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

Diff of /code/trunk/ChangeLog

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

revision 637 by ph10, Sun Jul 24 17:44:12 2011 UTC revision 963 by ph10, Sat Apr 21 18:06:31 2012 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.13 30-Apr-2011  Version 8.31
5    -----------------------------
6    
7    1.  Fixing a wrong JIT test case and some compiler warnings.
8    
9    2.  Removed a bashism from the RunTest script.
10    
11    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
12        to unsigned type, result still unsigned" that was given by an MS compiler
13        on encountering the code "-sizeof(xxx)".
14    
15    4.  Partial matching support is added to the JIT compiler.
16    
17    5.  Fixed several bugs concerned with partial matching of items that consist
18        of more than one character:
19    
20        (a) /^(..)\1/ did not partially match "aba" because checking references was
21            done on an "all or nothing" basis. This also applied to repeated
22            references.
23    
24        (b) \R did not give a hard partial match if \r was found at the end of the
25            subject.
26    
27        (c) \X did not give a hard partial match after matching one or more
28            characters at the end of the subject.
29    
30        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
31            a partial match for the string "\r".
32    
33        (e) When newline was set to CRLF, the metacharacter "." did not recognize
34            a partial match for a CR character at the end of the subject string.
35    
36    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
37        running pcretest, the text "(JIT)" added to the output whenever JIT is
38        actually used to run the match.
39    
40    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
41        or /S+[+] with a digit between 1 and 7.
42    
43    8.  OP_NOT now supports any UTF character not just single-byte ones.
44    
45    9.  (*MARK) control verb is now supported by the JIT compiler.
46    
47    10. The command "./RunTest list" lists the available tests without actually
48        running any of them. (Because I keep forgetting what they all are.)
49    
50    11. Add PCRE_INFO_MAXLOOKBEHIND.
51    
52    12. Applied a (slightly modified) user-supplied patch that improves performance
53        when the heap is used for recursion (compiled with --disable-stack-for-
54        recursion). Instead of malloc and free for each heap frame each time a
55        logical recursion happens, frames are retained on a chain and re-used where
56        possible. This sometimes gives as much as 30% improvement.
57    
58    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
59        call.
60    
61    14. As documented, (*COMMIT) is now confined to within a positive assertion.
62    
63    15. It is now possible to link pcretest with libedit as an alternative to
64        libreadline.
65    
66    16. (*COMMIT) control verb is now supported by the JIT compiler.
67    
68    17. The Unicode data tables have been updated to Unicode 6.1.0.
69    
70    18. Added --file-list option to pcregrep.
71    
72    19. Added binary file support to pcregrep, including the -a, --binary-files,
73        -I, and --text options.
74    
75    20. The madvise function is renamed for posix_madvise for QNX compatibility
76        reasons. Fixed by Giuseppe D'Angelo.
77    
78    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
79    
80    22. Changed the option for creating symbolic links for 16-bit man pages from
81        -s to -sf so that re-installing does not cause issues.
82    
83    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
84    
85    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
86        matches in certain environments (the workspace was not being correctly
87        retained). Also added to pcre_dfa_exec() a simple plausibility check on
88        some of the workspace data at the beginning of a restart.
89    
90    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
91        was not doing so when it should - probably a typo introduced by SVN 528
92        (change 8.10/14).
93    
94    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
95        \w+ when the character tables indicated that \x{c4} was a word character.
96        There were several related cases, all because the tests for doing a table
97        lookup were testing for characters less than 127 instead of 255.
98    
99    27. If a pattern contains capturing parentheses that are not used in a match,
100        their slots in the ovector are set to -1. For those that are higher than
101        any matched groups, this happens at the end of processing. In the case when
102        there were back references that the ovector was too small to contain
103        (causing temporary malloc'd memory to be used during matching), and the
104        highest capturing number was not used, memory off the end of the ovector
105        was incorrectly being set to -1. (It was using the size of the temporary
106        memory instead of the true size.)
107    
108    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
109        ovector size, it uses memory at the end of the block that it has got.
110    
111    
112    Version 8.30 04-February-2012
113    -----------------------------
114    
115    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
116        name is defined in ctype.h.
117    
118    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
119        only in quite long subpatterns.
120    
121    3.  Removed the function pcre_info(), which has been obsolete and deprecated
122        since it was replaced by pcre_fullinfo() in February 2000.
