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revision 127 by ph10, Mon Mar 19 11:44:45 2007 UTC revision 291 by ph10, Wed Dec 26 18:46:46 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 12-Mar-07  Version 7.5 23-Dec-07
5    ---------------------
6    
7    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
8        values in parens when parsing an RE using the C++ wrapper."
9    
10    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
11        Characters greater than 255 were excluded from the class instead of being
12        included.
13    
14    3.  The same bug as (2) above applied to negated POSIX classes such as
15        [:^space:].
16    
17    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
18        defined or documented. It seems to have been a typo for PCRE_STATIC, so
19        I have changed it.
20    
21    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
22        first named subpattern) and a construct such as (?&a) would reference the
23        first named subpattern whose name started with "a" (in other words, the
24        length check was missing). Both these problems are fixed. "Subpattern name
25        expected" is now given for (?&) (a zero-length name), and this patch also
26        makes it give the same error for \k'' (previously it complained that that
27        was a reference to a non-existent subpattern).
28    
29    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
30        this is right because (?- can be followed by option settings as well as by
31        digits. I have, however, made the messages clearer.
32    
33    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
34        than the number used in the conditional) now cause a compile-time error.
35        This is actually not compatible with Perl, which accepts such patterns, but
36        treats the conditional as always being FALSE (as PCRE used to), but it
37        seems to me that giving a diagnostic is better.
38    
39    8.  Change "alphameric" to the more common word "alphanumeric" in comments
40        and messages.
41    
42    9.  Fix two occurrences of "backslash" in comments that should have been
43        "backspace".
44    
45    10. Remove two redundant lines of code that can never be obeyed (their function
46        was moved elsewhere).
47    
48    11. The program that makes PCRE's Unicode character property table had a bug
49        which caused it to generate incorrect table entries for sequences of
50        characters that have the same character type, but are in different scripts.
51        It amalgamated them into a single range, with the script of the first of
52        them. In other words, some characters were in the wrong script. There were
53        thirteen such cases, affecting characters in the following ranges:
54    
55          U+002b0 - U+002c1
56          U+0060c - U+0060d
57          U+0061e - U+00612
58          U+0064b - U+0065e
59          U+0074d - U+0076d
60          U+01800 - U+01805
61          U+01d00 - U+01d77
62          U+01d9b - U+01dbf
63          U+0200b - U+0200f
64          U+030fc - U+030fe
65          U+03260 - U+0327f
66          U+0fb46 - U+0fbb1
67          U+10450 - U+1049d
68    
69    12. The -o option (show only the matching part of a line) for pcregrep was not
70        compatible with GNU grep in that, if there was more than one match in a
71        line, it showed only the first of them. It now behaves in the same way as
72        GNU grep.
73    
74    13. If the -o and -v options were combined for pcregrep, it printed a blank
75        line for every non-matching line. GNU grep prints nothing, and pcregrep now
76        does the same. The return code can be used to tell if there were any
77        non-matching lines.
78    
79    14. Added --file-offsets and --line-offsets to pcregrep.
80    
81    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
82        infinitely looping recursion. The bug was that positive lookaheads were not
83        being skipped when checking for a possible empty match (negative lookaheads
84        and both kinds of lookbehind were skipped).
85    
86    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
87        inclusion of <windows.h> to before rather than after the definition of
88        INVALID_FILE_ATTRIBUTES (patch from David Byron).
89    
90    17. Specifying a possessive quantifier with a specific limit for a Unicode
91        character property caused pcre_compile() to compile bad code, which led at
92        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
93        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
94        caused the error; without that there was no problem.
95    
96    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
97    
98    19. Added --enable-pcretest-libreadline.
99    
100    20. In pcrecpp.cc, the variable 'count' was incremented twice in
101        RE::GlobalReplace(). As a result, the number of replacements returned was
102        double what it should be. I have removed one of the increments.
103    
104    21. Several CMake things:
105    
106        (1) Arranged that, when cmake is used on Unix, the libraries end up with
107            the names libpcre and libpcreposix.
108    
109        (2) Arranged for pcretest and pcregrep to link with the newly-built
110            libraries, not previously installed ones.
