124 lines
4.6 KiB
RPMSpec
124 lines
4.6 KiB
RPMSpec
#
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# spec file for package perl-Switch
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#
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# Copyright (c) 2014 SUSE LINUX Products GmbH, Nuernberg, Germany.
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#
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# All modifications and additions to the file contributed by third parties
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# remain the property of their copyright owners, unless otherwise agreed
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# upon. The license for this file, and modifications and additions to the
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# file, is the same license as for the pristine package itself (unless the
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# license for the pristine package is not an Open Source License, in which
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# case the license is the MIT License). An "Open Source License" is a
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# license that conforms to the Open Source Definition (Version 1.9)
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# published by the Open Source Initiative.
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# Please submit bugfixes or comments via http://bugs.opensuse.org/
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#
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Name: perl-Switch
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Version: 2.17
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Release: 0
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%define cpan_name Switch
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Summary: A switch statement for Perl, do not use if you can use given/when
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License: Artistic-1.0 or GPL-1.0+
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Group: Development/Libraries/Perl
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Url: http://search.cpan.org/dist/Switch/
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Source: http://www.cpan.org/authors/id/C/CH/CHORNY/%{cpan_name}-%{version}.tar.gz
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BuildArch: noarch
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BuildRoot: %{_tmppath}/%{name}-%{version}-build
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BuildRequires: perl
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BuildRequires: perl-macros
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BuildRequires: perl(Text::Balanced) >= 2
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Requires: perl(Text::Balanced) >= 2
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%{perl_requires}
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%description
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The Switch.pm module implements a generalized case mechanism that covers
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most (but not all) of the numerous possible combinations of switch and case
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values described above.
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The module augments the standard Perl syntax with two new control
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statements: 'switch' and 'case'. The 'switch' statement takes a single
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scalar argument of any type, specified in parentheses. 'switch' stores this
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value as the current switch value in a (localized) control variable. The
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value is followed by a block which may contain one or more Perl statements
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(including the 'case' statement described below). The block is
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unconditionally executed once the switch value has been cached.
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A 'case' statement takes a single scalar argument (in mandatory parentheses
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if it's a variable; otherwise the parens are optional) and selects the
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appropriate type of matching between that argument and the current switch
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value. The type of matching used is determined by the respective types of
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the switch value and the 'case' argument, as specified in Table 1. If the
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match is successful, the mandatory block associated with the 'case'
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statement is executed.
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In most other respects, the 'case' statement is semantically identical to
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an 'if' statement. For example, it can be followed by an 'else' clause, and
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can be used as a postfix statement qualifier.
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However, when a 'case' block has been executed control is automatically
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transferred to the statement after the immediately enclosing 'switch'
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block, rather than to the next statement within the block. In other words,
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the success of any 'case' statement prevents other cases in the same scope
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from executing. But see the "Allowing fall-through" manpage below.
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Together these two new statements provide a fully generalized case
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mechanism:
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use Switch;
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# AND LATER...
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%special = ( woohoo => 1, d'oh => 1 );
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while (<>) {
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chomp;
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switch ($_) {
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case (%special) { print "homer\n"; } # if $special{$_}
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case /[a-z]/i { print "alpha\n"; } # if $_ =~ /a-z/i
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case [1..9] { print "small num\n"; } # if $_ in [1..9]
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case { $_[0] >= 10 } { print "big num\n"; } # if $_ >= 10
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print "must be punctuation\n" case /\W/; # if $_ ~= /\W/
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}
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}
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Note that 'switch'es can be nested within 'case' (or any other) blocks, and
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a series of 'case' statements can try different types of matches -- hash
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membership, pattern match, array intersection, simple equality, etc. --
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against the same switch value.
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The use of intersection tests against an array reference is particularly
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useful for aggregating integral cases:
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sub classify_digit
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{
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switch ($_[0]) { case 0 { return 'zero' }
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case [2,4,6,8] { return 'even' }
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case [1,3,5,7,9] { return 'odd' }
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case /[A-F]/i { return 'hex' }
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}
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}
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%prep
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%setup -q -n %{cpan_name}-%{version}
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%build
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%{__perl} Makefile.PL INSTALLDIRS=vendor
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%{__make} %{?_smp_mflags}
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%check
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%{__make} test
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%install
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%perl_make_install
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%perl_process_packlist
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%perl_gen_filelist
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%files -f %{name}.files
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%defattr(-,root,root,755)
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%doc Changes README
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%changelog
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