/[pcre]/code/trunk/ChangeLog
ViewVC logotype

Diff of /code/trunk/ChangeLog

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 663 by ph10, Mon Aug 22 14:53:12 2011 UTC revision 699 by ph10, Tue Sep 20 10:46:54 2011 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.20  Version 8.20 12-Sep-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
8     a POSIX class. After further experiments with Perl, which convinced me that     a POSIX class. After further experiments with Perl, which convinced me that
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.     in a POSIX name. This bug also affected patterns with classes that started
11       with full stops.
12    
13  2. If a pattern such as /(a)b|ac/ is matched against "ac", there is no captured  2. If a pattern such as /(a)b|ac/ is matched against "ac", there is no captured
14     substring, but while checking the failing first alternative, substring 1 is     substring, but while checking the failing first alternative, substring 1 is
15     temporarily captured. If the output vector supplied to pcre_exec() was not     temporarily captured. If the output vector supplied to pcre_exec() was not
16     big enough for this capture, the yield of the function was still zero     big enough for this capture, the yield of the function was still zero
17     ("insufficient space for captured substrings"). This cannot be totally fixed     ("insufficient space for captured substrings"). This cannot be totally fixed
18     without adding another stack variable, which seems a lot of expense for a     without adding another stack variable, which seems a lot of expense for a
19     edge case. However, I have improved the situation in cases such as     edge case. However, I have improved the situation in cases such as
20     /(a)(b)x|abc/ matched against "abc", where the return code indicates that     /(a)(b)x|abc/ matched against "abc", where the return code indicates that
21     fewer than the maximum number of slots in the ovector have been set.     fewer than the maximum number of slots in the ovector have been set.
22    
23    3. Related to (2) above: when there are more back references in a pattern than
24       slots in the output vector, pcre_exec() uses temporary memory during
25       matching, and copies in the captures as far as possible afterwards. It was
26       using the entire output vector, but this conflicts with the specification
27       that only 2/3 is used for passing back captured substrings. Now it uses only
28       the first 2/3, for compatibility. This is, of course, another edge case.
29    
30    4. Zoltan Herczeg's just-in-time compiler support has been integrated into the
31       main code base, and can be used by building with --enable-jit. When this is
32       done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
33       runtime --no-jit option is given.
34    
35    5. When the number of matches in a pcre_dfa_exec() run exactly filled the
36       ovector, the return from the function was zero, implying that there were
37       other matches that did not fit. The correct "exactly full" value is now
38       returned.
39    
40    6. If a subpattern that was called recursively or as a subroutine contained
41       (*PRUNE) or any other control that caused it to give a non-standard return,
42       invalid errors such as "Error -26 (nested recursion at the same subject
43       position)" or even infinite loops could occur.
44    
45    7. If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
46       computing the minimum length on reaching *ACCEPT, and so ended up with the
47       wrong value of 1 rather than 0. Further investigation indicates that
48       computing a minimum subject length in the presence of *ACCEPT is difficult
49       (think back references, subroutine calls), and so I have changed the code so
50       that no minimum is registered for a pattern that contains *ACCEPT.
51    
52  3. Related to (2) above: when there are more back references in a pattern than  8. If (*THEN) was present in the first (true) branch of a conditional group,
53     slots in the output vector, pcre_exec() uses temporary memory during     it was not handled as intended.
    matching, and copies in the captures as far as possible afterwards. It was  
    using the entire output vector, but this conflicts with the specification  
    that only 2/3 is used for passing back captured substrings. Now it uses only  
    the first 2/3, for compatibility. This is, of course, another edge case.  
54    
55    
56  Version 8.13 16-Aug-2011  Version 8.13 16-Aug-2011

Legend:
Removed from v.663  
changed lines
  Added in v.699

  ViewVC Help
Powered by ViewVC 1.1.5