| Name : perl-Syntax-Collector
| |
| Version : 0.006
| Vendor : obs://build_opensuse_org/devel:languages:perl
|
| Release : lp154.1.1
| Date : 2023-01-27 18:06:20
|
| Group : Development/Libraries/Perl
| Source RPM : perl-Syntax-Collector-0.006-lp154.1.1.src.rpm
|
| Size : 0.04 MB
| |
| Packager : https://www_suse_com/
| |
| Summary : collect a bundle of modules into one
|
Description :
Perl is such a flexible language that the language itself can be extended
from within. (Though much of the more interesting stuff needs XS hooks like
the Devel::Declare manpage.)
One problem with this is that it often requires a lot of declarations at
the top of your code, loading various syntax extensions. The the syntax
manpage module on CPAN addresses this somewhat by allowing you to load a
bunch of features in one line, provided each syntax feature implements the
necessary API:
use syntax qw/io maybe perform/;
However this introduces problems of its own. If we look at the code above,
it is non-obvious that it requires the Syntax::Feature::Io manpage, the
Syntax::Feature::Maybe manpage and the Syntax::Feature::Perform manpage,
which makes it difficult for automated tools such as the Module::Install
manpage to automatically calculate your code\'s dependencies.
Syntax::Collector to the rescue!
package Example::ProjectX::Syntax;
use 5.010;
use Syntax::Collector q/
use strict 0;
use warnings 0;
use feature 0 \':5.10\';
use Scalar::Util 1.21 qw(blessed);
/;
When you \'use Syntax::Collector\', you provide a list of modules to
\"collect\" into a single package (notice the \'q/.../\'). This list of modules
looks like a big string of Perl code that is going to be passed to \'eval\',
but don\'t let that fool you - it is not.
Each line must conform to the following pattern:
(use|no) MODULENAME VERSION (OTHERSTUFF)? ;
(Actually hash comments, and blank lines are also allowed.) The semantics
of all that is pretty much what you\'d expect, except that when MODULENAME
begins with \"Syntax::Feature::\" it\'s treated with some DWIMmery, and
\'install\' is called instead of \'import\'. Note that VERSION is required, but
if you don\'t care which version of a module you use, it\'s fine to set
VERSION to 0. (Yes, VERSION is even required for pragmata.)
Now, you ask... why stuff all that structured data into a string, and parse
it out again? Because to naive lexical analysis (e.g. the Module::Install
manpage) it really looks like a bunch of \"use\" lines, and not just a single
quoted string. This helps tools calculate the dependencies of your
collection; and thus the dependencies of other code that uses your
collection.
As well as providing an \'import\' method for your collection,
Syntax::Collector also provides a \'modules\' method, which can be called to
find out which modules a collection includes. Called in list context, it
returns a list. Called in scalar context, it returns a reference to a \'{
module => version }\' hash.
|
RPM found in directory: /packages/linux-pbone/ftp5.gwdg.de/pub/opensuse/repositories/devel:/languages:/perl:/CPAN-S/15.4/noarch |
