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revision 76 by nigel, Sat Feb 24 21:40:37 2007 UTC revision 77 by nigel, Sat Feb 24 21:40:45 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    Version 6.0 07-Jun-05
5    ---------------------
6    
7     1. Some minor internal re-organization to help with my DFA experiments.
8    
9     2. Some missing #ifdef SUPPORT_UCP conditionals in pcretest and printint that
10        didn't matter for the library itself when fully configured, but did matter
11        when compiling without UCP support, or within Exim, where the ucp files are
12        not imported.
13    
14     3. Refactoring of the library code to split up the various functions into
15        different source modules. The addition of the new DFA matching code (see
16        below) to a single monolithic source would have made it really too
17        unwieldy, quite apart from causing all the code to be include in a
18        statically linked application, when only some functions are used. This is
19        relevant even without the DFA addition now that patterns can be compiled in
20        one application and matched in another.
21    
22        The downside of splitting up is that there have to be some external
23        functions and data tables that are used internally in different modules of
24        the library but which are not part of the API. These have all had their
25        names changed to start with "_pcre_" so that they are unlikely to clash
26        with other external names.
27    
28     4. Added an alternate matching function, pcre_dfa_exec(), which matches using
29        a different (DFA) algorithm. Although it is slower than the original
30        function, it does have some advantages for certain types of matching
31        problem.
32    
33     5. Upgrades to pcretest in order to test the features of pcre_dfa_exec(),
34        including restarting after a partial match.
35    
36     6. A patch for pcregrep that defines INVALID_FILE_ATTRIBUTES if it is not
37        defined when compiling for Windows was sent to me. I have put it into the
38        code, though I have no means of testing or verifying it.
39    
40     7. Added the pcre_refcount() auxiliary function.
41    
42     8. Added the PCRE_FIRSTLINE option. This constrains an unanchored pattern to
43        match before or at the first newline in the subject string. In pcretest,
44        the /f option on a pattern can be used to set this.
45    
46     9. A repeated \w when used in UTF-8 mode with characters greater than 256
47        would behave wrongly. This has been present in PCRE since release 4.0.
48    
49    10. A number of changes to the pcregrep command:
50    
51        (a) Refactored how -x works; insert ^(...)$ instead of setting
52            PCRE_ANCHORED and checking the length, in preparation for adding
53            something similar for -w.
54    
55        (b) Added the -w (match as a word) option.
56    
57        (c) Refactored the way lines are read and buffered so as to have more
58            than one at a time available.
59    
60        (d) Implemented a pcregrep test script.
61    
62        (e) Added the -M (multiline match) option. This allows patterns to match
63            over several lines of the subject. The buffering ensures that at least
64            8K, or the rest of the document (whichever is the shorter) is available
65            for matching (and similarly the previous 8K for lookbehind assertions).
66    
67        (f) Changed the --help output so that it now says
68    
69              -w, --word-regex(p)
70    
71            instead of two lines, one with "regex" and the other with "regexp"
72            because that confused at least one person since the short forms are the
73            same. (This required a bit of code, as the output is generated
74            automatically from a table. It wasn't just a text change.)
75    
76        (g) -- can be used to terminate pcregrep options if the next thing isn't an
77            option but starts with a hyphen. Could be a pattern or a path name
78            starting with a hyphen, for instance.
79    
80        (h) "-" can be given as a file name to represent stdin.
81    
82        (i) When file names are being printed, "(standard input)" is used for
83            the standard input, for compatibility with GNU grep. Previously
84            "<stdin>" was used.
85    
86        (j) The option --label=xxx can be used to supply a name to be used for
87            stdin when file names are being printed. There is no short form.
88    
89        (k) Re-factored the options decoding logic because we are going to add
90            two more options that take data. Such options can now be given in four
91            different ways, e.g. "-fname", "-f name", "--file=name", "--file name".
92    
93        (l) Added the -A, -B, and -C options for requesting that lines of context
94            around matches be printed.
95    
96        (m) Added the -L option to print the names of files that do not contain
97            any matching lines, that is, the complement of -l.
98    
99        (n) The return code is 2 if any file cannot be opened, but pcregrep does
100            continue to scan other files.
101    
102        (o) The -s option was incorrectly implemented. For compatibility with other
103            greps, it now suppresses the error message for a non-existent or non-
104            accessible file (but not the return code). There is a new option called
105            -q that suppresses the output of matching lines, which was what -s was
106            previously doing.
107    
108        (p) Added --include and --exclude options to specify files for inclusion
109            and exclusion when recursing.
110    
111    11. The Makefile was not using the Autoconf-supported LDFLAGS macro properly.
112        Hopefully, it now does.
113    
114    12. Missing cast in pcre_study().
115    
116    13. Added an "uninstall" target to the makefile.
117    
118    14. Replaced "extern" in the function prototypes in Makefile.in with
119        "PCRE_DATA_SCOPE", which defaults to 'extern' or 'extern "C"' in the Unix
120        world, but is set differently for Windows.
121    
122    15. Added a second compiling function called pcre_compile2(). The only
123        difference is that it has an extra argument, which is a pointer to an
124        integer error code. When there is a compile-time failure, this is set
125        non-zero, in addition to the error test pointer being set to point to an
126        error message. The new argument may be NULL if no error number is required
127        (but then you may as well call pcre_compile(), which is now just a
128        wrapper). This facility is provided because some applications need a
129        numeric error indication, but it has also enabled me to tidy up the way
130        compile-time errors are handled in the POSIX wrapper.
131    
132    16. Added VPATH=.libs to the makefile; this should help when building with one
133        prefix path and installing with another. (Or so I'm told by someone who
134        knows more about this stuff than I do.)
135    
136    17. Added a new option, REG_DOTALL, to the POSIX function regcomp(). This
137        passes PCRE_DOTALL to the pcre_compile() function, making the "." character
138        match everything, including newlines. This is not POSIX-compatible, but
139        somebody wanted the feature. From pcretest it can be activated by using
140        both the P and the s flags.
141    
142    18. AC_PROG_LIBTOOL appeared twice in Makefile.in. Removed one.
143    
144    19. libpcre.pc was being incorrectly installed as executable.
145    
146    20. A couple of places in pcretest check for end-of-line by looking for '\n';
147        it now also looks for '\r' so that it will work unmodified on Windows.
148    
149    21. Added Google's contributed C++ wrapper to the distribution.
150    
151    22. Added some untidy missing memory free() calls in pcretest, to keep
152        Electric Fence happy when testing.
153    
154    
155    
156  Version 5.0 13-Sep-04  Version 5.0 13-Sep-04
157  ---------------------  ---------------------
158    

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