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ChangeLog for PCRE |
ChangeLog for PCRE |
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Version 8.0 02 Jul-08 |
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1. Replaced UCP searching code with optimized version as implemented for Ad |
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Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two- |
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stage table and inline lookup instead of a function, giving speed ups of 2 |
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to 5 times on some simple patterns that I tested. Permission was given to |
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distribute the MultiStage2.py script that generates the tables (it's not in |
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the tarball, but is in the Subversion repository). |
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2. Updated the Unicode datatables to Unicode 5.1.0. This adds yet more |
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scripts. |
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3. Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained |
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a group with a zero qualifier. The result of the study could be incorrect, |
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or the function might crash, depending on the pattern. |
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Version 7.7 07-May-08 |
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1. Applied Craig's patch to sort out a long long problem: "If we can't convert |
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a string to a long long, pretend we don't even have a long long." This is |
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done by checking for the strtoq, strtoll, and _strtoi64 functions. |
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2. Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with |
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pre-7.6 versions, which defined a global no_arg variable instead of putting |
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it in the RE class. (See also #8 below.) |
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3. Remove a line of dead code, identified by coverity and reported by Nuno |
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Lopes. |
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4. Fixed two related pcregrep bugs involving -r with --include or --exclude: |
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(1) The include/exclude patterns were being applied to the whole pathnames |
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of files, instead of just to the final components. |
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(2) If there was more than one level of directory, the subdirectories were |
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skipped unless they satisfied the include/exclude conditions. This is |
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inconsistent with GNU grep (and could even be seen as contrary to the |
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pcregrep specification - which I improved to make it absolutely clear). |
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The action now is always to scan all levels of directory, and just |
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apply the include/exclude patterns to regular files. |
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5. Added the --include_dir and --exclude_dir patterns to pcregrep, and used |
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--exclude_dir in the tests to avoid scanning .svn directories. |
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6. Applied Craig's patch to the QuoteMeta function so that it escapes the |
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NUL character as backslash + 0 rather than backslash + NUL, because PCRE |
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doesn't support NULs in patterns. |
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7. Added some missing "const"s to declarations of static tables in |
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pcre_compile.c and pcre_dfa_exec.c. |
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8. Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was |
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caused by fix #2 above. (Subsequently also a second patch to fix the |
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first patch. And a third patch - this was a messy problem.) |
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9. Applied Craig's patch to remove the use of push_back(). |
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10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX |
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matching function regexec(). |
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11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n', |
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which, however, unlike Perl's \g{...}, are subroutine calls, not back |
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references. PCRE supports relative numbers with this syntax (I don't think |
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Oniguruma does). |
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12. Previously, a group with a zero repeat such as (...){0} was completely |
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omitted from the compiled regex. However, this means that if the group |
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was called as a subroutine from elsewhere in the pattern, things went wrong |
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(an internal error was given). Such groups are now left in the compiled |
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pattern, with a new opcode that causes them to be skipped at execution |
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time. |
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13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes |
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to the way PCRE behaves: |
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(a) A lone ] character is dis-allowed (Perl treats it as data). |
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(b) A back reference to an unmatched subpattern matches an empty string |
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(Perl fails the current match path). |
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(c) A data ] in a character class must be notated as \] because if the |
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first data character in a class is ], it defines an empty class. (In |
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Perl it is not possible to have an empty class.) The empty class [] |
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never matches; it forces failure and is equivalent to (*FAIL) or (?!). |
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The negative empty class [^] matches any one character, independently |
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of the DOTALL setting. |
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14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a |
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non-existent subpattern following a character class starting with ']' and |
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containing () gave an internal compiling error instead of "reference to |
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non-existent subpattern". Fortunately, when the pattern did exist, the |
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compiled code was correct. (When scanning forwards to check for the |
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existencd of the subpattern, it was treating the data ']' as terminating |
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the class, so got the count wrong. When actually compiling, the reference |
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was subsequently set up correctly.) |
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15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile; |
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it was being rejected as not supported by pcre_dfa_exec(), even though |
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other assertions are supported. I have made pcre_dfa_exec() support |
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(*FAIL). |
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16. The implementation of 13c above involved the invention of a new opcode, |
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OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s |
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cannot be changed at match time, I realized I could make a small |
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improvement to matching performance by compiling OP_ALLANY instead of |
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OP_ANY for "." when DOTALL was set, and then removing the runtime tests |
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on the OP_ANY path. |
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17. Compiling pcretest on Windows with readline support failed without the |
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following two fixes: (1) Make the unistd.h include conditional on |
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HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno. |
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18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the |
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ncurses library to be included for pcretest when ReadLine support is |
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requested, but also to allow for it to be overridden. This patch came from |
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Daniel Bergström. |
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19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined |
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as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused |
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any errors with the current Unicode tables. Thanks to Peter Kankowski for |
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spotting this. |
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Version 7.6 28-Jan-08 |
Version 7.6 28-Jan-08 |
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--------------------- |
--------------------- |
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