111    
112        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
113    
114    
115    Version 7.4 21-Sep-07
116    ---------------------
117    
118    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
119        means that a class such as [\s] counted as "explicit reference to CR or
120        LF". That isn't really right - the whole point of the change was to try to
121        help when there was an actual mention of one of the two characters. So now
122        the change happens only if \r or \n (or a literal CR or LF) character is
123        encountered.
124    
125    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
126        of both had grown to the point where there were only 3 bits left.
127        Fortunately, there was spare space in the data structure, and so I have
128        moved the internal flags into a new 16-bit field to free up more option
129        bits.
130    
131    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
132        but did not set the internal JCHANGED flag - either of these is enough to
133        control the way the "get" function works - but the PCRE_INFO_JCHANGED
134        facility is supposed to tell if (?J) was ever used, so now (?J) at the
135        start sets both bits.
136    
137    4.  Added options (at build time, compile time, exec time) to change \R from
138        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
139    
140    5.  doc/pcresyntax.html was missing from the distribution.
141    
142    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
143        compatibility, even though it is no longer used.
144    
145    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
146        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
147        windows.h file is present (where different names are used). [This was
148        reversed later after testing - see 16 below.]
149    
150    8.  Changed all #include <config.h> to #include "config.h". There were also
151        some further <pcre.h> cases that I changed to "pcre.h".
152    
153    9.  When pcregrep was used with the --colour option, it missed the line ending
154        sequence off the lines that it output.
155    
156    10. It was pointed out to me that arrays of string pointers cause lots of
157        relocations when a shared library is dynamically loaded. A technique of
158        using a single long string with a table of offsets can drastically reduce
159        these. I have refactored PCRE in four places to do this. The result is
160        dramatic:
161    
162          Originally:                          290
163          After changing UCP table:            187
164          After changing error message table:   43
165          After changing table of "verbs"       36
166          After changing table of Posix names   22
167    
168        Thanks to the folks working on Gregex for glib for this insight.
169    
170    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
171        unicode-properties was also set.
172    
173    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
174    
175    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
176        checked only for CRLF.
177    
178    14. Added casts to pcretest.c to avoid compiler warnings.
179    
180    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
181    
182    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
183        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
184        entirely. This removes changes made in 7 above.
185    
186    17. The CMake files have been updated, and there is now more information about
187        building with CMake in the NON-UNIX-USE document.
188    
189    
190    Version 7.3 28-Aug-07
191    ---------------------
192    
193     1. In the rejigging of the build system that eventually resulted in 7.1, the
194        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
195        brackets there is not right, since it causes compilers to look for an
196        installed pcre.h, not the version that is in the source that is being
197        compiled (which of course may be different). I have changed it back to:
198    
199          #include "pcre.h"
200    
201        I have a vague recollection that the change was concerned with compiling in
202        different directories, but in the new build system, that is taken care of
203        by the VPATH setting the Makefile.
204    
205     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
206        when the subject happened to end in the byte 0x85 (e.g. if the last
207        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
208        characters but of course it shouldn't be taken as a newline when it is part
209        of another character. The bug was that, for an unlimited repeat of . in
210        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
211        characters when looking for a newline.
212    
213     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
214    
215     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
216        in debug output.
217    
218     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
219        long printing in the pcrecpp unittest when running under MinGW.
220    
221     6. ESC_K was left out of the EBCDIC table.
222    
223     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
224        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
225        limit also applies to "virtual nesting" when a pattern is recursive, and in
226        this case 1000 isn't so big. I have been able to remove this limit at the
227        expense of backing off one optimization in certain circumstances. Normally,
228        when pcre_exec() would call its internal match() function recursively and
229        immediately return the result unconditionally, it uses a "tail recursion"
230        feature to save stack. However, when a subpattern that can match an empty
231        string has an unlimited repetition quantifier, it no longer makes this
232        optimization. That gives it a stack frame in which to save the data for
233        checking that an empty string has been matched. Previously this was taken
234        from the 1000-entry workspace that had been reserved. So now there is no
235        explicit limit, but more stack is used.
236    
237     8. Applied Daniel's patches to solve problems with the import/export magic
238        syntax that is required for Windows, and which was going wrong for the
239        pcreposix and pcrecpp parts of the library. These were overlooked when this
240        problem was solved for the main library.