123    
124    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
125        match a (*MARK), and the match failed at the start of the subject, a
126        reference to memory before the start of the subject could occur. This bug
127        was introduced by fix 17 of release 8.21.
128    
129    5.  A reference to an unset group with zero minimum repetition was giving
130        totally wrong answers (in non-JavaScript-compatibility mode). For example,
131        /(another)?(\1?)test/ matched against "hello world test". This bug was
132        introduced in release 8.13.
133    
134    6.  Add support for 16-bit character strings (a large amount of work involving
135        many changes and refactorings).
136    
137    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
138        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
139        from a file.
140    
141    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
142        rounding is not applied in this particular case).
143    
144    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
145        if they appear, or are escaped, in patterns.
146    
147    10. Get rid of a number of -Wunused-but-set-variable warnings.
148    
149    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
150        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
151        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
152        also returns the mark "x". This bug applied to capturing parentheses,
153        non-capturing parentheses, and atomic parentheses. It also applied to some
154        assertions.
155    
156    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
157        information out of configure.ac instead of relying on pcre.h.generic, which
158        is not stored in the repository.
159    
160    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
161        -lreadline.
162    
163    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
164    
165    15. Applied Graycode's patch to put the top-level frame on the stack rather
166        than the heap when not using the stack for recursion. This gives a
167        performance improvement in many cases when recursion is not deep.
168    
169    16. Experimental code added to "pcretest -C" to output the stack frame size.
170    
171    
172    Version 8.21 12-Dec-2011
173    ------------------------
174    
175    1.  Updating the JIT compiler.
176    
177    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
178        are added as well.
179    
180    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
181        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
182        calling _pcre_jit_exec. Some extra comments are added.
183    
184    4.  (*MARK) settings inside atomic groups that do not contain any capturing
185        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
186        was introduced by change 18 for 8.20.
187    
188    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
189        ECMA-262 standard.
190    
191    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
192        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
193        This bug was probably introduced by change 9 of 8.13.
194    
195    7.  While fixing 6 above, I noticed that a number of other items were being
196        incorrectly rejected as "not fixed length". This arose partly because newer
197        opcodes had not been added to the fixed-length checking code. I have (a)
198        corrected the bug and added tests for these items, and (b) arranged for an
199        error to occur if an unknown opcode is encountered while checking for fixed
200        length instead of just assuming "not fixed length". The items that were
201        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
202        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
203        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
204    
205    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
206        being incorrectly compiled and would have given unpredicatble results.
207    
208    9.  A possessively repeated subpattern with minimum repeat count greater than
209        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
210        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
211        the first (A) could occur when it should not.
212    
213    10. Add a cast and remove a redundant test from the code.
214    
215    11. JIT should use pcre_malloc/pcre_free for allocation.
216    
217    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
218        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
219        is anything other than /usr, -L is still shown).
220    
221    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
222    
223    14. Perl does not support \N without a following name in a [] class; PCRE now
224        also gives an error.
225    
226    15. If a forward reference was repeated with an upper limit of around 2000,
227        it caused the error "internal error: overran compiling workspace". The
228        maximum number of forward references (including repeats) was limited by the
229        internal workspace, and dependent on the LINK_SIZE. The code has been
230        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
231        the default depends on LINK_SIZE. There is a new upper limit (for safety)
232        of around 200,000 forward references. While doing this, I also speeded up
233        the filling in of repeated forward references.
234    
235    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
236        incorrectly expecting the subject to contain another "a" after the start.
237    
238    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
239        in the match, the SKIP should be ignored. This was not happening; instead
240        the SKIP was being treated as NOMATCH. For patterns such as
241        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
242        tested.
243    
244    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
245        now much more compatible with Perl, in particular in cases where the result
246        is a non-match for a non-anchored pattern. For example, if
247        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
248        "m", where previously it did not return a name. A side effect of this
249        change is that for partial matches, the last encountered mark name is
250        returned, as for non matches. A number of tests that were previously not
251        Perl-compatible have been moved into the Perl-compatible test files. The
252        refactoring has had the pleasing side effect of removing one argument from
253        the match() function, thus reducing its stack requirements.
254    
255    19. If the /S+ option was used in pcretest to study a pattern using JIT,
256        subsequent uses of /S (without +) incorrectly behaved like /S+.
257    
258    21. Retrieve executable code size support for the JIT compiler and fixing
259        some warnings.
