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revision 127 by ph10, Mon Mar 19 11:44:45 2007 UTC revision 128 by ph10, Tue Mar 20 11:46:50 2007 UTC
# Line 30  The contents of this README file are: Line 30  The contents of this README file are:
30  The PCRE APIs  The PCRE APIs
31  -------------  -------------
32    
33  PCRE is written in C, and it has its own API. The distribution now includes a  PCRE is written in C, and it has its own API. The distribution also includes a
34  set of C++ wrapper functions, courtesy of Google Inc. (see the pcrecpp man page  set of C++ wrapper functions (see the pcrecpp man page for details), courtesy
35  for details).  of Google Inc.
36    
37  Also included in the distribution are a set of C wrapper functions that are  In addition, there is a set of C wrapper functions that are based on the POSIX
38  based on the POSIX API. These end up in the library called libpcreposix. Note  regular expression API (see the pcreposix man page). These end up in the
39  that this just provides a POSIX calling interface to PCRE; the regular  library called libpcreposix. Note that this just provides a POSIX calling
40  expressions themselves still follow Perl syntax and semantics. The POSIX API is  interface to PCRE; the regular expressions themselves still follow Perl syntax
41  restricted, and does not give full access to all of PCRE's facilities.  and semantics. The POSIX API is restricted, and does not give full access to
42    all of PCRE's facilities.
43    
44  The header file for the POSIX-style functions is called pcreposix.h. The  The header file for the POSIX-style functions is called pcreposix.h. The
45  official POSIX name is regex.h, but I did not want to risk possible problems  official POSIX name is regex.h, but I did not want to risk possible problems
# Line 91  You can find contributions from PCRE use Line 92  You can find contributions from PCRE use
92    
93  There is a README file giving brief descriptions of what they are. Some are  There is a README file giving brief descriptions of what they are. Some are
94  complete in themselves; others are pointers to URLs containing relevant files.  complete in themselves; others are pointers to URLs containing relevant files.
95  Some of this material is likely to be well out-of-date. In particular, several  Some of this material is likely to be well out-of-date. Several of the earlier
96  of the contributions provide support for compiling PCRE on various flavours of  contributions provided support for compiling PCRE on various flavours of
97  Windows (I myself do not use Windows), but nowadays there is more Windows  Windows (I myself do not use Windows). Nowadays there is more Windows support
98  support in the standard distribution.  in the standard distribution, so these contibutions have been archived.
99    
100    
101  Building PCRE on non-Unix systems  Building PCRE on non-Unix systems
# Line 147  library. You can read more about them in Line 148  library. You can read more about them in
148    
149  . If you want to suppress the building of the C++ wrapper library, you can add  . If you want to suppress the building of the C++ wrapper library, you can add
150    --disable-cpp to the "configure" command. Otherwise, when "configure" is run,    --disable-cpp to the "configure" command. Otherwise, when "configure" is run,
151    will try to find a C++ compiler and C++ header files, and if it succeeds, it    it will try to find a C++ compiler and C++ header files, and if it succeeds,
152    will try to build the C++ wrapper.    it will try to build the C++ wrapper.
153    
154  . If you want to make use of the support for UTF-8 character strings in PCRE,  . If you want to make use of the support for UTF-8 character strings in PCRE,
155    you must add --enable-utf8 to the "configure" command. Without it, the code    you must add --enable-utf8 to the "configure" command. Without it, the code
# Line 178  library. You can read more about them in Line 179  library. You can read more about them in
179    
180  . When called via the POSIX interface, PCRE uses malloc() to get additional  . When called via the POSIX interface, PCRE uses malloc() to get additional
181    storage for processing capturing parentheses if there are more than 10 of    storage for processing capturing parentheses if there are more than 10 of
182    them. You can increase this threshold by setting, for example,    them in a pattern. You can increase this threshold by setting, for example,
183    
184    --with-posix-malloc-threshold=20    --with-posix-malloc-threshold=20
185    
# Line 207  library. You can read more about them in Line 208  library. You can read more about them in
208  . The default maximum compiled pattern size is around 64K. You can increase  . The default maximum compiled pattern size is around 64K. You can increase
209    this by adding --with-link-size=3 to the "configure" command. You can    this by adding --with-link-size=3 to the "configure" command. You can
210    increase it even more by setting --with-link-size=4, but this is unlikely    increase it even more by setting --with-link-size=4, but this is unlikely
211    ever to be necessary.    ever to be necessary. Increasing the internal link size will reduce
212      performance.
