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revision 535 by ph10, Thu Jun 3 19:18:24 2010 UTC revision 605 by ph10, Fri Jun 3 18:18:30 2011 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.10 03-Jun-2010  Version 8.13 30-Apr-2011
5    ------------------------
6    
7    1.  The Unicode data tables have been updated to Unicode 6.0.0.
8    
9    2.  Two minor typos in pcre_internal.h have been fixed.
10    
11    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
12        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
13        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
14    
15    4.  There were a number of related bugs in the code for matching backrefences
16        caselessly in UTF-8 mode when codes for the characters concerned were
17        different numbers of bytes. For example, U+023A and U+2C65 are an upper
18        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
19        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
20        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
21        2-byte code at the end of the subject (it thought there wasn't enough data
22        left).
23    
24    5.  Comprehensive information about what went wrong is now returned by
25        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
26        as the output vector has at least 2 elements. The offset of the start of
27        the failing character and a reason code are placed in the vector.
28    
29    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
30        now returned is for the first byte of the failing character, instead of the
31        last byte inspected. This is an incompatible change, but I hope it is small
32        enough not to be a problem. It makes the returned offset consistent with
33        pcre_exec() and pcre_dfa_exec().
34    
35    7.  pcretest now gives a text phrase as well as the error number when
36        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
37        failure, the offset and reason code are output.
38    
39    8.  When \R was used with a maximizing quantifier it failed to skip backwards
40        over a \r\n pair if the subsequent match failed. Instead, it just skipped
41        back over a single character (\n). This seems wrong (because it treated the
42        two characters as a single entity when going forwards), conflicts with the
43        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
44        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
45        has been changed.
46    
47    9.  Some internal refactoring has changed the processing so that the handling
48        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
49        time (the PCRE_DOTALL option was changed this way some time ago: version
50        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
51        which was always a bit of a fudge. It also means that there is one less
52        argument for the match() function, which reduces its stack requirements
53        slightly. This change also fixes an incompatibility with Perl: the pattern
54        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
55    
56    10. More internal refactoring has drastically reduced the number of recursive
57        calls to match() for possessively repeated groups such as (abc)++ when
58        using pcre_exec().
59    
60    11. While implementing 10, a number of bugs in the handling of groups were
61        discovered and fixed:
62    
63        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
64        (a|)*(?1) gave a compile-time internal error.
65        ((a|)+)+  did not notice that the outer group could match an empty string.
66        (^a|^)+   was not marked as anchored.
67        (.*a|.*)+ was not marked as matching at start or after a newline.
68    
69    12. Yet more internal refactoring has removed another argument from the match()
70        function. Special calls to this function are now indicated by setting a
71        value in a variable in the "match data" data block.
72    
73    13. Be more explicit in pcre_study() instead of relying on "default" for
74        opcodes that mean there is no starting character; this means that when new
75        ones are added and accidentally left out of pcre_study(), testing should
76        pick them up.
77    
78    
79    Version 8.12 15-Jan-2011
80    ------------------------
81    
82    1.  Fixed some typos in the markup of the man pages, and wrote a script that
83        checks for such things as part of the documentation building process.
84    
85    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
86        --match-limit and --recursion-limit options (added for 8.11). In
87        particular, this made one of the standard tests fail. (The integer value
88        went into the wrong half of a long int.)
89    
90    3.  If the --colour option was given to pcregrep with -v (invert match), it
91        did strange things, either producing crazy output, or crashing. It should,
92        of course, ignore a request for colour when reporting lines that do not
93        match.
94    
95    4.  Another pcregrep bug caused similar problems if --colour was specified with
96        -M (multiline) and the pattern match finished with a line ending.
97    
98    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
99        matched in multiline mode, the following line was shown as part of the
100        match. This seems wrong, so I have changed it.
101    
102    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
103        the check for further matches in the same line (so they could be coloured)
104        to overrun the end of the current line. If another match was found, it was
105        incorrectly shown (and then shown again when found in the next line).
106    
107    7.  If pcregrep was compiled under Windows, there was a reference to the
108        function pcregrep_exit() before it was defined. I am assuming this was
109        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
110        reported by a user. I've moved the definition above the reference.
