perl-B-Generate/perl-B-Generate.spec

#
# spec file for package perl-B-Generate
#
# Copyright (c) 2024 SUSE LLC
#
# All modifications and additions to the file contributed by third parties
# remain the property of their copyright owners, unless otherwise agreed
# upon. The license for this file, and modifications and additions to the
# file, is the same license as for the pristine package itself (unless the
# license for the pristine package is not an Open Source License, in which
# case the license is the MIT License). An "Open Source License" is a
# license that conforms to the Open Source Definition (Version 1.9)
# published by the Open Source Initiative.

# Please submit bugfixes or comments via https://bugs.opensuse.org/
#


%define cpan_name B-Generate
Name:           perl-B-Generate
Version:        1.560.0
Release:        0
# 1.56 -> normalize -> 1.560.0
%define cpan_version 1.56
#Upstream:  This module is available under the same licences as perl, the Artistic license and the GPL.
License:        Artistic-1.0 OR GPL-1.0-or-later
Summary:        Create your own op trees
URL:            https://metacpan.org/release/%{cpan_name}
Source0:        https://cpan.metacpan.org/authors/id/R/RU/RURBAN/%{cpan_name}-%{cpan_version}.tar.gz
Source1:        cpanspec.yml
Source100:      README.md
BuildRequires:  perl
BuildRequires:  perl-macros
BuildRequires:  perl(ExtUtils::CBuilder)
Requires:       perl(ExtUtils::CBuilder)
Provides:       perl(B::Generate) = %{version}
%undefine       __perllib_provides
%{perl_requires}

%description
The 'B' module allows you to examine the Perl op tree at runtime, in Perl
space; it's the basis of the Perl compiler. But what it doesn't let you do
is manipulate that op tree: it won't let you create new ops, or modify old
ones. Now you can.

Well, if you're intimately familiar with Perl's internals, you can.

'B::Generate' turns 'B''s accessor methods into get-set methods. Hence,
instead of merely saying

    $op2 = $op->next;

you can now say

    $op->next($op2);

to set the next op in the chain. It also adds constructor methods to create
new ops. This is where it gets really hairy.

    new B::OP     ( type, flags )
    new B::UNOP   ( type, flags, first )
    new B::BINOP  ( type, flags, first, last )
    new B::LOGOP  ( type, flags, first, other )
    new B::LISTOP ( type, flags, first, last )
    new B::SVOP   ( type, flags, sv )
    new B::COP    ( flags, name, first )

In all of the above constructors, 'type' is either a numeric value
representing the op type ('62' is the addition operator in certain perl
versions, for instance) or the name of the op. ('"add"')

Incidentally, if you know about custom ops and have registed them properly
with the interpreter, you can create custom ops by name: 'new
B::OP("mycustomop",0)', or whatever.

'first', 'last' and 'other' are ops to be attached to the current op; these
should be 'B::OP' objects. If you haven't created the ops yet, don't worry;
give a false value, and fill them in later:

    $x = new B::UNOP("negate", 0, undef);
    # ... create some more ops ...
    $x->first($y);

In addition, one may create a new 'nextstate' operator with

    newstate B::op ( flags, label, op)

in the same manner as 'B::COP::new' - this will also, however, add the
'lineseq' op.

Finally, you can set the main root and the starting op by passing ops to
the 'B::main_root' and 'B::main_start' functions.

This module can obviously be used for all sorts of fun and optimizational
purposes. One example will be in conjuction with source filters; have your
source filter parse an input file in a foreign language, create an op tree
for it and get Perl to execute it. Then email me and tell me how you did
it. And why.

%prep
%autosetup  -n %{cpan_name}-%{cpan_version}

%build
perl Makefile.PL INSTALLDIRS=vendor OPTIMIZE="%{optflags}"
%make_build

%check
make test

%install
%perl_make_install
%perl_process_packlist
%perl_gen_filelist

%files -f %{name}.files
%doc Changes README
%license Artistic Copying

%changelog