260    
261    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
262        not work when the shorter character appeared right at the end of the
263        subject string.
264    
265    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
266        systems.
267    
268    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
269        output it when the /M option is used in pcretest.
270    
271    25. The CheckMan script was not being included in the distribution. Also, added
272        an explicit "perl" to run Perl scripts from the PrepareRelease script
273        because this is reportedly needed in Windows.
274    
275    26. If study data was being save in a file and studying had not found a set of
276        "starts with" bytes for the pattern, the data written to the file (though
277        never used) was taken from uninitialized memory and so caused valgrind to
278        complain.
279    
280    27. Updated RunTest.bat as provided by Sheri Pierce.
281    
282    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
283    
284    29. Computation of memory usage for the table of capturing group names was
285        giving an unnecessarily large value.
286    
287    
288    Version 8.20 21-Oct-2011
289    ------------------------
290    
291    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
292        a POSIX class. After further experiments with Perl, which convinced me that
293        Perl has bugs and confusions, a closing square bracket is no longer allowed
294        in a POSIX name. This bug also affected patterns with classes that started
295        with full stops.
296    
297    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
298        captured substring, but while checking the failing first alternative,
299        substring 1 is temporarily captured. If the output vector supplied to
300        pcre_exec() was not big enough for this capture, the yield of the function
301        was still zero ("insufficient space for captured substrings"). This cannot
302        be totally fixed without adding another stack variable, which seems a lot
303        of expense for a edge case. However, I have improved the situation in cases
304        such as /(a)(b)x|abc/ matched against "abc", where the return code
305        indicates that fewer than the maximum number of slots in the ovector have
306        been set.
307    
308    3.  Related to (2) above: when there are more back references in a pattern than
309        slots in the output vector, pcre_exec() uses temporary memory during
310        matching, and copies in the captures as far as possible afterwards. It was
311        using the entire output vector, but this conflicts with the specification
312        that only 2/3 is used for passing back captured substrings. Now it uses
313        only the first 2/3, for compatibility. This is, of course, another edge
314        case.
315    
316    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
317        main code base, and can be used by building with --enable-jit. When this is
318        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
319        runtime --no-jit option is given.
320    
321    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
322        ovector, the return from the function was zero, implying that there were
323        other matches that did not fit. The correct "exactly full" value is now
324        returned.
325    
326    6.  If a subpattern that was called recursively or as a subroutine contained
327        (*PRUNE) or any other control that caused it to give a non-standard return,
328        invalid errors such as "Error -26 (nested recursion at the same subject
329        position)" or even infinite loops could occur.
330    
331    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
332        computing the minimum length on reaching *ACCEPT, and so ended up with the
333        wrong value of 1 rather than 0. Further investigation indicates that
334        computing a minimum subject length in the presence of *ACCEPT is difficult
335        (think back references, subroutine calls), and so I have changed the code
336        so that no minimum is registered for a pattern that contains *ACCEPT.
337    
338    8.  If (*THEN) was present in the first (true) branch of a conditional group,
339        it was not handled as intended. [But see 16 below.]
340    
341    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
342        Sheri Pierce.
343    
344    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
345        the first byte in a match must be "a".
346    
347    11. Change 17 for 8.13 increased the recursion depth for patterns like
348        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
349        pattern contains any instances of (*THEN). If it does not, the old
350        optimizations are restored. It would be nice to do this on a per-group
351        basis, but at the moment that is not feasible.
352    
353    12. In some environments, the output of pcretest -C is CRLF terminated. This
354        broke RunTest's code that checks for the link size. A single white space
355        character after the value is now allowed for.
356    
357    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
358        For "fr", it uses the Windows-specific input and output files.
359    
360    14. If (*THEN) appeared in a group that was called recursively or as a
361        subroutine, it did not work as intended. [But see next item.]
362    
363    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
364        pattern fragments (but not containing any | characters). If A and B are
365        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
366        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
367        D. In other words, Perl considers parentheses that do not contain any |
368        characters to be part of a surrounding alternative, whereas PCRE was
369        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
370        differently. PCRE now behaves in the same way as Perl, except in the case
371        of subroutine/recursion calls such as (?1) which have in any case always
372        been different (but PCRE had them first :-).
