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revision 343 by ph10, Mon Apr 21 16:30:37 2008 UTC revision 358 by ph10, Wed Jul 9 11:03:07 2008 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.7 05-Mar-08  Version 8.0 02 Jul-08
5    ---------------------
6    
7    1.  Replaced UCP searching code with optimized version as implemented for Ad
8        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
9        stage table and inline lookup instead of a function, giving speed ups of 2
10        to 5 times on some simple patterns that I tested. Permission was given to
11        distribute the MultiStage2.py script that generates the tables (it's not in
12        the tarball, but is in the Subversion repository).
13    
14    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
15        scripts.
16    
17    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
18        a group with a zero qualifier. The result of the study could be incorrect,
19        or the function might crash, depending on the pattern.
20    
21    4.  Caseless matching was not working for non-ASCII characters in back
22        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
23        It now works when Unicode Property Support is available.
24    
25    5.  In pcretest, an escape such as \x{de} in the data was always generating
26        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
27        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
28        truncation.
29    
30    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
31    
32    7.  Added two (int) casts to pcregrep when printing the difference of two
33        pointers, in case they are 64-bit values.
34    
35    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
36        test 2 if it fails.
37    
38    
39    Version 7.7 07-May-08
40  ---------------------  ---------------------
41    
42  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
43      a string to a long long, pretend we don't even have a long long." This is      a string to a long long, pretend we don't even have a long long." This is
44      done by checking for the strtoq, strtoll, and _strtoi64 functions.      done by checking for the strtoq, strtoll, and _strtoi64 functions.
45    
46  2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with  2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
47      pre-7.6 versions, which defined a global no_arg variable instead of putting      pre-7.6 versions, which defined a global no_arg variable instead of putting
48      it in the RE class. (See also #8 below.)      it in the RE class. (See also #8 below.)
49    
50  3.  Remove a line of dead code, identified by coverity and reported by Nuno  3.  Remove a line of dead code, identified by coverity and reported by Nuno
51      Lopes.      Lopes.
52    
53  4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:  4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
54    
55      (1) The include/exclude patterns were being applied to the whole pathnames      (1) The include/exclude patterns were being applied to the whole pathnames
56          of files, instead of just to the final components.          of files, instead of just to the final components.
57    
58      (2) If there was more than one level of directory, the subdirectories were      (2) If there was more than one level of directory, the subdirectories were
59          skipped unless they satisfied the include/exclude conditions. This is          skipped unless they satisfied the include/exclude conditions. This is
60          inconsistent with GNU grep (and could even be seen as contrary to the          inconsistent with GNU grep (and could even be seen as contrary to the
61          pcregrep specification - which I improved to make it absolutely clear).          pcregrep specification - which I improved to make it absolutely clear).
62          The action now is always to scan all levels of directory, and just          The action now is always to scan all levels of directory, and just
63          apply the include/exclude patterns to regular files.          apply the include/exclude patterns to regular files.
64    
65  5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used  5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
66      --exclude_dir in the tests to avoid scanning .svn directories.      --exclude_dir in the tests to avoid scanning .svn directories.
67    
68  6.  Applied Craig's patch to the QuoteMeta function so that it escapes the  6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
69      NUL character as backslash + 0 rather than backslash + NUL, because PCRE      NUL character as backslash + 0 rather than backslash + NUL, because PCRE
70      doesn't support NULs in patterns.      doesn't support NULs in patterns.
71    
72  7.  Added some missing "const"s to declarations of static tables in  7.  Added some missing "const"s to declarations of static tables in
73      pcre_compile.c and pcre_dfa_exec.c.      pcre_compile.c and pcre_dfa_exec.c.
74    
75  8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was  8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
76      caused by fix #2  above. (Subsequently also a second patch to fix the      caused by fix #2  above. (Subsequently also a second patch to fix the
77      first patch. And a third patch - this was a messy problem.)      first patch. And a third patch - this was a messy problem.)
78    
79  9.  Applied Craig's patch to remove the use of push_back().  9.  Applied Craig's patch to remove the use of push_back().
80    
81  10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX  10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
82      matching function regexec().      matching function regexec().