213    
214  . You can build PCRE so that its internal match() function that is called from  . You can build PCRE so that its internal match() function that is called from
215    pcre_exec() does not call itself recursively. Instead, it uses memory blocks    pcre_exec() does not call itself recursively. Instead, it uses memory blocks
# Line 223  library. You can read more about them in Line 225  library. You can read more about them in
225    use deeply nested recursion. There is a discussion about stack sizes in the    use deeply nested recursion. There is a discussion about stack sizes in the
226    pcrestack man page.    pcrestack man page.
227    
228    . For speed, PCRE uses four tables for manipulating and identifying characters
229      whose code point values are less than 256. By default, it uses a set of
230      tables for ASCII encoding that is part of the distribution. If you specify
231    
232      --enable-rebuild-chartables
233    
234      a program called dftables is compiled and run in the default C locale when
235      you obey "make". It builds a source file called pcre_chartables.c. If you do
236      not specify this option, pcre_chartables.c is created as a copy of
237      pcre_chartables.c.dist. See "Character tables" below for further information.
238    
239    . It is possible to compile PCRE for use on systems that use EBCDIC as their
240      default character code (as opposed to ASCII) by specifying
241    
242      --enable-ebcdic
243    
244      This automatically implies --enable-rebuild-chartables (see above).
245    
246  The "configure" script builds the following files for the basic C library:  The "configure" script builds the following files for the basic C library:
247    
248  . Makefile is the makefile that builds the library  . Makefile is the makefile that builds the library
# Line 371  Cross-compiling on Unix-like systems Line 391  Cross-compiling on Unix-like systems
391  ------------------------------------  ------------------------------------
392    
393  You can specify CC and CFLAGS in the normal way to the "configure" command, in  You can specify CC and CFLAGS in the normal way to the "configure" command, in
394  order to cross-compile PCRE for some other host. However, during the building  order to cross-compile PCRE for some other host. However, you should NOT
395  process, the dftables.c source file is compiled *and run* on the local host, in  specify --enable-rebuild-chartables, because if you do, the dftables.c source
396  order to generate the default character tables (the chartables.c file). It  file is compiled and run on the local host, in order to generate the inbuilt
397  therefore needs to be compiled with the local compiler, not the cross compiler.  character tables (the pcre_chartables.c file). This will probably not work,
398  You can do this by specifying CC_FOR_BUILD (and if necessary CFLAGS_FOR_BUILD;  because dftables.c needs to be compiled with the local compiler, not the cross
399  there are also CXX_FOR_BUILD and CXXFLAGS_FOR_BUILD for the C++ wrapper)  compiler.
400  when calling the "configure" command. If they are not specified, they default  
401  to the values of CC and CFLAGS.  When --enable-rebuild-chartables is not specified, pcre_chartables.c is created
402    by making a copy of pcre_chartables.c.dist, which is a default set of tables
403    that assumes ASCII code. Cross-compiling with the default tables should not be
404    a problem.
405    
406    If you need to modify the character tables when cross-compiling, you should
407    move pcre_chartables.c.dist out of the way, then compile dftables.c by hand and
408    run it on the local host to make a new version of pcre_chartables.c.dist.
409    Then when you cross-compile PCRE this new version of the tables will be used.
410    
411    
412  Using HP's ANSI C++ compiler (aCC)  Using HP's ANSI C++ compiler (aCC)
# Line 490  concatenated tables. A call to pcre_make Line 518  concatenated tables. A call to pcre_make
518  of tables in the current locale. If the final argument for pcre_compile() is  of tables in the current locale. If the final argument for pcre_compile() is
519  passed as NULL, a set of default tables that is built into the binary is used.  passed as NULL, a set of default tables that is built into the binary is used.