241    
242     9. There were some crude static tests to avoid integer overflow when computing
243        the size of patterns that contain repeated groups with explicit upper
244        limits. As the maximum quantifier is 65535, the maximum group length was
245        set at 30,000 so that the product of these two numbers did not overflow a
246        32-bit integer. However, it turns out that people want to use groups that
247        are longer than 30,000 bytes (though not repeat them that many times).
248        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
249        made it possible to implement the integer overflow checks in a much more
250        dynamic way, which I have now done. The artificial limitation on group
251        length has been removed - we now have only the limit on the total length of
252        the compiled pattern, which depends on the LINK_SIZE setting.
253    
254    10. Fixed a bug in the documentation for get/copy named substring when
255        duplicate names are permitted. If none of the named substrings are set, the
256        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
257        empty string.
258    
259    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
260        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
261        because the ] is interpreted as the first data character and the
262        terminating ] is not found. PCRE has been made compatible with Perl in this
263        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
264        cause memory overwriting.
265    
266    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
267        string has been matched (to stop an infinite loop). It was not recognizing
268        a conditional subpattern that could match an empty string if that
269        subpattern was within another subpattern. For example, it looped when
270        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
271        condition was not nested. This bug has been fixed.
272    
273    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
274        past the start of the subject in the presence of bytes with the top bit
275        set, for example "\x8aBCD".
276    
277    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
278        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
279    
280    14. Optimized (?!) to (*FAIL).
281    
282    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
283        This restricts code points to be within the range 0 to 0x10FFFF, excluding
284        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
285        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
286        does: it's just the validity check that is more restrictive.
287    
288    16. Inserted checks for integer overflows during escape sequence (backslash)
289        processing, and also fixed erroneous offset values for syntax errors during
290        backslash processing.
291    
292    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
293        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
294    
295    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
296        caused an overrun.
297    
298    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
299        something other than just ASCII characters) inside a group that had an
300        unlimited repeat caused a loop at compile time (while checking to see
301        whether the group could match an empty string).
302    
303    20. Debugging a pattern containing \p or \P could cause a crash. For example,
304        [\P{Any}] did so. (Error in the code for printing property names.)
305    
306    21. An orphan \E inside a character class could cause a crash.
307    
308    22. A repeated capturing bracket such as (A)? could cause a wild memory
309        reference during compilation.
310    
311    23. There are several functions in pcre_compile() that scan along a compiled
312        expression for various reasons (e.g. to see if it's fixed length for look
313        behind). There were bugs in these functions when a repeated \p or \P was
314        present in the pattern. These operators have additional parameters compared
315        with \d, etc, and these were not being taken into account when moving along
316        the compiled data. Specifically:
317    
318        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
319            length.
320    
321        (b) An item such as \pL+ within a repeated group could cause crashes or
322            loops.
323    
324        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
325            "reference to non-existent subpattern" error.
326    
327        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
328    
329    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
330        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
331    
332    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
333    
334    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
335        character were causing crashes (broken optimization).
336    
337    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
338        \p or \P) caused a compile-time loop.
339    
340    28. More problems have arisen in unanchored patterns when CRLF is a valid line
341        break. For example, the unstudied pattern [\r\n]A does not match the string
342        "\r\nA" because change 7.0/46 below moves the current point on by two
343        characters after failing to match at the start. However, the pattern \nA
344        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
345        the same is true. There doesn't seem any very clean way out of this, but
346        what I have chosen to do makes the common cases work: PCRE now takes note
347        of whether there can be an explicit match for \r or \n anywhere in the
348        pattern, and if so, 7.0/46 no longer applies. As part of this change,
349        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
350        pattern has explicit CR or LF references.
351    
352    29. Added (*CR) etc for changing newline setting at start of pattern.
353    
354    
355    Version 7.2 19-Jun-07
356    ---------------------
357    
358     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
359        which is apparently normally available under Windows.
360    
361     2. Re-jig the pcregrep tests with different newline settings in an attempt
362        to make them independent of the local environment's newline setting.
363    
364     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
365    
366     4. Some of the "internals" tests were previously cut out when the link size
367        was not 2, because the output contained actual offsets. The recent new
368        "Z" feature of pcretest means that these can be cut out, making the tests
369        usable with all link sizes.