373    
374    16. Related to 15 above: Perl does not treat the | in a conditional group as
375        creating alternatives. Such a group is treated in the same way as an
376        ordinary group without any | characters when processing (*THEN). PCRE has
377        been changed to match Perl's behaviour.
378    
379    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
380        RunGrepTest script failed.
381    
382    18. Change 22 for version 13 caused atomic groups to use more stack. This is
383        inevitable for groups that contain captures, but it can lead to a lot of
384        stack use in large patterns. The old behaviour has been restored for atomic
385        groups that do not contain any capturing parentheses.
386    
387    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
388        suppress the check for a minimum subject length at run time. (If it was
389        given to pcre_exec() or pcre_dfa_exec() it did work.)
390    
391    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
392        fail to work when decoding hex characters in data strings in EBCDIC
393        environments.
394    
395    21. It appears that in at least one Mac OS environment, the isxdigit() function
396        is implemented as a macro that evaluates to its argument more than once,
397        contravening the C 90 Standard (I haven't checked a later standard). There
398        was an instance in pcretest which caused it to go wrong when processing
399        \x{...} escapes in subject strings. The has been rewritten to avoid using
400        things like p++ in the argument of isxdigit().
401    
402    
403    Version 8.13 16-Aug-2011
404  ------------------------  ------------------------
405    
406  1.  The Unicode data tables have been updated to Unicode 6.0.0.  1.  The Unicode data tables have been updated to Unicode 6.0.0.
# Line 20  Version 8.13 30-Apr-2011 Line 419  Version 8.13 30-Apr-2011
419      code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a      code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
420      2-byte code at the end of the subject (it thought there wasn't enough data      2-byte code at the end of the subject (it thought there wasn't enough data
421      left).      left).
422    
423  5.  Comprehensive information about what went wrong is now returned by  5.  Comprehensive information about what went wrong is now returned by
424      pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long      pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
425      as the output vector has at least 2 elements. The offset of the start of      as the output vector has at least 2 elements. The offset of the start of
426      the failing character and a reason code are placed in the vector.      the failing character and a reason code are placed in the vector.
427    
428  6.  When the UTF-8 string check fails for pcre_compile(), the offset that is  6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
429      now returned is for the first byte of the failing character, instead of the      now returned is for the first byte of the failing character, instead of the
430      last byte inspected. This is an incompatible change, but I hope it is small      last byte inspected. This is an incompatible change, but I hope it is small
431      enough not to be a problem. It makes the returned offset consistent with      enough not to be a problem. It makes the returned offset consistent with
432      pcre_exec() and pcre_dfa_exec().      pcre_exec() and pcre_dfa_exec().
433    
434  7.  pcretest now gives a text phrase as well as the error number when  7.  pcretest now gives a text phrase as well as the error number when
435      pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check      pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
436      failure, the offset and reason code are output.      failure, the offset and reason code are output.
437    
438  8.  When \R was used with a maximizing quantifier it failed to skip backwards  8.  When \R was used with a maximizing quantifier it failed to skip backwards
439      over a \r\n pair if the subsequent match failed. Instead, it just skipped      over a \r\n pair if the subsequent match failed. Instead, it just skipped
440      back over a single character (\n). This seems wrong (because it treated the      back over a single character (\n). This seems wrong (because it treated the
441      two characters as a single entity when going forwards), conflicts with the      two characters as a single entity when going forwards), conflicts with the
442      documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the      documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
443      behaviour of \R* different to (\R)*, which also seems wrong. The behaviour      behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
444      has been changed.      has been changed.
445    
446  9.  Some internal refactoring has changed the processing so that the handling  9.  Some internal refactoring has changed the processing so that the handling
447      of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile      of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
448      time (the PCRE_DOTALL option was changed this way some time ago: version      time (the PCRE_DOTALL option was changed this way some time ago: version
449      7.7 change 16). This has made it possible to abolish the OP_OPT op code,      7.7 change 16). This has made it possible to abolish the OP_OPT op code,
450      which was always a bit of a fudge. It also means that there is one less      which was always a bit of a fudge. It also means that there is one less
451      argument for the match() function, which reduces its stack requirements      argument for the match() function, which reduces its stack requirements
452      slightly. This change also fixes an incompatibility with Perl: the pattern      slightly. This change also fixes an incompatibility with Perl: the pattern
453      (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.      (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
454    
455  10. More internal refactoring has drastically reduced the number of recursive  10. More internal refactoring has drastically reduced the number of recursive
456      calls to match() for possessively repeated groups such as (abc)++ when      calls to match() for possessively repeated groups such as (abc)++ when
457      using pcre_exec().      using pcre_exec().