520    
521  The source file called chartables.c contains the default set of tables. This is  The source file called pcre_chartables.c contains the default set of tables. By
522  not supplied in the distribution, but is built by the program dftables  default, this is created as a copy of pcre_chartables.c.dist, which contains
523  (compiled from dftables.c), which uses the ANSI C character handling functions  tables for ASCII coding. However, if --enable-rebuild-chartables is specified
524  such as isalnum(), isalpha(), isupper(), islower(), etc. to build the table  for ./configure, a different version of pcre_chartables.c is built by the
525  sources. This means that the default C locale which is set for your system will  program dftables (compiled from dftables.c), which uses the ANSI C character
526  control the contents of these default tables. You can change the default tables  handling functions such as isalnum(), isalpha(), isupper(), islower(), etc. to
527  by editing chartables.c and then re-building PCRE. If you do this, you should  build the table sources. This means that the default C locale which is set for
528  take care to ensure that the file does not get automaticaly re-generated.  your system will control the contents of these default tables. You can change
529    the default tables by editing pcre_chartables.c and then re-building PCRE. If
530    you do this, you should take care to ensure that the file does not get
531    automatically re-generated. The best way to do this is to move
532    pcre_chartables.c.dist out of the way and replace it with your customized
533    tables.
534    
535    When the dftables program is run as a result of --enable-rebuild-chartables,
536    it uses the default C locale that is set on your system. It does not pay
537    attention to the LC_xxx environment variables. In other words, it uses the
538    system's default locale rather than whatever the compiling user happens to have
539    set. If you really do want to build a source set of character tables in a
540    locale that is specified by the LC_xxx variables, you can run the dftables
541    program by hand with the -L option. For example:
542    
543      ./dftables -L pcre_chartables.c.special
544    
545  The first two 256-byte tables provide lower casing and case flipping functions,  The first two 256-byte tables provide lower casing and case flipping functions,
546  respectively. The next table consists of three 32-byte bit maps which identify  respectively. The next table consists of three 32-byte bit maps which identify
# Line 526  The distribution should contain the foll Line 569  The distribution should contain the foll
569    
570  (A) Source files of the PCRE library functions and their headers:  (A) Source files of the PCRE library functions and their headers:
571    
572    dftables.c             auxiliary program for building chartables.c    dftables.c              auxiliary program for building pcre_chartables.c
573                                when --enable-rebuild-chartables is specified
574    
575    pcreposix.c            )    pcre_chartables.c.dist  a default set of character tables that assume ASCII
576    pcre_compile.c         )                              coding; used, unless --enable-rebuild-chartables is
577    pcre_config.c          )                              specified, by copying to pcre_chartables.c
578    pcre_dfa_exec.c        )  
579    pcre_exec.c            )    pcreposix.c             )
580    pcre_fullinfo.c        )    pcre_compile.c          )
581    pcre_get.c             ) sources for the functions in the library,    pcre_config.c           )
582    pcre_globals.c         )   and some internal functions that they use    pcre_dfa_exec.c         )
583    pcre_info.c            )    pcre_exec.c             )
584    pcre_maketables.c      )    pcre_fullinfo.c         )
585    pcre_newline.c         )    pcre_get.c              ) sources for the functions in the library,
586    pcre_ord2utf8.c        )    pcre_globals.c          )   and some internal functions that they use
587    pcre_refcount.c        )    pcre_info.c             )
588    pcre_study.c           )    pcre_maketables.c       )
589    pcre_tables.c          )    pcre_newline.c          )
590    pcre_try_flipped.c     )    pcre_ord2utf8.c         )
591    pcre_ucp_searchfuncs.c )    pcre_refcount.c         )
592    pcre_valid_utf8.c      )    pcre_study.c            )
593    pcre_version.c         )    pcre_tables.c           )
594    pcre_xclass.c          )    pcre_try_flipped.c      )
595    pcre_printint.src      ) debugging function that is #included in pcretest,    pcre_ucp_searchfuncs.c  )
596                           )   and can also be #included in pcre_compile()    pcre_valid_utf8.c       )
597    pcre.h.in              template for pcre.h when built by "configure"    pcre_version.c          )
598    pcreposix.h            header for the external POSIX wrapper API    pcre_xclass.c           )