83    
84  11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',  11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
85      which, however, unlike Perl's \g{...}, are subroutine calls, not back      which, however, unlike Perl's \g{...}, are subroutine calls, not back
86      references. PCRE supports relative numbers with this syntax (I don't think      references. PCRE supports relative numbers with this syntax (I don't think
87      Oniguruma does).      Oniguruma does).
88    
89  12. Previously, a group with a zero repeat such as (...){0} was completely  12. Previously, a group with a zero repeat such as (...){0} was completely
90      omitted from the compiled regex. However, this means that if the group      omitted from the compiled regex. However, this means that if the group
91      was called as a subroutine from elsewhere in the pattern, things went wrong      was called as a subroutine from elsewhere in the pattern, things went wrong
92      (an internal error was given). Such groups are now left in the compiled      (an internal error was given). Such groups are now left in the compiled
93      pattern, with a new opcode that causes them to be skipped at execution      pattern, with a new opcode that causes them to be skipped at execution
94      time.      time.
95    
96  13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes  13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
97      to the way PCRE behaves:      to the way PCRE behaves:
98    
99      (a) A lone ] character is dis-allowed (Perl treats it as data).      (a) A lone ] character is dis-allowed (Perl treats it as data).
100    
101      (b) A back reference to an unmatched subpattern matches an empty string      (b) A back reference to an unmatched subpattern matches an empty string
102          (Perl fails the current match path).          (Perl fails the current match path).
103    
104      (c) A data ] in a character class must be notated as \] because if the      (c) A data ] in a character class must be notated as \] because if the
105          first data character in a class is ], it defines an empty class. (In          first data character in a class is ], it defines an empty class. (In
106          Perl it is not possible to have an empty class.) The empty class []          Perl it is not possible to have an empty class.) The empty class []
107          never matches; it forces failure and is equivalent to (*FAIL) or (?!).          never matches; it forces failure and is equivalent to (*FAIL) or (?!).
108          The negative empty class [^] matches any one character, independently          The negative empty class [^] matches any one character, independently
109          of the DOTALL setting.          of the DOTALL setting.
110    
111  14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a  14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
112      non-existent subpattern following a character class starting with ']' and      non-existent subpattern following a character class starting with ']' and
113      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
114      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
115      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
116      existencd of the subpattern, it was treating the data ']' as terminating      existencd of the subpattern, it was treating the data ']' as terminating
117      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
118      was subsequently set up correctly.)      was subsequently set up correctly.)
119    
120  15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;  15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
121      it was being rejected as not supported by pcre_dfa_exec(), even though      it was being rejected as not supported by pcre_dfa_exec(), even though
122      other assertions are supported. I have made pcre_dfa_exec() support      other assertions are supported. I have made pcre_dfa_exec() support
123      (*FAIL).      (*FAIL).
124    
125  16. The implementation of 13c above involved the invention of a new opcode,  16. The implementation of 13c above involved the invention of a new opcode,
126      OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s      OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
127      cannot be changed at match time, I realized I could make a small      cannot be changed at match time, I realized I could make a small
128      improvement to matching performance by compiling OP_ALLANY instead of      improvement to matching performance by compiling OP_ALLANY instead of
129      OP_ANY for "." when DOTALL was set, and then removing the runtime tests      OP_ANY for "." when DOTALL was set, and then removing the runtime tests
130      on the OP_ANY path.      on the OP_ANY path.
131    
132  17. Compiling pcretest on Windows with readline support failed without the  17. Compiling pcretest on Windows with readline support failed without the
133      following two fixes: (1) Make the unistd.h include conditional on      following two fixes: (1) Make the unistd.h include conditional on
134      HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.      HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
135    
136    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
137        ncurses library to be included for pcretest when ReadLine support is
138        requested, but also to allow for it to be overridden. This patch came from
139        Daniel Bergström.
140    
141    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
142        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
143        any errors with the current Unicode tables. Thanks to Peter Kankowski for
144        spotting this.
145    
146    
147  Version 7.6 28-Jan-08  Version 7.6 28-Jan-08

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