458    
459  11. While implementing 10, a number of bugs in the handling of groups were  11. While implementing 10, a number of bugs in the handling of groups were
460      discovered and fixed:      discovered and fixed:
461    
462      (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).      (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
463      (a|)*(?1) gave a compile-time internal error.      (a|)*(?1) gave a compile-time internal error.
464      ((a|)+)+  did not notice that the outer group could match an empty string.      ((a|)+)+  did not notice that the outer group could match an empty string.
465      (^a|^)+   was not marked as anchored.      (^a|^)+   was not marked as anchored.
466      (.*a|.*)+ was not marked as matching at start or after a newline.      (.*a|.*)+ was not marked as matching at start or after a newline.
467    
468  12. Yet more internal refactoring has removed another argument from the match()  12. Yet more internal refactoring has removed another argument from the match()
469      function. Special calls to this function are now indicated by setting a      function. Special calls to this function are now indicated by setting a
470      value in a variable in the "match data" data block.      value in a variable in the "match data" data block.
471    
472  13. Be more explicit in pcre_study() instead of relying on "default" for  13. Be more explicit in pcre_study() instead of relying on "default" for
473      opcodes that mean there is no starting character; this means that when new      opcodes that mean there is no starting character; this means that when new
474      ones are added and accidentally left out of pcre_study(), testing should      ones are added and accidentally left out of pcre_study(), testing should
475      pick them up.      pick them up.
476    
477  14. The -s option of pcretest has been documented for ages as being an old  14. The -s option of pcretest has been documented for ages as being an old
478      synonym of -m (show memory usage). I have changed it to mean "force study      synonym of -m (show memory usage). I have changed it to mean "force study
479      for every regex", that is, assume /S for every regex. This is similar to -i      for every regex", that is, assume /S for every regex. This is similar to -i
480      and -d etc. It's slightly incompatible, but I'm hoping nobody is still      and -d etc. It's slightly incompatible, but I'm hoping nobody is still
481      using it. It makes it easier to run collections of tests with and without      using it. It makes it easier to run collections of tests with and without
482      study enabled, and thereby test pcre_study() more easily. All the standard      study enabled, and thereby test pcre_study() more easily. All the standard
483      tests are now run with and without -s (but some patterns can be marked as      tests are now run with and without -s (but some patterns can be marked as
484      "never study" - see 20 below).      "never study" - see 20 below).
485    
486  15. When (*ACCEPT) was used in a subpattern that was called recursively, the  15. When (*ACCEPT) was used in a subpattern that was called recursively, the
487      restoration of the capturing data to the outer values was not happening      restoration of the capturing data to the outer values was not happening
488      correctly.      correctly.
489    
490  16. If a recursively called subpattern ended with (*ACCEPT) and matched an  16. If a recursively called subpattern ended with (*ACCEPT) and matched an
491      empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole      empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
492      pattern had matched an empty string, and so incorrectly returned a no      pattern had matched an empty string, and so incorrectly returned a no
493      match.      match.
494    
495  17. There was optimizing code for the last branch of non-capturing parentheses,  17. There was optimizing code for the last branch of non-capturing parentheses,
496      and also for the obeyed branch of a conditional subexpression, which used      and also for the obeyed branch of a conditional subexpression, which used
497      tail recursion to cut down on stack usage. Unfortunately, not that there is      tail recursion to cut down on stack usage. Unfortunately, now that there is
498      the possibility of (*THEN) occurring in these branches, tail recursion is      the possibility of (*THEN) occurring in these branches, tail recursion is
499      no longer possible because the return has to be checked for (*THEN). These      no longer possible because the return has to be checked for (*THEN). These
500      two optimizations have therefore been removed.      two optimizations have therefore been removed. [But see 8.20/11 above.]
501    
502  18. If a pattern containing \R was studied, it was assumed that \R always  18. If a pattern containing \R was studied, it was assumed that \R always
503      matched two bytes, thus causing the minimum subject length to be      matched two bytes, thus causing the minimum subject length to be
504      incorrectly computed because \R can also match just one byte.      incorrectly computed because \R can also match just one byte.
