IRIX Base Documentation 2002 November/SGI IRIX Base Documentation 2002 November.iso/usr/share/catman/p_man/cat3/perl5/AutoSplit.z/AutoSplit

Text File | 2002-10-03 | 5.5 KB | 199 lines

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     AutoSplit - split a package for autoloading

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      autosplit($file, $dir, $keep, $check, $modtime);

      autosplit_lib_modules(@modules);


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     This function will split up your program into files that the AutoLoader
     module can handle. It is used by both the standard perl libraries and by
     the MakeMaker utility, to automatically configure libraries for
     autoloading.

     The autosplit interface splits the specified file into a hierarchy rooted
     at the directory $dir. It creates directories as needed to reflect class
     hierarchy, and creates the file _a_u_t_o_s_p_l_i_t._i_x. This file acts as both
     forward declaration of all package routines, and as timestamp for the
     last update of the hierarchy.

     The remaining three arguments to autosplit govern other options to the
     autosplitter.

     $keep
       If the third argument, $_k_e_e_p, is false, then any pre-existing *.al
       files in the autoload directory are removed if they are no longer part
       of the module (obsoleted functions).  $keep defaults to 0.

     $check
       The fourth argument, $_c_h_e_c_k, instructs autosplit to check the module
       currently being split to ensure that it does include a use
       specification for the AutoLoader module, and skips the module if
       AutoLoader is not detected.  $check defaults to 1.

     $modtime
       Lastly, the $_m_o_d_t_i_m_e argument specifies that autosplit is to check the
       modification time of the module against that of the autosplit.ix file,
       and only split the module if it is newer.  $modtime defaults to 1.

     Typical use of AutoSplit in the perl MakeMaker utility is via the
     command-line with:

      perl -e 'use AutoSplit; autosplit($ARGV[0], $ARGV[1], 0, 1, 1)'

     Defined as a Make macro, it is invoked with file and directory arguments;
     autosplit will split the specified file into the specified directory and
     delete obsolete .al files, after checking first that the module does use
     the AutoLoader, and ensuring that the module is not already currently
     split in its current form (the modtime test).





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     The autosplit_lib_modules form is used in the building of perl. It takes
     as input a list of files (modules) that are assumed to reside in a
     directory lllliiiibbbb relative to the current directory. Each file is sent to the
     autosplitter one at a time, to be split into the directory lllliiiibbbb////aaaauuuuttttoooo.

     In both usages of the autosplitter, only subroutines defined following
     the perl ___E_N_D__ token are split out into separate files. Some routines
     may be placed prior to this marker to force their immediate loading and
     parsing.

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     As of version 1.01 of the AutoSplit module it is possible to have
     multiple packages within a single file. Both of the following cases are
     supported:

        package NAME;
        __END__
        sub AAA { ... }
        package NAME::option1;
        sub BBB { ... }
        package NAME::option2;
        sub BBB { ... }

        package NAME;
        __END__
        sub AAA { ... }
        sub NAME::option1::BBB { ... }
        sub NAME::option2::BBB { ... }


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     AutoSplit will inform the user if it is necessary to create the top-level
     directory specified in the invocation. It is preferred that the script or
     installation process that invokes AutoSplit have created the full
     directory path ahead of time. This warning may indicate that the module
     is being split into an incorrect path.

     AutoSplit will warn the user of all subroutines whose name causes
     potential file naming conflicts on machines with drastically limited (8
     characters or less) file name length. Since the subroutine name is used
     as the file name, these warnings can aid in portability to such systems.

     Warnings are issued and the file skipped if AutoSplit cannot locate
     either the ___E_N_D__ marker or a "package Name;"-style specification.

     AutoSplit will also emit general diagnostics for inability to create
     directories or files.







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