599    pcre_internal.h        header for internal use    pcre_printint.src       ) debugging function that is #included in pcretest,
600    ucp.h                  ) headers concerned with                            )   and can also be #included in pcre_compile()
601    ucpinternal.h          )   Unicode property handling    pcre.h.in               template for pcre.h when built by "configure"
602    ucptable.h             ) (this one is the data table)    pcreposix.h             header for the external POSIX wrapper API
603      pcre_internal.h         header for internal use
604    config.h.in            template for config.h, which is built by "configure"    ucp.h                   ) headers concerned with
605      ucpinternal.h           )   Unicode property handling
606    pcrecpp.h              public header file for the C++ wrapper    ucptable.h              ) (this one is the data table)
607    pcrecpparg.h.in        template for another C++ header file  
608    pcre_scanner.h         public header file for C++ scanner functions    config.h.in             template for config.h, which is built by "configure"
609    pcrecpp.cc             )  
610    pcre_scanner.cc        ) source for the C++ wrapper library    pcrecpp.h               public header file for the C++ wrapper
611      pcrecpparg.h.in         template for another C++ header file
612    pcre_stringpiece.h.in  template for pcre_stringpiece.h, the header for the    pcre_scanner.h          public header file for C++ scanner functions
613                             C++ stringpiece functions    pcrecpp.cc              )
614    pcre_stringpiece.cc    source for the C++ stringpiece functions    pcre_scanner.cc         ) source for the C++ wrapper library
615    
616      pcre_stringpiece.h.in   template for pcre_stringpiece.h, the header for the
617                                C++ stringpiece functions
618      pcre_stringpiece.cc     source for the C++ stringpiece functions
619    
620  (B) Source files for programs that use PCRE:  (B) Source files for programs that use PCRE:
621    
622    pcredemo.c             simple demonstration of coding calls to PCRE    pcredemo.c              simple demonstration of coding calls to PCRE
623    pcregrep.c             source of a grep utility that uses PCRE    pcregrep.c              source of a grep utility that uses PCRE
624    pcretest.c             comprehensive test program    pcretest.c              comprehensive test program
625    
626  (C) Auxiliary files:  (C) Auxiliary files:
627    
628    132html                script to turn "man" pages into HTML    132html                 script to turn "man" pages into HTML
629    AUTHORS                information about the author of PCRE    AUTHORS                 information about the author of PCRE
630    ChangeLog              log of changes to the code    ChangeLog               log of changes to the code
631    CleanTxt               script to clean nroff output for txt man pages    CleanTxt                script to clean nroff output for txt man pages
632    Detrail                script to remove trailing spaces    Detrail                 script to remove trailing spaces
633    HACKING                some notes about the internals of PCRE    HACKING                 some notes about the internals of PCRE
634    INSTALL                generic installation instructions    INSTALL                 generic installation instructions
635    LICENCE                conditions for the use of PCRE    LICENCE                 conditions for the use of PCRE
636    COPYING                the same, using GNU's standard name    COPYING                 the same, using GNU's standard name
637    Makefile.in            ) template for Unix Makefile, which is built by    Makefile.in             ) template for Unix Makefile, which is built by
638                           )   "configure"                            )   "configure"
639    Makefile.am            ) the automake input that was used to create    Makefile.am             ) the automake input that was used to create
640                           )   Makefile.in                            )   Makefile.in
641    NEWS                   important changes in this release    NEWS                    important changes in this release
642    NON-UNIX-USE           notes on building PCRE on non-Unix systems    NON-UNIX-USE            notes on building PCRE on non-Unix systems
643    PrepareRelease         script to make preparations for "make dist"    PrepareRelease          script to make preparations for "make dist"
644    README                 this file    README                  this file
645    RunTest.in             template for a Unix shell script for running tests    RunTest.in              template for a Unix shell script for running tests
646    RunGrepTest.in         template for a Unix shell script for pcregrep tests    RunGrepTest.in          template for a Unix shell script for pcregrep tests
