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An interesting variation on use is use if, which allows us to conditionally load a module based on arbitrary criteria. Since use happens at compile time, we must make sure to use constructs that are already defined at that time, such as special variables or environment variables. For example: use if $ENV{WARNINGS_ON},"warnings"; This will enable warnings in our code if the environment variable WARNINGS_ON is defined. Functional modules can also be loaded the same way: use if $ENV{USE_XML_PARSER},"XML::Parser"; use if !$ENV{USE_XML_PARSER},"XML::SAX"; The if pragma is, of course, implemented by the if.pm module and is a perfectly ordinary piece of Perl code. To do its magic, it defines an import that loads the specified module with require if the condition is met. From this we can deduce that it works with use, but not require, since that does not automatically invoke import. If we need to specify an import list, we can just tack it on to the end of the statement as usual. The following statement loads and imports a debug subroutine from My::Module::Debug if the program name (stored in $0) has the word debug in its name. If not, an empty debug subroutine is defined, which Perl will then optimize out of the code wherever it is used.

Exporting is nothing more than taking a copy of your SVN development tree and decoupling it from SVN. This means that the files will no longer be associated with a version in SVN. The practice is most commonly done when you are ready to release a version of your application.

The required classes are shown in Listing 3 4 and contain no additional functionality other than declaring themselves. Listing 3 4. Classes A D

use if $0=~/debug/ My::Module::Debug => qw(debug); *debug = sub { } unless *debug{CODE}; An unimport method is also defined so we can also say no if: use strict; no if $ENV{NO_STRICT_REFS} => strict => 'refs'; This switches on all strict modes, but then it switches off strict references (both at compile time) if the environment variable NO_STRICT_REFS has a true value.

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Quite separately from their usual usage, both the require and use directives support an alternative syntax, taking a numeric value as the first or only argument. When specified on its own, this value is compared to the version of Perl itself. It causes execution to halt if the comparison reveals that the version of Perl being used is less than that stated by the program. For instance, to require that only Perl version 5.6.0 or higher is used to run a script, we can write any of the following: require 5.6.0; use 5.6.0; require v5.6.0;

Older versions of Perl used a version resembling a floating-point number. This format is also supported, for compatibility with older versions of Perl: require 5.001; require 5.005_03; # require Perl 5.001 or higher # require Perl 5.005 patch level 3 or higher

SVN is a very powerful tool and can save both development time and unforeseen headaches when used correctly. It has many more features than I could cover in this article, including continuous integration (with tools such as CruiseControl), bug tracking integration (with Trac), and pre-Commit and postCommit hooks. You can read more about SVN and its features at http://subversion.tigris.org and http://tortoisesvn.tigris.org, and in the Advanced Subversion article in this collection ( 41). If you haven t started using SVN, I hope that this article has helped you decide to try it out.

Note that for patch levels (the final part of the version number), the leading zero is important. The underscore is just a way of separating the main version from the patch number and is a standard way to write numbers in Perl, not a special syntax. 5.005_03 is the same as 5.00503, but more legible. A version number may also be specified after a module name (and before the import list, if any is present), in which case it is compared to the version defined for the module. For example, to require CGI.pm version 2.36 or higher, we can write use CGI 2.36 qw(:standard); If the version of CGI.pm is less than 2.36, this will cause a compile-time error and abort the program. Note that there is no comma between the module name, the version, or the import list. As of Perl 5.8, a module that does not define a version at all will fail if a version number is requested. Prior to this, such modules would always load successfully. It probably comes as no surprise that, like the import mechanism, this is not built-in functionality. Requesting a version simply calls a subroutine called VERSION() to extract a numeric value for comparison. Unless we override it with a local definition, this subroutine is supplied by the UNIVERSAL module, from which all packages inherit. In turn, UNIVERSAL::VERSION() returns the value of the variable $PackageName::VERSION. This is how most modules define their version number.

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