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ChangeLog for PCRE |
ChangeLog for PCRE |
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Version 6.0 07-Jun-05 |
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1. Some minor internal re-organization to help with my DFA experiments. |
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2. Some missing #ifdef SUPPORT_UCP conditionals in pcretest and printint that |
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didn't matter for the library itself when fully configured, but did matter |
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when compiling without UCP support, or within Exim, where the ucp files are |
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not imported. |
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3. Refactoring of the library code to split up the various functions into |
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different source modules. The addition of the new DFA matching code (see |
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below) to a single monolithic source would have made it really too |
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unwieldy, quite apart from causing all the code to be include in a |
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statically linked application, when only some functions are used. This is |
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relevant even without the DFA addition now that patterns can be compiled in |
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one application and matched in another. |
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The downside of splitting up is that there have to be some external |
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functions and data tables that are used internally in different modules of |
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the library but which are not part of the API. These have all had their |
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names changed to start with "_pcre_" so that they are unlikely to clash |
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with other external names. |
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4. Added an alternate matching function, pcre_dfa_exec(), which matches using |
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a different (DFA) algorithm. Although it is slower than the original |
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function, it does have some advantages for certain types of matching |
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problem. |
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5. Upgrades to pcretest in order to test the features of pcre_dfa_exec(), |
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including restarting after a partial match. |
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6. A patch for pcregrep that defines INVALID_FILE_ATTRIBUTES if it is not |
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defined when compiling for Windows was sent to me. I have put it into the |
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code, though I have no means of testing or verifying it. |
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7. Added the pcre_refcount() auxiliary function. |
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8. Added the PCRE_FIRSTLINE option. This constrains an unanchored pattern to |
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match before or at the first newline in the subject string. In pcretest, |
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the /f option on a pattern can be used to set this. |
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9. A repeated \w when used in UTF-8 mode with characters greater than 256 |
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would behave wrongly. This has been present in PCRE since release 4.0. |
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10. A number of changes to the pcregrep command: |
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(a) Refactored how -x works; insert ^(...)$ instead of setting |
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PCRE_ANCHORED and checking the length, in preparation for adding |
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something similar for -w. |
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(b) Added the -w (match as a word) option. |
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(c) Refactored the way lines are read and buffered so as to have more |
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than one at a time available. |
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(d) Implemented a pcregrep test script. |
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(e) Added the -M (multiline match) option. This allows patterns to match |
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over several lines of the subject. The buffering ensures that at least |
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8K, or the rest of the document (whichever is the shorter) is available |
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for matching (and similarly the previous 8K for lookbehind assertions). |
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(f) Changed the --help output so that it now says |
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-w, --word-regex(p) |
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instead of two lines, one with "regex" and the other with "regexp" |
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because that confused at least one person since the short forms are the |
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same. (This required a bit of code, as the output is generated |
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automatically from a table. It wasn't just a text change.) |
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(g) -- can be used to terminate pcregrep options if the next thing isn't an |
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option but starts with a hyphen. Could be a pattern or a path name |
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starting with a hyphen, for instance. |
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(h) "-" can be given as a file name to represent stdin. |
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(i) When file names are being printed, "(standard input)" is used for |
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the standard input, for compatibility with GNU grep. Previously |
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"<stdin>" was used. |
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(j) The option --label=xxx can be used to supply a name to be used for |
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stdin when file names are being printed. There is no short form. |
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(k) Re-factored the options decoding logic because we are going to add |
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two more options that take data. Such options can now be given in four |
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different ways, e.g. "-fname", "-f name", "--file=name", "--file name". |
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(l) Added the -A, -B, and -C options for requesting that lines of context |
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around matches be printed. |
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(m) Added the -L option to print the names of files that do not contain |
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any matching lines, that is, the complement of -l. |
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(n) The return code is 2 if any file cannot be opened, but pcregrep does |
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continue to scan other files. |
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(o) The -s option was incorrectly implemented. For compatibility with other |
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greps, it now suppresses the error message for a non-existent or non- |
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accessible file (but not the return code). There is a new option called |
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-q that suppresses the output of matching lines, which was what -s was |
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previously doing. |
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(p) Added --include and --exclude options to specify files for inclusion |
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and exclusion when recursing. |
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11. The Makefile was not using the Autoconf-supported LDFLAGS macro properly. |
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Hopefully, it now does. |
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12. Missing cast in pcre_study(). |
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13. Added an "uninstall" target to the makefile. |
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14. Replaced "extern" in the function prototypes in Makefile.in with |
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"PCRE_DATA_SCOPE", which defaults to 'extern' or 'extern "C"' in the Unix |
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world, but is set differently for Windows. |
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15. Added a second compiling function called pcre_compile2(). The only |
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difference is that it has an extra argument, which is a pointer to an |
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integer error code. When there is a compile-time failure, this is set |
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non-zero, in addition to the error test pointer being set to point to an |
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error message. The new argument may be NULL if no error number is required |
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(but then you may as well call pcre_compile(), which is now just a |
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wrapper). This facility is provided because some applications need a |
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numeric error indication, but it has also enabled me to tidy up the way |
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compile-time errors are handled in the POSIX wrapper. |
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16. Added VPATH=.libs to the makefile; this should help when building with one |
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prefix path and installing with another. (Or so I'm told by someone who |
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knows more about this stuff than I do.) |
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17. Added a new option, REG_DOTALL, to the POSIX function regcomp(). This |
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passes PCRE_DOTALL to the pcre_compile() function, making the "." character |
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match everything, including newlines. This is not POSIX-compatible, but |
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somebody wanted the feature. From pcretest it can be activated by using |
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both the P and the s flags. |
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18. AC_PROG_LIBTOOL appeared twice in Makefile.in. Removed one. |
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19. libpcre.pc was being incorrectly installed as executable. |
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20. A couple of places in pcretest check for end-of-line by looking for '\n'; |
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it now also looks for '\r' so that it will work unmodified on Windows. |
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21. Added Google's contributed C++ wrapper to the distribution. |
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22. Added some untidy missing memory free() calls in pcretest, to keep |
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Electric Fence happy when testing. |
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Version 5.0 13-Sep-04 |
Version 5.0 13-Sep-04 |
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--------------------- |
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