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revision 702 by ph10, Tue Sep 20 15:45:06 2011 UTC revision 735 by ph10, Thu Oct 13 15:51:27 2011 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.20 12-Sep-2011  Version 8.20 10-Oct-2011
5  ------------------------  ------------------------
6    
7  1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had  1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
# Line 9  Version 8.20 12-Sep-2011 Line 9  Version 8.20 12-Sep-2011
9      Perl has bugs and confusions, a closing square bracket is no longer allowed      Perl has bugs and confusions, a closing square bracket is no longer allowed
10      in a POSIX name. This bug also affected patterns with classes that started      in a POSIX name. This bug also affected patterns with classes that started
11      with full stops.      with full stops.
12    
13  2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no  2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
14      captured substring, but while checking the failing first alternative,      captured substring, but while checking the failing first alternative,
15      substring 1 is temporarily captured. If the output vector supplied to      substring 1 is temporarily captured. If the output vector supplied to
# Line 20  Version 8.20 12-Sep-2011 Line 20  Version 8.20 12-Sep-2011
20      such as /(a)(b)x|abc/ matched against "abc", where the return code      such as /(a)(b)x|abc/ matched against "abc", where the return code
21      indicates that fewer than the maximum number of slots in the ovector have      indicates that fewer than the maximum number of slots in the ovector have
22      been set.      been set.
23    
24  3.  Related to (2) above: when there are more back references in a pattern than  3.  Related to (2) above: when there are more back references in a pattern than
25      slots in the output vector, pcre_exec() uses temporary memory during      slots in the output vector, pcre_exec() uses temporary memory during
26      matching, and copies in the captures as far as possible afterwards. It was      matching, and copies in the captures as far as possible afterwards. It was
# Line 28  Version 8.20 12-Sep-2011 Line 28  Version 8.20 12-Sep-2011
28      that only 2/3 is used for passing back captured substrings. Now it uses      that only 2/3 is used for passing back captured substrings. Now it uses
29      only the first 2/3, for compatibility. This is, of course, another edge      only the first 2/3, for compatibility. This is, of course, another edge
30      case.      case.
31    
32  4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the  4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
33      main code base, and can be used by building with --enable-jit. When this is      main code base, and can be used by building with --enable-jit. When this is
34      done, pcregrep automatically uses it unless --disable-pcregrep-jit or the      done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
35      runtime --no-jit option is given.      runtime --no-jit option is given.
36    
37  5.  When the number of matches in a pcre_dfa_exec() run exactly filled the  5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
38      ovector, the return from the function was zero, implying that there were      ovector, the return from the function was zero, implying that there were
39      other matches that did not fit. The correct "exactly full" value is now      other matches that did not fit. The correct "exactly full" value is now
40      returned.      returned.
41    
42  6.  If a subpattern that was called recursively or as a subroutine contained  6.  If a subpattern that was called recursively or as a subroutine contained
43      (*PRUNE) or any other control that caused it to give a non-standard return,      (*PRUNE) or any other control that caused it to give a non-standard return,
44      invalid errors such as "Error -26 (nested recursion at the same subject      invalid errors such as "Error -26 (nested recursion at the same subject
45      position)" or even infinite loops could occur.      position)" or even infinite loops could occur.
46    
47  7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped  7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
48      computing the minimum length on reaching *ACCEPT, and so ended up with the      computing the minimum length on reaching *ACCEPT, and so ended up with the
49      wrong value of 1 rather than 0. Further investigation indicates that      wrong value of 1 rather than 0. Further investigation indicates that
50      computing a minimum subject length in the presence of *ACCEPT is difficult      computing a minimum subject length in the presence of *ACCEPT is difficult
51      (think back references, subroutine calls), and so I have changed the code      (think back references, subroutine calls), and so I have changed the code
52      so that no minimum is registered for a pattern that contains *ACCEPT.      so that no minimum is registered for a pattern that contains *ACCEPT.
53    
54  8.  If (*THEN) was present in the first (true) branch of a conditional group,  8.  If (*THEN) was present in the first (true) branch of a conditional group,
55      it was not handled as intended.      it was not handled as intended. [But see 16 below.]
56    
57  9.  Replaced RunTest.bat with the much improved version provided by Sheri  9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
58      Pierce.      Sheri Pierce.
59    
60  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
61      the first byte in a match must be "a".      the first byte in a match must be "a".
62    
63  11. Change 17 for 8.13 increased the recursion depth for patterns like  11. Change 17 for 8.13 increased the recursion depth for patterns like
64      /a(?:.)*?a/ drastically. I've improved things by remembering whether a      /a(?:.)*?a/ drastically. I've improved things by remembering whether a
65      pattern contains any instances of (*THEN). If it does not, the old      pattern contains any instances of (*THEN). If it does not, the old
66      optimizations are restored. It would be nice to do this on a per-group      optimizations are restored. It would be nice to do this on a per-group
67      basis, but at the moment that is not feasible.      basis, but at the moment that is not feasible.
68    
69    12. In some environments, the output of pcretest -C is CRLF terminated. This
70        broke RunTest's code that checks for the link size. A single white space
71        after the value is now allowed for.
72    
73    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
74        For "fr", it uses the Windows-specific input and output files.
75    
76    14. If (*THEN) appeared in a group that was called recursively or as a
77        subroutine, it did not work as intended. [But see next item.]
78    
79    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
80        pattern fragments (but not containing any | characters). If A and B are
81        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
82        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
83        D. In other words, Perl considers parentheses that do not contain any |
84        characters to be part of a surrounding alternative, whereas PCRE was
85        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
86        differently. PCRE now behaves in the same way as Perl, except in the case
87        of subroutine/recursion calls such as (?1) which have in any case always
88        been different (but PCRE had them first :-).
89    
90    16. Related to 15 above: Perl does not treat the | in a conditional group as
91        creating alternatives. Such a group is treated in the same way as an
92        ordinary group without any | characters when processing (*THEN). PCRE has
93        been changed to match Perl's behaviour.
94    
95    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
96        RunGrepTest script failed.
97    
98    18. Change 22 for version 13 caused atomic groups to use more stack. This is
99        inevitable for groups that contain captures, but it can lead to a lot of
100        stack use in large patterns. The old behaviour has been restored for atomic
101        groups that do not contain any capturing parentheses.
102    
103    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
104        suppress the check for a minimum subject length at run time. (If it was
105        given to pcre_exec() or pcre_dfa_exec() it did work.)
106    
107    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
108        fail to work when decoding hex characters in data strings in EBCDIC
109        environments.
110    
111    21. It appears that in at least one Mac OS environment, the isxdigit() function
112        is implemented as a macro that evaluates to its argument more than once,
113        contravening the C 90 Standard (I haven't checked a later standard). There
114        was an instance in pcretest which caused it to go wrong when processing
115        \x{...} escapes in subject strings. The has been rewritten to avoid using
116        things like p++ in the argument of isxdigit().
117    
118    
119  Version 8.13 16-Aug-2011  Version 8.13 16-Aug-2011
120  ------------------------  ------------------------

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