505    
506  19. If a pattern containing (*ACCEPT) was studied, the minimum subject length  19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
507      was incorrectly computed.      was incorrectly computed.
508    
509  20. If /S is present twice on a test pattern in pcretest input, it *disables*  20. If /S is present twice on a test pattern in pcretest input, it now
510      studying, thereby overriding the use of -s on the command line. This is      *disables* studying, thereby overriding the use of -s on the command line
511      necessary for one or two tests to keep the output identical in both cases.      (see 14 above). This is necessary for one or two tests to keep the output
512        identical in both cases.
513    
514  21. When (*ACCEPT) was used in an assertion that matched an empty string and  21. When (*ACCEPT) was used in an assertion that matched an empty string and
515      PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.      PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
516    
517  22. When an atomic group that contained a capturing parenthesis was  22. When an atomic group that contained a capturing parenthesis was
518      successfully matched, but the branch in which it appeared failed, the      successfully matched, but the branch in which it appeared failed, the
519      capturing was not being forgotten if a higher numbered group was later      capturing was not being forgotten if a higher numbered group was later
520      captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing      captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
521      group 1 to "a", when in fact it should be unset. This applied to multi-      group 1 to "a", when in fact it should be unset. This applied to multi-
522      branched capturing and non-capturing groups, repeated or not, and also to      branched capturing and non-capturing groups, repeated or not, and also to
523      positive assertions (capturing in negative assertions is not well defined      positive assertions (capturing in negative assertions does not happen
524      in PCRE) and also to nested atomic groups.      in PCRE) and also to nested atomic groups.
525    
526  23. Add the ++ qualifier feature to pcretest, to show the remainder of the  23. Add the ++ qualifier feature to pcretest, to show the remainder of the
527      subject after a captured substring (to make it easier to tell which of a      subject after a captured substring, to make it easier to tell which of a
528      number of identical substrings has been captured).      number of identical substrings has been captured.
529    
530  24. The way atomic groups are processed by pcre_exec() has been changed so that  24. The way atomic groups are processed by pcre_exec() has been changed so that
531      if they are repeated, backtracking one repetition now resets captured      if they are repeated, backtracking one repetition now resets captured
532      values correctly. For example, if ((?>(a+)b)+aabab) is matched against      values correctly. For example, if ((?>(a+)b)+aabab) is matched against
533      "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as      "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
534      "aaa". Previously, it would have been "a". As part of this code      "aaa". Previously, it would have been "a". As part of this code
535      refactoring, the way recursive calls are handled has also been changed.      refactoring, the way recursive calls are handled has also been changed.
536    
537  24. If an assertion condition captured any substrings, they were not passed  25. If an assertion condition captured any substrings, they were not passed
538      back unless some other capturing happened later. For example, if      back unless some other capturing happened later. For example, if
539      (?(?=(a))a) was matched against "a", no capturing was returned.      (?(?=(a))a) was matched against "a", no capturing was returned.
540    
541  25. When studying a pattern that contained subroutine calls or assertions,  26. When studying a pattern that contained subroutine calls or assertions,
542      the code for finding the minimum length of a possible match was handling      the code for finding the minimum length of a possible match was handling
543      direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where      direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
544      group 1 called group 2 while simultaneously a separate group 2 called group      group 1 called group 2 while simultaneously a separate group 2 called group
545      1). A stack overflow occurred in this case. I have fixed this by limiting      1). A stack overflow occurred in this case. I have fixed this by limiting
546      the recursion depth to 10.      the recursion depth to 10.
547    
548  26. Updated RunTest.bat in the distribution to the version supplied by Tom  27. Updated RunTest.bat in the distribution to the version supplied by Tom
549      Fortmann. This supports explicit test numbers on the command line, and has      Fortmann. This supports explicit test numbers on the command line, and has
550      argument validation and error reporting.      argument validation and error reporting.
551    
552  27. An instance of \X with an unlimited repeat could fail if at any point the  28. An instance of \X with an unlimited repeat could fail if at any point the
553      first character it looked at was a mark character.      first character it looked at was a mark character.
554    
555  28. Some minor code refactoring concerning Unicode properties and scripts  29. Some minor code refactoring concerning Unicode properties and scripts
556      should reduce the stack requirement of match() slightly.      should reduce the stack requirement of match() slightly.