111    
112    
113    Version 8.11 10-Dec-2010
114    ------------------------
115    
116    1.  (*THEN) was not working properly if there were untried alternatives prior
117        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
118        backtracked to try for "b" instead of moving to the next alternative branch
119        at the same level (in this case, to look for "c"). The Perl documentation
120        is clear that when (*THEN) is backtracked onto, it goes to the "next
121        alternative in the innermost enclosing group".
122    
123    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
124        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
125        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
126        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
127        (*THEN).
128    
129    3.  If \s appeared in a character class, it removed the VT character from
130        the class, even if it had been included by some previous item, for example
131        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
132        of \s, but is part of the POSIX "space" class.)
133    
134    4.  A partial match never returns an empty string (because you can always
135        match an empty string at the end of the subject); however the checking for
136        an empty string was starting at the "start of match" point. This has been
137        changed to the "earliest inspected character" point, because the returned
138        data for a partial match starts at this character. This means that, for
139        example, /(?<=abc)def/ gives a partial match for the subject "abc"
140        (previously it gave "no match").
141    
142    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
143        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
144        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
145        has an implication that the given string is incomplete (because a partial
146        match is preferred over a full match). For this reason, these items now
147        give a partial match in this situation. [Aside: previously, the one case
148        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
149        match rather than a full match, which was wrong by the old rules, but is
150        now correct.]
151    
152    6.  There was a bug in the handling of #-introduced comments, recognized when
153        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
154        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
155        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
156        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
157        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
158        places in pcre_compile().
159    
160    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
161        comments when looking ahead for named forward references to subpatterns,
162        the only newline sequence it recognized was NL. It now handles newlines
163        according to the set newline convention.
164    
165    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
166        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
167        cater for a lack of strerror(). These oversights have been fixed.
168    
169    9.  Added --match-limit and --recursion-limit to pcregrep.
170    
171    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
172    
173    11. When the -o option was used, pcregrep was setting a return code of 1, even
174        when matches were found, and --line-buffered was not being honoured.
175    
176    12. Added an optional parentheses number to the -o and --only-matching options
177        of pcregrep.
178    
179    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
180        can match an empty string. The code to do it in pcretest and pcredemo
181        needed fixing:
182    
183        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
184            only one byte after an empty string match just before CRLF (this case
185            just got forgotten; "any" and "anycrlf" were OK).
186    
187        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
188            mode when an empty string match preceded an ASCII character followed by
189            a non-ASCII character. (The code for advancing by one character rather
190            than one byte was nonsense.)
191    
192        (c) The pcredemo.c sample program did not have any code at all to handle
193            the cases when CRLF is a valid newline sequence.
194    
195    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
196        as a starting offset was within the subject string. There is now a new
197        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
198        negative or greater than the length of the string. In order to test this,
199        pcretest is extended to allow the setting of negative starting offsets.
200    
201    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
202        starting offset points to the beginning of a UTF-8 character was
203        unnecessarily clumsy. I tidied it up.
204    
205    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
206        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
207    
208    17. Nobody had reported that the --include_dir option, which was added in
209        release 7.7 should have been called --include-dir (hyphen, not underscore)
210        for compatibility with GNU grep. I have changed it to --include-dir, but
211        left --include_dir as an undocumented synonym, and the same for
212        --exclude-dir, though that is not available in GNU grep, at least as of
213        release 2.5.4.
214    
215    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
216        characters from a string of bytes) have been redefined so as not to use
217        loops, in order to improve performance in some environments. At the same
218        time, I abstracted some of the common code into auxiliary macros to save
219        repetition (this should not affect the compiled code).
220    
221    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
222        compile-time error is now given if \c is not followed by an ASCII
223        character, that is, a byte less than 128. (In EBCDIC mode, the code is
224        different, and any byte value is allowed.)
225    
226    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
227        START_OPTIMIZE option, which is now allowed at compile time - but just
228        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
229        to pcregrep and other applications that have no direct access to PCRE
230        options. The new /Y option in pcretest sets this option when calling
231        pcre_compile().