370    
371     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
372        stack recursion. This gives a massive performance boost under BSD, but just
373        a small improvement under Linux. However, it saves one field in the frame
374        in all cases.
375    
376     6. Added more features from the forthcoming Perl 5.10:
377    
378        (a) (?-n) (where n is a string of digits) is a relative subroutine or
379            recursion call. It refers to the nth most recently opened parentheses.
380    
381        (b) (?+n) is also a relative subroutine call; it refers to the nth next
382            to be opened parentheses.
383    
384        (c) Conditions that refer to capturing parentheses can be specified
385            relatively, for example, (?(-2)... or (?(+3)...
386    
387        (d) \K resets the start of the current match so that everything before
388            is not part of it.
389    
390        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
391    
392        (f) \g{name} is another synonym - part of Perl 5.10's unification of
393            reference syntax.
394    
395        (g) (?| introduces a group in which the numbering of parentheses in each
396            alternative starts with the same number.
397    
398        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
399    
400     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
401        PCRE_INFO_JCHANGED.
402    
403     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
404        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
405        for detecting groups that can match an empty string.
406    
407     9. A pattern with a very large number of alternatives (more than several
408        hundred) was running out of internal workspace during the pre-compile
409        phase, where pcre_compile() figures out how much memory will be needed. A
410        bit of new cunning has reduced the workspace needed for groups with
411        alternatives. The 1000-alternative test pattern now uses 12 bytes of
412        workspace instead of running out of the 4096 that are available.
413    
414    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
415    
416    11. Applied patch from Google to remove an optimization that didn't quite work.
417        The report of the bug said:
418    
419          pcrecpp::RE("a*").FullMatch("aaa") matches, while
420          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
421          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
422    
423    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
424        it matched the wrong number of bytes.
425    
426    
427    Version 7.1 24-Apr-07
428  ---------------------  ---------------------
429    
430   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
# Line 33  Version 7.1 12-Mar-07 Line 456  Version 7.1 12-Mar-07
456   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
457      Weber: (1) pcre_internal.h was missing some function renames; (2) updated      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
458      makevp.bat for the current PCRE, using the additional files      makevp.bat for the current PCRE, using the additional files
459      makevp-compile.txt, makevp-linklib.txt, and pcregexp.pas.      makevp_c.txt, makevp_l.txt, and pcregexp.pas.
460    
461   6. A Windows user reported a minor discrepancy with test 2, which turned out   6. A Windows user reported a minor discrepancy with test 2, which turned out
462      to be caused by a trailing space on an input line that had got lost in his      to be caused by a trailing space on an input line that had got lost in his
# Line 116  Version 7.1 12-Mar-07 Line 539  Version 7.1 12-Mar-07
539  14. If erroroffset was passed as NULL to pcre_compile, it provoked a  14. If erroroffset was passed as NULL to pcre_compile, it provoked a
540      segmentation fault instead of returning the appropriate error message.      segmentation fault instead of returning the appropriate error message.
541    
542    15. In multiline mode when the newline sequence was set to "any", the pattern
543        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
544        This doesn't seem right; it now treats the CRLF combination as the line
545        ending, and so does not match in that case. It's only a pattern such as ^$
546        that would hit this one: something like ^ABC$ would have failed after \r
547        and then tried again after \r\n.
548    
549    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
550        in an attempt to make files that differ only in their line terminators
551        compare equal. This works on Linux.
552    
553    17. Under certain error circumstances pcregrep might try to free random memory
554        as it exited. This is now fixed, thanks to valgrind.
555    
556    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
557        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
558        was because its rules for how to advance for /g after matching an empty
559        string at the end of a line did not allow for this case. They now check for
560        it specially.
561    
562    20. pcretest is supposed to handle patterns and data of any length, by
563        extending its buffers when necessary. It was getting this wrong when the
564        buffer for a data line had to be extended.
565    
566    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
567        CRLF as a newline sequence.
568    
569    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
570        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
571        I have nevertheless tidied it up.
572    
573    23. Added some casts to kill warnings from HP-UX ia64 compiler.
574    
575    24. Added a man page for pcre-config.
576    
577    
578  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
579  ---------------------  ---------------------

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