557    
558  29. Added the '=' option to pcretest to check the setting of unused capturing  30. Added the '=' option to pcretest to check the setting of unused capturing
559      slots at the end of the pattern, which are documented as being -1, but are      slots at the end of the pattern, which are documented as being -1, but are
560      not included in the return count.      not included in the return count.
561    
562  30. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE  31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
563      compiled something random. Now it gives a compile-time error (as does      compiled something random. Now it gives a compile-time error (as does
564      Perl).      Perl).
565    
566  31. A *MARK encountered during the processing of a positive assertion is now  32. A *MARK encountered during the processing of a positive assertion is now
567      recorded and passed back (compatible with Perl).      recorded and passed back (compatible with Perl).
568    
569  32. If --only-matching or --colour was set on a pcregrep call whose pattern  33. If --only-matching or --colour was set on a pcregrep call whose pattern
570      had alternative anchored branches, the search for a second match in a line      had alternative anchored branches, the search for a second match in a line
571      was done as if at the line start. Thus, for example, /^01|^02/ incorrectly      was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
572      matched the line "0102" twice. The same bug affected patterns that started      matched the line "0102" twice. The same bug affected patterns that started
573      with a backwards assertion. For example /\b01|\b02/ also matched "0102"      with a backwards assertion. For example /\b01|\b02/ also matched "0102"
574      twice.      twice.
575    
576  33. Previously, PCRE did not allow quantification of assertions. However, Perl  34. Previously, PCRE did not allow quantification of assertions. However, Perl
577      does, and because of capturing effects, quantifying parenthesized      does, and because of capturing effects, quantifying parenthesized
578      assertions may at times be useful. Quantifiers are now allowed for      assertions may at times be useful. Quantifiers are now allowed for
579      parenthesized assertions.      parenthesized assertions.
580    
581    35. A minor code tidy in pcre_compile() when checking options for \R usage.
582    
583    36. \g was being checked for fancy things in a character class, when it should
584        just be a literal "g".
585    
586    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
587        appearance of a nested POSIX class supersedes an apparent external class.
588        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
589        unescaped square brackets may also appear as part of class names. For
590        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
591        more like Perl. (But see 8.20/1 above.)
592    
593    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
594        was because it thought it was \N{name}, which is not supported).
595    
596    39. Add minix to OS list not supporting the -S option in pcretest.
597    
598    40. PCRE tries to detect cases of infinite recursion at compile time, but it
599        cannot analyze patterns in sufficient detail to catch mutual recursions
600        such as ((?1))((?2)). There is now a runtime test that gives an error if a
601        subgroup is called recursively as a subpattern for a second time at the
602        same position in the subject string. In previous releases this might have
603        been caught by the recursion limit, or it might have run out of stack.
604    
605    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
606        happen only once. PCRE was, however incorrectly giving a compile time error
607        "recursive call could loop indefinitely" because it cannot analyze the
608        pattern in sufficient detail. The compile time test no longer happens when
609        PCRE is compiling a conditional subpattern, but actual runaway loops are
610        now caught at runtime (see 40 above).
611    
612    42. It seems that Perl allows any characters other than a closing parenthesis
613        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
614        has been changed to be the same.
615    
616    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
617        as not to get warnings when autogen.sh is called. Also changed
618        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
619    
620    44. To help people who use pcregrep to scan files containing exceedingly long
621        lines, the following changes have been made:
622    
623        (a) The default value of the buffer size parameter has been increased from
624            8K to 20K. (The actual buffer used is three times this size.)
625    
626        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
627            PCRE is built.
628    
629        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
630            to be set at run time.
631    
632        (d) Numerical values in pcregrep options can be followed by K or M, for
633            example --buffer-size=50K.
634    
635        (e) If a line being scanned overflows pcregrep's buffer, an error is now
636            given and the return code is set to 2.
637    
638    45. Add a pointer to the latest mark to the callout data block.
639    
640    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
641        partial match of an empty string instead of no match. This was specific to
642        the use of ".".
643    
644    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
645        complete match instead of a partial match. This bug was dependent on both
646        the PCRE_UTF8 and PCRE_DOTALL options being set.
647    
648    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
649        starting byte set, because \b was not being ignored.
650    
651    
652  Version 8.12 15-Jan-2011  Version 8.12 15-Jan-2011
653  ------------------------  ------------------------

Legend:
Removed from v.637  
changed lines
  Added in v.963

  ViewVC Help
Powered by ViewVC 1.1.5