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-revision 538 by ph10,
Wed Jun  9 19:30:57 2010 UTC
+revision 608 by ph10,
Sun Jun 12 16:25:55 2011 UTC
 Line 1
  ChangeLog for PCRE
  ------------------
- Version 8.10 03-Jun-2010
+ Version 8.13 30-Apr-2011
+ ------------------------
+.  The Unicode data tables have been updated to Unicode 6.0.0.
+.  Two minor typos in pcre_internal.h have been fixed.
+.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
+     pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
+     in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
+.  There were a number of related bugs in the code for matching backrefences
+     caselessly in UTF-8 mode when codes for the characters concerned were
+     different numbers of bytes. For example, U+023A and U+2C65 are an upper
+     and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
+     (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
+     code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
+-byte code at the end of the subject (it thought there wasn't enough data
+     left).
+.  Comprehensive information about what went wrong is now returned by
+     pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
+     as the output vector has at least 2 elements. The offset of the start of
+     the failing character and a reason code are placed in the vector.
+.  When the UTF-8 string check fails for pcre_compile(), the offset that is
+     now returned is for the first byte of the failing character, instead of the
+     last byte inspected. This is an incompatible change, but I hope it is small
+     enough not to be a problem. It makes the returned offset consistent with
+     pcre_exec() and pcre_dfa_exec().
+.  pcretest now gives a text phrase as well as the error number when
+     pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
+     failure, the offset and reason code are output.
+.  When \R was used with a maximizing quantifier it failed to skip backwards
+     over a \r\n pair if the subsequent match failed. Instead, it just skipped
+     back over a single character (\n). This seems wrong (because it treated the
+     two characters as a single entity when going forwards), conflicts with the
+     documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
+     behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
+     has been changed.
+.  Some internal refactoring has changed the processing so that the handling
+     of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
+     time (the PCRE_DOTALL option was changed this way some time ago: version
+.7 change 16). This has made it possible to abolish the OP_OPT op code,
+     which was always a bit of a fudge. It also means that there is one less
+     argument for the match() function, which reduces its stack requirements
+     slightly. This change also fixes an incompatibility with Perl: the pattern
+     (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
+. More internal refactoring has drastically reduced the number of recursive
+     calls to match() for possessively repeated groups such as (abc)++ when
+     using pcre_exec().
+. While implementing 10, a number of bugs in the handling of groups were
+     discovered and fixed:
+     (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
+     (a|)*(?1) gave a compile-time internal error.
+     ((a|)+)+  did not notice that the outer group could match an empty string.
+     (^a|^)+   was not marked as anchored.
+     (.*a|.*)+ was not marked as matching at start or after a newline.
+. Yet more internal refactoring has removed another argument from the match()
+     function. Special calls to this function are now indicated by setting a
+     value in a variable in the "match data" data block.
+. Be more explicit in pcre_study() instead of relying on "default" for
+     opcodes that mean there is no starting character; this means that when new
+     ones are added and accidentally left out of pcre_study(), testing should
+     pick them up.
+. The -s option of pcretest has been documented for ages as being an old
+     synonym of -m (show memory usage). I have changed it to mean "force study
+     for every regex", that is, assume /S for every regex. This is similar to -i
+     and -d etc. It's slightly incompatible, but I'm hoping nobody is still
+     using it. It makes it easier to run collection of tests with study enabled,
+     and thereby test pcre_study() more easily.
+. When (*ACCEPT) was used in a subpattern that was called recursively, the
+     restoration of the capturing data to the outer values was not happening
+     correctly.
+. If a recursively called subpattern ended with (*ACCEPT) and matched an
+     empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
+     pattern had matched an empty string, and so incorrectly returned a no
+     match.
+ Version 8.12 15-Jan-2011
+ ------------------------
+.  Fixed some typos in the markup of the man pages, and wrote a script that
+     checks for such things as part of the documentation building process.
