposed to handle patterns and data of any length, by
212        extending its buffers when necessary. It was getting this wrong when the
213        buffer for a data line had to be extended.
214    
215    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
216        CRLF as a newline sequence.
217    
218    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
219        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
220        I have nevertheless tidied it up.
221    
222    23. Added some casts to kill warnings from HP-UX ia64 compiler.
223    
224    24. Added a man page for pcre-config.
225    
226    
227  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
228  ---------------------  ---------------------
229    

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