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revision 206 by ph10, Fri Aug 3 14:53:04 2007 UTC revision 261 by ph10, Fri Sep 21 08:37:48 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.3 05-Jul-07  Version 7.4 21-Sep-07
5    ---------------------
6    
7    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
8        means that a class such as [\s] counted as "explicit reference to CR or
9        LF". That isn't really right - the whole point of the change was to try to
10        help when there was an actual mention of one of the two characters. So now
11        the change happens only if \r or \n (or a literal CR or LF) character is
12        encountered.
13    
14    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
15        of both had grown to the point where there were only 3 bits left.
16        Fortunately, there was spare space in the data structure, and so I have
17        moved the internal flags into a new 16-bit field to free up more option
18        bits.
19    
20    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
21        but did not set the internal JCHANGED flag - either of these is enough to
22        control the way the "get" function works - but the PCRE_INFO_JCHANGED
23        facility is supposed to tell if (?J) was ever used, so now (?J) at the
24        start sets both bits.
25    
26    4.  Added options (at build time, compile time, exec time) to change \R from
27        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
28    
29    5.  doc/pcresyntax.html was missing from the distribution.
30    
31    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
32        compatibility, even though it is no longer used.
33    
34    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
35        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
36        windows.h file is present (where different names are used). [This was
37        reversed later after testing - see 16 below.]
38    
39    8.  Changed all #include <config.h> to #include "config.h". There were also
40        some further <pcre.h> cases that I changed to "pcre.h".
41    
42    9.  When pcregrep was used with the --colour option, it missed the line ending
43        sequence off the lines that it output.
44    
45    10. It was pointed out to me that arrays of string pointers cause lots of
46        relocations when a shared library is dynamically loaded. A technique of
47        using a single long string with a table of offsets can drastically reduce
48        these. I have refactored PCRE in four places to do this. The result is
49        dramatic:
50    
51          Originally:                          290
52          After changing UCP table:            187
53          After changing error message table:   43
54          After changing table of "verbs"       36
55          After changing table of Posix names   22
56    
57        Thanks to the folks working on Gregex for glib for this insight.
58    
59    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
60        unicode-properties was also set.
61    
62    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
63    
64    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
65        checked only for CRLF.
66    
67    14. Added casts to pcretest.c to avoid compiler warnings.
68    
69    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
70    
71    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
72        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
73        entirely. This removes changes made in 7 above.
74    
75    17. The CMake files have been updated, and there is now more information about
76        building with CMake in the NON-UNIX-USE document.
77    
78    
79    Version 7.3 28-Aug-07
80  ---------------------  ---------------------
81    
82   1. In the rejigging of the build system that eventually resulted in 7.1, the   1. In the rejigging of the build system that eventually resulted in 7.1, the
# Line 64  Version 7.3 05-Jul-07 Line 139  Version 7.3 05-Jul-07
139      dynamic way, which I have now done. The artificial limitation on group      dynamic way, which I have now done. The artificial limitation on group
140      length has been removed - we now have only the limit on the total length of      length has been removed - we now have only the limit on the total length of
141      the compiled pattern, which depends on the LINK_SIZE setting.      the compiled pattern, which depends on the LINK_SIZE setting.
142    
143  10. Fixed a bug in the documentation for get/copy named substring when  10. Fixed a bug in the documentation for get/copy named substring when
144      duplicate names are permitted. If none of the named substrings are set, the      duplicate names are permitted. If none of the named substrings are set, the
145      functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an      functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
146      empty string.      empty string.
147    
148  11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E  11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
149      instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,      instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
150      because the ] is interpreted as the first data character and the      because the ] is interpreted as the first data character and the
151      terminating ] is not found. PCRE has been made compatible with Perl in this      terminating ] is not found. PCRE has been made compatible with Perl in this
152      regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could      regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
153      cause memory overwriting.      cause memory overwriting.
154    
155  10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty  10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
156      string has been matched (to stop an infinite loop). It was not recognizing      string has been matched (to stop an infinite loop). It was not recognizing
157      a conditional subpattern that could match an empty string if that      a conditional subpattern that could match an empty string if that
158      subpattern was within another subpattern. For example, it looped when      subpattern was within another subpattern. For example, it looped when
159      trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the      trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
160      condition was not nested. This bug has been fixed.      condition was not nested. This bug has been fixed.
161    
162    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
163        past the start of the subject in the presence of bytes with the top bit
164        set, for example "\x8aBCD".
165    
166    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
167        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
168    
169    14. Optimized (?!) to (*FAIL).
170    
171    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
172        This restricts code points to be within the range 0 to 0x10FFFF, excluding
173        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
174        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
175        does: it's just the validity check that is more restrictive.
176    
177    16. Inserted checks for integer overflows during escape sequence (backslash)
178        processing, and also fixed erroneous offset values for syntax errors during
179        backslash processing.
180    
181    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
182        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
183    
184    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
185        caused an overrun.
186    
187    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
188        something other than just ASCII characters) inside a group that had an
189        unlimited repeat caused a loop at compile time (while checking to see
190        whether the group could match an empty string).
191    
192    20. Debugging a pattern containing \p or \P could cause a crash. For example,
193        [\P{Any}] did so. (Error in the code for printing property names.)
194    
195    21. An orphan \E inside a character class could cause a crash.
196    
197    22. A repeated capturing bracket such as (A)? could cause a wild memory
198        reference during compilation.
199    
200    23. There are several functions in pcre_compile() that scan along a compiled
201        expression for various reasons (e.g. to see if it's fixed length for look
202        behind). There were bugs in these functions when a repeated \p or \P was
203        present in the pattern. These operators have additional parameters compared
204        with \d, etc, and these were not being taken into account when moving along
205        the compiled data. Specifically:
206    
207        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
208            length.
209    
210        (b) An item such as \pL+ within a repeated group could cause crashes or
211            loops.
212    
213        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
214            "reference to non-existent subpattern" error.
215    
216        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
217    
218    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
219        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
220    
221    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
222    
223    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
224        character were causing crashes (broken optimization).
225    
226    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
227        \p or \P) caused a compile-time loop.
228    
229    28. More problems have arisen in unanchored patterns when CRLF is a valid line
230        break. For example, the unstudied pattern [\r\n]A does not match the string
231        "\r\nA" because change 7.0/46 below moves the current point on by two
232        characters after failing to match at the start. However, the pattern \nA
233        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
234        the same is true. There doesn't seem any very clean way out of this, but
235        what I have chosen to do makes the common cases work: PCRE now takes note
236        of whether there can be an explicit match for \r or \n anywhere in the
237        pattern, and if so, 7.0/46 no longer applies. As part of this change,
238        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
239        pattern has explicit CR or LF references.
240    
241    29. Added (*CR) etc for changing newline setting at start of pattern.
242    
243    
244  Version 7.2 19-Jun-07  Version 7.2 19-Jun-07
245  ---------------------  ---------------------

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