232    
233    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
234        back references. Groups containing recursive back references were forced to
235        be atomic by that change, but in the case of named groups, the amount of
236        memory required was incorrectly computed, leading to "Failed: internal
237        error: code overflow". This has been fixed.
238    
239    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
240        pcretest.c, to avoid build problems in some Borland environments.
241    
242    
243    Version 8.10 25-Jun-2010
244  ------------------------  ------------------------
245    
246  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
# Line 42  Version 8.10 03-Jun-2010 Line 281  Version 8.10 03-Jun-2010
281  11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was  11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
282      studied, and the match started with a letter with a code point greater than      studied, and the match started with a letter with a code point greater than
283      127 whose first byte was different to the first byte of the other case of      127 whose first byte was different to the first byte of the other case of
284      the letter, the other case of this starting letter was not recognized.      the letter, the other case of this starting letter was not recognized
285        (#976).
 12. pcreposix.c included pcre.h before including pcre_internal.h. This caused a  
     conflict in the definition of PCRE_EXP_DECL. I have removed the include of  
     pcre.h as pcre_internal.h includes pcre.h itself. (This may be a bit of  
     historical tidying that never got done.)  
286    
287  13. If a pattern that was studied started with a repeated Unicode property  12. If a pattern that was studied started with a repeated Unicode property
288      test, for example, \p{Nd}+, there was the theoretical possibility of      test, for example, \p{Nd}+, there was the theoretical possibility of
289      setting up an incorrect bitmap of starting bytes, but fortunately it could      setting up an incorrect bitmap of starting bytes, but fortunately it could
290      not have actually happened in practice until change 8 above was made (it      not have actually happened in practice until change 8 above was made (it
291      added property types that matched character-matching opcodes).      added property types that matched character-matching opcodes).
292    
293  14. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of  13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
294      possible starting bytes for non-anchored patterns.      possible starting bytes for non-anchored patterns.
295    
296  15. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes  14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
297      \R, and also a number of cases that involve Unicode properties, both      \R, and also a number of cases that involve Unicode properties, both
298      explicit and implicit when PCRE_UCP is set.      explicit and implicit when PCRE_UCP is set.
299    
300  16. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8  15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
301      input, it could crash or give wrong results if characters with values      input, it could crash or give wrong results if characters with values
302      greater than 0xc0 were present in the subject string. (Detail: it assumed      greater than 0xc0 were present in the subject string. (Detail: it assumed
303      UTF-8 input when processing these items.)      UTF-8 input when processing these items.)
304    
305  17. Added a lot of (int) casts to avoid compiler warnings in systems where  16. Added a lot of (int) casts to avoid compiler warnings in systems where
306      size_t is 64-bit.      size_t is 64-bit (#991).
307    
308    17. Added a check for running out of memory when PCRE is compiled with
309        --disable-stack-for-recursion (#990).
310    
311    18. If the last data line in a file for pcretest does not have a newline on
312        the end, a newline was missing in the output.
313    
314  18. Added a check for running out of memory when PCRE is compiled with  19. The default pcre_chartables.c file recognizes only ASCII characters (values
315      --disable-stack-for-recursion.      less than 128) in its various bitmaps. However, there is a facility for
316        generating tables according to the current locale when PCRE is compiled. It
317        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
318        characters, are recognized by isspace() and therefore were getting set in
319        these tables, and indeed these tables seem to approximate to ISO 8859. This
320        caused a problem in UTF-8 mode when pcre_study() was used to create a list
321        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
322        which of course cannot start UTF-8 characters. I have changed the code so
323        that only real ASCII characters (less than 128) and the correct starting
324        bytes for UTF-8 encodings are set for characters greater than 127 when in
325        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
326        altogether.)
327    
328    20. Added the /T option to pcretest so as to be able to run tests with non-
329        standard character tables, thus making it possible to include the tests
330        used for 19 above in the standard set of tests.
331    
332    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
333        reference to a subpattern the other side of a comment that contains an
334        opening parenthesis caused either an internal compiling error, or a
335        reference to the wrong subpattern.
336    
337    
338  Version 8.02 19-Mar-2010  Version 8.02 19-Mar-2010

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