647    aclocal.m4             m4 macros (generated by "aclocal")    aclocal.m4              m4 macros (generated by "aclocal")
648    config.guess           ) files used by libtool,    config.guess            ) files used by libtool,
649    config.sub             )   used only when building a shared library    config.sub              )   used only when building a shared library
650    configure              a configuring shell script (built by autoconf)    configure               a configuring shell script (built by autoconf)
651    configure.ac           ) the autoconf input that was used to build    configure.ac            ) the autoconf input that was used to build
652                           )   "configure" and config.h                            )   "configure" and config.h
653    depcomp                ) script to find program dependencies, generated by    depcomp                 ) script to find program dependencies, generated by
654                           )   automake                            )   automake
655    doc/*.3                man page sources for the PCRE functions    doc/*.3                 man page sources for the PCRE functions
656    doc/*.1                man page sources for pcregrep and pcretest    doc/*.1                 man page sources for pcregrep and pcretest
657    doc/index.html.src     the base HTML page    doc/index.html.src      the base HTML page
658    doc/html/*             HTML documentation    doc/html/*              HTML documentation
659    doc/pcre.txt           plain text version of the man pages    doc/pcre.txt            plain text version of the man pages
660    doc/pcretest.txt       plain text documentation of test program    doc/pcretest.txt        plain text documentation of test program
661    doc/perltest.txt       plain text documentation of Perl test program    doc/perltest.txt        plain text documentation of Perl test program
662    install-sh             a shell script for installing files    install-sh              a shell script for installing files
663    libpcre.pc.in          template for libpcre.pc for pkg-config    libpcre.pc.in           template for libpcre.pc for pkg-config
664    libpcrecpp.pc.in       template for libpcrecpp.pc for pkg-config    libpcrecpp.pc.in        template for libpcrecpp.pc for pkg-config
665    ltmain.sh              file used to build a libtool script    ltmain.sh               file used to build a libtool script
666    missing                ) common stub for a few missing GNU programs while    missing                 ) common stub for a few missing GNU programs while
667                           )   installing, generated by automake                            )   installing, generated by automake
668    mkinstalldirs          script for making install directories    mkinstalldirs           script for making install directories
669    perltest.pl            Perl test program    perltest.pl             Perl test program
670    pcre-config.in         source of script which retains PCRE information    pcre-config.in          source of script which retains PCRE information
671    pcrecpp_unittest.cc          )    pcrecpp_unittest.cc          )
672    pcre_scanner_unittest.cc     ) test programs for the C++ wrapper    pcre_scanner_unittest.cc     ) test programs for the C++ wrapper
673    pcre_stringpiece_unittest.cc )    pcre_stringpiece_unittest.cc )
674    testdata/testinput*    test data for main library tests    testdata/testinput*     test data for main library tests
675    testdata/testoutput*   expected test results    testdata/testoutput*    expected test results
676    testdata/grep*         input and output for pcregrep tests    testdata/grep*          input and output for pcregrep tests
677    
678  (D) Auxiliary files for cmake support  (D) Auxiliary files for cmake support
679    
# Line 641  The distribution should contain the foll Line 689  The distribution should contain the foll
689    
690  (F) Auxiliary files for building PCRE "by hand"  (F) Auxiliary files for building PCRE "by hand"
691    
692    pcre.h.generic         ) a version of the public PCRE header file    pcre.h.generic          ) a version of the public PCRE header file
693                           )   for use in non-"configure" environments                            )   for use in non-"configure" environments
694    config.h.generic       ) a version of config.h for use in non-"configure"    config.h.generic        ) a version of config.h for use in non-"configure"
695                           )   environments                            )   environments
696    
697  (F) Miscellaneous  (F) Miscellaneous
698    
# Line 653  The distribution should contain the foll Line 701  The distribution should contain the foll
701  Philip Hazel  Philip Hazel
702  Email local part: ph10  Email local part: ph10
703  Email domain: cam.ac.uk  Email domain: cam.ac.uk
704  Last updated: March 2007  Last updated: 20 March 2007
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