+.  On a big-endian 64-bit system, pcregrep did not correctly process the
+     --match-limit and --recursion-limit options (added for 8.11). In
+     particular, this made one of the standard tests fail. (The integer value
+     went into the wrong half of a long int.)
+.  If the --colour option was given to pcregrep with -v (invert match), it
+     did strange things, either producing crazy output, or crashing. It should,
+     of course, ignore a request for colour when reporting lines that do not
+     match.
+.  Another pcregrep bug caused similar problems if --colour was specified with
+     -M (multiline) and the pattern match finished with a line ending.
+.  In pcregrep, when a pattern that ended with a literal newline sequence was
+     matched in multiline mode, the following line was shown as part of the
+     match. This seems wrong, so I have changed it.
+.  Another pcregrep bug in multiline mode, when --colour was specified, caused
+     the check for further matches in the same line (so they could be coloured)
+     to overrun the end of the current line. If another match was found, it was
+     incorrectly shown (and then shown again when found in the next line).
+.  If pcregrep was compiled under Windows, there was a reference to the
+     function pcregrep_exit() before it was defined. I am assuming this was
+     the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
+     reported by a user. I've moved the definition above the reference.
+ Version 8.11 10-Dec-2010
+ ------------------------
+.  (*THEN) was not working properly if there were untried alternatives prior
+     to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
+     backtracked to try for "b" instead of moving to the next alternative branch
+     at the same level (in this case, to look for "c"). The Perl documentation
+     is clear that when (*THEN) is backtracked onto, it goes to the "next
+     alternative in the innermost enclosing group".
+.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
+     such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
+     result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
+     (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
+     (*THEN).
+.  If \s appeared in a character class, it removed the VT character from
+     the class, even if it had been included by some previous item, for example
+     in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
+     of \s, but is part of the POSIX "space" class.)
+.  A partial match never returns an empty string (because you can always
+     match an empty string at the end of the subject); however the checking for
+     an empty string was starting at the "start of match" point. This has been
+     changed to the "earliest inspected character" point, because the returned
+     data for a partial match starts at this character. This means that, for
+     example, /(?<=abc)def/ gives a partial match for the subject "abc"
+     (previously it gave "no match").
+.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
+     of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
+     previously a full match would be given. However, setting PCRE_PARTIAL_HARD
+     has an implication that the given string is incomplete (because a partial
+     match is preferred over a full match). For this reason, these items now
+     give a partial match in this situation. [Aside: previously, the one case
+     /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
+     match rather than a full match, which was wrong by the old rules, but is
+     now correct.]
+.  There was a bug in the handling of #-introduced comments, recognized when
+     PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
+     If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
+     UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
+     scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
+     but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
+     places in pcre_compile().
+.  Related to (6) above, when pcre_compile() was skipping #-introduced
+     comments when looking ahead for named forward references to subpatterns,
+     the only newline sequence it recognized was NL. It now handles newlines
+     according to the set newline convention.
+.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
+     former, but used strtoul(), whereas pcretest avoided strtoul() but did not
+     cater for a lack of strerror(). These oversights have been fixed.
+.  Added --match-limit and --recursion-limit to pcregrep.
+. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
+. When the -o option was used, pcregrep was setting a return code of 1, even
+     when matches were found, and --line-buffered was not being honoured.
+. Added an optional parentheses number to the -o and --only-matching options
+     of pcregrep.
+. Imitating Perl's /g action for multiple matches is tricky when the pattern
+     can match an empty string. The code to do it in pcretest and pcredemo
+     needed fixing:
+     (a) When the newline convention was "crlf", pcretest got it wrong, skipping
+         only one byte after an empty string match just before CRLF (this case
+         just got forgotten; "any" and "anycrlf" were OK).
+     (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
+         mode when an empty string match preceded an ASCII character followed by
+         a non-ASCII character. (The code for advancing by one character rather
+         than one byte was nonsense.)
+     (c) The pcredemo.c sample program did not have any code at all to handle
+         the cases when CRLF is a valid newline sequence.
+. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
+     as a starting offset was within the subject string. There is now a new
+     error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
+     negative or greater than the length of the string. In order to test this,
+     pcretest is extended to allow the setting of negative starting offsets.
+. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
+     starting offset points to the beginning of a UTF-8 character was
+     unnecessarily clumsy. I tidied it up.
+. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
+     bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
+. Nobody had reported that the --include_dir option, which was added in
+     release 7.7 should have been called --include-dir (hyphen, not underscore)
+     for compatibility with GNU grep. I have changed it to --include-dir, but
+     left --include_dir as an undocumented synonym, and the same for
+     --exclude-dir, though that is not available in GNU grep, at least as of
+     release 2.5.4.
+. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
+     characters from a string of bytes) have been redefined so as not to use
+     loops, in order to improve performance in some environments. At the same
+     time, I abstracted some of the common code into auxiliary macros to save
+     repetition (this should not affect the compiled code).
+. If \c was followed by a multibyte UTF-8 character, bad things happened. A
+     compile-time error is now given if \c is not followed by an ASCII
+     character, that is, a byte less than 128. (In EBCDIC mode, the code is
+     different, and any byte value is allowed.)
+. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
+     START_OPTIMIZE option, which is now allowed at compile time - but just
+     passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
+     to pcregrep and other applications that have no direct access to PCRE
+     options. The new /Y option in pcretest sets this option when calling
+     pcre_compile().
+. Change 18 of release 8.01 broke the use of named subpatterns for recursive
+     back references. Groups containing recursive back references were forced to
+     be atomic by that change, but in the case of named groups, the amount of
+     memory required was incorrectly computed, leading to "Failed: internal
+     error: code overflow". This has been fixed.
+. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
+     pcretest.c, to avoid build problems in some Borland environments.
+ Version 8.10 25-Jun-2010
  ------------------------
 .  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
-Line 42 
 Version 8.10 03-Jun-2010
+Line 297 
 Version 8.10 03-Jun-2010
 . In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
      studied, and the match started with a letter with a code point greater than
 whose first byte was different to the first byte of the other case of
      the letter, the other case of this starting letter was not recognized
      (#976).
 . If a pattern that was studied started with a repeated Unicode property
-Line 68 
 Version 8.10 03-Jun-2010
+Line 323 
 Version 8.10 03-Jun-2010
 . Added a check for running out of memory when PCRE is compiled with
      --disable-stack-for-recursion (#990).
 . If the last data line in a file for pcretest does not have a newline on
      the end, a newline was missing in the output.
 . The default pcre_chartables.c file recognizes only ASCII characters (values
      less than 128) in its various bitmaps. However, there is a facility for
      generating tables according to the current locale when PCRE is compiled. It
      turns out that in some environments, 0x85 and 0xa0, which are Unicode space
      characters, are recognized by isspace() and therefore were getting set in
-     these tables. This caused a problem in UTF-8 mode when pcre_study() was
+     these tables, and indeed these tables seem to approximate to ISO 8859. This
-     used to create a list of bytes that can start a match. For \s, it was
+     caused a problem in UTF-8 mode when pcre_study() was used to create a list
-     including 0x85 and 0xa0, which of course cannot start UTF-8 characters. I
+     of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
-     have changed the code so that only real ASCII characters (less than 128)
+     which of course cannot start UTF-8 characters. I have changed the code so
-     are set in this case because the \s etc escapes are documented as
+     that only real ASCII characters (less than 128) and the correct starting
-     recognizing only ASCII characters. (When PCRE_UCP is set - see 9 above -
+     bytes for UTF-8 encodings are set for characters greater than 127 when in
-     the code is different altogether.)
+     UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
+     altogether.)
+. Added the /T option to pcretest so as to be able to run tests with non-
+     standard character tables, thus making it possible to include the tests
+     used for 19 above in the standard set of tests.
+. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
+     reference to a subpattern the other side of a comment that contains an
+     opening parenthesis caused either an internal compiling error, or a
+     reference to the wrong subpattern.
  Version 8.02 19-Mar-2010

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